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