[MacViews] Enable dragging a window by its caption/draggable areas.

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 <vector>
 
@@ skipping 11 matching lines @@
 @class BridgedContentView;
 @class ViewsNSWindowDelegate;
 
 namespace ui {
 class InputMethod;
 }
 
 namespace views {
 
 class CocoaMouseCapture;
+class CocoaNonClientDrag;
 class InputMethod;
 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 internal::InputMethodDelegate,
@@ skipping 83 matching lines @@
   // 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.
   void OnBackingPropertiesChanged();
 
   // Called by the NSWindowDelegate when the window becomes or resigns key.
   void OnWindowKeyStatusChangedTo(bool is_key);
 
+  // Called when the application receives a mouse-down, but before the event
+  // is processed by NSWindows. Returning true here will cause the event to be
+  // reposted.

[tapted, 2015/05/20 07:18:15]

Perhaps say why this exists here.

[jackhou1, 2015/05/22 02:49:16]

Done.

+  bool OnWindowWillReceiveLeftMouseDown(NSPoint location_in_window);

[tapted, 2015/05/20 07:18:15]

perhaps ShouldRepostPendingLeftMouseDown ?

[jackhou1, 2015/05/22 02:49:16]

Done.

+
   // Called by NativeWidgetMac when the window size constraints change.
   void OnSizeConstraintsChanged();
 
   // See widget.h for documentation.
   InputMethod* CreateInputMethod();
   ui::InputMethod* GetHostInputMethod();
 
   // The restored bounds will be derived from the current NSWindow frame unless
   // fullscreen or transitioning between fullscreen states.
   gfx::Rect GetRestoredBounds() const;
@@ skipping 76 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_;
   scoped_ptr<ui::InputMethod> input_method_;
   scoped_ptr<CocoaMouseCapture> mouse_capture_;
+  scoped_ptr<CocoaNonClientDrag> non_client_drag_;
   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_;
   scoped_ptr<ui::AcceleratedWidgetMac> compositor_widget_;
   scoped_ptr<ui::Compositor> compositor_;
 
@@ skipping 17 matching lines @@
   // If true, the window is either visible, or wants to be visible but is
   // currently hidden due to having a hidden parent.
   bool wants_to_be_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(BridgedNativeWidget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_