Kill popups when scrolling.

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "base/histogram.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/browser_trial.h"
 #import "chrome/browser/cocoa/rwhvm_editcommand_helper.h"
@@ skipping 416 matching lines @@
 - (void)keyEvent:(NSEvent *)theEvent {
   // TODO(avi): Possibly kill self? See RenderWidgetHostViewWin::OnKeyEvent and
   // http://b/issue?id=1192881 .
 
   NativeWebKeyboardEvent event(theEvent);
   if (renderWidgetHostView_->render_widget_host_)
     renderWidgetHostView_->render_widget_host_->ForwardKeyboardEvent(event);
 }
 
 - (void)scrollWheel:(NSEvent *)theEvent {
+  // On Windows, popups are implemented with a popup window style, so that when
+  // an event comes in that would "cancel" it, it receives the OnCancelMode
+  // message and can kill itself. Alas, on the Mac, views cannot capture events
+  // outside of themselves.  While a click outside a popup kills it, that's just
+  // a defocusing of the text field in WebCore and our editor client kills the
+  // popup. But a scroll wheel event outside a popup must kill it.
+  //
+  // Thus this lovely case of filicide. If this view can be the key view, it is
+  // not a popup. Therefore, if it has any children, they are popups that need
+  // to be canceled.
+  if (canBeKeyView_) {
+    for (NSView* subview in [self subviews]) {
+      ((RenderWidgetHostViewCocoa*)subview)->renderWidgetHostView_->KillSelf();
+    }
+  }
+
   const WebMouseWheelEvent& event =
       WebInputEventFactory::mouseWheelEvent(theEvent, self);
   if (renderWidgetHostView_->render_widget_host_)
     renderWidgetHostView_->render_widget_host_->ForwardWheelEvent(event);
 }
 
 - (void)setFrame:(NSRect)frameRect {
   [super setFrame:frameRect];
   if (renderWidgetHostView_->render_widget_host_)
     renderWidgetHostView_->render_widget_host_->WasResized();
@@ skipping 323 matching lines @@
 // NSView calls this to get the text when displaying the tooltip.
 - (NSString *)view:(NSView *)view
   stringForToolTip:(NSToolTipTag)tag
              point:(NSPoint)point
           userData:(void *)data {
   return [[toolTip_ copy] autorelease];
 }
 
 @end