Add workspace to desktop

ui/aura_shell/workspace/workspace_manager.h

Index: ui/aura_shell/workspace/workspace_manager.h
diff --git a/ui/aura_shell/workspace/workspace_manager.h b/ui/aura_shell/workspace/workspace_manager.h
index 48f9d2d4dd0303108f8a8391223c2b754bd0d5c2..925fea24925d445180e7eb5e2fb4385bb8f81b26 100644
--- a/ui/aura_shell/workspace/workspace_manager.h
+++ b/ui/aura_shell/workspace/workspace_manager.h
@@ -8,20 +8,29 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "ui/aura/desktop_observer.h"
 #include "ui/aura_shell/aura_shell_export.h"
+#include "ui/gfx/insets.h"
 #include "ui/gfx/size.h"
 
 namespace aura {
 class Window;
 }
 
+namespace gfx {
+class Point;
+class Rect;
+}
+
 namespace aura_shell {
 class Workspace;
 
 // WorkspaceManager manages multiple workspaces in the desktop.
-class AURA_SHELL_EXPORT WorkspaceManager {
+class AURA_SHELL_EXPORT WorkspaceManager : public aura::DesktopObserver {
  public:
-  explicit WorkspaceManager();
+  explicit WorkspaceManager(aura::Window* viewport);
   virtual ~WorkspaceManager();
 
   // Create new workspace. Workspace objects are managed by
@@ -36,17 +45,23 @@ class AURA_SHELL_EXPORT WorkspaceManager {
   Workspace* FindBy(aura::Window* window) const;
 
   // Sets the bounds of all workspaces.
-  void Layout();
+  void LayoutWorkspaces();
+
+  // Returns the bounds in which a window can be moved/resized.
+  gfx::Rect GetDragAreaBounds();
 
-  // Returns the total width of all workspaces.
-  int GetTotalWidth() const;
+  // Turn on/off overview mode.
+  void SetOverview(bool overview);
+  bool is_overview() const { return is_overview_; }
 
-  // Sets/gets the size of the workspace.
-  void set_workspace_size(const gfx::Size& size) { workspace_size_ = size; }
-  const gfx::Size& workspace_size() const { return workspace_size_; }
+  // Overridden from aura::DesktopObserver:
+  virtual void OnDesktopResized(const gfx::Size& new_size) OVERRIDE;
+  virtual void OnActiveWindowChanged(aura::Window* active) OVERRIDE;
 
  private:
   friend class Workspace;
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceManagerTest, Overview);
+  FRIEND_TEST_ALL_PREFIXES(WorkspaceManagerTest, LayoutWorkspaces);
 
   void AddWorkspace(Workspace* workspace);
   void RemoveWorkspace(Workspace* workspace);
@@ -54,12 +69,25 @@ class AURA_SHELL_EXPORT WorkspaceManager {
   // Sets the active workspace.
   void SetActiveWorkspace(Workspace* workspace);
 
-  gfx::Size workspace_size_;
+  // Returns the bounds of the work are given |workspace_bounds|.
+  gfx::Rect GetWorkAreaBounds(const gfx::Rect& workspace_bounds);
+
+  // Update viewport size and move to the active workspace.
+  void UpdateViewport();
+
+  aura::Window* viewport_;
 
   Workspace* active_workspace_;
 
   std::vector<Workspace*> workspaces_;
 
+  // The size of a single workspace. This is generally the same as the size of
+  // monitor.
+  gfx::Size workspace_size_;
+
+  // True if the workspace manager is in overview mode.
+  bool is_overview_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceManager);
 };