cef/libcef/browser/views/layout_impl.h

84 lines
2.7 KiB
C++

// Copyright 2016 The Chromium Embedded Framework Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be found
// in the LICENSE file.
#ifndef CEF_LIBCEF_BROWSER_VIEWS_LAYOUT_IMPL_H_
#define CEF_LIBCEF_BROWSER_VIEWS_LAYOUT_IMPL_H_
#pragma once
#include "include/views/cef_box_layout.h"
#include "include/views/cef_fill_layout.h"
#include "include/views/cef_layout.h"
#include "libcef/browser/thread_util.h"
#include "libcef/browser/views/layout_adapter.h"
#include "libcef/browser/views/layout_util.h"
#include "base/logging.h"
#include "ui/views/layout/layout_manager.h"
#include "ui/views/view.h"
// Base template for implementing CefLayout-derived classes. See comments in
// view_impl.h for a usage overview.
template <class ViewsLayoutClass, class CefLayoutClass>
class CefLayoutImpl : public CefLayoutAdapter,
public CefLayoutClass {
public:
// Returns the underlying views::LayoutManager object as the derived type.
// Does not transfer ownership.
ViewsLayoutClass* layout() const { return layout_ref_; }
// Returns the views::View that owns this object.
views::View* owner_view() const { return owner_view_; }
// CefLayoutAdapter methods:
views::LayoutManager* Get() const override {
return layout();
}
void Detach() override {
owner_view_ = nullptr;
layout_ref_ = nullptr;
}
// CefLayout methods. When adding new As*() methods make sure to update
// CefLayoutAdapter::GetFor() in layout_adapter.cc.
CefRefPtr<CefBoxLayout> AsBoxLayout() override { return nullptr; }
CefRefPtr<CefFillLayout> AsFillLayout() override { return nullptr; }
bool IsValid() override {
CEF_REQUIRE_UIT_RETURN(false);
return !!layout_ref_;
}
protected:
// Create a new implementation object.
// Always call Initialize() after creation.
CefLayoutImpl()
: layout_ref_(nullptr),
owner_view_(nullptr) {
}
// Initialize this object and assign ownership to |owner_view|.
void Initialize(views::View* owner_view) {
DCHECK(owner_view);
owner_view_ = owner_view;
layout_ref_ = CreateLayout();
DCHECK(layout_ref_);
owner_view->SetLayoutManager(layout_ref_);
layout_util::Assign(this, owner_view);
}
// Create the views::LayoutManager object.
virtual ViewsLayoutClass* CreateLayout() = 0;
private:
// Unowned reference to the views::LayoutManager wrapped by this object. Will
// be nullptr after the views::LayoutManager is destroyed.
ViewsLayoutClass* layout_ref_;
// Unowned reference to the views::View that owns this object. Will be nullptr
// after the views::LayoutManager is destroyed.
views::View* owner_view_;
};
#endif // CEF_LIBCEF_BROWSER_VIEWS_LAYOUT_IMPL_H_