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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_MESSAGE_CENTER_WIDGET_DELEGATE_H_
      6 #define CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_MESSAGE_CENTER_WIDGET_DELEGATE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "base/strings/string16.h"
     12 #include "ui/gfx/point.h"
     13 #include "ui/gfx/rect.h"
     14 #include "ui/message_center/message_center.h"
     15 #include "ui/message_center/message_center_tray.h"
     16 #include "ui/message_center/message_center_tray_delegate.h"
     17 #include "ui/message_center/views/message_center_view.h"
     18 #include "ui/views/widget/widget_delegate.h"
     19 #include "ui/views/widget/widget_observer.h"
     20 
     21 namespace message_center {
     22 
     23 enum Alignment {
     24   ALIGNMENT_TOP = 1 << 0,
     25   ALIGNMENT_LEFT = 1 << 1,
     26   ALIGNMENT_BOTTOM = 1 << 2,
     27   ALIGNMENT_RIGHT = 1 << 3,
     28   ALIGNMENT_NONE = 1 << 4,
     29 };
     30 
     31 struct PositionInfo {
     32   int max_height;
     33 
     34   // Alignment of the message center relative to the center of the screen.
     35   Alignment message_center_alignment;
     36 
     37   // Alignment of the taskbar relative to the center of the screen.
     38   Alignment taskbar_alignment;
     39 
     40   // Point relative to which message center is positioned.
     41   gfx::Point inital_anchor_point;
     42 };
     43 
     44 class WebNotificationTray;
     45 class MessageCenterFrameView;
     46 
     47 // MessageCenterWidgetDelegate is the message center's client view. It also
     48 // creates the message center widget and sets the notifications.
     49 //
     50 ////////////////////////////////////////////////////////////////////////////////
     51 class MessageCenterWidgetDelegate : public views::WidgetDelegate,
     52                                     public message_center::MessageCenterView,
     53                                     public views::WidgetObserver {
     54  public:
     55   MessageCenterWidgetDelegate(WebNotificationTray* tray,
     56                               MessageCenterTray* mc_tray,
     57                               bool initially_settings_visible,
     58                               const PositionInfo& pos_info,
     59                               const base::string16& title);
     60   virtual ~MessageCenterWidgetDelegate();
     61 
     62   // WidgetDelegate overrides:
     63   virtual View* GetContentsView() OVERRIDE;
     64   virtual views::NonClientFrameView* CreateNonClientFrameView(
     65       views::Widget* widget) OVERRIDE;
     66   virtual void DeleteDelegate() OVERRIDE;
     67   virtual views::Widget* GetWidget() OVERRIDE;
     68   virtual const views::Widget* GetWidget() const OVERRIDE;
     69 
     70   // WidgetObserver overrides:
     71   virtual void OnWidgetActivationChanged(views::Widget* widget,
     72                                          bool active) OVERRIDE;
     73   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
     74 
     75   // View overrides:
     76   virtual void PreferredSizeChanged() OVERRIDE;
     77   virtual gfx::Size GetPreferredSize() const OVERRIDE;
     78   virtual gfx::Size GetMaximumSize() const OVERRIDE;
     79   virtual int GetHeightForWidth(int width) const OVERRIDE;
     80   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
     81 
     82  private:
     83   // Creates and initializes the message center widget.
     84   void InitWidget();
     85 
     86   // Shifts the message center anchor point such that the mouse click point is
     87   // along the middle 60% of the width of the message center if taskbar is
     88   // horizontal aligned. If vertically aligned, ensures that mouse click point
     89   // is along the height of the message center (at least at a corner).
     90   gfx::Point GetCorrectedAnchor(gfx::Size calculated_size);
     91 
     92   // Calculates the message center bounds using the position info and the
     93   // corrected anchor.
     94   gfx::Rect GetMessageCenterBounds();
     95 
     96   // Insets of the message center border (set in MessageCenterFrameView).
     97   gfx::Insets border_insets_;
     98 
     99   // Info necessary to calculate the estimated position of the message center.
    100   PositionInfo pos_info_;
    101 
    102   WebNotificationTray* tray_;
    103 };
    104 
    105 }  // namespace message_center
    106 
    107 #endif  // CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_MESSAGE_CENTER_WIDGET_DELEGATE_H_
    108