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# Font Displayer

This example program displays all characters of a font.

Header file:

    /****************************************************************************
    ** $Id: qt/fontdisplayer.h   3.3.8   edited Jan 11 14:37 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #ifndef FontDisplayer_H
    #define FontDisplayer_H

    #include <ntqframe.h>
    #include <ntqmainwindow.h>

    class TQSlider;

    class FontRowTable : public TQFrame {
        TQ_OBJECT
    public:
        FontRowTable( TQWidget* parent=0, const char* name=0 );

        TQSize sizeHint() const;

    signals:
        void fontInformation(const TQString&);

    public slots:
        void setRow(int);
        void chooseFont();

    protected:
        TQSize cellSize() const;
        void paintEvent( TQPaintEvent* );
    private:
        TQFont tablefont;
        int row;
    };

    class FontDisplayer : public TQMainWindow {
        TQ_OBJECT
    public:
        FontDisplayer( TQWidget* parent=0, const char* name=0 );
    };

    #endif

Implementation:

    /****************************************************************************
    ** $Id: qt/fontdisplayer.cpp   3.3.8   edited Jan 11 14:37 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "fontdisplayer.h"
    #include <ntqapplication.h>
    #include <ntqslider.h>
    #include <ntqspinbox.h>
    #include <ntqpainter.h>
    #include <ntqtoolbar.h>
    #include <ntqstatusbar.h>
    #include <ntqlabel.h>
    #include <ntqpushbutton.h>
    #include <ntqfontdialog.h>
    #include <stdlib.h>

    FontRowTable::FontRowTable( TQWidget* parent, const char* name ) :
        TQFrame(parent,name)
    {
        setBackgroundMode(PaletteBase);
        setFrameStyle(Panel|Sunken);
        setMargin(8);
        setRow(0);
        tablefont = TQApplication::font();
    }

    TQSize FontRowTable::sizeHint() const
    {
        return 24*cellSize()+TQSize(2,2)*(margin()+frameWidth());
    }

    TQSize FontRowTable::cellSize() const
    {
        TQFontMetrics fm = fontMetrics();
        return TQSize( fm.maxWidth(), fm.lineSpacing()+1 );
    }

    void FontRowTable::paintEvent( TQPaintEvent* e )
    {
        TQFrame::paintEvent(e);
        TQPainter p(this);
        p.setClipRegion(e->region());
        TQRect r = e->rect();
        TQFontMetrics fm = fontMetrics();
        int ml = frameWidth()+margin() + 1 + TQMAX(0,-fm.minLeftBearing());
        int mt = frameWidth()+margin();
        TQSize cell((width()-15-ml)/16,(height()-15-mt)/16);

        if ( !cell.width() || !cell.height() )
            return;

        int mini = r.left() / cell.width();
        int maxi = (r.right()+cell.width()-1) / cell.width();
        int minj = r.top() / cell.height();
        int maxj = (r.bottom()+cell.height()-1) / cell.height();

        int h = fm.height();

        TQColor body(255,255,192);
        TQColor negative(255,192,192);
        TQColor positive(192,192,255);
        TQColor rnegative(255,128,128);
        TQColor rpositive(128,128,255);

        for (int j = minj; j<=maxj; j++) {
            for (int i = mini; i<=maxi; i++) {
                if ( i < 16 && j < 16 ) {
                    int x = i*cell.width();
                    int y = j*cell.height();

                    TQChar ch = TQChar(j*16+i,row);

                    if ( fm.inFont(ch) ) {
                        int w = fm.width(ch);
                        int l = fm.leftBearing(ch);
                        int r = fm.rightBearing(ch);

                        x += ml;
                        y += mt+h;

                        p.fillRect(x,y,w,-h,body);
                        if ( w ) {
                            if ( l ) {
                                p.fillRect(x+(l>0?0:l), y-h/2, abs(l),-h/2,
                                           l < 0 ? negative : positive);
                            }
                            if ( r ) {
                                p.fillRect(x+w-(r>0?r:0),y+2, abs(r),-h/2,
                                           r < 0 ? rnegative : rpositive);
                            }
                        }
                        TQString s;
                        s += ch;
                        p.setPen(TQPen(TQt::black));
                        p.drawText(x,y,s);
                    }
                }
            }
        }
    }

    void FontRowTable::setRow(int r)
    {
        row = r;

        TQFontMetrics fm = fontMetrics();
        TQFontInfo fi = fontInfo();
        TQString str = TQString("%1 %2pt%3%4 mLB=%5 mRB=%6 mW=%7")
                        .arg(fi.family())
                        .arg(fi.pointSize())
                        .arg(fi.bold() ? " bold" : "")
                        .arg(fi.italic() ? " italic" : "")
                        .arg(fm.minLeftBearing())
                        .arg(fm.minRightBearing())
                        .arg(fm.maxWidth());

        emit fontInformation(str);
        update();
    }

    void FontRowTable::chooseFont()
    {
        bool ok;
        TQFont oldfont = tablefont;
        tablefont = TQFontDialog::getFont(&ok, oldfont, this);

        if (ok)
            setFont(tablefont);
        else
            tablefont = oldfont;
    }

    FontDisplayer::FontDisplayer( TQWidget* parent, const char* name ) :
        TQMainWindow(parent,name)
    {
        FontRowTable* table = new FontRowTable(this);
        TQToolBar* controls = new TQToolBar(this);
        (void) new TQLabel(tr("Row:"), controls);
        TQSpinBox *row = new TQSpinBox(0,255,1,controls);
        controls->addSeparator();
        TQPushButton *fontbutton = new TQPushButton(tr("Font..."), controls);

        connect(row,SIGNAL(valueChanged(int)),table,SLOT(setRow(int)));
        connect(fontbutton, SIGNAL(clicked()), table, SLOT(chooseFont()));
        connect(table,SIGNAL(fontInformation(const TQString&)),
                statusBar(),SLOT(message(const TQString&)));
        table->setRow(0);
        setCentralWidget(table);
    }

Main:

    /****************************************************************************
    ** $Id: qt/qfd.cpp   3.3.8   edited Jan 11 14:37 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "fontdisplayer.h"

    #include <ntqapplication.h>
    #include <ntqslider.h>
    #include <ntqpainter.h>
    #include <ntqstatusbar.h>

    int main(int argc, char** argv)
    {
        TQApplication app(argc,argv);

        FontDisplayer m;
        TQSize sh = m.centralWidget()->sizeHint();
        m.resize(sh.width(),
                 sh.height()+3*m.statusBar()->height());
        app.setMainWidget(&m);
        m.setCaption("TQt Example - TQFD");
        m.show();

        return app.exec();
    }

See also Examples.