80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
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package ui
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import "opslag.de/schobers/geom"
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type StackPanel struct {
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ContainerBase
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Orientation Orientation
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}
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func (p *StackPanel) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.PointF32) {
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bounds = p.Orientation.FlipRect(bounds)
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var length float32
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var stretch int
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var desired = make([]geom.PointF32, len(p.Children))
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for i, child := range p.Children {
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var size = p.Orientation.FlipPt(child.DesiredSize(ctx))
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if geom.IsNaN32(size.Y) {
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stretch++
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} else {
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length += size.Y
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}
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desired[i] = size
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}
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var remainder = bounds.Dy() - length
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var childOffset float32
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for i, size := range desired {
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var height = size.Y
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if geom.IsNaN32(size.Y) {
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if remainder < 0 {
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height = 0
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} else {
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height = remainder / float32(stretch)
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}
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} else if childOffset+height > bounds.Dy() {
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height = bounds.Dy() - childOffset
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}
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var child = geom.RectF32(bounds.Min.X, bounds.Min.Y+childOffset, bounds.Max.X, bounds.Min.Y+childOffset+height)
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p.Children[i].Arrange(ctx, p.Orientation.FlipRect(child), offset)
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childOffset += height
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}
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p.ControlBase.Arrange(ctx, p.Orientation.FlipRect(bounds), offset)
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}
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func (p *StackPanel) DesiredSize(ctx Context) geom.PointF32 {
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var length float32
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var width float32
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for _, child := range p.Children {
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var size = child.DesiredSize(ctx)
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var l, w = p.Orientation.LengthParallel(size), p.Orientation.LengthPerpendicular(size)
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if geom.IsNaN32(l) {
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length = l
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} else {
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if !geom.IsNaN32(length) {
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length += l
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}
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}
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if geom.IsNaN32(w) {
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width = w
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} else {
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if !geom.IsNaN32(width) {
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width = geom.Max32(width, w)
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}
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}
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}
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return p.Orientation.Pt(length, width)
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}
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func (p *StackPanel) Render(ctx Context) {
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p.RenderBackground(ctx)
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var bounds = p.Bounds()
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for _, child := range p.Children {
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var childB = child.Bounds()
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if childB.Min.X >= bounds.Max.X || childB.Min.Y >= bounds.Max.Y || childB.Max.X < bounds.Min.X || childB.Max.Y < bounds.Min.Y {
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continue
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}
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child.Render(ctx)
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}
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}
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