chrome/browser/extensions/extension_uninstall_dialog.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 "chrome/browser/extensions/extension_uninstall_dialog.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "chrome/browser/chrome_notification_types.h"
  11 #include "chrome/browser/extensions/image_loader.h"
  12 #include "chrome/browser/profiles/profile.h"
  13 #include "chrome/browser/ui/browser.h"
  14 #include "chrome/common/extensions/extension.h"
  15 #include "chrome/common/extensions/extension_constants.h"
  16 #include "chrome/common/extensions/extension_icon_set.h"
  17 #include "chrome/common/extensions/manifest_handlers/icons_handler.h"
  18 #include "content/public/browser/notification_service.h"
  19 #include "content/public/browser/notification_source.h"
  20 #include "extensions/common/extension_resource.h"
  21 #include "grit/generated_resources.h"
  22 #include "grit/theme_resources.h"
  23 #include "ui/base/resource/resource_bundle.h"
  24 #include "ui/gfx/image/image.h"
  25 #include "ui/gfx/image/image_skia.h"
  26
  27 namespace {
  28
  29 // Returns pixel size under maximal scale factor for the icon whose device
  30 // independent size is |size_in_dip|
  31 int GetSizeForMaxScaleFactor(int size_in_dip) {
  32   float max_scale_factor_scale = gfx::ImageSkia::GetMaxSupportedScale();
  33
  34   return static_cast<int>(size_in_dip * max_scale_factor_scale);
  35 }
  36
  37 // Returns bitmap for the default icon with size equal to the default icon's
  38 // pixel size under maximal supported scale factor.
  39 SkBitmap GetDefaultIconBitmapForMaxScaleFactor(bool is_app) {
  40   const gfx::ImageSkia& image = is_app ?
  41       extensions::IconsInfo::GetDefaultAppIcon() :
  42       extensions::IconsInfo::GetDefaultExtensionIcon();
  43   return image.GetRepresentation(
  44       gfx::ImageSkia::GetMaxSupportedScale()).sk_bitmap();
  45 }
  46
  47 }  // namespace
  48
  49 // Size of extension icon in top left of dialog.
  50 static const int kIconSize = 69;
  51
  52 ExtensionUninstallDialog::ExtensionUninstallDialog(
  53     Profile* profile,
  54     Browser* browser,
  55     ExtensionUninstallDialog::Delegate* delegate)
  56     : profile_(profile),
  57       browser_(browser),
  58       delegate_(delegate),
  59       extension_(NULL),
  60       state_(kImageIsLoading),
  61       ui_loop_(base::MessageLoop::current()) {
  62   if (browser) {
  63     registrar_.Add(this,
  64                    chrome::NOTIFICATION_BROWSER_CLOSED,
  65                    content::Source<Browser>(browser));
  66   }
  67 }
  68
  69 ExtensionUninstallDialog::~ExtensionUninstallDialog() {
  70 }
  71
  72 void ExtensionUninstallDialog::ConfirmUninstall(
  73     const extensions::Extension* extension) {
  74   DCHECK(ui_loop_ == base::MessageLoop::current());
  75   extension_ = extension;
  76   extensions::ExtensionResource image = extensions::IconsInfo::GetIconResource(
  77       extension_,
  78       extension_misc::EXTENSION_ICON_LARGE,
  79       ExtensionIconSet::MATCH_BIGGER);
  80   // Load the icon whose pixel size is large enough to be displayed under
  81   // maximal supported scale factor. UI code will scale the icon down if needed.
  82   int pixel_size = GetSizeForMaxScaleFactor(kIconSize);
  83
  84   // Load the image asynchronously. The response will be sent to OnImageLoaded.
  85   state_ = kImageIsLoading;
  86   extensions::ImageLoader* loader =
  87       extensions::ImageLoader::Get(profile_);
  88   loader->LoadImageAsync(extension_, image,
  89                          gfx::Size(pixel_size, pixel_size),
  90                          base::Bind(&ExtensionUninstallDialog::OnImageLoaded,
  91                                     AsWeakPtr()));
  92 }
  93
  94 void ExtensionUninstallDialog::SetIcon(const gfx::Image& image) {
  95   if (image.IsEmpty()) {
  96     // Let's set default icon bitmap whose size is equal to the default icon's
  97     // pixel size under maximal supported scale factor. If the bitmap is larger
  98     // than the one we need, it will be scaled down by the ui code.
  99     // TODO(tbarzic): We should use IconImage here and load the required bitmap
 100     //     lazily.
 101     icon_ = gfx::ImageSkia::CreateFrom1xBitmap(
 102         GetDefaultIconBitmapForMaxScaleFactor(extension_->is_app()));
 103   } else {
 104     icon_ = *image.ToImageSkia();
 105   }
 106 }
 107
 108 void ExtensionUninstallDialog::OnImageLoaded(const gfx::Image& image) {
 109   SetIcon(image);
 110
 111   // Show the dialog unless the browser has been closed while we were waiting
 112   // for the image.
 113   DCHECK(state_ == kImageIsLoading || state_ == kBrowserIsClosing);
 114   if (state_ == kImageIsLoading) {
 115     state_ = kDialogIsShowing;
 116     Show();
 117   }
 118 }
 119
 120 void ExtensionUninstallDialog::Observe(
 121     int type,
 122     const content::NotificationSource& source,
 123     const content::NotificationDetails& details) {
 124   DCHECK(type == chrome::NOTIFICATION_BROWSER_CLOSED);
 125
 126   browser_ = NULL;
 127   // If the browser is closed while waiting for the image, we need to send a
 128   // "cancel" event here, because there will not be another opportunity to
 129   // notify the delegate of the cancellation as we won't open the dialog.
 130   if (state_ == kImageIsLoading) {
 131     state_ = kBrowserIsClosing;
 132     delegate_->ExtensionUninstallCanceled();
 133   }
 134 }