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| 1 // Copyright 2012 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_UI_SEARCH_INSTANT_LOADER_H_ | |
| 6 #define CHROME_BROWSER_UI_SEARCH_INSTANT_LOADER_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/callback.h" | |
| 10 #include "base/compiler_specific.h" | |
| 11 #include "base/memory/scoped_ptr.h" | |
| 12 #include "base/timer/timer.h" | |
| 13 #include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h" | |
| 14 #include "content/public/browser/notification_observer.h" | |
| 15 #include "content/public/browser/notification_registrar.h" | |
| 16 #include "content/public/browser/web_contents_delegate.h" | |
| 17 | |
| 18 class GURL; | |
| 19 class Profile; | |
| 20 | |
| 21 namespace content { | |
| 22 struct OpenURLParams; | |
| 23 class WebContents; | |
| 24 } | |
| 25 | |
| 26 // InstantLoader is used to create and maintain a WebContents where we can | |
| 27 // preload a page into. It is used by InstantNTP to preload an Instant page. | |
| 28 class InstantLoader : public content::NotificationObserver, | |
| 29 public content::WebContentsDelegate, | |
| 30 public CoreTabHelperDelegate { | |
| 31 public: | |
| 32 // InstantLoader calls these methods on its delegate in response to certain | |
| 33 // changes in the underlying contents. | |
| 34 class Delegate { | |
| 35 public: | |
| 36 // Called after someone has swapped in a different WebContents for ours. | |
| 37 virtual void OnSwappedContents() = 0; | |
| 38 | |
| 39 // Called to open a URL using the underlying contents (see | |
| 40 // WebContentsDelegate::OpenURLFromTab). The Delegate should return the | |
| 41 // WebContents the URL is opened in, or NULL if the URL wasn't opened | |
| 42 // immediately. | |
| 43 virtual content::WebContents* OpenURLFromTab( | |
| 44 content::WebContents* source, | |
| 45 const content::OpenURLParams& params) = 0; | |
| 46 | |
| 47 // Called when a main frame load is complete. | |
| 48 virtual void LoadCompletedMainFrame() = 0; | |
| 49 | |
| 50 protected: | |
| 51 ~Delegate(); | |
| 52 }; | |
| 53 | |
| 54 explicit InstantLoader(Delegate* delegate); | |
| 55 virtual ~InstantLoader(); | |
| 56 | |
| 57 // Creates a new WebContents in the context of |profile| that will be used to | |
| 58 // load |instant_url|. The page is not actually loaded until Load() is | |
| 59 // called. |on_stale_callback| will be called after kStalePageTimeoutMS | |
| 60 // has elapsed after Load() being called. | |
| 61 void Init(const GURL& instant_url, | |
| 62 Profile* profile, | |
| 63 const base::Closure& on_stale_callback); | |
| 64 | |
| 65 // Loads |instant_url_| in |contents_|. | |
| 66 void Load(); | |
| 67 | |
| 68 // Returns the contents currently held. May be NULL. | |
| 69 content::WebContents* contents() const { return contents_.get(); } | |
| 70 | |
| 71 // Replaces the contents held with |contents|. Any existing contents is | |
| 72 // deleted. The expiration timer is not restarted. | |
| 73 void SetContents(scoped_ptr<content::WebContents> contents); | |
| 74 | |
| 75 // Releases the contents currently held. Must only be called if contents() is | |
| 76 // not NULL. | |
| 77 scoped_ptr<content::WebContents> ReleaseContents(); | |
| 78 | |
| 79 private: | |
| 80 // Overridden from content::NotificationObserver: | |
| 81 virtual void Observe(int type, | |
| 82 const content::NotificationSource& source, | |
| 83 const content::NotificationDetails& details) OVERRIDE; | |
| 84 | |
| 85 // Overridden from CoreTabHelperDelegate: | |
| 86 virtual void SwapTabContents(content::WebContents* old_contents, | |
| 87 content::WebContents* new_contents) OVERRIDE; | |
| 88 | |
| 89 // Overridden from content::WebContentsDelegate: | |
| 90 virtual bool ShouldSuppressDialogs() OVERRIDE; | |
| 91 virtual bool ShouldFocusPageAfterCrash() OVERRIDE; | |
| 92 virtual void CanDownload(content::RenderViewHost* render_view_host, | |
| 93 int request_id, | |
| 94 const std::string& request_method, | |
| 95 const base::Callback<void(bool)>& callback) OVERRIDE; | |
| 96 virtual bool OnGoToEntryOffset(int offset) OVERRIDE; | |
| 97 virtual content::WebContents* OpenURLFromTab( | |
| 98 content::WebContents* source, | |
| 99 const content::OpenURLParams& params) OVERRIDE; | |
| 100 | |
| 101 Delegate* const delegate_; | |
| 102 scoped_ptr<content::WebContents> contents_; | |
| 103 | |
| 104 // The URL we will be loading. | |
| 105 GURL instant_url_; | |
| 106 | |
| 107 // Called when |stale_page_timer_| fires. | |
| 108 base::Closure on_stale_callback_; | |
| 109 | |
| 110 // Used to mark when the page is stale. | |
| 111 base::Timer stale_page_timer_; | |
| 112 | |
| 113 // Used to get notifications about renderers. | |
| 114 content::NotificationRegistrar registrar_; | |
| 115 | |
| 116 DISALLOW_COPY_AND_ASSIGN(InstantLoader); | |
| 117 }; | |
| 118 | |
| 119 #endif // CHROME_BROWSER_UI_SEARCH_INSTANT_LOADER_H_ | |
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Chromium Code Reviews
Issue 137993020:
(Try 2) InstantExtended: remove dead code related to the non-cacheable NTP. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src