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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 #include "chrome/browser/fullscreen.h" | |
6 | |
7 #include <gdk/gdk.h> | |
8 #include <gdk/gdkx.h> | |
9 | |
10 #include <algorithm> | |
11 #include <vector> | |
12 | |
13 #include "base/basictypes.h" | |
14 #include "ui/base/x/x11_util.h" | |
15 #include "ui/gfx/rect.h" | |
16 | |
17 namespace { | |
18 | |
19 // TODO (jianli): Merge with ui::EnumerateTopLevelWindows. | |
20 void EnumerateAllChildWindows(ui::EnumerateWindowsDelegate* delegate, | |
21 XID window) { | |
22 std::vector<XID> windows; | |
23 | |
24 if (!ui::GetXWindowStack(window, &windows)) { | |
25 // Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back | |
26 // to old school enumeration of all X windows. | |
27 XID root, parent, *children; | |
28 unsigned int num_children; | |
29 int status = XQueryTree(gfx::GetXDisplay(), window, &root, &parent, | |
30 &children, &num_children); | |
31 if (status) { | |
32 for (long i = static_cast<long>(num_children) - 1; i >= 0; i--) | |
33 windows.push_back(children[i]); | |
34 XFree(children); | |
35 } | |
36 } | |
37 | |
38 std::vector<XID>::iterator iter; | |
39 for (iter = windows.begin(); iter != windows.end(); iter++) { | |
40 if (delegate->ShouldStopIterating(*iter)) | |
41 return; | |
42 } | |
43 } | |
44 | |
45 // To find the top-most window: | |
46 // 1) Enumerate all top-level windows from the top to the bottom. | |
47 // 2) For each window: | |
48 // 2.1) If it is hidden, continue the iteration. | |
49 // 2.2) If it is managed by the Window Manager (has a WM_STATE property). | |
50 // Return this window as the top-most window. | |
51 // 2.3) Enumerate all its child windows. If there is a child window that is | |
52 // managed by the Window Manager (has a WM_STATE property). Return this | |
53 // child window as the top-most window. | |
54 // 2.4) Otherwise, continue the iteration. | |
55 | |
56 class WindowManagerWindowFinder : public ui::EnumerateWindowsDelegate { | |
57 public: | |
58 WindowManagerWindowFinder() : window_(None) { } | |
59 | |
60 XID window() const { return window_; } | |
61 | |
62 protected: | |
63 virtual bool ShouldStopIterating(XID window) OVERRIDE { | |
64 if (ui::PropertyExists(window, "WM_STATE")) { | |
65 window_ = window; | |
66 return true; | |
67 } | |
68 return false; | |
69 } | |
70 | |
71 private: | |
72 XID window_; | |
73 | |
74 DISALLOW_COPY_AND_ASSIGN(WindowManagerWindowFinder); | |
75 }; | |
76 | |
77 class TopMostWindowFinder : public ui::EnumerateWindowsDelegate { | |
78 public: | |
79 TopMostWindowFinder() | |
80 : top_most_window_(None) {} | |
81 | |
82 XID top_most_window() const { return top_most_window_; } | |
83 | |
84 protected: | |
85 virtual bool ShouldStopIterating(XID window) OVERRIDE { | |
86 if (!ui::IsWindowVisible(window)) | |
87 return false; | |
88 if (ui::PropertyExists(window, "WM_STATE")) { | |
89 top_most_window_ = window; | |
90 return true; | |
91 } | |
92 WindowManagerWindowFinder child_finder; | |
93 EnumerateAllChildWindows(&child_finder, window); | |
94 XID child_window = child_finder.window(); | |
95 if (child_window == None) | |
96 return false; | |
97 top_most_window_ = child_window; | |
98 return true; | |
99 } | |
100 | |
101 private: | |
102 XID top_most_window_; | |
103 | |
104 DISALLOW_COPY_AND_ASSIGN(TopMostWindowFinder); | |
105 }; | |
106 | |
107 bool IsTopMostWindowFullScreen() { | |
108 // Find the topmost window. | |
109 TopMostWindowFinder finder; | |
110 EnumerateAllChildWindows(&finder, ui::GetX11RootWindow()); | |
111 XID window = finder.top_most_window(); | |
112 if (window == None) | |
113 return false; | |
114 | |
115 // Make sure it is not the desktop window. | |
116 static Atom desktop_atom = gdk_x11_get_xatom_by_name_for_display( | |
117 gdk_display_get_default(), "_NET_WM_WINDOW_TYPE_DESKTOP"); | |
118 | |
119 std::vector<Atom> atom_properties; | |
120 if (ui::GetAtomArrayProperty(window, | |
121 "_NET_WM_WINDOW_TYPE", | |
122 &atom_properties) && | |
123 std::find(atom_properties.begin(), atom_properties.end(), desktop_atom) | |
124 != atom_properties.end()) | |
125 return false; | |
126 | |
127 // If it is a GDK window, check it using gdk function. | |
128 GdkWindow* gwindow = gdk_window_lookup(window); | |
129 if (gwindow && window != GDK_ROOT_WINDOW()) | |
130 return gdk_window_get_state(gwindow) == GDK_WINDOW_STATE_FULLSCREEN; | |
131 | |
132 // Otherwise, do the check via xlib function. | |
133 return ui::IsX11WindowFullScreen(window); | |
134 } | |
135 | |
136 } | |
137 | |
138 bool IsFullScreenMode() { | |
139 gdk_error_trap_push(); | |
140 bool result = IsTopMostWindowFullScreen(); | |
141 bool got_error = gdk_error_trap_pop(); | |
142 return result && !got_error; | |
143 } | |
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