mus: Add watcher for all touch events.

ui/views/mus/window_manager_connection.cc

Index: ui/views/mus/window_manager_connection.cc
diff --git a/ui/views/mus/window_manager_connection.cc b/ui/views/mus/window_manager_connection.cc
index 3936c25b2b88f41ee837aab2f68ccb27e4de57dd..ead1131b18a38402818dab98d28ddb14f8d64b6f 100644
--- a/ui/views/mus/window_manager_connection.cc
+++ b/ui/views/mus/window_manager_connection.cc
@@ -21,6 +21,7 @@
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/screen_mus.h"
 #include "ui/views/pointer_watcher.h"
+#include "ui/views/touch_event_watcher.h"
 #include "ui/views/views_delegate.h"
 
 namespace views {
@@ -81,6 +82,8 @@ NativeWidget* WindowManagerConnection::CreateNativeWidgetMus(
 }
 
 void WindowManagerConnection::AddPointerWatcher(PointerWatcher* watcher) {
+  // TODO(riajiang): Support multiple event matchers (issue 627146).

[sadrul, 2016/07/11 20:47:52]

s#issue 627146#crbug.com/627146#

[riajiang, 2016/07/11 21:51:40]

Done.

+  DCHECK(!HasTouchEventWatcher());
   bool had_watcher = HasPointerWatcher();
   pointer_watchers_.AddObserver(watcher);
   if (!had_watcher) {
@@ -101,6 +104,28 @@ void WindowManagerConnection::RemovePointerWatcher(PointerWatcher* watcher) {
   }
 }
 
+void WindowManagerConnection::AddTouchEventWatcher(TouchEventWatcher* watcher) {
+  // TODO(riajiang): Support multiple event matchers (issue 627146).
+  DCHECK(!HasPointerWatcher());
+  bool had_watcher = HasTouchEventWatcher();
+  touch_event_watchers_.AddObserver(watcher);
+  if (!had_watcher) {
+    ui::mojom::EventMatcherPtr matcher = ui::mojom::EventMatcher::New();
+    matcher->pointer_kind_matcher = ui::mojom::PointerKindMatcher::New();
+    matcher->pointer_kind_matcher->pointer_kind = ui::mojom::PointerKind::TOUCH;
+    client_->SetEventObserver(std::move(matcher));
+  }
+}
+
+void WindowManagerConnection::RemoveTouchEventWatcher(
+    TouchEventWatcher* watcher) {
+  touch_event_watchers_.RemoveObserver(watcher);
+  if (!HasTouchEventWatcher()) {
+    // Last PointerWatcher removed, stop the event observer.
+    client_->SetEventObserver(nullptr);
+  }
+}
+
 const std::set<ui::Window*>& WindowManagerConnection::GetRoots() const {
   return client_->GetRoots();
 }
@@ -151,6 +176,15 @@ bool WindowManagerConnection::HasPointerWatcher() {
   return !!iterator.GetNext();
 }
 
+bool WindowManagerConnection::HasTouchEventWatcher() {
+  // Check to see if we really have any observers left. This doesn't use
+  // base::ObserverList<>::might_have_observers() because that returns true
+  // during iteration over the list even when the last observer is removed.
+  base::ObserverList<TouchEventWatcher>::Iterator iterator(
+      &touch_event_watchers_);
+  return !!iterator.GetNext();
+}
+
 void WindowManagerConnection::OnEmbed(ui::Window* root) {}
 
 void WindowManagerConnection::OnDidDestroyClient(ui::WindowTreeClient* client) {
@@ -184,6 +218,13 @@ void WindowManagerConnection::OnEventObserved(const ui::Event& event,
                       OnTouchPressed(*event.AsTouchEvent(), location_in_screen,
                                      target_widget));
   }
+
+  // Receives TouchEvent and TouchPointerEvent
+  if (event.IsTouchEvent() || event.IsTouchPointerEvent()) {
+    FOR_EACH_OBSERVER(TouchEventWatcher, touch_event_watchers_,
+                      OnTouchEventObserved(*event.AsLocatedEvent(),
+                                           location_in_screen, target_widget));
+  }

[sadrul, 2016/07/11 20:47:52]

Change to:

  if (HasPointerWatcher()) {
   ... trigger PointerWatchers
  } else {
    DCHECK(HasTouchEventWatcher());
    ... trigger TouchEventWatchers
  }

[riajiang, 2016/07/11 21:51:40]

Done.

 }
 
 void WindowManagerConnection::OnWindowManagerFrameValuesChanged() {