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/window_controller.h"
  10 #include "chrome/browser/file_select_helper.h"
  11 #include "chrome/browser/platform_util.h"
  12 #include "chrome/browser/ui/browser.h"
  13 #include "chrome/browser/ui/browser_dialogs.h"
  14 #include "components/web_modal/web_contents_modal_dialog_manager.h"
  15 #include "content/public/browser/notification_source.h"
  16 #include "content/public/browser/render_view_host.h"
  17 #include "content/public/browser/web_contents.h"
  18 #include "extensions/browser/extension_system.h"
  19 #include "extensions/browser/runtime_data.h"
  20 #include "extensions/common/extension_messages.h"
  21 #include "grit/browser_resources.h"
  22 #include "third_party/WebKit/public/web/WebInputEvent.h"
  23 #include "ui/base/resource/resource_bundle.h"
  24 #include "ui/events/keycodes/keyboard_codes.h"
  25
  26 using content::NativeWebKeyboardEvent;
  27 using content::OpenURLParams;
  28 using content::RenderViewHost;
  29 using content::WebContents;
  30 using content::WebContentsObserver;
  31 using web_modal::WebContentsModalDialogManager;
  32
  33 namespace extensions {
  34
  35 // Notifies an ExtensionViewHost when a WebContents is destroyed.
  36 class ExtensionViewHost::AssociatedWebContentsObserver
  37     : public WebContentsObserver {
  38  public:
  39   AssociatedWebContentsObserver(ExtensionViewHost* host,
  40                                 WebContents* web_contents)
  41       : WebContentsObserver(web_contents), host_(host) {}
  42   virtual ~AssociatedWebContentsObserver() {}
  43
  44   // content::WebContentsObserver:
  45   virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE {
  46     // Deleting |this| from here is safe.
  47     host_->SetAssociatedWebContents(NULL);
  48   }
  49
  50  private:
  51   ExtensionViewHost* host_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(AssociatedWebContentsObserver);
  54 };
  55
  56 ExtensionViewHost::ExtensionViewHost(
  57     const Extension* extension,
  58     content::SiteInstance* site_instance,
  59     const GURL& url,
  60     ViewType host_type)
  61     : ExtensionHost(extension, site_instance, url, host_type),
  62       associated_web_contents_(NULL) {
  63   // Not used for panels, see PanelHost.
  64   DCHECK(host_type == VIEW_TYPE_EXTENSION_DIALOG ||
  65          host_type == VIEW_TYPE_EXTENSION_INFOBAR ||
  66          host_type == VIEW_TYPE_EXTENSION_POPUP);
  67 }
  68
  69 ExtensionViewHost::~ExtensionViewHost() {
  70   // The hosting WebContents will be deleted in the base class, so unregister
  71   // this object before it deletes the attached WebContentsModalDialogManager.
  72   WebContentsModalDialogManager* manager =
  73       WebContentsModalDialogManager::FromWebContents(host_contents());
  74   if (manager)
  75     manager->SetDelegate(NULL);
  76 }
  77
  78 void ExtensionViewHost::CreateView(Browser* browser) {
  79 #if defined(TOOLKIT_VIEWS)
  80   view_.reset(new ExtensionViewViews(this, browser));
  81   // We own |view_|, so don't auto delete when it's removed from the view
  82   // hierarchy.
  83   view_->set_owned_by_client();
  84 #elif defined(OS_MACOSX)
  85   view_.reset(new ExtensionViewMac(this, browser));
  86   view_->Init();
  87 #else
  88   // TODO(port)
  89   NOTREACHED();
  90 #endif
  91 }
  92
  93 void ExtensionViewHost::SetAssociatedWebContents(WebContents* web_contents) {
  94   associated_web_contents_ = web_contents;
  95   if (associated_web_contents_) {
  96     // Observe the new WebContents for deletion.
  97     associated_web_contents_observer_.reset(
  98         new AssociatedWebContentsObserver(this, associated_web_contents_));
  99   } else {
 100     associated_web_contents_observer_.reset();
 101   }
 102 }
 103
 104 void ExtensionViewHost::UnhandledKeyboardEvent(
 105     WebContents* source,
 106     const content::NativeWebKeyboardEvent& event) {
 107   Browser* browser = view_->browser();
 108   if (browser) {
 109     // Handle lower priority browser shortcuts such as Ctrl-f.
 110     return browser->HandleKeyboardEvent(source, event);
 111   } else {
 112 #if defined(TOOLKIT_VIEWS)
 113     // In case there's no Browser (e.g. for dialogs), pass it to
 114     // ExtensionViewViews to handle accelerators. The view's FocusManager does
 115     // not know anything about Browser accelerators, but might know others such
 116     // as Ash's.
 117     view_->HandleKeyboardEvent(event);
 118 #endif
 119   }
 120 }
 121
 122 // ExtensionHost overrides:
 123
 124 void ExtensionViewHost::OnDidStopLoading() {
 125   DCHECK(did_stop_loading());
 126 #if defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
 127   view_->DidStopLoading();
 128 #endif
 129 }
 130
 131 void ExtensionViewHost::OnDocumentAvailable() {
 132   if (extension_host_type() == VIEW_TYPE_EXTENSION_INFOBAR) {
 133     // No style sheet for other types, at the moment.
 134     InsertInfobarCSS();
 135   }
 136 }
 137
 138 void ExtensionViewHost::LoadInitialURL() {
 139   if (!ExtensionSystem::Get(browser_context())->
 140           runtime_data()->IsBackgroundPageReady(extension())) {
 141     // Make sure the background page loads before any others.
 142     registrar()->Add(this,
 143                      chrome::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY,
 144                      content::Source<Extension>(extension()));
 145     return;
 146   }
 147
 148   // Popups may spawn modal dialogs, which need positioning information.
 149   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
 150     WebContentsModalDialogManager::CreateForWebContents(host_contents());
 151     WebContentsModalDialogManager::FromWebContents(
 152         host_contents())->SetDelegate(this);
 153   }
 154
 155   ExtensionHost::LoadInitialURL();
 156 }
 157
 158 bool ExtensionViewHost::IsBackgroundPage() const {
 159   DCHECK(view_);
 160   return false;
 161 }
 162
 163 // content::WebContentsDelegate overrides:
 164
 165 WebContents* ExtensionViewHost::OpenURLFromTab(
 166     WebContents* source,
 167     const OpenURLParams& params) {
 168   // Whitelist the dispositions we will allow to be opened.
 169   switch (params.disposition) {
 170     case SINGLETON_TAB:
 171     case NEW_FOREGROUND_TAB:
 172     case NEW_BACKGROUND_TAB:
 173     case NEW_POPUP:
 174     case NEW_WINDOW:
 175     case SAVE_TO_DISK:
 176     case OFF_THE_RECORD: {
 177       // Only allow these from hosts that are bound to a browser (e.g. popups).
 178       // Otherwise they are not driven by a user gesture.
 179       Browser* browser = view_->browser();
 180       return browser ? browser->OpenURL(params) : NULL;
 181     }
 182     default:
 183       return NULL;
 184   }
 185 }
 186
 187 bool ExtensionViewHost::PreHandleKeyboardEvent(
 188     WebContents* source,
 189     const NativeWebKeyboardEvent& event,
 190     bool* is_keyboard_shortcut) {
 191   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP &&
 192       event.type == NativeWebKeyboardEvent::RawKeyDown &&
 193       event.windowsKeyCode == ui::VKEY_ESCAPE) {
 194     DCHECK(is_keyboard_shortcut != NULL);
 195     *is_keyboard_shortcut = true;
 196     return false;
 197   }
 198
 199   // Handle higher priority browser shortcuts such as Ctrl-w.
 200   Browser* browser = view_->browser();
 201   if (browser)
 202     return browser->PreHandleKeyboardEvent(source, event, is_keyboard_shortcut);
 203
 204   *is_keyboard_shortcut = false;
 205   return false;
 206 }
 207
 208 void ExtensionViewHost::HandleKeyboardEvent(
 209     WebContents* source,
 210     const NativeWebKeyboardEvent& event) {
 211   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
 212     if (event.type == NativeWebKeyboardEvent::RawKeyDown &&
 213         event.windowsKeyCode == ui::VKEY_ESCAPE) {
 214       Close();
 215       return;
 216     }
 217   }
 218   UnhandledKeyboardEvent(source, event);
 219 }
 220
 221 bool ExtensionViewHost::PreHandleGestureEvent(
 222     content::WebContents* source,
 223     const blink::WebGestureEvent& event) {
 224   // Disable pinch zooming.
 225   return event.type == blink::WebGestureEvent::GesturePinchBegin ||
 226       event.type == blink::WebGestureEvent::GesturePinchUpdate ||
 227       event.type == blink::WebGestureEvent::GesturePinchEnd;
 228 }
 229
 230 content::ColorChooser* ExtensionViewHost::OpenColorChooser(
 231     WebContents* web_contents,
 232     SkColor initial_color,
 233     const std::vector<content::ColorSuggestion>& suggestions) {
 234   // Similar to the file chooser below, opening a color chooser requires a
 235   // visible <input> element to click on. Therefore this code only exists for
 236   // extensions with a view.
 237   return chrome::ShowColorChooser(web_contents, initial_color);
 238 }
 239
 240 void ExtensionViewHost::RunFileChooser(
 241     WebContents* tab,
 242     const content::FileChooserParams& params) {
 243   // For security reasons opening a file picker requires a visible <input>
 244   // element to click on, so this code only exists for extensions with a view.
 245   FileSelectHelper::RunFileChooser(tab, params);
 246 }
 247
 248
 249 void ExtensionViewHost::ResizeDueToAutoResize(WebContents* source,
 250                                           const gfx::Size& new_size) {
 251   view_->ResizeDueToAutoResize(new_size);
 252 }
 253
 254 // content::WebContentsObserver overrides:
 255
 256 void ExtensionViewHost::RenderViewCreated(RenderViewHost* render_view_host) {
 257   ExtensionHost::RenderViewCreated(render_view_host);
 258
 259   view_->RenderViewCreated();
 260
 261   // If the host is bound to a window, then extract its id. Extensions hosted
 262   // in ExternalTabContainer objects may not have an associated window.
 263   WindowController* window = GetExtensionWindowController();
 264   if (window) {
 265     render_view_host->Send(new ExtensionMsg_UpdateBrowserWindowId(
 266         render_view_host->GetRoutingID(), window->GetWindowId()));
 267   }
 268 }
 269
 270 // web_modal::WebContentsModalDialogManagerDelegate overrides:
 271
 272 web_modal::WebContentsModalDialogHost*
 273 ExtensionViewHost::GetWebContentsModalDialogHost() {
 274   return this;
 275 }
 276
 277 bool ExtensionViewHost::IsWebContentsVisible(WebContents* web_contents) {
 278   return platform_util::IsVisible(web_contents->GetNativeView());
 279 }
 280
 281 gfx::NativeView ExtensionViewHost::GetHostView() const {
 282   return view_->native_view();
 283 }
 284
 285 gfx::Point ExtensionViewHost::GetDialogPosition(const gfx::Size& size) {
 286   if (!GetVisibleWebContents())
 287     return gfx::Point();
 288   gfx::Rect bounds = GetVisibleWebContents()->GetViewBounds();
 289   return gfx::Point(
 290       std::max(0, (bounds.width() - size.width()) / 2),
 291       std::max(0, (bounds.height() - size.height()) / 2));
 292 }
 293
 294 gfx::Size ExtensionViewHost::GetMaximumDialogSize() {
 295   if (!GetVisibleWebContents())
 296     return gfx::Size();
 297   return GetVisibleWebContents()->GetViewBounds().size();
 298 }
 299
 300 void ExtensionViewHost::AddObserver(
 301     web_modal::ModalDialogHostObserver* observer) {
 302 }
 303
 304 void ExtensionViewHost::RemoveObserver(
 305     web_modal::ModalDialogHostObserver* observer) {
 306 }
 307
 308 WindowController* ExtensionViewHost::GetExtensionWindowController() const {
 309   return view_->browser() ? view_->browser()->extension_window_controller()
 310                           : NULL;
 311 }
 312
 313 WebContents* ExtensionViewHost::GetAssociatedWebContents() const {
 314   return associated_web_contents_;
 315 }
 316
 317 WebContents* ExtensionViewHost::GetVisibleWebContents() const {
 318   if (associated_web_contents_)
 319     return associated_web_contents_;
 320   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP)
 321     return host_contents();
 322   return NULL;
 323 }
 324
 325 void ExtensionViewHost::Observe(int type,
 326                                 const content::NotificationSource& source,
 327                                 const content::NotificationDetails& details) {
 328   if (type == chrome::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY) {
 329     DCHECK(ExtensionSystem::Get(browser_context())->
 330                runtime_data()->IsBackgroundPageReady(extension()));
 331     LoadInitialURL();
 332     return;
 333   }
 334   ExtensionHost::Observe(type, source, details);
 335 }
 336
 337 void ExtensionViewHost::InsertInfobarCSS() {
 338   static const base::StringPiece css(
 339       ResourceBundle::GetSharedInstance().GetRawDataResource(
 340       IDR_EXTENSIONS_INFOBAR_CSS));
 341
 342   host_contents()->InsertCSS(css.as_string());
 343 }
 344
 345 }  // namespace extensions