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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/wm/panels/attached_panel_window_targeter.h"
      6 
      7 #include "ash/shelf/shelf.h"
      8 #include "ash/shell.h"
      9 #include "ash/wm/panels/panel_layout_manager.h"
     10 
     11 namespace ash {
     12 
     13 AttachedPanelWindowTargeter::AttachedPanelWindowTargeter(
     14     aura::Window* container,
     15     const gfx::Insets& default_mouse_extend,
     16     const gfx::Insets& default_touch_extend,
     17     PanelLayoutManager* panel_layout_manager)
     18     : ::wm::EasyResizeWindowTargeter(container,
     19                                      default_mouse_extend,
     20                                      default_touch_extend),
     21       panel_container_(container),
     22       panel_layout_manager_(panel_layout_manager),
     23       default_touch_extend_(default_touch_extend) {
     24   Shell::GetInstance()->AddShellObserver(this);
     25 }
     26 
     27 AttachedPanelWindowTargeter::~AttachedPanelWindowTargeter() {
     28   Shell::GetInstance()->RemoveShellObserver(this);
     29 }
     30 
     31 void AttachedPanelWindowTargeter::OnShelfCreatedForRootWindow(
     32     aura::Window* root_window) {
     33   UpdateTouchExtend(root_window);
     34 }
     35 
     36 void AttachedPanelWindowTargeter::OnShelfAlignmentChanged(
     37     aura::Window* root_window) {
     38   // Don't update the touch insets if the shelf has not yet been created.
     39   if (!panel_layout_manager_->shelf())
     40     return;
     41 
     42   UpdateTouchExtend(root_window);
     43 }
     44 
     45 void AttachedPanelWindowTargeter::UpdateTouchExtend(aura::Window* root_window) {
     46   // Only update the touch insets for panels if they are attached to the shelf
     47   // in |root_window|.
     48   if (panel_container_->GetRootWindow() != root_window)
     49     return;
     50 
     51   DCHECK(panel_layout_manager_->shelf());
     52 
     53   gfx::Insets touch(default_touch_extend_);
     54   switch (panel_layout_manager_->shelf()->alignment()) {
     55     case SHELF_ALIGNMENT_BOTTOM:
     56       touch = gfx::Insets(touch.top(), touch.left(), 0, touch.right());
     57       break;
     58     case SHELF_ALIGNMENT_LEFT:
     59       touch = gfx::Insets(touch.top(), 0, touch.bottom(), touch.right());
     60       break;
     61     case SHELF_ALIGNMENT_RIGHT:
     62       touch = gfx::Insets(touch.top(), touch.left(), touch.bottom(), 0);
     63       break;
     64     case SHELF_ALIGNMENT_TOP:
     65       touch = gfx::Insets(0, touch.left(), touch.bottom(), touch.right());
     66       break;
     67     default:
     68       NOTREACHED();
     69       return;
     70   }
     71 
     72   set_touch_extend(touch);
     73 }
     74 
     75 }  // namespace ash
     76