Prevents panels attached to shelf from docking

ash/wm/workspace/multi_window_resize_controller.cc

 // 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 "ash/wm/workspace/multi_window_resize_controller.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
@@ skipping 415 matching lines @@
   std::vector<aura::Window*> windows;
   windows.push_back(windows_.window2);
   DCHECK(windows_.other_windows.empty());
   FindWindowsTouching(windows_.window2, windows_.direction,
                       &windows_.other_windows);
   for (size_t i = 0; i < windows_.other_windows.size(); ++i) {
     windows_.other_windows[i]->AddObserver(this);
     windows.push_back(windows_.other_windows[i]);
   }
   int component = windows_.direction == LEFT_RIGHT ? HTRIGHT : HTBOTTOM;
-  window_resizer_.reset(WorkspaceWindowResizer::Create(
+  scoped_ptr<DragDetails> details(new DragDetails(
       windows_.window1,
       location_in_parent,
       component,
-      aura::client::WINDOW_MOVE_SOURCE_MOUSE,
-      windows));
+      aura::client::WINDOW_MOVE_SOURCE_MOUSE));
+  wm::WindowState* window_state = wm::GetWindowState(windows_.window1);
+  window_state->set_drag_details(details.release());
+  window_resizer_.reset(WorkspaceWindowResizer::Create(window_state, windows));
 }
 
 void MultiWindowResizeController::Resize(const gfx::Point& location_in_screen,
                                          int event_flags) {
   gfx::Point location_in_parent(location_in_screen);
   aura::client::GetScreenPositionClient(windows_.window1->GetRootWindow())->
       ConvertPointFromScreen(windows_.window1->parent(), &location_in_parent);
   window_resizer_->Drag(location_in_parent, event_flags);
   gfx::Rect bounds = ScreenAsh::ConvertRectToScreen(
       windows_.window1->parent(),
       CalculateResizeWidgetBounds(location_in_parent));
 
   if (windows_.direction == LEFT_RIGHT)
     bounds.set_y(show_bounds_in_screen_.y());
   else
     bounds.set_x(show_bounds_in_screen_.x());
   resize_widget_->SetBounds(bounds);
 }
 
 void MultiWindowResizeController::CompleteResize() {
   window_resizer_->CompleteDrag();
+  wm::GetWindowState(window_resizer_->GetTarget())->set_drag_details(NULL);
   window_resizer_.reset();
 
   // Mouse may still be over resizer, if not hide.
   gfx::Point screen_loc = Shell::GetScreen()->GetCursorScreenPoint();
   if (!resize_widget_->GetWindowBoundsInScreen().Contains(screen_loc)) {
     Hide();
   } else {
     // If the mouse is over the resizer we need to remove observers on any of
     // the |other_windows|. If we start another resize we'll recalculate the
     // |other_windows| and invoke AddObserver() as necessary.
     for (size_t i = 0; i < windows_.other_windows.size(); ++i)
       windows_.other_windows[i]->RemoveObserver(this);
     windows_.other_windows.clear();
   }
 }
 
 void MultiWindowResizeController::CancelResize() {
   if (!window_resizer_)
     return;  // Happens if window was destroyed and we nuked the WindowResizer.
   window_resizer_->RevertDrag();
+  wm::GetWindowState(window_resizer_->GetTarget())->set_drag_details(NULL);
   window_resizer_.reset();
   Hide();
 }
 
 gfx::Rect MultiWindowResizeController::CalculateResizeWidgetBounds(
     const gfx::Point& location_in_parent) const {
   gfx::Size pref = resize_widget_->GetContentsView()->GetPreferredSize();
   int x = 0, y = 0;
   if (windows_.direction == LEFT_RIGHT) {
     x = windows_.window1->bounds().right() - pref.width() / 2;
@@ skipping 43 matching lines @@
 
   gfx::Point window_loc(location_in_screen);
   aura::Window::ConvertPointToTarget(
       window->GetRootWindow(), window, &window_loc);
   return window->HitTest(window_loc) &&
       window->delegate()->GetNonClientComponent(window_loc) == component;
 }
 
 }  // namespace internal
 }  // namespace ash