Support auto-hide taskbar for panels on Windows.

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
===================================================================
--- chrome/browser/ui/panels/panel_manager.h	(revision 96619)
+++ chrome/browser/ui/panels/panel_manager.h	(working copy)
@@ -9,6 +9,7 @@
 #include <vector>
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/timer.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/rect.h"
 
@@ -43,12 +44,20 @@
                                                   int mouse_y) const;
 
   // Brings up or down the title-bar for all minimized panels.
-  void BringUpOrDownTitleBarForAllMinimizedPanels(bool bring_up);
+  void BringUpTitleBar();
+  void BringDownTitleBar();
 
+  // Returns the bottom position for the panel per its expansion state. If auto-
+  // hide bottom bar is present, we want to move the minimized panel to the
+  // bottom of the screen, not the bottom of the work area.
+  int GetBottomPositionPerExpansionState(
+      Panel::ExpansionState expansion_state) const;
+
   int num_panels() const { return panels_.size(); }
 
  private:
   friend class PanelBrowserTest;
+  friend class PanelBrowserViewTest;
 
   typedef std::vector<Panel*> Panels;
 
@@ -56,7 +65,7 @@
 
   // Applies the new work area. This is called by OnDisplayChanged and the test
   // code.
-  void SetWorkArea(const gfx::Rect& work_area);
+  void SetWorkArea(const gfx::Rect& work_area, int bottom_bar_height);
 
   // Handles all the panels that're delayed to be removed.
   void DelayedRemove();
@@ -83,6 +92,8 @@
   void DragLeft();
   void DragRight();
 
+  void DoBringUpOrDownTitleBar(bool bring_up);
+
   Panels panels_;
 
   // Stores the panels that are pending to remove. We want to delay the removal
@@ -90,14 +101,20 @@
   Panels panels_pending_to_remove_;
 
   // Current work area used in computing the panel bounds.
+  // If the top-most bottom bar, like Windows taskbar or MacOSX dock, is always
+  // visible, it should not be included in the work area. Otherwise, the work
+  // area includes the potential area that would  be taken by the bottom bar
+  // when it becomes visible.
   gfx::Rect work_area_;
 
+  // The height of the top-most bottom bar if it is auto-hidden. Otherwise, this
+  // value is 0.
+  int auto_hide_bottom_bar_height_;
+
   // Used in computing the bounds of the next panel.
   int max_width_;
   int max_height_;
-  int min_x_;
   int current_x_;
-  int bottom_edge_y_;
 
   // Panel to drag.
   size_t dragging_panel_index_;
@@ -111,6 +128,13 @@
   // to when the dragging ends.
   gfx::Rect dragging_panel_bounds_;
 
+  // Timer to check the visibility of auto-hide bottom bar to decide when to
+  // bring up or down the titlebar.
+  base::RepeatingTimer<PanelManager> bring_up_or_down_titlebar_timer_;
+
+  // This is only used by the testing code to disable the above check.
+  bool should_check_auto_hide_bottom_bar_on_titlebar_change_;
+
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };