/* -*- 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/.
 */

#include "baside2.hxx"

#include <vcl/xtextedt.hxx>
#include <vcl/settings.hxx>

namespace basctl
{

LineNumberWindow::LineNumberWindow (vcl::Window* pParent, ModulWindow* pModulWindow) :
    Window(pParent, WB_BORDER),
    m_pModulWindow(pModulWindow),
    m_nCurYOffset(0)
{
    SetBackground(Wallpaper(GetSettings().GetStyleSettings().GetFieldColor()));
    m_nBaseWidth = GetTextWidth("8");
    m_nWidth = m_nBaseWidth * 3 + m_nBaseWidth / 2;
}

LineNumberWindow::~LineNumberWindow()
{
    disposeOnce();
}

void LineNumberWindow::dispose()
{
    m_pModulWindow.clear();
    Window::dispose();
}

void LineNumberWindow::Paint( vcl::RenderContext& rRenderContext, const tools::Rectangle&)
{
    if(SyncYOffset())
        return;

    ExtTextEngine* txtEngine = m_pModulWindow->GetEditEngine();
    if (!txtEngine)
        return;

    TextView* txtView = m_pModulWindow->GetEditView();
    if (!txtView)
        return;

    GetParent()->Resize();

    int windowHeight = rRenderContext.GetOutputSize().Height();
    int nLineHeight = rRenderContext.GetTextHeight();
    if (!nLineHeight)
    {
        return;
    }

    int startY = txtView->GetStartDocPos().Y();
    const sal_uInt32 nStartLine = startY / nLineHeight + 1;
    sal_uInt32 nEndLine = (startY + windowHeight) / nLineHeight + 1;

    if (txtEngine->GetParagraphCount() + 1 < nEndLine)
        nEndLine = txtEngine->GetParagraphCount() + 1;

    // FIXME: it would be best if we could get notified of a font change
    // rather than doing that re-calculation at each Paint event
    m_nBaseWidth = GetTextWidth("8");

    // reserve enough for 3 digit minimum, with a bit to spare for comfort
    m_nWidth = m_nBaseWidth * 3 + m_nBaseWidth / 2;
    sal_uInt32 i = (nEndLine + 1) / 1000;
    while (i)
    {
        i /= 10;
        m_nWidth += m_nBaseWidth;
    }

    sal_Int64 y = (nStartLine - 1) * (sal_Int64)nLineHeight;
    for (sal_uInt32 n = nStartLine; n <= nEndLine; ++n, y += nLineHeight)
        rRenderContext.DrawText(Point(0, y - m_nCurYOffset), OUString::number(n));
}

void LineNumberWindow::DataChanged(DataChangedEvent const & rDCEvt)
{
    Window::DataChanged(rDCEvt);
    if (rDCEvt.GetType() == DataChangedEventType::SETTINGS
        && (rDCEvt.GetFlags() & AllSettingsFlags::STYLE))
    {
        Color aColor(GetSettings().GetStyleSettings().GetFieldColor());
        const AllSettings* pOldSettings = rDCEvt.GetOldSettings();
        if (!pOldSettings || aColor != pOldSettings->GetStyleSettings().GetFieldColor())
        {
            SetBackground(Wallpaper(aColor));
            Invalidate();
        }
    }
}

void LineNumberWindow::DoScroll(long nVertScroll)
{
    m_nCurYOffset -= nVertScroll;
    Window::Scroll(0, nVertScroll);
}


bool LineNumberWindow::SyncYOffset()
{
    TextView* pView = m_pModulWindow->GetEditView();
    if (!pView)
        return false;

    long nViewYOffset = pView->GetStartDocPos().Y();
    if (m_nCurYOffset == nViewYOffset)
        return false;

    m_nCurYOffset = nViewYOffset;
    Invalidate();
    return true;
}


} // namespace basctl

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