/usr/share/qt3/doc/html/progress-example.html

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<title>Progress Bar and Dialog Example</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Progress Bar and Dialog Example</h1>

   
<p> 
This example displays either a simple (text-only) or a
custom-labelled (user-supplied widget) progress dialog.  It also
demonstrates simple use of menus.
<hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/progress.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 Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include &lt;<a href="qprogressdialog-h.html">qprogressdialog.h</a>&gt;
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
#include &lt;<a href="qpopupmenu-h.html">qpopupmenu.h</a>&gt;
#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;stdlib.h&gt;

class AnimatedThingy : public <a href="qlabel.html">QLabel</a> {
public:
    AnimatedThingy( <a href="qwidget.html">QWidget</a>* parent, const <a href="qstring.html">QString</a>&amp; s ) :
        <a href="qlabel.html">QLabel</a>(parent),
        label(s),
        step(0)
    {
        setBackgroundColor(white);
        label+="\n... and wasting CPU\nwith this animation!\n";

        for (int i=0; i&lt;nqix; i++)
            ox[0][i] = oy[0][i] = ox[1][i] = oy[1][i] = 0;
        x0 = y0 = x1 = y1 = 0;
        dx0 = rand()%8+2;
        dy0 = rand()%8+2;
        dx1 = rand()%8+2;
        dy1 = rand()%8+2;
    }

    void show()
    {
        if (!isVisible()) startTimer(100);
        QWidget::<a href="qwidget.html#show">show</a>();
    }

    void hide()
    {
<a name="x89"></a>        QWidget::<a href="qwidget.html#hide">hide</a>();
        killTimers();
    }

    <a href="qsize.html">QSize</a> sizeHint() const
    {
        return QSize(120,100);
    }

protected:
    void timerEvent(QTimerEvent*)
    {
        <a href="qpainter.html">QPainter</a> p(this);
<a name="x76"></a>        <a href="qpen.html">QPen</a> pn=p.<a href="qpainter.html#pen">pen</a>();
<a name="x80"></a>        pn.<a href="qpen.html#setWidth">setWidth</a>(2);
<a name="x79"></a>        pn.<a href="qpen.html#setColor">setColor</a>(backgroundColor());
<a name="x78"></a>        p.<a href="qpainter.html#setPen">setPen</a>(pn);

        step = (step + 1) % nqix;

<a name="x73"></a>        p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][step], oy[0][step], ox[1][step], oy[1][step]);

        inc(x0, dx0, width());
        inc(y0, dy0, height());
        inc(x1, dx1, width());
        inc(y1, dy1, height());
        ox[0][step] = x0;
        oy[0][step] = y0;
        ox[1][step] = x1;
        oy[1][step] = y1;

        <a href="qcolor.html">QColor</a> c;
<a name="x66"></a>        c.<a href="qcolor.html#setHsv">setHsv</a>( (step*255)/nqix, 255, 255 ); // rainbow effect
        pn.<a href="qpen.html#setColor">setColor</a>(c);
        p.<a href="qpainter.html#setPen">setPen</a>(pn);
        p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][step], oy[0][step], ox[1][step], oy[1][step]);
        p.<a href="qpainter.html#setPen">setPen</a>(colorGroup().text());
<a name="x74"></a>        p.<a href="qpainter.html#drawText">drawText</a>(rect(), AlignCenter, label);
    }

    void paintEvent(QPaintEvent* event)
    {
        <a href="qpainter.html">QPainter</a> p(this);
        <a href="qpen.html">QPen</a> pn=p.<a href="qpainter.html#pen">pen</a>();
        pn.<a href="qpen.html#setWidth">setWidth</a>(2);
        p.<a href="qpainter.html#setPen">setPen</a>(pn);
<a name="x77"></a>        p.<a href="qpainter.html#setClipRect">setClipRect</a>(event-&gt;rect());
        for (int i=0; i&lt;nqix; i++) {
            <a href="qcolor.html">QColor</a> c;
            c.<a href="qcolor.html#setHsv">setHsv</a>( (i*255)/nqix, 255, 255 ); // rainbow effect
            pn.<a href="qpen.html#setColor">setColor</a>(c);
            p.<a href="qpainter.html#setPen">setPen</a>(pn);
            p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][i], oy[0][i], ox[1][i], oy[1][i]);
        }
        p.<a href="qpainter.html#setPen">setPen</a>(colorGroup().text());
        p.<a href="qpainter.html#drawText">drawText</a>(rect(), AlignCenter, label);
    }

private:
    void inc(int&amp; x, int&amp; dx, int b)
    {
        x+=dx;
        if (x&lt;0) { x=0; dx=rand()%8+2; }
        else if (x&gt;=b) { x=b-1; dx=-(rand()%8+2); }
    }

    enum {nqix=10};
    int ox[2][nqix];
    int oy[2][nqix];
    int x0,y0,x1,y1;
    int dx0,dy0,dx1,dy1;
    <a href="qstring.html">QString</a> label;
    int step;
};


class CPUWaster : public <a href="qwidget.html">QWidget</a>
{
    <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>

    enum { first_draw_item = 1000, last_draw_item = 1006 };

    int drawItemRects(int id)
    {
        int n = id - first_draw_item;
        int r = 100;
        while (n--) r*=(n%3 ? 5 : 4);
        return r;
    }
    <a href="qstring.html">QString</a> drawItemText(int id)
    {
        <a href="qstring.html">QString</a> str;
        str.<a href="qstring.html#sprintf">sprintf</a>("%d Rectangles", drawItemRects(id));
        return str;
    }

public:
    CPUWaster() :
        pb(0)
    {
        menubar = new <a href="qmenubar.html">QMenuBar</a>( this, "menu" );
        <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( menubar );

        <a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>();
        <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( file );
        menubar-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "&amp;File", file );
        for (int i=first_draw_item; i&lt;=last_draw_item; i++)
            file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( drawItemText(i), i );
<a name="x67"></a>        connect( menubar, SIGNAL(<a href="qmenubar.html#activated">activated</a>(int)), this, SLOT(doMenuItem(int)) );
<a name="x69"></a>        file-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
        file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Quit", qApp,  SLOT(<a href="qapplication.html#quit">quit</a>()) );

        options = new <a href="qpopupmenu.html">QPopupMenu</a>();
        <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( options );
        menubar-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "&amp;Options", options );
        td_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Timer driven", this, SLOT(timerDriven()) );
        ld_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Loop driven", this, SLOT(loopDriven()) );
        options-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
        dl_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Default label", this, SLOT(defaultLabel()) );
        cl_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Custom label", this, SLOT(customLabel()) );
        options-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
        md_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "No minimum duration", this, SLOT(toggleMinimumDuration()) );
<a name="x81"></a>        options-&gt;<a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
        loopDriven();
        defaultLabel();

        setFixedSize( 400, 300 );

        setBackgroundColor( black );
    }

public slots:
    void doMenuItem(int id)
    {
        if (id &gt;= first_draw_item &amp;&amp; id &lt;= last_draw_item)
            draw(drawItemRects(id));
    }

    void stopDrawing() { got_stop = TRUE; }

    void timerDriven()
    {
        timer_driven = TRUE;
<a name="x71"></a>        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( td_id, TRUE );
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( ld_id, FALSE );
    }

    void loopDriven()
    {
        timer_driven = FALSE;
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( ld_id, TRUE );
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( td_id, FALSE );
    }

    void defaultLabel()
    {
        default_label = TRUE;
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( dl_id, TRUE );
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( cl_id, FALSE );
    }

    void customLabel()
    {
        default_label = FALSE;
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( dl_id, FALSE );
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( cl_id, TRUE );
    }

    void toggleMinimumDuration()
    {
        options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( md_id,
<a name="x70"></a>           !options-&gt;<a href="qmenudata.html#isItemChecked">isItemChecked</a>( md_id ) );
    }

private:
    void timerEvent( <a href="qtimerevent.html">QTimerEvent</a>* )
    {
        if (!got_stop)
<a name="x86"></a><a name="x85"></a>            pb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>( pb-&gt;<a href="qprogressdialog.html#totalSteps">totalSteps</a>() - rects );
        rects--;

        {
            <a href="qpainter.html">QPainter</a> p(this);

            int ww = width();
            int wh = height();

            if ( ww &gt; 8 &amp;&amp; wh &gt; 8 ) {
                <a href="qcolor.html">QColor</a> c(rand()%255, rand()%255, rand()%255);
                int x = rand() % (ww-8);
                int y = rand() % (wh-8);
                int w = rand() % (ww-x);
                int h = rand() % (wh-y);
<a name="x75"></a>                p.<a href="qpainter.html#fillRect">fillRect</a>( x, y, w, h, c );
            }
        }

        if (!rects || got_stop) {
            if (!got_stop)
                pb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>( pb-&gt;<a href="qprogressdialog.html#totalSteps">totalSteps</a>() );
            <a href="qpainter.html">QPainter</a> p(this);
            p.<a href="qpainter.html#fillRect">fillRect</a>(0, 0, width(), height(), backgroundColor());
            enableDrawingItems(TRUE);
            killTimers();
            delete pb;
            pb = 0;
        }
    }

    <a href="qprogressdialog.html">QProgressDialog</a>* newProgressDialog( const char* label, int steps, bool modal )
    {
        <a href="qprogressdialog.html">QProgressDialog</a> *d = new <a href="qprogressdialog.html">QProgressDialog</a>(label, "Cancel", steps, this,
                                                 "progress", modal);
        if ( options-&gt;<a href="qmenudata.html#isItemChecked">isItemChecked</a>( md_id ) )
<a name="x84"></a>            d-&gt;<a href="qprogressdialog.html#setMinimumDuration">setMinimumDuration</a>(0);
        if ( !default_label )
<a name="x83"></a>            d-&gt;<a href="qprogressdialog.html#setLabel">setLabel</a>( new AnimatedThingy(d,label) );
        return d;
    }

    void enableDrawingItems(bool yes)
    {
        for (int i=first_draw_item; i&lt;=last_draw_item; i++) {
<a name="x72"></a>            menubar-&gt;<a href="qmenudata.html#setItemEnabled">setItemEnabled</a>(i, yes);
        }
    }

    void draw(int n)
    {
        if ( timer_driven ) {
            if ( pb ) {
                <a href="qapplication.html#qWarning">qWarning</a>("This cannot happen!");
                return;
            }
            rects = n;
            pb = newProgressDialog("Drawing rectangles.\n"
                                   "Using timer event.", n, FALSE);
            pb-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Please Wait");
<a name="x82"></a>            connect(pb, SIGNAL(<a href="qprogressdialog.html#cancelled">cancelled</a>()), this, SLOT(stopDrawing()));
            enableDrawingItems(FALSE);
            startTimer(0);
            got_stop = FALSE;
        } else {
            <a href="qprogressdialog.html">QProgressDialog</a>* lpb = newProgressDialog(
                        "Drawing rectangles.\nUsing loop.", n, TRUE);
            lpb-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Please Wait");

            <a href="qpainter.html">QPainter</a> p(this);
            for (int i=0; i&lt;n; i++) {
                lpb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>(i);
<a name="x87"></a>                if ( lpb-&gt;<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() )
                    break;

                <a href="qcolor.html">QColor</a> c(rand()%255, rand()%255, rand()%255);
                int x = rand()%(width()-8);
                int y = rand()%(height()-8);
                int w = rand()%(width()-x);
                int h = rand()%(height()-y);
                p.<a href="qpainter.html#fillRect">fillRect</a>(x,y,w,h,c);
            }

            p.<a href="qpainter.html#fillRect">fillRect</a>(0, 0, width(), height(), backgroundColor());

            delete lpb;
        }
    }

    <a href="qmenubar.html">QMenuBar</a>* menubar;
    <a href="qprogressdialog.html">QProgressDialog</a>* pb;
    <a href="qpopupmenu.html">QPopupMenu</a>* options;
    int td_id, ld_id;
    int dl_id, cl_id;
    int md_id;
    int rects;
    bool timer_driven;
    bool default_label;
    bool got_stop;
};

int main( int argc, char **argv )
{
    <a href="qapplication.html">QApplication</a> a( argc, argv );

    int wincount = argc &gt; 1 ? atoi(argv[1]) : 1;

    for ( int i=0; i&lt;wincount; i++ ) {
        CPUWaster* cpuw = new CPUWaster;
        if ( i == 0 ) a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(cpuw);
        cpuw-&gt;<a href="qwidget.html#show">show</a>();
    }
    return a.<a href="qapplication.html#exec">exec</a>();
}

#include "progress.moc"
</pre>

<p>See also <a href="examples.html">Examples</a>.

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qt3-doc 3:3.3.8-b-8ubuntu3 / usr / share / qt3 / doc / html / progress-example.html
