desktop-example.html

QT 下载资料仅供参考

<a name="x1781"></a>        for( int j = 0 ; j &lt; pm-&gt;<a href="qpixmap.html#height">height</a>() ; j++ ) {
            int r = kindaRand();
            if ( r &lt; KINDA_RAND_MAX / 3 )
<a name="x1779"></a>                p.<a href="qpainter.html#setPen">setPen</a>( p1 );
            else if ( r &lt; KINDA_RAND_MAX / 3 * 2 )
                p.<a href="qpainter.html#setPen">setPen</a>( p2 );
            else
                p.<a href="qpainter.html#setPen">setPen</a>( p3 );
<a name="x1772"></a>            p.<a href="qpainter.html#drawPoint">drawPoint</a>( i,j );
        }
    p.<a href="qpainter.html#end">end</a>();
}

void drawShadeText( <a href="qpainter.html">QPainter</a> *p, int x, int y, const char *text,
                    const <a href="qcolor.html">QColor</a> &amp;topColor, const <a href="qcolor.html">QColor</a> &amp;bottomColor,
                    int sw = 2 )
{
<a name="x1777"></a>    if ( !p-&gt;<a href="qpainter.html#isActive">isActive</a>() )
        return;

    p-&gt;<a href="qpainter.html#setPen">setPen</a>( bottomColor );
<a name="x1774"></a>    p-&gt;<a href="qpainter.html#drawText">drawText</a>( x+sw, y+sw, text );
    p-&gt;<a href="qpainter.html#setPen">setPen</a>( topColor );
    p-&gt;<a href="qpainter.html#drawText">drawText</a>( x, y, text );
}

// NOTE: desktop drag/drop is experimental

class DesktopWidget : public <a href="qwidget.html">QWidget</a>, private QDropSite
{
public:
    DesktopWidget( const char *s, QWidget *parent=0, const char *name=0 );
   ~DesktopWidget();
    void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );

    void dragEnterEvent( <a href="qdragenterevent.html">QDragEnterEvent</a> *e )
    {
<a name="x1769"></a>        if ( QImageDrag::<a href="qimagedrag.html#canDecode">canDecode</a>(e) )
<a name="x1765"></a>            e-&gt;<a href="qdragmoveevent.html#accept">accept</a>();
    }

    void dragLeaveEvent( <a href="qdragleaveevent.html">QDragLeaveEvent</a> * )
    {
    }

    void dragMoveEvent( <a href="qdragmoveevent.html">QDragMoveEvent</a> *e )
    {
        e-&gt;<a href="qdragmoveevent.html#accept">accept</a>();
    }

    void dropEvent( <a href="qdropevent.html">QDropEvent</a> * e )
    {
        <a href="qpixmap.html">QPixmap</a> pmp;
<a name="x1770"></a>        if ( QImageDrag::<a href="qimagedrag.html#decode">decode</a>( e, pmp ) ) {
            <a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( pmp );
            <a href="qwidget.html#update">update</a>();
        }
    }

private:
    <a href="qpixmap.html">QPixmap</a> *pm;
    <a href="qstring.html">QString</a> text;
};

<a name="f489"></a>DesktopWidget::DesktopWidget( const char *s, QWidget *parent, const char *name )
    : <a href="qwidget.html">QWidget</a>( parent, name, WType_Desktop | WPaintDesktop),
        QDropSite(this)
{
    text = s;
    pm   = 0;
}

DesktopWidget::~DesktopWidget()
{
    delete pm;
}

void DesktopWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    <a href="qcolor.html">QColor</a> c1 = <a href="qwidget.html#backgroundColor">backgroundColor</a>();
<a name="x1764"></a>    <a href="qcolor.html">QColor</a> c2 = c1.<a href="qcolor.html#light">light</a>(104);
<a name="x1763"></a>    <a href="qcolor.html">QColor</a> c3 = c1.<a href="qcolor.html#dark">dark</a>(106);
    if ( !pm ) {
        pm = new <a href="qpixmap.html">QPixmap</a>( 64, 64 );
        generateStone( pm, c1, c2, c3 );
        <a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( *pm );
        <a href="qwidget.html#update">update</a>();
    }
    <a href="qrect.html">QRect</a> br = <a href="qwidget.html#fontMetrics">fontMetrics</a>().boundingRect( text );
    <a href="qpixmap.html">QPixmap</a> offscreen( br.<a href="qrect.html#width">width</a>(), br.<a href="qrect.html#height">height</a>() );
    int x = <a href="qwidget.html#width">width</a>()/2  - br.<a href="qrect.html#width">width</a>()/2;
    int y = <a href="qwidget.html#height">height</a>()/2 - br.<a href="qrect.html#height">height</a>()/2;
<a name="x1780"></a>    offscreen.<a href="qpixmap.html#fill">fill</a>( this, x, y );
    <a href="qpainter.html">QPainter</a> p;
    p.<a href="qpainter.html#begin">begin</a>( &amp;offscreen );
<a name="x1796"></a><a name="x1795"></a>    drawShadeText( &amp;p, -br.<a href="qrect.html#x">x</a>(), -br.<a href="qrect.html#y">y</a>(), text, c2, c3, 3 );
    p.<a href="qpainter.html#end">end</a>();
    <a href="qpaintdevice.html#bitBlt-2">bitBlt</a>( this, x, y, &amp;offscreen );
}

void desktopWidget( const char *s = "Trolltech" )
{
    DesktopWidget *t = new DesktopWidget(s);
    t-&gt;<a href="qwidget.html#update">update</a>();
    qApp-&gt;<a href="qapplication.html#exec">exec</a>();
    delete t;
}

void desktopText( const char *s = "Trolltech" )
{
    const int border = 20;

<a name="x1761"></a>    <a href="qcolor.html">QColor</a> c1 =  qApp-&gt;<a href="qapplication.html#palette">palette</a>().inactive().background();
    <a href="qcolor.html">QColor</a> c2 = c1.<a href="qcolor.html#light">light</a>(104);
    <a href="qcolor.html">QColor</a> c3 = c1.<a href="qcolor.html#dark">dark</a>(106);

    <a href="qpixmap.html">QPixmap</a> pm(10,10);

    <a href="qpainter.html">QPainter</a> p;
    p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
<a name="x1776"></a>    <a href="qrect.html">QRect</a> r = p.<a href="qpainter.html#fontMetrics">fontMetrics</a>().boundingRect( s );
    p.<a href="qpainter.html#end">end</a>();

    int appWidth  =  qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;width();
    int appHeight =  qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;height();
    if ( r.<a href="qrect.html#width">width</a>() &gt; appWidth - border*2 )
<a name="x1791"></a>        r.<a href="qrect.html#setWidth">setWidth</a>( appWidth - border*2 );
    if ( r.<a href="qrect.html#height">height</a>() &gt; appHeight - border*2 )
<a name="x1790"></a>        r.<a href="qrect.html#setHeight">setHeight</a>( appHeight - border*2 );

<a name="x1792"></a><a name="x1782"></a>    pm.<a href="qpixmap.html#resize">resize</a>( r.<a href="qrect.html#size">size</a>() + QSize( border*2, border*2 ) );
    generateStone( &amp;pm, c1, c2, c3 );
    p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
    drawShadeText( &amp;p, -r.<a href="qrect.html#x">x</a>() + border, -r.<a href="qrect.html#y">y</a>() + border, s, c2, c3 );
    p.<a href="qpainter.html#end">end</a>();

    qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;setBackgroundPixmap( pm );
}

//
// The program starts here.
//

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

    if ( argc &gt; 1 ) {
        <a href="qfont.html">QFont</a> f( "charter", 96, QFont::Black );
<a name="x1766"></a>        f.<a href="qfont.html#setStyleHint">setStyleHint</a>( QFont::Times );
<a name="x1762"></a>        app.<a href="qapplication.html#setFont">setFont</a>( f );
    }

    bool validOptions = FALSE;

    if ( argc == 2 ) {
        validOptions = TRUE;
        if ( strcmp(argv[1],"-poly") == 0 )
            poly();
        else if ( strcmp(argv[1],"-rotate") == 0 )
            rotate();
        else if ( strcmp(argv[1],"-troll") == 0 )
            desktopText();
        else if ( strcmp(argv[1],"-trollwidget") == 0 )
            desktopWidget();
        else
            validOptions = FALSE;
    }
    if ( argc == 3 ) {
        validOptions = TRUE;
        if ( strcmp(argv[1],"-shadetext") == 0 )
            desktopText( argv[2] );
        else if ( strcmp(argv[1],"-shadewidget") == 0 )
            desktopWidget( argv[2] );
        else
            validOptions = FALSE;
    }
    if ( !validOptions ) {
        fprintf( stderr, "Usage:\n\tdesktop -poly"
                               "\n\tdesktop -rotate"
                               "\n\tdesktop -troll"
                               "\n\tdesktop -trollwidget"
                               "\n\tdesktop -shadetext &lt;text&gt;"
                               "\n\tdesktop -shadewidget &lt;text&gt;\n" );
        rotate();
    }
    return 0;
}
</pre>

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

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