imgui

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 Go to latest Published: Jul 15, 2020 License: MIT, BSD-3-Clause Imports: 10 Imported by: 0

README

Dear ImGui for Go

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This library is a Go wrapper for Dear ImGui.

This wrapper started as a special-purpose wrapper for use within InkyBlackness. However, it is self-contained and can be used for other purposes as well.

This wrapper is

  • hand-crafted, for Go
  • documented
  • versioned
  • with ported examples in a separate repository (see below)

Screenshot from example

API naming

Names of types and functions follow closely those of Dear ImGui.

For functions that have optional parameters, the following schema is applied:

  • There is the "verbose" variant, followed by the letter V, such as ButtonV(id string, size Vec2) bool
  • Next to it there is the "idiomatic" variant, without any optional parameter, such as Button(id string) bool.
  • The idiomatic variant calls the verbose variant with the default values for the optional parameters. Functions that don't have optional parameters don't come in a verbose variant.

The Dear ImGui functions IO() and Style() have been renamed to be CurrentIO() and CurrentStyle(). This was done because their returned types have the same name, causing a name clash. With the Current prefix, they also better describe what they return.

API philosophy

This library does not intend to export all the functions of the wrapped Dear ImGui. The following filter applies as a rule of thumb:

  • Functions marked as "obsolete" are not available. (The corresponding C code isn't even compiled - disabled by define)
  • "Shortcut" Functions, which combine language features and/or other Dear ImGui functions, are not available. Prime example are the Text*() functions for instance: Text formatting should be done with fmt.Sprintf(), and style formatting with the corresponding Push/Pop functions.
  • Functions that are not needed by InkyBlackness are ignored. This doesn't mean that they can't be in the wrapper, they are simply not a priority. Feel free to propose an implementation or make a pull request, respecting the previous points :)

Version philosophy

This library does not mirror the versions of the wrapped Dear ImGui. The semantic versioning of this wrapper is defined as:

  • Major changes: (Breaking) changes in API or behaviour. Typically done through changes in Dear ImGui.
  • Minor changes: Extensions in API. Typically done through small version increments of Dear ImGui and/or exposing further features in a compatible way.
  • Patch changes: Bug fixes - either in the wrapper or the wrapped Dear ImGui, given that the API & behaviour remains the same.

At the moment, this library uses version 1.74 of Dear ImGui.

Examples

A separate repository was created to host ported examples and reference implementations. See repository inkyblackness/imgui-go-examples.

It contains reference implementations for libraries such as GLFW3 and SDL2, using OpenGL.

The screenshot above was created with such an example.

Extras

FreeType font rendering

If the FreeType library is available for your platform, you can enable using it with the build tag imguifreetype - as in

go build -tags="imguifreetype"

This extra is based on the reference implementation from Dear ImGui.

This allows you to use the function FontAtlas.BuildWithFreeType(). If the build tag is not set, this function will always return an error.

If you set the build tag, yet the corresponding support has not been added to the library, you will receive a build error. Contributions to support more build environments are happily accepted. See files FreeTypeEnabled*.go.

Alternatives

Before this project was created, the following alternatives were considered - and ignored:

  • kdrag0n/go-imgui (no longer available). Reasons for dismissal at time of decision:
    • Auto-generated bloat, which doesn't help
    • Was using old API (1.5x)
    • Did not compile
    • Project appeared to be abandoned
  • Extrawurst/cimgui. Reasons for dismissal at time of decision:
    • Was using old API (1.5x), 1.6x was attempted
    • Apparently semi-exposed the C++ API, especially through the structures
    • Adding this adds another dependency

License

The project is available under the terms of the New BSD License (see LICENSE file). The licenses of included sources are stored in the _licenses folder.

Documentation

Overview

Package imgui contains all the functions to create an immediate mode graphical user interface based on Dear ImGui.

Setup

For integration, please refer to the dedicated repository https://github.com/inkyblackness/imgui-go-examples , which contains ported examples of the C++ version, available to Go.

Conventions

The exported functions and constants are named closely to that of the wrapped library. If a function has optional parameters, it will be available in two versions: A verbose one, which has all optional parameters listed, and a terse one, with only the mandatory parameters in its signature. The verbose variant will have the suffix V in its name. For example, there are 

func Button(id string) bool

and 

func ButtonV(id string, size Vec2) bool

The terse variant will list the default parameters it uses to call the verbose variant.

There are several types which are based on uintptr. These are references to the wrapped instances in C++. You will always get to such a reference via some function - you never "instantiate" such an instance on your own.

Index

Constants

View Source 
const (
	// BackendFlagNone default = 0
	BackendFlagNone = 0
	// BackendFlagHasGamepad back-end Platform supports gamepad and currently has one connected.
	BackendFlagHasGamepad = 1 << 0
	// BackendFlagHasMouseCursors back-end Platform supports honoring GetMouseCursor() value to change the OS cursor
	// shape.
	BackendFlagHasMouseCursors = 1 << 1
	// BackendFlagHasSetMousePos back-end Platform supports io.WantSetMousePos requests to reposition the OS mouse
	// position (only used if ImGuiConfigFlags_NavEnableSetMousePos is set).
	BackendFlagHasSetMousePos = 1 << 2
	// BackendFlagsRendererHasVtxOffset back-end Renderer supports ImDrawCmd::VtxOffset. This enables output of large
	// meshes (64K+ vertices) while still using 16-bits indices.
	BackendFlagsRendererHasVtxOffset = 1 << 3
)
View Source 
const (
	// ColorEditFlagsNone default = 0
	ColorEditFlagsNone = 0
	// ColorEditFlagsNoAlpha ignores Alpha component (read 3 components from the input pointer).
	ColorEditFlagsNoAlpha = 1 << iota
	// ColorEditFlagsNoPicker disables picker when clicking on colored square.
	ColorEditFlagsNoPicker
	// ColorEditFlagsNoOptions disables toggling options menu when right-clicking on inputs/small preview.
	ColorEditFlagsNoOptions
	// ColorEditFlagsNoSmallPreview disables colored square preview next to the inputs. (e.g. to show only the inputs)
	ColorEditFlagsNoSmallPreview
	// ColorEditFlagsNoInputs disables inputs sliders/text widgets (e.g. to show only the small preview colored square).
	ColorEditFlagsNoInputs
	// ColorEditFlagsNoTooltip disables tooltip when hovering the preview.
	ColorEditFlagsNoTooltip
	// ColorEditFlagsNoLabel disables display of inline text label (the label is still forwarded to the tooltip and picker).
	ColorEditFlagsNoLabel
	// ColorEditFlagsNoDragDrop disables drag and drop target. ColorButton: disable drag and drop source.
	ColorEditFlagsNoDragDrop

	// ColorEditFlagsAlphaBar shows vertical alpha bar/gradient in picker.
	ColorEditFlagsAlphaBar = 1 << 16
	// ColorEditFlagsAlphaPreview displays preview as a transparent color over a checkerboard, instead of opaque.
	ColorEditFlagsAlphaPreview = 1 << 17
	// ColorEditFlagsAlphaPreviewHalf displays half opaque / half checkerboard, instead of opaque.
	ColorEditFlagsAlphaPreviewHalf = 1 << 18
	// ColorEditFlagsHDR = (WIP) surrently only disable 0.0f..1.0f limits in RGBA edition (note: you probably want to use ImGuiColorEditFlags_Float flag as well).
	ColorEditFlagsHDR = 1 << 19
	// ColorEditFlagsRGB sets the format as RGB
	ColorEditFlagsRGB = 1 << 20
	// ColorEditFlagsHSV sets the format as HSV
	ColorEditFlagsHSV = 1 << 21
	// ColorEditFlagsHEX sets the format as HEX
	ColorEditFlagsHEX = 1 << 22
	// ColorEditFlagsUint8 _display_ values formatted as 0..255.
	ColorEditFlagsUint8 = 1 << 23
	// ColorEditFlagsFloat _display_ values formatted as 0.0f..1.0f floats instead of 0..255 integers. No round-trip of value via integers.
	ColorEditFlagsFloat = 1 << 24
)
View Source 
const (
	// ColorPickerFlagsNone default = 0
	ColorPickerFlagsNone = 0
	// ColorPickerFlagsNoAlpha ignoreс Alpha component (read 3 components from the input pointer).
	ColorPickerFlagsNoAlpha = 1 << iota
	// ColorPickerFlagsNoSmallPreview disables colored square preview next to the inputs. (e.g. to show only the inputs)
	ColorPickerFlagsNoSmallPreview = 1 << 4
	// ColorPickerFlagsNoInputs disables inputs sliders/text widgets (e.g. to show only the small preview colored square).
	ColorPickerFlagsNoInputs = 1 << 5
	// ColorPickerFlagsNoTooltip disables tooltip when hovering the preview.
	ColorPickerFlagsNoTooltip = 1 << 6
	// ColorPickerFlagsNoLabel disables display of inline text label (the label is still forwarded to the tooltip and picker).
	ColorPickerFlagsNoLabel = 1 << 7
	// ColorPickerFlagsNoSidePreview disables bigger color preview on right side of the picker, use small colored square preview instead.
	ColorPickerFlagsNoSidePreview = 1 << 8

	// ColorPickerFlagsAlphaBar shows vertical alpha bar/gradient in picker.
	ColorPickerFlagsAlphaBar = 1 << 16
	// ColorPickerFlagsAlphaPreview displays preview as a transparent color over a checkerboard, instead of opaque.
	ColorPickerFlagsAlphaPreview = 1 << 17
	// ColorPickerFlagsAlphaPreviewHalf displays half opaque / half checkerboard, instead of opaque.
	ColorPickerFlagsAlphaPreviewHalf = 1 << 18
	// ColorPickerFlagsRGB sets the format as RGB
	ColorPickerFlagsRGB = 1 << 20
	// ColorPickerFlagsHSV sets the format as HSV
	ColorPickerFlagsHSV = 1 << 21
	// ColorPickerFlagsHEX sets the format as HEX
	ColorPickerFlagsHEX = 1 << 22
	// ColorPickerFlagsUint8 _display_ values formatted as 0..255.
	ColorPickerFlagsUint8 = 1 << 23
	// ColorPickerFlagsFloat _display_ values formatted as 0.0f..1.0f floats instead of 0..255 integers. No round-trip of value via integers.
	ColorPickerFlagsFloat = 1 << 24
	// ColorPickerFlagsPickerHueBar bar for Hue, rectangle for Sat/Value.
	ColorPickerFlagsPickerHueBar = 1 << 25
	// ColorPickerFlagsPickerHueWheel wheel for Hue, triangle for Sat/Value.
	ColorPickerFlagsPickerHueWheel = 1 << 26
)
View Source 
const (
	// ComboFlagNone default = 0
	ComboFlagNone = 0
	// ComboFlagPopupAlignLeft aligns the popup toward the left by default.
	ComboFlagPopupAlignLeft = 1 << 0
	// ComboFlagHeightSmall has max ~4 items visible.
	// Tip: If you want your combo popup to be a specific size you can use SetNextWindowSizeConstraints() prior to calling BeginCombo().
	ComboFlagHeightSmall = 1 << 1
	// ComboFlagHeightRegular has max ~8 items visible (default).
	ComboFlagHeightRegular = 1 << 2
	// ComboFlagHeightLarge has max ~20 items visible.
	ComboFlagHeightLarge = 1 << 3
	// ComboFlagHeightLargest has as many fitting items as possible.
	ComboFlagHeightLargest = 1 << 4
	// ComboFlagNoArrowButton displays on the preview box without the square arrow button.
	ComboFlagNoArrowButton = 1 << 5
	// ComboFlagNoPreview displays only a square arrow button.
	ComboFlagNoPreview = 1 << 6
)
View Source 
const (
	// ConditionAlways sets the variable.
	ConditionAlways Condition = 1 << 0
	// ConditionOnce sets the variable once per runtime session (only the first call with succeed).
	ConditionOnce = 1 << 1
	// ConditionFirstUseEver sets the variable if the object/window has no persistently saved data (no entry in .ini file).
	ConditionFirstUseEver = 1 << 2
	// ConditionAppearing sets the variable if the object/window is appearing after being hidden/inactive (or the first time).
	ConditionAppearing = 1 << 3
)
View Source 
const (
	// ConfigFlagNone default = 0
	ConfigFlagNone = 0
	// ConfigFlagNavEnableKeyboard master keyboard navigation enable flag. NewFrame() will automatically fill
	// io.NavInputs[] based on io.KeysDown[].
	ConfigFlagNavEnableKeyboard = 1 << 0
	// ConfigFlagNavEnableGamepad master gamepad navigation enable flag.
	// This is mostly to instruct your imgui back-end to fill io.NavInputs[]. Back-end also needs to set
	// BackendFlagHasGamepad.
	ConfigFlagNavEnableGamepad = 1 << 1
	// ConfigFlagNavEnableSetMousePos instruct navigation to move the mouse cursor. May be useful on TV/console systems
	// where moving a virtual mouse is awkward. Will update io.MousePos and set io.WantSetMousePos=true. If enabled you
	// MUST honor io.WantSetMousePos requests in your binding, otherwise ImGui will react as if the mouse is jumping
	// around back and forth.
	ConfigFlagNavEnableSetMousePos = 1 << 2
	// ConfigFlagNavNoCaptureKeyboard instruct navigation to not set the io.WantCaptureKeyboard flag when io.NavActive
	// is set.
	ConfigFlagNavNoCaptureKeyboard = 1 << 3
	// ConfigFlagNoMouse instruct imgui to clear mouse position/buttons in NewFrame(). This allows ignoring the mouse
	// information set by the back-end.
	ConfigFlagNoMouse = 1 << 4
	// ConfigFlagNoMouseCursorChange instruct back-end to not alter mouse cursor shape and visibility. Use if the
	// back-end cursor changes are interfering with yours and you don't want to use SetMouseCursor() to change mouse
	// cursor. You may want to honor requests from imgui by reading GetMouseCursor() yourself instead.
	ConfigFlagNoMouseCursorChange = 1 << 5

	ConfigFlagEnablePowerSavingMode = 1 << 6

	// ConfigFlagIsSRGB application is SRGB-aware.
	ConfigFlagIsSRGB = 1 << 20
	// ConfigFlagIsTouchScreen application is using a touch screen instead of a mouse.
	ConfigFlagIsTouchScreen = 1 << 21
)
View Source 
const (
	// FreeTypeRasterizerFlagsNoHinting disables hinting.
	// This generally generates 'blurrier' bitmap glyphs when the glyph are rendered in any of the anti-aliased modes.
	FreeTypeRasterizerFlagsNoHinting = 1 << 0
	// FreeTypeRasterizerFlagsNoAutoHint disables auto-hinter.
	FreeTypeRasterizerFlagsNoAutoHint = 1 << 1
	// FreeTypeRasterizerFlagsForceAutoHint indicates that the auto-hinter is preferred over the font's native hinter.
	FreeTypeRasterizerFlagsForceAutoHint = 1 << 2
	// FreeTypeRasterizerFlagsLightHinting is a lighter hinting algorithm for gray-level modes.
	// Many generated glyphs are fuzzier but better resemble their original shape.
	// This is achieved by snapping glyphs to the pixel grid only vertically (Y-axis),
	// as is done by Microsoft's ClearType and Adobe's proprietary font renderer.
	// This preserves inter-glyph spacing in horizontal text.
	FreeTypeRasterizerFlagsLightHinting = 1 << 3
	// FreeTypeRasterizerFlagsMonoHinting is a strong hinting algorithm that should only be used for monochrome output.
	FreeTypeRasterizerFlagsMonoHinting = 1 << 4
	// FreeTypeRasterizerFlagsBold is for styling: Should we artificially embolden the font?
	FreeTypeRasterizerFlagsBold = 1 << 5
	// FreeTypeRasterizerFlagsOblique is for styling: Should we slant the font, emulating italic style?
	FreeTypeRasterizerFlagsOblique = 1 << 6
	// FreeTypeRasterizerFlagsMonochrome disables anti-aliasing. Combine this with MonoHinting for best results!
	FreeTypeRasterizerFlagsMonochrome = 1 << 7
)

Flags for FreeType rasterizer. By default, hinting is enabled and the font's native hinter is preferred over the auto-hinter.

View Source 
const (
	// ErrFreeTypeNotAvailable is used if the implementation of freetype is not available in this build.
	ErrFreeTypeNotAvailable = FreeTypeError("Not available for this build")
	// ErrFreeTypeFailed is used if building a font atlas was not possible.
	ErrFreeTypeFailed = FreeTypeError("Failed to build FontAtlas with FreeType")
)
View Source 
const (
	// HoveredFlagsNone Return true if directly over the item/window, not obstructed by another window,
	// not obstructed by an active popup or modal blocking inputs under them.
	HoveredFlagsNone = 0
	// HoveredFlagsChildWindows IsWindowHovered() only: Return true if any children of the window is hovered.
	HoveredFlagsChildWindows = 1 << 0
	// HoveredFlagsRootWindow IsWindowHovered() only: Test from root window (top most parent of the current hierarchy).
	HoveredFlagsRootWindow = 1 << 1
	// HoveredFlagsAnyWindow IsWindowHovered() only: Return true if any window is hovered.
	HoveredFlagsAnyWindow = 1 << 2
	// HoveredFlagsAllowWhenBlockedByPopup Return true even if a popup window is normally blocking access to this item/window.
	HoveredFlagsAllowWhenBlockedByPopup = 1 << 3
	// HoveredFlagsAllowWhenBlockedByActiveItem Return true even if an active item is blocking access to this item/window.
	// Useful for Drag and Drop patterns.
	HoveredFlagsAllowWhenBlockedByActiveItem = 1 << 5
	// HoveredFlagsAllowWhenOverlapped Return true even if the position is overlapped by another window
	HoveredFlagsAllowWhenOverlapped = 1 << 6
	// HoveredFlagsAllowWhenDisabled Return true even if the item is disabled
	HoveredFlagsAllowWhenDisabled = 1 << 7
)
View Source 
const (
	HoveredFlagsRectOnly            = HoveredFlagsAllowWhenBlockedByPopup | HoveredFlagsAllowWhenBlockedByActiveItem | HoveredFlagsAllowWhenOverlapped
	HoveredFlagsRootAndChildWindows = HoveredFlagsRootWindow | HoveredFlagsChildWindows
)

HoveredFlags combinations

View Source 
const (
	// InputTextFlagsNone sets everything default.
	InputTextFlagsNone = 0
	// InputTextFlagsCharsDecimal allows 0123456789.+-
	InputTextFlagsCharsDecimal = 1 << 0
	// InputTextFlagsCharsHexadecimal allow 0123456789ABCDEFabcdef
	InputTextFlagsCharsHexadecimal = 1 << 1
	// InputTextFlagsCharsUppercase turns a..z into A..Z.
	InputTextFlagsCharsUppercase = 1 << 2
	// InputTextFlagsCharsNoBlank filters out spaces, tabs.
	InputTextFlagsCharsNoBlank = 1 << 3
	// InputTextFlagsAutoSelectAll selects entire text when first taking mouse focus.
	InputTextFlagsAutoSelectAll = 1 << 4
	// InputTextFlagsEnterReturnsTrue returns 'true' when Enter is pressed (as opposed to when the value was modified).
	InputTextFlagsEnterReturnsTrue = 1 << 5
	// InputTextFlagsCallbackCompletion for callback on pressing TAB (for completion handling).
	InputTextFlagsCallbackCompletion = 1 << 6
	// InputTextFlagsCallbackHistory for callback on pressing Up/Down arrows (for history handling).
	InputTextFlagsCallbackHistory = 1 << 7
	// InputTextFlagsCallbackAlways for callback on each iteration. User code may query cursor position, modify text buffer.
	InputTextFlagsCallbackAlways = 1 << 8
	// InputTextFlagsCallbackCharFilter for callback on character inputs to replace or discard them.
	// Modify 'EventChar' to replace or discard, or return 1 in callback to discard.
	InputTextFlagsCallbackCharFilter = 1 << 9
	// InputTextFlagsAllowTabInput when pressing TAB to input a '\t' character into the text field.
	InputTextFlagsAllowTabInput = 1 << 10
	// InputTextFlagsCtrlEnterForNewLine in multi-line mode, unfocus with Enter, add new line with Ctrl+Enter
	// (default is opposite: unfocus with Ctrl+Enter, add line with Enter).
	InputTextFlagsCtrlEnterForNewLine = 1 << 11
	// InputTextFlagsNoHorizontalScroll disables following the cursor horizontally.
	InputTextFlagsNoHorizontalScroll = 1 << 12
	// InputTextFlagsAlwaysInsertMode sets insert mode.
	InputTextFlagsAlwaysInsertMode = 1 << 13
	// InputTextFlagsReadOnly sets read-only mode.
	InputTextFlagsReadOnly = 1 << 14
	// InputTextFlagsPassword sets password mode, display all characters as '*'.
	InputTextFlagsPassword = 1 << 15
	// InputTextFlagsNoUndoRedo disables undo/redo. Note that input text owns the text data while active,
	// if you want to provide your own undo/redo stack you need e.g. to call ClearActiveID().
	InputTextFlagsNoUndoRedo = 1 << 16
	// InputTextFlagsCharsScientific allows 0123456789.+-*/eE (Scientific notation input).
	InputTextFlagsCharsScientific = 1 << 17
)
View Source 
const (
	KeyTab         = 0
	KeyLeftArrow   = 1
	KeyRightArrow  = 2
	KeyUpArrow     = 3
	KeyDownArrow   = 4
	KeyPageUp      = 5
	KeyPageDown    = 6
	KeyHome        = 7
	KeyEnd         = 8
	KeyInsert      = 9
	KeyDelete      = 10
	KeyBackspace   = 11
	KeySpace       = 12
	KeyEnter       = 13
	KeyEscape      = 14
	KeyKeyPadEnter = 15
	KeyA           = 16 // for text edit CTRL+A: select all
	KeyC           = 17 // for text edit CTRL+C: copy
	KeyV           = 18 // for text edit CTRL+V: paste
	KeyX           = 19 // for text edit CTRL+X: cut
	KeyY           = 20 // for text edit CTRL+Y: redo
	KeyZ           = 21 // for text edit CTRL+Z: undo
)

Constants to fill IO.KeyMap() lookup with indices into the IO.KeysDown[512] array. The mapped indices are then the ones reported to IO.KeyPress() and IO.KeyRelease().

View Source 
const (
	// MouseCursorNone no mouse cursor
	MouseCursorNone = -1
	// MouseCursorArrow standard arrow mouse cursor
	MouseCursorArrow = 0
	// MouseCursorTextInput when hovering over InputText, etc.
	MouseCursorTextInput = 1
	// MouseCursorResizeAll (Unused by imgui functions)
	MouseCursorResizeAll = 2
	// MouseCursorResizeNS when hovering over an horizontal border
	MouseCursorResizeNS = 3
	// MouseCursorResizeEW when hovering over a vertical border or a column
	MouseCursorResizeEW = 4
	// MouseCursorResizeNESW when hovering over the bottom-left corner of a window
	MouseCursorResizeNESW = 5
	// MouseCursorResizeNWSE when hovering over the bottom-right corner of a window
	MouseCursorResizeNWSE = 6
	// MouseCursorHand (Unused by imgui functions. Use for e.g. hyperlinks)
	MouseCursorHand  = 7
	MouseCursorCount = 8
)

Enumeration for MouseCursor() User code may request binding to display given cursor by calling SetMouseCursor(), which is why we have some cursors that are marked unused here

View Source 
const (
	// SelectableFlagsNone default = 0
	SelectableFlagsNone = 0
	// SelectableFlagsDontClosePopups makes clicking the selectable not close any parent popup windows.
	SelectableFlagsDontClosePopups = 1 << 0
	// SelectableFlagsSpanAllColumns allows the selectable frame to span all columns (text will still fit in current column).
	SelectableFlagsSpanAllColumns = 1 << 1
	// SelectableFlagsAllowDoubleClick generates press events on double clicks too.
	SelectableFlagsAllowDoubleClick = 1 << 2
	// SelectableFlagsDisabled disallows selection and displays text in a greyed out color.
	SelectableFlagsDisabled = 1 << 3
)
View Source 
const (
	// TabBarFlagsNone default = 0.
	TabBarFlagsNone = 0
	// TabBarFlagsReorderable Allow manually dragging tabs to re-order them + New tabs are appended at the end of list
	TabBarFlagsReorderable = 1 << 0
	// TabBarFlagsAutoSelectNewTabs Automatically select new tabs when they appear
	TabBarFlagsAutoSelectNewTabs = 1 << 1
	// TabBarFlagsTabListPopupButton Disable buttons to open the tab list popup
	TabBarFlagsTabListPopupButton = 1 << 2
	// TabBarFlagsNoCloseWithMiddleMouseButton Disable behavior of closing tabs (that are submitted with p_open != NULL)
	// with middle mouse button. You can still repro this behavior on user's side with if
	// (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
	TabBarFlagsNoCloseWithMiddleMouseButton = 1 << 3
	// TabBarFlagsNoTabListScrollingButtons Disable scrolling buttons (apply when fitting policy is
	// TabBarFlagsFittingPolicyScroll)
	TabBarFlagsNoTabListScrollingButtons = 1 << 4
	// TabBarFlagsNoTooltip Disable tooltips when hovering a tab
	TabBarFlagsNoTooltip = 1 << 5
	// TabBarFlagsFittingPolicyResizeDown Resize tabs when they don't fit
	TabBarFlagsFittingPolicyResizeDown = 1 << 6
	// TabBarFlagsFittingPolicyScroll Add scroll buttons when tabs don't fit
	TabBarFlagsFittingPolicyScroll = 1 << 7
	// TabBarFlagsFittingPolicyMask combines
	// TabBarFlagsFittingPolicyResizeDown and TabBarFlagsFittingPolicyScroll
	TabBarFlagsFittingPolicyMask = TabBarFlagsFittingPolicyResizeDown | TabBarFlagsFittingPolicyScroll
	// TabBarFlagsFittingPolicyDefault alias for TabBarFlagsFittingPolicyResizeDown
	TabBarFlagsFittingPolicyDefault = TabBarFlagsFittingPolicyResizeDown
)
View Source 
const (
	// TabItemFlagsNone default = 0
	TabItemFlagsNone = 0
	// TabItemFlagsUnsavedDocument Append '*' to title without affecting the ID, as a convenience to avoid using the
	// ### operator. Also: tab is selected on closure and closure is deferred by one frame to allow code to undo it
	// without flicker.
	TabItemFlagsUnsavedDocument = 1 << 0
	// TabItemFlagsSetSelected Trigger flag to programmatically make the tab selected when calling BeginTabItem()
	TabItemFlagsSetSelected = 1 << 1
	// TabItemFlagsNoCloseWithMiddleMouseButton  Disable behavior of closing tabs (that are submitted with
	// p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if
	// (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
	TabItemFlagsNoCloseWithMiddleMouseButton = 1 << 2
	// TabItemFlagsNoPushID Don't call PushID(tab->ID)/PopID() on BeginTabItem()/EndTabItem()
	TabItemFlagsNoPushID = 1 << 3
)
View Source 
const (
	// TreeNodeFlagsNone default = 0
	TreeNodeFlagsNone = 0
	// TreeNodeFlagsSelected draws as selected.
	TreeNodeFlagsSelected = 1 << 0
	// TreeNodeFlagsFramed draws full colored frame (e.g. for CollapsingHeader).
	TreeNodeFlagsFramed = 1 << 1
	// TreeNodeFlagsAllowItemOverlap hit testing to allow subsequent widgets to overlap this one.
	TreeNodeFlagsAllowItemOverlap = 1 << 2
	// TreeNodeFlagsNoTreePushOnOpen doesn't do a TreePush() when open
	// (e.g. for CollapsingHeader) = no extra indent nor pushing on ID stack.
	TreeNodeFlagsNoTreePushOnOpen = 1 << 3
	// TreeNodeFlagsNoAutoOpenOnLog doesn't automatically and temporarily open node when Logging is active
	// (by default logging will automatically open tree nodes).
	TreeNodeFlagsNoAutoOpenOnLog = 1 << 4
	// TreeNodeFlagsDefaultOpen defaults node to be open.
	TreeNodeFlagsDefaultOpen = 1 << 5
	// TreeNodeFlagsOpenOnDoubleClick needs double-click to open node.
	TreeNodeFlagsOpenOnDoubleClick = 1 << 6
	// TreeNodeFlagsOpenOnArrow opens only when clicking on the arrow part.
	// If TreeNodeFlagsOpenOnDoubleClick is also set, single-click arrow or double-click all box to open.
	TreeNodeFlagsOpenOnArrow = 1 << 7
	// TreeNodeFlagsLeaf allows no collapsing, no arrow (use as a convenience for leaf nodes).
	TreeNodeFlagsLeaf = 1 << 8
	// TreeNodeFlagsBullet displays a bullet instead of an arrow.
	TreeNodeFlagsBullet = 1 << 9
	// TreeNodeFlagsFramePadding uses FramePadding (even for an unframed text node) to
	// vertically align text baseline to regular widget height. Equivalent to calling AlignTextToFramePadding().
	TreeNodeFlagsFramePadding = 1 << 10
	// TreeNodeFlagsSpanAvailWidth extends hit box to the right-most edge, even if not framed.
	// This is not the default in order to allow adding other items on the same line.
	// In the future we may refactor the hit system to be front-to-back, allowing natural overlaps
	// and then this can become the default.
	TreeNodeFlagsSpanAvailWidth = 1 << 11
	// TreeNodeFlagsSpanFullWidth extends hit box to the left-most and right-most edges (bypass the indented area).
	TreeNodeFlagsSpanFullWidth = 1 << 12
	// TreeNodeFlagsNavLeftJumpsBackHere (WIP) Nav: left direction may move to this TreeNode() from any of its child
	// (items submitted between TreeNode and TreePop)
	TreeNodeFlagsNavLeftJumpsBackHere = 1 << 13
	// TreeNodeFlagsCollapsingHeader combines TreeNodeFlagsFramed and TreeNodeFlagsNoAutoOpenOnLog.
	TreeNodeFlagsCollapsingHeader = TreeNodeFlagsFramed | TreeNodeFlagsNoTreePushOnOpen | TreeNodeFlagsNoAutoOpenOnLog
)
View Source 
const (
	// WindowFlagsNone default = 0
	WindowFlagsNone = 0
	// WindowFlagsNoTitleBar disables title-bar.
	WindowFlagsNoTitleBar = 1 << 0
	// WindowFlagsNoResize disables user resizing with the lower-right grip.
	WindowFlagsNoResize = 1 << 1
	// WindowFlagsNoMove disables user moving the window.
	WindowFlagsNoMove = 1 << 2
	// WindowFlagsNoScrollbar disables scrollbars. Window can still scroll with mouse or programmatically.
	WindowFlagsNoScrollbar = 1 << 3
	// WindowFlagsNoScrollWithMouse disables user vertically scrolling with mouse wheel. On child window, mouse wheel
	// will be forwarded to the parent unless NoScrollbar is also set.
	WindowFlagsNoScrollWithMouse = 1 << 4
	// WindowFlagsNoCollapse disables user collapsing window by double-clicking on it.
	WindowFlagsNoCollapse = 1 << 5
	// WindowFlagsAlwaysAutoResize resizes every window to its content every frame.
	WindowFlagsAlwaysAutoResize = 1 << 6
	// WindowFlagsNoBackground disables drawing background color (WindowBg, etc.) and outside border. Similar as using
	// SetNextWindowBgAlpha(0.0f).
	WindowFlagsNoBackground = 1 << 7
	// WindowFlagsNoSavedSettings will never load/save settings in .ini file.
	WindowFlagsNoSavedSettings = 1 << 8
	// WindowFlagsNoMouseInputs disables catching mouse, hovering test with pass through.
	WindowFlagsNoMouseInputs = 1 << 9
	// WindowFlagsMenuBar has a menu-bar.
	WindowFlagsMenuBar = 1 << 10
	// WindowFlagsHorizontalScrollbar allows horizontal scrollbar to appear (off by default). You may use
	// SetNextWindowContentSize(ImVec2(width,0.0f)); prior to calling Begin() to specify width. Read code in imgui_demo
	// in the "Horizontal Scrolling" section.
	WindowFlagsHorizontalScrollbar = 1 << 11
	// WindowFlagsNoFocusOnAppearing disables taking focus when transitioning from hidden to visible state.
	WindowFlagsNoFocusOnAppearing = 1 << 12
	// WindowFlagsNoBringToFrontOnFocus disables bringing window to front when taking focus. e.g. clicking on it or
	// programmatically giving it focus.
	WindowFlagsNoBringToFrontOnFocus = 1 << 13
	// WindowFlagsAlwaysVerticalScrollbar always shows vertical scrollbar, even if ContentSize.y < Size.y .
	WindowFlagsAlwaysVerticalScrollbar = 1 << 14
	// WindowFlagsAlwaysHorizontalScrollbar always shows horizontal scrollbar, even if ContentSize.x < Size.x .
	WindowFlagsAlwaysHorizontalScrollbar = 1 << 15
	// WindowFlagsAlwaysUseWindowPadding ensures child windows without border uses style.WindowPadding (ignored by
	// default for non-bordered child windows, because more convenient).
	WindowFlagsAlwaysUseWindowPadding = 1 << 16
	// WindowFlagsNoNavInputs has no gamepad/keyboard navigation within the window.
	WindowFlagsNoNavInputs = 1 << 18
	// WindowFlagsNoNavFocus has no focusing toward this window with gamepad/keyboard navigation
	// (e.g. skipped by CTRL+TAB)
	WindowFlagsNoNavFocus = 1 << 19
	// WindowFlagsUnsavedDocument appends '*' to title without affecting the ID, as a convenience to avoid using the
	// ### operator. When used in a tab/docking context, tab is selected on closure and closure is deferred by one
	// frame to allow code to cancel the closure (with a confirmation popup, etc.) without flicker.
	WindowFlagsUnsavedDocument = 1 << 20

	// WindowFlagsNoNav combines WindowFlagsNoNavInputs and WindowFlagsNoNavFocus.
	WindowFlagsNoNav = WindowFlagsNoNavInputs | WindowFlagsNoNavFocus
	// WindowFlagsNoDecoration combines WindowFlagsNoTitleBar, WindowFlagsNoResize, WindowFlagsNoScrollbar and
	// WindowFlagsNoCollapse.
	WindowFlagsNoDecoration = WindowFlagsNoTitleBar | WindowFlagsNoResize | WindowFlagsNoScrollbar | WindowFlagsNoCollapse
	// WindowFlagsNoInputs combines WindowFlagsNoMouseInputs, WindowFlagsNoNavInputs and WindowFlagsNoNavFocus.
	WindowFlagsNoInputs = WindowFlagsNoMouseInputs | WindowFlagsNoNavInputs | WindowFlagsNoNavFocus
)

Variables

View Source 
var (
	DPIScale float32
)
View Source 
var (
	EnableFreeType = false
)
View Source 
var ErrContextDestroyed = errors.New("context is destroyed")

ErrContextDestroyed is returned when trying to use an already destroyed context.

View Source 
var ErrNoContext = errors.New("no current context")

ErrNoContext is used when no context is current.

Functions

func AlignTextToFramePadding 

func AlignTextToFramePadding()

AlignTextToFramePadding vertically aligns upcoming text baseline to FramePadding.y so that it will align properly to regularly framed items. Call if you have text on a line before a framed item.

func Begin 

func Begin(id string) bool

Begin calls BeginV(id, nil, 0).

func BeginChild 

func BeginChild(id string) bool

BeginChild calls BeginChildV(id, Vec2{0,0}, false, 0).

func BeginChildV 

func BeginChildV(id string, size Vec2, border bool, flags int) bool

BeginChildV pushes a new child to the stack and starts appending to it. flags are the WindowFlags to apply.

func BeginCombo 

func BeginCombo(label, previewValue string) bool

BeginCombo calls BeginComboV(label, previewValue, 0).

func BeginComboV 

func BeginComboV(label, previewValue string, flags int) bool

BeginComboV creates a combo box with complete control over the content to the user. Call EndCombo() if this function returns true. flags are the ComboFlags to apply.

func BeginDragDropSource 

func BeginDragDropSource() bool

func BeginDragDropSourceV 

func BeginDragDropSourceV(flags int) bool

func BeginDragDropTarget 

func BeginDragDropTarget() bool

func BeginGroup 

func BeginGroup()

BeginGroup locks horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)

func BeginMainMenuBar 

func BeginMainMenuBar() bool

BeginMainMenuBar creates and appends to a full screen menu-bar. If the return value is true, then EndMainMenuBar() must be called!

func BeginMenu 

func BeginMenu(label string) bool

BeginMenu calls BeginMenuV(label, true).

func BeginMenuBar 

func BeginMenuBar() bool

BeginMenuBar appends to menu-bar of current window. This requires WindowFlagsMenuBar flag set on parent window. If the return value is true, then EndMenuBar() must be called!

func BeginMenuV 

func BeginMenuV(label string, enabled bool) bool

BeginMenuV creates a sub-menu entry. If the return value is true, then EndMenu() must be called!

func BeginPopupContextItem 

func BeginPopupContextItem() bool

BeginPopupContextItem calls BeginPopupContextItemV("", 1)

func BeginPopupContextItemV 

func BeginPopupContextItemV(label string, mouseButton int) bool

BeginPopupContextItemV returns true if the identified mouse button was pressed while hovering over the last item.

func BeginPopupModal 

func BeginPopupModal(name string) bool

BeginPopupModal calls BeginPopupModalV(name, nil, 0)

func BeginPopupModalV 

func BeginPopupModalV(name string, open *bool, flags int) bool

BeginPopupModalV creates modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside).

func BeginTabBar 

func BeginTabBar(strID string) bool

BeginTabBar calls BeginTabBarV(strId, 0)

func BeginTabBarV 

func BeginTabBarV(strID string, flags int) bool

BeginTabBarV create and append into a TabBar

func BeginTabItem 

func BeginTabItem(label string) bool

BeginTabItem calls BeginTabItemV(label, nil, 0)

func BeginTabItemV 

func BeginTabItemV(label string, open *bool, flags int) bool

BeginTabItemV create a Tab. Returns true if the Tab is selected.

func BeginTooltip 

func BeginTooltip()

BeginTooltip begins/appends to a tooltip window. Used to create full-featured tooltip (with any kind of contents). Requires a call to EndTooltip().

func BeginV 

func BeginV(id string, open *bool, flags int) bool

BeginV pushes a new window to the stack and start appending to it. You may append multiple times to the same window during the same frame. If the open argument is provided, the window can be closed, in which case the value will be false after the call.

Returns false if the window is currently not visible. Regardless of the return value, End() must be called for each call to Begin().

func Button 

func Button(id string) bool

Button calls ButtonV(id, Vec2{0,0}).

func ButtonV 

func ButtonV(id string, size Vec2) bool

ButtonV returning true if it is pressed.

func CalcItemWidth 

func CalcItemWidth() float32

CalcItemWidth returns the width of items given pushed settings and current cursor position.

func Checkbox 

func Checkbox(id string, selected *bool) bool

Checkbox creates a checkbox in the selected state. The return value indicates if the selected state has changed.

func CloseCurrentPopup 

func CloseCurrentPopup()

CloseCurrentPopup closes the popup we have begin-ed into. Clicking on a MenuItem or Selectable automatically close the current popup.

func ColorEdit3 

func ColorEdit3(label string, col *[3]float32) bool

ColorEdit3 calls ColorEdit3V(label, col, 0)

func ColorEdit3V 

func ColorEdit3V(label string, col *[3]float32, flags int) bool

ColorEdit3V will show a clickable little square which will open a color picker window for 3D vector (rgb format).

func ColorEdit4 

func ColorEdit4(label string, col *[4]float32) bool

ColorEdit4 calls ColorEdit4V(label, col, 0)

func ColorEdit4V 

func ColorEdit4V(label string, col *[4]float32, flags int) bool

ColorEdit4V will show a clickable little square which will open a color picker window for 4D vector (rgba format).

func ColorPicker3 

func ColorPicker3(label string, col *[3]float32, flags int) bool

ColorPicker3 calls ColorPicker3(label, col, 0)

func ColorPicker3V 

func ColorPicker3V(label string, col *[3]float32, flags int) bool

ColorPicker3V will show directly a color picker control for editing a color in 3D vector (rgb format).

func ColorPicker4 

func ColorPicker4(label string, col *[4]float32) bool

ColorPicker4 calls ColorPicker4(label, col, 0)

func ColorPicker4V 

func ColorPicker4V(label string, col *[4]float32, flags int) bool

ColorPicker4V will show directly a color picker control for editing a color in 4D vector (rgba format).

func ColumnIndex 

func ColumnIndex() int

ColumnIndex get current column index.

func ColumnOffset 

func ColumnOffset() float32

ColumnOffset calls ColumnOffsetV(-1)

func ColumnOffsetV 

func ColumnOffsetV(index int) float32

ColumnOffsetV get position of column line (in pixels, from the left side of the contents region). pass -1 to use current column, otherwise 0..GetColumnsCount() inclusive. column 0 is typically 0.0.

func ColumnWidth 

func ColumnWidth() int

ColumnWidth calls ColumnWidthV(-1).

func ColumnWidthV 

func ColumnWidthV(index int) int

ColumnWidthV get column width (in pixels). pass -1 to use current column.

func Columns 

func Columns()

Columns calls ColumnsV(1, "", false).

func ColumnsCount 

func ColumnsCount() int

ColumnsCount returns number of current columns.

func ColumnsV 

func ColumnsV(count int, label string, border bool)

ColumnsV creates a column layout of the specified number of columns. The brittle columns API will be superseded by an upcoming 'table' API.

func CursorPosX 

func CursorPosX() float32

CursorPosX returns the x-coordinate of the cursor position in window coordinates.

func CursorPosY 

func CursorPosY() float32

CursorPosY returns the y-coordinate of the cursor position in window coordinates.

func DragFloat 

func DragFloat(label string, value *float32) bool

DragFloat calls DragFloatV(label, value, 1.0, 0.0, 0.0, "%.3f", 1.0).

func DragFloatV 

func DragFloatV(label string, value *float32, speed, min, max float32, format string, power float32) bool

DragFloatV creates a draggable slider for floats.

func DragInt 

func DragInt(label string, value *int32) bool

DragInt calls DragIntV(label, value, 1.0, 0, 0, "%d").

func DragIntV 

func DragIntV(label string, value *int32, speed float32, min, max int32, format string) bool

DragIntV creates a draggable slider for integers.

func Dummy 

func Dummy(size Vec2)

Dummy adds a dummy item of given size.

func End 

func End()

End closes the scope for the previously opened window. Every call to Begin() must be matched with a call to End().

func EndChild 

func EndChild()

EndChild closes the scope for the previously opened child. Every call to BeginChild() must be matched with a call to EndChild().

func EndCombo 

func EndCombo()

EndCombo must be called if BeginComboV() returned true.

func EndDragDropSource 

func EndDragDropSource()

func EndDragDropTarget 

func EndDragDropTarget()

func EndFrame 

func EndFrame()

EndFrame ends the ImGui frame. Automatically called by Render(), so most likely don't need to ever call that yourself directly. If you don't need to render you may call EndFrame() but you'll have wasted CPU already. If you don't need to render, better to not create any imgui windows instead!

func EndGroup 

func EndGroup()

EndGroup must be called for each call to BeginGroup().

func EndMainMenuBar 

func EndMainMenuBar()

EndMainMenuBar finishes a main menu bar. Only call EndMainMenuBar() if BeginMainMenuBar() returns true!

func EndMenu 

func EndMenu()

EndMenu finishes a sub-menu entry. Only call EndMenu() if BeginMenu() returns true!

func EndMenuBar 

func EndMenuBar()

EndMenuBar finishes a menu bar. Only call EndMenuBar() if BeginMenuBar() returns true!

func EndPopup 

func EndPopup()

EndPopup finshes a popup. Only call EndPopup() if BeginPopupXXX() returns true!

func EndTabBar 

func EndTabBar()

EndTabBar only call EndTabBar() if BeginTabBar() returns true!

func EndTabItem 

func EndTabItem()

EndTabItem Don't call PushID(tab->ID)/PopID() on BeginTabItem()/EndTabItem()

func EndTooltip 

func EndTooltip()

EndTooltip closes the previously started tooltip window.

func FontSize 

func FontSize() float32

FontSize returns the current font size (= height in pixels) of the current font with the current scale applied.

func GetColorU32 

func GetColorU32(col Vec4) uint

Get ColorU32 from Vec4

func GetEventWaitingTime 

func GetEventWaitingTime() float64

func Image 

func Image(id TextureID, size Vec2)

Image calls ImageV(id, size, Vec2{0,0}, Vec2{1,1}, Vec4{1,1,1,1}, Vec4{0,0,0,0}).

func ImageButton 

func ImageButton(id TextureID, size Vec2) bool

ImageButton calls ImageButtonV(id, size, Vec2{0,0}, Vec2{1,1}, -1, Vec4{0,0,0,0}, Vec4{1,1,1,1}).

func ImageButtonV 

func ImageButtonV(id TextureID, size Vec2, uv0, uv1 Vec2, framePadding int, bgCol Vec4, tintCol Vec4) bool

ImageButtonV adds a button with an image, based on given texture ID. Refer to TextureID what this represents and how it is drawn. <0 framePadding uses default frame padding settings. 0 for no padding.

func ImageV 

func ImageV(id TextureID, size Vec2, uv0, uv1 Vec2, tintCol, borderCol Vec4)

ImageV adds an image based on given texture ID. Refer to TextureID what this represents and how it is drawn.

func IndexBufferLayout 

func IndexBufferLayout() (entrySize int)

IndexBufferLayout returns the byte size necessary to select fields in an index buffer of DrawList.

func InputFloat 

func InputFloat(label string, value *float32) bool

func InputFloatV 

func InputFloatV(label string, value *float32, step, step_fast float32, format string, flags int) bool

func InputInt 

func InputInt(label string, value *int32) bool

func InputIntV 

func InputIntV(label string, value *int32, step, step_fast int, flags int) bool

func InputText 

func InputText(label string, text *string) bool

InputText calls InputTextV(label, string, 0, nil)

func InputTextMultiline 

func InputTextMultiline(label string, text *string) bool

InputTextMultiline calls InputTextMultilineV(label, text, Vec2{0,0}, 0, nil)

func InputTextMultilineV 

func InputTextMultilineV(label string, text *string, size Vec2, flags int, cb InputTextCallback) bool

InputTextMultilineV provides a field for dynamic text input of multiple lines.

Contrary to the original library, this wrapper does not limit the maximum number of possible characters. Dynamic resizing of the internal buffer is handled within the wrapper and the user will never be called for such requests.

The provided callback is called for any of the requested InputTextFlagsCallback* flags.

To implement a character limit, provide a callback that drops input characters when the requested length has been reached.

func InputTextV 

func InputTextV(label string, text *string, flags int, cb InputTextCallback) bool

InputTextV creates a text field for dynamic text input.

Contrary to the original library, this wrapper does not limit the maximum number of possible characters. Dynamic resizing of the internal buffer is handled within the wrapper and the user will never be called for such requests.

The provided callback is called for any of the requested InputTextFlagsCallback* flags.

To implement a character limit, provide a callback that drops input characters when the requested length has been reached.

func InvisibleButton 

func InvisibleButton(id string, size Vec2) bool

func IsAnyItemActive 

func IsAnyItemActive() bool

IsAnyItemActive returns true if the any item is active.

func IsAnyItemFocused 

func IsAnyItemFocused() bool

IsAnyItemFocused returns true if any item is focused.

func IsAnyMouseDown 

func IsAnyMouseDown() bool

IsAnyMouseDown returns true if any mouse button is currently being held down.

func IsItemActive 

func IsItemActive() bool

func IsItemFocused 

func IsItemFocused() bool

IsItemFocused returns true if the last item is focused.

func IsItemHovered 

func IsItemHovered() bool

IsItemHovered calls IsItemHoveredV(HoveredFlagsNone)

func IsItemHoveredV 

func IsItemHoveredV(flags int) bool

IsItemHoveredV returns true if the last item is hovered. (and usable, aka not blocked by a popup, etc.). See HoveredFlags for more options.

func IsKeyDown 

func IsKeyDown(key int) bool

IsKeyDown returns true if the corresponding key is currently being held down.

func IsKeyPressed 

func IsKeyPressed(key int) bool

IsKeyPressed calls IsKeyPressedV(key, true).

func IsKeyPressedV 

func IsKeyPressedV(key int, repeat bool) bool

IsKeyPressedV returns true if the corresponding key was pressed (went from !Down to Down). If repeat=true and the key is being held down then the press is repeated using io.KeyRepeatDelay and KeyRepeatRate

func IsKeyReleased 

func IsKeyReleased(key int) bool

IsKeyReleased returns true if the corresponding key was released (went from Down to !Down).

func IsMouseClicked 

func IsMouseClicked(button int) bool

IsMouseClicked calls IsMouseClickedV(key, false).

func IsMouseClickedV 

func IsMouseClickedV(button int, repeat bool) bool

IsMouseClickedV returns true if the mouse button was clicked (0=left, 1=right, 2=middle) If repeat=true and the mouse button is being held down then the click is repeated using io.KeyRepeatDelay and KeyRepeatRate

func IsMouseDoubleClicked 

func IsMouseDoubleClicked(button int) bool

IsMouseDoubleClicked returns true if the mouse button was double-clicked (0=left, 1=right, 2=middle).

func IsMouseDown 

func IsMouseDown(button int) bool

IsMouseDown returns true if the corresponding mouse button is currently being held down.

func IsMouseReleased 

func IsMouseReleased(button int) bool

IsMouseReleased returns true if the mouse button was released (went from Down to !Down).

func IsWindowAppearing 

func IsWindowAppearing() bool

func LabelText 

func LabelText(label, text string)

LabelText adds text+label aligned the same way as value+label widgets.

func ListBox 

func ListBox(label string, currentItem *int32, items []string) bool

ListBox calls ListBoxV(label, currentItem, items, -1) The function returns true if the selection was changed. The value of currentItem will indicate the new selected item.

func ListBoxV 

func ListBoxV(label string, currentItem *int32, items []string, heightItems int) bool

ListBoxV creates a list of selectables of given items with equal height, enclosed with header and footer. This version accepts a custom item height. The function returns true if the selection was changed. The value of currentItem will indicate the new selected item. 

func MenuItem(label string) bool

MenuItem calls MenuItemV(label, "", false, true). 

func MenuItemV(label string, shortcut string, selected bool, enabled bool) bool

MenuItemV adds a menu item with given label. Returns true if the item is selected. If selected is not nil, it will be toggled when true is returned. Shortcuts are displayed for convenience but not processed by ImGui at the moment.

func MouseCursor 

func MouseCursor() int

MouseCursor returns desired cursor type, reset in imgui.NewFrame(), this is updated during the frame. Valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you.

func NewFrame 

func NewFrame()

NewFrame starts a new ImGui frame, you can submit any command from this point until Render()/EndFrame().

func NextColumn 

func NextColumn()

NextColumn next column, defaults to current row or next row if the current row is finished.

func OpenPopup 

func OpenPopup(id string)

OpenPopup marks popup as open (don't call every frame!). Popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).

func PlotHistogram 

func PlotHistogram(label string, values []float32)

PlotHistogram draws an array of floats as a bar graph. It calls PlotHistogramV using no overlay text and automatically calculated scale and graph size.

func PlotHistogramV 

func PlotHistogramV(label string, values []float32, valuesOffset int, overlayText string, scaleMin float32, scaleMax float32, graphSize Vec2)

PlotHistogramV draws an array of floats as a bar graph with additional options. valuesOffset specifies an offset into the values array at which to start drawing, wrapping around when the end of the values array is reached. overlayText specifies a string to print on top of the graph. scaleMin and scaleMax define the scale of the y axis, if either is math.MaxFloat32 that value is calculated from the input data. graphSize defines the size of the graph, if either coordinate is zero the default size for that direction is used.

func PlotLines 

func PlotLines(label string, values []float32)

PlotLines draws an array of floats as a line graph. It calls PlotLinesV using no overlay text and automatically calculated scale and graph size.

func PlotLinesV 

func PlotLinesV(label string, values []float32, valuesOffset int, overlayText string, scaleMin float32, scaleMax float32, graphSize Vec2)

PlotLinesV draws an array of floats as a line graph with additional options. valuesOffset specifies an offset into the values array at which to start drawing, wrapping around when the end of the values array is reached. overlayText specifies a string to print on top of the graph. scaleMin and scaleMax define the scale of the y axis, if either is math.MaxFloat32 that value is calculated from the input data. graphSize defines the size of the graph, if either coordinate is zero the default size for that direction is used.

func PopFont 

func PopFont()

PopFont removes the previously pushed font from the stack.

func PopID 

func PopID()

PopID removes the last pushed identifier from the ID stack.

func PopItemWidth 

func PopItemWidth()

PopItemWidth must be called for each call to PushItemWidth().

func PopStyleColor 

func PopStyleColor()

PopStyleColor calls PopStyleColorV(1).

func PopStyleColorV 

func PopStyleColorV(count int)

PopStyleColorV reverts the given amount of style color changes.

func PopStyleVar 

func PopStyleVar()

PopStyleVar calls PopStyleVarV(1).

func PopStyleVarV 

func PopStyleVarV(count int)

PopStyleVarV reverts the given amount of style variable changes.

func PopTextWrapPos 

func PopTextWrapPos()

PopTextWrapPos resets the last pushed position.

func ProgressBar 

func ProgressBar(fraction float32)

ProgressBar calls ProgressBarV(fraction, Vec2{X: -1, Y: 0}, "").

func ProgressBarV 

func ProgressBarV(fraction float32, size Vec2, overlay string)

ProgressBarV creates a progress bar. size (for each axis) < 0.0f: align to end, 0.0f: auto, > 0.0f: specified size

func PushFont 

func PushFont(font Font)

PushFont adds the given font on the stack. Use DefaultFont to refer to the default font.

func PushID 

func PushID(id string)

PushID pushes the given identifier into the ID stack. IDs are hash of the entire stack!

func PushItemWidth 

func PushItemWidth(width float32)

PushItemWidth sets width of items for the common item+label case, in pixels. 0.0f = default to ~2/3 of windows width, >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side).

func PushStyleColor 

func PushStyleColor(id StyleColorID, color Vec4)

PushStyleColor pushes the current style color for given ID on a stack and sets the given one. To revert to the previous color, call PopStyleColor().

func PushStyleVarFloat 

func PushStyleVarFloat(id StyleVarID, value float32)

PushStyleVarFloat pushes a float value on the stack to temporarily modify a style variable.

func PushStyleVarVec2 

func PushStyleVarVec2(id StyleVarID, value Vec2)

PushStyleVarVec2 pushes a Vec2 value on the stack to temporarily modify a style variable.

func PushTextWrapPos 

func PushTextWrapPos()

PushTextWrapPos calls PushTextWrapPosV(0.0).

func PushTextWrapPosV 

func PushTextWrapPosV(wrapPosX float32)

PushTextWrapPosV defines word-wrapping for Text() commands. < 0.0f: no wrapping; 0.0f: wrap to end of window (or column); > 0.0f: wrap at 'wrapPosX' position in window local space. Requires a matching call to PopTextWrapPos().

func RadioButton 

func RadioButton(label string, active bool) bool

func Render 

func Render()

Render ends the ImGui frame, finalize the draw data. After this method, call RenderedDrawData to retrieve the draw commands and execute them.

func SameLine 

func SameLine()

SameLine calls SameLineV(0, -1).

func SameLineV 

func SameLineV(posX float32, spacingW float32)

SameLineV is between widgets or groups to layout them horizontally.

func Selectable 

func Selectable(label string) bool

Selectable calls SelectableV(label, false, 0, Vec2{0, 0})

func SelectableV 

func SelectableV(label string, selected bool, flags int, size Vec2) bool

SelectableV returns true if the user clicked it, so you can modify your selection state. flags are the SelectableFlags to apply. size.x==0.0: use remaining width, size.x>0.0: specify width. size.y==0.0: use label height, size.y>0.0: specify height

func Separator 

func Separator()

Separator is generally horizontal. Inside a menu bar or in horizontal layout mode, this becomes a vertical separator.

func SetAssertHandler 

func SetAssertHandler(handler AssertHandler)

SetAssertHandler registers a handler function for all future assertions. Setting nil will disable special handling. The default handler panics.

func SetColumnOffset 

func SetColumnOffset(index int, offsetX float32)

SetColumnOffset set position of column line (in pixels, from the left side of the contents region). pass -1 to use current column.

func SetColumnWidth 

func SetColumnWidth(index int, width float32)

SetColumnWidth sets column width (in pixels). pass -1 to use current column.

func SetCursorPos 

func SetCursorPos(localPos Vec2)

SetCursorPos sets the cursor relative to the current window.

func SetCursorScreenPos 

func SetCursorScreenPos(absPos Vec2)

SetCursorScreenPos sets the cursor position in absolute screen coordinates.

func SetDragDropPayload 

func SetDragDropPayload(payloadType string, data int) bool

func SetDragDropPayloadV 

func SetDragDropPayloadV(payloadType string, data int, cond int) bool

func SetItemDefaultFocus 

func SetItemDefaultFocus()

SetItemDefaultFocus makes the last item the default focused item of a window.

func SetKeyboardFocusHere 

func SetKeyboardFocusHere()

SetKeyboardFocusHere calls SetKeyboardFocusHereV(0)

func SetKeyboardFocusHereV 

func SetKeyboardFocusHereV(offset int)

SetKeyboardFocusHereV gives keyboard focus to next item

func SetMaxWaitBeforeNextFrame 

func SetMaxWaitBeforeNextFrame(time float32)

func SetMouseCursor 

func SetMouseCursor(cursor int)

SetMouseCursor sets desired cursor type.

func SetNextItemOpen 

func SetNextItemOpen(open bool, cond Condition)

SetNextItemOpen sets the open/collapsed state of the following tree node.

func SetNextWindowBgAlpha 

func SetNextWindowBgAlpha(value float32)

SetNextWindowBgAlpha sets next window background color alpha. Helper to easily modify ImGuiCol_WindowBg/ChildBg/PopupBg.

func SetNextWindowContentSize 

func SetNextWindowContentSize(size Vec2)

SetNextWindowContentSize sets next window content size (~ enforce the range of scrollbars). Does not include window decorations (title bar, menu bar, etc.). Set one axis to 0.0 to leave it automatic. This function must be called before Begin() to take effect.

func SetNextWindowFocus 

func SetNextWindowFocus()

SetNextWindowFocus sets next window to be focused / front-most. Call before Begin().

func SetNextWindowPos 

func SetNextWindowPos(pos Vec2)

SetNextWindowPos calls SetNextWindowPosV(pos, 0, Vec{0,0})

func SetNextWindowPosV 

func SetNextWindowPosV(pos Vec2, cond Condition, pivot Vec2)

SetNextWindowPosV sets next window position. Call before Begin(). Use pivot=(0.5,0.5) to center on given point, etc.

func SetNextWindowSize 

func SetNextWindowSize(size Vec2)

SetNextWindowSize calls SetNextWindowSizeV(size, 0)

func SetNextWindowSizeV 

func SetNextWindowSizeV(size Vec2, cond Condition)

SetNextWindowSizeV sets next window size. Set axis to 0.0 to force an auto-fit on this axis. Call before Begin().

func SetScrollHereY 

func SetScrollHereY(ratio float32)

SetScrollHereY adjusts scrolling amount to make current cursor position visible. ratio=0.0: top, 0.5: center, 1.0: bottom. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.

func SetTabItemClosed 

func SetTabItemClosed(tabOrDockedWindowLabel string)

SetTabItemClosed notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars). For tab-bar: call after BeginTabBar() and before Tab submissions. Otherwise call with a window name.

func SetTooltip 

func SetTooltip(text string)

SetTooltip sets a text tooltip under the mouse-cursor, typically use with IsItemHovered(). Overrides any previous call to SetTooltip().

func ShowDemoWindow 

func ShowDemoWindow(open *bool)

ShowDemoWindow creates a demo/test window. Demonstrates most ImGui features. Call this to learn about the library! Try to make it always available in your application!

func ShowUserGuide 

func ShowUserGuide()

ShowUserGuide adds basic help/info block (not a window): how to manipulate ImGui as a end-user (mouse/keyboard controls).

func SliderFloat 

func SliderFloat(label string, value *float32, min, max float32) bool

SliderFloat calls SliderIntV(label, value, min, max, "%.3f", 1.0).

func SliderFloat3 

func SliderFloat3(label string, values *[3]float32, min, max float32) bool

SliderFloat3 calls SliderFloat3V(label, values, min, max, "%.3f", 1,0).

func SliderFloat3V 

func SliderFloat3V(label string, values *[3]float32, min, max float32, format string, power float32) bool

SliderFloat3V creates slider for a 3D vector.

func SliderFloatV 

func SliderFloatV(label string, value *float32, min, max float32, format string, power float32) bool

SliderFloatV creates a slider for floats.

func SliderInt 

func SliderInt(label string, value *int32, min, max int32) bool

SliderInt calls SliderIntV(label, value, min, max, "%d").

func SliderIntV 

func SliderIntV(label string, value *int32, min, max int32, format string) bool

SliderIntV creates a slider for integers.

func Spacing 

func Spacing()

Spacing adds vertical spacing.

func StyleColorsClassic 

func StyleColorsClassic()

func StyleColorsDark 

func StyleColorsDark()

func StyleColorsLight 

func StyleColorsLight()

func Text 

func Text(text string)

Text adds formatted text. See PushTextWrapPosV() or PushStyleColorV() for modifying the output. Without any modified style stack, the text is unformatted.

func TextLineHeight 

func TextLineHeight() float32

TextLineHeight returns ~ FontSize.

func TextLineHeightWithSpacing 

func TextLineHeightWithSpacing() float32

TextLineHeightWithSpacing returns ~ FontSize + style.ItemSpacing.y (distance in pixels between 2 consecutive lines of text).

func TreeNode 

func TreeNode(label string) bool

TreeNode calls TreeNodeV(label, 0).

func TreeNodeToLabelSpacing 

func TreeNodeToLabelSpacing() float32

TreeNodeToLabelSpacing returns the horizontal distance preceding label for a regular unframed TreeNode.

func TreeNodeV 

func TreeNodeV(label string, flags int) bool

TreeNodeV returns true if the tree branch is to be rendered. Call TreePop() in this case.

func TreePop 

func TreePop()

TreePop finishes a tree branch. This has to be called for a matching TreeNodeV call returning true.

func Version 

func Version() string

Version returns a version string e.g. "1.23".

func VertexBufferLayout 

func VertexBufferLayout() (entrySize int, posOffset int, uvOffset int, colOffset int)

VertexBufferLayout returns the byte sizes necessary to select fields in a vertex buffer of a DrawList.

func WindowHeight 

func WindowHeight() float32

WindowHeight returns the height of the current window.

func WindowWidth 

func WindowWidth() float32

WindowWidth returns the width of the current window.

Types

type Alpha8Image 

type Alpha8Image struct {
	Width, Height int
	Pixels        unsafe.Pointer
}

Alpha8Image represents a imgui backed 8-bit alpha value image.

type AssertHandler 

type AssertHandler func(expression string, file string, line int)

AssertHandler is a handler for an assertion that happened in the native part of ImGui.

type Clipboard 

type Clipboard interface {
	// Text returns the current text from the clipboard, if available.
	Text() (string, error)
	// SetText sets the text as the current text on the clipboard.
	SetText(value string)
}

Clipboard describes the access to the text clipboard of the window manager.

type Condition 

type Condition int

Condition for SetWindow***(), SetNextWindow***(), SetNextTreeNode***() functions. Important: Treat as a regular enum! Do NOT combine multiple values using binary operators! All the functions above treat 0 as a shortcut to ConditionAlways.

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context specifies a scope of ImGui.

All contexts share a same FontAtlas by default. If you want different font atlas, you can create them and overwrite the CurrentIO.Fonts of an ImGui context.

func CreateContext 

func CreateContext(fontAtlas *FontAtlas) *Context

CreateContext produces a new internal state scope. Passing nil for the fontAtlas creates a default font.

func CurrentContext 

func CurrentContext() (*Context, error)

CurrentContext returns the currently active state scope. Returns ErrNoContext if no context is available.

func (*Context) Destroy 

func (context *Context) Destroy()

Destroy removes the internal state scope. Trying to destroy an already destroyed context does nothing.

func (Context) SetCurrent 

func (context Context) SetCurrent() error

SetCurrent activates this context as the currently active state scope.

type DrawCommand 

type DrawCommand uintptr

DrawCommand describes one GPU call (or a callback).

func (DrawCommand) CallUserCallback 

func (cmd DrawCommand) CallUserCallback(list DrawList)

CallUserCallback calls the user callback instead of rendering the vertices. ClipRect and TextureID will be set normally.

func (DrawCommand) ClipRect 

func (cmd DrawCommand) ClipRect() (rect Vec4)

ClipRect defines the clipping rectangle (x1, y1, x2, y2).

func (DrawCommand) ElementCount 

func (cmd DrawCommand) ElementCount() int

ElementCount is the number of indices (multiple of 3) to be rendered as triangles. Vertices are stored in the callee DrawList's VertexBuffer, indices in IndexBuffer.

func (DrawCommand) HasUserCallback 

func (cmd DrawCommand) HasUserCallback() bool

HasUserCallback returns true if this handle command should be deferred.

func (DrawCommand) TextureID 

func (cmd DrawCommand) TextureID() TextureID

TextureID is the user-provided texture ID. Set by user in FontAtlas.SetTextureID() for fonts or passed to Image*() functions. Ignore if never using images or multiple fonts atlas.

type DrawData 

type DrawData uintptr

DrawData contains all draw data to render an ImGui frame.

func RenderedDrawData 

func RenderedDrawData() DrawData

RenderedDrawData returns the created draw commands, which are valid after Render() and until the next call to NewFrame(). This is what you have to render.

func (DrawData) CommandLists 

func (data DrawData) CommandLists() []DrawList

CommandLists is an array of DrawList to render. The DrawList are owned by the context and only pointed to from here.

func (DrawData) ScaleClipRects 

func (data DrawData) ScaleClipRects(scale Vec2)

ScaleClipRects is a helper to scale the ClipRect field of each DrawCmd. Use if your final output buffer is at a different scale than ImGui expects, or if there is a difference between your window resolution and framebuffer resolution.

func (DrawData) Valid 

func (data DrawData) Valid() bool

Valid indicates whether the structure is usable. It is valid only after Render() is called and before the next NewFrame() is called.

type DrawList 

type DrawList uintptr

DrawList is a draw-command list. This is the low-level list of polygons that ImGui functions are filling. At the end of the frame, all command lists are passed to your render function for rendering.

Each ImGui window contains its own DrawList. You can use GetWindowDrawList() to access the current window draw list and draw custom primitives.

You can interleave normal ImGui calls and adding primitives to the current draw list.

All positions are generally in pixel coordinates (top-left at (0,0), bottom-right at io.DisplaySize), however you are totally free to apply whatever transformation matrix to want to the data (if you apply such transformation you'll want to apply it to ClipRect as well)

Important: Primitives are always added to the list and not culled (culling is done at higher-level by ImGui functions), if you use this API a lot consider coarse culling your drawn objects.

func GetWindowDrawList 

func GetWindowDrawList() DrawList

func (DrawList) AddBezierCurve 

func (list DrawList) AddBezierCurve(pos0, cp0, cp1, pos1 Vec2, col Vec4, thickness float32, num_segments int)

func (DrawList) AddCircle 

func (list DrawList) AddCircle(center Vec2, radius float32, col Vec4, thickness float32)

func (DrawList) AddCircleFilled 

func (list DrawList) AddCircleFilled(center Vec2, radius float32, col Vec4)

func (DrawList) AddImage 

func (list DrawList) AddImage(textureId TextureID, pMin, pMax Vec2)

func (DrawList) AddImageV 

func (list DrawList) AddImageV(textureId TextureID, pMin, pMax Vec2, uvMin, uvMax Vec2, col Vec4)

func (DrawList) AddLine 

func (list DrawList) AddLine(p1, p2 Vec2, col Vec4, thickness float32)

func (DrawList) AddQuad 

func (list DrawList) AddQuad(p1, p2, p3, p4 Vec2, col Vec4, thickness float32)

func (DrawList) AddQuadFilled 

func (list DrawList) AddQuadFilled(p1, p2, p3, p4 Vec2, col Vec4)

func (DrawList) AddRect 

func (list DrawList) AddRect(pMin, pMax Vec2, col Vec4, rounding float32, rounding_corners int, thickness float32)

func (DrawList) AddRectFilled 

func (list DrawList) AddRectFilled(pMin, pMax Vec2, col Vec4, rounding float32, rounding_corners int)

func (DrawList) AddText 

func (list DrawList) AddText(pos Vec2, col Vec4, text string)

func (DrawList) AddTriangle 

func (list DrawList) AddTriangle(p1, p2, p3 Vec2, col Vec4, thickness float32)

func (DrawList) AddTriangleFilled 

func (list DrawList) AddTriangleFilled(p1, p2, p3 Vec2, col Vec4)

func (DrawList) Commands 

func (list DrawList) Commands() []DrawCommand

Commands returns the list of draw commands. Typically 1 command = 1 GPU draw call, unless the command is a callback.

func (DrawList) IndexBuffer 

func (list DrawList) IndexBuffer() (unsafe.Pointer, int)

IndexBuffer returns the handle information of the whole index buffer. Returned are the handle pointer and the total byte size. The buffer is a packed array of index entries, each consisting of an integer offset. To determine the byte size, call IndexBufferLayout.

func (DrawList) PathArcTo 

func (list DrawList) PathArcTo(center Vec2, radius, a_min, a_max float32, num_segments int)

func (DrawList) PathArcToFast 

func (list DrawList) PathArcToFast(center Vec2, radius float32, a_min_of_12, a_max_of_12 int)

func (DrawList) PathBezierCurveTo 

func (list DrawList) PathBezierCurveTo(p1, p2, p3 Vec2, num_segments int)

func (DrawList) PathClear 

func (list DrawList) PathClear()

Stateful path API, add points then finish with PathFillConvex() or PathStroke()

func (DrawList) PathFillConvex 

func (list DrawList) PathFillConvex(col Vec4)

func (DrawList) PathLineTo 

func (list DrawList) PathLineTo(pos Vec2)

func (DrawList) PathLineToMergeDuplicate 

func (list DrawList) PathLineToMergeDuplicate(pos Vec2)

func (DrawList) PathStroke 

func (list DrawList) PathStroke(col Vec4, closed bool, thickness float32)

func (DrawList) VertexBuffer 

func (list DrawList) VertexBuffer() (unsafe.Pointer, int)

VertexBuffer returns the handle information of the whole vertex buffer. Returned are the handle pointer and the total byte size. The buffer is a packed array of vertex entries, each consisting of a 2D position vector, a 2D UV vector, and a 4-byte color value. To determine the byte size and offset values, call VertexBufferLayout.

type ErrorMarkers 

type ErrorMarkers uintptr

func NewErrorMarkers 

func NewErrorMarkers() ErrorMarkers

func (ErrorMarkers) Clear 

func (e ErrorMarkers) Clear()

func (ErrorMarkers) Insert 

func (e ErrorMarkers) Insert(pos int, errMsg string)

func (ErrorMarkers) Size 

func (e ErrorMarkers) Size() uint

type Font 

type Font uintptr

Font describes one loaded font in an atlas. 

const DefaultFont Font = 0

DefaultFont can be used to refer to the default font of the current font atlas without having the actual font reference.

type FontAtlas 

type FontAtlas uintptr

FontAtlas contains runtime data for multiple fonts, bake multiple fonts into a single texture, TTF/OTF font loader

func (FontAtlas) AddFontDefault 

func (atlas FontAtlas) AddFontDefault() Font

AddFontDefault adds the default font to the atlas. This is done by default if you do not call any of the AddFont* methods before retrieving the texture data.

func (FontAtlas) AddFontDefaultV 

func (atlas FontAtlas) AddFontDefaultV(cfg FontConfig) Font

AddFontDefaultV adds the default font to the atlas using the specified FontConfig.

func (FontAtlas) AddFontFromFileTTF 

func (atlas FontAtlas) AddFontFromFileTTF(filename string, sizePixels float32) Font

AddFontFromFileTTF calls AddFontFromFileTTFV(filename, sizePixels, DefaultFontConfig, EmptyGlyphRanges).

func (FontAtlas) AddFontFromFileTTFV 

func (atlas FontAtlas) AddFontFromFileTTFV(filename string, sizePixels float32,
	config FontConfig, glyphRange GlyphRanges) Font

AddFontFromFileTTFV attempts to load a font from given TTF file.

func (FontAtlas) AddFontFromMemoryTTF 

func (atlas FontAtlas) AddFontFromMemoryTTF(fontData []byte, sizePixels float32) Font

AddFontFromMemoryTTF calls AddFontFromMemoryTTFV(fontData, sizePixels, DefaultFontConfig, EmptyGlyphRanges).

func (FontAtlas) AddFontFromMemoryTTFV 

func (atlas FontAtlas) AddFontFromMemoryTTFV(
	fontData []byte, sizePixels float32,
	config FontConfig,
	glyphRange GlyphRanges,
) Font

AddFontFromMemoryTTFV attempts to load a font from given TTF byte array.

func (FontAtlas) BuildWithFreeType 

func (atlas FontAtlas) BuildWithFreeType() error

BuildWithFreeType calls BuildWithFreeTypeV(0).

func (FontAtlas) BuildWithFreeTypeV 

func (atlas FontAtlas) BuildWithFreeTypeV(flags int) error

BuildWithFreeTypeV builds the FontAtlas using FreeType instead of the default rasterizer. FreeType renders small fonts better. Call this function instead of FontAtlas.Build() . As with FontAtlas.Build(), this function needs to be called before retrieving the texture data.

FreeType support must be enabled with the build tag "imguifreetype".

func (FontAtlas) GlyphRangesChineseFull 

func (atlas FontAtlas) GlyphRangesChineseFull() GlyphRanges

GlyphRangesChineseFull describes Default + Half-Width + Japanese Hiragana/Katakana + full set of about 21000 CJK Unified Ideographs.

func (FontAtlas) GlyphRangesChineseSimplifiedCommon 

func (atlas FontAtlas) GlyphRangesChineseSimplifiedCommon() GlyphRanges

GlyphRangesChineseSimplifiedCommon describes Default + Half-Width + Japanese Hiragana/Katakana + set of 2500 CJK Unified Ideographs for common simplified Chinese.

func (FontAtlas) GlyphRangesCyrillic 

func (atlas FontAtlas) GlyphRangesCyrillic() GlyphRanges

GlyphRangesCyrillic describes Default + about 400 Cyrillic characters.

func (FontAtlas) GlyphRangesDefault 

func (atlas FontAtlas) GlyphRangesDefault() GlyphRanges

GlyphRangesDefault describes Basic Latin, Extended Latin.

func (FontAtlas) GlyphRangesJapanese 

func (atlas FontAtlas) GlyphRangesJapanese() GlyphRanges

GlyphRangesJapanese describes Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs.

func (FontAtlas) GlyphRangesKorean 

func (atlas FontAtlas) GlyphRangesKorean() GlyphRanges

GlyphRangesKorean describes Default + Korean characters.

func (FontAtlas) GlyphRangesThai 

func (atlas FontAtlas) GlyphRangesThai() GlyphRanges

GlyphRangesThai describes Default + Thai characters.

func (FontAtlas) SetTexDesiredWidth 

func (atlas FontAtlas) SetTexDesiredWidth(value int)

SetTexDesiredWidth registers the width desired by user before building the image. Must be a power-of-two. If have many glyphs your graphics API have texture size restrictions you may want to increase texture width to decrease height. Set to 0 by default, causing auto-calculation.

func (FontAtlas) SetTextureID 

func (atlas FontAtlas) SetTextureID(id TextureID)

SetTextureID sets user data to refer to the texture once it has been uploaded to user's graphic systems. It is passed back to you during rendering via the DrawCommand.

func (FontAtlas) TextureDataAlpha8 

func (atlas FontAtlas) TextureDataAlpha8() *Alpha8Image

TextureDataAlpha8 returns the image in 8-bit alpha values for the font atlas. The returned image is valid as long as the font atlas is.

func (FontAtlas) TextureDataRGBA32 

func (atlas FontAtlas) TextureDataRGBA32() *RGBA32Image

TextureDataRGBA32 returns the image in 32-bit RGBA values for the font atlas. The returned image is valid as long as the font atlas is.

type FontConfig 

type FontConfig uintptr

FontConfig describes properties of a single font. 

const DefaultFontConfig FontConfig = 0

DefaultFontConfig lets ImGui take default properties as per implementation. The properties of the default configuration cannot be changed using the SetXXX functions.

func NewFontConfig 

func NewFontConfig() FontConfig

NewFontConfig creates a new font configuration. Delete must be called on the returned config.

func (*FontConfig) Delete 

func (config *FontConfig) Delete()

Delete removes the font configuration and resets it to the DefaultFontConfig.

func (FontConfig) SetGlyphMaxAdvanceX 

func (config FontConfig) SetGlyphMaxAdvanceX(value float32)

SetGlyphMaxAdvanceX sets the maximum AdvanceX for glyphs. Set both Min/Max to enforce mono-space font.

func (FontConfig) SetGlyphMinAdvanceX 

func (config FontConfig) SetGlyphMinAdvanceX(value float32)

SetGlyphMinAdvanceX sets the minimum AdvanceX for glyphs. Set Min to align font icons, set both Min/Max to enforce mono-space font.

func (FontConfig) SetMergeMode 

func (config FontConfig) SetMergeMode(value bool)

SetMergeMode merges the new fonts into the previous font if enabled. This way you can combine multiple input fonts into one (e.g. ASCII font + icons + Japanese glyphs). You may want to use GlyphOffset.y when merge font of different heights.

func (FontConfig) SetOversampleH 

func (config FontConfig) SetOversampleH(value int)

SetOversampleH sets the oversampling amount for the X axis. Rasterize at higher quality for sub-pixel positioning. We don't use sub-pixel positions on the Y axis.

func (FontConfig) SetOversampleV 

func (config FontConfig) SetOversampleV(value int)

SetOversampleV sets the oversampling amount for the Y axis. Rasterize at higher quality for sub-pixel positioning. We don't use sub-pixel positions on the Y axis.

func (FontConfig) SetPixelSnapH 

func (config FontConfig) SetPixelSnapH(value bool)

SetPixelSnapH aligns every glyph to pixel boundary if enabled. Useful e.g. if you are merging a non-pixel aligned font with the default font. If enabled, you can set OversampleH/V to 1.

func (FontConfig) SetSize 

func (config FontConfig) SetSize(sizePixels float32)

SetSize sets the size in pixels for rasterizer (more or less maps to the resulting font height).

type FontGlyphRangesBuilder 

type FontGlyphRangesBuilder uintptr

func NewFontGlyphRangesBuilder 

func NewFontGlyphRangesBuilder() FontGlyphRangesBuilder

func (FontGlyphRangesBuilder) AddRanges 

func (builder FontGlyphRangesBuilder) AddRanges(ranges GlyphRanges)

func (FontGlyphRangesBuilder) AddText 

func (builder FontGlyphRangesBuilder) AddText(text string)

func (FontGlyphRangesBuilder) BuildRanges 

func (builder FontGlyphRangesBuilder) BuildRanges(ranges GlyphRanges)

func (FontGlyphRangesBuilder) Clear 

func (builder FontGlyphRangesBuilder) Clear()

type FreeTypeError 

type FreeTypeError string

FreeTypeError describes a problem with FreeType font rendering.

func (FreeTypeError) Error 

func (err FreeTypeError) Error() string

Error returns the readable text presentation of the error.

type GLFW 

type GLFW struct {
	// contains filtered or unexported fields
}

GLFW implements a platform based on github.com/go-gl/glfw (v3.2).

func NewGLFW 

func NewGLFW(io IO, title string, width, height int, flags GLFWWindowFlags) (*GLFW, error)

NewGLFW attempts to initialize a GLFW context.

func (*GLFW) DisplaySize 

func (platform *GLFW) DisplaySize() [2]float32

DisplaySize returns the dimension of the display.

func (*GLFW) Dispose 

func (platform *GLFW) Dispose()

Dispose cleans up the resources.

func (*GLFW) FramebufferSize 

func (platform *GLFW) FramebufferSize() [2]float32

FramebufferSize returns the dimension of the framebuffer.

func (*GLFW) GetClipboard 

func (platform *GLFW) GetClipboard() string

func (*GLFW) GetContentScale 

func (platform *GLFW) GetContentScale() float32

func (*GLFW) GetWindow 

func (platform *GLFW) GetWindow() *glfw.Window

func (*GLFW) NewFrame 

func (platform *GLFW) NewFrame()

NewFrame marks the begin of a render pass. It forwards all current state to imgui IO.

func (*GLFW) PostRender 

func (platform *GLFW) PostRender()

PostRender performs a buffer swap.

func (*GLFW) ProcessEvents 

func (platform *GLFW) ProcessEvents()

ProcessEvents handles all pending window events.

func (*GLFW) SetClipboard 

func (platform *GLFW) SetClipboard(content string)

func (*GLFW) SetDropCallback 

func (platform *GLFW) SetDropCallback(cb func(names []string))

func (*GLFW) SetPosChangeCallback 

func (platform *GLFW) SetPosChangeCallback(cb func(int, int))

func (*GLFW) SetSizeChangeCallback 

func (platform *GLFW) SetSizeChangeCallback(cb func(int, int))

func (*GLFW) ShouldStop 

func (platform *GLFW) ShouldStop() bool

ShouldStop returns true if the window is to be closed.

func (*GLFW) Update 

func (platform *GLFW) Update()

func (*GLFW) WaitForEvent 

func (platform *GLFW) WaitForEvent()

type GLFWClipboard 

type GLFWClipboard struct {
	// contains filtered or unexported fields
}

func NewGLFWClipboard 

func NewGLFWClipboard(w *glfw.Window) *GLFWClipboard

func (*GLFWClipboard) SetText 

func (c *GLFWClipboard) SetText(text string)

func (*GLFWClipboard) Text 

func (c *GLFWClipboard) Text() (string, error)

type GLFWWindowFlags 

type GLFWWindowFlags uint8
const (
	GLFWWindowFlagsNotResizable GLFWWindowFlags = 1 << iota
	GLFWWindowFlagsMaximized
	GLFWWindowFlagsFloating
	GLFWWindowFlagsFrameless
	GLFWWindowFlagsTransparent
)

type GlyphRanges 

type GlyphRanges uintptr

GlyphRanges describes a list of Unicode ranges; 2 value per range, values are inclusive. Standard ranges can be queried from FontAtlas.GlyphRanges*() functions. 

const EmptyGlyphRanges GlyphRanges = 0

EmptyGlyphRanges is one that does not contain any ranges.

func NewGlyphRanges 

func NewGlyphRanges() GlyphRanges

func (GlyphRanges) Data 

func (ranges GlyphRanges) Data() GlyphRanges

type IO 

type IO struct {
	// contains filtered or unexported fields
}

IO is where your app communicate with ImGui. Access via CurrentIO(). Read 'Programmer guide' section in imgui.cpp file for general usage.

func CurrentIO 

func CurrentIO() IO

CurrentIO returns access to the ImGui communication struct for the currently active context.

func (IO) AddInputCharacters 

func (io IO) AddInputCharacters(chars string)

AddInputCharacters adds a new character into InputCharacters[].

func (IO) AddMouseWheelDelta 

func (io IO) AddMouseWheelDelta(horizontal, vertical float32)

AddMouseWheelDelta adds the given offsets to the current mouse wheel values. 1 vertical unit scrolls about 5 lines text. Most users don't have a mouse with an horizontal wheel, may not be provided by all back-ends.

func (IO) Fonts 

func (io IO) Fonts() FontAtlas

Fonts returns the font atlas to load and assemble one or more fonts into a single tightly packed texture.

func (IO) GetConfigFlags 

func (io IO) GetConfigFlags() int

func (IO) GetFrameCountSinceLastInput 

func (io IO) GetFrameCountSinceLastInput() int

func (IO) GetMouseDelta 

func (io IO) GetMouseDelta() Vec2

func (IO) GetMouseDrawCursor 

func (io IO) GetMouseDrawCursor() bool

func (IO) GetMouseWheelDelta 

func (io IO) GetMouseWheelDelta() float32

GetMouseWheelDelta returns the vertical delta of the mouse wheel.

func (IO) GetMouseWheelHDelta 

func (io IO) GetMouseWheelHDelta() float32

GetMouseWheelHDelta returns the horizontal delta of the mouse wheel.

func (IO) KeyAlt 

func (io IO) KeyAlt(leftAlt int, rightAlt int)

KeyAlt sets the keyboard modifier alt pressed.

func (IO) KeyCtrl 

func (io IO) KeyCtrl(leftCtrl int, rightCtrl int)

KeyCtrl sets the keyboard modifier control pressed.

func (IO) KeyMap 

func (io IO) KeyMap(imguiKey int, nativeKey int)

KeyMap maps a key into the KeysDown array which represents your "native" keyboard state.

func (IO) KeyPress 

func (io IO) KeyPress(key int)

KeyPress sets the KeysDown flag.

func (IO) KeyRelease 

func (io IO) KeyRelease(key int)

KeyRelease clears the KeysDown flag.

func (IO) KeyShift 

func (io IO) KeyShift(leftShift int, rightShift int)

KeyShift sets the keyboard modifier shift pressed.

func (IO) KeySuper 

func (io IO) KeySuper(leftSuper int, rightSuper int)

KeySuper sets the keyboard modifier super pressed.

func (IO) SetBackendFlags 

func (io IO) SetBackendFlags(flags int)

SetBackendFlags sets back-end capabilities.

func (IO) SetClipboard 

func (io IO) SetClipboard(board Clipboard)

SetClipboard registers a clipboard for text copy/paste actions. If no clipboard is set, then a fallback implementation may be used, if available for the OS. To disable clipboard handling overall, pass nil as the Clipboard.

Since ImGui queries the clipboard text via a return value, the wrapper has to hold the current clipboard text as a copy in memory. This memory will be freed at the next clipboard operation.

func (IO) SetConfigFlags 

func (io IO) SetConfigFlags(flags int)

SetConfigFlags sets the gamepad/keyboard navigation options, etc.

func (IO) SetDeltaTime 

func (io IO) SetDeltaTime(value float32)

SetDeltaTime sets the time elapsed since last frame, in seconds.

func (IO) SetDisplaySize 

func (io IO) SetDisplaySize(value Vec2)

SetDisplaySize sets the size in pixels.

func (IO) SetFontGlobalScale 

func (io IO) SetFontGlobalScale(value float32)

SetFontGlobalScale sets the global scaling factor for all fonts.

func (IO) SetFrameCountSinceLastInput 

func (io IO) SetFrameCountSinceLastInput(count int)

func (IO) SetIniFilename 

func (io IO) SetIniFilename(value string)

SetIniFilename changes the filename for the settings. Default: "imgui.ini". Use an empty string to disable the ini from being used.

func (IO) SetMouseButtonDown 

func (io IO) SetMouseButtonDown(index int, down bool)

SetMouseButtonDown sets whether a specific mouse button is currently pressed. Mouse buttons: left, right, middle + extras. ImGui itself mostly only uses left button (BeginPopupContext** are using right button). Other buttons allows us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.

func (IO) SetMouseDrawCursor 

func (io IO) SetMouseDrawCursor(b bool)

func (IO) SetMousePosition 

func (io IO) SetMousePosition(value Vec2)

SetMousePosition sets the mouse position, in pixels. Set to Vec2(-math.MaxFloat32,-mathMaxFloat32) if mouse is unavailable (on another screen, etc.)

func (IO) WantCaptureKeyboard 

func (io IO) WantCaptureKeyboard() bool

WantCaptureKeyboard returns true if imgui will use the keyboard inputs. Do not dispatch them to your main game/application (in both cases, always pass keyboard inputs to imgui). (e.g. InputText active, or an imgui window is focused and navigation is enabled, etc.).

func (IO) WantCaptureMouse 

func (io IO) WantCaptureMouse() bool

WantCaptureMouse returns true if imgui will use the mouse inputs. Do not dispatch them to your main game/application in this case. In either case, always pass on mouse inputs to imgui. (e.g. unclicked mouse is hovering over an imgui window, widget is active, mouse was clicked over an imgui window, etc.)

func (IO) WantTextInput 

func (io IO) WantTextInput() bool

WantTextInput is true, you may display an on-screen keyboard. This is set by ImGui when it wants textual keyboard input to happen (e.g. when a InputText widget is active).

type InputTextCallback 

type InputTextCallback func(InputTextCallbackData) int32

InputTextCallback is called for sharing state of an input field. By default, the callback should return 0.

type InputTextCallbackData 

type InputTextCallbackData struct {
	// contains filtered or unexported fields
}

InputTextCallbackData represents the shared state of InputText(), passed as an argument to your callback.

func (InputTextCallbackData) Buffer 

func (data InputTextCallbackData) Buffer() []byte

Buffer returns a view into the current UTF-8 buffer. Only during the callbacks of [Completion,History,Always] the current buffer is returned. The returned slice is a temporary view into the underlying raw buffer. Do not keep it! The underlying memory allocation may even change through a call to InsertBytes().

You may change the buffer through the following ways: If the new text has a different (encoded) length, use the functions InsertBytes() and/or DeleteBytes(). Otherwise you may keep the buffer as is and modify the bytes. If you change the buffer this way directly, mark the buffer as modified with MarkBufferModified().

func (InputTextCallbackData) CursorPos 

func (data InputTextCallbackData) CursorPos() int

CursorPos returns the byte-offset of the cursor within the buffer. Only valid during [Completion,History,Always] callbacks.

func (InputTextCallbackData) DeleteBytes 

func (data InputTextCallbackData) DeleteBytes(offset, count int)

DeleteBytes removes the given count of bytes starting at the specified byte offset within the buffer. This function can be called during the [Completion,History,Always] callbacks. Clears the current selection.

This function ignores the deletion beyond the current buffer length. Calling with negative offset or count arguments will panic.

func (InputTextCallbackData) EventChar 

func (data InputTextCallbackData) EventChar() rune

EventChar returns the current character input. Only valid during CharFilter callback.

func (InputTextCallbackData) EventFlag 

func (data InputTextCallbackData) EventFlag() int

EventFlag returns one of the InputTextFlagsCallback* constants to indicate the nature of the callback.

func (InputTextCallbackData) EventKey 

func (data InputTextCallbackData) EventKey() int

EventKey returns the currently pressed key. Valid for completion and history callbacks.

func (InputTextCallbackData) Flags 

func (data InputTextCallbackData) Flags() int

Flags returns the set of flags that the user originally passed to InputText.

func (InputTextCallbackData) InsertBytes 

func (data InputTextCallbackData) InsertBytes(offset int, bytes []byte)

InsertBytes inserts the given bytes at given byte offset into the buffer. Calling this function may change the underlying buffer allocation.

This function can be called during the [Completion,History,Always] callbacks. Clears the current selection.

Calling with an offset outside of the range of the buffer will panic.

func (InputTextCallbackData) MarkBufferModified 

func (data InputTextCallbackData) MarkBufferModified()

MarkBufferModified indicates that the content of the buffer was modified during a callback. Only considered during [Completion,History,Always] callbacks.

func (InputTextCallbackData) SelectionEnd 

func (data InputTextCallbackData) SelectionEnd() int

SelectionEnd returns the byte-offset of the selection end within the buffer. Only valid during [Completion,History,Always] callbacks.

func (InputTextCallbackData) SelectionStart 

func (data InputTextCallbackData) SelectionStart() int

SelectionStart returns the byte-offset of the selection start within the buffer. Only valid during [Completion,History,Always] callbacks.

func (InputTextCallbackData) SetCursorPos 

func (data InputTextCallbackData) SetCursorPos(value int)

SetCursorPos changes the current byte-offset of the cursor within the buffer. Only valid during [Completion,History,Always] callbacks.

func (InputTextCallbackData) SetEventChar 

func (data InputTextCallbackData) SetEventChar(value rune)

SetEventChar overrides what the user entered. Set to zero do drop the current input. Returning 1 from the callback also drops the current input. Only valid during CharFilter callback.

Note: The internal representation of characters is based on uint16, so less than rune would provide.

func (InputTextCallbackData) SetSelectionEnd 

func (data InputTextCallbackData) SetSelectionEnd(value int)

SetSelectionEnd changes the current byte-offset of the selection end within the buffer. Only valid during [Completion,History,Always] callbacks.

func (InputTextCallbackData) SetSelectionStart 

func (data InputTextCallbackData) SetSelectionStart(value int)

SetSelectionStart changes the current byte-offset of the selection start within the buffer. Only valid during [Completion,History,Always] callbacks.

type ListClipper 

type ListClipper struct {
	StartPosY    float32
	ItemsHeight  float32
	ItemsCount   int
	StepNo       int
	DisplayStart int
	DisplayEnd   int
}

ListClipper is a helper to manually clip large list of items. If you are submitting lots of evenly spaced items and you have a random access to the list, you can perform coarse clipping based on visibility to save yourself from processing those items at all. The clipper calculates the range of visible items and advance the cursor to compensate for the non-visible items we have skipped. ImGui already clips items based on their bounds but it needs to measure text size to do so. Coarse clipping before submission makes this cost and your own data fetching/submission cost null.

Usage 

var clipper imgui.ListClipper
clipper.Begin(1000)  // we have 1000 elements, evenly spaced.
for clipper.Step()
    for i := clipper.DisplayStart; i < clipper.DisplayEnd; i++
        imgui.Text(fmt.Sprintf("line number %d", i))

Step 0: the clipper let you process the first element, regardless of it being visible or not, so it can measure the element height (step skipped if user passed a known height at begin).

Step 1: the clipper infers height from first element, calculates the actual range of elements to display, and positions the cursor before the first element.

Step 2: dummy step only required if an explicit itemsHeight was passed to Begin() and user call Step(). Does nothing and switch to Step 3.

Step 3: the clipper validates that we have reached the expected Y position (corresponding to element DisplayEnd), advance the cursor to the end of the list and then returns 'false' to end the loop.

func (*ListClipper) Begin 

func (clipper *ListClipper) Begin(itemsCount int)

Begin calls BeginV(itemsCount, -1.0) .

func (*ListClipper) BeginV 

func (clipper *ListClipper) BeginV(itemsCount int, itemsHeight float32)

BeginV must be called before stepping. Use an itemCount of math.MaxInt if you don't know how many items you have. In this case the cursor won't be advanced in the final step.

For itemsHeight, use -1.0 to be calculated automatically on first step. Otherwise pass in the distance between your items, typically GetTextLineHeightWithSpacing() or GetFrameHeightWithSpacing().

func (*ListClipper) End 

func (clipper *ListClipper) End()

End resets the clipper. This function is automatically called on the last call of Step() that returns false.

func (*ListClipper) Step 

func (clipper *ListClipper) Step() bool

Step must be called in a loop until it returns false. The DisplayStart/DisplayEnd fields will be set and you can process/draw those items.

type OpenGL3 

type OpenGL3 struct {
	// contains filtered or unexported fields
}

OpenGL3 implements a renderer based on github.com/go-gl/gl (v3.2-core).

func NewOpenGL3 

func NewOpenGL3(io IO, contentScale float32) (*OpenGL3, error)

NewOpenGL3 attempts to initialize a renderer. An OpenGL context has to be established before calling this function.

func (*OpenGL3) Dispose 

func (renderer *OpenGL3) Dispose()

Dispose cleans up the resources.

func (*OpenGL3) LoadImage 

func (renderer *OpenGL3) LoadImage(image *image.RGBA) (TextureID, error)

Load image and return the TextureID

func (*OpenGL3) PreRender 

func (renderer *OpenGL3) PreRender(clearColor [4]float32)

PreRender clears the framebuffer.

func (*OpenGL3) ReleaseImage 

func (renderer *OpenGL3) ReleaseImage(textureId TextureID)

func (*OpenGL3) Render 

func (renderer *OpenGL3) Render(displaySize [2]float32, framebufferSize [2]float32, drawData DrawData)

Render translates the ImGui draw data to OpenGL3 commands.

type Payload 

type Payload uintptr

func AcceptDragDropPayload 

func AcceptDragDropPayload(payloadType string) Payload

func AcceptDragDropPayloadV 

func AcceptDragDropPayloadV(payloadType string, flags int) Payload

func (Payload) Data 

func (p Payload) Data() int

type Platform 

type Platform interface {
	// ShouldStop is regularly called as the abort condition for the program loop.
	ShouldStop() bool
	// ProcessEvents is called once per render loop to dispatch any pending events.
	ProcessEvents()
	// DisplaySize returns the dimension of the display.
	DisplaySize() [2]float32
	// FramebufferSize returns the dimension of the framebuffer.
	FramebufferSize() [2]float32
	// NewFrame marks the begin of a render pass. It must update the imgui IO state according to user input (mouse, keyboard, ...)
	NewFrame()
	// PostRender marks the completion of one render pass. Typically this causes the display buffer to be swapped.
	PostRender()
	// Dispose
	Dispose()
	// Set size change callback
	SetSizeChangeCallback(func(width, height int))
	// Set pos change callback
	SetPosChangeCallback(func(x, y int))
	// Set drop callback
	SetDropCallback(func(names []string))
	// Force Update
	Update()
	// GetContentScale function retrieves the content scale for the specified monitor.
	GetContentScale() float32
	// Get content from system clipboard
	GetClipboard() string
	// Set content to system clipboard
	SetClipboard(content string)
}

type RGBA32Image 

type RGBA32Image struct {
	Width, Height int
	Pixels        unsafe.Pointer
}

RGBA32Image represents a imgui backed 32-bit RGBA (8 bits per channel) value image.

type Renderer 

type Renderer interface {
	// PreRender causes the display buffer to be prepared for new output.
	PreRender(clearColor [4]float32)
	// Render draws the provided imgui draw data.
	Render(displaySize [2]float32, framebufferSize [2]float32, drawData DrawData)
	// Load image and return the TextureID
	LoadImage(image *image.RGBA) (TextureID, error)
	// Release image
	ReleaseImage(textureId TextureID)
	// Dispose
	Dispose()
}

Renderer covers rendering imgui draw data.

type Style 

type Style uintptr

Style describes the overall graphical representation of the user interface.

func CurrentStyle 

func CurrentStyle() Style

CurrentStyle returns the UI Style for the currently active context.

func (Style) FramePadding 

func (style Style) FramePadding() Vec2

func (Style) GetColor 

func (style Style) GetColor(id StyleColorID) Vec4

func (Style) ItemInnerSpacing 

func (style Style) ItemInnerSpacing() Vec2

ItemInnerSpacing is the horizontal and vertical spacing between elements of a composed widget (e.g. a slider and its label).

func (Style) ScaleAllSizes 

func (style Style) ScaleAllSizes(scale float32)

ScaleAllSizes applies a scaling factor to all sizes. To scale your entire UI (e.g. if you want your app to use High DPI or generally be DPI aware) you may use this helper function. Scaling the fonts is done separately and is up to you.

Important: This operation is lossy because all sizes are rounded to integer. If you need to change your scale multiples, call this over a freshly initialized style rather than scaling multiple times.

func (Style) SetColor 

func (style Style) SetColor(id StyleColorID, value Vec4)

SetColor sets a color value of the UI style.

func (Style) WindowPadding 

func (style Style) WindowPadding() Vec2

type StyleColorID 

type StyleColorID int

StyleColorID identifies a color in the UI style. 

const (
	StyleColorText                  StyleColorID = 0
	StyleColorTextDisabled          StyleColorID = 1
	StyleColorWindowBg              StyleColorID = 2
	StyleColorChildBg               StyleColorID = 3
	StyleColorPopupBg               StyleColorID = 4
	StyleColorBorder                StyleColorID = 5
	StyleColorBorderShadow          StyleColorID = 6
	StyleColorFrameBg               StyleColorID = 7
	StyleColorFrameBgHovered        StyleColorID = 8
	StyleColorFrameBgActive         StyleColorID = 9
	StyleColorTitleBg               StyleColorID = 10
	StyleColorTitleBgActive         StyleColorID = 11
	StyleColorTitleBgCollapsed      StyleColorID = 12
	StyleColorMenuBarBg             StyleColorID = 13
	StyleColorScrollbarBg           StyleColorID = 14
	StyleColorScrollbarGrab         StyleColorID = 15
	StyleColorScrollbarGrabHovered  StyleColorID = 16
	StyleColorScrollbarGrabActive   StyleColorID = 17
	StyleColorCheckMark             StyleColorID = 18
	StyleColorSliderGrab            StyleColorID = 19
	StyleColorSliderGrabActive      StyleColorID = 20
	StyleColorButton                StyleColorID = 21
	StyleColorButtonHovered         StyleColorID = 22
	StyleColorButtonActive          StyleColorID = 23
	StyleColorHeader                StyleColorID = 24
	StyleColorHeaderHovered         StyleColorID = 25
	StyleColorHeaderActive          StyleColorID = 26
	StyleColorSeparator             StyleColorID = 27
	StyleColorSeparatorHovered      StyleColorID = 28
	StyleColorSeparatorActive       StyleColorID = 29
	StyleColorResizeGrip            StyleColorID = 30
	StyleColorResizeGripHovered     StyleColorID = 31
	StyleColorResizeGripActive      StyleColorID = 32
	StyleColorTab                   StyleColorID = 33
	StyleColorTabHovered            StyleColorID = 34
	StyleColorTabActive             StyleColorID = 35
	StyleColorTabUnfocused          StyleColorID = 36
	StyleColorTabUnfocusedActive    StyleColorID = 37
	StyleColorPlotLines             StyleColorID = 38
	StyleColorPlotLinesHovered      StyleColorID = 39
	StyleColorPlotHistogram         StyleColorID = 40
	StyleColorPlotHistogramHovered  StyleColorID = 41
	StyleColorTextSelectedBg        StyleColorID = 42
	StyleColorDragDropTarget        StyleColorID = 43
	StyleColorNavHighlight          StyleColorID = 44 // Gamepad/keyboard: current highlighted item
	StyleColorNavWindowingHighlight StyleColorID = 45 // Highlight window when using CTRL+TAB
	StyleColorNavWindowingDarkening StyleColorID = 46 // Darken/colorize entire screen behind the CTRL+TAB window list, when active
	StyleColorModalWindowDarkening  StyleColorID = 47 // Darken/colorize entire screen behind a modal window, when one is active
)

StyleColor identifier

type StyleVarID 

type StyleVarID int

StyleVarID identifies a style variable in the UI style. 

const (
	// StyleVarAlpha is a float
	StyleVarAlpha StyleVarID = 0
	// StyleVarWindowPadding is a Vec2
	StyleVarWindowPadding StyleVarID = 1
	// StyleVarWindowRounding is a float
	StyleVarWindowRounding StyleVarID = 2
	// StyleVarWindowBorderSize is a float
	StyleVarWindowBorderSize StyleVarID = 3
	// StyleVarWindowMinSize is a Vec2
	StyleVarWindowMinSize StyleVarID = 4
	// StyleVarWindowTitleAlign is a Vec2
	StyleVarWindowTitleAlign StyleVarID = 5
	// StyleVarChildRounding is a float
	StyleVarChildRounding StyleVarID = 6
	// StyleVarChildBorderSize is a float
	StyleVarChildBorderSize StyleVarID = 7
	// StyleVarPopupRounding is a float
	StyleVarPopupRounding StyleVarID = 8
	// StyleVarPopupBorderSize is a float
	StyleVarPopupBorderSize StyleVarID = 9
	// StyleVarFramePadding is a Vec2
	StyleVarFramePadding StyleVarID = 10
	// StyleVarFrameRounding is a float
	StyleVarFrameRounding StyleVarID = 11
	// StyleVarFrameBorderSize is a float
	StyleVarFrameBorderSize StyleVarID = 12
	// StyleVarItemSpacing is a Vec2
	StyleVarItemSpacing StyleVarID = 13
	// StyleVarItemInnerSpacing is a Vec2
	StyleVarItemInnerSpacing StyleVarID = 14
	// StyleVarIndentSpacing is a float
	StyleVarIndentSpacing StyleVarID = 15
	// StyleVarScrollbarSize is a float
	StyleVarScrollbarSize StyleVarID = 16
	// StyleVarScrollbarRounding is a float
	StyleVarScrollbarRounding StyleVarID = 17
	// StyleVarGrabMinSize is a float
	StyleVarGrabMinSize StyleVarID = 18
	// StyleVarGrabRounding is a float
	StyleVarGrabRounding StyleVarID = 19
	// StyleVarTabRounding is a float
	StyleVarTabRounding StyleVarID = 20
	// StyleVarButtonTextAlign is a Vec2
	StyleVarButtonTextAlign StyleVarID = 21
	// StyleVarSelectableTextAlign is a Vec2
	StyleVarSelectableTextAlign StyleVarID = 22
)

type TextEditor 

type TextEditor uintptr

func NewTextEditor 

func NewTextEditor() TextEditor

func (TextEditor) GetCurrentLineText 

func (t TextEditor) GetCurrentLineText() string

func (TextEditor) GetCursorPos 

func (t TextEditor) GetCursorPos() (int, int)

func (TextEditor) GetSelectedText 

func (t TextEditor) GetSelectedText() string

func (TextEditor) GetSelectionStart 

func (t TextEditor) GetSelectionStart() (int, int)

func (TextEditor) GetText 

func (t TextEditor) GetText() string

func (TextEditor) HasSelection 

func (t TextEditor) HasSelection() bool

func (TextEditor) IsTextChanged 

func (t TextEditor) IsTextChanged() bool

func (TextEditor) Render 

func (t TextEditor) Render(title string, size Vec2, border bool)

func (TextEditor) SetErrorMarkers 

func (t TextEditor) SetErrorMarkers(markers ErrorMarkers)

func (TextEditor) SetLanguageDefinitionC 

func (t TextEditor) SetLanguageDefinitionC()

func (TextEditor) SetLanguageDefinitionCPP 

func (t TextEditor) SetLanguageDefinitionCPP()

func (TextEditor) SetLanguageDefinitionLua 

func (t TextEditor) SetLanguageDefinitionLua()

func (TextEditor) SetLanguageDefinitionSQL 

func (t TextEditor) SetLanguageDefinitionSQL()

func (TextEditor) SetShowWhitespaces 

func (t TextEditor) SetShowWhitespaces(show bool)

func (TextEditor) SetTabSize 

func (t TextEditor) SetTabSize(size int)

func (TextEditor) SetText 

func (t TextEditor) SetText(text string)

type TextureID 

type TextureID uintptr

TextureID is a user data to identify a texture.

TextureID is a uintptr used to pass renderer-agnostic texture references around until it hits your render function. imgui knows nothing about what those bits represent, it just passes them around. It is up to you to decide what you want the value to carry!

It could be an identifier to your OpenGL texture (cast as uint32), a key to your custom engine material, etc. At the end of the chain, your renderer takes this value to cast it back into whatever it needs to select a current texture to render.

To display a custom image/texture within an imgui window, you may use functions such as imgui.Image(). imgui will generate the geometry and draw calls using the TextureID that you passed and which your renderer can use. It is your responsibility to get textures uploaded to your GPU.

Note: Internally, the value is based on a pointer type, so its size is dependent on your architecture. For the most part, this will be 64bits on current systems (in 2018). Beware: This value must never be a Go pointer, because the value escapes the runtime!

type Vec2 

type Vec2 struct {
	X float32
	Y float32
}

Vec2 represents a two-dimensional vector.

func CalcTextSize 

func CalcTextSize(text string, hideTextAfterDoubleHash bool, wrapWidth float32) Vec2

CalcTextSize calculate the size of the text

func ContentRegionAvail 

func ContentRegionAvail() Vec2

ContentRegionAvail returns the size of the content region that is available (based on the current cursor position).

func CursorPos 

func CursorPos() Vec2

CursorPos returns the cursor position in window coordinates (relative to window position).

func CursorScreenPos 

func CursorScreenPos() Vec2

CursorScreenPos returns the cursor position in absolute screen coordinates.

func CursorStartPos 

func CursorStartPos() Vec2

CursorStartPos returns the initial cursor position in window coordinates.

func GetItemRectMax 

func GetItemRectMax() Vec2

func GetItemRectMin 

func GetItemRectMin() Vec2

func GetItemRectSize 

func GetItemRectSize() Vec2

func MousePos 

func MousePos() Vec2

MousePos returns the mouse position in absolute screen coordinates.

func WindowPos 

func WindowPos() Vec2

WindowPos returns the current window position in screen space. This is useful if you want to do your own drawing via the DrawList API.

func WindowSize 

func WindowSize() Vec2

WindowSize returns the size of the current window.

func (Vec2) Minus 

func (vec Vec2) Minus(other Vec2) Vec2

Minus returns vec - other.

func (Vec2) Plus 

func (vec Vec2) Plus(other Vec2) Vec2

Plus returns vec + other.

func (Vec2) Times 

func (vec Vec2) Times(value float32) Vec2

Times returns vec * value.

type Vec4 

type Vec4 struct {
	X float32
	Y float32
	Z float32
	W float32
}

Vec4 represents a four-dimensional vector.

func (Vec4) Minus 

func (vec Vec4) Minus(other Vec4) Vec4

Minus returns vec - other.

func (Vec4) Plus 

func (vec Vec4) Plus(other Vec4) Vec4

Plus returns vec + other.

func (Vec4) Times 

func (vec Vec4) Times(value float32) Vec4

Times returns vec * value.

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