Prevents panels attached to shelf from docking

ash/wm/drag_details.cc

+// Copyright 2013 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/drag_details.h"
+
+#include "ash/wm/window_resizer.h"
+#include "ui/aura/window.h"
+#include "ui/base/hit_test.h"
+
+namespace ash {
+
+namespace {
+
+int GetSizeChangeDirectionForWindowComponent(int window_component) {
+  int size_change_direction = WindowResizer::kBoundsChangeDirection_None;
+  switch (window_component) {
+    case HTTOPLEFT:
+    case HTTOPRIGHT:
+    case HTBOTTOMLEFT:
+    case HTBOTTOMRIGHT:
+    case HTGROWBOX:
+    case HTCAPTION:
+      size_change_direction |=
+          WindowResizer::kBoundsChangeDirection_Horizontal |
+          WindowResizer::kBoundsChangeDirection_Vertical;
+      break;
+    case HTTOP:
+    case HTBOTTOM:
+      size_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
+      break;
+    case HTRIGHT:
+    case HTLEFT:
+      size_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
+      break;
+    default:
+      break;
+  }
+  return size_change_direction;
+}
+
+}  // namespace
+
+DragDetails::DragDetails(aura::Window* window,
+                         const gfx::Point& location,
+                         int window_component,
+                         aura::client::WindowMoveSource source)
+    : initial_bounds_in_parent(window->bounds()),
+      initial_location_in_parent(location),
+      initial_opacity(window->layer()->opacity()),
+      window_component(window_component),
+      bounds_change(
+          WindowResizer::GetBoundsChangeForWindowComponent(window_component)),
+      position_change_direction(
+          WindowResizer::GetPositionChangeDirectionForWindowComponent(
+              window_component)),
+      size_change_direction(
+          GetSizeChangeDirectionForWindowComponent(window_component)),
+      is_resizable(bounds_change != WindowResizer::kBoundsChangeDirection_None),
+      source(source),
+      should_attach_to_shelf(window->type() == ui::wm::WINDOW_TYPE_PANEL &&
+                             wm::GetWindowState(window)->panel_attached()),
+      window_resizer(NULL) {
+  wm::WindowState* window_state = wm::GetWindowState(window);
+  if (window_state->IsNormalShowState() &&
+      window_state->HasRestoreBounds() &&
+      window_component == HTCAPTION)
+    restore_bounds = window_state->GetRestoreBoundsInScreen();
+}
+
+DragDetails::~DragDetails() {
+}
+
+}  // namespace ash