src/chrome/browser/extensions/extension_view_host.cc

   1 // Copyright 2013 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_view_host.h"
   6
   7 #include "base/strings/string_piece.h"
   8 #include "chrome/browser/chrome_notification_types.h"
   9 #include "chrome/browser/extensions/extension_view.h"
  10 #include "chrome/browser/extensions/window_controller.h"
  11 #include "chrome/browser/file_select_helper.h"
  12 #include "chrome/browser/platform_util.h"
  13 #include "chrome/browser/ui/browser.h"
  14 #include "chrome/browser/ui/browser_dialogs.h"
  15 #include "components/web_modal/web_contents_modal_dialog_manager.h"
  16 #include "content/public/browser/notification_source.h"
  17 #include "content/public/browser/render_view_host.h"
  18 #include "content/public/browser/web_contents.h"
  19 #include "extensions/browser/extension_system.h"
  20 #include "extensions/browser/runtime_data.h"
  21 #include "extensions/common/extension_messages.h"
  22 #include "grit/browser_resources.h"
  23 #include "third_party/WebKit/public/web/WebInputEvent.h"
  24 #include "ui/base/resource/resource_bundle.h"
  25 #include "ui/events/keycodes/keyboard_codes.h"
  26
  27 using content::NativeWebKeyboardEvent;
  28 using content::OpenURLParams;
  29 using content::RenderViewHost;
  30 using content::WebContents;
  31 using content::WebContentsObserver;
  32 using web_modal::WebContentsModalDialogManager;
  33
  34 namespace extensions {
  35
  36 // Notifies an ExtensionViewHost when a WebContents is destroyed.
  37 class ExtensionViewHost::AssociatedWebContentsObserver
  38     : public WebContentsObserver {
  39  public:
  40   AssociatedWebContentsObserver(ExtensionViewHost* host,
  41                                 WebContents* web_contents)
  42       : WebContentsObserver(web_contents), host_(host) {}
  43   virtual ~AssociatedWebContentsObserver() {}
  44
  45   // content::WebContentsObserver:
  46   virtual void WebContentsDestroyed() OVERRIDE {
  47     // Deleting |this| from here is safe.
  48     host_->SetAssociatedWebContents(NULL);
  49   }
  50
  51  private:
  52   ExtensionViewHost* host_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(AssociatedWebContentsObserver);
  55 };
  56
  57 ExtensionViewHost::ExtensionViewHost(
  58     const Extension* extension,
  59     content::SiteInstance* site_instance,
  60     const GURL& url,
  61     ViewType host_type)
  62     : ExtensionHost(extension, site_instance, url, host_type),
  63       associated_web_contents_(NULL) {
  64   // Not used for panels, see PanelHost.
  65   DCHECK(host_type == VIEW_TYPE_EXTENSION_DIALOG ||
  66          host_type == VIEW_TYPE_EXTENSION_INFOBAR ||
  67          host_type == VIEW_TYPE_EXTENSION_POPUP);
  68 }
  69
  70 ExtensionViewHost::~ExtensionViewHost() {
  71   // The hosting WebContents will be deleted in the base class, so unregister
  72   // this object before it deletes the attached WebContentsModalDialogManager.
  73   WebContentsModalDialogManager* manager =
  74       WebContentsModalDialogManager::FromWebContents(host_contents());
  75   if (manager)
  76     manager->SetDelegate(NULL);
  77 }
  78
  79 void ExtensionViewHost::CreateView(Browser* browser) {
  80   view_ = CreateExtensionView(this, browser);
  81   view_->Init();
  82 }
  83
  84 void ExtensionViewHost::SetAssociatedWebContents(WebContents* web_contents) {
  85   associated_web_contents_ = web_contents;
  86   if (associated_web_contents_) {
  87     // Observe the new WebContents for deletion.
  88     associated_web_contents_observer_.reset(
  89         new AssociatedWebContentsObserver(this, associated_web_contents_));
  90   } else {
  91     associated_web_contents_observer_.reset();
  92   }
  93 }
  94
  95 void ExtensionViewHost::UnhandledKeyboardEvent(
  96     WebContents* source,
  97     const content::NativeWebKeyboardEvent& event) {
  98   view_->HandleKeyboardEvent(source, event);
  99 }
 100
 101 // ExtensionHost overrides:
 102
 103 void ExtensionViewHost::OnDidStopLoading() {
 104   DCHECK(did_stop_loading());
 105   view_->DidStopLoading();
 106 }
 107
 108 void ExtensionViewHost::OnDocumentAvailable() {
 109   if (extension_host_type() == VIEW_TYPE_EXTENSION_INFOBAR) {
 110     // No style sheet for other types, at the moment.
 111     InsertInfobarCSS();
 112   }
 113 }
 114
 115 void ExtensionViewHost::LoadInitialURL() {
 116   if (!ExtensionSystem::Get(browser_context())->
 117           runtime_data()->IsBackgroundPageReady(extension())) {
 118     // Make sure the background page loads before any others.
 119     registrar()->Add(this,
 120                      extensions::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY,
 121                      content::Source<Extension>(extension()));
 122     return;
 123   }
 124
 125   // Popups may spawn modal dialogs, which need positioning information.
 126   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
 127     WebContentsModalDialogManager::CreateForWebContents(host_contents());
 128     WebContentsModalDialogManager::FromWebContents(
 129         host_contents())->SetDelegate(this);
 130     if (!popup_manager_.get())
 131       popup_manager_.reset(new web_modal::PopupManager(this));
 132     popup_manager_->RegisterWith(host_contents());
 133   }
 134
 135   ExtensionHost::LoadInitialURL();
 136 }
 137
 138 bool ExtensionViewHost::IsBackgroundPage() const {
 139   DCHECK(view_);
 140   return false;
 141 }
 142
 143 // content::WebContentsDelegate overrides:
 144
 145 WebContents* ExtensionViewHost::OpenURLFromTab(
 146     WebContents* source,
 147     const OpenURLParams& params) {
 148   // Whitelist the dispositions we will allow to be opened.
 149   switch (params.disposition) {
 150     case SINGLETON_TAB:
 151     case NEW_FOREGROUND_TAB:
 152     case NEW_BACKGROUND_TAB:
 153     case NEW_POPUP:
 154     case NEW_WINDOW:
 155     case SAVE_TO_DISK:
 156     case OFF_THE_RECORD: {
 157       // Only allow these from hosts that are bound to a browser (e.g. popups).
 158       // Otherwise they are not driven by a user gesture.
 159       Browser* browser = view_->GetBrowser();
 160       return browser ? browser->OpenURL(params) : NULL;
 161     }
 162     default:
 163       return NULL;
 164   }
 165 }
 166
 167 bool ExtensionViewHost::PreHandleKeyboardEvent(
 168     WebContents* source,
 169     const NativeWebKeyboardEvent& event,
 170     bool* is_keyboard_shortcut) {
 171   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP &&
 172       event.type == NativeWebKeyboardEvent::RawKeyDown &&
 173       event.windowsKeyCode == ui::VKEY_ESCAPE) {
 174     DCHECK(is_keyboard_shortcut != NULL);
 175     *is_keyboard_shortcut = true;
 176     return false;
 177   }
 178
 179   // Handle higher priority browser shortcuts such as Ctrl-w.
 180   Browser* browser = view_->GetBrowser();
 181   if (browser)
 182     return browser->PreHandleKeyboardEvent(source, event, is_keyboard_shortcut);
 183
 184   *is_keyboard_shortcut = false;
 185   return false;
 186 }
 187
 188 void ExtensionViewHost::HandleKeyboardEvent(
 189     WebContents* source,
 190     const NativeWebKeyboardEvent& event) {
 191   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
 192     if (event.type == NativeWebKeyboardEvent::RawKeyDown &&
 193         event.windowsKeyCode == ui::VKEY_ESCAPE) {
 194       Close();
 195       return;
 196     }
 197   }
 198   UnhandledKeyboardEvent(source, event);
 199 }
 200
 201 bool ExtensionViewHost::PreHandleGestureEvent(
 202     content::WebContents* source,
 203     const blink::WebGestureEvent& event) {
 204   // Disable pinch zooming.
 205   return event.type == blink::WebGestureEvent::GesturePinchBegin ||
 206       event.type == blink::WebGestureEvent::GesturePinchUpdate ||
 207       event.type == blink::WebGestureEvent::GesturePinchEnd;
 208 }
 209
 210 content::ColorChooser* ExtensionViewHost::OpenColorChooser(
 211     WebContents* web_contents,
 212     SkColor initial_color,
 213     const std::vector<content::ColorSuggestion>& suggestions) {
 214   // Similar to the file chooser below, opening a color chooser requires a
 215   // visible <input> element to click on. Therefore this code only exists for
 216   // extensions with a view.
 217   return chrome::ShowColorChooser(web_contents, initial_color);
 218 }
 219
 220 void ExtensionViewHost::RunFileChooser(
 221     WebContents* tab,
 222     const content::FileChooserParams& params) {
 223   // For security reasons opening a file picker requires a visible <input>
 224   // element to click on, so this code only exists for extensions with a view.
 225   FileSelectHelper::RunFileChooser(tab, params);
 226 }
 227
 228
 229 void ExtensionViewHost::ResizeDueToAutoResize(WebContents* source,
 230                                           const gfx::Size& new_size) {
 231   view_->ResizeDueToAutoResize(new_size);
 232 }
 233
 234 // content::WebContentsObserver overrides:
 235
 236 void ExtensionViewHost::RenderViewCreated(RenderViewHost* render_view_host) {
 237   ExtensionHost::RenderViewCreated(render_view_host);
 238
 239   view_->RenderViewCreated();
 240
 241   // If the host is bound to a window, then extract its id. Extensions hosted
 242   // in ExternalTabContainer objects may not have an associated window.
 243   WindowController* window = GetExtensionWindowController();
 244   if (window) {
 245     render_view_host->Send(new ExtensionMsg_UpdateBrowserWindowId(
 246         render_view_host->GetRoutingID(), window->GetWindowId()));
 247   }
 248 }
 249
 250 // web_modal::WebContentsModalDialogManagerDelegate overrides:
 251
 252 web_modal::WebContentsModalDialogHost*
 253 ExtensionViewHost::GetWebContentsModalDialogHost() {
 254   return this;
 255 }
 256
 257 bool ExtensionViewHost::IsWebContentsVisible(WebContents* web_contents) {
 258   return platform_util::IsVisible(web_contents->GetNativeView());
 259 }
 260
 261 gfx::NativeView ExtensionViewHost::GetHostView() const {
 262   return view_->GetNativeView();
 263 }
 264
 265 gfx::Point ExtensionViewHost::GetDialogPosition(const gfx::Size& size) {
 266   if (!GetVisibleWebContents())
 267     return gfx::Point();
 268   gfx::Rect bounds = GetVisibleWebContents()->GetViewBounds();
 269   return gfx::Point(
 270       std::max(0, (bounds.width() - size.width()) / 2),
 271       std::max(0, (bounds.height() - size.height()) / 2));
 272 }
 273
 274 gfx::Size ExtensionViewHost::GetMaximumDialogSize() {
 275   if (!GetVisibleWebContents())
 276     return gfx::Size();
 277   return GetVisibleWebContents()->GetViewBounds().size();
 278 }
 279
 280 void ExtensionViewHost::AddObserver(
 281     web_modal::ModalDialogHostObserver* observer) {
 282 }
 283
 284 void ExtensionViewHost::RemoveObserver(
 285     web_modal::ModalDialogHostObserver* observer) {
 286 }
 287
 288 WindowController* ExtensionViewHost::GetExtensionWindowController() const {
 289   Browser* browser = view_->GetBrowser();
 290   return browser ? browser->extension_window_controller() : NULL;
 291 }
 292
 293 WebContents* ExtensionViewHost::GetAssociatedWebContents() const {
 294   return associated_web_contents_;
 295 }
 296
 297 WebContents* ExtensionViewHost::GetVisibleWebContents() const {
 298   if (associated_web_contents_)
 299     return associated_web_contents_;
 300   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP)
 301     return host_contents();
 302   return NULL;
 303 }
 304
 305 void ExtensionViewHost::Observe(int type,
 306                                 const content::NotificationSource& source,
 307                                 const content::NotificationDetails& details) {
 308   if (type == extensions::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY) {
 309     DCHECK(ExtensionSystem::Get(browser_context())->
 310                runtime_data()->IsBackgroundPageReady(extension()));
 311     LoadInitialURL();
 312     return;
 313   }
 314   ExtensionHost::Observe(type, source, details);
 315 }
 316
 317 void ExtensionViewHost::InsertInfobarCSS() {
 318   static const base::StringPiece css(
 319       ResourceBundle::GetSharedInstance().GetRawDataResource(
 320       IDR_EXTENSIONS_INFOBAR_CSS));
 321
 322   host_contents()->InsertCSS(css.as_string());
 323 }
 324
 325 }  // namespace extensions