src/ui/app_list/views/app_list_item_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/app_list_item_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "grit/ui_strings.h"
  11 #include "ui/accessibility/ax_view_state.h"
  12 #include "ui/app_list/app_list_constants.h"
  13 #include "ui/app_list/app_list_folder_item.h"
  14 #include "ui/app_list/app_list_item.h"
  15 #include "ui/app_list/app_list_switches.h"
  16 #include "ui/app_list/views/apps_grid_view.h"
  17 #include "ui/app_list/views/cached_label.h"
  18 #include "ui/app_list/views/progress_bar_view.h"
  19 #include "ui/base/dragdrop/drag_utils.h"
  20 #include "ui/base/l10n/l10n_util.h"
  21 #include "ui/base/resource/resource_bundle.h"
  22 #include "ui/compositor/layer.h"
  23 #include "ui/compositor/scoped_layer_animation_settings.h"
  24 #include "ui/gfx/animation/throb_animation.h"
  25 #include "ui/gfx/canvas.h"
  26 #include "ui/gfx/font_list.h"
  27 #include "ui/gfx/image/image_skia_operations.h"
  28 #include "ui/gfx/point.h"
  29 #include "ui/gfx/transform_util.h"
  30 #include "ui/views/background.h"
  31 #include "ui/views/controls/image_view.h"
  32 #include "ui/views/controls/label.h"
  33 #include "ui/views/controls/menu/menu_runner.h"
  34 #include "ui/views/drag_controller.h"
  35
  36 namespace app_list {
  37
  38 namespace {
  39
  40 const int kTopPadding = 20;
  41 const int kIconTitleSpacing = 7;
  42 const int kProgressBarHorizontalPadding = 12;
  43
  44 // The font is different on each platform. The font size is adjusted on some
  45 // platforms to keep a consistent look.
  46 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
  47 // Reducing the font size by 2 makes it the same as the Windows font size.
  48 const int kFontSizeDelta = -2;
  49 #else
  50 const int kFontSizeDelta = 0;
  51 #endif
  52
  53 // Radius of the folder dropping preview circle.
  54 const int kFolderPreviewRadius = 40;
  55
  56 const int kLeftRightPaddingChars = 1;
  57
  58 // Scale to transform the icon when a drag starts.
  59 const float kDraggingIconScale = 1.5f;
  60
  61 // Delay in milliseconds of when the dragging UI should be shown for mouse drag.
  62 const int kMouseDragUIDelayInMs = 200;
  63
  64 }  // namespace
  65
  66 // static
  67 const char AppListItemView::kViewClassName[] = "ui/app_list/AppListItemView";
  68
  69 AppListItemView::AppListItemView(AppsGridView* apps_grid_view,
  70                                  AppListItem* item)
  71     : CustomButton(apps_grid_view),
  72       item_(item),
  73       apps_grid_view_(apps_grid_view),
  74       icon_(new views::ImageView),
  75       title_(new CachedLabel),
  76       progress_bar_(new ProgressBarView),
  77       ui_state_(UI_STATE_NORMAL),
  78       touch_dragging_(false) {
  79   icon_->set_interactive(false);
  80
  81   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  82   title_->SetBackgroundColor(0);
  83   title_->SetAutoColorReadabilityEnabled(false);
  84   title_->SetEnabledColor(kGridTitleColor);
  85   title_->SetFontList(
  86       rb.GetFontList(kItemTextFontStyle).DeriveWithSizeDelta(kFontSizeDelta));
  87   title_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
  88   title_->SetVisible(!item_->is_installing());
  89   title_->Invalidate();
  90   SetTitleSubpixelAA();
  91
  92   const gfx::ShadowValue kIconShadows[] = {
  93     gfx::ShadowValue(gfx::Point(0, 2), 2, SkColorSetARGB(0x24, 0, 0, 0)),
  94   };
  95   icon_shadows_.assign(kIconShadows, kIconShadows + arraysize(kIconShadows));
  96
  97   AddChildView(icon_);
  98   AddChildView(title_);
  99   AddChildView(progress_bar_);
 100
 101   ItemIconChanged();
 102   ItemNameChanged();
 103   ItemIsInstallingChanged();
 104   item_->AddObserver(this);
 105
 106   set_context_menu_controller(this);
 107   set_request_focus_on_press(false);
 108
 109   SetAnimationDuration(0);
 110 }
 111
 112 AppListItemView::~AppListItemView() {
 113   item_->RemoveObserver(this);
 114 }
 115
 116 void AppListItemView::SetIconSize(const gfx::Size& size) {
 117   if (icon_size_ == size)
 118     return;
 119
 120   icon_size_ = size;
 121   UpdateIcon();
 122 }
 123
 124 void AppListItemView::UpdateIcon() {
 125   // Skip if |icon_size_| has not been determined.
 126   if (icon_size_.IsEmpty())
 127     return;
 128
 129   gfx::ImageSkia icon = item_->icon();
 130   // Clear icon and bail out if item icon is empty.
 131   if (icon.isNull()) {
 132     icon_->SetImage(NULL);
 133     return;
 134   }
 135
 136   gfx::ImageSkia resized(gfx::ImageSkiaOperations::CreateResizedImage(icon,
 137       skia::ImageOperations::RESIZE_BEST, icon_size_));
 138   if (item_->has_shadow()) {
 139     gfx::ImageSkia shadow(
 140         gfx::ImageSkiaOperations::CreateImageWithDropShadow(resized,
 141                                                             icon_shadows_));
 142     icon_->SetImage(shadow);
 143     return;
 144   }
 145
 146   icon_->SetImage(resized);
 147 }
 148
 149 void AppListItemView::UpdateTooltip() {
 150   std::string display_name = item_->GetDisplayName();
 151   title_->SetTooltipText(display_name == item_->name() ? base::string16()
 152                          : base::UTF8ToUTF16(item_->name()));
 153 }
 154
 155 void AppListItemView::SetUIState(UIState state) {
 156   if (ui_state_ == state)
 157     return;
 158
 159   ui_state_ = state;
 160
 161   switch (ui_state_) {
 162     case UI_STATE_NORMAL:
 163       title_->SetVisible(!item_->is_installing());
 164       progress_bar_->SetVisible(item_->is_installing());
 165       break;
 166     case UI_STATE_DRAGGING:
 167       title_->SetVisible(false);
 168       progress_bar_->SetVisible(false);
 169       break;
 170     case UI_STATE_DROPPING_IN_FOLDER:
 171       break;
 172   }
 173 #if !defined(OS_WIN)
 174   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
 175   switch (ui_state_) {
 176     case UI_STATE_NORMAL:
 177       layer()->SetTransform(gfx::Transform());
 178       break;
 179     case UI_STATE_DRAGGING: {
 180       const gfx::Rect bounds(layer()->bounds().size());
 181       layer()->SetTransform(gfx::GetScaleTransform(
 182           bounds.CenterPoint(),
 183           kDraggingIconScale));
 184       break;
 185     }
 186     case UI_STATE_DROPPING_IN_FOLDER:
 187       break;
 188   }
 189 #endif  // !OS_WIN
 190
 191   SchedulePaint();
 192 }
 193
 194 void AppListItemView::SetTouchDragging(bool touch_dragging) {
 195   if (touch_dragging_ == touch_dragging)
 196     return;
 197
 198   touch_dragging_ = touch_dragging;
 199   SetUIState(touch_dragging_ ? UI_STATE_DRAGGING : UI_STATE_NORMAL);
 200 }
 201
 202 void AppListItemView::OnMouseDragTimer() {
 203   DCHECK(apps_grid_view_->IsDraggedView(this));
 204   SetUIState(UI_STATE_DRAGGING);
 205 }
 206
 207 void AppListItemView::SetTitleSubpixelAA() {
 208   // TODO(tapted): Enable AA for folders as well, taking care to play nice with
 209   // the folder bubble animation.
 210   bool enable_aa = !item_->IsInFolder() && ui_state_ == UI_STATE_NORMAL &&
 211                    !item_->highlighted() &&
 212                    !apps_grid_view_->IsSelectedView(this) &&
 213                    !apps_grid_view_->IsAnimatingView(this);
 214
 215   bool currently_enabled = title_->background() != NULL;
 216   if (currently_enabled == enable_aa)
 217     return;
 218
 219   if (enable_aa) {
 220     title_->SetBackgroundColor(app_list::kContentsBackgroundColor);
 221     title_->set_background(views::Background::CreateSolidBackground(
 222         app_list::kContentsBackgroundColor));
 223   } else {
 224     // In other cases, keep the background transparent to ensure correct
 225     // interactions with animations. This will temporarily disable subpixel AA.
 226     title_->SetBackgroundColor(0);
 227     title_->set_background(NULL);
 228   }
 229   title_->Invalidate();
 230   title_->SchedulePaint();
 231 }
 232
 233 void AppListItemView::Prerender() {
 234   title_->PaintToBackingImage();
 235 }
 236
 237 void AppListItemView::CancelContextMenu() {
 238   if (context_menu_runner_)
 239     context_menu_runner_->Cancel();
 240 }
 241
 242 gfx::ImageSkia AppListItemView::GetDragImage() {
 243   return icon_->GetImage();
 244 }
 245
 246 void AppListItemView::OnDragEnded() {
 247   mouse_drag_timer_.Stop();
 248   SetUIState(UI_STATE_NORMAL);
 249 }
 250
 251 gfx::Point AppListItemView::GetDragImageOffset() {
 252   gfx::Point image = icon_->GetImageBounds().origin();
 253   return gfx::Point(icon_->x() + image.x(), icon_->y() + image.y());
 254 }
 255
 256 void AppListItemView::SetAsAttemptedFolderTarget(bool is_target_folder) {
 257   if (is_target_folder)
 258     SetUIState(UI_STATE_DROPPING_IN_FOLDER);
 259   else
 260     SetUIState(UI_STATE_NORMAL);
 261 }
 262
 263 void AppListItemView::ItemIconChanged() {
 264   UpdateIcon();
 265 }
 266
 267 void AppListItemView::ItemNameChanged() {
 268   title_->SetText(base::UTF8ToUTF16(item_->GetDisplayName()));
 269   title_->Invalidate();
 270   UpdateTooltip();
 271   // Use full name for accessibility.
 272   SetAccessibleName(item_->GetItemType() == AppListFolderItem::kItemType
 273                         ? l10n_util::GetStringFUTF16(
 274                               IDS_APP_LIST_FOLDER_BUTTON_ACCESSIBILE_NAME,
 275                               base::UTF8ToUTF16(item_->name()))
 276                         : base::UTF8ToUTF16(item_->name()));
 277   Layout();
 278 }
 279
 280 void AppListItemView::ItemHighlightedChanged() {
 281   apps_grid_view_->EnsureViewVisible(this);
 282   SchedulePaint();
 283 }
 284
 285 void AppListItemView::ItemIsInstallingChanged() {
 286   if (item_->is_installing())
 287     apps_grid_view_->EnsureViewVisible(this);
 288   title_->SetVisible(!item_->is_installing());
 289   progress_bar_->SetVisible(item_->is_installing());
 290   SchedulePaint();
 291 }
 292
 293 void AppListItemView::ItemPercentDownloadedChanged() {
 294   // A percent_downloaded() of -1 can mean it's not known how much percent is
 295   // completed, or the download hasn't been marked complete, as is the case
 296   // while an extension is being installed after being downloaded.
 297   if (item_->percent_downloaded() == -1)
 298     return;
 299   progress_bar_->SetValue(item_->percent_downloaded() / 100.0);
 300 }
 301
 302 const char* AppListItemView::GetClassName() const {
 303   return kViewClassName;
 304 }
 305
 306 void AppListItemView::Layout() {
 307   gfx::Rect rect(GetContentsBounds());
 308
 309   const int left_right_padding =
 310       title_->font_list().GetExpectedTextWidth(kLeftRightPaddingChars);
 311   rect.Inset(left_right_padding, kTopPadding, left_right_padding, 0);
 312   const int y = rect.y();
 313
 314   icon_->SetBoundsRect(GetIconBoundsForTargetViewBounds(GetContentsBounds()));
 315   const gfx::Size title_size = title_->GetPreferredSize();
 316   gfx::Rect title_bounds(rect.x() + (rect.width() - title_size.width()) / 2,
 317                          y + icon_size_.height() + kIconTitleSpacing,
 318                          title_size.width(),
 319                          title_size.height());
 320   title_bounds.Intersect(rect);
 321   title_->SetBoundsRect(title_bounds);
 322
 323   gfx::Rect progress_bar_bounds(progress_bar_->GetPreferredSize());
 324   progress_bar_bounds.set_x(GetContentsBounds().x() +
 325                             kProgressBarHorizontalPadding);
 326   progress_bar_bounds.set_y(title_bounds.y());
 327   progress_bar_->SetBoundsRect(progress_bar_bounds);
 328 }
 329
 330 void AppListItemView::SchedulePaintInRect(const gfx::Rect& r) {
 331   SetTitleSubpixelAA();
 332   views::CustomButton::SchedulePaintInRect(r);
 333 }
 334
 335 void AppListItemView::OnPaint(gfx::Canvas* canvas) {
 336   if (apps_grid_view_->IsDraggedView(this))
 337     return;
 338
 339   gfx::Rect rect(GetContentsBounds());
 340   if (item_->highlighted() && !item_->is_installing()) {
 341     canvas->FillRect(rect, kHighlightedColor);
 342     return;
 343   } else if (apps_grid_view_->IsSelectedView(this)) {
 344       canvas->FillRect(rect, kSelectedColor);
 345   }
 346
 347   if (!switches::IsFolderUIEnabled()) {
 348     if (apps_grid_view_->IsSelectedView(this)) {
 349       canvas->FillRect(rect, kSelectedColor);
 350     } else if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
 351       canvas->FillRect(rect, kHighlightedColor);
 352     }
 353   } else if (ui_state_ == UI_STATE_DROPPING_IN_FOLDER) {
 354     // Draw folder dropping preview circle.
 355     gfx::Point center = gfx::Point(icon_->x() + icon_->size().width() / 2,
 356                                    icon_->y() + icon_->size().height() / 2);
 357     SkPaint paint;
 358     paint.setStyle(SkPaint::kFill_Style);
 359     paint.setAntiAlias(true);
 360     paint.setColor(kFolderBubbleColor);
 361     canvas->DrawCircle(center, kFolderPreviewRadius, paint);
 362   }
 363 }
 364
 365 void AppListItemView::ShowContextMenuForView(views::View* source,
 366                                              const gfx::Point& point,
 367                                              ui::MenuSourceType source_type) {
 368   ui::MenuModel* menu_model = item_->GetContextMenuModel();
 369   if (!menu_model)
 370     return;
 371
 372   context_menu_runner_.reset(new views::MenuRunner(menu_model));
 373   if (context_menu_runner_->RunMenuAt(GetWidget(),
 374                                       NULL,
 375                                       gfx::Rect(point, gfx::Size()),
 376                                       views::MENU_ANCHOR_TOPLEFT,
 377                                       source_type,
 378                                       views::MenuRunner::HAS_MNEMONICS) ==
 379       views::MenuRunner::MENU_DELETED) {
 380     return;
 381   }
 382 }
 383
 384 void AppListItemView::StateChanged() {
 385   const bool is_folder_ui_enabled = switches::IsFolderUIEnabled();
 386   if (is_folder_ui_enabled)
 387     apps_grid_view_->ClearAnySelectedView();
 388
 389   if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
 390     if (!is_folder_ui_enabled)
 391       apps_grid_view_->SetSelectedView(this);
 392     title_->SetEnabledColor(kGridTitleHoverColor);
 393   } else {
 394     if (!is_folder_ui_enabled)
 395       apps_grid_view_->ClearSelectedView(this);
 396     item_->SetHighlighted(false);
 397     title_->SetEnabledColor(kGridTitleColor);
 398   }
 399   title_->Invalidate();
 400 }
 401
 402 bool AppListItemView::ShouldEnterPushedState(const ui::Event& event) {
 403   // Don't enter pushed state for ET_GESTURE_TAP_DOWN so that hover gray
 404   // background does not show up during scroll.
 405   if (event.type() == ui::ET_GESTURE_TAP_DOWN)
 406     return false;
 407
 408   return views::CustomButton::ShouldEnterPushedState(event);
 409 }
 410
 411 bool AppListItemView::OnMousePressed(const ui::MouseEvent& event) {
 412   CustomButton::OnMousePressed(event);
 413
 414   if (!ShouldEnterPushedState(event))
 415     return true;
 416
 417   apps_grid_view_->InitiateDrag(this, AppsGridView::MOUSE, event);
 418
 419   if (apps_grid_view_->IsDraggedView(this)) {
 420     mouse_drag_timer_.Start(FROM_HERE,
 421         base::TimeDelta::FromMilliseconds(kMouseDragUIDelayInMs),
 422         this, &AppListItemView::OnMouseDragTimer);
 423   }
 424   return true;
 425 }
 426
 427 bool AppListItemView::OnKeyPressed(const ui::KeyEvent& event) {
 428   // Disable space key to press the button. The keyboard events received
 429   // by this view are forwarded from a Textfield (SearchBoxView) and key
 430   // released events are not forwarded. This leaves the button in pressed
 431   // state.
 432   if (event.key_code() == ui::VKEY_SPACE)
 433     return false;
 434
 435   return CustomButton::OnKeyPressed(event);
 436 }
 437
 438 void AppListItemView::OnMouseReleased(const ui::MouseEvent& event) {
 439   CustomButton::OnMouseReleased(event);
 440   apps_grid_view_->EndDrag(false);
 441 }
 442
 443 void AppListItemView::OnMouseCaptureLost() {
 444   // We don't cancel the dag on mouse capture lost for windows as entering a
 445   // synchronous drag causes mouse capture to be lost and pressing escape
 446   // dismisses the app list anyway.
 447 #if !defined(OS_WIN)
 448   CustomButton::OnMouseCaptureLost();
 449   apps_grid_view_->EndDrag(true);
 450 #endif
 451 }
 452
 453 bool AppListItemView::OnMouseDragged(const ui::MouseEvent& event) {
 454   CustomButton::OnMouseDragged(event);
 455   if (apps_grid_view_->IsDraggedView(this)) {
 456     // If the drag is no longer happening, it could be because this item
 457     // got removed, in which case this item has been destroyed. So, bail out
 458     // now as there will be nothing else to do anyway as
 459     // apps_grid_view_->dragging() will be false.
 460     if (!apps_grid_view_->UpdateDragFromItem(AppsGridView::MOUSE, event))
 461       return true;
 462   }
 463
 464   // Shows dragging UI when it's confirmed without waiting for the timer.
 465   if (ui_state_ != UI_STATE_DRAGGING &&
 466       apps_grid_view_->dragging() &&
 467       apps_grid_view_->IsDraggedView(this)) {
 468     mouse_drag_timer_.Stop();
 469     SetUIState(UI_STATE_DRAGGING);
 470   }
 471   return true;
 472 }
 473
 474 void AppListItemView::OnGestureEvent(ui::GestureEvent* event) {
 475   switch (event->type()) {
 476     case ui::ET_GESTURE_SCROLL_BEGIN:
 477       if (touch_dragging_) {
 478         apps_grid_view_->InitiateDrag(this, AppsGridView::TOUCH, *event);
 479         event->SetHandled();
 480       }
 481       break;
 482     case ui::ET_GESTURE_SCROLL_UPDATE:
 483       if (touch_dragging_ && apps_grid_view_->IsDraggedView(this)) {
 484         apps_grid_view_->UpdateDragFromItem(AppsGridView::TOUCH, *event);
 485         event->SetHandled();
 486       }
 487       break;
 488     case ui::ET_GESTURE_SCROLL_END:
 489     case ui::ET_SCROLL_FLING_START:
 490       if (touch_dragging_) {
 491         SetTouchDragging(false);
 492         apps_grid_view_->EndDrag(false);
 493         event->SetHandled();
 494       }
 495       break;
 496     case ui::ET_GESTURE_LONG_PRESS:
 497       if (!apps_grid_view_->has_dragged_view())
 498         SetTouchDragging(true);
 499       event->SetHandled();
 500       break;
 501     case ui::ET_GESTURE_LONG_TAP:
 502     case ui::ET_GESTURE_END:
 503       if (touch_dragging_)
 504         SetTouchDragging(false);
 505       break;
 506     default:
 507       break;
 508   }
 509   if (!event->handled())
 510     CustomButton::OnGestureEvent(event);
 511 }
 512
 513 void AppListItemView::OnSyncDragEnd() {
 514   SetUIState(UI_STATE_NORMAL);
 515 }
 516
 517 const gfx::Rect& AppListItemView::GetIconBounds() const {
 518   return icon_->bounds();
 519 }
 520
 521 void AppListItemView::SetDragUIState() {
 522   SetUIState(UI_STATE_DRAGGING);
 523 }
 524
 525 gfx::Rect AppListItemView::GetIconBoundsForTargetViewBounds(
 526     const gfx::Rect& target_bounds) {
 527   gfx::Rect rect(target_bounds);
 528
 529   const int left_right_padding =
 530       title_->font_list().GetExpectedTextWidth(kLeftRightPaddingChars);
 531   rect.Inset(left_right_padding, kTopPadding, left_right_padding, 0);
 532
 533   gfx::Rect icon_bounds(rect.x(), rect.y(), rect.width(), icon_size_.height());
 534   icon_bounds.Inset(gfx::ShadowValue::GetMargin(icon_shadows_));
 535   return icon_bounds;
 536 }
 537
 538 }  // namespace app_list