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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.
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< 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 TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include < < a href = "qprogressdialog-h.html" > qprogressdialog.h< / a > >
#include < < a href = "qapplication-h.html" > qapplication.h< / a > >
#include < < a href = "qmenubar-h.html" > qmenubar.h< / a > >
#include < < a href = "qpopupmenu-h.html" > qpopupmenu.h< / a > >
#include < < a href = "qpainter-h.html" > qpainter.h< / a > >
#include < stdlib.h>
class AnimatedThingy : public < a href = "qlabel.html" > TQLabel< / a > {
public:
AnimatedThingy( < a href = "qwidget.html" > TQWidget< / a > * parent, const < a href = "qstring.html" > TQString< / a > & s ) :
< a href = "qlabel.html" > TQLabel< / a > (parent),
label(s),
step(0)
{
setBackgroundColor(white);
label+="\n... and wasting CPU\nwith this animation!\n";
for (int i=0; i< 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);
TQWidget::< a href = "qwidget.html#show" > show< / a > ();
}
void hide()
{
< a name = "x89" > < / a > TQWidget::< a href = "qwidget.html#hide" > hide< / a > ();
killTimers();
}
< a href = "qsize.html" > TQSize< / a > sizeHint() const
{
return TQSize(120,100);
}
protected:
void timerEvent(TQTimerEvent*)
{
< a href = "qpainter.html" > TQPainter< / a > p(this);
< a name = "x76" > < / a > < a href = "qpen.html" > TQPen< / 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" > TQColor< / 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(TQPaintEvent* event)
{
< a href = "qpainter.html" > TQPainter< / a > p(this);
< a href = "qpen.html" > TQPen< / 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-> rect());
for (int i=0; i< nqix; i++) {
< a href = "qcolor.html" > TQColor< / 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& x, int& dx, int b)
{
x+=dx;
if (x< 0) { x=0; dx=rand()%8+2; }
else if (x> =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" > TQString< / a > label;
int step;
};
class CPUWaster : public < a href = "qwidget.html" > TQWidget< / 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" > TQString< / a > drawItemText(int id)
{
< a href = "qstring.html" > TQString< / 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" > TQMenuBar< / a > ( this, "menu" );
< a href = "qapplication.html#Q_CHECK_PTR" > Q_CHECK_PTR< / a > ( menubar );
< a href = "qpopupmenu.html" > TQPopupMenu< / a > * file = new < a href = "qpopupmenu.html" > TQPopupMenu< / a > ();
< a href = "qapplication.html#Q_CHECK_PTR" > Q_CHECK_PTR< / a > ( file );
menubar-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "& File", file );
for (int i=first_draw_item; i< =last_draw_item; i++)
file-> < 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-> < a href = "qmenudata.html#insertSeparator" > insertSeparator< / a > ();
file-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "Quit", qApp, SLOT(< a href = "qapplication.html#quit" > quit< / a > ()) );
options = new < a href = "qpopupmenu.html" > TQPopupMenu< / a > ();
< a href = "qapplication.html#Q_CHECK_PTR" > Q_CHECK_PTR< / a > ( options );
menubar-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "& Options", options );
td_id = options-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "Timer driven", this, SLOT(timerDriven()) );
ld_id = options-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "Loop driven", this, SLOT(loopDriven()) );
options-> < a href = "qmenudata.html#insertSeparator" > insertSeparator< / a > ();
dl_id = options-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "Default label", this, SLOT(defaultLabel()) );
cl_id = options-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "Custom label", this, SLOT(customLabel()) );
options-> < a href = "qmenudata.html#insertSeparator" > insertSeparator< / a > ();
md_id = options-> < a href = "qmenudata.html#insertItem" > insertItem< / a > ( "No minimum duration", this, SLOT(toggleMinimumDuration()) );
< a name = "x81" > < / a > options-> < a href = "qpopupmenu.html#setCheckable" > setCheckable< / a > ( TRUE );
loopDriven();
defaultLabel();
setFixedSize( 400, 300 );
setBackgroundColor( black );
}
public slots:
void doMenuItem(int id)
{
if (id > = first_draw_item & & id < = last_draw_item)
draw(drawItemRects(id));
}
void stopDrawing() { got_stop = TRUE; }
void timerDriven()
{
timer_driven = TRUE;
< a name = "x71" > < / a > options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( td_id, TRUE );
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( ld_id, FALSE );
}
void loopDriven()
{
timer_driven = FALSE;
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( ld_id, TRUE );
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( td_id, FALSE );
}
void defaultLabel()
{
default_label = TRUE;
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( dl_id, TRUE );
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( cl_id, FALSE );
}
void customLabel()
{
default_label = FALSE;
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( dl_id, FALSE );
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( cl_id, TRUE );
}
void toggleMinimumDuration()
{
options-> < a href = "qmenudata.html#setItemChecked" > setItemChecked< / a > ( md_id,
< a name = "x70" > < / a > !options-> < a href = "qmenudata.html#isItemChecked" > isItemChecked< / a > ( md_id ) );
}
private:
void timerEvent( < a href = "qtimerevent.html" > TQTimerEvent< / a > * )
{
if (!got_stop)
< a name = "x86" > < / a > < a name = "x85" > < / a > pb-> < a href = "qprogressdialog.html#setProgress" > setProgress< / a > ( pb-> < a href = "qprogressdialog.html#totalSteps" > totalSteps< / a > () - rects );
rects--;
{
< a href = "qpainter.html" > TQPainter< / a > p(this);
int ww = width();
int wh = height();
if ( ww > 8 & & wh > 8 ) {
< a href = "qcolor.html" > TQColor< / 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-> < a href = "qprogressdialog.html#setProgress" > setProgress< / a > ( pb-> < a href = "qprogressdialog.html#totalSteps" > totalSteps< / a > () );
< a href = "qpainter.html" > TQPainter< / 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" > TQProgressDialog< / a > * newProgressDialog( const char* label, int steps, bool modal )
{
< a href = "qprogressdialog.html" > TQProgressDialog< / a > *d = new < a href = "qprogressdialog.html" > TQProgressDialog< / a > (label, "Cancel", steps, this,
"progress", modal);
if ( options-> < a href = "qmenudata.html#isItemChecked" > isItemChecked< / a > ( md_id ) )
< a name = "x84" > < / a > d-> < a href = "qprogressdialog.html#setMinimumDuration" > setMinimumDuration< / a > (0);
if ( !default_label )
< a name = "x83" > < / a > d-> < a href = "qprogressdialog.html#setLabel" > setLabel< / a > ( new AnimatedThingy(d,label) );
return d;
}
void enableDrawingItems(bool yes)
{
for (int i=first_draw_item; i< =last_draw_item; i++) {
< a name = "x72" > < / a > menubar-> < 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-> < 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" > TQProgressDialog< / a > * lpb = newProgressDialog(
"Drawing rectangles.\nUsing loop.", n, TRUE);
lpb-> < a href = "qwidget.html#setCaption" > setCaption< / a > ("Please Wait");
< a href = "qpainter.html" > TQPainter< / a > p(this);
for (int i=0; i< n; i++) {
lpb-> < a href = "qprogressdialog.html#setProgress" > setProgress< / a > (i);
< a name = "x87" > < / a > if ( lpb-> < a href = "qprogressdialog.html#wasCancelled" > wasCancelled< / a > () )
break;
< a href = "qcolor.html" > TQColor< / 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" > TQMenuBar< / a > * menubar;
< a href = "qprogressdialog.html" > TQProgressDialog< / a > * pb;
< a href = "qpopupmenu.html" > TQPopupMenu< / 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" > TQApplication< / a > a( argc, argv );
int wincount = argc > 1 ? atoi(argv[1]) : 1;
for ( int i=0; i< wincount; i++ ) {
CPUWaster* cpuw = new CPUWaster;
if ( i == 0 ) a.< a href = "qapplication.html#setMainWidget" > setMainWidget< / a > (cpuw);
cpuw-> < 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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