Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/cocoa/panels/mouse_drag_controller.mm

-// Copyright (c) 2012 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 "chrome/browser/ui/cocoa/panels/mouse_drag_controller.h"
-
-#include <Carbon/Carbon.h>  // kVK_Escape
-#import <Cocoa/Cocoa.h>
-
-#include "base/logging.h"
-#include "base/mac/scoped_nsautorelease_pool.h"
-
-// The distance the user has to move the mouse while keeping the left button
-// down before panel resizing operation actually starts.
-const double kDragThreshold = 3.0;
-
-@implementation MouseDragController
-
-- (NSView<MouseDragControllerClient>*)client {
-  return client_;
-}
-
-- (NSPoint)initialMouseLocation {
-  return initialMouseLocation_;
-}
-
-- (BOOL)exceedsDragThreshold:(NSPoint)mouseLocation {
-  float deltaX = fabs(initialMouseLocation_.x - mouseLocation.x);
-  float deltaY = fabs(initialMouseLocation_.y - mouseLocation.y);
-  return deltaX > kDragThreshold || deltaY > kDragThreshold;
-}
-
-- (BOOL)tryStartDrag:(NSEvent*)event {
-  DCHECK(dragState_ == PANEL_DRAG_CAN_START);
-  NSPoint mouseLocation = [event locationInWindow];
-  if (![self exceedsDragThreshold:mouseLocation])
-    return NO;
-
-  // Mouse moved over threshold, start drag.
-  dragState_ = PANEL_DRAG_IN_PROGRESS;
-  [client_ dragStarted:initialMouseLocation_];
-  return YES;
-}
-
-- (void)cleanupAfterDrag {
-  if (dragState_ == PANEL_DRAG_SUPPRESSED)
-    return;
-  dragState_ = PANEL_DRAG_SUPPRESSED;
-  initialMouseLocation_ = NSZeroPoint;
-  [client_ cleanupAfterDrag];
-}
-
-- (MouseDragController*)initWithClient:
-      (NSView<MouseDragControllerClient>*)client {
-  client_ = client;
-  dragState_ = PANEL_DRAG_SUPPRESSED;
-  return self;
-}
-
-- (void)mouseDown:(NSEvent*)event {
-  DCHECK(dragState_ == PANEL_DRAG_SUPPRESSED);
-  dragState_ = PANEL_DRAG_CAN_START;
-  initialMouseLocation_ = [event locationInWindow];
-  [client_ prepareForDrag];
-}
-
-- (void)mouseDragged:(NSEvent*)event {
-  if (dragState_ == PANEL_DRAG_SUPPRESSED)
-    return;
-
-  // In addition to events needed to control the drag operation, fetch the right
-  // mouse click events and key down events and ignore them, to prevent their
-  // accumulation in the queue and "playing out" when the mouse is released.
-  const NSUInteger mask =
-      NSLeftMouseUpMask | NSLeftMouseDraggedMask | NSKeyUpMask |
-      NSRightMouseDownMask | NSKeyDownMask ;
-
-  while (true) {
-    base::mac::ScopedNSAutoreleasePool autorelease_pool;
-    BOOL keepGoing = YES;
-
-    switch ([event type]) {
-      case NSLeftMouseDragged: {
-        // If drag didn't start yet, see if mouse moved far enough to start it.
-        if (dragState_ == PANEL_DRAG_CAN_START && ![self tryStartDrag:event])
-          return;
-
-        DCHECK(dragState_ == PANEL_DRAG_IN_PROGRESS);
-        [client_ dragProgress:[event locationInWindow]];
-        break;
-      }
-
-      case NSKeyUp:
-        if ([event keyCode] == kVK_Escape) {
-          // The drag might not be started yet because of threshold, so check.
-          if (dragState_ == PANEL_DRAG_IN_PROGRESS)
-            [client_ dragEnded:YES];
-          keepGoing = NO;
-        }
-        break;
-
-      case NSLeftMouseUp:
-        // The drag might not be started yet because of threshold, so check.
-        if (dragState_ == PANEL_DRAG_IN_PROGRESS)
-          [client_ dragEnded:NO];
-        keepGoing = NO;
-        break;
-
-      case NSRightMouseDownMask:
-        break;
-
-      default:
-        // Dequeue and ignore other mouse and key events so the Chrome context
-        // menu does not come after right click on a page during Panel
-        // resize, or the keystrokes are not 'accumulated' and entered
-        // at once when the drag ends.
-        break;
-    }
-
-    if (!keepGoing)
-      break;
-
-    autorelease_pool.Recycle();
-
-    event = [NSApp nextEventMatchingMask:mask
-                               untilDate:[NSDate distantFuture]
-                                  inMode:NSDefaultRunLoopMode
-                                 dequeue:YES];
-
-  }
-  [self cleanupAfterDrag];
-}
-
-
-- (void)mouseUp:(NSEvent*)event {
-  if (dragState_ == PANEL_DRAG_SUPPRESSED)
-    return;
-  // The mouseUp while in drag should be processed by nested message loop
-  // in mouseDragged: method.
-  DCHECK(dragState_ != PANEL_DRAG_IN_PROGRESS);
-  // Do cleanup in case the actual drag was not started (because of threshold).
-  [self cleanupAfterDrag];
-}
-@end
-