~eliasnaur/gio

ref: 69dfd2e3a55419167975adc316f8126bc4737443 gio/widget/material/checkable.go -rw-r--r-- 1.5 KiB View raw
69dfd2e3Elias Naur op/paint: add support for efficient ImageOp subimages 4 months ago
                                                                                
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// SPDX-License-Identifier: Unlicense OR MIT

package material

import (
	"image"
	"image/color"

	"gioui.org/io/pointer"
	"gioui.org/layout"
	"gioui.org/op/paint"
	"gioui.org/text"
	"gioui.org/unit"
	"gioui.org/widget"
)

type checkable struct {
	Label              string
	Color              color.RGBA
	Font               text.Font
	TextSize           unit.Value
	IconColor          color.RGBA
	Size               unit.Value
	shaper             text.Shaper
	checkedStateIcon   *Icon
	uncheckedStateIcon *Icon
}

func (c *checkable) layout(gtx *layout.Context, checked bool) {

	var icon *Icon
	if checked {
		icon = c.checkedStateIcon
	} else {
		icon = c.uncheckedStateIcon
	}

	hmin := gtx.Constraints.Width.Min
	vmin := gtx.Constraints.Height.Min
	layout.Flex{Alignment: layout.Middle}.Layout(gtx,
		layout.Rigid(func() {
			layout.Center.Layout(gtx, func() {
				layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
					size := gtx.Px(c.Size)
					icon.Color = c.IconColor
					icon.Layout(gtx, unit.Px(float32(size)))
					gtx.Dimensions = layout.Dimensions{
						Size: image.Point{X: size, Y: size},
					}
				})
			})
		}),

		layout.Rigid(func() {
			gtx.Constraints.Width.Min = hmin
			gtx.Constraints.Height.Min = vmin
			layout.W.Layout(gtx, func() {
				layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
					paint.ColorOp{Color: c.Color}.Add(gtx.Ops)
					widget.Label{}.Layout(gtx, c.shaper, c.Font, c.TextSize, c.Label)
				})
			})
		}),
	)
	pointer.Rect(image.Rectangle{Max: gtx.Dimensions.Size}).Add(gtx.Ops)
}