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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ | 5 #ifndef UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ |
6 #define UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ | 6 #define UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <map> | 9 #include <map> |
10 | 10 |
11 #include "base/memory/singleton.h" | 11 #include "base/memory/singleton.h" |
12 #include "base/synchronization/lock.h" | 12 #include "base/synchronization/lock.h" |
13 #include "ui/gfx/native_widget_types.h" | 13 #include "ui/gfx/native_widget_types.h" |
| 14 #include "ui/ui_api.h" |
14 | 15 |
15 typedef unsigned long XID; | 16 typedef unsigned long XID; |
16 struct _GtkPreserveWindow; | 17 struct _GtkPreserveWindow; |
17 | 18 |
18 // NativeViewIds are the opaque values which the renderer holds as a reference | 19 // NativeViewIds are the opaque values which the renderer holds as a reference |
19 // to a window. | 20 // to a window. |
20 // | 21 // |
21 // We could make NativeViewIds be the X id of the window. However, at the | 22 // We could make NativeViewIds be the X id of the window. However, at the |
22 // time when we need to tell the renderer about its NativeViewId, an XID isn't | 23 // time when we need to tell the renderer about its NativeViewId, an XID isn't |
23 // availible and it goes very much against the grain of the code to make it so. | 24 // availible and it goes very much against the grain of the code to make it so. |
24 // Also, we worry that GTK might choose to change the underlying X window id | 25 // Also, we worry that GTK might choose to change the underlying X window id |
25 // when, say, the widget is hidden or repacked. Finally, if we used XIDs then a | 26 // when, say, the widget is hidden or repacked. Finally, if we used XIDs then a |
26 // compromised renderer could start asking questions about any X windows on the | 27 // compromised renderer could start asking questions about any X windows on the |
27 // system. | 28 // system. |
28 // | 29 // |
29 // Thus, we have this object. It produces random NativeViewIds from GtkWidget | 30 // Thus, we have this object. It produces random NativeViewIds from GtkWidget |
30 // pointers and observes the various signals from the widget for when an X | 31 // pointers and observes the various signals from the widget for when an X |
31 // window is created, destroyed etc. Thus it provides a thread safe mapping | 32 // window is created, destroyed etc. Thus it provides a thread safe mapping |
32 // from NativeViewIds to the current XID for that widget. | 33 // from NativeViewIds to the current XID for that widget. |
33 class GtkNativeViewManager { | 34 class UI_API GtkNativeViewManager { |
34 public: | 35 public: |
35 // Returns the singleton instance. | 36 // Returns the singleton instance. |
36 static GtkNativeViewManager* GetInstance(); | 37 static GtkNativeViewManager* GetInstance(); |
37 | 38 |
38 // Must be called from the UI thread: | 39 // Must be called from the UI thread: |
39 // | 40 // |
40 // Return a NativeViewId for the given widget and attach to the various | 41 // Return a NativeViewId for the given widget and attach to the various |
41 // signals emitted by that widget. The NativeViewId is pseudo-randomly | 42 // signals emitted by that widget. The NativeViewId is pseudo-randomly |
42 // allocated so that a compromised renderer trying to guess values will fail | 43 // allocated so that a compromised renderer trying to guess values will fail |
43 // with high probability. The NativeViewId will not be reused for the | 44 // with high probability. The NativeViewId will not be reused for the |
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128 // | 129 // |
129 // An XID will map to NULL, if there is an outstanding reference but the | 130 // An XID will map to NULL, if there is an outstanding reference but the |
130 // widget was destroyed. In this case, the destruction of the X window | 131 // widget was destroyed. In this case, the destruction of the X window |
131 // is deferred to the dropping of all references. | 132 // is deferred to the dropping of all references. |
132 std::map<XID, PermanentXIDInfo> perm_xid_to_info_; | 133 std::map<XID, PermanentXIDInfo> perm_xid_to_info_; |
133 | 134 |
134 DISALLOW_COPY_AND_ASSIGN(GtkNativeViewManager); | 135 DISALLOW_COPY_AND_ASSIGN(GtkNativeViewManager); |
135 }; | 136 }; |
136 | 137 |
137 #endif // UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ | 138 #endif // UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_ |
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