app: rename EndDraw to EndPaint.

Change-Id: I3e38df0e21be2246dd16886fa00c9360d42db145
Reviewed-on: https://go-review.googlesource.com/12282
Reviewed-by: David Crawshaw <crawshaw@golang.org>

app/app.go

@@ -39,8 +39,8 @@ type App interface {
 	// Send sends an event on the events channel. It does not block.
 	Send(event interface{})
 
-	// EndDraw flushes any pending OpenGL commands or buffers to the screen.
-	EndDraw()
+	// EndPaint flushes any pending OpenGL commands or buffers to the screen.
+	EndPaint()
 }
 
 var (
@@ -49,7 +49,7 @@ var (
 
 	eventsOut = make(chan interface{})
 	eventsIn  = pump(eventsOut)
-	endDraw   = make(chan struct{}, 1)
+	endPaint  = make(chan struct{}, 1)
 )
 
 func sendLifecycle(to lifecycle.Stage) {
@@ -73,18 +73,18 @@ func (app) Send(event interface{}) {
 	eventsIn <- event
 }
 
-func (app) EndDraw() {
+func (app) EndPaint() {
 	// gl.Flush is a lightweight (on modern GL drivers) blocking call
 	// that ensures all GL functions pending in the gl package have
 	// been passed onto the GL driver before the app package attempts
 	// to swap the screen buffer.
 	//
-	// This enforces that the final receive (for this draw cycle) on
-	// gl.WorkAvailable happens before the send on endDraw.
+	// This enforces that the final receive (for this paint cycle) on
+	// gl.WorkAvailable happens before the send on endPaint.
 	gl.Flush()
 
 	select {
-	case endDraw <- struct{}{}:
+	case endPaint <- struct{}{}:
 	default:
 	}
 }
@@ -184,7 +184,7 @@ func Run(cb Callbacks) {
 				if cb.Draw != nil {
 					cb.Draw(c)
 				}
-				a.EndDraw()
+				a.EndPaint()
 			case touch.Event:
 				if cb.Touch != nil {
 					cb.Touch(e, c)

app/darwin_amd64.go

@@ -84,7 +84,7 @@ func loop(ctx C.GLintptr) {
 			select {
 			case <-gl.WorkAvailable:
 				gl.DoWork()
-			case <-endDraw:
+			case <-endPaint:
 				C.CGLFlushDrawable(C.CGLGetCurrentContext())
 				break loop1
 			}

app/darwin_armx.go

@@ -171,7 +171,7 @@ func drawgl(ctx uintptr) {
 		select {
 		case <-gl.WorkAvailable:
 			gl.DoWork()
-		case <-endDraw:
+		case <-endPaint:
 			return
 		}
 	}

app/doc.go

@@ -55,7 +55,7 @@ function exits, the app exits.
 					// ...
 				case paint.Event:
 					log.Print("Call OpenGL here.")
-					a.EndDraw()
+					a.EndPaint()
 				}
 			}
 		})

app/loop_android.go

@@ -129,7 +129,7 @@ func windowDraw(w *C.ANativeWindow, queue *C.AInputQueue, donec chan struct{}) (
 			return false
 		case <-gl.WorkAvailable:
 			gl.DoWork()
-		case <-endDraw:
+		case <-endPaint:
 			// eglSwapBuffers blocks until vsync.
 			C.eglSwapBuffers(C.display, C.surface)
 			eventsIn <- paint.Event{}

app/x11.go

@@ -63,7 +63,7 @@ func main(f func(App)) {
 			return
 		case <-gl.WorkAvailable:
 			gl.DoWork()
-		case <-endDraw:
+		case <-endPaint:
 			C.swapBuffers()
 			tc = ticker.C
 		case <-tc:

event/paint/paint.go

@@ -7,11 +7,6 @@
 // See the golang.org/x/mobile/event package for details on the event model.
 package paint // import "golang.org/x/mobile/event/paint"
 
-// TODO: rename App.EndDraw to App.EndPaint.
-//
-// This is "package paint", not "package draw", to avoid conflicting with the
-// standard library's "image/draw" package.
-
 // Event indicates that the app is ready to paint the next frame of the GUI. A
-// frame is completed by calling the App's EndDraw method.
+// frame is completed by calling the App's EndPaint method.
 type Event struct{}

example/basic/main.go

@@ -70,8 +70,8 @@ func main() {
 				c = e
 				touchLoc = geom.Point{c.Width / 2, c.Height / 2}
 			case paint.Event:
-				onDraw(c)
-				a.EndDraw()
+				onPaint(c)
+				a.EndPaint()
 			case touch.Event:
 				touchLoc = e.Loc
 			}
@@ -104,7 +104,7 @@ func onStop() {
 	gl.DeleteBuffer(buf)
 }
 
-func onDraw(c config.Event) {
+func onPaint(c config.Event) {
 	gl.ClearColor(1, 0, 0, 1)
 	gl.Clear(gl.COLOR_BUFFER_BIT)