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examples/subclass: show super() calls

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mappu 2024-11-19 19:28:40 +13:00
parent 40abeecd54
commit 0ff750727c
1 changed files with 28 additions and 11 deletions
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39
examples/subclass/main.go
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@ -7,20 +7,32 @@ import (
) )
func main() { func main() {
qt.NewQApplication(os.Args) qt.NewQApplication(os.Args)
qt.QGuiApplication_SetApplicationDisplayName("Right-click to change color")
widget := qt.NewQWidget2() w := qt.NewQGroupBox2() // qt.NewQw2()
widget.SetFixedWidth(320) w.SetTitle("QGroupBox title")
widget.SetFixedHeight(240)
widget.OnPaintEvent(func(ev *qt.QPaintEvent) { w.SetFixedWidth(320)
panic("xyz") w.SetFixedHeight(240)
w.SetMinimumHeight(100)
w.SetMinimumWidth(100)
ptr := qt.NewQPainter2(widget.QPaintDevice) useColors := []qt.GlobalColor{
qt.Black, qt.Red, qt.Green, qt.Blue,
}
currentColor := 0
w.OnPaintEvent(func(super func(ev *qt.QPaintEvent), ev *qt.QPaintEvent) {
// Call the base class's PaintEvent to get initial content
// (Comment this out to see the QGroupBox disappear)
super(ev)
// Then, draw on top of it
ptr := qt.NewQPainter2(w.QPaintDevice)
defer ptr.Delete() defer ptr.Delete()
br := qt.NewQBrush12(qt.Black, qt.SolidPattern) br := qt.NewQBrush12(useColors[currentColor], qt.SolidPattern)
defer br.Delete() defer br.Delete()
ptr.SetBrush(br) ptr.SetBrush(br)
@ -29,9 +41,14 @@ func main() {
ptr.End() ptr.End()
}) })
widget.Show() w.OnContextMenuEvent(func(super func(ev *qt.QContextMenuEvent), ev *qt.QContextMenuEvent) {
widget.Repaint() super(ev)
widget.Update()
currentColor = (currentColor + 1) % len(useColors)
w.Update() // repaints in next event loop tick
})
w.Show()
qt.QApplication_Exec() qt.QApplication_Exec()
} }