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_service.h"
10#include "chrome/browser/extensions/extension_system.h"
11#include "chrome/browser/extensions/window_controller.h"
12#include "chrome/browser/file_select_helper.h"
13#include "chrome/browser/platform_util.h"
14#include "chrome/browser/ui/browser.h"
15#include "chrome/browser/ui/browser_dialogs.h"
16#include "chrome/common/extensions/extension_messages.h"
17#include "components/web_modal/web_contents_modal_dialog_manager.h"
18#include "content/public/browser/notification_source.h"
19#include "content/public/browser/render_view_host.h"
20#include "content/public/browser/web_contents.h"
21#include "content/public/browser/web_contents_view.h"
22#include "grit/browser_resources.h"
23#include "ui/base/resource/resource_bundle.h"
24#include "ui/events/keycodes/keyboard_codes.h"
25
26using content::NativeWebKeyboardEvent;
27using content::OpenURLParams;
28using content::RenderViewHost;
29using content::WebContents;
30using content::WebContentsObserver;
31using web_modal::WebContentsModalDialogManager;
32
33namespace extensions {
34
35// Notifies an ExtensionViewHost when a WebContents is destroyed.
36class 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
56ExtensionViewHost::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
69ExtensionViewHost::~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
78void 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#elif defined(TOOLKIT_GTK)
88  view_.reset(new ExtensionViewGtk(this, browser));
89  view_->Init();
90#else
91  // TODO(port)
92  NOTREACHED();
93#endif
94}
95
96void ExtensionViewHost::SetAssociatedWebContents(WebContents* web_contents) {
97  associated_web_contents_ = web_contents;
98  if (associated_web_contents_) {
99    // Observe the new WebContents for deletion.
100    associated_web_contents_observer_.reset(
101        new AssociatedWebContentsObserver(this, associated_web_contents_));
102  } else {
103    associated_web_contents_observer_.reset();
104  }
105}
106
107void ExtensionViewHost::UnhandledKeyboardEvent(
108    WebContents* source,
109    const content::NativeWebKeyboardEvent& event) {
110  Browser* browser = view_->browser();
111  if (browser) {
112    // Handle lower priority browser shortcuts such as Ctrl-f.
113    return browser->HandleKeyboardEvent(source, event);
114  } else {
115#if defined(TOOLKIT_VIEWS)
116    // In case there's no Browser (e.g. for dialogs), pass it to
117    // ExtensionViewViews to handle accelerators. The view's FocusManager does
118    // not know anything about Browser accelerators, but might know others such
119    // as Ash's.
120    view_->HandleKeyboardEvent(event);
121#endif
122  }
123}
124
125// ExtensionHost overrides:
126
127void ExtensionViewHost::OnDidStopLoading() {
128  DCHECK(did_stop_loading());
129#if defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
130  view_->DidStopLoading();
131#endif
132}
133
134void ExtensionViewHost::OnDocumentAvailable() {
135  if (extension_host_type() == VIEW_TYPE_EXTENSION_INFOBAR) {
136    // No style sheet for other types, at the moment.
137    InsertInfobarCSS();
138  }
139}
140
141void ExtensionViewHost::LoadInitialURL() {
142  if (!ExtensionSystem::GetForBrowserContext(browser_context())->
143          extension_service()->IsBackgroundPageReady(extension())) {
144    // Make sure the background page loads before any others.
145    registrar()->Add(this,
146                     chrome::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY,
147                     content::Source<Extension>(extension()));
148    return;
149  }
150
151  // Popups may spawn modal dialogs, which need positioning information.
152  if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
153    WebContentsModalDialogManager::CreateForWebContents(host_contents());
154    WebContentsModalDialogManager::FromWebContents(
155        host_contents())->SetDelegate(this);
156  }
157
158  ExtensionHost::LoadInitialURL();
159}
160
161bool ExtensionViewHost::IsBackgroundPage() const {
162  DCHECK(view_);
163  return false;
164}
165
166// content::WebContentsDelegate overrides:
167
168WebContents* ExtensionViewHost::OpenURLFromTab(
169    WebContents* source,
170    const OpenURLParams& params) {
171  // Whitelist the dispositions we will allow to be opened.
172  switch (params.disposition) {
173    case SINGLETON_TAB:
174    case NEW_FOREGROUND_TAB:
175    case NEW_BACKGROUND_TAB:
176    case NEW_POPUP:
177    case NEW_WINDOW:
178    case SAVE_TO_DISK:
179    case OFF_THE_RECORD: {
180      // Only allow these from hosts that are bound to a browser (e.g. popups).
181      // Otherwise they are not driven by a user gesture.
182      Browser* browser = view_->browser();
183      return browser ? browser->OpenURL(params) : NULL;
184    }
185    default:
186      return NULL;
187  }
188}
189
190bool ExtensionViewHost::PreHandleKeyboardEvent(
191    WebContents* source,
192    const NativeWebKeyboardEvent& event,
193    bool* is_keyboard_shortcut) {
194  if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP &&
195      event.type == NativeWebKeyboardEvent::RawKeyDown &&
196      event.windowsKeyCode == ui::VKEY_ESCAPE) {
197    DCHECK(is_keyboard_shortcut != NULL);
198    *is_keyboard_shortcut = true;
199    return false;
200  }
201
202  // Handle higher priority browser shortcuts such as Ctrl-w.
203  Browser* browser = view_->browser();
204  if (browser)
205    return browser->PreHandleKeyboardEvent(source, event, is_keyboard_shortcut);
206
207  *is_keyboard_shortcut = false;
208  return false;
209}
210
211void ExtensionViewHost::HandleKeyboardEvent(
212    WebContents* source,
213    const NativeWebKeyboardEvent& event) {
214  if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP) {
215    if (event.type == NativeWebKeyboardEvent::RawKeyDown &&
216        event.windowsKeyCode == ui::VKEY_ESCAPE) {
217      Close();
218      return;
219    }
220  }
221  UnhandledKeyboardEvent(source, event);
222}
223
224content::ColorChooser* ExtensionViewHost::OpenColorChooser(
225    WebContents* web_contents,
226    SkColor initial_color,
227    const std::vector<content::ColorSuggestion>& suggestions) {
228  // Similar to the file chooser below, opening a color chooser requires a
229  // visible <input> element to click on. Therefore this code only exists for
230  // extensions with a view.
231  return chrome::ShowColorChooser(web_contents, initial_color);
232}
233
234void ExtensionViewHost::RunFileChooser(
235    WebContents* tab,
236    const content::FileChooserParams& params) {
237  // For security reasons opening a file picker requires a visible <input>
238  // element to click on, so this code only exists for extensions with a view.
239  FileSelectHelper::RunFileChooser(tab, params);
240}
241
242
243void ExtensionViewHost::ResizeDueToAutoResize(WebContents* source,
244                                          const gfx::Size& new_size) {
245  view_->ResizeDueToAutoResize(new_size);
246}
247
248// content::WebContentsObserver overrides:
249
250void ExtensionViewHost::RenderViewCreated(RenderViewHost* render_view_host) {
251  ExtensionHost::RenderViewCreated(render_view_host);
252
253  view_->RenderViewCreated();
254
255  // If the host is bound to a window, then extract its id. Extensions hosted
256  // in ExternalTabContainer objects may not have an associated window.
257  WindowController* window = GetExtensionWindowController();
258  if (window) {
259    render_view_host->Send(new ExtensionMsg_UpdateBrowserWindowId(
260        render_view_host->GetRoutingID(), window->GetWindowId()));
261  }
262}
263
264// web_modal::WebContentsModalDialogManagerDelegate overrides:
265
266web_modal::WebContentsModalDialogHost*
267ExtensionViewHost::GetWebContentsModalDialogHost() {
268  return this;
269}
270
271bool ExtensionViewHost::IsWebContentsVisible(WebContents* web_contents) {
272  return platform_util::IsVisible(web_contents->GetView()->GetNativeView());
273}
274
275gfx::NativeView ExtensionViewHost::GetHostView() const {
276  return view_->native_view();
277}
278
279gfx::Point ExtensionViewHost::GetDialogPosition(const gfx::Size& size) {
280  if (!GetVisibleWebContents())
281    return gfx::Point();
282  gfx::Rect bounds = GetVisibleWebContents()->GetView()->GetViewBounds();
283  return gfx::Point(
284      std::max(0, (bounds.width() - size.width()) / 2),
285      std::max(0, (bounds.height() - size.height()) / 2));
286}
287
288gfx::Size ExtensionViewHost::GetMaximumDialogSize() {
289  if (!GetVisibleWebContents())
290    return gfx::Size();
291  return GetVisibleWebContents()->GetView()->GetViewBounds().size();
292}
293
294void ExtensionViewHost::AddObserver(
295    web_modal::ModalDialogHostObserver* observer) {
296}
297
298void ExtensionViewHost::RemoveObserver(
299    web_modal::ModalDialogHostObserver* observer) {
300}
301
302WindowController* ExtensionViewHost::GetExtensionWindowController() const {
303  return view_->browser() ? view_->browser()->extension_window_controller()
304                          : NULL;
305}
306
307WebContents* ExtensionViewHost::GetAssociatedWebContents() const {
308  return associated_web_contents_;
309}
310
311WebContents* ExtensionViewHost::GetVisibleWebContents() const {
312  if (associated_web_contents_)
313    return associated_web_contents_;
314  if (extension_host_type() == VIEW_TYPE_EXTENSION_POPUP)
315    return host_contents();
316  return NULL;
317}
318
319void ExtensionViewHost::Observe(int type,
320                                const content::NotificationSource& source,
321                                const content::NotificationDetails& details) {
322  if (type == chrome::NOTIFICATION_EXTENSION_BACKGROUND_PAGE_READY) {
323    DCHECK(ExtensionSystem::GetForBrowserContext(browser_context())->
324               extension_service()->IsBackgroundPageReady(extension()));
325    LoadInitialURL();
326    return;
327  }
328  ExtensionHost::Observe(type, source, details);
329}
330
331void ExtensionViewHost::InsertInfobarCSS() {
332  static const base::StringPiece css(
333      ResourceBundle::GetSharedInstance().GetRawDataResource(
334      IDR_EXTENSIONS_INFOBAR_CSS));
335
336  render_view_host()->InsertCSS(base::string16(), css.as_string());
337}
338
339}  // namespace extensions
340