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 97392)
+++ chrome/browser/ui/panels/panel_manager.h	(working copy)
@@ -8,7 +8,10 @@
 
 #include <vector>
 #include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/task.h"
+#include "chrome/browser/ui/panels/auto_hide_bottom_bar.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/rect.h"
 
@@ -16,7 +19,8 @@
 class Panel;
 
 // This class manages a set of panels.
-class PanelManager {
+class PanelManager : public AutoHideBottomBar::Observer,
+                     public base::RefCountedThreadSafe<PanelManager> {
  public:
   // Returns a single instance.
   static PanelManager* GetInstance();
@@ -39,22 +43,43 @@
   void EndDragging(bool cancelled);
 
   // Should we bring up the titlebar, given the current mouse point?
-  bool ShouldBringUpTitlebarForAllMinimizedPanels(int mouse_x,
-                                                  int mouse_y) const;
+  bool ShouldBringUpTitlebars(int mouse_x, int mouse_y) const;
 
-  // Brings up or down the title-bar for all minimized panels.
-  void BringUpOrDownTitlebarForAllMinimizedPanels(bool bring_up);
+  // Brings up or down the titlebars for all minimized panels.
+  void BringUpOrDownTitlebars(bool bring_up);
 
+  // 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 GetBottomPositionForExpansionState(
+      Panel::ExpansionState expansion_state) const;
+
   int num_panels() const { return panels_.size(); }
   bool is_dragging_panel() const;
 
  private:
-  friend class PanelBrowserTest;
+  friend class BasePanelBrowserTest;
 
+  enum DelayedTitlebarAction {
+    NO_ACTION,
+    BRING_UP,
+    BRING_DOWN
+  };
+
   typedef std::vector<Panel*> Panels;
 
+  // For testing only.
+  static void CreateForTesting(const gfx::Rect& work_area,
+                               AutoHideBottomBar* auto_hide_bottom_bar);
+
   PanelManager();
+  void Init();
 
+  // Overridden from AutoHideBottomBar::Observer:
+  virtual void OnAutoHideBottomBarVisibilityChanged(
+      AutoHideBottomBar::Visibility visibility) OVERRIDE;
+  virtual void OnAutoHideBottomBarHeightChanged(int height) OVERRIDE;
+
   // Applies the new work area. This is called by OnDisplayChanged and the test
   // code.
   void SetWorkArea(const gfx::Rect& work_area);
@@ -84,6 +109,9 @@
   void DragLeft();
   void DragRight();
 
+  void DelayedBringUpOrDownTitlebarsCheck();
+  void DoBringUpOrDownTitlebars(bool bring_up);
+
   Panels panels_;
 
   // Stores the panels that are pending to remove. We want to delay the removal
@@ -91,14 +119,16 @@
   Panels panels_pending_to_remove_;
 
   // Current work area used in computing the panel bounds.
+  // If the always-on-top 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_;
 
   // 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_;
@@ -112,6 +142,12 @@
   // to when the dragging ends.
   gfx::Rect dragging_panel_bounds_;
 
+  scoped_refptr<AutoHideBottomBar> auto_hide_bottom_bar_;
+
+  DelayedTitlebarAction delayed_titlebar_action_;
+
+  ScopedRunnableMethodFactory<PanelManager> method_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };