progress-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/progress/progress.doc:4 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Progress Bar and Dialog Example</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><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 acustom-labelled (user-supplied widget) progress dialog. It alsodemonstrates simple use of menus.<hr><p> Implementation:<p> <pre>/****************************************************************************** $Id: qt/progress.cpp 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. 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 <<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">QLabel</a> {public: AnimatedThingy( <a href="qwidget.html">QWidget</a>* parent, const <a href="qstring.html">QString</a>& s ) : <a href="qlabel.html">QLabel</a>(parent), label(s), step(0) { 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); QWidget::<a href="qwidget.html#show">show</a>(); } void hide() {<a name="x57"></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="x44"></a> <a href="qpen.html">QPen</a> pn=p.<a href="qpainter.html#pen">pen</a>();<a name="x48"></a> pn.<a href="qpen.html#setWidth">setWidth</a>(2);<a name="x47"></a> pn.<a href="qpen.html#setColor">setColor</a>(backgroundColor());<a name="x46"></a> p.<a href="qpainter.html#setPen">setPen</a>(pn); step = (step + 1) % nqix;<a name="x41"></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="x34"></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="x42"></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="x45"></a> p.<a href="qpainter.html#setClipRect">setClipRect</a>(event->rect()); for (int i=0; i<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& 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">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-><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="x35"></a> connect( menubar, SIGNAL(<a href="qmenubar.html#activated">activated</a>(int)), this, SLOT(doMenuItem(int)) );<a name="x37"></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>()) );⌨️ 快捷键说明
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