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/* -*- 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/builderfactory.hxx>
#include <vcl/button.hxx>
#include <vcl/layout.hxx>
#include <bitmaps.hlst>
#include "PriorityHBox.hxx"
#include "NotebookbarPopup.hxx"
#include <sfx2/viewfrm.hxx>

#define DUMMY_WIDTH 50
#define BUTTON_WIDTH 30

/*
* PriorityMergedHBox is a VclHBox which hides its own children if there is no sufficient space.
*/

namespace
{
class PriorityMergedHBox : public PriorityHBox
{
private:
    VclPtr<PushButton> m_pButton;
    VclPtr<NotebookbarPopup> m_pPopup;

    DECL_LINK(PBClickHdl, Button*, void);

public:
    explicit PriorityMergedHBox(vcl::Window* pParent)
        : PriorityHBox(pParent)
    {
        m_pButton = VclPtr<PushButton>::Create(this, WB_FLATBUTTON);
        m_pButton->SetClickHdl(LINK(this, PriorityMergedHBox, PBClickHdl));
        m_pButton->SetModeImage(Image(StockImage::Yes, CHEVRON));
        m_pButton->set_width_request(25);
        m_pButton->set_pack_type(VclPackType::End);
        m_pButton->Show();
    }

    virtual ~PriorityMergedHBox() override { disposeOnce(); }

    virtual void Resize() override
    {
        if (!m_bInitialized && SfxViewFrame::Current())
            Initialize();

        if (!m_bInitialized)
        {
            return VclHBox::Resize();
        }

        long nWidth = GetSizePixel().Width();
        long nCurrentWidth = VclHBox::calculateRequisition().getWidth() + BUTTON_WIDTH;

        // Hide lower priority controls
        for (int i = GetChildCount() - 1; i >= 0; i--)
        {
            vcl::Window* pWindow = GetChild(i);

            if (nCurrentWidth <= nWidth)
                break;

            if (pWindow && pWindow->GetParent() == this && pWindow->IsVisible())
            {
                if (pWindow->GetOutputWidthPixel())
                    nCurrentWidth -= pWindow->GetOutputWidthPixel();
                else
                    nCurrentWidth -= DUMMY_WIDTH;
                pWindow->Hide();
            }
        }

        // Show higher priority controls if we already have enough space
        for (int i = 0; i < GetChildCount(); i++)
        {
            vcl::Window* pWindow = GetChild(i);

            if (pWindow->GetParent() != this)<--- Null pointer dereference
            {
                continue;
            }

            if (pWindow && !pWindow->IsVisible())<--- Assuming that condition 'if(pWindow&&!pWindow->IsVisible())' is not redundant
            {
                pWindow->Show();
                nCurrentWidth += getLayoutRequisition(*pWindow).Width() + get_spacing();

                if (nCurrentWidth > nWidth)
                {
                    pWindow->Hide();
                    break;
                }
            }
        }

        VclHBox::Resize();

        if (GetHiddenCount())
            m_pButton->Show();
        else
            m_pButton->Hide();
    }

    virtual void dispose() override
    {
        m_pButton.disposeAndClear();
        if (m_pPopup)
            m_pPopup.disposeAndClear();
        PriorityHBox::dispose();
    }

    int GetHiddenCount() const override
    {
        int nCount = 0;

        for (int i = GetChildCount() - 1; i >= 0; i--)
        {
            vcl::Window* pWindow = GetChild(i);
            if (pWindow && pWindow->GetParent() == this && !pWindow->IsVisible())
                nCount++;
        }

        return nCount;
    }

    Size calculateRequisition() const override
    {
        if (!m_bInitialized)
        {
            return VclHBox::calculateRequisition();
        }

        sal_uInt16 nVisibleChildren = 0;

        Size aSize;
        for (vcl::Window* pChild = GetWindow(GetWindowType::FirstChild); pChild;
             pChild = pChild->GetWindow(GetWindowType::Next))
        {
            if (!pChild->IsVisible())
                continue;
            ++nVisibleChildren;
            Size aChildSize = getLayoutRequisition(*pChild);

            long nPrimaryDimension = getPrimaryDimension(aChildSize);
            nPrimaryDimension += pChild->get_padding() * 2;
            setPrimaryDimension(aChildSize, nPrimaryDimension);

            accumulateMaxes(aChildSize, aSize);
        }

        setPrimaryDimension(aSize, 200);
        return finalizeMaxes(aSize, nVisibleChildren);
    }

    void GetChildrenWithPriorities() override{};
};
}

IMPL_LINK(PriorityMergedHBox, PBClickHdl, Button*, /*pButton*/, void)
{
    if (m_pPopup)
        m_pPopup.disposeAndClear();

    m_pPopup = VclPtr<NotebookbarPopup>::Create(this);

    for (int i = 0; i < GetChildCount(); i++)
    {
        vcl::Window* pWindow = GetChild(i);
        if (pWindow != m_pButton)
        {
            if (!pWindow->IsVisible())
            {
                pWindow->Show();
                pWindow->SetParent(m_pPopup->getBox());
                // count is decreased because we moved child
                i--;
            }
        }
    }

    m_pPopup->hideSeparators(true);

    m_pPopup->getBox()->set_height_request(GetSizePixel().Height());

    long x = m_pButton->GetPosPixel().getX();
    long y = m_pButton->GetPosPixel().getY() + GetSizePixel().Height();
    tools::Rectangle aRect(x, y, x, y);

    m_pPopup->StartPopupMode(aRect, FloatWinPopupFlags::Down | FloatWinPopupFlags::GrabFocus
                                        | FloatWinPopupFlags::AllMouseButtonClose);
}

VCL_BUILDER_FACTORY(PriorityMergedHBox)

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */