/* -*- 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 .

 */

#include <vcl/status.hxx>

#include <vcl/image.hxx>

#include <vcl/timer.hxx>

#include <vcl/idle.hxx>

#include <vcl/event.hxx>

#include <svl/eitem.hxx>

#include <tools/debug.hxx>

#include <svx/strings.hrc>

#include <svx/modctrl.hxx>

#include <svx/dialmgr.hxx>

#include <com/sun/star/beans/PropertyValue.hpp>

#include "modctrl_internal.hxx"

#include <bitmaps.hlst>

using ::com::sun::star::uno::Sequence;

using ::com::sun::star::beans::PropertyValue;

SFX_IMPL_STATUSBAR_CONTROL(SvxModifyControl, SfxBoolItem);

struct SvxModifyControl::ImplData

{

    enum ModificationState

    {

        MODIFICATION_STATE_NO = 0,

        MODIFICATION_STATE_YES,

        MODIFICATION_STATE_FEEDBACK,

        MODIFICATION_STATE_SIZE

    };

    Idle  maIdle { "svx::SvxModifyControl maIdle" };

    Image maImages[MODIFICATION_STATE_SIZE];

    ModificationState mnModState;

    ImplData():

        mnModState(MODIFICATION_STATE_NO)

    {

        maImages[MODIFICATION_STATE_NO]       = Image(StockImage::Yes, RID_SVXBMP_DOC_MODIFIED_NO);

        maImages[MODIFICATION_STATE_YES]      = Image(StockImage::Yes, RID_SVXBMP_DOC_MODIFIED_YES);

        maImages[MODIFICATION_STATE_FEEDBACK] = Image(StockImage::Yes, RID_SVXBMP_DOC_MODIFIED_FEEDBACK);

        maIdle.SetPriority(TaskPriority::LOWEST);

    }

};

SvxModifyControl::SvxModifyControl( sal_uInt16 _nSlotId, sal_uInt16 _nId, StatusBar& rStb ) :

    SfxStatusBarControl( _nSlotId, _nId, rStb ),

    mxImpl(std::make_shared<ImplData>())

{

    mxImpl->maIdle.SetInvokeHandler( LINK(this, SvxModifyControl, OnTimer) );

}

void SvxModifyControl::StateChangedAtStatusBarControl( sal_uInt16, SfxItemState eState,

                                     const SfxPoolItem* pState )

{

    if ( SfxItemState::DEFAULT != eState )

        return;

    DBG_ASSERT( dynamic_cast<const SfxBoolItem*>( pState) !=  nullptr, "invalid item type" );

    const SfxBoolItem* pItem = static_cast<const SfxBoolItem*>(pState);

    mxImpl->maIdle.Stop();

    bool modified = pItem->GetValue();

    bool start = ( !modified && mxImpl->mnModState == ImplData::MODIFICATION_STATE_YES);  // should timer be started and feedback image displayed ?

    mxImpl->mnModState = (start ? ImplData::MODIFICATION_STATE_FEEDBACK : (modified ? ImplData::MODIFICATION_STATE_YES : ImplData::MODIFICATION_STATE_NO));

    _repaint();

    TranslateId pResId = modified ? RID_SVXSTR_DOC_MODIFIED_YES : RID_SVXSTR_DOC_MODIFIED_NO;

    GetStatusBar().SetQuickHelpText(GetId(), SvxResId(pResId));

    if ( start )

        mxImpl->maIdle.Start();

}

IMPL_LINK( SvxModifyControl, OnTimer, Timer *, pTimer, void )

{

    if (pTimer == nullptr)

        return;

    pTimer->Stop();

    mxImpl->mnModState = ImplData::MODIFICATION_STATE_NO;

    _repaint();

}

void SvxModifyControl::_repaint()

{

    GetStatusBar().SetItemData( GetId(), nullptr );    // force repaint

}

/**

 * Given a bounding rectangle and an image, determine the top-left position

 * of the image so that the image would look centered both horizontally and

 * vertically.

 *

 * @param rBoundingRect bounding rectangle

 * @param rImg image

 *

 * @return Point top-left corner of the centered image position

 */

Point centerImage(const tools::Rectangle& rBoundingRect, const Image& rImg)

{

    Size aImgSize = rImg.GetSizePixel();

    Size aRectSize = rBoundingRect.GetSize();

    tools::Long nXOffset = (aRectSize.getWidth() - aImgSize.getWidth())/2;

    tools::Long nYOffset = (aRectSize.getHeight() - aImgSize.getHeight())/2;

    Point aPt = rBoundingRect.TopLeft();

    aPt += Point(nXOffset, nYOffset);

    return aPt;

}

void SvxModifyControl::Paint( const UserDrawEvent& rUsrEvt )

{

    vcl::RenderContext* pDev = rUsrEvt.GetRenderContext();

    tools::Rectangle aRect(rUsrEvt.GetRect());

    ImplData::ModificationState state = mxImpl->mnModState;

    Point aPt = centerImage(aRect, mxImpl->maImages[state]);

    pDev->DrawImage(aPt, mxImpl->maImages[state]);

}

void SvxModifyControl::Click()

{

    if (mxImpl->mnModState != ImplData::MODIFICATION_STATE_YES)

        // document not modified.  nothing to do here.

        return;

    Sequence<PropertyValue> aArgs;

    execute(u".uno:Save"_ustr, aArgs);

}

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