text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "chrome/browser/extensions/extension_uninstall_dialog.h"
  
  #include "base/logging.h"
  #include "base/message_loop.h"
  #include "chrome/common/chrome_notification_types.h"
  #include "chrome/common/extensions/extension.h"
  #include "chrome/common/extensions/extension_constants.h"
  #include "chrome/common/extensions/extension_icon_set.h"
  #include "chrome/common/extensions/extension_resource.h"
  #include "content/public/browser/notification_service.h"
  #include "content/public/browser/notification_source.h"
  #include "grit/generated_resources.h"
  #include "grit/theme_resources.h"
  #include "ui/base/resource/resource_bundle.h"
  #include "ui/gfx/image/image.h"
  
  namespace {
  
  // Returns pixel size under maximal scale factor for the icon whose device
  // independent size is |size_in_dip|
  int GetSizeForMaxScaleFactor(int size_in_dip) {
    std::vector<ui::ScaleFactor> supported_scale_factors =
        ui::GetSupportedScaleFactors();
    // Scale factors are in ascending order, so the last one is the one we need.
    ui::ScaleFactor max_scale_factor = supported_scale_factors.back();
    float max_scale_factor_scale = ui::GetScaleFactorScale(max_scale_factor);
  
    return static_cast<int>(size_in_dip * max_scale_factor_scale);
  }
  
  // Returns bitmap for the default icon with size equal to the default icon's
  // pixel size under maximal supported scale factor.
  SkBitmap GetDefaultIconBitmapForMaxScaleFactor(bool is_app) {
    std::vector<ui::ScaleFactor> supported_scale_factors =
        ui::GetSupportedScaleFactors();
    // Scale factors are in ascending order, so the last one is the one we need.
    ui::ScaleFactor max_scale_factor =
        supported_scale_factors[supported_scale_factors.size() - 1];
  
    return extensions::Extension::GetDefaultIcon(is_app).
        GetRepresentation(max_scale_factor).sk_bitmap();
  }
  
  }  // namespace
  
  // Size of extension icon in top left of dialog.
  static const int kIconSize = 69;
  
  ExtensionUninstallDialog::ExtensionUninstallDialog(
      Browser* browser,
      ExtensionUninstallDialog::Delegate* delegate)
      : browser_(browser),
        delegate_(delegate),
        extension_(NULL),
        ui_loop_(MessageLoop::current()) {
    if (browser) {
      registrar_.Add(this,
                     chrome::NOTIFICATION_BROWSER_CLOSING,
                     content::Source<Browser>(browser));
    }
  }
  
  ExtensionUninstallDialog::~ExtensionUninstallDialog() {
  }
  
  void ExtensionUninstallDialog::ConfirmUninstall(
      const extensions::Extension* extension) {
    DCHECK(ui_loop_ == MessageLoop::current());
    extension_ = extension;
  
    ExtensionResource image =
        extension_->GetIconResource(extension_misc::EXTENSION_ICON_LARGE,
                                    ExtensionIconSet::MATCH_BIGGER);
    // Load the image asynchronously. The response will be sent to OnImageLoaded.
    tracker_.reset(new ImageLoadingTracker(this));
    // Load the icon whose pixel size is large enough to be displayed under
    // maximal supported scale factor. UI code will scale the icon down if needed.
    int pixel_size = GetSizeForMaxScaleFactor(kIconSize);
    tracker_->LoadImage(extension_, image,
                        gfx::Size(pixel_size, pixel_size),
                        ImageLoadingTracker::DONT_CACHE);
  }
  
  void ExtensionUninstallDialog::SetIcon(const gfx::Image& image) {
    if (image.IsEmpty()) {
      // Let's set default icon bitmap whose size is equal to the default icon's
      // pixel size under maximal supported scale factor. If the bitmap is larger
      // than the one we need, it will be scaled down by the ui code.
      // TODO(tbarzic): We should use IconImage here and load the required bitmap
      //     lazily.
      icon_ = GetDefaultIconBitmapForMaxScaleFactor(extension_->is_app());
    } else {
      icon_ = *image.ToImageSkia();
    }
  }
  
  void ExtensionUninstallDialog::OnImageLoaded(const gfx::Image& image,
                                               const std::string& extension_id,
                                               int index) {
    SetIcon(image);
  
    // Reset the tracker so that we can use its presence as a signal that we're
    // still waiting for the icon to load.
    tracker_.reset();
  
    Show();
  }
  
  void ExtensionUninstallDialog::Observe(
      int type,
      const content::NotificationSource& source,
      const content::NotificationDetails& details) {
    DCHECK(type == chrome::NOTIFICATION_BROWSER_CLOSING);
  
    browser_ = NULL;
    if (tracker_.get()) {
      // If we're waiting for the icon, stop doing so because we're not going to
      // show the dialog.
      tracker_.reset();
      delegate_->ExtensionUninstallCanceled();
    }
  }
  