123 lines
2.6 KiB
Go
123 lines
2.6 KiB
Go
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package main
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import (
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"image/color"
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"log"
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"strings"
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"time"
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"opslag.de/schobers/geom"
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_ "opslag.de/schobers/zntg/addons/dragdrop" // import drag & drop functionality
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_ "opslag.de/schobers/zntg/sdlui" // import the renderer for the UI
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"opslag.de/schobers/zntg/ui"
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)
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type dropFiles struct {
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ui.StackPanel
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ctx ui.Context
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files *ui.Paragraph
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ping *ping
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}
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type ping struct {
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ui.OverlayBase
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circle ui.Texture
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position geom.PointF32
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over bool
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tick time.Time
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}
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func (p *ping) Render(ctx ui.Context) {
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elapsed := time.Since(p.tick)
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const animationDuration = 500 * time.Millisecond
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if elapsed > animationDuration {
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return
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}
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tint := color.Gray{Y: uint8(elapsed * 255 / animationDuration)}
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center := geom.PtF32(float32(p.circle.Width()), float32(p.circle.Height())).Mul(.5)
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ctx.Renderer().DrawTexturePointOptions(p.circle, p.position.Sub(center), ui.DrawOptions{Tint: tint})
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ctx.Animate()
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}
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func (d *dropFiles) Handle(ctx ui.Context, e ui.Event) bool {
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switch e := e.(type) {
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case *ui.DisplayDragMoveEnter:
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d.ping.tick = time.Now()
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d.ping.position = geom.PtF32(e.X, e.Y)
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d.ping.over = true
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d.ctx.Animate()
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return true
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case *ui.DisplayDropEvent:
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d.files.Text = "Files dropped:\n" + strings.Join(e.Files, "\n")
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d.ping.tick = time.Now()
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d.ping.position = geom.PtF32(e.X, e.Y)
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d.ping.over = false
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d.ctx.Animate()
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return true
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}
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return d.StackPanel.Handle(ctx, e)
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}
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func newCircle() ui.ImageSource {
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const side = 16
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center := geom.PtF32(.5*side, .5*side)
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return &ui.AlphaPixelImageSource{
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ImageAlphaPixelTestFn: func(p geom.PointF32) uint8 {
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dist := p.Distance(center)
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if dist < 7 {
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return 255
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} else if dist > 8 {
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return 0
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}
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return uint8((8 - dist) * 255 * 0.5)
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},
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Size: geom.Pt(side, side),
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}
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}
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func (d *dropFiles) Init(ctx ui.Context) error {
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d.ctx = ctx
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_, err := ctx.Fonts().CreateFontPath("default", "../resources/font/OpenSans-Regular.ttf", 14)
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if err != nil {
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return err
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}
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d.files = ui.BuildParagraph("", nil)
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pingCircle, err := ctx.Renderer().CreateTexture(newCircle())
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if err != nil {
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return err
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}
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d.ping = &ping{circle: pingCircle}
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ctx.Overlays().AddOnTop("ping", d.ping, true)
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d.Background = color.White
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d.Children = []ui.Control{
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&ui.Label{Text: "Drop files on this window!"},
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d.files,
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}
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return nil
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}
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func run() error {
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var render, err = ui.NewRendererDefault("Files Drop Example", 800, 600)
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if err != nil {
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return err
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}
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defer render.Destroy()
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return ui.RunWait(render, ui.DefaultStyle(), &dropFiles{}, true)
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}
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func main() {
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var err = run()
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if err != nil {
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log.Fatal(err)
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}
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}
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