Cleanup ash shelf accessor functions.

ash/shelf/shelf.h

 // Copyright 2013 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 ASH_SHELF_SHELF_H_
 #define ASH_SHELF_SHELF_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_types.h"
+#include "ash/shelf/shelf_widget.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace app_list {
 class ApplicationDragAndDropHost;
 }
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class Rect;
 }
 
 namespace views {
 class View;
 }
 
 namespace ash {
 class FocusCycler;
 class ShelfDelegate;
 class ShelfIconObserver;
 class ShelfModel;
 class ShelfView;
-class ShelfWidget;
 
 namespace test {
 class ShelfTestAPI;
 }
 
-
 class ASH_EXPORT Shelf {
  public:
   static const char kNativeViewName[];
 
   Shelf(ShelfModel* model, ShelfDelegate* delegate, ShelfWidget* widget);
   virtual ~Shelf();
 
   // Return the shelf for the primary display. NULL if no user is logged in yet.
   static Shelf* ForPrimaryDisplay();
 
   // Return the shelf for the display that |window| is currently on, or a shelf
-  // on primary display if the shelf per display feature  is disabled. NULL if
-  // no user is logged in yet.
-  static Shelf* ForWindow(aura::Window* window);
+  // on primary display if the shelf per display feature is disabled. NULL if no
+  // user is logged in yet.
+  static Shelf* ForWindow(const aura::Window* window);
 
   void SetAlignment(ShelfAlignment alignment);
   ShelfAlignment alignment() const { return alignment_; }
+  bool IsHorizontalAlignment() const;
+
+  // A helper functions that chooses values specific to a shelf alignment.
+  template <typename T>
+  T SelectValueForShelfAlignment(T bottom, T left, T right, T top) const {
+    switch (alignment_) {
+      case SHELF_ALIGNMENT_BOTTOM:
+        return bottom;
+      case SHELF_ALIGNMENT_LEFT:
+        return left;
+      case SHELF_ALIGNMENT_RIGHT:
+        return right;
+      case SHELF_ALIGNMENT_TOP:
+        return top;
+    }
+    NOTREACHED();
+    return right;
+  }
+
+  // A helper functions that chooses values specific to a shelf alignment type.
+  template <typename T>
+  T PrimaryAxisValue(T horizontal, T vertical) const {
+    return IsHorizontalAlignment() ? horizontal : vertical;
+  }
 
   // Returns the screen bounds of the item for the specified window. If there is
   // no item for the specified window an empty rect is returned.
   gfx::Rect GetScreenBoundsOfItemIconForWindow(const aura::Window* window);
 
   // Updates the icon position given the current window bounds. This is used
   // when dragging panels to reposition them with respect to the other panels.
   void UpdateIconPositionForWindow(aura::Window* window);
 
   // Activates the the shelf item specified by the index in the list of shelf
@@ skipping 17 matching lines @@
   void SchedulePaint();
 
   views::View* GetAppListButtonView() const;
 
   // Launch a 0-indexed shelf item in the shelf.
   // A negative index launches the last shelf item in the shelf.
   void LaunchAppIndexAt(int item_index);
 
   ShelfWidget* shelf_widget() { return shelf_widget_; }
 
+  // TODO(msw): ShelfLayoutManager should not be accessed externally.
+  ShelfLayoutManager* shelf_layout_manager() {
+    return shelf_widget_->shelf_layout_manager();
+  }
+
   // Set the bounds of the shelf view.
   void SetShelfViewBounds(gfx::Rect bounds);
   gfx::Rect GetShelfViewBounds() const;
 
   // Returns rectangle bounding all visible shelf items. Used screen coordinate
   // system.
   gfx::Rect GetVisibleItemsBoundsInScreen() const;
 
   // Returns ApplicationDragAndDropHost for this shelf.
   app_list::ApplicationDragAndDropHost* GetDragAndDropHostForAppList();
 
  private:
   friend class test::ShelfTestAPI;
 
   // ShelfView used to display icons.
   ShelfView* shelf_view_;
 
   ShelfAlignment alignment_;
 
   ShelfDelegate* delegate_;
 
   ShelfWidget* shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(Shelf);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_H_