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CEF3 C++ API Docs - Version 3.3239.1700.g385b2d4
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(default)
Class CefLifeSpanHandler

CefBaseRefCounted
   |
   +--CefLifeSpanHandler

   in cef_life_span_handler.h

class CefLifeSpanHandler
extends CefBaseRefCounted

Implement this interface to handle events related to browser life span. The methods of this class will be called on the UI thread unless otherwise indicated.


Inner Classes, Typedefs, and Enums
typedef CefLifeSpanHandler::WindowOpenDisposition
          
 
Method Summary
 virtual bool DoClose( CefRefPtr< CefBrowser > browser )
          Called when a browser has recieved a request to close.
 virtual void OnAfterCreated( CefRefPtr< CefBrowser > browser )
          Called after a new browser is created.
 virtual void OnBeforeClose( CefRefPtr< CefBrowser > browser )
          Called just before a browser is destroyed.
 virtual bool OnBeforePopup( CefRefPtr< CefBrowser > browser, CefRefPtr< CefFrame > frame, const CefString& target_url, const CefString& target_frame_name, CefLifeSpanHandler::WindowOpenDisposition target_disposition, bool user_gesture, const CefPopupFeatures& popupFeatures, CefWindowInfo& windowInfo, CefRefPtr< CefClient >& client, CefBrowserSettings& settings, bool* no_javascript_access )
          Called on the UI thread before a new popup browser is created.
   
Methods inherited from class CefBaseRefCounted
AddRef, Release, HasOneRef
 

Method Detail

DoClose

public virtual bool DoClose( CefRefPtr< CefBrowser > browser );
Called when a browser has recieved a request to close. This may result directly from a call to CefBrowserHost::*CloseBrowser() or indirectly if the browser is parented to a top-level window created by CEF and the user attempts to close that window (by clicking the 'X', for example). The DoClose() method will be called after the JavaScript 'onunload' event has been fired. An application should handle top-level owner window close notifications by calling CefBrowserHost::TryCloseBrowser() or CefBrowserHost::CloseBrowser(false) instead of allowing the window to close immediately (see the examples below). This gives CEF an opportunity to process the 'onbeforeunload' event and optionally cancel the close before DoClose() is called. When windowed rendering is enabled CEF will internally create a window or view to host the browser. In that case returning false from DoClose() will send the standard close notification to the browser's top-level owner window (e.g. WM_CLOSE on Windows, performClose: on OS X, "delete_event" on Linux or CefWindowDelegate::CanClose() callback from Views). If the browser's host window/view has already been destroyed (via view hierarchy tear-down, for example) then DoClose() will not be called for that browser since is no longer possible to cancel the close. When windowed rendering is disabled returning false from DoClose() will cause the browser object to be destroyed immediately. If the browser's top-level owner window requires a non-standard close notification then send that notification from DoClose() and return true. The CefLifeSpanHandler::OnBeforeClose() method will be called after DoClose() (if DoClose() is called) and immediately before the browser object is destroyed. The application should only exit after OnBeforeClose() has been called for all existing browsers. The below examples describe what should happen during window close when the browser is parented to an application-provided top-level window. Example 1: Using CefBrowserHost::TryCloseBrowser(). This is recommended for clients using standard close handling and windows created on the browser process UI thread. 1. User clicks the window close button which sends a close notification to the application's top-level window. 2. Application's top-level window receives the close notification and calls TryCloseBrowser() (which internally calls CloseBrowser(false)). TryCloseBrowser() returns false so the client cancels the window close. 3. JavaScript 'onbeforeunload' handler executes and shows the close confirmation dialog (which can be overridden via CefJSDialogHandler::OnBeforeUnloadDialog()). 4. User approves the close. 5. JavaScript 'onunload' handler executes. 6. CEF sends a close notification to the application's top-level window (because DoClose() returned false by default). 7. Application's top-level window receives the close notification and calls TryCloseBrowser(). TryCloseBrowser() returns true so the client allows the window close. 8. Application's top-level window is destroyed. 9. Application's OnBeforeClose() handler is called and the browser object is destroyed. 10. Application exits by calling CefQuitMessageLoop() if no other browsers exist. Example 2: Using CefBrowserHost::CloseBrowser(false) and implementing the DoClose() callback. This is recommended for clients using non-standard close handling or windows that were not created on the browser process UI thread. 1. User clicks the window close button which sends a close notification to the application's top-level window. 2. Application's top-level window receives the close notification and: A. Calls CefBrowserHost::CloseBrowser(false). B. Cancels the window close. 3. JavaScript 'onbeforeunload' handler executes and shows the close confirmation dialog (which can be overridden via CefJSDialogHandler::OnBeforeUnloadDialog()). 4. User approves the close. 5. JavaScript 'onunload' handler executes. 6. Application's DoClose() handler is called. Application will: A. Set a flag to indicate that the next close attempt will be allowed. B. Return false. 7. CEF sends an close notification to the application's top-level window. 8. Application's top-level window receives the close notification and allows the window to close based on the flag from #6B. 9. Application's top-level window is destroyed. 10. Application's OnBeforeClose() handler is called and the browser object is destroyed. 11. Application exits by calling CefQuitMessageLoop() if no other browsers exist.

OnAfterCreated

public virtual void OnAfterCreated( CefRefPtr< CefBrowser > browser );
Called after a new browser is created. This callback will be the first notification that references |browser|.

OnBeforeClose

public virtual void OnBeforeClose( CefRefPtr< CefBrowser > browser );
Called just before a browser is destroyed. Release all references to the browser object and do not attempt to execute any methods on the browser object after this callback returns. This callback will be the last notification that references |browser|. See DoClose() documentation for additional usage information.

OnBeforePopup

public virtual bool OnBeforePopup( CefRefPtr< CefBrowser > browser, CefRefPtr< CefFrame > frame, const CefString& target_url, const CefString& target_frame_name, CefLifeSpanHandler::WindowOpenDisposition target_disposition, bool user_gesture, const CefPopupFeatures& popupFeatures, CefWindowInfo& windowInfo, CefRefPtr< CefClient >& client, CefBrowserSettings& settings, bool* no_javascript_access );
Called on the UI thread before a new popup browser is created. The |browser| and |frame| values represent the source of the popup request. The |target_url| and |target_frame_name| values indicate where the popup browser should navigate and may be empty if not specified with the request. The |target_disposition| value indicates where the user intended to open the popup (e.g. current tab, new tab, etc). The |user_gesture| value will be true if the popup was opened via explicit user gesture (e.g. clicking a link) or false if the popup opened automatically (e.g. via the DomContentLoaded event). The |popupFeatures| structure contains additional information about the requested popup window. To allow creation of the popup browser optionally modify |windowInfo|, |client|, |settings| and |no_javascript_access| and return false. To cancel creation of the popup browser return true. The |client| and |settings| values will default to the source browser's values. If the |no_javascript_access| value is set to false the new browser will not be scriptable and may not be hosted in the same renderer process as the source browser. Any modifications to |windowInfo| will be ignored if the parent browser is wrapped in a CefBrowserView. Popup browser creation will be canceled if the parent browser is destroyed before the popup browser creation completes (indicated by a call to OnAfterCreated for the popup browser).

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CEF3 C++ API Docs - Version 3.3239.1700.g385b2d4
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Chromium Embedded Framework (CEF) Copyright © 2016 Marshall A. Greenblatt