/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
 
    This program is Copyright 2000-2008
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <richard.bown@ferventsoftware.com>
 
    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/


#include "TextRuler.h"

#include "base/Event.h"
#include "misc/Debug.h"
#include "misc/Strings.h"
#include "base/NotationTypes.h"
#include "base/RulerScale.h"
#include "base/Segment.h"
#include "gui/general/GUIPalette.h"
#include <tqfont.h>
#include <tqfontmetrics.h>
#include <tqpainter.h>
#include <tqrect.h>
#include <tqsize.h>
#include <tqwidget.h>


namespace Rosegarden
{

TextRuler::TextRuler(RulerScale *rulerScale,
                     Segment *segment,
                     int height,
                     TQWidget *parent,
                     const char *name)
        : TQWidget(parent, name),
        m_height(height),
        m_currentXOffset(0),
        m_width( -1),
        m_segment(segment),
        m_rulerScale(rulerScale),
        m_font("helvetica", 12),
        m_fontMetrics(m_font)
{
    m_mySegmentMaybe = (m_segment->getComposition() != 0);
    setBackgroundColor(GUIPalette::getColour(GUIPalette::TextRulerBackground));

    m_font.setPixelSize(10);
}

TextRuler::~TextRuler()
{
    if (m_mySegmentMaybe && !m_segment->getComposition()) {
        delete m_segment;
    }
}

void
TextRuler::slotScrollHoriz(int x)
{
    int w = width(), h = height();
    int dx = x - ( -m_currentXOffset);
    m_currentXOffset = -x;

    if (dx > w*3 / 4 || dx < -w*3 / 4) {
        update();
        return ;
    }

    if (dx > 0) { // moving right, so the existing stuff moves left
        bitBlt(this, 0, 0, this, dx, 0, w - dx, h);
        repaint(w - dx, 0, dx, h);
    } else {      // moving left, so the existing stuff moves right
        bitBlt(this, -dx, 0, this, 0, 0, w + dx, h);
        repaint(0, 0, -dx, h);
    }
}

TQSize
TextRuler::sizeHint() const
{
    double width =
        m_rulerScale->getBarPosition(m_rulerScale->getLastVisibleBar()) +
        m_rulerScale->getBarWidth(m_rulerScale->getLastVisibleBar());

    TQSize res(std::max(int(width), m_width), m_height);

    return res;
}

TQSize
TextRuler::minimumSizeHint() const
{
    double firstBarWidth = m_rulerScale->getBarWidth(0);
    TQSize res = TQSize(int(firstBarWidth), m_height);
    return res;
}

void
TextRuler::paintEvent(TQPaintEvent* e)
{
    TQPainter paint(this);
    paint.setPen(GUIPalette::getColour(GUIPalette::TextRulerForeground));

    paint.setClipRegion(e->region());
    paint.setClipRect(e->rect().normalize());

    TQRect clipRect = paint.clipRegion().boundingRect();

    timeT from = m_rulerScale->getTimeForX
                 (clipRect.x() - m_currentXOffset - 100);
    timeT to = m_rulerScale->getTimeForX
               (clipRect.x() + clipRect.width() - m_currentXOffset + 100);

    for (Segment::iterator i = m_segment->findTime(from);
            i != m_segment->findTime(to) && i != m_segment->end(); ++i) {

        if (!(*i)->isa(Text::EventType))
            continue;

        std::string text;
        if (!(*i)->get
                <String>(Text::TextPropertyName, text)) {
            RG_DEBUG
            << "Warning: TextRuler::paintEvent: No text in text event"
            << endl;
            continue;
        }

        TQRect bounds = m_fontMetrics.boundingRect(strtoqstr(text));

        double x = m_rulerScale->getXForTime((*i)->getAbsoluteTime()) +
                   m_currentXOffset - bounds.width() / 2;

        int y = height() / 2 + bounds.height() / 2;

        paint.drawText(static_cast<int>(x), y, strtoqstr(text));
    }
}

}
#include "TextRuler.moc"