ui/aura/layout_manager.h

   1 // Copyright (c) 2012 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_AURA_LAYOUT_MANAGER_H_
   6 #define UI_AURA_LAYOUT_MANAGER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "ui/aura/aura_export.h"
  10
  11 namespace gfx {
  12 class Rect;
  13 }
  14
  15 namespace aura {
  16 class Window;
  17
  18 // An interface implemented by an object that places child windows.
  19 class AURA_EXPORT LayoutManager {
  20  public:
  21   LayoutManager();
  22   virtual ~LayoutManager();
  23
  24   // Invoked when the window is resized.
  25   virtual void OnWindowResized() = 0;
  26
  27   // Invoked when the window |child| has been added.
  28   virtual void OnWindowAddedToLayout(Window* child) = 0;
  29
  30   // Invoked prior to removing |window|.
  31   virtual void OnWillRemoveWindowFromLayout(Window* child) = 0;
  32
  33   // Invoked after removing |window|.
  34   virtual void OnWindowRemovedFromLayout(Window* child) = 0;
  35
  36   // Invoked when the |SetVisible()| is invoked on the window |child|.
  37   // |visible| is the value supplied to |SetVisible()|. If |visible| is true,
  38   // window->IsVisible() may still return false. See description in
  39   // Window::IsVisible() for details.
  40   virtual void OnChildWindowVisibilityChanged(Window* child, bool visible) = 0;
  41
  42   // Invoked when |Window::SetBounds| is called on |child|.
  43   // Implementation must call |SetChildBoundsDirect| to change the
  44   // |child|'s bounds. LayoutManager may modify |requested_bounds|
  45   // before applying, or ignore the request.
  46   virtual void SetChildBounds(Window* child,
  47                               const gfx::Rect& requested_bounds) = 0;
  48
  49  protected:
  50   // Sets the child's bounds forcibly. LayoutManager is responsible
  51   // for checking the state and make sure the bounds are correctly
  52   // adjusted.
  53   void SetChildBoundsDirect(aura::Window* child, const gfx::Rect& bounds);
  54 };
  55
  56 }  // namespace aura
  57
  58 #endif  // UI_AURA_LAYOUT_MANAGER_H_