cef_life_span_handler.h

// Copyright (c) 2012 Marshall A. Greenblatt. All rights reserved.
//
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#ifndef CEF_INCLUDE_CEF_LIFE_SPAN_HANDLER_H_
#define CEF_INCLUDE_CEF_LIFE_SPAN_HANDLER_H_
#pragma once

#include "include/cef_base.h"
#include "include/cef_browser.h"

class CefClient;

///
/// 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.
///
/*--cef(source=client)--*/
class CefLifeSpanHandler : public virtual CefBaseRefCounted {
 public:
  typedef cef_window_open_disposition_t WindowOpenDisposition;

  ///
  /// 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). The
  /// |extra_info| parameter provides an opportunity to specify extra
  /// information specific to the created popup browser that will be passed to
  /// CefRenderProcessHandler::OnBrowserCreated() in the render process.
  ///
  /*--cef(optional_param=target_url,optional_param=target_frame_name)--*/
  virtual bool OnBeforePopup(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             const CefString& target_url,
                             const CefString& target_frame_name,
                             WindowOpenDisposition target_disposition,
                             bool user_gesture,
                             const CefPopupFeatures& popupFeatures,
                             CefWindowInfo& windowInfo,
                             CefRefPtr<CefClient>& client,
                             CefBrowserSettings& settings,
                             CefRefPtr<CefDictionaryValue>& extra_info,
                             bool* no_javascript_access) {
    return false;
  }

  ///
  /// Called after a new browser is created. It is now safe to begin performing
  /// actions with |browser|. CefFrameHandler callbacks related to initial main
  /// frame creation will arrive before this callback. See CefFrameHandler
  /// documentation for additional usage information.
  ///
  /*--cef()--*/
  virtual void OnAfterCreated(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.
  ///
  /*--cef()--*/
  virtual bool DoClose(CefRefPtr<CefBrowser> browser) { return false; }

  ///
  /// 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 (other than IsValid, GetIdentifier or IsSame) after this callback
  /// returns. CefFrameHandler callbacks related to final main frame destruction
  /// will arrive after this callback and CefBrowser::IsValid will return false
  /// at that time. Any in-progress network requests associated with |browser|
  /// will be aborted when the browser is destroyed, and
  /// CefResourceRequestHandler callbacks related to those requests may still
  /// arrive on the IO thread after this callback. See CefFrameHandler and
  /// DoClose() documentation for additional usage information.
  ///
  /*--cef()--*/
  virtual void OnBeforeClose(CefRefPtr<CefBrowser> browser) {}
};

#endif  // CEF_INCLUDE_CEF_LIFE_SPAN_HANDLER_H_