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When BackForwardCache is enabled and the user navigates the main frame
back/forward a new RFH may be created for an existing main frame GlobalId value
and CefFrameHostImpl (e.g. an object that was previously Detach()ed after main
frame navigation called SetMainFrame, but for which RenderFrameDeleted was not
subsequently called due to insertion in the BackForwardCache). In this case we
can re-attach the new RFH to the existing main frame CefFrameHostImpl in
RenderFrameHostStateChanged and resume processing of messages.
Swapping back/forward to an existing (already loaded) renderer does not trigger
new notifications for draggable regions (e.g. RenderFrameObserver::
DraggableRegionsChanged is not called by default). We therefore explicitly
request an update of draggable regions by sending the DidStopLoading message to
the renderer.
A new |reattached| parameter is added to CefFrameHandler::OnFrameAttached to
support identification of BackForwardCache usage by the client.
To test with unit tests:
Run `ceftests --gtest_filter=DraggableRegionsTest.DraggableRegionsCrossOrigin
--enable-features=BackForwardCache`
To test manually:
1. Run `cefclient --enable-features=BackForwardCache --use-views
--url=http://tests/draggable`, note that draggable regions work.
2. Load https://www.google.com via the address bar, note that draggable regions
are removed.
3. Go back to http://tests/draggable, note that draggable regions work.
4. Go forward to https://www.google.com, note that draggable regions are
removed.
50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
// Copyright (c) 2021 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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//
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// ---------------------------------------------------------------------------
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//
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// This file was generated by the CEF translator tool. If making changes by
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// hand only do so within the body of existing method and function
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// implementations. See the translator.README.txt file in the tools directory
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// for more information.
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//
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// $hash=e20bf114ab84481c3c1c1978b06c32b88f2aa136$
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//
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#ifndef CEF_LIBCEF_DLL_CTOCPP_FRAME_HANDLER_CTOCPP_H_
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#define CEF_LIBCEF_DLL_CTOCPP_FRAME_HANDLER_CTOCPP_H_
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#pragma once
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#if !defined(BUILDING_CEF_SHARED)
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#error This file can be included DLL-side only
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#endif
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#include "include/capi/cef_frame_handler_capi.h"
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#include "include/cef_frame_handler.h"
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#include "libcef_dll/ctocpp/ctocpp_ref_counted.h"
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// Wrap a C structure with a C++ class.
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// This class may be instantiated and accessed DLL-side only.
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class CefFrameHandlerCToCpp : public CefCToCppRefCounted<CefFrameHandlerCToCpp,
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CefFrameHandler,
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cef_frame_handler_t> {
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public:
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CefFrameHandlerCToCpp();
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virtual ~CefFrameHandlerCToCpp();
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// CefFrameHandler methods.
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void OnFrameCreated(CefRefPtr<CefBrowser> browser,
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CefRefPtr<CefFrame> frame) override;
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void OnFrameAttached(CefRefPtr<CefBrowser> browser,
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CefRefPtr<CefFrame> frame,
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bool reattached) override;
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void OnFrameDetached(CefRefPtr<CefBrowser> browser,
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CefRefPtr<CefFrame> frame) override;
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void OnMainFrameChanged(CefRefPtr<CefBrowser> browser,
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CefRefPtr<CefFrame> old_frame,
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CefRefPtr<CefFrame> new_frame) override;
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};
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#endif // CEF_LIBCEF_DLL_CTOCPP_FRAME_HANDLER_CTOCPP_H_
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