zntg/ui/ui.go

package ui

import (
	"time"

	"opslag.de/schobers/geom"
)

// Run runs the application loop.
func Run(r Renderer, s *Style, view Control) error {
	return RunWait(r, s, view, false)
}

// RunWait runs the application loop and conditionally waits on events before rendering.
func RunWait(r Renderer, s *Style, view Control, wait bool) error {
	ctx := &context{quit: make(chan struct{}), r: r, style: s, view: view, ims: NewImages(r)}
	root, ok := view.(RootControl)
	if ok {
		err := root.Init(ctx)
		if err != nil {
			return err
		}
	}
	anim := time.NewTicker(30 * time.Millisecond)
	go func() {
		for {
			select {
			case <-anim.C:
			case <-ctx.quit:
				return
			}
			if ctx.animate {
				r.Refresh()
			}
			ctx.animate = false
		}
	}()
	defer anim.Stop()

	ctx.Renderer().Refresh()
	for !ctx.HasQuit() {
		var size = r.Size()
		var bounds = geom.RectF32(0, 0, size.X, size.Y)
		view.Arrange(ctx, bounds, geom.ZeroPtF32, nil)
		view.Render(ctx)
		if ctx.HasQuit() {
			return nil
		}
		r.PushEvents(ctx, wait)
	}
	return nil
}