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"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
+namespace {
+
+// Convert a |point| in |source_window|'s AppKit coordinate system (origin at
+// the bottom left of the window) to |target_window|'s content rect, with the
+// origin at the top left of the content area.
+// If |source_window| is nil, |point| will be treated as screen coordinates.
+gfx::Point MovePointToWindow(const NSPoint& point,
+                             NSWindow* source_window,
+                             NSWindow* target_window) {
+  NSPoint point_in_screen = source_window
+      ? [source_window convertBaseToScreen:point]
+      : point;
+
+  NSPoint point_in_window = [target_window convertScreenToBase:point_in_screen];
+  NSRect content_rect =
+      [target_window contentRectForFrameRect:[target_window frame]];
+  return gfx::Point(point_in_window.x,
+                    NSHeight(content_rect) - point_in_window.y);
+}
+
+}
+
 @interface BridgedContentView ()
 
 // Translates the location of |theEvent| to toolkit-views coordinates and passes
 // the event to NativeWidgetMac for handling.
 - (void)handleMouseEvent:(NSEvent*)theEvent;
 
 // Execute a command on the currently focused TextInputClient.
 // |commandId| should be a resource ID from ui_strings.grd.
 - (void)doCommandByID:(int)commandId;
 
@@ skipping 25 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 it's the view's window, process normally.
+  if ([target isEqual:source]) {
+    [self handleMouseEvent:theEvent];
+    return;
+  }
+
+  ui::MouseEvent event(theEvent);
+  event.set_location(
+      MovePointToWindow([theEvent locationInWindow], source, target));
+  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