Bug 894485 - Have touch events precede mouse events to simulate touch devices. r=surkov

accessible/src/base/nsCoreUtils.cpp

@@ -32,6 +32,7 @@
 #include "nsView.h"
 #include "nsLayoutUtils.h"
 #include "nsGkAtoms.h"
+#include "nsDOMTouchEvent.h"
 
 #include "nsComponentManagerUtils.h"
 #include "nsIInterfaceRequestorUtils.h"
@@ -113,6 +114,7 @@ nsCoreUtils::DispatchClickEvent(nsITreeBoxObject *aTreeBoxObj,
   int32_t cnvdY = presContext->CSSPixelsToDevPixels(tcY + y + 1) +
     presContext->AppUnitsToDevPixels(offset.y);
 
+  // XUL is just desktop, so there is no real reason for senfing touch events.
   DispatchMouseEvent(NS_MOUSE_BUTTON_DOWN, cnvdX, cnvdY,
                      tcContent, tcFrame, presShell, rootWidget);
 
@@ -120,33 +122,6 @@ nsCoreUtils::DispatchClickEvent(nsITreeBoxObject *aTreeBoxObj,
                      tcContent, tcFrame, presShell, rootWidget);
 }
 
-bool
-nsCoreUtils::DispatchMouseEvent(uint32_t aEventType,
-                                nsIPresShell *aPresShell,
-                                nsIContent *aContent)
-{
-  nsIFrame *frame = aContent->GetPrimaryFrame();
-  if (!frame)
-    return false;
-
-  // Compute x and y coordinates.
-  nsPoint point;
-  nsCOMPtr<nsIWidget> widget = frame->GetNearestWidget(point);
-  if (!widget)
-    return false;
-
-  nsSize size = frame->GetSize();
-
-  nsPresContext* presContext = aPresShell->GetPresContext();
-
-  int32_t x = presContext->AppUnitsToDevPixels(point.x + size.width / 2);
-  int32_t y = presContext->AppUnitsToDevPixels(point.y + size.height / 2);
-
-  // Fire mouse event.
-  DispatchMouseEvent(aEventType, x, y, aContent, frame, aPresShell, widget);
-  return true;
-}
-
 void
 nsCoreUtils::DispatchMouseEvent(uint32_t aEventType, int32_t aX, int32_t aY,
                                 nsIContent *aContent, nsIFrame *aFrame,
@@ -166,6 +141,28 @@ nsCoreUtils::DispatchMouseEvent(uint32_t aEventType, int32_t aX, int32_t aY,
   aPresShell->HandleEventWithTarget(&event, aFrame, aContent, &status);
 }
 
+void
+nsCoreUtils::DispatchTouchEvent(uint32_t aEventType, int32_t aX, int32_t aY,
+                                nsIContent* aContent, nsIFrame* aFrame,
+                                nsIPresShell* aPresShell, nsIWidget* aRootWidget)
+{
+  if (!nsDOMTouchEvent::PrefEnabled())
+    return;
+
+  nsTouchEvent event(true, aEventType, aRootWidget);
+
+  event.time = PR_IntervalNow();
+
+  // XXX: Touch has an identifier of -1 to hint that it is synthesized.
+  nsRefPtr<mozilla::dom::Touch> t =
+    new mozilla::dom::Touch(-1, nsIntPoint(aX, aY),
+                            nsIntPoint(1, 1), 0.0f, 1.0f);
+  t->SetTarget(aContent);
+  event.touches.AppendElement(t);
+  nsEventStatus status = nsEventStatus_eIgnore;
+  aPresShell->HandleEventWithTarget(&event, aFrame, aContent, &status);
+}
+
 uint32_t
 nsCoreUtils::GetAccessKeyFor(nsIContent* aContent)
 {

accessible/src/base/nsCoreUtils.h

@@ -46,17 +46,6 @@ public:
                                  int32_t aRowIndex, nsITreeColumn *aColumn,
                                  const nsCString& aPseudoElt = EmptyCString());
 
-  /**
-   * Send mouse event to the given element.
-   *
-   * @param  aEventType  [in] an event type (see nsGUIEvent.h for constants)
-   * @param  aPresShell  [in] the presshell for the given element
-   * @param  aContent    [in] the element
-   */
-  static bool DispatchMouseEvent(uint32_t aEventType,
-                                   nsIPresShell *aPresShell,
-                                   nsIContent *aContent);
-
   /**
    * Send mouse event to the given element.
    *
@@ -70,8 +59,22 @@ public:
    */
   static void DispatchMouseEvent(uint32_t aEventType, int32_t aX, int32_t aY,
                                  nsIContent *aContent, nsIFrame *aFrame,
-                                 nsIPresShell *aPresShell,
-                                 nsIWidget *aRootWidget);
+                                 nsIPresShell *aPresShell, nsIWidget *aRootWidget);
+
+  /**
+   * Send a touch event with a single touch point to the given element.
+   *
+   * @param aEventType   [in] an event type (see nsGUIEvent.h for constants)
+   * @param aX           [in] x coordinate in dev pixels
+   * @param aY           [in] y coordinate in dev pixels
+   * @param aContent     [in] the element
+   * @param aFrame       [in] frame of the element
+   * @param aPresShell   [in] the presshell for the element
+   * @param aRootWidget  [in] the root widget of the element
+   */
+  static void DispatchTouchEvent(uint32_t aEventType, int32_t aX, int32_t aY,
+                                 nsIContent* aContent, nsIFrame* aFrame,
+                                 nsIPresShell* aPresShell, nsIWidget* aRootWidget);
 
   /**
    * Return an accesskey registered on the given element by

accessible/src/generic/Accessible.cpp

@@ -2293,13 +2293,28 @@ Accessible::DispatchClickEvent(nsIContent *aContent, uint32_t aActionIndex)
                                    nsIPresShell::ScrollAxis(),
                                    nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
 
-  // Fire mouse down and mouse up events.
-  bool res = nsCoreUtils::DispatchMouseEvent(NS_MOUSE_BUTTON_DOWN, presShell,
-                                               aContent);
-  if (!res)
+  nsIFrame* frame = aContent->GetPrimaryFrame();
+  if (!frame)
     return;
 
-  nsCoreUtils::DispatchMouseEvent(NS_MOUSE_BUTTON_UP, presShell, aContent);
+  // Compute x and y coordinates.
+  nsPoint point;
+  nsCOMPtr<nsIWidget> widget = frame->GetNearestWidget(point);
+  if (!widget)
+    return;
+
+  nsSize size = frame->GetSize();
+
+  nsPresContext* presContext = presShell->GetPresContext();
+
+  int32_t x = presContext->AppUnitsToDevPixels(point.x + size.width / 2);
+  int32_t y = presContext->AppUnitsToDevPixels(point.y + size.height / 2);
+
+  // Simulate a touch interaction by dispatching touch events with mouse events.
+  nsCoreUtils::DispatchTouchEvent(NS_TOUCH_START, x, y, aContent, frame, presShell, widget);
+  nsCoreUtils::DispatchMouseEvent(NS_MOUSE_BUTTON_DOWN, x, y, aContent, frame, presShell, widget);
+  nsCoreUtils::DispatchTouchEvent(NS_TOUCH_END, x, y, aContent, frame, presShell, widget);
+  nsCoreUtils::DispatchMouseEvent(NS_MOUSE_BUTTON_UP, x, y, aContent, frame, presShell, widget);
 }
 
 NS_IMETHODIMP