zntg/ui/button.go

package ui

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

type Button struct {
	ControlBase

	Text string
}

func BuildButton(text string, factory func(b *Button)) *Button {
	var b = &Button{Text: text}
	factory(b)
	return b
}

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

func (b *Button) Handle(ctx Context, e Event) {
	b.ControlBase.Handle(ctx, e)
	if b.over {
		ctx.Renderer().SetMouseCursor(MouseCursorPointer)
	}
}

func (b *Button) Render(ctx Context) {
	var fore = b.Font.Color
	var style = ctx.Style()
	if fore == nil {
		fore = style.Palette.TextOnPrimary
	}
	var fill = style.Palette.Primary
	if b.over {
		fill = style.Palette.PrimaryHighlight
	}
	var pad = style.Dimensions.TextPadding
	var font = b.FontName(ctx)
	ctx.Renderer().FillRectangle(b.bounds, fill)
	ctx.Renderer().Text(b.bounds.Min.Add(geom.PtF32(pad, pad)), font, fore, b.Text)
}