chrome/browser/fullscreen_aurax11.cc

   1 // Copyright 2014 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 <X11/Xlib.h>
   8 #include "base/basictypes.h"
   9 #include "base/logging.h"
  10 #include "ui/base/x/x11_util.h"
  11 #include "ui/gfx/rect.h"
  12
  13 namespace {
  14
  15 void EnumerateAllChildWindows(ui::EnumerateWindowsDelegate* delegate,
  16                               XID window) {
  17   std::vector<XID> windows;
  18
  19   if (!ui::GetXWindowStack(window, &windows)) {
  20     // Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back
  21     // to old school enumeration of all X windows.
  22     XID root, parent, *children;
  23     unsigned int num_children;
  24     int status = XQueryTree(gfx::GetXDisplay(), window, &root, &parent,
  25                             &children, &num_children);
  26     if (status) {
  27       for (long i = static_cast<long>(num_children) - 1; i >= 0; i--)
  28         windows.push_back(children[i]);
  29       XFree(children);
  30     }
  31   }
  32
  33   std::vector<XID>::iterator iter;
  34   for (iter = windows.begin(); iter != windows.end(); iter++) {
  35     if (delegate->ShouldStopIterating(*iter))
  36       return;
  37   }
  38 }
  39
  40 // To find the top-most window:
  41 // 1) Enumerate all top-level windows from the top to the bottom.
  42 // 2) For each window:
  43 //    2.1) If it is hidden, continue the iteration.
  44 //    2.2) If it is managed by the Window Manager (has a WM_STATE property).
  45 //         Return this window as the top-most window.
  46 //    2.3) Enumerate all its child windows. If there is a child window that is
  47 //         managed by the Window Manager (has a WM_STATE property). Return this
  48 //         child window as the top-most window.
  49 //    2.4) Otherwise, continue the iteration.
  50
  51 class WindowManagerWindowFinder : public ui::EnumerateWindowsDelegate {
  52  public:
  53   WindowManagerWindowFinder() : window_(None) { }
  54
  55   XID window() const { return window_; }
  56
  57  protected:
  58   virtual bool ShouldStopIterating(XID window) OVERRIDE {
  59     if (ui::PropertyExists(window, "WM_STATE")) {
  60       window_ = window;
  61       return true;
  62     }
  63     return false;
  64   }
  65
  66  private:
  67   XID window_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(WindowManagerWindowFinder);
  70 };
  71
  72 class TopMostWindowFinder : public ui::EnumerateWindowsDelegate {
  73  public:
  74   TopMostWindowFinder()
  75       : top_most_window_(None) {}
  76
  77   XID top_most_window() const { return top_most_window_; }
  78
  79  protected:
  80   virtual bool ShouldStopIterating(XID window) OVERRIDE {
  81      if (!ui::IsWindowVisible(window))
  82        return false;
  83      if (ui::PropertyExists(window, "WM_STATE")) {
  84       top_most_window_ = window;
  85       return true;
  86      }
  87
  88      WindowManagerWindowFinder child_finder;
  89      EnumerateAllChildWindows(&child_finder, window);
  90      XID child_window = child_finder.window();
  91      if (child_window == None)
  92        return false;
  93      top_most_window_ = child_window;
  94      return true;
  95   }
  96
  97  private:
  98   XID top_most_window_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(TopMostWindowFinder);
 101 };
 102
 103 bool IsTopMostWindowFullScreen() {
 104   // Find the topmost window
 105   TopMostWindowFinder finder;
 106   EnumerateAllChildWindows(&finder, ui::GetX11RootWindow());
 107   XID window = finder.top_most_window();
 108   if (window == None)
 109     return false;
 110
 111   // Make sure it is not the desktop window.
 112   int window_desktop;
 113   if (!ui::GetWindowDesktop(window, &window_desktop))
 114     return false;
 115
 116   return ui::IsX11WindowFullScreen(window);
 117 }
 118
 119 }  // namespace
 120
 121 bool IsFullScreenMode() {
 122   return IsTopMostWindowFullScreen();
 123 }