MacViews: Implement capture using NSEvent local+global monitors

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>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/compositor/layer_owner.h"
 #import "ui/accelerated_widget_mac/accelerated_widget_mac.h"
+#import "ui/views/cocoa/cocoa_mouse_capture_delegate.h"
 #import "ui/views/focus/focus_manager.h"
 #include "ui/views/ime/input_method_delegate.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
 
 @class BridgedContentView;
 @class ViewsNSWindowDelegate;
 
 namespace ui {
 class InputMethod;
 }
 
 namespace views {
 
+class CocoaMouseCapture;
 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,
+                                         public CocoaMouseCaptureDelegate,
                                          public FocusChangeListener,
                                          public ui::AcceleratedWidgetMacNSView {
  public:
   // Ways of changing the visibility of the bridged NSWindow.
   enum WindowVisibilityState {
     HIDE_WINDOW,               // Hides with -[NSWindow orderOut:].
     SHOW_AND_ACTIVATE_WINDOW,  // Shows with -[NSWindow makeKeyAndOrderFront:].
     SHOW_INACTIVE,             // Shows with -[NSWindow orderWindow:..]. Orders
                                // the window above its parent if it has one.
   };
@@ skipping 14 matching lines @@
   void SetBounds(const gfx::Rect& new_bounds);
 
   // Set or clears the views::View bridged by the content view. This does NOT
   // take ownership of |view|.
   void SetRootView(views::View* view);
 
   // 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();
+
   // 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.
@@ skipping 68 matching lines @@
   void DestroyCompositor();
 
   // Installs the NSView for hosting the composited layer. It is later provided
   // to |compositor_widget_| via AcceleratedWidgetGetNSView().
   void AddCompositorSuperview();
 
   // Size the layer to match the client area bounds, taking into account display
   // scale factor.
   void UpdateLayerProperties();
 
+  // Overridden from CocoaMouseCaptureDelegate:
+  void PostCapturedEvent(NSEvent* event) override;
+  void OnMouseCaptureLost() override;
+
   // Overridden from FocusChangeListener:
   void OnWillChangeFocus(View* focused_before,
                          View* focused_now) override;
   void OnDidChangeFocus(View* focused_before,
                         View* focused_now) override;
 
   // Overridden from ui::LayerDelegate:
   void OnPaintLayer(gfx::Canvas* canvas) override;
   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override;
   void OnDeviceScaleFactorChanged(float device_scale_factor) override;
   base::Closure PrepareForLayerBoundsChange() override;
 
   // Overridden from ui::AcceleratedWidgetMac:
   NSView* AcceleratedWidgetGetNSView() const override;
   bool AcceleratedWidgetShouldIgnoreBackpressure() const override;
   void AcceleratedWidgetSwapCompleted(
       const std::vector<ui::LatencyInfo>& latency_info) override;
   void AcceleratedWidgetHitError() 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_;
   FocusManager* focus_manager_;  // Weak. Owned by our Widget.
 
   BridgedNativeWidget* 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_;
 
   // Tracks the bounds when the window last started entering fullscreen. Used to
@@ skipping 16 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_