zntg/ui/label.go

package ui

import (
	"opslag.de/schobers/geom"
)

type Label struct {
	ControlBase

	Text string

	size desiredSizeCache
}

func BuildLabel(text string, fn func(*Label)) *Label {
	var l = &Label{Text: text}
	if fn != nil {
		fn(l)
	}
	return l
}

func (l *Label) DesiredSize(ctx Context) geom.PointF32 {
	var fontName = l.FontName(ctx)
	return l.size.Update(ctx, fontName+l.Text, func(ctx Context) geom.PointF32 {
		var font = ctx.Renderer().Font(fontName)
		var width = font.WidthOf(l.Text)
		var height = font.Height()
		var pad = ctx.Style().Dimensions.TextPadding
		return geom.PtF32(width+pad*2, height+pad*2)
	})
}

func (l *Label) Render(ctx Context) {
	l.RenderBackground(ctx)
	var c = l.FontColor(ctx)
	var f = l.FontName(ctx)
	var pad = ctx.Style().Dimensions.TextPadding
	ctx.Renderer().TextAlign(l.bounds.Min.Add(geom.PtF32(pad, pad)), f, c, l.Text, l.TextAlignment)
}