All views::Window objects must have a NonClientView, regardless of whether or...

chrome/views/non_client_view.h

 // Copyright (c) 2006-2008 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 CHROME_VIEWS_NON_CLIENT_VIEW_H_
 #define CHROME_VIEWS_NON_CLIENT_VIEW_H_
 
 #include "chrome/views/view.h"
+#include "chrome/views/client_view.h"
 
 namespace gfx {
 class Path;
 }
 
 namespace views {
 
-class ClientView;
-
 ///////////////////////////////////////////////////////////////////////////////
 // NonClientView
 //
 //  An object implementing the NonClientView interface is a View that provides
 //  the "non-client" areas of a window. This is the area that typically
 //  encompasses the window frame - title bar, sizing borders and window
 //  controls. This interface provides methods that allow a specific
 //  presentation to define non-client areas for windows hit testing, the shape
 //  of the window, and other window-related information.
 //
 class NonClientView : public View {
  public:
+  NonClientView();
+  virtual ~NonClientView();
+
   // Various edges of the frame border have a 1 px shadow along their edges; in
   // a few cases we shift elements based on this amount for visual appeal.
   static const int kFrameShadowThickness;
   // In restored mode, we draw a 1 px edge around the content area inside the
   // frame border.
   static const int kClientEdgeThickness;
 
+  // Returns true if the ClientView determines that the containing window can be
+  // closed, false otherwise.
+  bool CanClose() const;
+
+  // Called by the containing Window when it is closed.
+  void WindowClosing();
+
   // Calculates the bounds of the client area of the window assuming the
   // window is sized to |width| and |height|.
-  virtual gfx::Rect CalculateClientAreaBounds(int width,
-                                              int height) const = 0;
+  virtual gfx::Rect CalculateClientAreaBounds(int width, int height) const;
 
   // Calculates the size of window required to display a client area of the
   // specified width and height.
   virtual gfx::Size CalculateWindowSizeForClientSize(int width,
-                                                     int height) const = 0;
+                                                     int height) const;
 
   // Returns the point, in screen coordinates, where the system menu should
   // be shown so it shows up anchored to the system menu icon.
-  virtual gfx::Point GetSystemMenuPoint() const = 0;
+  virtual gfx::Point GetSystemMenuPoint() const;
 
   // Determines the windows HT* code when the mouse cursor is at the
   // specified point, in window coordinates.
-  virtual int NonClientHitTest(const gfx::Point& point) = 0;
+  virtual int NonClientHitTest(const gfx::Point& point);
 
   // Returns a mask to be used to clip the top level window for the given
   // size. This is used to create the non-rectangular window shape.
   virtual void GetWindowMask(const gfx::Size& size,
-                             gfx::Path* window_mask) = 0;
+                             gfx::Path* window_mask);
 
   // Toggles the enable state for the Close button (and the Close menu item in
   // the system menu).
-  virtual void EnableClose(bool enable) = 0;
+  virtual void EnableClose(bool enable);
 
   // Tells the window controls as rendered by the NonClientView to reset
   // themselves to a normal state. This happens in situations where the
   // containing window does not receive a normal sequences of messages that
   // would lead to the controls returning to this normal state naturally, e.g.
   // when the window is maximized, minimized or restored.
-  virtual void ResetWindowControls() = 0;
+  virtual void ResetWindowControls();
 
   // Prevents the non-client view from rendering as inactive when called with
   // |disable| true, until called with false.
   void set_paint_as_active(bool paint_as_active) { 
     paint_as_active_ = paint_as_active;
   }
 
+  // Get/Set client_view property.
+  ClientView* client_view() const { return client_view_; }
+  void set_client_view(ClientView* client_view) {
+    client_view_ = client_view;
+  }
+
+  // NonClientView, View overrides:
+  virtual gfx::Size GetPreferredSize();
+  virtual void Layout();
+
  protected:
-  NonClientView() : paint_as_active_(false) {}
+  // NonClientView, View overrides:
+  virtual void ViewHierarchyChanged(bool is_add, View* parent, View* child);
 
   // Helper for non-client view implementations to determine which area of the
   // window border the specified |point| falls within. The other parameters are
   // the size of the sizing edges, and whether or not the window can be
   // resized.
   int GetHTComponentForFrame(const gfx::Point& point,
                              int top_resize_border_height,
                              int resize_border_thickness,
                              int top_resize_corner_height,
                              int resize_corner_width,
                              bool can_resize);
 
   // Accessor for paint_as_active_.
   bool paint_as_active() const { return paint_as_active_; }
 
  private:
+  // A ClientView object or subclass, responsible for sizing the contents view
+  // of the window, hit testing and perhaps other tasks depending on the
+  // implementation.
+  ClientView* client_view_;
+
   // True when the non-client view should always be rendered as if the window
   // were active, regardless of whether or not the top level window actually
   // is active.
   bool paint_as_active_;
 };
 
 }  // namespace views
 
 #endif  // #ifndef CHROME_VIEWS_NON_CLIENT_VIEW_H_