78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
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package ui
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import (
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"opslag.de/schobers/galleg/allegro5"
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"opslag.de/schobers/geom"
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)
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type scroll struct {
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Wrapper
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Content Control
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Bar *ContentScrollbar
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}
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func Scroll(c Control, o Orientation) Control {
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var dock = NewDockPanel(nil)
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var bar = &ContentScrollbar{Orientation: o}
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switch o {
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case OrientationHorizontal:
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dock.Append(DockBottom, TopMargin(bar, ScrollbarWidth))
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dock.Append(DockBottom, c)
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case OrientationVertical:
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dock.Append(DockRight, LeftMargin(bar, ScrollbarWidth))
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dock.Append(DockRight, c)
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}
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var s = &scroll{Wrap(dock), c, bar}
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bar.OnChanged = func(v float64) {
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}
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return s
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}
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func (s *scroll) Handle(ctx Context, ev allegro5.Event) {
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s.Wrapper.Handle(ctx, ev)
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switch e := ev.(type) {
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case *allegro5.MouseMoveEvent:
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if 0 != e.DeltaZ && !s.Bar.IsOver && geom.PtF(float64(e.X), float64(e.Y)).In(s.Bounds) {
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var d = e.DeltaZ
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if allegro5.IsAnyKeyDown(allegro5.KeyLShift, allegro5.KeyRShift) {
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d *= 10
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}
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s.Bar.increment(d)
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}
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}
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}
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func (s *scroll) Render(ctx Context) {
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var bounds = s.Content.Rect()
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var w, h = bounds.Dx(), bounds.Dy()
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var bmp, err = allegro5.NewVideoBitmap(int(w), int(h))
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if nil != err {
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return
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}
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defer bmp.Destroy()
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bmp.SetAsTarget()
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switch s.Bar.Orientation {
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case OrientationHorizontal:
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Arrange(ctx, s.Content, geom.RectF(-s.Bar.Value, 0, w, h))
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case OrientationVertical:
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Arrange(ctx, s.Content, geom.RectF(0, -s.Bar.Value, w, h))
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}
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s.Content.Render(ctx)
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ctx.Display().SetAsTarget()
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var min = s.Bounds.Min.To32()
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bmp.Draw(min.X, min.Y)
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s.Bar.Render(ctx)
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}
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func (s *scroll) Arrange(ctx Context, rect geom.RectangleF) {
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var sz = s.Content.DesiredSize(ctx)
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switch s.Bar.Orientation {
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case OrientationHorizontal:
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s.Bar.Length = sz.X
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case OrientationVertical:
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s.Bar.Length = sz.Y
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}
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s.Wrapper.Arrange(ctx, rect)
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}
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