ui/message_center/views/popup_alignment_delegate.h

   1 // Copyright 2014 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 UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_
   6 #define UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_
   7
   8 #include "ui/message_center/message_center_export.h"
   9
  10 namespace gfx {
  11 class Display;
  12 class Point;
  13 class Rect;
  14 }
  15
  16 namespace message_center {
  17
  18 class MessagePopupCollection;
  19
  20 class MESSAGE_CENTER_EXPORT PopupAlignmentDelegate {
  21  public:
  22   PopupAlignmentDelegate();
  23
  24   void set_collection(MessagePopupCollection* collection) {
  25     collection_ = collection;
  26   }
  27
  28   // Returns the x-origin for the given toast bounds in the current work area.
  29   virtual int GetToastOriginX(const gfx::Rect& toast_bounds) const = 0;
  30
  31   // Returns the baseline height of the current work area. That is the starting
  32   // point if there are no other toasts.
  33   virtual int GetBaseLine() const = 0;
  34
  35   // Returns the height of the bottom of the current work area.
  36   virtual int GetWorkAreaBottom() const  = 0;
  37
  38   // Returns true if the toast should be aligned top down.
  39   virtual bool IsTopDown() const = 0;
  40
  41   // Returns true if the toasts are positioned at the left side of the desktop
  42   // so that their reveal animation should happen from left side.
  43   virtual bool IsFromLeft() const = 0;
  44
  45   // Called when a new toast appears or toasts are rearranged in the |display|.
  46   // The subclass may override this method to check the current desktop status
  47   // so that the toasts are arranged at the correct place.
  48   virtual void RecomputeAlignment(const gfx::Display& display) = 0;
  49
  50  protected:
  51   virtual ~PopupAlignmentDelegate();
  52
  53   void DoUpdateIfPossible();
  54
  55  private:
  56   MessagePopupCollection* collection_;
  57 };
  58
  59 }  // namespace message_center
  60
  61 #endif  // UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_