mus: Change PointerWatcher to observe all pointer events, with moves optional.

ui/views/mus/window_manager_connection.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/mus/window_manager_connection.h"
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/ui/common/gpu_service.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/cpp/window.h"
 #include "services/ui/public/cpp/window_property.h"
 #include "services/ui/public/cpp/window_tree_client.h"
 #include "services/ui/public/interfaces/event_matcher.mojom.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 #include "ui/views/mus/clipboard_mus.h"
 #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 {
 namespace {
 
 using WindowManagerConnectionPtr =
     base::ThreadLocalPointer<views::WindowManagerConnection>;
 
 // Env is thread local so that aura may be used on multiple threads.
 base::LazyInstance<WindowManagerConnectionPtr>::Leaky lazy_tls_ptr =
@@ skipping 53 matching lines @@
   if (init_params.type == Widget::InitParams::TYPE_CONTROL)
     return nullptr;
   std::map<std::string, std::vector<uint8_t>> properties = props;
   NativeWidgetMus::ConfigurePropertiesForNewWindow(init_params, &properties);
   properties[ui::mojom::WindowManager::kAppID_Property] =
       mojo::ConvertTo<std::vector<uint8_t>>(identity_.name());
   return new NativeWidgetMus(delegate, NewWindow(properties),
                              ui::mojom::SurfaceType::DEFAULT);
 }
 
-void WindowManagerConnection::AddPointerWatcher(PointerWatcher* watcher) {
-  // TODO(riajiang): Support multiple event matchers (crbug.com/627146).
-  DCHECK(!HasTouchEventWatcher());
+void WindowManagerConnection::AddPointerWatcher(PointerWatcher* watcher,
+                                                bool want_moves) {
+  // Pointer watchers cannot be added multiple times.
+  DCHECK(!pointer_watchers_.HasObserver(watcher));
+  // TODO(jamescook): Support adding pointer watchers with different
+  // |want_moves| values by tracking whether the set as a whole wants moves.
+  // This will involve sending observed move events to a subset of the
+  // watchers. (crbug.com/627146)
+  DCHECK(!HasPointerWatcher() || want_moves == pointer_watcher_want_moves_);
+  pointer_watcher_want_moves_ = want_moves;
+
   bool had_watcher = HasPointerWatcher();
   pointer_watchers_.AddObserver(watcher);
   if (!had_watcher) {
-    // Start a watcher for pointer down.
-    // TODO(jamescook): Extend event observers to handle multiple event types.
-    ui::mojom::EventMatcherPtr matcher = ui::mojom::EventMatcher::New();
-    matcher->type_matcher = ui::mojom::EventTypeMatcher::New();
-    matcher->type_matcher->type = ui::mojom::EventType::POINTER_DOWN;
-    client_->SetEventObserver(std::move(matcher));
+    // First PointerWatcher added, start the watcher on the window server.
+    client_->StartPointerWatcher(want_moves);
   }
 }
 
 void WindowManagerConnection::RemovePointerWatcher(PointerWatcher* watcher) {
   pointer_watchers_.RemoveObserver(watcher);
   if (!HasPointerWatcher()) {
-    // Last PointerWatcher removed, stop the event observer.
-    client_->SetEventObserver(nullptr);
+    // Last PointerWatcher removed, stop the watcher on the window server.
+    client_->StopPointerWatcher();
+    pointer_watcher_want_moves_ = false;
   }
 }
 
-void WindowManagerConnection::AddTouchEventWatcher(TouchEventWatcher* watcher) {
-  // TODO(riajiang): Support multiple event matchers (crbug.com/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 TouchEventWatcher removed, stop the event observer.
-    client_->SetEventObserver(nullptr);
-  }
-}
-
 const std::set<ui::Window*>& WindowManagerConnection::GetRoots() const {
   return client_->GetRoots();
 }
 
 WindowManagerConnection::WindowManagerConnection(
     shell::Connector* connector,
     const shell::Identity& identity)
-    : connector_(connector), identity_(identity) {
+    : connector_(connector),
+      identity_(identity),
+      pointer_watcher_want_moves_(false) {
   lazy_tls_ptr.Pointer()->Set(this);
 
   gpu_service_ = ui::GpuService::Initialize(connector);
   client_.reset(new ui::WindowTreeClient(this, nullptr, nullptr));
   client_->ConnectViaWindowTreeFactory(connector_);
 
   screen_.reset(new ScreenMus(this));
   screen_->Init(connector);
 
   std::unique_ptr<ClipboardMus> clipboard(new ClipboardMus);
   clipboard->Init(connector);
   ui::Clipboard::SetClipboardForCurrentThread(std::move(clipboard));
 
   ViewsDelegate::GetInstance()->set_native_widget_factory(base::Bind(
       &WindowManagerConnection::CreateNativeWidgetMus,
       base::Unretained(this),
       std::map<std::string, std::vector<uint8_t>>()));
 }
 
 bool WindowManagerConnection::HasPointerWatcher() {
   // 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<PointerWatcher>::Iterator iterator(&pointer_watchers_);
   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) {
   if (client_.get() == client) {
     client_.release();
   } else {
     DCHECK(!client_);
   }
 }
 
-void WindowManagerConnection::OnEventObserved(const ui::Event& event,
-                                              ui::Window* target) {
-  if (!event.IsLocatedEvent())
-    return;
+void WindowManagerConnection::OnPointerEventObserved(
+    const ui::PointerEvent& event,
+    ui::Window* target) {
+  DCHECK(event.IsLocatedEvent());
   Widget* target_widget = nullptr;
   if (target) {
     ui::Window* root = target->GetRoot();
     target_widget = NativeWidgetMus::GetWidgetForWindow(root);
   }
 
   // The mojo input events type converter uses the event root_location field
   // to store screen coordinates. Screen coordinates really should be returned
   // separately. See http://crbug.com/608547
   gfx::Point location_in_screen = event.AsLocatedEvent()->root_location();
-  if (HasPointerWatcher()) {
-    if (event.type() == ui::ET_MOUSE_PRESSED) {
-      FOR_EACH_OBSERVER(PointerWatcher, pointer_watchers_,
-                        OnMousePressed(*event.AsMouseEvent(),
-                                       location_in_screen, target_widget));
-    } else if (event.type() == ui::ET_TOUCH_PRESSED) {
-      FOR_EACH_OBSERVER(PointerWatcher, pointer_watchers_,
-                        OnTouchPressed(*event.AsTouchEvent(),
-                                       location_in_screen, target_widget));
-    }
-  } else if (HasTouchEventWatcher()) {
-    if (event.IsTouchEvent() || event.IsTouchPointerEvent()) {
-      FOR_EACH_OBSERVER(
-          TouchEventWatcher, touch_event_watchers_,
-          OnTouchEventObserved(*event.AsLocatedEvent(), target_widget));
-    }
-  }
+  FOR_EACH_OBSERVER(
+      PointerWatcher, pointer_watchers_,
+      OnPointerEventObserved(event, location_in_screen, target_widget));
 }
 
 void WindowManagerConnection::OnWindowManagerFrameValuesChanged() {
   if (client_)
     NativeWidgetMus::NotifyFrameChanged(client_.get());
 }
 
 gfx::Point WindowManagerConnection::GetCursorScreenPoint() {
   return client_->GetCursorScreenPoint();
 }
 
 }  // namespace views