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      1 // Copyright 2013 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 "ui/app_list/views/app_list_folder_view.h"
      6 
      7 #include <algorithm>
      8 
      9 #include "ui/accessibility/ax_view_state.h"
     10 #include "ui/app_list/app_list_constants.h"
     11 #include "ui/app_list/app_list_folder_item.h"
     12 #include "ui/app_list/app_list_model.h"
     13 #include "ui/app_list/views/app_list_item_view.h"
     14 #include "ui/app_list/views/app_list_main_view.h"
     15 #include "ui/app_list/views/apps_container_view.h"
     16 #include "ui/app_list/views/apps_grid_view.h"
     17 #include "ui/app_list/views/contents_view.h"
     18 #include "ui/app_list/views/folder_background_view.h"
     19 #include "ui/app_list/views/folder_header_view.h"
     20 #include "ui/app_list/views/search_box_view.h"
     21 #include "ui/compositor/scoped_layer_animation_settings.h"
     22 #include "ui/events/event.h"
     23 #include "ui/gfx/rect_conversions.h"
     24 #include "ui/strings/grit/ui_strings.h"
     25 #include "ui/views/controls/textfield/textfield.h"
     26 #include "ui/views/view_model.h"
     27 #include "ui/views/view_model_utils.h"
     28 
     29 namespace app_list {
     30 
     31 namespace {
     32 
     33 // Indexes of interesting views in ViewModel of AppListFolderView.
     34 const int kIndexFolderHeader = 0;
     35 const int kIndexChildItems = 1;
     36 
     37 // Threshold for the distance from the center of the item to the circle of the
     38 // folder container ink bubble, beyond which, the item is considered dragged
     39 // out of the folder boundary.
     40 const int kOutOfFolderContainerBubbleDelta = 30;
     41 
     42 }  // namespace
     43 
     44 AppListFolderView::AppListFolderView(AppsContainerView* container_view,
     45                                      AppListModel* model,
     46                                      AppListMainView* app_list_main_view)
     47     : container_view_(container_view),
     48       app_list_main_view_(app_list_main_view),
     49       folder_header_view_(new FolderHeaderView(this)),
     50       view_model_(new views::ViewModel),
     51       model_(model),
     52       folder_item_(NULL),
     53       hide_for_reparent_(false) {
     54   AddChildView(folder_header_view_);
     55   view_model_->Add(folder_header_view_, kIndexFolderHeader);
     56 
     57   items_grid_view_ = new AppsGridView(app_list_main_view_);
     58   items_grid_view_->set_folder_delegate(this);
     59   items_grid_view_->SetLayout(
     60       container_view->apps_grid_view()->cols(),
     61       container_view->apps_grid_view()->rows_per_page());
     62   items_grid_view_->SetModel(model);
     63   AddChildView(items_grid_view_);
     64   view_model_->Add(items_grid_view_, kIndexChildItems);
     65 
     66   SetPaintToLayer(true);
     67   SetFillsBoundsOpaquely(false);
     68 
     69   model_->AddObserver(this);
     70 }
     71 
     72 AppListFolderView::~AppListFolderView() {
     73   model_->RemoveObserver(this);
     74 }
     75 
     76 void AppListFolderView::SetAppListFolderItem(AppListFolderItem* folder) {
     77   accessible_name_ = ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
     78       IDS_APP_LIST_FOLDER_OPEN_FOLDER_ACCESSIBILE_NAME);
     79   NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
     80 
     81   folder_item_ = folder;
     82   items_grid_view_->SetItemList(folder_item_->item_list());
     83   folder_header_view_->SetFolderItem(folder_item_);
     84 }
     85 
     86 void AppListFolderView::ScheduleShowHideAnimation(bool show,
     87                                                   bool hide_for_reparent) {
     88   hide_for_reparent_ = hide_for_reparent;
     89 
     90   // Stop any previous animation.
     91   layer()->GetAnimator()->StopAnimating();
     92 
     93   // Hide the top items temporarily if showing the view for opening the folder.
     94   if (show)
     95     items_grid_view_->SetTopItemViewsVisible(false);
     96 
     97   // Set initial state.
     98   layer()->SetOpacity(show ? 0.0f : 1.0f);
     99   SetVisible(true);
    100   UpdateFolderNameVisibility(true);
    101 
    102   ui::ScopedLayerAnimationSettings animation(layer()->GetAnimator());
    103   animation.SetTweenType(
    104       show ? kFolderFadeInTweenType : kFolderFadeOutTweenType);
    105   animation.AddObserver(this);
    106   animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
    107       show ? kFolderTransitionInDurationMs : kFolderTransitionOutDurationMs));
    108 
    109   layer()->SetOpacity(show ? 1.0f : 0.0f);
    110 }
    111 
    112 gfx::Size AppListFolderView::GetPreferredSize() const {
    113   const gfx::Size header_size = folder_header_view_->GetPreferredSize();
    114   const gfx::Size grid_size = items_grid_view_->GetPreferredSize();
    115   int width = std::max(header_size.width(), grid_size.width());
    116   int height = header_size.height() + grid_size.height();
    117   return gfx::Size(width, height);
    118 }
    119 
    120 void AppListFolderView::Layout() {
    121   CalculateIdealBounds();
    122   views::ViewModelUtils::SetViewBoundsToIdealBounds(*view_model_);
    123 }
    124 
    125 bool AppListFolderView::OnKeyPressed(const ui::KeyEvent& event) {
    126   return items_grid_view_->OnKeyPressed(event);
    127 }
    128 
    129 void AppListFolderView::OnAppListItemWillBeDeleted(AppListItem* item) {
    130   if (item == folder_item_) {
    131     items_grid_view_->OnFolderItemRemoved();
    132     folder_header_view_->OnFolderItemRemoved();
    133     folder_item_ = NULL;
    134 
    135     // Do not change state if it is hidden.
    136     if (hide_for_reparent_ || layer()->opacity() == 0.0f)
    137       return;
    138 
    139     // If the folder item associated with this view is removed from the model,
    140     // (e.g. the last item in the folder was deleted), reset the view and signal
    141     // the container view to show the app list instead.
    142     // Pass NULL to ShowApps() to avoid triggering animation from the deleted
    143     // folder.
    144     container_view_->ShowApps(NULL);
    145   }
    146 }
    147 
    148 void AppListFolderView::OnImplicitAnimationsCompleted() {
    149   // Show the top items when the opening folder animation is done.
    150   if (layer()->opacity() == 1.0f)
    151     items_grid_view_->SetTopItemViewsVisible(true);
    152 
    153   // If the view is hidden for reparenting a folder item, it has to be visible,
    154   // so that drag_view_ can keep receiving mouse events.
    155   if (layer()->opacity() == 0.0f && !hide_for_reparent_)
    156     SetVisible(false);
    157 
    158   // Set the view bounds to a small rect, so that it won't overlap the root
    159   // level apps grid view during folder item reprenting transitional period.
    160   if (hide_for_reparent_)
    161     SetBoundsRect(gfx::Rect(bounds().x(), bounds().y(), 1, 1));
    162 }
    163 
    164 void AppListFolderView::CalculateIdealBounds() {
    165   gfx::Rect rect(GetContentsBounds());
    166   if (rect.IsEmpty())
    167     return;
    168 
    169   gfx::Rect header_frame(rect);
    170   gfx::Size size = folder_header_view_->GetPreferredSize();
    171   header_frame.set_height(size.height());
    172   view_model_->set_ideal_bounds(kIndexFolderHeader, header_frame);
    173 
    174   gfx::Rect grid_frame(rect);
    175   grid_frame.Subtract(header_frame);
    176   view_model_->set_ideal_bounds(kIndexChildItems, grid_frame);
    177 }
    178 
    179 void AppListFolderView::StartSetupDragInRootLevelAppsGridView(
    180     AppListItemView* original_drag_view,
    181     const gfx::Point& drag_point_in_root_grid) {
    182   // Converts the original_drag_view's bounds to the coordinate system of
    183   // root level grid view.
    184   gfx::RectF rect_f(original_drag_view->bounds());
    185   views::View::ConvertRectToTarget(items_grid_view_,
    186                                    container_view_->apps_grid_view(),
    187                                    &rect_f);
    188   gfx::Rect rect_in_root_grid_view = gfx::ToEnclosingRect(rect_f);
    189 
    190   container_view_->apps_grid_view()->
    191       InitiateDragFromReparentItemInRootLevelGridView(
    192           original_drag_view, rect_in_root_grid_view, drag_point_in_root_grid);
    193 }
    194 
    195 gfx::Rect AppListFolderView::GetItemIconBoundsAt(int index) {
    196   AppListItemView* item_view = items_grid_view_->GetItemViewAt(index);
    197   // Icon bounds relative to AppListItemView.
    198   const gfx::Rect icon_bounds = item_view->GetIconBounds();
    199   gfx::Rect to_apps_grid_view = item_view->ConvertRectToParent(icon_bounds);
    200   gfx::Rect to_folder =
    201       items_grid_view_->ConvertRectToParent(to_apps_grid_view);
    202 
    203   // Get the icon image's bound.
    204   to_folder.ClampToCenteredSize(
    205       gfx::Size(kGridIconDimension, kGridIconDimension));
    206 
    207   return to_folder;
    208 }
    209 
    210 void AppListFolderView::UpdateFolderViewBackground(bool show_bubble) {
    211   if (hide_for_reparent_)
    212     return;
    213 
    214   // Before showing the folder container inking bubble, hide the folder name.
    215   if (show_bubble)
    216     UpdateFolderNameVisibility(false);
    217 
    218   container_view_->folder_background_view()->UpdateFolderContainerBubble(
    219       show_bubble ? FolderBackgroundView::SHOW_BUBBLE :
    220                     FolderBackgroundView::HIDE_BUBBLE);
    221 }
    222 
    223 void AppListFolderView::UpdateFolderNameVisibility(bool visible) {
    224   folder_header_view_->UpdateFolderNameVisibility(visible);
    225 }
    226 
    227 bool AppListFolderView::IsPointOutsideOfFolderBoundary(
    228     const gfx::Point& point) {
    229   if (!GetLocalBounds().Contains(point))
    230     return true;
    231 
    232   gfx::Point center = GetLocalBounds().CenterPoint();
    233   float delta = (point - center).Length();
    234   return delta > container_view_->folder_background_view()->
    235       GetFolderContainerBubbleRadius() + kOutOfFolderContainerBubbleDelta;
    236 }
    237 
    238 // When user drags a folder item out of the folder boundary ink bubble, the
    239 // folder view UI will be hidden, and switch back to top level AppsGridView.
    240 // The dragged item will seamlessly move on the top level AppsGridView.
    241 // In order to achieve the above, we keep the folder view and its child grid
    242 // view visible with opacity 0, so that the drag_view_ on the hidden grid view
    243 // will keep receiving mouse event. At the same time, we initiated a new
    244 // drag_view_ in the top level grid view, and keep it moving with the hidden
    245 // grid view's drag_view_, so that the dragged item can be engaged in drag and
    246 // drop flow in the top level grid view. During the reparenting process, the
    247 // drag_view_ in hidden grid view will dispatch the drag and drop event to
    248 // the top level grid view, until the drag ends.
    249 void AppListFolderView::ReparentItem(
    250     AppListItemView* original_drag_view,
    251     const gfx::Point& drag_point_in_folder_grid) {
    252   // Convert the drag point relative to the root level AppsGridView.
    253   gfx::Point to_root_level_grid = drag_point_in_folder_grid;
    254   ConvertPointToTarget(items_grid_view_,
    255                        container_view_->apps_grid_view(),
    256                        &to_root_level_grid);
    257   StartSetupDragInRootLevelAppsGridView(original_drag_view, to_root_level_grid);
    258   container_view_->ReparentFolderItemTransit(folder_item_);
    259 }
    260 
    261 void AppListFolderView::DispatchDragEventForReparent(
    262     AppsGridView::Pointer pointer,
    263     const gfx::Point& drag_point_in_folder_grid) {
    264   AppsGridView* root_grid = container_view_->apps_grid_view();
    265   gfx::Point drag_point_in_root_grid = drag_point_in_folder_grid;
    266   ConvertPointToTarget(items_grid_view_, root_grid, &drag_point_in_root_grid);
    267   root_grid->UpdateDragFromReparentItem(pointer, drag_point_in_folder_grid);
    268 }
    269 
    270 void AppListFolderView::DispatchEndDragEventForReparent(
    271     bool events_forwarded_to_drag_drop_host,
    272     bool cancel_drag) {
    273   container_view_->apps_grid_view()->EndDragFromReparentItemInRootLevel(
    274       events_forwarded_to_drag_drop_host, cancel_drag);
    275 }
    276 
    277 void AppListFolderView::HideViewImmediately() {
    278   SetVisible(false);
    279   hide_for_reparent_ = false;
    280 }
    281 
    282 void AppListFolderView::CloseFolderPage() {
    283   accessible_name_ = ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
    284       IDS_APP_LIST_FOLDER_CLOSE_FOLDER_ACCESSIBILE_NAME);
    285   NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
    286 
    287   GiveBackFocusToSearchBox();
    288   if (items_grid_view()->dragging())
    289     items_grid_view()->EndDrag(true);
    290   items_grid_view()->ClearAnySelectedView();
    291   container_view_->ShowApps(folder_item_);
    292 }
    293 
    294 bool AppListFolderView::IsOEMFolder() const {
    295   return folder_item_->folder_type() == AppListFolderItem::FOLDER_TYPE_OEM;
    296 }
    297 
    298 void AppListFolderView::SetRootLevelDragViewVisible(bool visible) {
    299   container_view_->apps_grid_view()->SetDragViewVisible(visible);
    300 }
    301 
    302 void AppListFolderView::GetAccessibleState(ui::AXViewState* state) {
    303   state->role = ui::AX_ROLE_BUTTON;
    304   state->name = accessible_name_;
    305 }
    306 
    307 void AppListFolderView::NavigateBack(AppListFolderItem* item,
    308                                      const ui::Event& event_flags) {
    309   CloseFolderPage();
    310 }
    311 
    312 void AppListFolderView::GiveBackFocusToSearchBox() {
    313   app_list_main_view_->search_box_view()->search_box()->RequestFocus();
    314 }
    315 
    316 void AppListFolderView::SetItemName(AppListFolderItem* item,
    317                                     const std::string& name) {
    318   model_->SetItemName(item, name);
    319 }
    320 
    321 }  // namespace app_list
    322