Support auto-hide taskbar for panels on Windows.

chrome/browser/ui/panels/panel_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #pragma once
 
 #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"
 
 class Browser;
 class Panel;
 
 // This class manages a set of panels.
 class PanelManager {
  public:
   // Returns a single instance.
@@ skipping 14 matching lines @@
   // Drags the given panel.
   void StartDragging(Panel* panel);
   void Drag(int delta_x);
   void EndDragging(bool cancelled);
 
   // Should we bring up the titlebar, given the current mouse point?
   bool ShouldBringUpTitleBarForAllMinimizedPanels(int mouse_x,
                                                   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;
 
   PanelManager();
 
   // 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();
 
   // Does the remove. Called from Remove and DelayedRemove.
   void DoRemove(Panel* panel);
 
   // Rearranges the positions of the panels starting from the given iterator.
   // This is called when the display space has been changed, i.e. working
   // area being changed or a panel being closed.
   void Rearrange(Panels::iterator iter_to_start);
 
   // Computes the bounds for next panel.
   // |allow_size_change| is used to indicate if the panel size can be changed to
   // fall within the size constraint, e.g., when the panel is created.
   // Returns true if computed bounds are within the displayable area.
   bool ComputeBoundsForNextPanel(gfx::Rect* bounds, bool allow_size_change);
 
   // Finds one panel to close so that we may have space for the new panel
   // created by |extension|.
   void FindAndClosePanelOnOverflow(const Extension* extension);
 
   // Help functions to drag the given panel.
   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
   // when we're in the process of the dragging.
   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_;
 
   // Original x coordinate of the panel to drag. This is used to get back to
   // the original position when we cancel the dragging.
   int dragging_panel_original_x_;
 
   // Bounds of the panel to drag. It is first set to the original bounds when
   // the dragging happens. Then it is updated to the position that will be set
   // 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);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_