mac: Only let two-finger-scrolling trigger history if web doesn't swallow gesture

chrome/browser/ui/cocoa/browser_window_controller.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/ui/cocoa/browser_window_controller.h"
 
 #include <Carbon/Carbon.h>
 
 #include <cmath>
 #include <numeric>
@@ skipping 25 matching lines @@
 #import "chrome/browser/ui/cocoa/browser_window_cocoa.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 #import "chrome/browser/ui/cocoa/dev_tools_controller.h"
 #import "chrome/browser/ui/cocoa/download/download_shelf_controller.h"
 #import "chrome/browser/ui/cocoa/event_utils.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
 #import "chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h"
 #import "chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.h"
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
 #import "chrome/browser/ui/cocoa/fullscreen_window.h"
-#import "chrome/browser/ui/cocoa/gesture_utils.h"
 #import "chrome/browser/ui/cocoa/image_utils.h"
 #import "chrome/browser/ui/cocoa/infobars/infobar_container_controller.h"
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h"
 #import "chrome/browser/ui/cocoa/presentation_mode_controller.h"
 #import "chrome/browser/ui/cocoa/sidebar_controller.h"
 #import "chrome/browser/ui/cocoa/status_bubble_mac.h"
 #import "chrome/browser/ui/cocoa/tab_contents/previewable_contents_controller.h"
 #import "chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h"
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 #import "chrome/browser/ui/cocoa/tabpose_window.h"
@@ skipping 93 matching lines @@
 @interface NSWindow (NSPrivateApis)
 // Note: These functions are private, use -[NSObject respondsToSelector:]
 // before calling them.
 
 - (void)setBottomCornerRounded:(BOOL)rounded;
 
 - (NSRect)_growBoxRect;
 
 @end
 
-// Forward-declare symbols that are part of the 10.6 SDK.
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-
-enum {
-    NSTouchPhaseBegan           = 1U << 0,
-    NSTouchPhaseMoved           = 1U << 1,
-    NSTouchPhaseStationary      = 1U << 2,
-    NSTouchPhaseEnded           = 1U << 3,
-    NSTouchPhaseCancelled       = 1U << 4,
-    NSTouchPhaseTouching        = NSTouchPhaseBegan | NSTouchPhaseMoved |
-                                  NSTouchPhaseStationary,
-    NSTouchPhaseAny             = NSUIntegerMax
-};
-typedef NSUInteger NSTouchPhase;
-
-@interface NSEvent (SnowLeopardDeclarations)
-- (NSSet*)touchesMatchingPhase:(NSTouchPhase)phase inView:(NSView*)view;
-@end
-
-@interface NSTouch : NSObject
-- (NSPoint)normalizedPosition;
-- (id<NSObject, NSCopying>)identity;
-@end
-
-#endif  // MAC_OS_X_VERSION_10_6
-
 // Provide the forward-declarations of new 10.7 SDK symbols so they can be
 // called when building with the 10.5 SDK.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
 
 enum {
   NSWindowAnimationBehaviorDefault = 0,
   NSWindowAnimationBehaviorNone = 2,
   NSWindowAnimationBehaviorDocumentWindow = 3,
   NSWindowAnimationBehaviorUtilityWindow = 4,
@@ skipping 1580 matching lines @@
     command = IDC_ZOOM_MINUS;
   }
 
   if (command && browser_->command_updater()->IsCommandEnabled(command)) {
     currentZoomStepDelta_ += (command == IDC_ZOOM_PLUS) ? 1 : -1;
     browser_->ExecuteCommandWithDisposition(command,
         event_utils::WindowOpenDispositionFromNSEvent(event));
   }
 }
 
-// Documented in 10.6+, but present starting in 10.5. Called at the beginning
-// of a gesture.
-- (void)beginGestureWithEvent:(NSEvent*)event {
-  totalMagnifyGestureAmount_ = 0;
-  currentZoomStepDelta_ = 0;
-
-  // On Lion, there's support controlled by a System Preference for two- and
-  // three-finger navigational gestures. If set to allow three-finger gestures,
-  // the system gesture recognizer will automatically call |-swipeWithEvent:|
-  // and that will be handled as it would be on Snow Leopard. The two-finger
-  // gesture does not do this, so it must be manually recognized. See the note
-  // inside RecognizeTwoFingerGestures() for detailed information on the
-  // interaction of the different preferences.
-  if (!gesture_utils::RecognizeTwoFingerGestures())
-    return;
-  NSSet* touches = [event touchesMatchingPhase:NSTouchPhaseAny
-                                        inView:nil];
-  if ([touches count] >= 2) {
-    twoFingerGestureTouches_.reset([[NSMutableDictionary alloc] init]);
-    for (NSTouch* touch in touches) {
-      [twoFingerGestureTouches_ setObject:touch forKey:touch.identity];
-    }
-  }
-}
-
-- (void)endGestureWithEvent:(NSEvent*)event {
-  // This method only needs to process gesture events for two-finger navigation.
-  if (!twoFingerGestureTouches_.get())
-    return;
-
-  // When a multi-touch gesture ends, only one touch will be in the "End" phase.
-  // Other touches will be in "Moved" or "Unknown" phases. So long as one is
-  // ended, which it is by virtue of this method being called, the gesture can
-  // be committed so long as the magnitude is great enough.
-  NSSet* touches = [event touchesMatchingPhase:NSTouchPhaseAny
-                                        inView:nil];
-
-  // Store the touch data locally and reset the ivar so that new gestures can
-  // begin.
-  scoped_nsobject<NSDictionary> beginTouches(
-      twoFingerGestureTouches_.release());
-
-  // Construct a vector of magnitudes. Since gesture events do not have the
-  // |-deltaX| property set, this creates the X/Y magnitudes for each finger.
-  std::vector<CGFloat> deltasX;
-  std::vector<CGFloat> deltasY;
-  for (NSTouch* touch in touches) {
-    NSTouch* beginTouch = [beginTouches objectForKey:touch.identity];
-    if (!beginTouch)
-      continue;
-
-    // The |normalizedPosition| is scaled from (0, 1).
-    NSPoint beginPoint = beginTouch.normalizedPosition;
-    NSPoint endPoint = touch.normalizedPosition;
-
-    deltasX.push_back(endPoint.x - beginPoint.x);
-    deltasY.push_back(endPoint.y - beginPoint.y);
-  }
-
-  // Need at least two points to gesture.
-  if (deltasX.size() < 2)
-    return;
-
-  CGFloat sumX = std::accumulate(deltasX.begin(), deltasX.end(), 0.0f);
-  CGFloat sumY = std::accumulate(deltasY.begin(), deltasY.end(), 0.0f);
-
-  // If the Y magnitude is greater than the X, then don't treat this as a
-  // gesture. It was likely a vertical scroll instead.
-  if (std::abs(sumY) > std::abs(sumX))
-    return;
-
-  // On Lion, the user can choose to use a "natural" scroll direction with
-  // inverted axes.
-  if (gesture_utils::IsScrollDirectionInverted())
-    sumX *= -1;
-
-  int command_id = 0;
-  if (sumX > 0.3)
-    command_id = IDC_FORWARD;
-  else if (sumX < -0.3)
-    command_id = IDC_BACK;
-  else
-    return;
-
-  if (browser_->command_updater()->IsCommandEnabled(command_id)) {
-    browser_->ExecuteCommandWithDisposition(command_id,
-        event_utils::WindowOpenDispositionFromNSEvent(event));
-  }
-}
-
 // Delegate method called when window is resized.
 - (void)windowDidResize:(NSNotification*)notification {
   // Resize (and possibly move) the status bubble. Note that we may get called
   // when the status bubble does not exist.
   if (statusBubble_) {
     statusBubble_->UpdateSizeAndPosition();
   }
 
   // Let the selected RenderWidgetHostView know, so that it can tell plugins.
   if (TabContents* contents = browser_->GetSelectedTabContents()) {
@@ skipping 406 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)