Add delay before a panel in title only mode goes back to minimized on Linux.

chrome/browser/ui/panels/panel_manager.cc

 // 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/ui/panels/panel_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 26 matching lines @@
 
 // Occasionally some system, like Windows, might not bring up or down the bottom
 // bar when the mouse enters or leaves the bottom screen area. This is the
 // maximum time we will wait for the bottom bar visibility change notification.
 // After the time expires, we bring up/down the titlebars as planned.
 const int kMaxMillisecondsWaitForBottomBarVisibilityChange = 1000;
 
 // See usage below.
 #if defined(OS_MACOSX)
 const int kMillisecondsBeforeCollapsingFromTitleOnlyState = 3000;
+#elif defined(TOOLKIT_GTK)
+const int kMillisecondsBeforeCollapsingFromTitleOnlyState = 2000;
 #else
 const int kMillisecondsBeforeCollapsingFromTitleOnlyState = 0;
 #endif
 }  // namespace
 
 // static
 PanelManager* PanelManager::GetInstance() {
   static base::LazyInstance<PanelManager> instance = LAZY_INSTANCE_INITIALIZER;
   return instance.Pointer();
 }
@@ skipping 385 matching lines @@
       task_delay_milliseconds =
           kMaxMillisecondsWaitForBottomBarVisibilityChange;
     }
   }
 
   // On some OSes, the interaction with native Taskbars/Docks may be improved
   // if the panels do not go back to minimized state too fast. For example,
   // it makes it possible to hit the titlebar on OSX if Dock has Magnifying
   // enabled - the panels stay up for a while after Dock magnification effect
   // stops covering the panels.
+  //
+  // Another example would be taskbar in auto-hide mode on Linux. In this mode
+  // taskbar will cover the panel in title hover mode, leaving it up for a few
+  // seconds would allow the user to be able to click on it.
+  //
   // Currently, no platforms use both delays.
   DCHECK(task_delay_milliseconds == 0);
   if (!bring_up)
     task_delay_milliseconds = kMillisecondsBeforeCollapsingFromTitleOnlyState;
 
   // OnAutoHidingDesktopBarVisibilityChanged will handle this.
   delayed_titlebar_action_ = bring_up ? BRING_UP : BRING_DOWN;
   if (remove_delays_for_testing_)
     task_delay_milliseconds = 0;
 
@@ skipping 146 matching lines @@
 
   // Start from the bottom to avoid reshuffling.
   for (Panels::reverse_iterator iter = panels_copy.rbegin();
        iter != panels_copy.rend(); ++iter)
     (*iter)->Close();
 }
 
 bool PanelManager::is_dragging_panel() const {
   return dragging_panel_index_ != kInvalidPanelIndex;
 }