74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
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package alui
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import (
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"opslag.de/schobers/allg5"
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"opslag.de/schobers/geom"
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)
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type Control interface {
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Bounds() geom.RectangleF32
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Handle(allg5.Event)
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DesiredSize(*Context) geom.PointF32
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Layout(*Context, geom.RectangleF32)
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Render(*Context, geom.RectangleF32)
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}
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type Bounds struct {
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value geom.RectangleF32
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}
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var _ Control = &ControlBase{}
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type ControlBase struct {
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_Bounds geom.RectangleF32
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Over bool
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Font string
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Foreground *allg5.Color
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Background *allg5.Color
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OnClick func()
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OnEnter func()
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OnLeave func()
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}
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func MouseEventToPos(e allg5.MouseEvent) geom.PointF32 { return geom.PtF32(float32(e.X), float32(e.Y)) }
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func (b *ControlBase) DesiredSize(*Context) geom.PointF32 { return geom.ZeroPtF32 }
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func (b *ControlBase) Handle(e allg5.Event) {
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switch e := e.(type) {
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case *allg5.MouseMoveEvent:
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pos := MouseEventToPos(e.MouseEvent)
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over := pos.In(b._Bounds)
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if over != b.Over {
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b.Over = over
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if over {
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if b.OnEnter != nil {
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b.OnEnter()
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}
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} else {
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if b.OnLeave != nil {
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b.OnLeave()
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}
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}
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}
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case *allg5.MouseButtonDownEvent:
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if !b.Over {
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break
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}
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if e.Button == allg5.MouseButtonLeft {
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if b.OnClick != nil {
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b.OnClick()
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}
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}
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}
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}
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func (b *ControlBase) Layout(_ *Context, bounds geom.RectangleF32) { b._Bounds = bounds }
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func (b *ControlBase) Render(*Context, geom.RectangleF32) {}
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func (b *ControlBase) Bounds() geom.RectangleF32 { return b._Bounds }
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