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| 1 // Copyright (c) 2011 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_VIEWS_LAYOUT_LAYOUT_MANAGER_H_ |
| 6 #define UI_VIEWS_LAYOUT_LAYOUT_MANAGER_H_ |
| 7 #pragma once |
| 8 |
| 9 namespace gfx { |
| 10 class Size; |
| 11 } |
| 12 |
| 13 namespace ui { |
| 14 |
| 15 class View; |
| 16 |
| 17 //////////////////////////////////////////////////////////////////////////////// |
| 18 // LayoutManager interface |
| 19 // |
| 20 // An interface implemented by an object that manages sizing of a View's |
| 21 // children. |
| 22 // |
| 23 class LayoutManager { |
| 24 public: |
| 25 virtual ~LayoutManager() {} |
| 26 |
| 27 // Notification that this LayoutManager has been installed on a particular |
| 28 // host. |
| 29 virtual void Installed(View* host) {} |
| 30 |
| 31 // Notification that this LayoutManager has been uninstalled on a particular |
| 32 // host. |
| 33 virtual void Uninstalled(View* host) {} |
| 34 |
| 35 // Lay out the children of |host| according to implementation-specific |
| 36 // heuristics. The graphics used during painting is provided to allow for |
| 37 // string sizing. |
| 38 virtual void Layout(View* host) = 0; |
| 39 |
| 40 // Return the preferred size which is the size required to give each |
| 41 // children their respective preferred size. |
| 42 virtual gfx::Size GetPreferredSize(View* host) = 0; |
| 43 |
| 44 // Returns the preferred height for the specified width. The default |
| 45 // implementation returns the value from GetPreferredSize. |
| 46 virtual int GetPreferredHeightForWidth(View* host, int width); |
| 47 |
| 48 // Notification that a view has been added. |
| 49 virtual void ViewAdded(View* host, View* view) {} |
| 50 |
| 51 // Notification that a view has been removed. |
| 52 virtual void ViewRemoved(View* host, View* view) {} |
| 53 }; |
| 54 |
| 55 } // namespace ui |
| 56 |
| 57 #endif // UI_VIEWS_LAYOUT_LAYOUT_MANAGER_H_ |
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