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mojo/services/window_manager/view_event_dispatcher.h

+// Copyright 2014 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.
+
+#ifndef SERVICES_WINDOW_MANAGER_VIEW_EVENT_DISPATCHER_H_
+#define SERVICES_WINDOW_MANAGER_VIEW_EVENT_DISPATCHER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/events/event_processor.h"
+#include "ui/events/event_target.h"
+
+namespace window_manager {
+
+class ViewTarget;
+
+class ViewEventDispatcher : public ui::EventProcessor {
+ public:
+  ViewEventDispatcher();
+  ~ViewEventDispatcher() override;
+
+  void SetRootViewTarget(ViewTarget* root_view_target);
+
+ private:
+  // Overridden from ui::EventProcessor:
+  ui::EventTarget* GetRootTarget() override;
+  void OnEventProcessingStarted(ui::Event* event) override;
+
+  // Overridden from ui::EventDispatcherDelegate.
+  bool CanDispatchToTarget(ui::EventTarget* target) override;
+  ui::EventDispatchDetails PreDispatchEvent(ui::EventTarget* target,
+                                            ui::Event* event) override;
+  ui::EventDispatchDetails PostDispatchEvent(
+      ui::EventTarget* target, const ui::Event& event) override;
+
+  // We keep a weak reference to ViewTarget*, which corresponds to the root of
+  // the mojo::View tree.
+  ViewTarget* root_view_target_;
+
+  ViewTarget* event_dispatch_target_;
+  ViewTarget* old_dispatch_target_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewEventDispatcher);
+};
+
+}  // namespace window_manager
+
+#endif  // SERVICES_WINDOW_MANAGER_VIEW_EVENT_DISPATCHER_H_