cef/libcef/browser/menu_creator_runner_mac.mm

// Copyright (c) 2012 The Chromium Embedded Framework 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 "libcef/browser/menu_creator_runner_mac.h"
#include "libcef/browser/browser_host_impl.h"

#include "base/message_loop/message_loop.h"
#include "base/compiler_specific.h"
#import "base/mac/scoped_sending_event.h"
#import "ui/base/cocoa/menu_controller.h"

CefMenuCreatorRunnerMac::CefMenuCreatorRunnerMac()
    : menu_controller_(nil) {
}

CefMenuCreatorRunnerMac::~CefMenuCreatorRunnerMac() {
  if (menu_controller_ != nil)
    [menu_controller_ release];
}

bool CefMenuCreatorRunnerMac::RunContextMenu(CefMenuCreator* manager) {
  // Create a menu controller based on the model.
  if (menu_controller_ != nil)
    [menu_controller_ release];
  menu_controller_ =
      [[MenuController alloc] initWithModel:manager->model()
                     useWithPopUpButtonCell:NO];

  NSView* parent_view =
      manager->browser()->GetWebContents()->GetContentNativeView();

  // Synthesize an event for the click, as there is no certainty that
  // [NSApp currentEvent] will return a valid event.
  NSEvent* currentEvent = [NSApp currentEvent];
  NSWindow* window = [parent_view window];

  NSPoint position = [window mouseLocationOutsideOfEventStream];

  NSTimeInterval eventTime = [currentEvent timestamp];
  NSEvent* clickEvent = [NSEvent mouseEventWithType:NSRightMouseDown
                                           location:position
                                      modifierFlags:NSRightMouseDownMask
                                          timestamp:eventTime
                                       windowNumber:[window windowNumber]
                                            context:nil
                                        eventNumber:0
                                         clickCount:1
                                           pressure:1.0];

  {
    // Make sure events can be pumped while the menu is up.
    base::MessageLoop::ScopedNestableTaskAllower allow(
        base::MessageLoop::current());

    // One of the events that could be pumped is |window.close()|.
    // User-initiated event-tracking loops protect against this by
    // setting flags in -[CrApplication sendEvent:], but since
    // web-content menus are initiated by IPC message the setup has to
    // be done manually.
    base::mac::ScopedSendingEvent sendingEventScoper;

    // Show the menu. Blocks until the menu is dismissed.
    if (manager->browser()->IsWindowless()) {
      // Showing the menu in OSR is pretty much self contained, only using
      // the initialized menu_controller_ in this function, and the scoped
      // variables in this block.
      int screenX = 0, screenY = 0;
      CefRefPtr<CefRenderHandler> handler =
          manager->browser()->GetClient()->GetRenderHandler();
      if (!handler->GetScreenPoint(manager->browser(),
                                   manager->params().x, manager->params().y,
                                   screenX, screenY)) {
        return false;
      }

      // Don't show the menu unless there is a parent native window to tie it to
      if (!manager->browser()->GetWindowHandle())
        return false;

      NSPoint screen_position =
          NSPointFromCGPoint(gfx::Point(screenX, screenY).ToCGPoint());
      [[menu_controller_ menu] popUpMenuPositioningItem:nil
                                             atLocation:screen_position
                                                 inView:nil];
    } else {
      [NSMenu popUpContextMenu:[menu_controller_ menu]
                     withEvent:clickEvent
                       forView:parent_view];
    }
  }

  return true;
}