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| 1 // Copyright 2016 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 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_SHARED_WEB_VIEW_H_ | |
| 6 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_SHARED_WEB_VIEW_H_ | |
| 7 | |
| 8 #include <memory> | |
| 9 | |
| 10 #include "base/macros.h" | |
| 11 #include "base/memory/memory_pressure_listener.h" | |
| 12 #include "base/memory/ref_counted.h" | |
| 13 #include "components/keyed_service/core/keyed_service.h" | |
| 14 #include "content/public/browser/notification_observer.h" | |
| 15 #include "content/public/browser/notification_registrar.h" | |
| 16 #include "url/gurl.h" | |
| 17 | |
| 18 class Profile; | |
| 19 | |
| 20 namespace chromeos { | |
| 21 | |
| 22 class WebViewHandle; | |
| 23 | |
| 24 // Stores and fetches a views::WebView instance that is ulimately owned by the | |
| 25 // signin profile. This allows for a WebView to be reused over time or | |
| 26 // preloaded. Use SharedWebViewFactory to get an instance of this class. | |
| 27 class SharedWebView : public KeyedService, | |
| 28 public content::NotificationObserver { | |
| 29 public: | |
| 30 explicit SharedWebView(Profile* profile); | |
| 31 ~SharedWebView() override; | |
| 32 void Shutdown() override; | |
| 33 | |
| 34 // Stores a webview instance inside of |out_handle|. |url| is the initial | |
| 35 // URL that the webview stores (note: this function does not perform the | |
| 36 // navigation). This returns true if the webview was reused, false if it | |
| 37 // was freshly created. | |
| 38 bool Get(const GURL& url, scoped_refptr<WebViewHandle>* out_handle); | |
| 39 | |
| 40 // Returns true if there is an attached views::WebView instance. | |
| 41 bool has_web_view() const { return !!web_view_handle_; } | |
| 42 | |
| 43 private: | |
| 44 // content::NotificationObserver: | |
| 45 void Observe(int type, | |
| 46 const content::NotificationSource& source, | |
| 47 const content::NotificationDetails& details) override; | |
| 48 | |
| 49 // Called when there is a memory pressure event. | |
| 50 void OnMemoryPressure( | |
| 51 base::MemoryPressureListener::MemoryPressureLevel level); | |
| 52 | |
| 53 content::NotificationRegistrar registrar_; | |
| 54 | |
| 55 // Profile used for creating the views::WebView instance. | |
| 56 Profile* const profile_; | |
| 57 | |
| 58 // Cached URL that the |web_view_| instance should point to used for | |
| 59 // validation. | |
| 60 GURL web_view_url_; | |
| 61 | |
| 62 // Shared web-view instance. Callers may take a reference on the handle so it | |
| 63 // could outlive this class. | |
| 64 scoped_refptr<WebViewHandle> web_view_handle_; | |
| 65 | |
| 66 std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_; | |
| 67 | |
| 68 DISALLOW_COPY_AND_ASSIGN(SharedWebView); | |
| 69 }; | |
| 70 | |
| 71 } // namespace chromeos | |
| 72 | |
| 73 #endif // CHROME_BROWSER_CHROMEOS_LOGIN_UI_SHARED_WEB_VIEW_H_ | |
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Chromium Code Reviews
Issue 2610373002:
cros: Only preload the lock screen; do not reuse it. (Closed)
