MacViews: Implement Tab Dragging

ui/views/cocoa/bridged_native_widget.h

 // Copyright 2014 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 UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
 #define UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 16 matching lines @@
 namespace ui {
 class InputMethod;
 }
 
 namespace views {
 namespace test {
 class BridgedNativeWidgetTestApi;
 }
 
 class CocoaMouseCapture;
+class CocoaWindowMoveLoop;
 class NativeWidgetMac;
 class View;
 
 // A bridge to an NSWindow managed by an instance of NativeWidgetMac or
 // DesktopNativeWidgetMac. Serves as a helper class to bridge requests from the
 // NativeWidgetMac to the Cocoa window. Behaves a bit like an aura::Window.
 class VIEWS_EXPORT BridgedNativeWidget
     : public ui::LayerDelegate,
       public ui::LayerOwner,
       public ui::internal::InputMethodDelegate,
@@ skipping 45 matching lines @@
   // Sets the desired visibility of the window and updates the visibility of
   // descendant windows where necessary.
   void SetVisibilityState(WindowVisibilityState new_state);
 
   // Acquiring mouse capture first steals capture from any existing
   // CocoaMouseCaptureDelegate, then captures all mouse events until released.
   void AcquireCapture();
   void ReleaseCapture();
   bool HasCapture();
 
+  // Start moving the window, pinned to the mouse cursor, and monitor events.
+  // Return MOVE_LOOP_SUCCESSFUL on mouse up or MOVE_LOOP_CANCELED on premature
+  // termination via EndMoveLoop() or when window is destroyed during the drag.
+  Widget::MoveLoopResult RunMoveLoop(const gfx::Vector2d& drag_offset);
+  void EndMoveLoop();
+
   // See views::Widget.
   void SetNativeWindowProperty(const char* key, void* value);
   void* GetNativeWindowProperty(const char* key) const;
 
   // Sets the cursor associated with the NSWindow. Retains |cursor|.
   void SetCursor(NSCursor* cursor);
 
   // Called internally by the NSWindowDelegate when the window is closing.
   void OnWindowWillClose();
 
   // Called by the NSWindowDelegate when a fullscreen operation begins. If
   // |target_fullscreen_state| is true, the target state is fullscreen.
   // Otherwise, a transition has begun to come out of fullscreen.
   void OnFullscreenTransitionStart(bool target_fullscreen_state);
 
   // Called when a fullscreen transition completes. If target_fullscreen_state()
   // does not match |actual_fullscreen_state|, a new transition will begin.
   void OnFullscreenTransitionComplete(bool actual_fullscreen_state);
 
   // Transition the window into or out of fullscreen. This will immediately
   // invert the value of target_fullscreen_state().
   void ToggleDesiredFullscreenState();
 
   // Called by the NSWindowDelegate when the size of the window changes.
   void OnSizeChanged();
 
+  // Called once by the NSWindowDelegate when the position of the window has
+  // changed.
+  void OnPositionChanged();
+
   // Called by the NSWindowDelegate when the visibility of the window may have
   // changed. For example, due to a (de)miniaturize operation, or the window
   // being reordered in (or out of) the screen list.
   void OnVisibilityChanged();
 
   // Explicitly set the visibility. This is called when Cocoa requests a draw,
   // but hasn't updated the value of -[NSWindow isVisible] yet.
   void OnVisibilityChangedTo(bool new_visibility);
 
   // Called by the NSWindowDelegate on a scale factor or color space change.
@@ skipping 42 matching lines @@
   }
 
   bool target_fullscreen_state() const { return target_fullscreen_state_; }
   bool window_visible() { return window_visible_; }
 
   // Overridden from ui::internal::InputMethodDelegate:
   ui::EventDispatchDetails DispatchKeyEventPostIME(ui::KeyEvent* key) override;
 
  private:
   friend class test::BridgedNativeWidgetTestApi;
+  friend class CocoaWindowMoveLoop;
 
   // Closes all child windows. BridgedNativeWidget children will be destroyed.
   void RemoveOrDestroyChildren();
 
   // Notify descendants of a visibility change.
   void NotifyVisibilityChangeDown();
 
   // Essentially NativeWidgetMac::GetClientAreaBoundsInScreen().size(), but no
   // coordinate transformations are required from AppKit coordinates.
   gfx::Size GetClientAreaSize() const;
@@ skipping 55 matching lines @@
   gfx::Vector2d GetChildWindowOffset() const override;
   bool IsVisibleParent() const override;
   void RemoveChildWindow(BridgedNativeWidget* child) override;
 
   views::NativeWidgetMac* native_widget_mac_;  // Weak. Owns this.
   base::scoped_nsobject<NSWindow> window_;
   base::scoped_nsobject<ViewsNSWindowDelegate> window_delegate_;
   base::scoped_nsobject<BridgedContentView> bridged_view_;
   std::unique_ptr<ui::InputMethod> input_method_;
   std::unique_ptr<CocoaMouseCapture> mouse_capture_;
+  std::unique_ptr<CocoaWindowMoveLoop> window_move_loop_;
   std::unique_ptr<TooltipManager> tooltip_manager_;
   FocusManager* focus_manager_;  // Weak. Owned by our Widget.
   Widget::InitParams::Type widget_type_;
 
   BridgedNativeWidgetOwner* parent_;  // Weak. If non-null, owns this.
   std::vector<BridgedNativeWidget*> child_windows_;
 
   base::scoped_nsobject<NSView> compositor_superview_;
   std::unique_ptr<ui::AcceleratedWidgetMac> compositor_widget_;
   std::unique_ptr<ui::Compositor> compositor_;
@@ skipping 24 matching lines @@
   bool invalidate_shadow_on_frame_swap_ = false;
 
   AssociatedViews associated_views_;
 
   DISALLOW_COPY_AND_ASSIGN(BridgedNativeWidget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_