/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#pragma once

#include <map>

#include <memory>

#include "MasterPageContainer.hxx"

#include <vcl/image.hxx>

#include <vcl/vclptr.hxx>

#include <vcl/virdev.hxx>

#include <vcl/weld/IconView.hxx>

#include <vcl/weld/Menu.hxx>

#include <vcl/idle.hxx>

#include <sfx2/sidebar/PanelLayout.hxx>

#include <osl/mutex.hxx>

namespace com::sun::star::ui { class XSidebar; }

class MouseEvent;

class SdDrawDocument;

class SdPage;

namespace sd {

class ViewShellBase;

}

namespace sd::sidebar {

/** Base class of a menu that lets the user select from a list of

    templates or designs that are loaded from files.

*/

class MasterPagesSelector : public PanelLayout

{

    class UpdateTask final : public Idle

    {

        MasterPagesSelector& m_rContainer;

    public:

        UpdateTask(MasterPagesSelector& rStylesList)

            : Idle("MasterPagesUpdateTask")

            , m_rContainer(rStylesList)

        {

            SetPriority(TaskPriority::DEFAULT_IDLE);

        }

        virtual void Invoke() override { m_rContainer.LateInit(); }

    };

public:

    // Sidebar

    MasterPagesSelector(weld::Widget* pParent, SdDrawDocument& rDocument, ViewShellBase& rBase,

                        std::shared_ptr<MasterPageContainer> pContainer,

                        css::uno::Reference<css::ui::XSidebar> xSidebar,

                        const OUString& rUIFileName, const OUString& rIconViewId);

    // Notebookbar

    MasterPagesSelector(weld::Widget* pParent, SdDrawDocument& rDocument, ViewShellBase& rBase,

                        std::shared_ptr<MasterPageContainer> pContainer,

                        const OUString& rUIFileName, const OUString& rIconViewId);

    virtual ~MasterPagesSelector() override;

    virtual void LateInit();

    /** Make the selector empty.  This method clears the value set from any

        entries. Override this method to add functionality, especially to

        destroy objects set as data items at the value set.

    */

    void ClearPageSet();

    void SetHelpId( const OUString& aId );

    /** Mark the preview that belongs to the given index as not up-to-date

        anymore with respect to page content or preview size.

        The implementation of this method will either synchronously or

        asynchronously call UpdatePreview().

        @param nIndex

            Index into the value set control that is used for displaying the

            previews.

    */

    void InvalidatePreview (const SdPage* pPage);

    void UpdateAllPreviews();

    void ShowContextMenu(const Point& pPos);

    virtual css::ui::LayoutSize GetHeightForWidth (const sal_Int32 nWidth) override;

protected:

    mutable ::osl::Mutex maMutex;

    std::shared_ptr<MasterPageContainer> mpContainer;

    std::unique_ptr<weld::IconView> mxPreviewIconView;

    SdDrawDocument& mrDocument;

    ViewShellBase& mrBase;

    SdPage* GetSelectedMasterPage();

    /** Assign the given master page to all slides of the document.

        @param pMasterPage

            The master page to assign to all slides.

    */

    void AssignMasterPageToAllSlides (SdPage* pMasterPage);

    /** Assign the given master page to all slides that are selected in a

        slide sorter that is displayed in the left or center pane.  When both

        panes display a slide sorter then the one in the center pane is

        used.

    */

    void AssignMasterPageToSelectedSlides (SdPage* pMasterPage);

    void AssignMasterPageToPageList (

        SdPage* pMasterPage,

        const std::shared_ptr<std::vector<SdPage*>>& rPageList);

    virtual void NotifyContainerChangeEvent (const MasterPageContainerChangeEvent& rEvent);

    typedef ::std::pair<int, MasterPageContainer::Token> UserData;

    std::unique_ptr<MasterPagesSelector::UserData> GetUserData(int nIndex) const;

    sal_Int32 GetIndexForToken (MasterPageContainer::Token aToken) const;

    typedef ::std::vector<MasterPageContainer::Token> ItemList;

    void UpdateItemList (::std::unique_ptr<ItemList> && pList);

    void Clear();

    /** Invalidate the specified item so that on the next Fill() this item

        is updated.

    */

    void InvalidateItem (MasterPageContainer::Token aToken);

    // For every item in the ValueSet we store its associated token.  This

    // allows a faster access and easier change tracking.

    ItemList maCurrentItemList;

    typedef ::std::map<MasterPageContainer::Token,sal_Int32> TokenToValueSetIndex;

    TokenToValueSetIndex maTokenToValueSetIndex;

    ItemList maLockedMasterPages;

    /** Lock master pages in the given list and release locks that were

        previously acquired.

    */

    void UpdateLocks (const ItemList& rItemList);

    void Fill();

    virtual void Fill (ItemList& rItemList) = 0;

    /** Give derived classes the opportunity to provide their own context

        menu.  If they do then they probably have to provide their own

        Execute() and GetState() methods as well.

    */

    virtual OUString GetContextMenuUIFile() const;

    virtual void ProcessPopupMenu(weld::Menu& rMenu);

    virtual void ExecuteCommand(const OUString& rIdent);

private:

    css::uno::Reference<css::ui::XSidebar> mxSidebar;

    UpdateTask maUpdateTask;

    /** The offset between ValueSet index and MasterPageContainer::Token

        last seen.  This value is used heuristically to speed up the lookup

        of an index for a token.

    */

    DECL_LINK(MasterPageSelected, const weld::TreeIter&, bool);

    DECL_LINK(CommandHdl, const CommandEvent&, bool);

    DECL_LINK(ContainerChangeListener, MasterPageContainerChangeEvent&, void);

    DECL_LINK(QueryTooltipHdl, const weld::TreeIter&, OUString);

    void SetItem (

        sal_uInt16 nIndex,

        MasterPageContainer::Token aToken);

    void AddTokenToIndexEntry (

        sal_uInt16 nIndex,

        MasterPageContainer::Token aToken);

    void RemoveTokenToIndexEntry (

        sal_uInt16 nIndex,

        MasterPageContainer::Token aToken);

    static ScopedVclPtr<VirtualDevice> GetVirtualDevice(const Image& rPreview);

    static Bitmap GetPreviewAsBitmap(const Image& rPreview);

};

} // end of namespace sd::sidebar

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