app_list: Moved FolderImageSource into folder_image.cc.

ui/app_list/folder_image.cc

Index: ui/app_list/folder_image.cc
diff --git a/ui/app_list/folder_image.cc b/ui/app_list/folder_image.cc
index 515db07d46cd8601ba0b0115f34154f259aac8c3..c6ea1fe1b877559284d254e45c78c18a5aa42174 100644
--- a/ui/app_list/folder_image.cc
+++ b/ui/app_list/folder_image.cc
@@ -4,17 +4,111 @@
 
 #include "ui/app_list/folder_image.h"
 
+#include <vector>
+
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_item_list.h"
-#include "ui/app_list/folder_image_source.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/image/canvas_image_source.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_skia_operations.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace app_list {
 
+namespace {
+
+const int kItemIconDimension = 16;
+
+// Gets the size of a small app icon inside the folder icon.
+gfx::Size ItemIconSize() {
+  return gfx::Size(kItemIconDimension, kItemIconDimension);
+}
+
+// Generates the folder icon with the top 4 child item icons laid in 2x2 tile.
+class FolderImageSource : public gfx::CanvasImageSource {
+ public:
+  typedef std::vector<gfx::ImageSkia> Icons;
+
+  FolderImageSource(const Icons& icons, const gfx::Size& size);
+  ~FolderImageSource() override;
+
+ private:
+  void DrawIcon(gfx::Canvas* canvas,
+                const gfx::ImageSkia& icon,
+                const gfx::Size icon_size,
+                int x,
+                int y);
+
+  // gfx::CanvasImageSource overrides:
+  void Draw(gfx::Canvas* canvas) override;
+
+  Icons icons_;
+  gfx::Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(FolderImageSource);
+};
+
+FolderImageSource::FolderImageSource(const Icons& icons, const gfx::Size& size)
+    : gfx::CanvasImageSource(size, false), icons_(icons), size_(size) {
+  DCHECK(icons.size() <= kNumFolderTopItems);
+}
+
+FolderImageSource::~FolderImageSource() {
+}
+
+void FolderImageSource::DrawIcon(gfx::Canvas* canvas,
+                                 const gfx::ImageSkia& icon,
+                                 const gfx::Size icon_size,
+                                 int x,
+                                 int y) {
+  if (icon.isNull())
+    return;
+
+  gfx::ImageSkia resized(gfx::ImageSkiaOperations::CreateResizedImage(
+      icon, skia::ImageOperations::RESIZE_BEST, icon_size));
+  canvas->DrawImageInt(resized, 0, 0, resized.width(), resized.height(), x, y,
+                       resized.width(), resized.height(), true);
+}
+
+void FolderImageSource::Draw(gfx::Canvas* canvas) {
+  // Draw circle for folder shadow.
+  gfx::PointF shadow_center(size().width() / 2, size().height() / 2);
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setAntiAlias(true);
+  paint.setColor(kFolderShadowColor);
+  canvas->sk_canvas()->drawCircle(shadow_center.x(), shadow_center.y(),
+                                  kFolderShadowRadius, paint);
+  // Draw circle for folder bubble.
+  gfx::PointF bubble_center(shadow_center);
+  bubble_center.Offset(0, -kFolderShadowOffsetY);
+  paint.setColor(kFolderBubbleColor);
+  canvas->sk_canvas()->drawCircle(bubble_center.x(), bubble_center.y(),
+                                  kFolderBubbleRadius, paint);
+
+  if (icons_.size() == 0)
+    return;
+
+  // Draw top items' icons.
+  const gfx::Size item_icon_size(ItemIconSize());
+  std::vector<gfx::Rect> top_icon_bounds =
+      FolderImage::GetTopIconsBounds(gfx::Rect(size()));
+
+  for (size_t i = 0; i < kNumFolderTopItems && i < icons_.size(); ++i) {
+    DrawIcon(canvas, icons_[i], item_icon_size, top_icon_bounds[i].x(),
+             top_icon_bounds[i].y());
+  }
+}
+
+}  // namespace
+
 FolderImage::FolderImage(AppListItemList* item_list) : item_list_(item_list) {
   item_list_->AddObserver(this);
 }
@@ -44,19 +138,50 @@ const gfx::ImageSkia& FolderImage::GetTopIcon(size_t item_index) {
   return top_items_[item_index]->icon();
 }
 
+// static
+std::vector<gfx::Rect> FolderImage::GetTopIconsBounds(
+    const gfx::Rect& folder_icon_bounds) {
+  const int delta_to_center = 1;
+  gfx::Point icon_center = folder_icon_bounds.CenterPoint();
+  std::vector<gfx::Rect> top_icon_bounds;
+
+  // Get the top left icon bounds.
+  int left_x = icon_center.x() - kItemIconDimension - delta_to_center;
+  int top_y = icon_center.y() - kItemIconDimension - delta_to_center;
+  gfx::Rect top_left(left_x, top_y, kItemIconDimension, kItemIconDimension);
+  top_icon_bounds.push_back(top_left);
+
+  // Get the top right icon bounds.
+  int right_x = icon_center.x() + delta_to_center;
+  gfx::Rect top_right(right_x, top_y, kItemIconDimension, kItemIconDimension);
+  top_icon_bounds.push_back(top_right);
+
+  // Get the bottom left icon bounds.
+  int bottom_y = icon_center.y() + delta_to_center;
+  gfx::Rect bottom_left(left_x, bottom_y, kItemIconDimension,
+                        kItemIconDimension);
+  top_icon_bounds.push_back(bottom_left);
+
+  // Get the bottom right icon bounds.
+  gfx::Rect bottom_right(right_x, bottom_y, kItemIconDimension,
+                         kItemIconDimension);
+  top_icon_bounds.push_back(bottom_right);
+
+  return top_icon_bounds;
+}
+
 gfx::Rect FolderImage::GetTargetIconRectInFolderForItem(
     AppListItem* item,
     const gfx::Rect& folder_icon_bounds) {
   for (size_t i = 0; i < top_items_.size(); ++i) {
     if (item->id() == top_items_[i]->id()) {
-      std::vector<gfx::Rect> rects =
-          FolderImageSource::GetTopIconsBounds(folder_icon_bounds);
+      std::vector<gfx::Rect> rects = GetTopIconsBounds(folder_icon_bounds);
       return rects[i];
     }
   }
 
   gfx::Rect target_rect(folder_icon_bounds);
-  target_rect.ClampToCenteredSize(FolderImageSource::ItemIconSize());
+  target_rect.ClampToCenteredSize(ItemIconSize());
   return target_rect;
 }