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   }
 131
 132   ExtensionHost::LoadInitialURL();
 133 }
 134
 135 bool ExtensionViewHost::IsBackgroundPage() const {
 136   DCHECK(view_);
 137   return false;
 138 }
 139
 140 // content::WebContentsDelegate overrides:
 141
 142 WebContents* ExtensionViewHost::OpenURLFromTab(
 143     WebContents* source,
 144     const OpenURLParams& params) {
 145   // Whitelist the dispositions we will allow to be opened.
 146   switch (params.disposition) {
 147     case SINGLETON_TAB:
 148     case NEW_FOREGROUND_TAB:
 149     case NEW_BACKGROUND_TAB:
 150     case NEW_POPUP:
 151     case NEW_WINDOW:
 152     case SAVE_TO_DISK:
 153     case OFF_THE_RECORD: {
 154       // Only allow these from hosts that are bound to a browser (e.g. popups).
 155       // Otherwise they are not driven by a user gesture.
 156       Browser* browser = view_->GetBrowser();
 157       return browser ? browser->OpenURL(params) : NULL;
 158     }
 159     default:
 160       return NULL;
 161   }
 162 }
 163
 164 bool ExtensionViewHost::PreHandleKeyboardEvent(
 165     WebContents* source,
 166     const NativeWebKeyboardEvent& event,
 167     bool* is_keyboard_shortcut) {
 168   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP &&
 169       event.type == NativeWebKeyboardEvent::RawKeyDown &&
 170       event.windowsKeyCode == ui::VKEY_ESCAPE) {
 171     DCHECK(is_keyboard_shortcut != NULL);
 172     *is_keyboard_shortcut = true;
 173     return false;
 174   }
 175
 176   // Handle higher priority browser shortcuts such as Ctrl-w.
 177   Browser* browser = view_->GetBrowser();
 178   if (browser)
 179     return browser->PreHandleKeyboardEvent(source, event, is_keyboard_shortcut);
 180
 181   *is_keyboard_shortcut = false;
 182   return false;
 183 }
 184
 185 void ExtensionViewHost::HandleKeyboardEvent(
 186     WebContents* source,
 187     const NativeWebKeyboardEvent& event) {
 188   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
 189     if (event.type == NativeWebKeyboardEvent::RawKeyDown &&
 190         event.windowsKeyCode == ui::VKEY_ESCAPE) {
 191       Close();
 192       return;
 193     }
 194   }
 195   UnhandledKeyboardEvent(source, event);
 196 }
 197
 198 bool ExtensionViewHost::PreHandleGestureEvent(
 199     content::WebContents* source,
 200     const blink::WebGestureEvent& event) {
 201   // Disable pinch zooming.
 202   return event.type == blink::WebGestureEvent::GesturePinchBegin ||
 203       event.type == blink::WebGestureEvent::GesturePinchUpdate ||
 204       event.type == blink::WebGestureEvent::GesturePinchEnd;
 205 }
 206
 207 content::ColorChooser* ExtensionViewHost::OpenColorChooser(
 208     WebContents* web_contents,
 209     SkColor initial_color,
 210     const std::vector<content::ColorSuggestion>& suggestions) {
 211   // Similar to the file chooser below, opening a color chooser requires a
 212   // visible <input> element to click on. Therefore this code only exists for
 213   // extensions with a view.
 214   return chrome::ShowColorChooser(web_contents, initial_color);
 215 }
 216
 217 void ExtensionViewHost::RunFileChooser(
 218     WebContents* tab,
 219     const content::FileChooserParams& params) {
 220   // For security reasons opening a file picker requires a visible <input>
 221   // element to click on, so this code only exists for extensions with a view.
 222   FileSelectHelper::RunFileChooser(tab, params);
 223 }
 224
 225
 226 void ExtensionViewHost::ResizeDueToAutoResize(WebContents* source,
 227                                           const gfx::Size& new_size) {
 228   view_->ResizeDueToAutoResize(new_size);
 229 }
 230
 231 // content::WebContentsObserver overrides:
 232
 233 void ExtensionViewHost::RenderViewCreated(RenderViewHost* render_view_host) {
 234   ExtensionHost::RenderViewCreated(render_view_host);
 235
 236   view_->RenderViewCreated();
 237
 238   // If the host is bound to a window, then extract its id. Extensions hosted
 239   // in ExternalTabContainer objects may not have an associated window.
 240   WindowController* window = GetExtensionWindowController();
 241   if (window) {
 242     render_view_host->Send(new ExtensionMsg_UpdateBrowserWindowId(
 243         render_view_host->GetRoutingID(), window->GetWindowId()));
 244   }
 245 }
 246
 247 // web_modal::WebContentsModalDialogManagerDelegate overrides:
 248
 249 web_modal::WebContentsModalDialogHost*
 250 ExtensionViewHost::GetWebContentsModalDialogHost() {
 251   return this;
 252 }
 253
 254 bool ExtensionViewHost::IsWebContentsVisible(WebContents* web_contents) {
 255   return platform_util::IsVisible(web_contents->GetNativeView());
 256 }
 257
 258 gfx::NativeView ExtensionViewHost::GetHostView() const {
 259   return view_->GetNativeView();
 260 }
 261
 262 gfx::Point ExtensionViewHost::GetDialogPosition(const gfx::Size& size) {
 263   if (!GetVisibleWebContents())
 264     return gfx::Point();
 265   gfx::Rect bounds = GetVisibleWebContents()->GetViewBounds();
 266   return gfx::Point(
 267       std::max(0, (bounds.width() - size.width()) / 2),
 268       std::max(0, (bounds.height() - size.height()) / 2));
 269 }
 270
 271 gfx::Size ExtensionViewHost::GetMaximumDialogSize() {
 272   if (!GetVisibleWebContents())
 273     return gfx::Size();
 274   return GetVisibleWebContents()->GetViewBounds().size();
 275 }
 276
 277 void ExtensionViewHost::AddObserver(
 278     web_modal::ModalDialogHostObserver* observer) {
 279 }
 280
 281 void ExtensionViewHost::RemoveObserver(
 282     web_modal::ModalDialogHostObserver* observer) {
 283 }
 284
 285 WindowController* ExtensionViewHost::GetExtensionWindowController() const {
 286   Browser* browser = view_->GetBrowser();
 287   return browser ? browser->extension_window_controller() : NULL;
 288 }
 289
 290 WebContents* ExtensionViewHost::GetAssociatedWebContents() const {
 291   return associated_web_contents_;
 292 }
 293
 294 WebContents* ExtensionViewHost::GetVisibleWebContents() const {
 295   if (associated_web_contents_)
 296     return associated_web_contents_;
 297   if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP)
 298     return host_contents();
 299   return NULL;
 300 }
 301
 302 void ExtensionViewHost::Observe(int type,
 303                                 const content::NotificationSource& source,
 304                                 const content::NotificationDetails& details) {
 305   if (type == extensions::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY) {
 306     DCHECK(ExtensionSystem::Get(browser_context())->
 307                runtime_data()->IsBackgroundPageReady(extension()));
 308     LoadInitialURL();
 309     return;
 310   }
 311   ExtensionHost::Observe(type, source, details);
 312 }
 313
 314 void ExtensionViewHost::InsertInfobarCSS() {
 315   static const base::StringPiece css(
 316       ResourceBundle::GetSharedInstance().GetRawDataResource(
 317       IDR_EXTENSIONS_INFOBAR_CSS));
 318
 319   host_contents()->InsertCSS(css.as_string());
 320 }
 321
 322 }  // namespace extensions