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_ 59
