Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel_titlebar_view_cocoa.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/panels/panel_titlebar_view_cocoa.h"
 
 #include <Carbon/Carbon.h>  // kVK_Escape
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
@@ skipping 418 matching lines @@
                                            inMode:NSDefaultRunLoopMode
                                           dequeue:YES];
 
     switch ([event type]) {
       case NSLeftMouseDragged:
         if (dragState_ == PANEL_DRAG_CAN_START) {
           if (![self exceedsDragThreshold:[event locationInWindow]])
             return;  // Don't start real drag yet.
           [self startDrag];
         }
-        [self dragWithDeltaX:[event deltaX]];
+        [self dragWithDeltaX:[event deltaX]
+                      deltaY:[event deltaY]];
         break;
 
       case NSKeyUp:
         if ([event keyCode] == kVK_Escape) {
           [self endDrag:YES];
           keepGoing = NO;
         }
         break;
 
       case NSLeftMouseUp:
@@ skipping 22 matching lines @@
   dragState_ = PANEL_DRAG_IN_PROGRESS;
   [controller_ startDrag];
 }
 
 - (void)endDrag:(BOOL)cancelled {
   if (dragState_ == PANEL_DRAG_IN_PROGRESS)
     [controller_ endDrag:cancelled];
   dragState_ = PANEL_DRAG_SUPPRESSED;
 }
 
-- (void)dragWithDeltaX:(int)deltaX {
+- (void)dragWithDeltaX:(int)deltaX
+                deltaY:(int)deltaY {
   if (dragState_ != PANEL_DRAG_IN_PROGRESS)
     return;
-  [controller_ dragWithDeltaX:deltaX];
+  [controller_ dragWithDeltaX:deltaX
+                       deltaY:deltaY];
 }
 
 - (void)drawAttention {
   if (isDrawingAttention_)
     return;
   isDrawingAttention_ = YES;
 
   [self startGlintAnimation];
 }
 
@@ skipping 77 matching lines @@
 
 - (void)releaseLeftMouseButtonTitlebar {
   NSEvent* event = MakeMouseEvent(NSLeftMouseUp, NSZeroPoint, 1);
   [self mouseUp:event];
 }
 
 - (void)dragTitlebarDeltaX:(double)delta_x
                     deltaY:(double)delta_y {
   if (dragState_ == PANEL_DRAG_CAN_START)
     [self startDrag];
-  [self dragWithDeltaX:delta_x];
+  [self dragWithDeltaX:delta_x
+                deltaY:delta_y];
 }
 
 - (void)cancelDragTitlebar {
   [self endDrag:YES];
 }
 
 - (void)finishDragTitlebar {
   [self endDrag:NO];
 }
 
 - (void)updateSettingsButtonVisibility:(BOOL)mouseOverWindow {
   // The settings button is visible if the panel is main window or the mouse is
   // over it.
   BOOL shouldShowSettingsButton =
       mouseOverWindow || [[self window] isMainWindow];
   [[settingsButtonWrapper_ animator]
       setAlphaValue:shouldShowSettingsButton ? 1.0 : 0.0];
 }
 
 - (void)checkMouseAndUpdateSettingsButtonVisibility {
   BOOL mouseOverWindow = NSPointInRect([NSEvent mouseLocation],
                                        [[self window] frame]);
   [self updateSettingsButtonVisibility:mouseOverWindow];
 }
 
 @end