Look Up on Force Touch

ui/base/cocoa/base_view.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.
 
 #include "ui/base/cocoa/base_view.h"
 
 #include "base/mac/mac_util.h"
 
 NSString* kViewDidBecomeFirstResponder =
     @"Chromium.kViewDidBecomeFirstResponder";
@@ skipping 60 matching lines @@
   // This method left intentionally blank.
 }
 
 - (EventHandled)keyEvent:(NSEvent*)theEvent {
   // The default implementation of this method does not handle any key events.
   // Derived classes should return kEventHandled if they handled an event,
   // otherwise it will be forwarded on to |super|.
   return kEventNotHandled;
 }
 
+- (void)forceTouchEvent:(NSEvent*)theEvent {
+  // This method left intentionally blank.
+}
+
 - (void)mouseDown:(NSEvent*)theEvent {
   dragging_ = YES;
   [self mouseEvent:theEvent];
 }
 
 - (void)rightMouseDown:(NSEvent*)theEvent {
   [self mouseEvent:theEvent];
 }
 
 - (void)otherMouseDown:(NSEvent*)theEvent {
@@ skipping 68 matching lines @@
 - (void)keyDown:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
     [super keyDown:theEvent];
 }
 
 - (void)keyUp:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
     [super keyUp:theEvent];
 }
 
+- (void)pressureChangeWithEvent:(NSEvent*)theEvent {
+  NSInteger newStage = [theEvent stage];
+  if (pressureEventStage_ == newStage)
+    return;
+
+  // Call the force touch event when the stages reaches
+  // 2, which is the value for force touch

[Robert Sesek, 2015/12/21 22:30:21]

nit: punctuation.

[spqchan, 2016/01/06 22:52:31]

Done.

+  if (newStage == 2) {
+    [self forceTouchEvent:theEvent];
+  }
+  pressureEventStage_ = newStage;
+}
+
 - (void)flagsChanged:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
     [super flagsChanged:theEvent];
 }
 
 - (gfx::Rect)flipNSRectToRect:(NSRect)rect {
   gfx::Rect new_rect(NSRectToCGRect(rect));
   new_rect.set_y(NSHeight([self bounds]) - new_rect.bottom());
   return new_rect;
 }
 
 - (NSRect)flipRectToNSRect:(gfx::Rect)rect {
   NSRect new_rect(NSRectFromCGRect(rect.ToCGRect()));
   new_rect.origin.y = NSHeight([self bounds]) - NSMaxY(new_rect);
   return new_rect;
 }
 
 @end