V2

ui/views/widget/root_view.h

+// Copyright (c) 2011 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 UI_VIEWS_WIDGET_ROOT_VIEW_H_
+#define UI_VIEWS_WIDGET_ROOT_VIEW_H_
+#pragma once
+
+#include "ui/views/view.h"
+
+namespace ui {
+namespace internal {
+
+////////////////////////////////////////////////////////////////////////////////
+// RootView class
+//
+//  A View subclass that owns a View hierarchy. Used by the Widget to perform
+//  View-specific event tracking.
+//
+class RootView : public View {
+ public:
+  RootView(Widget* widget, View* contents_view);
+  virtual ~RootView();
+
+  // Overridden from View:
+  virtual void OnViewRemoved(View* parent, View* child);
+  virtual bool OnKeyPressed(const KeyEvent& event);
+  virtual bool OnKeyReleased(const KeyEvent& event);
+  virtual bool OnMouseWheel(const MouseWheelEvent& event);
+  virtual bool OnMousePressed(const MouseEvent& event);
+  virtual bool OnMouseDragged(const MouseEvent& event);
+  virtual void OnMouseReleased(const MouseEvent& event);
+  virtual void OnMouseCaptureLost();
+  virtual void OnMouseMoved(const MouseEvent& event);
+  virtual void OnMouseExited(const MouseEvent& event);
+  virtual void Paint(gfx::Canvas* canvas);
+  virtual void InvalidateRect(const gfx::Rect& invalid_rect);
+  virtual Widget* GetWidget() const;
+
+ private:
+  Widget* widget_;
+
+  // The View that the mouse was pressed down on. Used to track drag operations
+  // and to target mouse-released events at the correct view.
+  View* mouse_pressed_handler_;
+
+  // The View that the mouse is currently over. Used to track mouse-exited
+  // events as the mouse moves from view to view, and when the mouse leaves the
+  // bounds of the containing Widget.
+  View* mouse_move_handler_;
+
+  // State captured on mouse press that would be useful for a potential drag
+  // operation.
+  DragInfo drag_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(RootView);
+};
+
+}  // namespace internal
+}  // namespace ui
+
+#endif  // UI_VIEWS_WIDGET_ROOT_VIEW_H_