ui/aura/window_tree_host.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_AURA_WINDOW_TREE_HOST_H_
   6 #define UI_AURA_WINDOW_TREE_HOST_H_
   7
   8 #include <vector>
   9
  10 #include "base/event_types.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "ui/aura/aura_export.h"
  13 #include "ui/base/cursor/cursor.h"
  14 #include "ui/events/event_source.h"
  15 #include "ui/gfx/native_widget_types.h"
  16
  17 namespace gfx {
  18 class Insets;
  19 class Point;
  20 class Rect;
  21 class Size;
  22 class Transform;
  23 }
  24
  25 namespace ui {
  26 class Compositor;
  27 class EventProcessor;
  28 class ViewProp;
  29 }
  30
  31 namespace aura {
  32 namespace test {
  33 class WindowTreeHostTestApi;
  34 }
  35
  36 class WindowEventDispatcher;
  37 class WindowTreeHostObserver;
  38
  39 // WindowTreeHost bridges between a native window and the embedded RootWindow.
  40 // It provides the accelerated widget and maps events from the native os to
  41 // aura.
  42 class AURA_EXPORT WindowTreeHost {
  43  public:
  44   virtual ~WindowTreeHost();
  45
  46   // Creates a new WindowTreeHost. The caller owns the returned value.
  47   static WindowTreeHost* Create(const gfx::Rect& bounds);
  48
  49   // Returns the WindowTreeHost for the specified accelerated widget, or NULL
  50   // if there is none associated.
  51   static WindowTreeHost* GetForAcceleratedWidget(gfx::AcceleratedWidget widget);
  52
  53   void InitHost();
  54
  55   void InitCompositor();
  56
  57   void AddObserver(WindowTreeHostObserver* observer);
  58   void RemoveObserver(WindowTreeHostObserver* observer);
  59
  60   Window* window() { return window_; }
  61   const Window* window() const { return window_; }
  62
  63   ui::EventProcessor* event_processor();
  64
  65   WindowEventDispatcher* dispatcher() {
  66     return const_cast<WindowEventDispatcher*>(
  67         const_cast<const WindowTreeHost*>(this)->dispatcher());
  68   }
  69   const WindowEventDispatcher* dispatcher() const { return dispatcher_.get(); }
  70
  71   ui::Compositor* compositor() { return compositor_.get(); }
  72
  73   // Gets/Sets the root window's transform.
  74   virtual gfx::Transform GetRootTransform() const;
  75   virtual void SetRootTransform(const gfx::Transform& transform);
  76   virtual gfx::Transform GetInverseRootTransform() const;
  77
  78   // Updates the root window's size using |host_size|, current
  79   // transform and insets.
  80   virtual void UpdateRootWindowSize(const gfx::Size& host_size);
  81
  82   // Returns the actual size of the screen.
  83   // (gfx::Screen only reports on the virtual desktop exposed by Aura.)
  84   static gfx::Size GetNativeScreenSize();
  85
  86   // Converts |point| from the root window's coordinate system to native
  87   // screen's.
  88   void ConvertPointToNativeScreen(gfx::Point* point) const;
  89
  90   // Converts |point| from native screen coordinate system to the root window's.
  91   void ConvertPointFromNativeScreen(gfx::Point* point) const;
  92
  93   // Converts |point| from the root window's coordinate system to the
  94   // host window's.
  95   void ConvertPointToHost(gfx::Point* point) const;
  96
  97   // Converts |point| from the host window's coordinate system to the
  98   // root window's.
  99   void ConvertPointFromHost(gfx::Point* point) const;
 100
 101   // Cursor.
 102   // Sets the currently-displayed cursor. If the cursor was previously hidden
 103   // via ShowCursor(false), it will remain hidden until ShowCursor(true) is
 104   // called, at which point the cursor that was last set via SetCursor() will be
 105   // used.
 106   void SetCursor(gfx::NativeCursor cursor);
 107
 108   // Invoked when the cursor's visibility has changed.
 109   void OnCursorVisibilityChanged(bool visible);
 110
 111   // Moves the cursor to the specified location relative to the root window.
 112   void MoveCursorTo(const gfx::Point& location);
 113
 114   // Moves the cursor to the |host_location| given in host coordinates.
 115   void MoveCursorToHostLocation(const gfx::Point& host_location);
 116
 117   gfx::NativeCursor last_cursor() const { return last_cursor_; }
 118
 119   // Returns the EventSource responsible for dispatching events to the window
 120   // tree.
 121   virtual ui::EventSource* GetEventSource() = 0;
 122
 123   // Returns the accelerated widget.
 124   virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
 125
 126   // Shows the WindowTreeHost.
 127   virtual void Show() = 0;
 128
 129   // Hides the WindowTreeHost.
 130   virtual void Hide() = 0;
 131
 132   // Gets/Sets the size of the WindowTreeHost.
 133   virtual gfx::Rect GetBounds() const = 0;
 134   virtual void SetBounds(const gfx::Rect& bounds) = 0;
 135
 136   // Sets the OS capture to the root window.
 137   virtual void SetCapture() = 0;
 138
 139   // Releases OS capture of the root window.
 140   virtual void ReleaseCapture() = 0;
 141
 142   // Posts |native_event| to the platform's event queue.
 143   virtual void PostNativeEvent(const base::NativeEvent& native_event) = 0;
 144
 145   // Called when the device scale factor of the root window has chagned.
 146   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) = 0;
 147
 148  protected:
 149   friend class TestScreen;  // TODO(beng): see if we can remove/consolidate.
 150
 151   WindowTreeHost();
 152   void DestroyCompositor();
 153   void DestroyDispatcher();
 154
 155   void CreateCompositor(gfx::AcceleratedWidget accelerated_widget);
 156
 157   // Returns the location of the RootWindow on native screen.
 158   virtual gfx::Point GetLocationOnNativeScreen() const = 0;
 159
 160   void OnHostMoved(const gfx::Point& new_location);
 161   void OnHostResized(const gfx::Size& new_size);
 162   void OnHostCloseRequested();
 163   void OnHostActivated();
 164   void OnHostLostWindowCapture();
 165
 166   // Sets the currently displayed cursor.
 167   virtual void SetCursorNative(gfx::NativeCursor cursor) = 0;
 168
 169   // Moves the cursor to the specified location relative to the root window.
 170   virtual void MoveCursorToNative(const gfx::Point& location) = 0;
 171
 172   // kCalled when the cursor visibility has changed.
 173   virtual void OnCursorVisibilityChangedNative(bool show) = 0;
 174
 175  private:
 176   friend class test::WindowTreeHostTestApi;
 177
 178   // Moves the cursor to the specified location. This method is internally used
 179   // by MoveCursorTo() and MoveCursorToHostLocation().
 180   void MoveCursorToInternal(const gfx::Point& root_location,
 181                             const gfx::Point& host_location);
 182
 183   // We don't use a scoped_ptr for |window_| since we need this ptr to be valid
 184   // during its deletion. (Window's dtor notifies observers that may attempt to
 185   // reach back up to access this object which will be valid until the end of
 186   // the dtor).
 187   Window* window_;  // Owning.
 188
 189   ObserverList<WindowTreeHostObserver> observers_;
 190
 191   scoped_ptr<WindowEventDispatcher> dispatcher_;
 192
 193   scoped_ptr<ui::Compositor> compositor_;
 194
 195   // Last cursor set.  Used for testing.
 196   gfx::NativeCursor last_cursor_;
 197   gfx::Point last_cursor_request_position_in_host_;
 198
 199   scoped_ptr<ui::ViewProp> prop_;
 200
 201   DISALLOW_COPY_AND_ASSIGN(WindowTreeHost);
 202 };
 203
 204 }  // namespace aura
 205
 206 #endif  // UI_AURA_WINDOW_TREE_HOST_H_