cef/include/cef_life_span_handler.h

// Copyright (c) 2012 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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//
// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//

#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_