Documentation ¶
Overview ¶
Package system provides a Go operating system interface framework to support events, window management, and other OS-specific functionality needed for full GUI support.
Index ¶
- Constants
- Variables
- func AssertCapture(t imagex.TestingT, filename string)
- func Capture() *image.RGBA
- func CaptureAs(filename string) error
- func CrashLogText(r any, stack string) string
- func HandleRecoverBase(r any)
- func HandleRecoverPanic(r any)
- func LogicalFromPhysicalDPI(logScale, pdpi float32) float32
- func SetLogicalDPIScale(scrnName string, dpiScale float32)
- func WindowFlagsToBool(flags WindowFlags) (dialog, modal, tool, fullscreen bool)
- type App
- type Clipboard
- type ClipboardBase
- type Cursor
- type CursorBase
- type Drawer
- type DrawerBase
- func (dw *DrawerBase) ConfigImageDefaultFormat(idx int, width int, height int, layers int)
- func (dw *DrawerBase) Copy(idx, layer int, dp image.Point, sr image.Rectangle, op draw.Op, flipY bool) error
- func (dw *DrawerBase) EndFill()
- func (dw *DrawerBase) Fill(clr color.Color, src2dst math32.Matrix3, reg image.Rectangle, op draw.Op) error
- func (dw *DrawerBase) MaxTextures() int
- func (dw *DrawerBase) Scale(idx, layer int, dr image.Rectangle, sr image.Rectangle, op draw.Op, flipY bool, ...) error
- func (dw *DrawerBase) SetFrameImage(idx int, fb any)
- func (dw *DrawerBase) SetGoImage(idx, layer int, img image.Image, flipY bool)
- func (dw *DrawerBase) SetMaxTextures(maxTextures int)
- func (dw *DrawerBase) StartDraw(descIndex int) bool
- func (dw *DrawerBase) StartFill() bool
- func (dw *DrawerBase) Surface() any
- func (dw *DrawerBase) SyncImages()
- func (dw *DrawerBase) UseTextureSet(descIndex int)
- type NewWindowOptions
- type Platforms
- func (i Platforms) Desc() string
- func (i Platforms) Int64() int64
- func (p Platforms) IsMobile() bool
- func (i Platforms) MarshalText() ([]byte, error)
- func (i *Platforms) SetInt64(in int64)
- func (i *Platforms) SetString(s string) error
- func (i Platforms) String() string
- func (i *Platforms) UnmarshalText(text []byte) error
- func (i Platforms) Values() []enums.Enum
- type Screen
- type ScreenOrientation
- func (i ScreenOrientation) Desc() string
- func (i ScreenOrientation) Int64() int64
- func (i ScreenOrientation) MarshalText() ([]byte, error)
- func (i *ScreenOrientation) SetInt64(in int64)
- func (i *ScreenOrientation) SetString(s string) error
- func (i ScreenOrientation) String() string
- func (i *ScreenOrientation) UnmarshalText(text []byte) error
- func (i ScreenOrientation) Values() []enums.Enum
- type Window
- type WindowFlags
- func (i WindowFlags) BitIndexString() string
- func (i WindowFlags) Desc() string
- func (i WindowFlags) HasFlag(f enums.BitFlag) bool
- func (i WindowFlags) Int64() int64
- func (i WindowFlags) MarshalText() ([]byte, error)
- func (i *WindowFlags) SetFlag(on bool, f ...enums.BitFlag)
- func (i *WindowFlags) SetInt64(in int64)
- func (i *WindowFlags) SetString(s string) error
- func (i *WindowFlags) SetStringOr(s string) error
- func (i WindowFlags) String() string
- func (i *WindowFlags) UnmarshalText(text []byte) error
- func (i WindowFlags) Values() []enums.Enum
Constants ¶
const ( // MaxTexturesPerSet is the maximum number of image variables that can be used // in one descriptor set. This value is a lowest common denominator across // platforms. To overcome this limitation, when more Texture vals are allocated, // multiple NDescs are used, setting the and switch // across those -- each such Desc set can hold this many textures. // NValsPer on a Texture var can be set higher and only this many will be // allocated in the descriptor set, with bindings of values wrapping // around across as many such sets as are vals, with a warning if insufficient // numbers are present. MaxTexturesPerSet = 16 // MaxImageLayers is the maximum number of layers per image MaxImageLayers = 128 // FlipY used as named arg for flipping the Y axis of images, etc FlipY = true // NoFlipY used as named arg for not flipping the Y axis of images NoFlipY = false )
Variables ¶
var ( // TheApp is the current [App]; only one is ever in effect. TheApp App // AppVersion is the version of the current app. // It is set by a linker flag in the core command line tool. AppVersion = "dev" // CoreVersion is the version of Cogent Core that the current app is using. // It is set by a linker flag in the core command line tool. CoreVersion = "dev" // ReservedWebShortcuts is a list of shortcuts that are reserved on the web // platform, meaning that they are handled by the browser instead of Cogent Core. // By default, this list contains important web shortcuts like Command+r and Command+(1-9). // All instances of "Command" are automatically converted to "Control" on non-macOS system // platforms, meaning that shortcuts should typically be expressed using "Command" for // cross-platform support. Modifiers should be specified in the order of [key.Modifiers]: // Shift, Control, Alt, Command. Shortcuts can be removed from this list by an app whose use of // them is more important than the default web action for that shortcut. ReservedWebShortcuts = []string{"Command+r", "Command+Shift+r", "Command+w", "Command+t", "Command+Shift+t", "Command+q", "Command+n", "Command+m", "Command+l", "Command+h", "Command+Shift+j", "Command+Alt+j", "Command+Alt+∆", "Command+1", "Command+2", "Command+3", "Command+4", "Command+5", "Command+6", "Command+7", "Command+8", "Command+9"} )
var ( // NeedsCapture is whether the app drawer needs to capture its next // frame. End-user code should just use [Capture]. NeedsCapture bool // CaptureImage is the variable that stores the image captured in // [Capture]. End-user code should just use [Capture]. CaptureImage *image.RGBA )
var ( // LogicalDPIScale is the default scaling factor for Logical DPI // as a multiplier on Physical DPI. // Smaller numbers produce smaller font sizes etc. LogicalDPIScale = float32(1) // LogicalDPIScales are per-screen name versions of LogicalDPIScale // these can be set from preferences (as in gi/prefs) on a per-screen // basis. LogicalDPIScales map[string]float32 )
var HandleRecover = func(r any) { HandleRecoverBase(r) HandleRecoverPanic(r) }
HandleRecover takes the given value of recover, and, if it is not nil, handles it. The behavior of HandleRecover can be customized by changing it to a custom function, but by default it calls HandleRecoverBase and HandleRecoverPanic, which safely prints a stack trace, saves a crash log, and panics on non-mobile platforms. It is set in core to a function that does the aforementioned things in addition to creating a GUI error dialog. HandleRecover should be called at the start of every goroutine whenever possible. The correct usage of HandleRecover is:
func myFunc() { defer func() { system.HandleRecover(recover()) }() ... }
var InitScreenLogicalDPIFunc func()
InitScreenLogicalDPIFunc is a function that can be set to initialize the screen LogicalDPI values based on user preferences etc. Called just before first window is opened.
var OnSystemWindowCreated chan struct{}
OnSystemWindowCreated is a channel used to communicate that the underlying system window has been created on iOS and Android. If it is nil, it indicates that the current platform does not have an underlying system window that is created asynchronously, or that system window has already been created and thus this is no longer applicable. If it is non-nil, no actions with the window should be taken until a signal is sent.
Functions ¶
func AssertCapture ¶
AssertCapture asserts that the result of Capture is equivalent to the image stored at the given filename in the testdata directory, with ".png" added to the filename if there is no extension (eg: "button" becomes "testdata/button.png"). If it is not, it fails the test with an error, but continues its execution. If there is no image at the given filename in the testdata directory, it creates the image.
func Capture ¶
Capture tells the app drawer to capture its next frame as an image. Once it gets that image, it returns it. It is currently only supported on platform Offscreen.
func CaptureAs ¶
CaptureAs is a helper function that saves the result of Capture to the given filename. It automatically logs any error in addition to returning it.
func CrashLogText ¶
CrashLogText returns an appropriate crash log string for the given recover value and stack trace.
func HandleRecoverBase ¶
func HandleRecoverBase(r any)
HandleRecoverBase is the default base value of HandleRecover. It can be extended to form a different value of HandleRecover. It prints a panic message and a stack trace, using a string-based log method that guarantees that the stack trace will be printed before the program exits. This is needed because, without this, the program may exit before it can print the stack trace on some systems like Android, which makes debugging nearly impossible. It also saves a crash log to [App.AppDataDir].
func HandleRecoverPanic ¶
func HandleRecoverPanic(r any)
HandleRecoverPanic panics on r if r is non-nil and [TheApp.Platform] is not mobile. This is because panicking screws up logging on mobile, but is necessary for debugging on desktop.
func LogicalFromPhysicalDPI ¶
LogicalFromPhysicalDPI computes the logical DPI used in actual screen scaling based on the given logical DPI scale factor (logScale), and also makes it a multiple of 6 to make normal font sizes look best.
func SetLogicalDPIScale ¶
SetLogicalDPIScale sets the LogicalDPIScale factor for given screen name
func WindowFlagsToBool ¶
func WindowFlagsToBool(flags WindowFlags) (dialog, modal, tool, fullscreen bool)
Types ¶
type App ¶
type App interface { // Platform returns the platform type, which can be used // for conditionalizing behavior Platform() Platforms // SystemPlatform returns the platform type of the underlying // system, which can be used for conditionalizing behavior. On platforms // other than [Web], this is the same as [App.Platform]. On [Web], it // returns the platform of the underlying operating system. SystemPlatform() Platforms // SystemInfo returns any additional information about the underlying system // that is not otherwise given. It is used in crash logs. SystemInfo() string // Name is the overall name of the application -- used for specifying an // application-specific preferences directory, etc Name() string // SetName sets the application name -- defaults to Cogent Core if not otherwise set SetName(name string) // GetScreens gets the current list of screens GetScreens() // NScreens returns the number of different logical and/or physical // screens managed under this overall screen hardware NScreens() int // Screen returns screen for given screen number, or nil if not a // valid screen number. Screen(n int) *Screen // ScreenByName returns screen for given screen name, or nil if not a // valid screen name. ScreenByName(name string) *Screen // NWindows returns the number of windows open for this app. NWindows() int // Window returns given window in list of windows opened under this screen // -- list is not in any guaranteed order, but typically in order of // creation (see also WindowByName) -- returns nil for invalid index. Window(win int) Window // WindowByName returns given window in list of windows opened under this // screen, by name -- nil if not found. WindowByName(name string) Window // WindowInFocus returns the window currently in focus (receiving keyboard // input) -- could be nil if none are. WindowInFocus() Window // ContextWindow returns the window passed as context for clipboard, cursor, etc calls. ContextWindow() Window // NewWindow returns a new Window for this screen. A nil opts is valid and // means to use the default option values. NewWindow(opts *NewWindowOptions) (Window, error) // RemoveWindow removes the given Window from the app's list of windows. // It does not actually close it; see [Window.Close] for that. RemoveWindow(win Window) // Clipboard returns the [Clipboard] handler for the system, // in context of given window, which is optional (can be nil) // but can provide useful context on some systems. Clipboard(win Window) Clipboard // Cursor returns the [Cursor] handler for the system, in the context // of the given window. Cursor(win Window) Cursor // DataDir returns the OS-specific data directory: Mac: ~/Library, // Linux: ~/.config, Windows: ~/AppData/Roaming DataDir() string // AppDataDir returns the application-specific data directory: [App.DataDir] + // [App.Name]. It ensures that the directory exists first. AppDataDir() string // CogentCoreDataDir returns the Cogent Core data directory: [App.DataDir] + // "Cogent Core". It ensures that the directory exists first. CogentCoreDataDir() string // OpenURL opens the given URL in the user's default browser. On Linux // this requires that xdg-utils package has been installed, since it uses // the xdg-open command. OpenURL(url string) // OpenFiles returns file names that have been set to be open at startup. OpenFiles() []string // SetQuitReqFunc sets the function that is called whenever there is a // request to quit the app (via a OS or a call to QuitReq() method). That // function can then adjudicate whether and when to actually call Quit. SetQuitReqFunc(fun func()) // AddQuitCleanFunc adds the given function to a list that is called whenever // app is actually about to quit (irrevocably). Can do any necessary // last-minute cleanup here. AddQuitCleanFunc(fun func()) // QuitReq is a quit request, triggered either by OS or user call (e.g., // via Quit menu action) -- calls function previously registered by // SetQuitReqFunc, which is then solely responsible for actually calling // Quit. QuitReq() // IsQuitting returns true when the app is actually quitting -- it is set // to true just before the QuitClean function is called, and before all // the windows are closed. IsQuitting() bool // QuitClean calls the function setup in SetQuitCleanFunc and does other // app cleanup -- called on way to quitting. If it returns false, then // the app should not quit. QuitClean() bool // Quit closes all windows and exits the program. Quit() // MainLoop runs the main loop of the app. MainLoop() // RunOnMain runs given function on main thread (where [App.MainLoop] is running). // Some functions (GUI-specific etc) must run on this initial main thread for the // overall app. If [App.MainLoop] has not been called yet, RunOnMain assumes that // it is being called from the main thread and thus just calls the given function // directly. RunOnMain(f func()) // SendEmptyEvent sends an empty, blank event to global event processing // system, which has the effect of pushing the system along during cases when // the event loop needs to be "pinged" to get things moving along. // See also similar method on Window. SendEmptyEvent() // ShowVirtualKeyboard shows a virtual keyboard of the given type. // ShowVirtualKeyboard only has an effect on mobile platforms (iOS, Android, and Web). // It should not be called with [styles.NoKeyboard]. ShowVirtualKeyboard(typ styles.VirtualKeyboards) // HideVirtualKeyboard hides the virtual keyboard. // HideVirtualKeyboard only has an effect on mobile platforms (iOS, Android, and Web). HideVirtualKeyboard() // IsDark returns whether the system color theme is dark (as oppposed to light). IsDark() bool }
App represents the overall OS GUI hardware, and creates Images, Textures and Windows, appropriate for that hardware / OS, and maintains data about the physical screen(s)
type Clipboard ¶
type Clipboard interface { // IsEmpty returns true if there is nothing on the clipboard to read. // Can be used for disabling a Paste menu. IsEmpty() bool // Read attempts to read data of the given MIME type(s), in preference // order, from the clipboard, returning mimedata.Mimes which can // potentially have multiple types / multiple items, etc. If the first type // listed is a text type, then text-based retrieval is assumed; always // put the most specific desired type first; anything else present will // be returned Read(types []string) mimedata.Mimes // Write writes given mimedata to the clipboard; in general having a // text/plain representation of the data in addition to a more specific // format is a good idea for anything more complex than plain text; if // data has > 1 element, it is all encoded as a multipart MIME text string Write(data mimedata.Mimes) error // Clear clears the clipboard. Clear() }
Clipboard defines the methods for reading and writing data to the system clipboard, which use mimedata to represent the data. Due to limitations of Windows (and Linux to a lesser extent), a multipart MIME formatted string is used if there are multiple elements in the mimedata, with any binary data text-encoded using base64.
type ClipboardBase ¶
type ClipboardBase struct{}
ClipboardBase is a basic implementation of Clipboard that does nothing.
func (*ClipboardBase) Clear ¶
func (bb *ClipboardBase) Clear()
func (*ClipboardBase) IsEmpty ¶
func (bb *ClipboardBase) IsEmpty() bool
type Cursor ¶
type Cursor interface { // Current returns the current cursor as an enum, which is a // [cogentcore.org/core/cursors.Cursor] // by default, but could be something else if you are extending // the default cursor set. Current() enums.Enum // Set sets the active cursor to the given cursor as an enum, which is typically // a [cursors.Cursor], unless you are extending the default cursor set, in // which case it should be a type you defined. The string version of the // enum value must correspond to a filename of the form "name.svg" in // [cogentcore.org/core/cursors.Cursors]; this will be satisfied automatically by all // [cursor.Cursor] values. Set(cursor enums.Enum) error // IsVisible returns whether cursor is currently visible (according to [Cursor.Hide] and [Cursor.Show] actions) IsVisible() bool // Hide hides the cursor if it is not already hidden. Hide() // Show shows the cursor after a hide if it is hidden. Show() // SetSize sets the size that cursors are rendered at. SetSize(size int) }
Cursor manages the mouse cursor / pointer appearance.
type CursorBase ¶
type CursorBase struct { // Cur is the current cursor, which is maintained by the standard methods. Cur enums.Enum // Vis is whether the cursor is visible; be sure to initialize to true! Vis bool // Size is the size that cursors are rendered at Size int }
CursorBase provides the common infrastructure for the Cursor interface, to be extended on desktop platforms. It can also be used as an empty implementation of the Cursor interface on mobile platforms, as they do not have cursors.
func (*CursorBase) Current ¶
func (c *CursorBase) Current() enums.Enum
func (*CursorBase) Hide ¶
func (c *CursorBase) Hide()
func (*CursorBase) IsVisible ¶
func (c *CursorBase) IsVisible() bool
func (*CursorBase) SetSize ¶
func (c *CursorBase) SetSize(size int)
func (*CursorBase) Show ¶
func (c *CursorBase) Show()
type Drawer ¶
type Drawer interface { // SetMaxTextures updates the max number of textures for drawing // Must call this prior to doing any allocation of images. SetMaxTextures(maxTextures int) // MaxTextures returns the max number of textures for drawing MaxTextures() int // DestBounds returns the bounds of the render destination DestBounds() image.Rectangle // SetGoImage sets given Go image as a drawing source to given image index, // and layer, used in subsequent Draw methods. // A standard Go image is rendered upright on a standard surface. // Set flipY to true to flip. SetGoImage(idx, layer int, img image.Image, flipY bool) // ConfigImageDefaultFormat configures the draw image at the given index // to fit the default image format specified by the given width, height, // and number of layers. ConfigImageDefaultFormat(idx int, width int, height int, layers int) // SyncImages must be called after images have been updated, to sync // memory up to the GPU. SyncImages() // Copy copies texture at given index and layer to render target. // dp is the destination point, // sr is the source region (set to image.ZR zero rect for all), // op is the drawing operation: Src = copy source directly (blit), // Over = alpha blend with existing // flipY = flipY axis when drawing this image Copy(idx, layer int, dp image.Point, sr image.Rectangle, op draw.Op, flipY bool) error // Scale copies texture at given index and layer to render target, // scaling the region defined by src and sr to the destination // such that sr in src-space is mapped to dr in dst-space. // dr is the destination rectangle // sr is the source region (set to image.ZR zero rect for all), // op is the drawing operation: Src = copy source directly (blit), // Over = alpha blend with existing // flipY = flipY axis when drawing this image // rotDeg = rotation degrees to apply in the mapping, e.g., 90 // rotates 90 degrees to the left, -90 = right. Scale(idx, layer int, dr image.Rectangle, sr image.Rectangle, op draw.Op, flipY bool, rotDeg float32) error // UseTextureSet selects the descriptor set to use -- // choose this based on the bank of 16 // texture values if number of textures > MaxTexturesPerSet. UseTextureSet(descIndex int) // StartDraw starts image drawing rendering process on render target // No images can be added or set after this point. // descIndex is the descriptor set to use -- choose this based on the bank of 16 // texture values if number of textures > MaxTexturesPerSet. // It returns false if rendering can not proceed. StartDraw(descIndex int) bool // EndDraw ends image drawing rendering process on render target EndDraw() // Fill fills given color to to render target. // src2dst is the transform mapping source to destination // coordinates (translation, scaling), // reg is the region to fill // op is the drawing operation: Src = copy source directly (blit), // Over = alpha blend with existing Fill(clr color.Color, src2dst math32.Matrix3, reg image.Rectangle, op draw.Op) error // StartFill starts color fill drawing rendering process on render target // It returns false if rendering can not proceed. StartFill() bool // EndFill ends color filling rendering process on render target EndFill() // Surface is the vgpu device being drawn to. // Could be nil on unsupported devices (web). Surface() any // SetFrameImage does direct rendering from a *vgpu.Framebuffer image. // This is much more efficient for GPU-resident images, as in 3D or video. SetFrameImage(idx int, fb any) }
Drawer is an interface representing a type capable of high-performance rendering to a window surface. It is implemented by *cogentcore.org/core/vgpu/vdraw.Drawer and internal web and offscreen drivers.
type DrawerBase ¶
type DrawerBase struct { // MaxTxts is the max number of textures MaxTxts int // Image is the target render image Image *image.RGBA // Images is a stack of images indexed by render scene index and then layer number Images [][]*image.RGBA }
DrawerBase is a base implementation of Drawer with basic no-ops for most methods. Embedders need to implement DestBounds and EndDraw.
func (*DrawerBase) ConfigImageDefaultFormat ¶
func (dw *DrawerBase) ConfigImageDefaultFormat(idx int, width int, height int, layers int)
ConfigImageDefaultFormat configures the draw image at the given index to fit the default image format specified by the given width, height, and number of layers.
func (*DrawerBase) Copy ¶
func (dw *DrawerBase) Copy(idx, layer int, dp image.Point, sr image.Rectangle, op draw.Op, flipY bool) error
Copy copies texture at given index and layer to render target. dp is the destination point, sr is the source region (set to image.ZR zero rect for all), op is the drawing operation: Src = copy source directly (blit), Over = alpha blend with existing flipY = flipY axis when drawing this image
func (*DrawerBase) EndFill ¶
func (dw *DrawerBase) EndFill()
EndFill ends color filling rendering process on render target
func (*DrawerBase) Fill ¶
func (dw *DrawerBase) Fill(clr color.Color, src2dst math32.Matrix3, reg image.Rectangle, op draw.Op) error
Fill fills given color to to render target. src2dst is the transform mapping source to destination coordinates (translation, scaling), reg is the region to fill op is the drawing operation: Src = copy source directly (blit), Over = alpha blend with existing
func (*DrawerBase) MaxTextures ¶
func (dw *DrawerBase) MaxTextures() int
MaxTextures returns the max number of textures for drawing
func (*DrawerBase) Scale ¶
func (dw *DrawerBase) Scale(idx, layer int, dr image.Rectangle, sr image.Rectangle, op draw.Op, flipY bool, rotDeg float32) error
Scale copies texture at given index and layer to render target, scaling the region defined by src and sr to the destination such that sr in src-space is mapped to dr in dst-space. dr is the destination rectangle sr is the source region (set to image.ZR zero rect for all), op is the drawing operation: Src = copy source directly (blit), Over = alpha blend with existing flipY = flipY axis when drawing this image rotDeg = rotation degrees to apply in the mapping, e.g., 90 rotates 90 degrees to the left, -90 = right.
func (*DrawerBase) SetFrameImage ¶
func (dw *DrawerBase) SetFrameImage(idx int, fb any)
SetFrameImage does direct rendering from a *vgpu.Framebuffer image. This is much more efficient for GPU-resident images, as in 3D or video.
func (*DrawerBase) SetGoImage ¶
func (dw *DrawerBase) SetGoImage(idx, layer int, img image.Image, flipY bool)
SetGoImage sets given Go image as a drawing source to given image index, and layer, used in subsequent Draw methods. A standard Go image is rendered upright on a standard surface. Set flipY to true to flip.
func (*DrawerBase) SetMaxTextures ¶
func (dw *DrawerBase) SetMaxTextures(maxTextures int)
SetMaxTextures updates the max number of textures for drawing Must call this prior to doing any allocation of images.
func (*DrawerBase) StartDraw ¶
func (dw *DrawerBase) StartDraw(descIndex int) bool
StartDraw starts image drawing rendering process on render target No images can be added or set after this point. descIndex is the descriptor set to use -- choose this based on the bank of 16 texture values if number of textures > MaxTexturesPerSet. This is a no-op on DrawerBase; if rendering logic is done here instead of EndDraw, everything is delayed by one render because Scale and Copy are called after StartDraw but before EndDraw, and we need them to be called before actually rendering the image to the capture channel. It returns false if rendering can not proceed.
func (*DrawerBase) StartFill ¶
func (dw *DrawerBase) StartFill() bool
StartFill starts color fill drawing rendering process on render target. It returns false if rendering can not proceed.
func (*DrawerBase) Surface ¶
func (dw *DrawerBase) Surface() any
func (*DrawerBase) SyncImages ¶
func (dw *DrawerBase) SyncImages()
SyncImages must be called after images have been updated, to sync memory up to the GPU.
func (*DrawerBase) UseTextureSet ¶
func (dw *DrawerBase) UseTextureSet(descIndex int)
UseTextureSet selects the descriptor set to use -- choose this based on the bank of 16 texture values if number of textures > MaxTexturesPerSet.
type NewWindowOptions ¶
type NewWindowOptions struct { // Size specifies the dimensions of the new window, either in raw pixels // or std 96 dpi pixels depending on StdPixels. If Width or Height are // zero, a driver-dependent default will be used for each zero value // dimension Size image.Point // StdPixels means use standardized "pixel" units for the window size (96 // per inch), not the actual underlying raw display dot pixels StdPixels bool // Pos specifies the position of the window, if non-zero -- always in // device-specific raw pixels Pos image.Point // Title specifies the window title. Title string // Icon specifies the window icon (see [Window.SetIcon] for more info). Icon []image.Image // Flags can be set using WindowFlags to request different types of windows Flags WindowFlags }
NewWindowOptions are optional arguments to NewWindow.
func (*NewWindowOptions) Fixup ¶
func (o *NewWindowOptions) Fixup()
Fixup fills in defaults and updates everything based on current screen and window context Specific hardware can fine-tune this as well, in driver code
func (*NewWindowOptions) GetTitle ¶
func (o *NewWindowOptions) GetTitle() string
GetTitle returns a sanitized form of o.Title. In particular, its length will not exceed 4096, and it may be further truncated so that it is valid UTF-8 and will not contain the NUL byte.
o may be nil, in which case "" is returned.
func (*NewWindowOptions) SetDialog ¶
func (o *NewWindowOptions) SetDialog()
func (*NewWindowOptions) SetFullscreen ¶
func (o *NewWindowOptions) SetFullscreen()
func (*NewWindowOptions) SetModal ¶
func (o *NewWindowOptions) SetModal()
func (*NewWindowOptions) SetTool ¶
func (o *NewWindowOptions) SetTool()
type Platforms ¶
type Platforms int32 //enums:enum
Platforms are all the supported platforms for system
const ( // MacOS is a Mac OS machine (aka Darwin) MacOS Platforms = iota // Linux is a Linux OS machine Linux // Windows is a Microsoft Windows machine Windows // IOS is an Apple iOS or iPadOS mobile phone or iPad IOS // Android is an Android mobile phone or tablet Android // Web is a web browser running the app through WASM Web // Offscreen is an offscreen driver typically used for testing, // specified using the "offscreen" build tag Offscreen )
const PlatformsN Platforms = 7
PlatformsN is the highest valid value for type Platforms, plus one.
func PlatformsValues ¶
func PlatformsValues() []Platforms
PlatformsValues returns all possible values for the type Platforms.
func (Platforms) IsMobile ¶
IsMobile returns whether the platform is a mobile platform (iOS, Android, Web, or Offscreen). Web and Offscreen are considered mobile platforms because they only support one window.
func (Platforms) MarshalText ¶
MarshalText implements the encoding.TextMarshaler interface.
func (*Platforms) SetString ¶
SetString sets the Platforms value from its string representation, and returns an error if the string is invalid.
func (*Platforms) UnmarshalText ¶
UnmarshalText implements the encoding.TextUnmarshaler interface.
type Screen ¶
type Screen struct { // ScreenNumber is the index of this screen in the list of screens // maintained under Screen. ScreenNumber int // Geometry contains the geometry of the screen in window manager // size units, which may not be same as raw pixels (dots) Geometry image.Rectangle // DevicePixelRatio is a factor that scales the screen's // "natural" pixel coordinates into actual device pixels. // On OS-X, it is backingScaleFactor = 2.0 on "retina" DevicePixelRatio float32 // PixSize is the number of actual pixels in the screen // (raw display dots), computed as Size * DevicePixelRatio PixSize image.Point // PhysicalSize is the actual physical size of the screen, in mm. PhysicalSize image.Point // LogicalDPI is the logical dots per inch of the screen, // which is used for all rendering. // It is: transient zoom factor * screen-specific multiplier * PhysicalDPI LogicalDPI float32 // PhysicalDPI is the physical dots per inch of the screen, // for generating true-to-physical-size output. // It is computed as 25.4 * (PixSize.X / PhysicalSize.X) // where 25.4 is the number of mm per inch. PhysicalDPI float32 // Color depth of the screen, in bits. Depth int // Refresh rate in Hz RefreshRate float32 Orientation ScreenOrientation NativeOrientation ScreenOrientation PrimaryOrientation ScreenOrientation Name string Manufacturer string Model string SerialNumber string }
Screen contains data about each physical and / or logical screen
func (*Screen) ConstrainWinGeom ¶
ConstrainWinGeom constrains window geometry to fit in the screen. Size is in pixel units.
func (*Screen) UpdateLogicalDPI ¶
func (sc *Screen) UpdateLogicalDPI()
UpdateLogicalDPI updates the logical DPI of the screen based on ZoomFactor and LogicalDPIScale (per screen if exists)
func (*Screen) UpdatePhysicalDPI ¶
func (sc *Screen) UpdatePhysicalDPI()
UpdatePhysicalDPI updates the value of [Screen.PhysicalDPI] based on [Screen.PixSize] and [Screen.PhysicalSize]
func (*Screen) WinSizeFromPix ¶
WinSizeFromPix returns window manager size units (where DevicePixelRatio is ignored) converted from pixel units -- i.e., divide by DevicePixelRatio
type ScreenOrientation ¶
type ScreenOrientation int32 //enums:enum
ScreenOrientation is the orientation of the device screen.
const ( // OrientationUnknown means device orientation cannot be determined. // // Equivalent on Android to Configuration.ORIENTATION_UNKNOWN // and on iOS to: // UIDeviceOrientationUnknown // UIDeviceOrientationFaceUp // UIDeviceOrientationFaceDown OrientationUnknown ScreenOrientation = iota // Portrait is a device oriented so it is tall and thin. // // Equivalent on Android to Configuration.ORIENTATION_PORTRAIT // and on iOS to: // UIDeviceOrientationPortrait // UIDeviceOrientationPortraitUpsideDown Portrait // Landscape is a device oriented so it is short and wide. // // Equivalent on Android to Configuration.ORIENTATION_LANDSCAPE // and on iOS to: // UIDeviceOrientationLandscapeLeft // UIDeviceOrientationLandscapeRight Landscape )
const ScreenOrientationN ScreenOrientation = 3
ScreenOrientationN is the highest valid value for type ScreenOrientation, plus one.
func ScreenOrientationValues ¶
func ScreenOrientationValues() []ScreenOrientation
ScreenOrientationValues returns all possible values for the type ScreenOrientation.
func (ScreenOrientation) Desc ¶
func (i ScreenOrientation) Desc() string
Desc returns the description of the ScreenOrientation value.
func (ScreenOrientation) Int64 ¶
func (i ScreenOrientation) Int64() int64
Int64 returns the ScreenOrientation value as an int64.
func (ScreenOrientation) MarshalText ¶
func (i ScreenOrientation) MarshalText() ([]byte, error)
MarshalText implements the encoding.TextMarshaler interface.
func (*ScreenOrientation) SetInt64 ¶
func (i *ScreenOrientation) SetInt64(in int64)
SetInt64 sets the ScreenOrientation value from an int64.
func (*ScreenOrientation) SetString ¶
func (i *ScreenOrientation) SetString(s string) error
SetString sets the ScreenOrientation value from its string representation, and returns an error if the string is invalid.
func (ScreenOrientation) String ¶
func (i ScreenOrientation) String() string
String returns the string representation of this ScreenOrientation value.
func (*ScreenOrientation) UnmarshalText ¶
func (i *ScreenOrientation) UnmarshalText(text []byte) error
UnmarshalText implements the encoding.TextUnmarshaler interface.
func (ScreenOrientation) Values ¶
func (i ScreenOrientation) Values() []enums.Enum
Values returns all possible values for the type ScreenOrientation.
type Window ¶
type Window interface { // Name returns the name of the window -- name is used strictly for // internal tracking and finding of windows -- see Title for the displayed // title of the window. Name() string // SetName sets the name of the window. SetName(name string) // Title returns the current title of the window, which is displayed in the GUI. Title() string // SetTitle sets the current title of the window, which is displayed in the GUI. SetTitle(title string) // SetIcon sets the icon of the window, which is displayed in the title bar // and taskbar on Windows. It takes a list of candidate images and uses the // one closest to the required size. Good sizes are 16x16, 32x32, and 48x48. SetIcon(images []image.Image) // Size returns the current size of the window, in raw underlying dots / pixels. // This includes any high DPI factors that may not be used in OS window sizing // (see WinSize for that size). Size() image.Point // WinSize returns the current size of the window, in OS-specific window manager // units that may not include any high DPI factors. WinSize() image.Point // Position returns the current left-top position of the window relative to // underlying screen, in OS-specific window manager coordinates. Position() image.Point // RenderGeom returns the actual effective geometry of the window used // for rendering content, which may be different from {0, [Window.Size]} // due to insets caused by things like status bars and button overlays. RenderGeom() math32.Geom2DInt // SetWinSize sets the size of the window, in OS-specific window manager // units that may not include any high DPI factors (DevPixRatio) // (i.e., the same units as returned in WinSize()) SetWinSize(sz image.Point) // SetSize sets the size of the window, in actual pixel units // (i.e., the same units as returned by Size()) // Divides by DevPixRatio before calling SetWinSize. SetSize(sz image.Point) // SetPos sets the position of the window, in OS window manager // coordinates, which may be different from Size() coordinates // that reflect high DPI SetPos(pos image.Point) // SetGeom sets the position and size in one call -- use this if doing // both because sequential calls to SetPos and SetSize might fail on some // platforms. Size is in actual pixel units (i.e., same units as returned by Size()), // and Pos is in OS-specific window manager units (i.e., as returned in Pos()) SetGeom(pos image.Point, sz image.Point) // Raise requests that the window be at the top of the stack of windows, // and receive focus. If it is iconified, it will be de-iconified. This // is the only supported mechanism for de-iconifying. Raise() // Minimize requests that the window be iconified, making it no longer // visible or active -- rendering should not occur for minimized windows. Minimize() // PhysicalDPI is the physical dots per inch of the window, for generating // true-to-physical-size output, for example -- see the gi/units package for // translating into various other units. PhysicalDPI() float32 // LogicalDPI returns the current logical dots-per-inch resolution of the // window, which should be used for most conversion of standard units -- // physical DPI can be found in the Screen. LogicalDPI() float32 // SetLogicalDPI sets the current logical dots-per-inch resolution of the // window, which should be used for most conversion of standard units -- // physical DPI can be found in the Screen. SetLogicalDPI(dpi float32) // Screen returns the screen for this window, with all the relevant // information about its properties. Screen() *Screen // Flags returns the bit flags for this window's properties set according // to WindowFlags bits. Flags() WindowFlags // Is returns whether the window has the given flag. Is(flag WindowFlags) bool // IsClosed returns true if this window has been closed (but some threads // may have not received the news yet) IsClosed() bool // IsVisible returns true if this window is not closed or minimized and // there are active screens IsVisible() bool // SetCloseReqFunc sets the function that is called whenever there is a // request to close the window (via a OS or a call to CloseReq() method). That // function can then adjudicate whether and when to actually call Close. SetCloseReqFunc(fun func(win Window)) // SetCloseCleanFunc sets the function that is called whenever window is // actually about to close (irrevocably) -- can do any necessary // last-minute cleanup here. SetCloseCleanFunc(fun func(win Window)) // CloseReq is a close request, triggered either by OS or user call (e.g., // via Close menu action) -- calls function previously registered by // SetCloseReqFunc, which is then solely responsible for actually calling // Close. CloseReq() // CloseClean calls the function setup in SetCloseCleanFunc and does other // window cleanup -- called on way to closing. CloseClean() // Close requests that the window be closed. The behavior of the Window // after this, whether calling its methods or passing it as an argument, // is undefined. See App.Quit methods to quit overall app. Close() // Sets the mouse position to given values SetMousePos(x, y float64) // Sets the mouse cursor to be enabled (true by default) or disabled (false). // If disabled, setting raw to true will enable raw mouse movement // which can provide better control in a game environment (not avail on Mac). SetCursorEnabled(enabled, raw bool) // IsCursorEnabled returns true or false if cursor is enabled IsCursorEnabled() bool // Drawer returns the drawing system attached to this window surface. // This is typically used for high-performance rendering to the surface. // Wrap access in Lock() / Unlock() calls. Drawer() Drawer // Lock attempts to grab the overall window Mutex lock // and returns true if the window is still open and ready for business. // Otherwise, it might have been closed and any further use should be // abandoned. Do this before any use of window resources // (eg. rendering to the Drawer). Lock() bool // Unlock unlocks the Mutex. Must be called after Lock() is done. Unlock() // SetDestroyGPUResourcesFunc sets the given function // that will be called on the main thread just prior // to destroying the drawer and surface. SetDestroyGPUResourcesFunc(f func()) // SetFPS sets the frames per second for Paint events that drive // updating of the window at regular intervals. 60 is default. // 0 disables -- no regular Paint events are sent. // This only takes effect prior to opening a new window. SetFPS(fps int) // SetTitleBarIsDark sets whether the color theme of the window // title bar is dark (as opposed to light). SetTitleBarIsDark(isDark bool) // Events returns the [events.Source] for this window, // which manages all of the event sending. Events() *events.Source }
Window is a double-buffered OS-specific hardware window.
It provides basic GPU support functions, and is currently implemented via Vulkan on top of glfw cross-platform window mgmt toolkit (see driver/desktop). using the vgpu framework.
The Window maintains its own vdraw.Drawer drawing system for rendering bitmap images and filled regions onto the window surface.
The base full-window image should be drawn with a Scale call first, followed by any overlay images such as sprites or direct upload images already on the GPU (e.g., from 3D render frames)
vgpu.MaxTexturesPerSet = 16 to work cross-platform, meaning that a maximum of 16 images per descriptor set can be uploaded and be ready to use in one render pass. core.Window uses multiple sets to get around this limitation.
type WindowFlags ¶
type WindowFlags int64 //enums:bitflag
WindowFlags contains all the binary properties of a window -- by default with no other relevant flags a window is a main top-level window.
const ( // Dialog indicates that this is a temporary, pop-up window. Dialog WindowFlags = iota // Modal indicates that this dialog window blocks events going to other // windows until it is closed. Modal // Tool indicates that this is a floating tool window that has minimized // window decoration. Tool // Fullscreen indicates a window that occupies the entire screen. Fullscreen // Minimized indicates a window reduced to an icon, or otherwise no longer // visible or active. Otherwise, the window should be assumed to be // visible. Minimized // Focused indicates that the window has the focus. Focused )
const WindowFlagsN WindowFlags = 6
WindowFlagsN is the highest valid value for type WindowFlags, plus one.
func WindowFlagsValues ¶
func WindowFlagsValues() []WindowFlags
WindowFlagsValues returns all possible values for the type WindowFlags.
func (WindowFlags) BitIndexString ¶
func (i WindowFlags) BitIndexString() string
BitIndexString returns the string representation of this WindowFlags value if it is a bit index value (typically an enum constant), and not an actual bit flag value.
func (WindowFlags) Desc ¶
func (i WindowFlags) Desc() string
Desc returns the description of the WindowFlags value.
func (WindowFlags) HasFlag ¶
func (i WindowFlags) HasFlag(f enums.BitFlag) bool
HasFlag returns whether these bit flags have the given bit flag set.
func (WindowFlags) Int64 ¶
func (i WindowFlags) Int64() int64
Int64 returns the WindowFlags value as an int64.
func (WindowFlags) MarshalText ¶
func (i WindowFlags) MarshalText() ([]byte, error)
MarshalText implements the encoding.TextMarshaler interface.
func (*WindowFlags) SetFlag ¶
func (i *WindowFlags) SetFlag(on bool, f ...enums.BitFlag)
SetFlag sets the value of the given flags in these flags to the given value.
func (*WindowFlags) SetInt64 ¶
func (i *WindowFlags) SetInt64(in int64)
SetInt64 sets the WindowFlags value from an int64.
func (*WindowFlags) SetString ¶
func (i *WindowFlags) SetString(s string) error
SetString sets the WindowFlags value from its string representation, and returns an error if the string is invalid.
func (*WindowFlags) SetStringOr ¶
func (i *WindowFlags) SetStringOr(s string) error
SetStringOr sets the WindowFlags value from its string representation while preserving any bit flags already set, and returns an error if the string is invalid.
func (WindowFlags) String ¶
func (i WindowFlags) String() string
String returns the string representation of this WindowFlags value.
func (*WindowFlags) UnmarshalText ¶
func (i *WindowFlags) UnmarshalText(text []byte) error
UnmarshalText implements the encoding.TextUnmarshaler interface.
func (WindowFlags) Values ¶
func (i WindowFlags) Values() []enums.Enum
Values returns all possible values for the type WindowFlags.
Source Files ¶
Directories ¶
Path | Synopsis |
---|---|
base
Package base provides base driver types that platform-specific drivers can extend to implement interfaces defined in package system.
|
Package base provides base driver types that platform-specific drivers can extend to implement interfaces defined in package system. |
mobile/mobileinit
Package mobileinit contains common initialization logic for mobile platforms that is relevant to both all-Go apps and gobind-based apps.
|
Package mobileinit contains common initialization logic for mobile platforms that is relevant to both all-Go apps and gobind-based apps. |
offscreen
Package offscreen provides placeholder implementations of system interfaces to allow for offscreen testing and capturing of apps.
|
Package offscreen provides placeholder implementations of system interfaces to allow for offscreen testing and capturing of apps. |
web
Package web implements system interfaces on the web through WASM
|
Package web implements system interfaces on the web through WASM |
web/jsfs
Package jsfs provides a Node.js style filesystem API in Go that can be used to allow os functions to work on wasm.
|
Package jsfs provides a Node.js style filesystem API in Go that can be used to allow os functions to work on wasm. |
examples
|
|