Applied review comments from oshima for CL 7850026.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7945014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@101983 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 50 insertions, 0 deletions

diff --git a/chrome/browser/screensaver_window_finder_gtk.cc b/chrome/browser/screensaver_window_finder_gtk.cc
new file mode 100644
index 0000000..a94f323
--- /dev/null
+++ b/chrome/browser/screensaver_window_finder_gtk.cc
@@ -0,0 +1,50 @@
+// Copyright (c) 2011 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.
+
+#include "chrome/browser/screensaver_window_finder_gtk.h"
+
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+
+#include "base/basictypes.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "ui/base/x/x11_util.h"
+
+
+ScreensaverWindowFinder::ScreensaverWindowFinder()
+    : exists_(false) {
+}
+
+bool ScreensaverWindowFinder::ScreensaverWindowExists() {
+  gdk_error_trap_push();
+  ScreensaverWindowFinder finder;
+  gtk_util::EnumerateTopLevelWindows(&finder);
+  bool got_error = gdk_error_trap_pop();
+  return finder.exists_ && !got_error;
+}
+
+bool ScreensaverWindowFinder::ShouldStopIterating(XID window) {
+  if (!ui::IsWindowVisible(window) || !IsScreensaverWindow(window))
+    return false;
+  exists_ = true;
+  return true;
+}
+
+bool ScreensaverWindowFinder::IsScreensaverWindow(XID window) const {
+  // It should occupy the full screen.
+  if (!ui::IsX11WindowFullScreen(window))
+    return false;
+
+  // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
+  if (ui::PropertyExists(window, "_SCREENSAVER_VERSION"))
+    return true;
+
+  // For all others, like gnome-screensaver, the window's WM_CLASS property
+  // should contain "screensaver".
+  std::string value;
+  if (!ui::GetStringProperty(window, "WM_CLASS", &value))
+    return false;
+
+  return value.find("screensaver") != std::string::npos;
+}