78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
package ui
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import (
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"image/color"
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"opslag.de/schobers/geom"
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)
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type TextOverflow int
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const (
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TextOverflowClip TextOverflow = iota
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TextOverflowEllipsis
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)
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type Label struct {
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ControlBase
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Text string
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TextOverflow TextOverflow
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DropShadow color.Color
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desired CachedValue
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}
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func BuildLabel(text string, fn func(*Label)) *Label {
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var l = &Label{Text: text}
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if fn != nil {
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fn(l)
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}
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return l
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}
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func (l *Label) hashDesiredSize(ctx Context) string {
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return l.FontName(ctx) + l.Text
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}
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func (l *Label) desiredSize(ctx Context) interface{} {
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font := l.ActualFont(ctx)
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width := font.WidthOf(l.Text)
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height := font.Height()
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pad := l.ActualTextPadding(ctx)
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return geom.PtF32(pad.Left+width+pad.Right, pad.Top+height+pad.Bottom)
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}
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func (l *Label) DesiredSize(ctx Context, _ geom.PointF32) geom.PointF32 {
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return l.desired.GetContext(ctx, l.desiredSize, l.hashDesiredSize).(geom.PointF32)
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}
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func (l *Label) getLabelTopLeft(ctx Context) geom.PointF32 {
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pad := l.ActualTextPadding(ctx)
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bounds := pad.InsetRect(l.bounds)
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switch l.TextAlignment {
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case AlignRight:
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return geom.PtF32(bounds.Max.X, bounds.Min.Y)
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case AlignCenter:
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return geom.PtF32(.5*(bounds.Min.X+bounds.Max.X), bounds.Min.Y)
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default:
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return bounds.Min
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}
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}
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func (l *Label) Render(ctx Context) {
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l.RenderBackground(ctx)
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fontColor := l.TextColor(ctx)
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font := l.ActualFont(ctx)
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topLeft := l.getLabelTopLeft(ctx)
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text := l.Text
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availableWidth := l.bounds.Dx()
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if l.TextOverflow == TextOverflowEllipsis {
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text = fitTextEllipsis(font, text, availableWidth)
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}
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if l.DropShadow != nil {
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ctx.Renderer().TextAlign(font, topLeft.Add2D(1, 1), l.DropShadow, text, l.TextAlignment)
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}
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ctx.Renderer().TextAlign(font, topLeft, fontColor, text, l.TextAlignment)
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}
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