[Mac] Confirm-to-Quit: Wait for a KeyUp event if the user held Cmd+Q on the second tap.

chrome/browser/app_controller_mac.mm

 // Copyright (c) 2011 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 "chrome/browser/app_controller_mac.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/mac/mac_util.h"
@@ skipping 267 matching lines @@
 - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)app {
   // Check if the experiment is enabled.
   const CommandLine* commandLine(CommandLine::ForCurrentProcess());
   if (commandLine->HasSwitch(switches::kDisableConfirmToQuit))
     return NSTerminateNow;
 
   // If the application is going to terminate as the result of a Cmd+Q
   // invocation, use the special sauce to prevent accidental quitting.
   // http://dev.chromium.org/developers/design-documents/confirm-to-quit-experiment
 
-  // How long the user must hold down Cmd+Q to confirm the quit.
-  const NSTimeInterval kTimeToConfirmQuit = 1.5;
-  // Leeway between the |targetDate| and the current time that will confirm a
-  // quit.
-  const NSTimeInterval kTimeDeltaFuzzFactor = 1.0;
-  // Duration of the window fade out animation.
-  const NSTimeInterval kWindowFadeAnimationDuration = 0.2;
-
   // This logic is only for keyboard-initiated quits.
-  NSEvent* currentEvent = [app currentEvent];
-  if ([currentEvent type] != NSKeyDown)
-    return NSTerminateNow;
-  ui::AcceleratorCocoa currentEventAccelerator([currentEvent characters],
-      [currentEvent modifierFlags] & NSDeviceIndependentModifierFlagsMask);
-  if ([ConfirmQuitPanelController quitAccelerator] != currentEventAccelerator)
+  if (![ConfirmQuitPanelController eventTriggersFeature:[app currentEvent]])
     return NSTerminateNow;
 
-  // If this is the second of two such attempts to quit within a certain time
-  // interval, then just quit.
-  // Time of last quit attempt, if any.
-  static NSDate* lastQuitAttempt;  // Initially nil, as it's static.
-  NSDate* timeNow = [NSDate date];
-  if (lastQuitAttempt &&
-      [timeNow timeIntervalSinceDate:lastQuitAttempt] < kTimeDeltaFuzzFactor) {
-    return NSTerminateNow;
-  } else {
-    [lastQuitAttempt release];  // Harmless if already nil.
-    lastQuitAttempt = [timeNow retain];  // Record this attempt for next time.
-  }
-
-  // Show the info panel that explains what the user must to do confirm quit.
-  [[ConfirmQuitPanelController sharedController] showWindow:self];
-
-  // Spin a nested run loop until the |targetDate| is reached or a KeyUp event
-  // is sent.
-  NSDate* targetDate =
-      [NSDate dateWithTimeIntervalSinceNow:kTimeToConfirmQuit];
-  BOOL willQuit = NO;
-  NSEvent* nextEvent = nil;
-  do {
-    // Dequeue events until a key up is received.
-    nextEvent = [app nextEventMatchingMask:NSKeyUpMask
-                                 untilDate:nil
-                                    inMode:NSEventTrackingRunLoopMode
-                                   dequeue:YES];
-
-    // Wait for the time expiry to happen. Once past the hold threshold,
-    // commit to quitting and hide all the open windows.
-    if (!willQuit) {
-      NSDate* now = [NSDate date];
-      NSTimeInterval difference = [targetDate timeIntervalSinceDate:now];
-      if (difference < kTimeDeltaFuzzFactor) {
-        willQuit = YES;
-
-        // At this point, the quit has been confirmed and windows should all
-        // fade out to convince the user to release the key combo to finalize
-        // the quit.
-        [NSAnimationContext beginGrouping];
-        [[NSAnimationContext currentContext] setDuration:
-            kWindowFadeAnimationDuration];
-        for (NSWindow* aWindow in [app windows]) {
-          // Windows that are set to animate and have a delegate do not
-          // expect to be animated by other things and could result in an
-          // invalid state. If a window is set up like so, just force the
-          // alpha value to 0. Otherwise, animate all pretty and stuff.
-          if (![[aWindow animationForKey:@"alphaValue"] delegate]) {
-            [[aWindow animator] setAlphaValue:0.0];
-          } else {
-            [aWindow setAlphaValue:0.0];
-          }
-        }
-        [NSAnimationContext endGrouping];
-      }
-    }
-  } while (!nextEvent);
-
-  // The user has released the key combo. Discard any events (i.e. the
-  // repeated KeyDown Cmd+Q).
-  [app discardEventsMatchingMask:NSAnyEventMask beforeEvent:nextEvent];
-
-  if (willQuit) {
-    // The user held down the combination long enough that quitting should
-    // happen.
-    return NSTerminateNow;
-  } else {
-    // Slowly fade the confirm window out in case the user doesn't
-    // understand what they have to do to quit.
-    [[ConfirmQuitPanelController sharedController] dismissPanel];
-    return NSTerminateCancel;
-  }
-
-  // Default case: terminate.
-  return NSTerminateNow;
+  return [[ConfirmQuitPanelController sharedController]
+      runModalLoopForApplication:app];
 }
 
 // Called when the app is shutting down. Clean-up as appropriate.
 - (void)applicationWillTerminate:(NSNotification*)aNotification {
   NSAppleEventManager* em = [NSAppleEventManager sharedAppleEventManager];
   [em removeEventHandlerForEventClass:kInternetEventClass
                            andEventID:kAEGetURL];
   [em removeEventHandlerForEventClass:'WWW!'
                            andEventID:'OURL'];
 
@@ skipping 899 matching lines @@
   [appController showPreferencesWindow:nil page:page profile:profile];
 }
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac