Bug 1098161 - Notify shortcut mode to system app when long tap on content with empty text. r=roc

layout/base/SelectionCarets.cpp

@@ -547,6 +547,7 @@ SelectionCarets::SelectWord()
   bool selectable;
   ptFrame->IsSelectable(&selectable, nullptr);
   if (!selectable) {
+    SELECTIONCARETS_LOG("Unable to select");
     return NS_OK;
   }
 
@@ -557,14 +558,18 @@ SelectionCarets::SelectWord()
   // target frame isn't editable and our focus content is editable, we should
   // clear focus.
   nsFocusManager* fm = nsFocusManager::GetFocusManager();
+
   nsIContent* editingHost = ptFrame->GetContent()->GetEditingHost();
   if (editingHost) {
+    SELECTIONCARETS_LOG("Select editable content %p", editingHost);
     nsCOMPtr<nsIDOMElement> elt = do_QueryInterface(editingHost->GetParent());
     if (elt) {
       fm->SetFocus(elt, 0);
     }
   } else {
     nsIContent* focusedContent = GetFocusedContent();
+    SELECTIONCARETS_LOG("Select non-editable content %p", focusedContent);
+
     if (focusedContent && focusedContent->GetTextEditorRootContent()) {
       nsIDOMWindow* win = mPresShell->GetDocument()->GetWindow();
       if (win) {
@@ -573,6 +578,18 @@ SelectionCarets::SelectWord()
     }
   }
 
+  nsIContent* selectedContent = ptFrame->GetContent();
+  if (selectedContent && !nsContentUtils::HasNonEmptyTextContent(
+        selectedContent, nsContentUtils::eRecurseIntoChildren)) {
+    SELECTIONCARETS_LOG("Select content %p with empty text", selectedContent);
+    // Long tap event on this non-editable content with empty text, no action
+    // for selectioncarets but need to dispatch the touchcarettap event
+    // to support the short cut mode
+    DispatchCustomEvent(NS_LITERAL_STRING("touchcarettap"));
+    return NS_OK;
+  }
+
+
   SetSelectionDragState(true);
   nsFrame* frame = static_cast<nsFrame*>(ptFrame);
   nsresult rs = frame->SelectByTypeAtPoint(mPresShell->GetPresContext(), ptInFrame,
@@ -1008,6 +1025,20 @@ SelectionCarets::GetSelectionBoundingRect(Selection* aSel)
   return res;
 }
 
+void
+SelectionCarets::DispatchCustomEvent(const nsAString& aEvent)
+{
+  bool defaultActionEnabled = true;
+  nsIDocument* doc = mPresShell->GetDocument();
+  MOZ_ASSERT(doc);
+  nsContentUtils::DispatchTrustedEvent(doc,
+                                       ToSupports(doc),
+                                       aEvent,
+                                       true,
+                                       false,
+                                       &defaultActionEnabled);
+}
+
 void
 SelectionCarets::DispatchSelectionStateChangedEvent(Selection* aSelection,
                                                     SelectionState aState)

layout/base/SelectionCarets.h

@@ -207,6 +207,7 @@ private:
                                           dom::SelectionState aState);
   void DispatchSelectionStateChangedEvent(dom::Selection* aSelection,
                                           const dom::Sequence<dom::SelectionState>& aStates);
+  void DispatchCustomEvent(const nsAString& aEvent);
   nsRect GetSelectionBoundingRect(dom::Selection* aSel);
 
   /**