blob: c7e21903f88aadefa64db0c739dd0cbf22d04a1f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef VIEWS_LAYOUT_MANAGER_H_
#define VIEWS_LAYOUT_MANAGER_H_
#pragma once
#include "views/view.h"
namespace gfx {
class Size;
}
namespace views {
class View;
/////////////////////////////////////////////////////////////////////////////
//
// LayoutManager interface
//
// The LayoutManager interface provides methods to handle the sizing of
// the children of a View according to implementation-specific heuristics.
//
/////////////////////////////////////////////////////////////////////////////
class LayoutManager {
public:
virtual ~LayoutManager() {}
// Notification that this LayoutManager has been installed on a particular
// host.
virtual void Installed(View* host) {}
// Notification that this LayoutManager has been uninstalled on a particular
// host.
virtual void Uninstalled(View* host) {}
// Lay out the children of |host| according to implementation-specific
// heuristics. The graphics used during painting is provided to allow for
// string sizing.
virtual void Layout(View* host) = 0;
// Return the preferred size which is the size required to give each
// children their respective preferred size.
virtual gfx::Size GetPreferredSize(View* host) = 0;
// Returns the preferred height for the specified width. The default
// implementation returns the value from GetPreferredSize.
virtual int GetPreferredHeightForWidth(View* host, int width);
// Notification that a view has been added.
virtual void ViewAdded(View* host, View* view) {}
// Notification that a view has been removed.
virtual void ViewRemoved(View* host, View* view) {}
};
} // namespace views
#endif // VIEWS_LAYOUT_MANAGER_H_
|
