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https://bitbucket.org/chromiumembedded/cef
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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
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// Copyright 2016 The Chromium Embedded Framework Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be found
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// in the LICENSE file.
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#include "libcef/browser/views/layout_util.h"
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#include <utility>
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#include "libcef/browser/views/layout_adapter.h"
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#include "ui/views/view.h"
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namespace layout_util {
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namespace {
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// Manages the association between views::View and CefLayout instances.
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class UserData : public base::SupportsUserData::Data {
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public:
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static CefRefPtr<CefLayout> GetFor(const views::View* view) {
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UserData* data = static_cast<UserData*>(view->GetUserData(UserDataKey()));
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if (data)
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return data->layout_;
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return nullptr;
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}
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// Assign ownership of the underlying views::LayoutManager to |owner_view|.
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// The views::View that owns the views::LayoutManager will gain a ref-counted
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// reference to the CefLayout and the CefLayout will keep an unowned reference
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// to the views::LayoutManager. Destruction of the views::View will release
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// the reference to the CefLayout.
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static void Assign(CefRefPtr<CefLayout> cef_layout,
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views::View* owner_view) {
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DCHECK(owner_view);
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DCHECK(cef_layout->IsValid());
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views::LayoutManager* layout = CefLayoutAdapter::GetFor(cef_layout)->Get();
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DCHECK(layout);
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// The CefLayout previously associated with |owner_view|, if any, will be
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// destroyed by this call.
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owner_view->SetUserData(UserDataKey(), new UserData(cef_layout));
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}
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private:
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explicit UserData(CefRefPtr<CefLayout> cef_layout)
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: layout_(cef_layout) {
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DCHECK(layout_);
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}
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~UserData() override {
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CefLayoutAdapter::GetFor(layout_)->Detach();
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}
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static void* UserDataKey() {
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// We just need a unique constant. Use the address of a static that
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// COMDAT folding won't touch in an optimizing linker.
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static int data_key = 0;
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return reinterpret_cast<void*>(&data_key);
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}
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CefRefPtr<CefLayout> layout_;
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};
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} // namespace
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CefRefPtr<CefLayout> GetFor(const views::View* view) {
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return UserData::GetFor(view);
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}
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void Assign(CefRefPtr<CefLayout> layout, views::View* owner_view) {
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return UserData::Assign(layout, owner_view);
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}
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} // namespace layout_util
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