plasma-workspace/kcms/kfontinst/viewpart/FontPreview.cpp

/*
 * KFontInst - KDE Font Installer
 *
 * Copyright 2003-2007 Craig Drummond <craig@kde.org>
 *
 * ----
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "FontPreview.h"
#include "FcEngine.h"
#include "CharTip.h"
#include <QPainter>
#include <QPaintEvent>
#include <QMouseEvent>
#include <QWheelEvent>
#include <stdlib.h>

namespace KFI
{

static const int constBorder=4;
static const int constStepSize=16;

CFontPreview::CFontPreview(QWidget *parent)
            : QWidget(parent),
              itsCurrentFace(1),
              itsLastWidth(0),
              itsLastHeight(0),
              itsStyleInfo(KFI_NO_STYLE_INFO),
              itsTip(nullptr)
{
    itsEngine=new CFcEngine;
}

CFontPreview::~CFontPreview()
{
    delete itsTip;
    delete itsEngine;
}

void CFontPreview::showFont(const QString &name, unsigned long styleInfo,
                            int face)
{
    itsFontName=name;
    itsStyleInfo=styleInfo;
    showFace(face);
}

void CFontPreview::showFace(int face)
{
    itsCurrentFace=face;
    showFont();
}

void CFontPreview::showFont()
{
    itsLastWidth=width()+constStepSize;
    itsLastHeight=height()+constStepSize;

    itsImage=itsEngine->draw(itsFontName, itsStyleInfo, itsCurrentFace,
                             palette().text().color(), palette().base().color(),
                             itsLastWidth, itsLastHeight,
                             false, itsRange, &itsChars);

    if(!itsImage.isNull())
    {
        itsLastChar=CFcEngine::TChar();
        setMouseTracking(itsChars.count()>0);
        update();
        emit status(true);
        emit atMax(itsEngine->atMax());
        emit atMin(itsEngine->atMin());
    }
    else
    {
        itsLastChar=CFcEngine::TChar();
        setMouseTracking(false);
        update();
        emit status(false);
        emit atMax(true);
        emit atMin(true);
    }
}

void CFontPreview::zoomIn()
{
    itsEngine->zoomIn();
    showFont();
    emit atMax(itsEngine->atMax());
}

void CFontPreview::zoomOut()
{
    itsEngine->zoomOut();
    showFont();
    emit atMin(itsEngine->atMin());
}

void CFontPreview::setUnicodeRange(const QList<CFcEngine::TRange> &r)
{
    itsRange=r;
    showFont();
}

void CFontPreview::paintEvent(QPaintEvent *)
{
    QPainter paint(this);

    paint.fillRect(rect(), palette().base());
    if(!itsImage.isNull())
    {

        if(abs(width()-itsLastWidth)>constStepSize || abs(height()-itsLastHeight)>constStepSize)
            showFont();
        else
            paint.drawImage(QPointF(constBorder, constBorder), itsImage,
                            QRectF(0, 0, (width()-(constBorder*2)) * itsImage.devicePixelRatioF(),
                                  (height()-(constBorder*2)) * itsImage.devicePixelRatioF()));
    }
}

void CFontPreview::mouseMoveEvent(QMouseEvent *event)
{
    if(!itsChars.isEmpty())
    {
        QList<CFcEngine::TChar>::ConstIterator end(itsChars.end());

        if(itsLastChar.isNull() || !itsLastChar.contains(event->pos()))
            for(QList<CFcEngine::TChar>::ConstIterator it(itsChars.begin()); it!=end; ++it)
                if((*it).contains(event->pos()))
                {
                    if(!itsTip)
                        itsTip=new CCharTip(this);

                    itsTip->setItem(*it);
                    itsLastChar=*it;
                    break;
                }
    }
}

void CFontPreview::wheelEvent(QWheelEvent *e)
{
    if(e->angleDelta().y()>0)
        zoomIn();
    else if(e->angleDelta().y()<0)
        zoomOut();

    e->accept();
}

QSize CFontPreview::sizeHint() const
{
    return QSize(132, 132);
}

QSize CFontPreview::minimumSizeHint() const
{
    return QSize(32, 32);
}

}