Bug 787549 - B2G: Stop simulating mouse events unless there's a tap. r=cjones

dom/ipc/PBrowser.ipdl

@@ -292,6 +292,13 @@ child:
      */
     HandleDoubleTap(nsIntPoint point);
 
+    /**
+     * Requests handling of a single tap. |point| is in CSS pixels, relative to
+     * the scroll offset. This message is expected to send a "mousedown" and
+     * "mouseup" series of events at this point.
+     */
+    HandleSingleTap(nsIntPoint point);
+
     /**
      * Sending an activate message moves focus to the child.
      */

dom/ipc/TabChild.cpp

@@ -888,6 +888,19 @@ TabChild::RecvHandleDoubleTap(const nsIntPoint& aPoint)
     return true;
 }
 
+bool
+TabChild::RecvHandleSingleTap(const nsIntPoint& aPoint)
+{
+  if (!mCx || !mTabChildGlobal) {
+    return true;
+  }
+
+  RecvMouseEvent(NS_LITERAL_STRING("mousedown"), aPoint.x, aPoint.y, 0, 1, 0, false);
+  RecvMouseEvent(NS_LITERAL_STRING("mouseup"), aPoint.x, aPoint.y, 0, 1, 0, false);
+
+  return true;
+}
+
 bool
 TabChild::RecvActivate()
 {
@@ -936,61 +949,67 @@ TabChild::RecvMouseWheelEvent(const WheelEvent& event)
   return true;
 }
 
+void
+TabChild::DispatchSynthesizedMouseEvent(const nsTouchEvent& aEvent)
+{
+  // Synthesize a phony mouse event.
+  uint32_t msg;
+  switch (aEvent.message) {
+    case NS_TOUCH_START:
+      msg = NS_MOUSE_BUTTON_DOWN;
+      break;
+    case NS_TOUCH_MOVE:
+      msg = NS_MOUSE_MOVE;
+      break;
+    case NS_TOUCH_END:
+    case NS_TOUCH_CANCEL:
+      msg = NS_MOUSE_BUTTON_UP;
+      break;
+    default:
+      MOZ_NOT_REACHED("Unknown touch event message");
+  }
+
+  nsIntPoint refPoint(0, 0);
+  if (aEvent.touches.Length()) {
+    refPoint = aEvent.touches[0]->mRefPoint;
+  }
+
+  nsMouseEvent event(true, msg, NULL,
+      nsMouseEvent::eReal, nsMouseEvent::eNormal);
+  event.refPoint = refPoint;
+  event.time = aEvent.time;
+  event.button = nsMouseEvent::eLeftButton;
+  if (msg != NS_MOUSE_MOVE) {
+    event.clickCount = 1;
+  }
+
+  DispatchWidgetEvent(event);
+}
+
 bool
 TabChild::RecvRealTouchEvent(const nsTouchEvent& aEvent)
 {
-    nsTouchEvent localEvent(aEvent);
-    nsEventStatus status = DispatchWidgetEvent(localEvent);
+  nsTouchEvent localEvent(aEvent);
+  nsEventStatus status = DispatchWidgetEvent(localEvent);
 
+  if (IsAsyncPanZoomEnabled()) {
     nsCOMPtr<nsPIDOMWindow> outerWindow = do_GetInterface(mWebNav);
     nsCOMPtr<nsPIDOMWindow> innerWindow = outerWindow->GetCurrentInnerWindow();
+
     if (innerWindow && innerWindow->HasTouchEventListeners()) {
       SendContentReceivedTouch(nsIPresShell::gPreventMouseEvents);
     }
+  } else if (status != nsEventStatus_eConsumeNoDefault) {
+    DispatchSynthesizedMouseEvent(aEvent);
+  }
 
-    if (status == nsEventStatus_eConsumeNoDefault) {
-        return true;
-    }
-
-    // Synthesize a phony mouse event.
-    uint32_t msg;
-    switch (aEvent.message) {
-    case NS_TOUCH_START:
-        msg = NS_MOUSE_BUTTON_DOWN;
-        break;
-    case NS_TOUCH_MOVE:
-        msg = NS_MOUSE_MOVE;
-        break;
-    case NS_TOUCH_END:
-    case NS_TOUCH_CANCEL:
-        msg = NS_MOUSE_BUTTON_UP;
-        break;
-    default:
-        MOZ_NOT_REACHED("Unknown touch event message");
-    }
-
-    nsIntPoint refPoint(0, 0);
-    if (aEvent.touches.Length()) {
-        refPoint = aEvent.touches[0]->mRefPoint;
-    }
-
-    nsMouseEvent event(true, msg, NULL,
-                       nsMouseEvent::eReal, nsMouseEvent::eNormal);
-    event.refPoint = refPoint;
-    event.time = aEvent.time;
-    event.button = nsMouseEvent::eLeftButton;
-    if (msg != NS_MOUSE_MOVE) {
-        event.clickCount = 1;
-    }
-
-    DispatchWidgetEvent(event);
-    return true;
+  return true;
 }
 
 bool
 TabChild::RecvRealTouchMoveEvent(const nsTouchEvent& aEvent)
 {
-    return RecvRealTouchEvent(aEvent);
+  return RecvRealTouchEvent(aEvent);
 }
 
 bool

dom/ipc/TabChild.h

@@ -183,6 +183,7 @@ public:
     virtual bool RecvUpdateDimensions(const nsRect& rect, const nsIntSize& size);
     virtual bool RecvUpdateFrame(const mozilla::layers::FrameMetrics& aFrameMetrics);
     virtual bool RecvHandleDoubleTap(const nsIntPoint& aPoint);
+    virtual bool RecvHandleSingleTap(const nsIntPoint& aPoint);
     virtual bool RecvActivate();
     virtual bool RecvDeactivate();
     virtual bool RecvMouseEvent(const nsString& aType,
@@ -323,6 +324,9 @@ private:
     void DispatchMessageManagerMessage(const nsAString& aMessageName,
                                        const nsACString& aJSONData);
 
+    // Sends a simulated mouse event from a touch event for compatibility.
+    void DispatchSynthesizedMouseEvent(const nsTouchEvent& aEvent);
+
     nsresult
     BrowserFrameProvideWindow(nsIDOMWindow* aOpener,
                               nsIURI* aURI,

dom/ipc/TabParent.cpp

@@ -252,6 +252,11 @@ void TabParent::HandleDoubleTap(const nsIntPoint& aPoint)
   unused << SendHandleDoubleTap(aPoint);
 }
 
+void TabParent::HandleSingleTap(const nsIntPoint& aPoint)
+{
+  unused << SendHandleSingleTap(aPoint);
+}
+
 void
 TabParent::Activate()
 {

dom/ipc/TabParent.h

@@ -152,6 +152,7 @@ public:
     void UpdateDimensions(const nsRect& rect, const nsIntSize& size);
     void UpdateFrame(const layers::FrameMetrics& aFrameMetrics);
     void HandleDoubleTap(const nsIntPoint& aPoint);
+    void HandleSingleTap(const nsIntPoint& aPoint);
     void Activate();
     void Deactivate();
 

gfx/layers/ipc/AsyncPanZoomController.cpp

@@ -524,7 +524,15 @@ nsEventStatus AsyncPanZoomController::OnLongPress(const TapGestureInput& aEvent)
 }
 
 nsEventStatus AsyncPanZoomController::OnSingleTapUp(const TapGestureInput& aEvent) {
-  // XXX: Implement this.
+  if (mGeckoContentController) {
+    MonitorAutoLock monitor(mMonitor);
+
+    gfx::Point point = WidgetSpaceToCompensatedViewportSpace(
+      gfx::Point(aEvent.mPoint.x, aEvent.mPoint.y),
+      mFrameMetrics.mResolution.width);
+    mGeckoContentController->HandleSingleTap(nsIntPoint(NS_lround(point.x), NS_lround(point.y)));
+    return nsEventStatus_eConsumeNoDefault;
+  }
   return nsEventStatus_eIgnore;
 }
 
@@ -989,6 +997,8 @@ void AsyncPanZoomController::NotifyLayersUpdated(const FrameMetrics& aViewportFr
     // we get a larger displayport. This is very bad because we're wasting a
     // paint and not initializating the displayport correctly.
     RequestContentRepaint();
+
+    mState = NOTHING;
   } else if (!mFrameMetrics.mCSSContentRect.IsEqualEdges(aViewportFrame.mCSSContentRect)) {
     mFrameMetrics.mCSSContentRect = aViewportFrame.mCSSContentRect;
     SetPageRect(mFrameMetrics.mCSSContentRect);

gfx/layers/ipc/GeckoContentController.h

@@ -31,6 +31,13 @@ public:
    */
   virtual void HandleDoubleTap(const nsIntPoint& aPoint) = 0;
 
+  /**
+   * Requests handling a single tap. |aPoint| is in CSS pixels, relative to the
+   * current scroll offset. This should simulate and send to content a mouse
+   * button down, then mouse button up at |aPoint|.
+   */
+  virtual void HandleSingleTap(const nsIntPoint& aPoint) = 0;
+
   GeckoContentController() {}
   virtual ~GeckoContentController() {}
 };

layout/ipc/RenderFrameParent.cpp

@@ -511,6 +511,23 @@ public:
     }
   }
 
+  virtual void HandleSingleTap(const nsIntPoint& aPoint) MOZ_OVERRIDE
+  {
+    if (MessageLoop::current() != mUILoop) {
+      // We have to send this message from the "UI thread" (main
+      // thread).
+      mUILoop->PostTask(
+        FROM_HERE,
+        NewRunnableMethod(this, &RemoteContentController::HandleSingleTap,
+                          aPoint));
+      return;
+    }
+    if (mRenderFrame) {
+      TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
+      browser->HandleSingleTap(aPoint);
+    }
+  }
+
   void ClearRenderFrame() { mRenderFrame = nullptr; }
 
 private: