MacViews: Implemented Drag & Drop

ui/views/cocoa/bridged_native_widget.mm

 // Copyright 2014 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/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/thread_task_runner_handle.h"
 #include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #import "ui/base/cocoa/constrained_window/constrained_window_animation.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/dip_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #import "ui/gfx/mac/nswindow_frame_controls.h"
 #import "ui/views/cocoa/bridged_content_view.h"
+#import "ui/views/cocoa/drag_drop_client_mac.h"
 #import "ui/views/cocoa/cocoa_mouse_capture.h"
 #include "ui/views/cocoa/tooltip_manager_mac.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #import "ui/views/cocoa/widget_owner_nswindow_adapter.h"
 #include "ui/views/view.h"
 #include "ui/views/views_delegate.h"
 #include "ui/views/widget/native_widget_mac.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_aura_utils.h"
 #include "ui/views/widget/widget_delegate.h"
@@ skipping 419 matching lines @@
   }
 
   // Widgets for UI controls (usually layered above web contents) start visible.
   if (params.type == Widget::InitParams::TYPE_CONTROL)
     SetVisibilityState(SHOW_INACTIVE);
 
   // Tooltip Widgets shouldn't have their own tooltip manager, but tooltips are
   // native on Mac, so nothing should ever want one in Widget form.
   DCHECK_NE(params.type, Widget::InitParams::TYPE_TOOLTIP);
   tooltip_manager_.reset(new TooltipManagerMac(this));
+  drag_drop_client_.reset(new DragDropClientMac(this));
 }
 
 void BridgedNativeWidget::SetFocusManager(FocusManager* focus_manager) {
   if (focus_manager_ == focus_manager)
     return;
 
   if (focus_manager_)
     focus_manager_->RemoveFocusChangeListener(this);
 
   if (focus_manager)
@@ skipping 44 matching lines @@
   DCHECK(!view || !compositor_widget_);
 
   [bridged_view_ clearView];
   bridged_view_.reset();
   // Note that there can still be references to the old |bridged_view_|
   // floating around in Cocoa libraries at this point. However, references to
   // the old views::View will be gone, so any method calls will become no-ops.
 
   if (view) {
     bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
+    drag_drop_client_->SetRootView(view);
+
     // Objective C initializers can return nil. However, if |view| is non-NULL
     // this should be treated as an error and caught early.
     CHECK(bridged_view_);
   }
   [window_ setContentView:bridged_view_];
 }
 
 void BridgedNativeWidget::SetVisibilityState(WindowVisibilityState new_state) {
   // Ensure that:
   //  - A window with an invisible parent is not made visible.
@@ skipping 763 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views