/
switch.go
147 lines (132 loc) · 3.6 KB
/
switch.go
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// SPDX-License-Identifier: Unlicense OR MIT
package material
import (
"image"
"image/color"
"github.com/cybriq/p9/pkg/gel/gio/f32"
"github.com/cybriq/p9/pkg/gel/gio/internal/f32color"
"github.com/cybriq/p9/pkg/gel/gio/io/pointer"
"github.com/cybriq/p9/pkg/gel/gio/layout"
"github.com/cybriq/p9/pkg/gel/gio/op"
"github.com/cybriq/p9/pkg/gel/gio/op/clip"
"github.com/cybriq/p9/pkg/gel/gio/op/paint"
"github.com/cybriq/p9/pkg/gel/gio/unit"
"github.com/cybriq/p9/pkg/gel/gio/widget"
)
type SwitchStyle struct {
Color struct {
Enabled color.NRGBA
Disabled color.NRGBA
Track color.NRGBA
}
Switch *widget.Bool
}
// Switch is for selecting a boolean value.
func Switch(th *Theme, swtch *widget.Bool) SwitchStyle {
sw := SwitchStyle{
Switch: swtch,
}
sw.Color.Enabled = th.Palette.ContrastBg
sw.Color.Disabled = th.Palette.Bg
sw.Color.Track = f32color.MulAlpha(th.Palette.Fg, 0x88)
return sw
}
// Layout updates the switch and displays it.
func (s SwitchStyle) Layout(gtx layout.Context) layout.Dimensions {
trackWidth := gtx.Px(unit.Dp(36))
trackHeight := gtx.Px(unit.Dp(16))
thumbSize := gtx.Px(unit.Dp(20))
trackOff := float32(thumbSize-trackHeight) * .5
// Draw track.
stack := op.Save(gtx.Ops)
trackCorner := float32(trackHeight) / 2
trackRect := f32.Rectangle{
Max: f32.Point{
X: float32(trackWidth),
Y: float32(trackHeight),
},
}
col := s.Color.Disabled
if s.Switch.Value {
col = s.Color.Enabled
}
if gtx.Queue == nil {
col = f32color.Disabled(col)
}
trackColor := s.Color.Track
op.Offset(f32.Point{Y: trackOff}).Add(gtx.Ops)
clip.UniformRRect(trackRect, trackCorner).Add(gtx.Ops)
paint.ColorOp{Color: trackColor}.Add(gtx.Ops)
paint.PaintOp{}.Add(gtx.Ops)
stack.Load()
// Draw thumb ink.
stack = op.Save(gtx.Ops)
inkSize := gtx.Px(unit.Dp(44))
rr := float32(inkSize) * .5
inkOff := f32.Point{
X: float32(trackWidth)*.5 - rr,
Y: -rr + float32(trackHeight)*.5 + trackOff,
}
op.Offset(inkOff).Add(gtx.Ops)
gtx.Constraints.Min = image.Pt(inkSize, inkSize)
clip.UniformRRect(
f32.Rectangle{Max: layout.FPt(gtx.Constraints.Min)},
rr,
).Add(gtx.Ops)
for _, p := range s.Switch.History() {
drawInk(gtx, p)
}
stack.Load()
// Compute thumb offset and color.
stack = op.Save(gtx.Ops)
if s.Switch.Value {
off := trackWidth - thumbSize
op.Offset(f32.Point{X: float32(off)}).Add(gtx.Ops)
}
thumbRadius := float32(thumbSize) / 2
// Draw hover.
if s.Switch.Hovered() {
r := 1.7 * thumbRadius
background := f32color.MulAlpha(s.Color.Enabled, 70)
paint.FillShape(
gtx.Ops, background,
clip.Circle{
Center: f32.Point{X: thumbRadius, Y: thumbRadius},
Radius: r,
}.Op(gtx.Ops),
)
}
// Draw thumb shadow, a translucent disc slightly larger than the
// thumb itself.
// Center shadow horizontally and slightly adjust its Y.
paint.FillShape(
gtx.Ops, argb(0x55000000),
clip.Circle{
Center: f32.Point{X: thumbRadius, Y: thumbRadius + .25},
Radius: thumbRadius + 1,
}.Op(gtx.Ops),
)
// Draw thumb.
paint.FillShape(
gtx.Ops, col,
clip.Circle{
Center: f32.Point{X: thumbRadius, Y: thumbRadius},
Radius: thumbRadius,
}.Op(gtx.Ops),
)
// Set up click area.
stack = op.Save(gtx.Ops)
clickSize := gtx.Px(unit.Dp(40))
clickOff := f32.Point{
X: (float32(trackWidth) - float32(clickSize)) * .5,
Y: (float32(trackHeight)-float32(clickSize))*.5 + trackOff,
}
op.Offset(clickOff).Add(gtx.Ops)
sz := image.Pt(clickSize, clickSize)
pointer.Ellipse(image.Rectangle{Max: sz}).Add(gtx.Ops)
gtx.Constraints.Min = sz
s.Switch.Layout(gtx)
stack.Load()
dims := image.Point{X: trackWidth, Y: thumbSize}
return layout.Dimensions{Size: dims}
}