31 lines
1.2 KiB
Go
31 lines
1.2 KiB
Go
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package fyne
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// Widget defines the standard behaviours of any widget. This extends the
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// CanvasObject - a widget behaves in the same basic way but will encapsulate
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// many child objects to create the rendered widget.
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type Widget interface {
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CanvasObject
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// CreateRenderer returns a new WidgetRenderer for this widget.
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// This should not be called by regular code, it is used internally to render a widget.
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CreateRenderer() WidgetRenderer
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}
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// WidgetRenderer defines the behaviour of a widget's implementation.
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// This is returned from a widget's declarative object through the CreateRenderer()
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// function and should be exactly one instance per widget in memory.
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type WidgetRenderer interface {
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// Destroy is for internal use.
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Destroy()
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// Layout is a hook that is called if the widget needs to be laid out.
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// This should never call Refresh.
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Layout(Size)
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// MinSize returns the minimum size of the widget that is rendered by this renderer.
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MinSize() Size
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// Objects returns all objects that should be drawn.
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Objects() []CanvasObject
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// Refresh is a hook that is called if the widget has updated and needs to be redrawn.
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// This might trigger a Layout.
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Refresh()
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}
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