cef/include/cef_life_span_handler.h

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// 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
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// ---------------------------------------------------------------------------
//
// 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.
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///
/*--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 on the UI thread before a new DevTools popup browser is created.
/// The |browser| value represents the source of the popup request. Optionally
/// modify |windowInfo|, |client|, |settings| and |extra_info| values. The
/// |client|, |settings| and |extra_info| values will default to the source
/// browser's values. Any modifications to |windowInfo| will be ignored if the
/// parent browser is Views-hosted (wrapped in a CefBrowserView).
///
/// 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. The
/// existing |extra_info| object, if any, will be read-only but may be
/// replaced with a new object.
///
/// Views-hosted source browsers will create Views-hosted DevTools popups
/// unless |use_default_window| is set to to true. DevTools popups can be
/// blocked by returning true from CefCommandHandler::OnChromeCommand for
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/// IDC_DEV_TOOLS. Only used with Chrome style.
///
/*--cef()--*/
virtual void OnBeforeDevToolsPopup(CefRefPtr<CefBrowser> browser,
CefWindowInfo& windowInfo,
CefRefPtr<CefClient>& client,
CefBrowserSettings& settings,
CefRefPtr<CefDictionaryValue>& extra_info,
bool* use_default_window) {}
///
/// 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 an Alloy style browser is ready to be closed, meaning that the
/// close has already been initiated and that JavaScript unload handlers have
/// already executed or should be ignored. This may result directly from a
/// call to CefBrowserHost::[Try]CloseBrowser() or indirectly if the browser's
/// top-level parent window was created by CEF and the user attempts to
/// close that window (by clicking the 'X', for example). DoClose() will not
/// be called if the browser's host window/view has already been destroyed
/// (via parent window/view hierarchy tear-down, for example), as it is no
/// longer possible to customize the close behavior at that point.
///
/// An application should handle top-level parent 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 JavaScript unload handlers and optionally cancel the close
/// before DoClose() is called.
///
/// When windowed rendering is enabled CEF will create an internal child
/// window/view to host the browser. In that case returning false from
/// DoClose() will send the standard close notification to the browser's
/// top-level parent window (e.g. WM_CLOSE on Windows, performClose: on OS X,
/// "delete_event" on Linux or CefWindowDelegate::CanClose() callback from
/// Views).
///
/// When windowed rendering is disabled there is no internal window/view
/// and returning false from DoClose() will cause the browser object to be
/// destroyed immediately.
///
/// If the browser's top-level parent window requires a non-standard close
/// notification then send that notification from DoClose() and return true.
/// You are still required to complete the browser close as soon as possible
/// (either by calling [Try]CloseBrowser() or by proceeding with window/view
/// hierarchy tear-down), otherwise the browser will be left in a partially
/// closed state that interferes with proper functioning. Top-level windows
/// created on the browser process UI thread can alternately call
/// CefBrowserHost::IsReadyToBeClosed() in the close handler to check close
/// status instead of relying on custom DoClose() handling. See documentation
/// on that method for additional details.
///
/// 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() (similar to calling 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. Application's DoClose() handler is called and returns false by
/// default.
/// 7. CEF sends a close notification to the application's top-level window
/// (because DoClose() returned false).
/// 8. Application's top-level window receives the close notification and
/// calls TryCloseBrowser(). TryCloseBrowser() returns true so the client
/// allows the window close.
/// 9. Application's top-level window is destroyed, triggering destruction
/// of the child browser window.
/// 10. Application's OnBeforeClose() handler is called and the browser object
/// is destroyed.
/// 11. 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 top-level window close attempt
/// will be allowed.
/// B. Return false.
/// 7. CEF sends a close notification to the application's top-level window
/// (because DoClose() returned false).
/// 8. Application's top-level window receives the close notification and
/// allows the window to close based on the flag from #6A.
/// 9. Application's top-level window is destroyed, triggering destruction
/// of the child browser window.
/// 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_