Mac: Honour the user preference for triggering QuickLook with Force Click

ui/base/cocoa/appkit_utils.mm

 // Copyright 2013 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/base/cocoa/appkit_utils.h"
 
 #include "base/mac/mac_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace {
 
-// Gets an NSImage given an image id.
-NSImage* GetImage(int image_id) {
-  return ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(image_id)
-      .ToNSImage();
-}
-
 // Double-click in window title bar actions.
 enum class DoubleClickAction {
   NONE,
   MINIMIZE,
   MAXIMIZE,
 };
 
+// Values of com.apple.trackpad.forceClick corresponding to "Look up & data
+// detectors" in System Preferences -> Trackpad -> Point & Click.
+enum class ForceTouchAction {
+  NONE = 0,        // Unchecked or set to "Tap with three fingers".
+  QUICK_LOOK = 1,  // Set to "Force Click with one finger".
+};
+
+// Gets an NSImage given an image id.
+NSImage* GetImage(int image_id) {
+  return ui::ResourceBundle::GetSharedInstance()
+      .GetNativeImageNamed(image_id)
+      .ToNSImage();
+}
+
 // The action to take when the user double-clicks in the window title bar.
 DoubleClickAction WindowTitleBarDoubleClickAction() {
   // El Capitan introduced a Dock preference to configure the window title bar
   // double-click action (Minimize, Maximize, or nothing).
   if (base::mac::IsOSElCapitanOrLater()) {
     NSString* doubleClickAction = [[NSUserDefaults standardUserDefaults]
                                       objectForKey:@"AppleActionOnDoubleClick"];
 
     if ([doubleClickAction isEqualToString:@"Minimize"]) {
       return DoubleClickAction::MINIMIZE;
@@ skipping 53 matching lines @@
 
     case DoubleClickAction::MAXIMIZE:
       [window performZoom:sender];
       break;
 
     case DoubleClickAction::NONE:
       break;
   }
 }
 
+bool ForceClickInvokesQuickLook() {
+  return [[NSUserDefaults standardUserDefaults]
+             integerForKey:@"com.apple.trackpad.forceClick"] ==
+         static_cast<NSInteger>(ForceTouchAction::QUICK_LOOK);
+}
+
 }  // namespace ui