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simple_widget.go
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simple_widget.go
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package example
import (
"sync"
"fyne.io/fyne/v2"
"fyne.io/x/fyne/widget"
)
// SampleWidget is a sample widget demonstrating the base structure of a
// widget implementing SimpleWidget using SimpleWidgetBase.
type SampleWidget struct {
widget.SimpleWidgetBase
propertyLock sync.RWMutex
Property int
}
// NewSampleWidget creates a new sample widget.
func NewSampleWidget(property int) *SampleWidget {
wgt := &SampleWidget{Property: property}
wgt.ExtendBaseWidget(wgt)
return wgt
}
// Render renders the SampleWidget.
func (s *SampleWidget) Render() (objects []fyne.CanvasObject, layout func(size fyne.Size)) {
// create objects needed for rendering and append them to the objects slice.
// (executed in Widget.CreateRenderer function)
return objects, func(size fyne.Size) {
// position, resize or otherwise update objects. (executed in WidgetRenderer.Layout)
}
}
// SetStateSafe sets or changes the state of a widget in a safe way. A Refresh
// is triggered after the state changes have been applied.
func (s *SampleWidget) SetStateSafe(setState func()) {
s.SimpleWidgetBase.SetStateSafe(&s.propertyLock, setState)
}
func (s *SampleWidget) getProperty() int {
s.propertyLock.RLock()
defer s.propertyLock.RUnlock()
return s.Property
}
// All other methods of a fyne.Widget can be overwritten as usual. E.g. MinSize, Resize, Refresh, etc.