83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
package ui
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import (
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"flag"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/inpututil"
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)
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var (
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winX = flag.Int("win-x", 1280, "width of the view-map window")
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winY = flag.Int("win-y", 1024, "height of the view-map window")
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)
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type Window struct {
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Title string
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KeyUpHandlers map[ebiten.Key]func()
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MouseWheelHandler func(float64, float64)
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// User-provided update actions
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updateFn func() error
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drawFn func(*ebiten.Image) error
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}
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// 0,0 is the *top left* of the window
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//
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// ebiten assumes a single window, so only call this once...
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func NewWindow(title string) (*Window, error) {
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return &Window{
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Title: title,
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KeyUpHandlers: make(map[ebiten.Key]func()),
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}, nil
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}
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// TODO: multiple handlers for the same key?
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func (w *Window) OnKeyUp(key ebiten.Key, f func()) {
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w.KeyUpHandlers[key] = f
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}
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func (w *Window) OnMouseWheel(f func(x, y float64)) {
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w.MouseWheelHandler = f
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}
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func (w *Window) run(screen *ebiten.Image) error {
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if err := w.updateFn(); err != nil {
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return err
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}
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// Process keys
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// TODO: efficient set operations
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for key, cb := range w.KeyUpHandlers {
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if inpututil.IsKeyJustReleased(key) {
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cb()
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}
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}
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if w.MouseWheelHandler != nil {
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x, y := ebiten.Wheel()
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if x != 0 || y != 0 {
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w.MouseWheelHandler(x, y)
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}
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}
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if !ebiten.IsDrawingSkipped() {
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if err := w.drawFn(screen); err != nil {
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return err
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}
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}
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return nil
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}
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// TODO: a stop or other cancellation mechanism
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//
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// Note that this must be called on the main OS thread
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func (w *Window) Run(updateFn func() error, drawFn func(*ebiten.Image) error) error {
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w.updateFn = updateFn
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w.drawFn = drawFn
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return ebiten.Run(w.run, *winX, *winY, 1, w.Title)
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}
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