54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
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package alui
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import (
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"opslag.de/schobers/geom"
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)
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var _ Control = &Margins{}
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type Margins struct {
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Proxy
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Top, Left, Bottom, Right float32
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bounds geom.RectangleF32
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}
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func NewMargins(target Control, margins ...float32) *Margins {
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m := &Margins{Proxy: Proxy{Target: target}}
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switch len(margins) {
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case 1:
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m.Top, m.Left, m.Bottom, m.Right = margins[0], margins[0], margins[0], margins[0]
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case 2:
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m.Top, m.Left, m.Bottom, m.Right = margins[0], margins[1], margins[0], margins[1]
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case 3:
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m.Top, m.Left, m.Bottom, m.Right = margins[0], margins[1], margins[2], margins[1]
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case 4:
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m.Top, m.Left, m.Bottom, m.Right = margins[0], margins[1], margins[2], margins[3]
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default:
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panic("expected 1 (all same), 2 (vertical, horizontal), 3 (top, horizontal, bottom) or 4 margins (all separately specified)")
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}
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return m
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}
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func (m *Margins) Bounds() geom.RectangleF32 { return m.bounds }
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func (m *Margins) DesiredSize(ctx *Context) geom.PointF32 {
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return m.Proxy.DesiredSize(ctx).Add2D(m.Left+m.Right, m.Top+m.Bottom)
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}
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func (m *Margins) inset(bounds geom.RectangleF32) geom.RectangleF32 {
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return geom.RectF32(bounds.Min.X+m.Left, bounds.Min.Y+m.Top, bounds.Max.X-m.Right, bounds.Max.Y-m.Bottom)
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}
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func (m *Margins) Layout(ctx *Context, bounds geom.RectangleF32) {
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m.bounds = bounds
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target := m.inset(bounds)
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m.Proxy.Layout(ctx, target)
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}
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func (m *Margins) Render(ctx *Context, bounds geom.RectangleF32) {
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target := m.inset(bounds)
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m.Proxy.Render(ctx, target)
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}
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