MacViews: Implement capture using NSEvent local+global monitors

ui/views/cocoa/bridged_content_view.mm

 // 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.
 
 #import "ui/views/cocoa/bridged_content_view.h"
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/gfx/canvas_paint_mac.h"
+#import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 @interface BridgedContentView ()
 
 // Translates the location of |theEvent| to toolkit-views coordinates and passes
 // the event to NativeWidgetMac for handling.
 - (void)handleMouseEvent:(NSEvent*)theEvent;
@@ skipping 30 matching lines @@
   }
   return self;
 }
 
 - (void)clearView {
   hostedView_ = NULL;
   [trackingArea_.get() clearOwner];
   [self removeTrackingArea:trackingArea_.get()];
 }
 
+- (void)processCapturedMouseEvent:(NSEvent*)theEvent {
+  if (!hostedView_)
+    return;
+
+  NSWindow* source = [theEvent window];
+  NSWindow* target = [self window];
+  DCHECK(target);
+
+  // If there's no window, or it's the view's window, process normally.
+  if (!source || [target isEqual:source]) {
+    [self handleMouseEvent:theEvent];
+    return;
+  }
+
+  // Otherwise, the coordinates will be based in another window's. Modifying
+  // NSEvents is hard, so convert by translating by the relative locations of
+  // *top* left of the *content* area of each window, in screen coordinates.
+  NSRect sourceRect = [source contentRectForFrameRect:[source frame]];
+  NSRect targetRect = [target contentRectForFrameRect:[target frame]];
+  gfx::Vector2d offset(NSMinX(sourceRect) - NSMinX(targetRect),
+                       NSMaxY(targetRect) - NSMaxY(sourceRect));
+
+  ui::MouseEvent event(theEvent);
+  event.set_location(event.location() + offset);
+  hostedView_->GetWidget()->OnMouseEvent(&event);
+}
+
 // BridgedContentView private implementation.
 
 - (void)handleMouseEvent:(NSEvent*)theEvent {
   if (!hostedView_)
     return;
 
   ui::MouseEvent event(theEvent);
   hostedView_->GetWidget()->OnMouseEvent(&event);
 }
 
@@ skipping 249 matching lines @@
   }
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
   return [hostedView_->GetNativeViewAccessible() accessibilityHitTest:point];
 }
 
 @end