Bug 503943, add mouse capturing api to elements, remove capturing from views, r=roc,sr=smaug

content/base/src/nsGenericElement.cpp

@@ -1084,6 +1084,29 @@ nsNSElementTearoff::GetClassList(nsIDOMDOMTokenList** aResult)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsNSElementTearoff::SetCapture(PRBool aRetargetToElement)
+{
+  // If there is already an active capture, ignore this request. This would
+  // occur if a splitter, frame resizer, etc had already captured and we don't
+  // want to override those.
+  nsCOMPtr<nsIDOMNode> node = do_QueryInterface(nsIPresShell::GetCapturingContent());
+  if (node)
+    return NS_OK;
+
+  nsIPresShell::SetCapturingContent(mContent, aRetargetToElement ? CAPTURE_RETARGETTOELEMENT : 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSElementTearoff::ReleaseCapture()
+{
+  if (nsIPresShell::GetCapturingContent() == mContent) {
+    nsIPresShell::SetCapturingContent(nsnull, 0);
+  }
+  return NS_OK;
+}
+
 //----------------------------------------------------------------------