ui/app_list/views/contents_view.cc

   1 // Copyright (c) 2012 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/contents_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "grit/ui_resources.h"
  11 #include "ui/app_list/app_list_constants.h"
  12 #include "ui/app_list/app_list_switches.h"
  13 #include "ui/app_list/app_list_view_delegate.h"
  14 #include "ui/app_list/views/app_list_folder_view.h"
  15 #include "ui/app_list/views/app_list_main_view.h"
  16 #include "ui/app_list/views/apps_container_view.h"
  17 #include "ui/app_list/views/apps_grid_view.h"
  18 #include "ui/app_list/views/contents_switcher_view.h"
  19 #include "ui/app_list/views/search_result_list_view.h"
  20 #include "ui/app_list/views/start_page_view.h"
  21 #include "ui/base/resource/resource_bundle.h"
  22 #include "ui/events/event.h"
  23 #include "ui/views/view_model.h"
  24 #include "ui/views/view_model_utils.h"
  25
  26 namespace app_list {
  27
  28 namespace {
  29
  30 const int kMinMouseWheelToSwitchPage = 20;
  31 const int kMinScrollToSwitchPage = 20;
  32 const int kMinHorizVelocityToSwitchPage = 800;
  33
  34 const double kFinishTransitionThreshold = 0.33;
  35
  36 }  // namespace
  37
  38 ContentsView::ContentsView(AppListMainView* app_list_main_view)
  39     : search_results_view_(NULL),
  40       start_page_view_(NULL),
  41       app_list_main_view_(app_list_main_view),
  42       contents_switcher_view_(NULL),
  43       view_model_(new views::ViewModel),
  44       page_before_search_(0) {
  45   pagination_model_.AddObserver(this);
  46 }
  47
  48 ContentsView::~ContentsView() {
  49   pagination_model_.RemoveObserver(this);
  50   if (contents_switcher_view_)
  51     pagination_model_.RemoveObserver(contents_switcher_view_);
  52 }
  53
  54 void ContentsView::InitNamedPages(AppListModel* model,
  55                                   AppListViewDelegate* view_delegate) {
  56   DCHECK(model);
  57
  58   if (app_list::switches::IsExperimentalAppListEnabled()) {
  59     views::View* custom_page_view =
  60         view_delegate->CreateCustomPageWebView(GetLocalBounds().size());
  61     if (custom_page_view)
  62       AddLauncherPage(custom_page_view, IDR_APP_LIST_NOTIFICATIONS_ICON);
  63
  64     start_page_view_ = new StartPageView(app_list_main_view_, view_delegate);
  65     AddLauncherPage(
  66         start_page_view_, IDR_APP_LIST_SEARCH_ICON, NAMED_PAGE_START);
  67   } else {
  68     search_results_view_ =
  69         new SearchResultListView(app_list_main_view_, view_delegate);
  70     AddLauncherPage(search_results_view_, 0, NAMED_PAGE_SEARCH_RESULTS);
  71     search_results_view_->SetResults(model->results());
  72   }
  73
  74   apps_container_view_ = new AppsContainerView(app_list_main_view_, model);
  75
  76   int initial_page_index = AddLauncherPage(
  77       apps_container_view_, IDR_APP_LIST_APPS_ICON, NAMED_PAGE_APPS);
  78   if (app_list::switches::IsExperimentalAppListEnabled())
  79     initial_page_index = GetPageIndexForNamedPage(NAMED_PAGE_START);
  80
  81   page_before_search_ = initial_page_index;
  82   pagination_model_.SelectPage(initial_page_index, false);
  83
  84   // Needed to update the main search box visibility.
  85   ActivePageChanged(false);
  86 }
  87
  88 void ContentsView::CancelDrag() {
  89   if (apps_container_view_->apps_grid_view()->has_dragged_view())
  90     apps_container_view_->apps_grid_view()->EndDrag(true);
  91   if (apps_container_view_->app_list_folder_view()
  92           ->items_grid_view()
  93           ->has_dragged_view()) {
  94     apps_container_view_->app_list_folder_view()->items_grid_view()->EndDrag(
  95         true);
  96   }
  97 }
  98
  99 void ContentsView::SetDragAndDropHostOfCurrentAppList(
 100     ApplicationDragAndDropHost* drag_and_drop_host) {
 101   apps_container_view_->SetDragAndDropHostOfCurrentAppList(drag_and_drop_host);
 102 }
 103
 104 void ContentsView::SetContentsSwitcherView(
 105     ContentsSwitcherView* contents_switcher_view) {
 106   DCHECK(!contents_switcher_view_);
 107   contents_switcher_view_ = contents_switcher_view;
 108   if (contents_switcher_view_)
 109     pagination_model_.AddObserver(contents_switcher_view_);
 110 }
 111
 112 void ContentsView::SetActivePage(int page_index) {
 113   if (GetActivePageIndex() == page_index)
 114     return;
 115
 116   SetActivePageInternal(page_index, false);
 117 }
 118
 119 int ContentsView::GetActivePageIndex() const {
 120   // The active page is changed at the beginning of an animation, not the end.
 121   return pagination_model_.SelectedTargetPage();
 122 }
 123
 124 bool ContentsView::IsNamedPageActive(NamedPage named_page) const {
 125   std::map<NamedPage, int>::const_iterator it =
 126       named_page_to_view_.find(named_page);
 127   if (it == named_page_to_view_.end())
 128     return false;
 129   return it->second == GetActivePageIndex();
 130 }
 131
 132 int ContentsView::GetPageIndexForNamedPage(NamedPage named_page) const {
 133   // Find the index of the view corresponding to the given named_page.
 134   std::map<NamedPage, int>::const_iterator it =
 135       named_page_to_view_.find(named_page);
 136   // GetPageIndexForNamedPage should never be called on a named_page that does
 137   // not have a corresponding view.
 138   DCHECK(it != named_page_to_view_.end());
 139   return it->second;
 140 }
 141
 142 int ContentsView::NumLauncherPages() const {
 143   return pagination_model_.total_pages();
 144 }
 145
 146 void ContentsView::SetActivePageInternal(int page_index,
 147                                          bool show_search_results) {
 148   if (!show_search_results)
 149     page_before_search_ = page_index;
 150   // Start animating to the new page.
 151   pagination_model_.SelectPage(page_index, true);
 152   ActivePageChanged(show_search_results);
 153 }
 154
 155 void ContentsView::ActivePageChanged(bool show_search_results) {
 156   // TODO(xiyuan): Highlight default match instead of the first.
 157   if (IsNamedPageActive(NAMED_PAGE_SEARCH_RESULTS) &&
 158       search_results_view_->visible()) {
 159     search_results_view_->SetSelectedIndex(0);
 160   }
 161   if (search_results_view_)
 162     search_results_view_->UpdateAutoLaunchState();
 163
 164   if (IsNamedPageActive(NAMED_PAGE_START)) {
 165     if (show_search_results)
 166       start_page_view_->ShowSearchResults();
 167     else
 168       start_page_view_->Reset();
 169   }
 170
 171   // Notify parent AppListMainView of the page change.
 172   app_list_main_view_->UpdateSearchBoxVisibility();
 173 }
 174
 175 void ContentsView::ShowSearchResults(bool show) {
 176   int search_page = GetPageIndexForNamedPage(
 177       app_list::switches::IsExperimentalAppListEnabled()
 178           ? NAMED_PAGE_START
 179           : NAMED_PAGE_SEARCH_RESULTS);
 180
 181   SetActivePageInternal(show ? search_page : page_before_search_, show);
 182 }
 183
 184 bool ContentsView::IsShowingSearchResults() const {
 185   return app_list::switches::IsExperimentalAppListEnabled()
 186              ? IsNamedPageActive(NAMED_PAGE_START) &&
 187                    start_page_view_->IsShowingSearchResults()
 188              : IsNamedPageActive(NAMED_PAGE_SEARCH_RESULTS);
 189 }
 190
 191 void ContentsView::UpdatePageBounds() {
 192   gfx::Rect rect(GetContentsBounds());
 193   if (rect.IsEmpty())
 194     return;
 195
 196   // The bounds calculations will potentially be mid-transition (depending on
 197   // the state of the PaginationModel).
 198   int current_page = std::max(0, pagination_model_.selected_page());
 199   int target_page = current_page;
 200   double progress = 1;
 201   if (pagination_model_.has_transition()) {
 202     const PaginationModel::Transition& transition =
 203         pagination_model_.transition();
 204     if (pagination_model_.is_valid_page(transition.target_page)) {
 205       target_page = transition.target_page;
 206       progress = transition.progress;
 207     }
 208   }
 209
 210   gfx::Rect incoming_target(rect);
 211   gfx::Rect outgoing_target(rect);
 212   int dir = target_page > current_page ? -1 : 1;
 213
 214   if (app_list::switches::IsExperimentalAppListEnabled()) {
 215     // The experimental app list transitions horizontally.
 216     int page_width = rect.width();
 217     int transition_offset = progress * page_width * dir;
 218
 219     outgoing_target.set_x(transition_offset);
 220     incoming_target.set_x(dir < 0 ? transition_offset + page_width
 221                                   : transition_offset - page_width);
 222   } else {
 223     // The normal app list transitions vertically.
 224     int page_height = rect.height();
 225     int transition_offset = progress * page_height * dir;
 226
 227     outgoing_target.set_y(transition_offset);
 228     incoming_target.set_y(dir < 0 ? transition_offset + page_height
 229                                   : transition_offset - page_height);
 230   }
 231
 232   view_model_->view_at(current_page)->SetBoundsRect(outgoing_target);
 233   view_model_->view_at(target_page)->SetBoundsRect(incoming_target);
 234 }
 235
 236 PaginationModel* ContentsView::GetAppsPaginationModel() {
 237   return apps_container_view_->apps_grid_view()->pagination_model();
 238 }
 239
 240 void ContentsView::ShowFolderContent(AppListFolderItem* item) {
 241   apps_container_view_->ShowActiveFolder(item);
 242 }
 243
 244 void ContentsView::Prerender() {
 245   const int selected_page =
 246       std::max(0, GetAppsPaginationModel()->selected_page());
 247   apps_container_view_->apps_grid_view()->Prerender(selected_page);
 248 }
 249
 250 views::View* ContentsView::GetPageView(int index) {
 251   return view_model_->view_at(index);
 252 }
 253
 254 void ContentsView::AddBlankPageForTesting() {
 255   AddLauncherPage(new views::View, 0);
 256 }
 257
 258 int ContentsView::AddLauncherPage(views::View* view, int resource_id) {
 259   int page_index = view_model_->view_size();
 260   AddChildView(view);
 261   view_model_->Add(view, page_index);
 262   if (contents_switcher_view_)
 263     contents_switcher_view_->AddSwitcherButton(resource_id, page_index);
 264   pagination_model_.SetTotalPages(view_model_->view_size());
 265   return page_index;
 266 }
 267
 268 int ContentsView::AddLauncherPage(views::View* view,
 269                                   int resource_id,
 270                                   NamedPage named_page) {
 271   int page_index = AddLauncherPage(view, resource_id);
 272   named_page_to_view_.insert(std::pair<NamedPage, int>(named_page, page_index));
 273   return page_index;
 274 }
 275
 276 gfx::Size ContentsView::GetPreferredSize() const {
 277   const gfx::Size container_size =
 278       apps_container_view_->apps_grid_view()->GetPreferredSize();
 279   const gfx::Size results_size = search_results_view_
 280                                      ? search_results_view_->GetPreferredSize()
 281                                      : gfx::Size();
 282
 283   int width = std::max(container_size.width(), results_size.width());
 284   int height = std::max(container_size.height(), results_size.height());
 285   return gfx::Size(width, height);
 286 }
 287
 288 void ContentsView::Layout() {
 289   // Immediately finish all current animations.
 290   pagination_model_.FinishAnimation();
 291
 292   // Move the current view onto the screen, and all other views off screen to
 293   // the left. (Since we are not animating, we don't need to be careful about
 294   // which side we place the off-screen views onto.)
 295   gfx::Rect rect(GetContentsBounds());
 296   if (rect.IsEmpty())
 297     return;
 298
 299   gfx::Rect offscreen_target(rect);
 300   offscreen_target.set_x(-rect.width());
 301
 302   for (int i = 0; i < view_model_->view_size(); ++i) {
 303     view_model_->view_at(i)->SetBoundsRect(
 304         i == pagination_model_.SelectedTargetPage() ? rect : offscreen_target);
 305   }
 306 }
 307
 308 bool ContentsView::OnKeyPressed(const ui::KeyEvent& event) {
 309   return view_model_->view_at(GetActivePageIndex())->OnKeyPressed(event);
 310 }
 311
 312 bool ContentsView::OnMouseWheel(const ui::MouseWheelEvent& event) {
 313   if (!IsNamedPageActive(NAMED_PAGE_APPS))
 314     return false;
 315
 316   int offset;
 317   if (abs(event.x_offset()) > abs(event.y_offset()))
 318     offset = event.x_offset();
 319   else
 320     offset = event.y_offset();
 321
 322   if (abs(offset) > kMinMouseWheelToSwitchPage) {
 323     if (!GetAppsPaginationModel()->has_transition()) {
 324       GetAppsPaginationModel()->SelectPageRelative(offset > 0 ? -1 : 1, true);
 325     }
 326     return true;
 327   }
 328
 329   return false;
 330 }
 331
 332 void ContentsView::TotalPagesChanged() {
 333 }
 334
 335 void ContentsView::SelectedPageChanged(int old_selected, int new_selected) {
 336 }
 337
 338 void ContentsView::TransitionStarted() {
 339 }
 340
 341 void ContentsView::TransitionChanged() {
 342   UpdatePageBounds();
 343 }
 344
 345 void ContentsView::OnGestureEvent(ui::GestureEvent* event) {
 346   if (!IsNamedPageActive(NAMED_PAGE_APPS))
 347     return;
 348
 349   switch (event->type()) {
 350     case ui::ET_GESTURE_SCROLL_BEGIN:
 351       GetAppsPaginationModel()->StartScroll();
 352       event->SetHandled();
 353       return;
 354     case ui::ET_GESTURE_SCROLL_UPDATE:
 355       // event->details.scroll_x() > 0 means moving contents to right. That is,
 356       // transitioning to previous page.
 357       GetAppsPaginationModel()->UpdateScroll(event->details().scroll_x() /
 358                                              GetContentsBounds().width());
 359       event->SetHandled();
 360       return;
 361     case ui::ET_GESTURE_SCROLL_END:
 362       GetAppsPaginationModel()->EndScroll(
 363           GetAppsPaginationModel()->transition().progress <
 364           kFinishTransitionThreshold);
 365       event->SetHandled();
 366       return;
 367     case ui::ET_SCROLL_FLING_START: {
 368       GetAppsPaginationModel()->EndScroll(true);
 369       if (fabs(event->details().velocity_x()) > kMinHorizVelocityToSwitchPage) {
 370         GetAppsPaginationModel()->SelectPageRelative(
 371             event->details().velocity_x() < 0 ? 1 : -1, true);
 372       }
 373       event->SetHandled();
 374       return;
 375     }
 376     default:
 377       break;
 378   }
 379 }
 380
 381 void ContentsView::OnScrollEvent(ui::ScrollEvent* event) {
 382   if (!IsNamedPageActive(NAMED_PAGE_APPS) ||
 383       event->type() == ui::ET_SCROLL_FLING_CANCEL) {
 384     return;
 385   }
 386
 387   float offset;
 388   if (std::abs(event->x_offset()) > std::abs(event->y_offset()))
 389     offset = event->x_offset();
 390   else
 391     offset = event->y_offset();
 392
 393   if (std::abs(offset) > kMinScrollToSwitchPage) {
 394     if (!GetAppsPaginationModel()->has_transition()) {
 395       GetAppsPaginationModel()->SelectPageRelative(offset > 0 ? -1 : 1, true);
 396     }
 397     event->SetHandled();
 398     event->StopPropagation();
 399   }
 400 }
 401
 402 }  // namespace app_list