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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build example
// +build example
//
// This build tag means that "go install golang.org/x/exp/shiny/..." doesn't
// install this example program. Use "go run main.go" to run it or "go install
// -tags=example" to install it.
// Widgetgallery exhibits the shiny/widget package's widget set.
package main
import (
"image"
"image/color"
"image/draw"
"log"
"golang.org/x/exp/shiny/driver"
"golang.org/x/exp/shiny/gesture"
"golang.org/x/exp/shiny/screen"
"golang.org/x/exp/shiny/widget"
"golang.org/x/exp/shiny/widget/node"
)
var uniforms = [...]*image.Uniform{
image.NewUniform(color.RGBA{0xbf, 0x00, 0x00, 0xff}),
image.NewUniform(color.RGBA{0x9f, 0x9f, 0x00, 0xff}),
image.NewUniform(color.RGBA{0x00, 0xbf, 0x00, 0xff}),
image.NewUniform(color.RGBA{0x00, 0x9f, 0x9f, 0xff}),
image.NewUniform(color.RGBA{0x00, 0x00, 0xbf, 0xff}),
image.NewUniform(color.RGBA{0x9f, 0x00, 0x9f, 0xff}),
}
// custom is a custom widget.
type custom struct {
node.LeafEmbed
index int
}
func newCustom() *custom {
w := &custom{}
w.Wrapper = w
return w
}
func (w *custom) OnInputEvent(e interface{}, origin image.Point) node.EventHandled {
switch e := e.(type) {
case gesture.Event:
if e.Type != gesture.TypeTap {
break
}
w.index++
if w.index == len(uniforms) {
w.index = 0
}
w.Mark(node.MarkNeedsPaintBase)
}
return node.Handled
}
func (w *custom) PaintBase(ctx *node.PaintBaseContext, origin image.Point) error {
w.Marks.UnmarkNeedsPaintBase()
draw.Draw(ctx.Dst, w.Rect.Add(origin), uniforms[w.index], image.Point{}, draw.Src)
return nil
}
func main() {
log.SetFlags(0)
driver.Main(func(s screen.Screen) {
// TODO: create a bunch of standard widgets: buttons, labels, etc.
w := widget.NewSheet(newCustom())
if err := widget.RunWindow(s, w, &widget.RunWindowOptions{
NewWindowOptions: screen.NewWindowOptions{
Title: "WidgetGallery Shiny Example",
},
}); err != nil {
log.Fatal(err)
}
})
}
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