nucular

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 Go to latest Published: Oct 4, 2024 License: MIT Imports: 35 Imported by: 28

README

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Mostly-immediate-mode GUI library for Go. Source port to go of an early version of nuklear.

⚠ Subject to backwards incompatible changes. ⚠

⚠ Feature requests unaccompanied by an implementation will not be serviced. ⚠

Documentation

See godoc, _examples/simple/main.go and _examples/overview/main.go for single window examples, _examples/demo/demo.go for a multi-window example, and gdlv for a more complex application built using nucular.

Screenshots

Overview Gdlv

Backend

Nucular uses build tags to select its backend:

go build -tags nucular_gio

Selects the gio backend.

go build -tags nucular_shiny

Selects the shiny backend.

go build -tags nucular_shiny,metal

Selects the shiny backend but uses metal to render on macOS.

By default shiny is used on all operating systems except macOS, where gio is used.

Documentation

Overview

Nucular is an immediate mode GUI library for Go, its implementation is a partial source port of Nuklear [0] by Micha Mettke. For a brief introduction to Immediate Mode GUI see [1]

Opening a Window

A window can be opened with the following three lines of code: 

wnd := nucular.NewMasterWindow(0, "Title", updatefn)
wnd.SetStyle(style.FromTheme(style.DarkTheme, 1.0))
wnd.Main()

The first line creates the MasterWindow object and sets its flags (usually 0 is fine) and updatefn as the update function. Updatefn will be responsible for drawing the contents of the window and handling the GUI logic (see the "Window Update and layout" section).

The second line configures the theme, the font (passing nil will use the default font face) and the default scaling factor (see the "Scaling" section).

The third line opens the window and starts its event loop, updatefn will be called whenever the window needs to be redrawn, this is usually only in response to mouse and keyboard events, if you want the window to be redrawn you can also manually call wnd.Changed().

Window Update and layout

The update function is responsible for drawing the contents of the window as well as handling user events, this is usually done by calling methods of nucular.Window.

For example, drawing a simple text button is done with this code: 

if w.ButtonText("button caption") {
	// code here only runs once every time the button is clicked
}

Widgets are laid out left to right and top to bottom, each row has a layout that can be configured calling the methods of nucular.rowConstructor (an instance of which can be obtained by calling the `nucular.Window.Row` or `nucular.Window.RowScaled`). There are three main row layout modes:

  • Static: in this mode the columns of the row have a fixed, user defined, width. This row layout can be selected calling Static or StaticScaled

  • Dynamic: in this mode the columns of the row have a width proportional to the total width of the window. This row layout can be selected calling Dynamic, DynamicScaled or Ratio

  • Space: in this mode widgets are positioned and sized arbitrarily. This row layout can be selected calling SpaceBegin or SpaceBeginRatio, once this row layout is selected widgets can be positioned using LayoutSpacePush or LayoutSpacePushRatio

Scaling

When calling SetStyle you can specify a scaling factor, this will be used to scale the sizes in the style argument and also all the size arguments for the methods of rowConstructor.

Links 

[0] https://github.com/vurtun/nuklear/
[1] https://mollyrocket.com/861

Index

Constants

This section is empty.

Variables

View Source 
var InvalidLayoutErr = errors.New("invalid layout")
View Source 
var UnknownCommandErr = errors.New("unknown command")
View Source 
var UsingSubErr = errors.New("parent window used while populating a sub window")
View Source 
var WrongLayoutErr = errors.New("Command not available with current layout")

Functions

func ChangeFontWidthCache 

func ChangeFontWidthCache(size int)

func FilterDecimal 

func FilterDecimal(c rune) bool

func FilterDefault 

func FilterDefault(c rune) bool

func FilterFloat 

func FilterFloat(c rune) bool

func FontHeight 

func FontHeight(f font.Face) int

func FontWidth 

func FontWidth(f font.Face, str string) int

func GroupListStart 

func GroupListStart(w *Window, num int, name string, flags WindowFlags) (GroupList, *Window)

GroupListStart starts a scrollable list of <num> rows of <height> height

Types

type DockSplit 

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

func (*DockSplit) Open 

func (ds *DockSplit) Open(title string, flags WindowFlags, rect rect.Rect, scale bool, updateFn UpdateFn)

func (*DockSplit) Split 

func (ds *DockSplit) Split(horiz bool, size int) (left, right *DockSplit)

type EditEvents 

type EditEvents int
const (
	EditActive EditEvents = 1 << iota
	EditInactive
	EditActivated
	EditDeactivated
	EditCommitted
)

type EditFlags 

type EditFlags int
const (
	EditDefault  EditFlags = 0
	EditReadOnly EditFlags = 1 << iota
	EditAutoSelect
	EditSigEnter
	EditNoCursor
	EditSelectable
	EditClipboard
	EditCtrlEnterNewline
	EditNoHorizontalScroll
	EditAlwaysInsertMode
	EditMultiline
	EditNeverInsertMode
	EditFocusFollowsMouse
	EditNoContextMenu
	EditIbeamCursor

	EditSimple = EditAlwaysInsertMode
	EditField  = EditSelectable | EditClipboard | EditSigEnter
	EditBox    = EditSelectable | EditMultiline | EditClipboard
)

type FilterFunc 

type FilterFunc func(c rune) bool

type FittingWidthFn 

type FittingWidthFn func(width int)

type GroupList 

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

func (*GroupList) Center 

func (gl *GroupList) Center()

func (*GroupList) Index 

func (gl *GroupList) Index() int

func (*GroupList) Next 

func (gl *GroupList) Next() bool

func (*GroupList) SkipToVisible 

func (gl *GroupList) SkipToVisible(lineheight int)

func (*GroupList) SkipToVisibleScaled 

func (gl *GroupList) SkipToVisibleScaled(lineheight int)

type Heading 

type Heading int
const (
	Up Heading = iota
	Right
	Down
	Left
)

type Input 

type Input struct {
	Keyboard KeyboardInput
	Mouse    MouseInput
	// contains filtered or unexported fields
}

type KeyboardInput 

type KeyboardInput struct {
	Keys []key.Event
	Text string
}

func (*KeyboardInput) Pressed 

func (i *KeyboardInput) Pressed(key key.Code) bool

type MasterWindow 

type MasterWindow interface {
	Main()
	Changed()
	Close()
	Closed() bool
	OnClose(func())
	ActivateWindow(*Window)
	ActivateEditor(*Window, interface{})

	Style() *nstyle.Style
	SetStyle(*nstyle.Style)

	GetPerf() bool
	SetPerf(bool)

	Input() *Input

	PopupOpen(title string, flags WindowFlags, rect rect.Rect, scale bool, updateFn UpdateFn)

	Walk(WindowWalkFn)
	ResetWindows() *DockSplit

	Lock()
	Unlock()
	// contains filtered or unexported methods
}

func NewMasterWindow 

func NewMasterWindow(flags WindowFlags, title string, updatefn UpdateFn) MasterWindow

func NewMasterWindowSize 

func NewMasterWindowSize(flags WindowFlags, title string, sz image.Point, updatefn UpdateFn) MasterWindow

Creates new master window

type MouseInput 

type MouseInput struct {
	Buttons     [4]mouseButton
	Pos         image.Point
	Prev        image.Point
	Delta       image.Point
	ScrollDelta float32
	// contains filtered or unexported fields
}

func (*MouseInput) AnyClickInRect 

func (i *MouseInput) AnyClickInRect(b rect.Rect) bool

func (*MouseInput) Clicked 

func (i *MouseInput) Clicked(id mouse.Button, rect rect.Rect) bool

func (*MouseInput) Down 

func (i *MouseInput) Down(id mouse.Button) bool

func (*MouseInput) HasClickInRect 

func (i *MouseInput) HasClickInRect(id mouse.Button, b rect.Rect) bool

func (*MouseInput) HoveringRect 

func (i *MouseInput) HoveringRect(rect rect.Rect) bool

func (*MouseInput) IsClickDownInRect 

func (i *MouseInput) IsClickDownInRect(id mouse.Button, b rect.Rect, down bool) bool

func (*MouseInput) IsClickInRect 

func (i *MouseInput) IsClickInRect(id mouse.Button, b rect.Rect) bool

func (*MouseInput) Pressed 

func (i *MouseInput) Pressed(id mouse.Button) bool

func (*MouseInput) PrevHoveringRect 

func (i *MouseInput) PrevHoveringRect(rect rect.Rect) bool

func (*MouseInput) Released 

func (i *MouseInput) Released(id mouse.Button) bool

type ScalableSplit 

type ScalableSplit struct {
	Size    int
	MinSize int
	Spacing int
	// contains filtered or unexported fields
}

func (*ScalableSplit) Horizontal 

func (s *ScalableSplit) Horizontal(w *Window, bounds rect.Rect) (bounds0, bounds1 rect.Rect)

func (*ScalableSplit) Vertical 

func (s *ScalableSplit) Vertical(w *Window, bounds rect.Rect) (bounds0, bounds1 rect.Rect)

type TextEditType 

type TextEditType int
const (
	TextEditSingleLine TextEditType = iota
	TextEditMultiLine
)

type TextEditor 

type TextEditor struct {
	Cursor       int
	Buffer       []rune
	Filter       FilterFunc
	Flags        EditFlags
	CursorFollow bool
	Redraw       bool

	Maxlen int

	PasswordChar rune // if non-zero all characters are displayed like this character

	Initialized            bool
	Active                 bool
	InsertMode             bool
	Scrollbar              image.Point
	SelectStart, SelectEnd int
	HasPreferredX          bool
	SingleLine             bool
	PreferredX             int
	Undo                   textUndoState
	// contains filtered or unexported fields
}

TextEditor stores the state of a text editor. To add a text editor to a window create a TextEditor object with &TextEditor{}, store it somewhere then in the update function call the Edit method passing the window to it.

func (*TextEditor) Cut 

func (edit *TextEditor) Cut() int

func (*TextEditor) Delete 

func (edit *TextEditor) Delete(where int, len int)

Deletes a chunk of text in the editor.

func (*TextEditor) DeleteSelection 

func (edit *TextEditor) DeleteSelection()

Deletes selection.

func (*TextEditor) DoRedo 

func (edit *TextEditor) DoRedo()

func (*TextEditor) DoUndo 

func (edit *TextEditor) DoUndo()

func (*TextEditor) Edit 

func (edit *TextEditor) Edit(win *Window) EditEvents

Adds text editor edit to win. Initial contents of the text editor will be set to text. If alwaysSet is specified the contents of the editor will be reset to text.

func (*TextEditor) Paste 

func (edit *TextEditor) Paste(ctext string)

Paste from clipboard

func (*TextEditor) SelectAll 

func (edit *TextEditor) SelectAll()

func (*TextEditor) Text 

func (edit *TextEditor) Text(text []rune)

type TreeType 

type TreeType int
const (
	TreeNode TreeType = iota
	TreeTab
)

type UpdateFn 

type UpdateFn func(*Window)

type Window 

type Window struct {
	LastWidgetBounds rect.Rect
	Data             interface{}
	HelpClicked      bool

	Bounds    rect.Rect
	Scrollbar image.Point
	// contains filtered or unexported fields
}

func (*Window) At 

func (win *Window) At() image.Point

func (*Window) Button 

func (win *Window) Button(lbl label.Label, repeat bool) bool

Button adds a button

func (*Window) ButtonText 

func (win *Window) ButtonText(text string) bool

func (*Window) CheckboxText 

func (win *Window) CheckboxText(text string, active *bool) bool

CheckboxText adds a checkbox button to win. Active will contain the checkbox value. Returns true when value changes.

func (*Window) Close 

func (win *Window) Close()

Programmatically closes this window

func (*Window) Combo 

func (win *Window) Combo(lbl label.Label, height int, updateFn UpdateFn) *Window

Adds a drop-down list to win.

func (*Window) ComboSimple 

func (win *Window) ComboSimple(items []string, selected int, item_height int) int

Adds a drop-down list to win. The contents are specified by items, with selected being the index of the selected item.

func (*Window) Commands 

func (win *Window) Commands() *command.Buffer

func (*Window) ContextualOpen 

func (win *Window) ContextualOpen(flags WindowFlags, size image.Point, trigger_bounds rect.Rect, updateFn UpdateFn) *Window

Opens a contextual menu with maximum size equal to 'size'. Specify size == image.Point{} if you want a menu big enough to fit its larges MenuItem

func (*Window) Custom 

func (win *Window) Custom(state nstyle.WidgetStates) (bounds rect.Rect, out *command.Buffer)

Custom adds a custom widget.

func (*Window) CustomState 

func (win *Window) CustomState() nstyle.WidgetStates

CustomState returns the widget state of a custom widget.

func (*Window) GroupBegin 

func (win *Window) GroupBegin(title string, flags WindowFlags) *Window

Creates a group of widgets. Group are useful for creating lists as well as splitting a main window into tiled subwindows. Items that you want to add to the group should be added to the returned window.

func (*Window) GroupEnd 

func (win *Window) GroupEnd()

Signals that you are done adding widgets to a group.

func (*Window) Image 

func (win *Window) Image(img *image.RGBA)

Image draws an image.

func (*Window) Input 

func (win *Window) Input() *Input

func (*Window) Invisible 

func (win *Window) Invisible(slop int) (above, below bool)

Will return (false, false) if the last widget is visible, (true, false) if it is above the visible area, (false, true) if it is below the visible area

func (*Window) KeyboardOnHover 

func (win *Window) KeyboardOnHover(bounds rect.Rect) KeyboardInput

func (*Window) Label 

func (win *Window) Label(str string, alignment label.Align)

Label draws a text label.

func (*Window) LabelColored 

func (win *Window) LabelColored(str string, alignment label.Align, color color.RGBA)

LabelColored draws a text label with the specified background color.

func (*Window) LabelWrap 

func (win *Window) LabelWrap(str string)

LabelWrap draws a text label, autowrapping its contents.

func (*Window) LabelWrapColored 

func (win *Window) LabelWrapColored(str string, color color.RGBA)

LabelWrapColored draws a text label with the specified background color autowrappping the text.

func (*Window) LayoutAvailableHeight 

func (win *Window) LayoutAvailableHeight() int

Returns remaining available height of win in scaled units.

func (*Window) LayoutAvailableWidth 

func (win *Window) LayoutAvailableWidth() int

func (*Window) LayoutFitWidth 

func (win *Window) LayoutFitWidth(id int, minwidth int)

LayoutFitWidth adds a new column to a static layout. The width of the column will be large enough to fit the largest widget exactly. The largest widget will only be calculated once per id, if the dataset changes the id should change.

func (*Window) LayoutReserveRow 

func (win *Window) LayoutReserveRow(height int, num int)

Reserves space for num rows of the specified height at the bottom of the panel. If a row of height == 0 is inserted it will take reserved space into account.

func (*Window) LayoutReserveRowScaled 

func (win *Window) LayoutReserveRowScaled(height int, num int)

Like LayoutReserveRow but with a scaled height.

func (*Window) LayoutResetStatic 

func (win *Window) LayoutResetStatic(width ...int)

Reset static row

func (*Window) LayoutResetStaticScaled 

func (win *Window) LayoutResetStaticScaled(width ...int)

func (*Window) LayoutSetWidth 

func (win *Window) LayoutSetWidth(width int)

LayoutSetWidth adds a new column with the specified width to a static layout.

func (*Window) LayoutSetWidthScaled 

func (win *Window) LayoutSetWidthScaled(width int)

LayoutSetWidthScaled adds a new column width the specified scaled width to a static layout.

func (*Window) LayoutSpacePush 

func (win *Window) LayoutSpacePush(rect rect.Rect)

Sets position and size of the next widgets in a Space row layout

func (*Window) LayoutSpacePushRatio 

func (win *Window) LayoutSpacePushRatio(x, y, w, h float64)

Sets position and size of the next widgets in a Space row layout

func (*Window) LayoutSpacePushScaled 

func (win *Window) LayoutSpacePushScaled(rect rect.Rect)

Like LayoutSpacePush but with scaled units

func (*Window) Master 

func (w *Window) Master() MasterWindow

func (*Window) Menu 

func (win *Window) Menu(lbl label.Label, width int, updateFn UpdateFn) *Window

Adds a menu to win with a text label. If width == 0 the width will be automatically adjusted to fit the largest MenuItem

func (*Window) MenuItem 

func (win *Window) MenuItem(lbl label.Label) bool

MenuItem adds a menu item

func (*Window) MenubarBegin 

func (win *Window) MenubarBegin()

MenubarBegin adds a menubar to the current window. A menubar is an area displayed at the top of the window that is unaffected by scrolling. Remember to call MenubarEnd when you are done adding elements to the menubar.

func (*Window) MenubarEnd 

func (win *Window) MenubarEnd()

MenubarEnd signals that all widgets have been added to the menubar.

func (*Window) OptionText 

func (win *Window) OptionText(text string, is_active bool) bool

OptionText adds a radio button to win. If is_active is true the radio button will be drawn selected. Returns true when the button is clicked once. You are responsible for ensuring that only one radio button is selected at once.

func (*Window) Progress 

func (win *Window) Progress(cur *int, maxval int, is_modifiable bool) bool

Adds a progress bar to win. if is_modifiable is true the progress bar will be user modifiable through click-and-drag. Returns true when the progress bar values is modified.

func (*Window) PropertyFloat 

func (win *Window) PropertyFloat(name string, min float64, val *float64, max, step, inc_per_pixel float64, prec int) (changed bool)

Adds a property widget to win for floating point properties. A property widget will display a text label, a small text editor for the property value and one up and one down button. The value can be modified by editing the text value, by clicking the up/down buttons (which will increase/decrease the value by step) or by clicking and dragging over the label. Returns true when the property's value is changed

func (*Window) PropertyInt 

func (win *Window) PropertyInt(name string, min int, val *int, max, step, inc_per_pixel int) (changed bool)

Same as PropertyFloat but with integer values.

func (*Window) Row 

func (win *Window) Row(height int) *rowConstructor

Changes row layout and starts a new row. Use the returned value to configure the new row layout: 

win.Row(10).Static(100, 120, 100)

If height == 0 all the row is stretched to fill all the remaining space.

func (*Window) RowScaled 

func (win *Window) RowScaled(height int) *rowConstructor

Same as Row but with scaled units.

func (*Window) SelectableLabel 

func (win *Window) SelectableLabel(str string, align label.Align, value *bool) bool

SelectableLabel adds a selectable label. Value is a pointer to a flag that will be changed to reflect the selected state of this label. Returns true when the label is clicked.

func (*Window) SetTitle 

func (win *Window) SetTitle(s string)

SetTitle cannot be used to change the title of the Root window, only sub-windows and the gio backend.

func (*Window) SliderFloat 

func (win *Window) SliderFloat(min_value float64, value *float64, max_value float64, value_step float64) bool

Adds a slider with a floating point value to win. Returns true when the slider's value is changed.

func (*Window) SliderInt 

func (win *Window) SliderInt(min int, val *int, max int, step int) bool

Adds a slider with an integer value to win. Returns true when the slider's value changes.

func (*Window) Spacing 

func (win *Window) Spacing(cols int)

Spacing adds empty space

func (*Window) Title 

func (win *Window) Title() string

func (*Window) Tooltip 

func (win *Window) Tooltip(text string)

Shows a tooltip window containing the specified text.

func (*Window) TooltipOpen 

func (win *Window) TooltipOpen(width int, scale bool, updateFn UpdateFn)

Displays a tooltip window.

func (*Window) TreeClose 

func (win *Window) TreeClose(path ...string)

Closes the collapsable section specified by path

func (*Window) TreeIsOpen 

func (win *Window) TreeIsOpen(name string) bool

Returns true if the specified node is open

func (*Window) TreeOpen 

func (win *Window) TreeOpen(path ...string)

Opens the collapsable section specified by path

func (*Window) TreePop 

func (win *Window) TreePop()

TreePop signals that the program is done adding elements to the current collapsable section.

func (*Window) TreePush 

func (win *Window) TreePush(type_ TreeType, title string, initialOpen bool) bool

func (*Window) TreePushCustom 

func (win *Window) TreePushCustom(type_ TreeType, name string, initial_open bool) (bounds rect.Rect, out *command.Buffer, ok bool)

func (*Window) TreePushNamed 

func (win *Window) TreePushNamed(type_ TreeType, name, title string, initial_open bool) bool

Creates a new collapsable section inside win. Returns true when the section is open. Widgets that are inside this collapsable section should be added to win only when this function returns true. Once you are done adding elements to the collapsable section call TreePop. Initial_open will determine whether this collapsable section will be initially open. Type_ will determine the style of this collapsable section.

func (*Window) TreePushNothing 

func (win *Window) TreePushNothing(type_ TreeType, name string, initial_open bool) (isopen bool, start func() bool)

func (*Window) WidgetBounds 

func (win *Window) WidgetBounds() rect.Rect

Returns the position and size of the next widget that will be added to the current row. Note that the return value is in scaled units.

func (*Window) WindowStyle 

func (win *Window) WindowStyle() *nstyle.Window

type WindowFlags 

type WindowFlags int
const (
	WindowBorder WindowFlags = 1 << iota
	WindowBorderHeader
	WindowMovable
	WindowScalable
	WindowClosable
	WindowDynamic
	WindowNoScrollbar
	WindowNoHScrollbar
	WindowTitle
	WindowContextualReplace
	WindowNonmodal
	WindowHelp

	WindowDefaultFlags = WindowBorder | WindowMovable | WindowScalable | WindowClosable | WindowTitle
)

type WindowWalkFn 

type WindowWalkFn func(w *Window, title string, data interface{}, docked bool, splitSize int, rect rect.Rect)

Source Files

View all Source files

Directories

Path Synopsis
_examples
demo
overview
richtext
richtext/internal/assets
simple
tests
internal
assets

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