59 lines
2.0 KiB
Go
59 lines
2.0 KiB
Go
|
package fyne
|
||
|
|
|
||
|
|
import "image"
|
||
|
|
|
||
|
|
// Canvas defines a graphical canvas to which a CanvasObject or Container can be added.
|
||
|
|
// Each canvas has a scale which is automatically applied during the render process.
|
||
|
|
type Canvas interface {
|
||
|
|
Content() CanvasObject
|
||
|
|
SetContent(CanvasObject)
|
||
|
|
|
||
|
|
Refresh(CanvasObject)
|
||
|
|
|
||
|
|
// Focus makes the provided item focused.
|
||
|
|
// The item has to be added to the contents of the canvas before calling this.
|
||
|
|
Focus(Focusable)
|
||
|
|
// FocusNext focuses the next focusable item.
|
||
|
|
// If no item is currently focused, the first focusable item is focused.
|
||
|
|
// If the last focusable item is currently focused, the first focusable item is focused.
|
||
|
|
//
|
||
|
|
// Since: 2.0
|
||
|
|
FocusNext()
|
||
|
|
// FocusPrevious focuses the previous focusable item.
|
||
|
|
// If no item is currently focused, the last focusable item is focused.
|
||
|
|
// If the first focusable item is currently focused, the last focusable item is focused.
|
||
|
|
//
|
||
|
|
// Since: 2.0
|
||
|
|
FocusPrevious()
|
||
|
|
Unfocus()
|
||
|
|
Focused() Focusable
|
||
|
|
|
||
|
|
// Size returns the current size of this canvas
|
||
|
|
Size() Size
|
||
|
|
// Scale returns the current scale (multiplication factor) this canvas uses to render
|
||
|
|
// The pixel size of a CanvasObject can be found by multiplying by this value.
|
||
|
|
Scale() float32
|
||
|
|
|
||
|
|
// Overlays returns the overlay stack.
|
||
|
|
Overlays() OverlayStack
|
||
|
|
|
||
|
|
OnTypedRune() func(rune)
|
||
|
|
SetOnTypedRune(func(rune))
|
||
|
|
OnTypedKey() func(*KeyEvent)
|
||
|
|
SetOnTypedKey(func(*KeyEvent))
|
||
|
|
AddShortcut(shortcut Shortcut, handler func(shortcut Shortcut))
|
||
|
|
RemoveShortcut(shortcut Shortcut)
|
||
|
|
|
||
|
|
Capture() image.Image
|
||
|
|
|
||
|
|
// PixelCoordinateForPosition returns the x and y pixel coordinate for a given position on this canvas.
|
||
|
|
// This can be used to find absolute pixel positions or pixel offsets relative to an object top left.
|
||
|
|
PixelCoordinateForPosition(Position) (int, int)
|
||
|
|
|
||
|
|
// InteractiveArea returns the position and size of the central interactive area.
|
||
|
|
// Operating system elements may overlap the portions outside this area and widgets should avoid being outside.
|
||
|
|
//
|
||
|
|
// Since: 1.4
|
||
|
|
InteractiveArea() (Position, Size)
|
||
|
|
}
|