Dragging panels near screen edge

ash/wm/panels/panel_layout_manager.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/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/wm/frame_painter.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_animations.h"
+#include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/focus_manager.h"
@@ skipping 291 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, aura::LayoutManager implementation:
 void PanelLayoutManager::OnWindowResized() {
   Relayout();
 }
 
 void PanelLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
   if (child->type() == aura::client::WINDOW_TYPE_POPUP)
     return;

[flackr, 2013/06/20 02:18:56]

If there's not an easy way to avoid the panel being added to the panel layout
manager we *could* check the attached key here and reparent the panel if it's
not actually attached. This would do quite the reparenting dance and I suspect
we'd want a better long term solution but it should do the right thing.

   PanelInfo panel_info;
   panel_info.window = child;
   panel_info.callout_widget = new PanelCalloutWidget(panel_container_);
   if (child != dragged_panel_) {
     // Set the panel to 0 opacity until it has been positioned to prevent it
     // from flashing briefly at position (0, 0).
     child->layer()->SetOpacity(0);
     panel_info.slide_in = true;
   }
   panel_windows_.push_back(panel_info);
@@ skipping 316 matching lines @@
       on_launcher = true;
     }
 
     if (on_launcher) {
       ui::ScopedLayerAnimationSettings panel_slide_settings(
           layer->GetAnimator());
       panel_slide_settings.SetPreemptionStrategy(
           ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
       panel_slide_settings.SetTransitionDuration(
           base::TimeDelta::FromMilliseconds(kPanelSlideDurationMilliseconds));
+      visible_panels[i].window->SetProperty(internal::kPanelAttachedKey, true);
       SetChildBoundsDirect(visible_panels[i].window, bounds);
       if (slide_in)
         layer->SetOpacity(1);
     } else {
       // If the launcher moved don't animate, move immediately to the new
       // target location.
       SetChildBoundsDirect(visible_panels[i].window, bounds);
     }
   }
 
@@ skipping 147 matching lines @@
 
 void PanelLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propogate automatically to this class, so manually recalculate bounds.
   OnWindowResized();
 }
 
 }  // namespace internal
 }  // namespace ash