src/ui/app_list/folder_image.cc

   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 "ui/app_list/folder_image.h"
   6
   7 #include <vector>
   8
   9 #include "ui/app_list/app_list_constants.h"
  10 #include "ui/app_list/app_list_item.h"
  11 #include "ui/app_list/app_list_item_list.h"
  12 #include "ui/base/l10n/l10n_util.h"
  13 #include "ui/gfx/canvas.h"
  14 #include "ui/gfx/geometry/point.h"
  15 #include "ui/gfx/geometry/rect.h"
  16 #include "ui/gfx/geometry/size.h"
  17 #include "ui/gfx/image/canvas_image_source.h"
  18 #include "ui/gfx/image/image_skia.h"
  19 #include "ui/gfx/image/image_skia_operations.h"
  20 #include "ui/strings/grit/ui_strings.h"
  21
  22 namespace app_list {
  23
  24 namespace {
  25
  26 const int kItemIconDimension = 16;
  27
  28 // Gets the size of a small app icon inside the folder icon.
  29 gfx::Size ItemIconSize() {
  30   return gfx::Size(kItemIconDimension, kItemIconDimension);
  31 }
  32
  33 // Generates the folder icon with the top 4 child item icons laid in 2x2 tile.
  34 class FolderImageSource : public gfx::CanvasImageSource {
  35  public:
  36   typedef std::vector<gfx::ImageSkia> Icons;
  37
  38   FolderImageSource(const Icons& icons, const gfx::Size& size);
  39   ~FolderImageSource() override;
  40
  41  private:
  42   void DrawIcon(gfx::Canvas* canvas,
  43                 const gfx::ImageSkia& icon,
  44                 const gfx::Size icon_size,
  45                 int x,
  46                 int y);
  47
  48   // gfx::CanvasImageSource overrides:
  49   void Draw(gfx::Canvas* canvas) override;
  50
  51   Icons icons_;
  52   gfx::Size size_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(FolderImageSource);
  55 };
  56
  57 FolderImageSource::FolderImageSource(const Icons& icons, const gfx::Size& size)
  58     : gfx::CanvasImageSource(size, false), icons_(icons), size_(size) {
  59   DCHECK(icons.size() <= kNumFolderTopItems);
  60 }
  61
  62 FolderImageSource::~FolderImageSource() {
  63 }
  64
  65 void FolderImageSource::DrawIcon(gfx::Canvas* canvas,
  66                                  const gfx::ImageSkia& icon,
  67                                  const gfx::Size icon_size,
  68                                  int x,
  69                                  int y) {
  70   if (icon.isNull())
  71     return;
  72
  73   gfx::ImageSkia resized(gfx::ImageSkiaOperations::CreateResizedImage(
  74       icon, skia::ImageOperations::RESIZE_BEST, icon_size));
  75   canvas->DrawImageInt(resized, 0, 0, resized.width(), resized.height(), x, y,
  76                        resized.width(), resized.height(), true);
  77 }
  78
  79 void FolderImageSource::Draw(gfx::Canvas* canvas) {
  80   // Draw circle for folder shadow.
  81   gfx::PointF shadow_center(size().width() / 2, size().height() / 2);
  82   SkPaint paint;
  83   paint.setStyle(SkPaint::kFill_Style);
  84   paint.setAntiAlias(true);
  85   paint.setColor(kFolderShadowColor);
  86   canvas->sk_canvas()->drawCircle(shadow_center.x(), shadow_center.y(),
  87                                   kFolderShadowRadius, paint);
  88   // Draw circle for folder bubble.
  89   gfx::PointF bubble_center(shadow_center);
  90   bubble_center.Offset(0, -kFolderShadowOffsetY);
  91   paint.setColor(kFolderBubbleColor);
  92   canvas->sk_canvas()->drawCircle(bubble_center.x(), bubble_center.y(),
  93                                   kFolderBubbleRadius, paint);
  94
  95   if (icons_.size() == 0)
  96     return;
  97
  98   // Draw top items' icons.
  99   const gfx::Size item_icon_size(ItemIconSize());
 100   std::vector<gfx::Rect> top_icon_bounds =
 101       FolderImage::GetTopIconsBounds(gfx::Rect(size()));
 102
 103   for (size_t i = 0; i < kNumFolderTopItems && i < icons_.size(); ++i) {
 104     DrawIcon(canvas, icons_[i], item_icon_size, top_icon_bounds[i].x(),
 105              top_icon_bounds[i].y());
 106   }
 107 }
 108
 109 }  // namespace
 110
 111 FolderImage::FolderImage(AppListItemList* item_list) : item_list_(item_list) {
 112   item_list_->AddObserver(this);
 113 }
 114
 115 FolderImage::~FolderImage() {
 116   for (auto* item : top_items_)
 117     item->RemoveObserver(this);
 118   item_list_->RemoveObserver(this);
 119 }
 120
 121 void FolderImage::UpdateIcon() {
 122   for (auto* item : top_items_)
 123     item->RemoveObserver(this);
 124   top_items_.clear();
 125
 126   for (size_t i = 0; i < kNumFolderTopItems && i < item_list_->item_count();
 127        ++i) {
 128     AppListItem* item = item_list_->item_at(i);
 129     item->AddObserver(this);
 130     top_items_.push_back(item);
 131   }
 132   RedrawIconAndNotify();
 133 }
 134
 135 const gfx::ImageSkia& FolderImage::GetTopIcon(size_t item_index) {
 136   CHECK_LT(item_index, top_items_.size());
 137   return top_items_[item_index]->icon();
 138 }
 139
 140 // static
 141 std::vector<gfx::Rect> FolderImage::GetTopIconsBounds(
 142     const gfx::Rect& folder_icon_bounds) {
 143   const int delta_to_center = 1;
 144   gfx::Point icon_center = folder_icon_bounds.CenterPoint();
 145   std::vector<gfx::Rect> top_icon_bounds;
 146
 147   // Get the top left icon bounds.
 148   int left_x = icon_center.x() - kItemIconDimension - delta_to_center;
 149   int top_y = icon_center.y() - kItemIconDimension - delta_to_center;
 150   gfx::Rect top_left(left_x, top_y, kItemIconDimension, kItemIconDimension);
 151   top_icon_bounds.push_back(top_left);
 152
 153   // Get the top right icon bounds.
 154   int right_x = icon_center.x() + delta_to_center;
 155   gfx::Rect top_right(right_x, top_y, kItemIconDimension, kItemIconDimension);
 156   top_icon_bounds.push_back(top_right);
 157
 158   // Get the bottom left icon bounds.
 159   int bottom_y = icon_center.y() + delta_to_center;
 160   gfx::Rect bottom_left(left_x, bottom_y, kItemIconDimension,
 161                         kItemIconDimension);
 162   top_icon_bounds.push_back(bottom_left);
 163
 164   // Get the bottom right icon bounds.
 165   gfx::Rect bottom_right(right_x, bottom_y, kItemIconDimension,
 166                          kItemIconDimension);
 167   top_icon_bounds.push_back(bottom_right);
 168
 169   return top_icon_bounds;
 170 }
 171
 172 gfx::Rect FolderImage::GetTargetIconRectInFolderForItem(
 173     AppListItem* item,
 174     const gfx::Rect& folder_icon_bounds) {
 175   for (size_t i = 0; i < top_items_.size(); ++i) {
 176     if (item->id() == top_items_[i]->id()) {
 177       std::vector<gfx::Rect> rects = GetTopIconsBounds(folder_icon_bounds);
 178       return rects[i];
 179     }
 180   }
 181
 182   gfx::Rect target_rect(folder_icon_bounds);
 183   target_rect.ClampToCenteredSize(ItemIconSize());
 184   return target_rect;
 185 }
 186
 187 void FolderImage::AddObserver(FolderImageObserver* observer) {
 188   observers_.AddObserver(observer);
 189 }
 190
 191 void FolderImage::RemoveObserver(FolderImageObserver* observer) {
 192   observers_.RemoveObserver(observer);
 193 }
 194
 195 void FolderImage::ItemIconChanged() {
 196   // Note: Must update the image only (cannot simply call UpdateIcon), because
 197   // UpdateIcon removes and re-adds the FolderImage as an observer of the
 198   // AppListItems, which causes the current iterator to call ItemIconChanged
 199   // again, and goes into an infinite loop.
 200   RedrawIconAndNotify();
 201 }
 202
 203 void FolderImage::OnListItemAdded(size_t index, AppListItem* item) {
 204   if (index < kNumFolderTopItems)
 205     UpdateIcon();
 206 }
 207
 208 void FolderImage::OnListItemRemoved(size_t index, AppListItem* item) {
 209   if (index < kNumFolderTopItems)
 210     UpdateIcon();
 211 }
 212
 213 void FolderImage::OnListItemMoved(size_t from_index,
 214                                   size_t to_index,
 215                                   AppListItem* item) {
 216   if (from_index < kNumFolderTopItems || to_index < kNumFolderTopItems)
 217     UpdateIcon();
 218 }
 219
 220 void FolderImage::RedrawIconAndNotify() {
 221   FolderImageSource::Icons top_icons;
 222   for (const auto* item : top_items_)
 223     top_icons.push_back(item->icon());
 224
 225   const gfx::Size icon_size = gfx::Size(kGridIconDimension, kGridIconDimension);
 226   icon_ =
 227       gfx::ImageSkia(new FolderImageSource(top_icons, icon_size), icon_size);
 228
 229   FOR_EACH_OBSERVER(FolderImageObserver, observers_, OnFolderImageUpdated());
 230 }
 231
 232 }  // namespace app_list