mus: Use the new drag API to implement tab dragging in chrome.

ash/mus/window_manager.cc

 // Copyright 2015 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 "ash/mus/window_manager.h"
 
 #include <stdint.h>
 
 #include <utility>
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/mus/bridge/wm_lookup_mus.h"
 #include "ash/mus/bridge/wm_shell_mus.h"
 #include "ash/mus/bridge/wm_window_mus.h"
+#include "ash/mus/frame/move_event_handler.h"
 #include "ash/mus/non_client_frame_controller.h"
 #include "ash/mus/property_util.h"
 #include "ash/mus/root_window_controller.h"
 #include "ash/mus/root_windows_observer.h"
 #include "ash/mus/shadow_controller.h"
 #include "ash/mus/window_manager_application.h"
 #include "ash/public/interfaces/container.mojom.h"
 #include "components/mus/common/event_matcher_util.h"
 #include "components/mus/common/types.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_property.h"
 #include "components/mus/public/cpp/window_tree_client.h"
 #include "components/mus/public/interfaces/mus_constants.mojom.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
+#include "ui/base/hit_test.h"
 #include "ui/events/mojo/event.mojom.h"
 #include "ui/views/mus/screen_mus.h"
 
 namespace ash {
 namespace mus {
 
 const uint32_t kWindowSwitchAccelerator = 1;
 
 void AssertTrue(bool success) {
   DCHECK(success);
@@ skipping 182 matching lines @@
     bool janky) {
   for (auto window : client_windows)
     SetWindowIsJanky(window, janky);
 }
 
 void WindowManager::OnWmNewDisplay(::mus::Window* window,
                                    const display::Display& display) {
   CreateRootWindowController(window, display);
 }
 
+void WindowManager::OnWmPerformMoveLoop(uint32_t change_id,
+                                        uint32_t window_id,
+                                        const gfx::Point& cursor_location) {
+  WmWindowMus* child_window =
+      WmWindowMus::Get(window_tree_client_->GetWindowByServerId(window_id));
+  MoveEventHandler* handler = MoveEventHandler::GetForWindow(child_window);
+  handler->AttemptToStartDrag(cursor_location, HTCAPTION,
+                              base::Bind(&WindowManager::OnWmMoveLoopCompleted,
+                                         base::Unretained(this), change_id));
+}
+
+void WindowManager::OnWmCancelMoveLoop(uint32_t window_id) {
+  WmWindowMus* child_window =
+      WmWindowMus::Get(window_tree_client_->GetWindowByServerId(window_id));
+  MoveEventHandler* handler = MoveEventHandler::GetForWindow(child_window);
+  handler->RevertDrag();
+}
+
+void WindowManager::OnWmMoveLoopCompleted(uint32_t change_id, bool succeeded) {
+  window_manager_client_->OnWmMoveLoopCompleted(change_id, succeeded);
+}
+
 void WindowManager::OnAccelerator(uint32_t id, const ui::Event& event) {
   switch (id) {
     case kWindowSwitchAccelerator:
       window_manager_client()->ActivateNextWindow();
       break;
     default:
       window_manager_app_->OnAccelerator(id, event);
       break;
   }
 }
 
-void WindowManager::OnWmPerformMoveLoop(uint32_t change_id,
-                                        uint32_t window_id,
-                                        const gfx::Point& cursor_location) {
-  NOTIMPLEMENTED();
-}
-
-void WindowManager::OnWmCancelMoveLoop(uint32_t window_id) {
-  NOTIMPLEMENTED();
-}
-
 }  // namespace mus
 }  // namespace ash