internal/uidriver/mobile/ui.go
func (u *UserInterface) appMain(a app.App) {
	var glctx gl.Context
	touches := map[touch.Sequence]*Touch{}
	for e := range a.Events() {
		switch e := a.Filter(e).(type) {
		case lifecycle.Event:
			switch e.Crosses(lifecycle.StageVisible) {
			case lifecycle.CrossOn:
				glctx, _ = e.DrawContext.(gl.Context)
				// Assume that glctx is always a same instance.
				// Then, only once initializing should be enough.
				if glContextCh != nil {
					glContextCh <- glctx
					glContextCh = nil
				}
				a.Send(paint.Event{})
			case lifecycle.CrossOff:
				glctx = nil
			}
		case size.Event:
			u.setFullscreenImpl(e.WidthPx, e.HeightPx)
		case paint.Event:
			if glctx == nil || e.External {
				continue
			}
			renderCh <- struct{}{}
			<-renderChEnd
			a.Publish()
			a.Send(paint.Event{})
		case touch.Event:
			switch e.Type {
			case touch.TypeBegin, touch.TypeMove:
				s := getDeviceScale()
				x, y := float64(e.X)/s, float64(e.Y)/s
				// TODO: Is it ok to cast from int64 to int here?
				touches[e.Sequence] = &Touch{
					ID: int(e.Sequence),
					X:  int(x),
					Y:  int(y),
				}
			case touch.TypeEnd:
				delete(touches, e.Sequence)
			}
			ts := []*Touch{}
			for _, t := range touches {
				ts = append(ts, t)
			}
			u.input.update(ts)
		}
	}
}
func (u *UserInterface) appMain(a app.App) {
	var glctx gl.Context
	touches := map[touch.Sequence]*Touch{}
	for e := range a.Events() {
		switch e := a.Filter(e).(type) {
		case lifecycle.Event:
			switch e.Crosses(lifecycle.StageVisible) {
			case lifecycle.CrossOn:
				glctx, _ = e.DrawContext.(gl.Context)
				// Assume that glctx is always a same instance.
				// Then, only once initializing should be enough.
				if glContextCh != nil {
					glContextCh <- glctx
					glContextCh = nil
				}
				a.Send(paint.Event{})
			case lifecycle.CrossOff:
				glctx = nil
			}
		case size.Event:
			u.setFullscreenImpl(e.WidthPx, e.HeightPx)
		case paint.Event:
			if glctx == nil || e.External {
				continue
			}
			renderCh <- struct{}{}
			<-renderChEnd
			a.Publish()
			a.Send(paint.Event{})
		case touch.Event:
			switch e.Type {
			case touch.TypeBegin, touch.TypeMove:
				s := getDeviceScale()
				x, y := float64(e.X)/s, float64(e.Y)/s
				// TODO: Is it ok to cast from int64 to int here?
				touches[e.Sequence] = &Touch{
					ID: int(e.Sequence),
					X:  int(x),
					Y:  int(y),
				}
			case touch.TypeEnd:
				delete(touches, e.Sequence)
			}
			ts := []*Touch{}
			for _, t := range touches {
				ts = append(ts, t)
			}
			u.input.update(ts)
		}
	}
}
func ( u * UserInterface ) appMain ( a app . App ) { var glctx gl . Context touches := map [ touch . Sequence ] * Touch { } for e := range a . Events ( ) { switch e := a . Filter ( e ) . ( type ) { case lifecycle . Event : switch e . Crosses ( lifecycle . StageVisible ) { case lifecycle . CrossOn : glctx , _ = e . DrawContext . ( gl . Context ) // Assume that glctx is always a same instance. // Then, only once initializing should be enough. if glContextCh != nil { glContextCh <- glctx glContextCh = nil } a . Send ( paint . Event { } ) case lifecycle . CrossOff : glctx = nil } case size . Event : u . setFullscreenImpl ( e . WidthPx , e . HeightPx ) case paint . Event : if glctx == nil || e . External { continue } renderCh <- struct { } { } <- renderChEnd a . Publish ( ) a . Send ( paint . Event { } ) case touch . Event : switch e . Type { case touch . TypeBegin , touch . TypeMove : s := getDeviceScale ( ) x , y := float64 ( e . X ) / s , float64 ( e . Y ) / s // TODO: Is it ok to cast from int64 to int here? touches [ e . Sequence ] = & Touch { ID : int ( e . Sequence ) , X : int ( x ) , Y : int ( y ) , } case touch . TypeEnd : delete ( touches , e . Sequence ) } ts := [ ] * Touch { } for _ , t := range touches { ts = append ( ts , t ) } u . input . update ( ts ) } } }
// appMain is the main routine for gomobile-build mode.
appMain is the main routine for gomobile - build mode .