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diff --git a/doc/html/grapher-nsplugin-example.html b/doc/html/grapher-nsplugin-example.html new file mode 100644 index 0000000..9578a53 --- /dev/null +++ b/doc/html/grapher-nsplugin-example.html @@ -0,0 +1,704 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/nsplugin/examples/grapher/grapher.doc:1 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>Grapher Plugin</title> +<style type="text/css"><!-- +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>Grapher Plugin</h1> + + + +<p> This example graphs data from a simple text file. It +demonstrates the use of the <a href="qnpinstance.html#writeReady">QNPInstance::writeReady</a>() +and <a href="qnpinstance.html#write">QNPInstance::write</a>() functions. +<p> To build the example, you must first build the +<a href=nsplugin.html>Qt Netscape Plugin Extension</a> library. +Then type <tt>make</tt> in <tt>extensions/nsplugin/examples/grapher/</tt> +and copy the resulting <tt>grapher.so</tt> or <tt>npgrapher.dll</tt> +to the Plugins directory of your WWW browser. +<p> <EMBED ALIGN=LEFT WIDTH=49% HEIGHT=300 SRC=graph.g1n +graphstyle=pie fontfamily=times fontsize=18> +<p> The text file it accepts as input has a title line, then +a sequence of lines with a number, then a string. The +plugin displays a pie chart of the numbers, each segment +labelled by the associated string. The user can select +a bar chart view of the same data by selecting from the +menu that appears when they point at the plugin. +<p> The HTML tag used to embed the graph is: +<small> +<pre> + <EMBED + SRC=graph.g1n + ALIGN=LEFT + WIDTH=49% HEIGHT=300 + graphstyle=pie fontfamily=times + fontsize=18> +</pre><p> </small> +Note that some HTML arguments (which we have capitalized here) +are interpreted by the browser, while others are used by the +plugin. +<p> <br clear> +With the simplicity and cross-platform nature of Qt-based plugins, +pages like <a href="http://www.netcraft.com/survey/">Netcraft's +Server Graphs</a> can be provided much more efficiently for both +the service provider and consumer. Data need not be converted +to an image at the server. +<p> <br clear> +<hr> +Implementation: +<p> <pre>// Include Qt Netscape Plugin classes. +#include "qnp.h" + +// Include other Qt classes. +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qtextstream-h.html">qtextstream.h</a>> +#include <<a href="qbuffer-h.html">qbuffer.h</a>> +#include <<a href="qpixmap-h.html">qpixmap.h</a>> +#include <<a href="qmenubar-h.html">qmenubar.h</a>> +#include <<a href="qpushbutton-h.html">qpushbutton.h</a>> +#include <<a href="qptrlist-h.html">qptrlist.h</a>> +#include <<a href="qmessagebox-h.html">qmessagebox.h</a>> + +// Include some C library functions. +#include <math.h> +#include <stdlib.h> + +#ifndef M_PI // Some math.h don't include this. +#define M_PI 3.14159265358979323846264338327950288 +#endif + + + +// +// GraphModel is a simple abstract class that describes +// a table of numeric and text data. +// + +class GraphModel { +public: + enum ColType { Numeric, Label }; + + union Datum { + double dbl; + <a href="qstring.html">QString</a>* str; + }; + + virtual QPtrList<Datum>& graphData()=0; + virtual ColType colType(int col) const=0; + virtual int nCols() const=0; +}; + + +// +// Graph is a widget subclass that displays a GraphModel. +// Since the widget is a QNPWidget, it can be used as a plugin window, +// returned by Grapher::newWindow() below. +// + +class Graph : public <a href="qnpwidget.html">QNPWidget</a> { + <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> +public: + // Constructs a Graph to display a GraphModel + // + Graph(GraphModel&); + ~Graph(); + + // Two styles are available - Pie and Bar graph + // + enum Style { Pie, Bar }; + static const char* styleName[]; + void setStyle(Style); + void setStyle(const char*); + + // Timer event processing rotates the pie graph + // + void timerEvent(QTimerEvent*); + + // These functions are provided by QNPWidget - we override + // them to hide and show the plugin menubar. + // + void enterInstance(); + void leaveInstance(); + + // Paint the graph... + // + void paintEvent(QPaintEvent*); + // + // ... as either a "Loading" message, a Bar graph, a Pie graph, + // or an error message. + // + void paintWait(QPaintEvent*); + void paintBar(QPaintEvent*); + void paintPie(QPaintEvent*); + void paintError(const char*); + +signals: + // Signals emitted when the Help menus are selected. + void aboutPlugin(); + void aboutData(); + +private: + GraphModel& model; + <a href="qmenubar.html">QMenuBar</a> *menubar; + Style style; + <a href="qpopupmenu.html">QPopupMenu</a>* stylemenu; + int pieRotationTimer; + int pieRotation; + <a href="qpixmap.html">QPixmap</a> pm; + +private slots: + void setStyleFromMenu(int id); +}; + + +<a name="f564"></a>Graph::Graph( GraphModel& mdl ) : + model(mdl), + <a href="qwidget.html#style">style</a>(Bar), + pieRotationTimer(0), + pieRotation(0) +{ + // Create a menubar for the widget + // + menubar = new <a href="qmenubar.html">QMenuBar</a>( this ); + stylemenu = new <a href="qpopupmenu.html">QPopupMenu</a>; +<a name="x2768"></a> stylemenu-><a href="qpopupmenu.html#setCheckable">setCheckable</a>(TRUE); + for ( Style s = Pie; styleName[s]; s = Style(s+1)) { + stylemenu-><a href="qmenudata.html#insertItem">insertItem</a>(styleName[s], s+100); + } +<a name="x2767"></a> <a href="qobject.html#connect">connect</a>(stylemenu, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), + this, SLOT(setStyleFromMenu(int))); + <a href="qwidget.html#setStyle">setStyle</a>(Pie); + + menubar-><a href="qmenudata.html#insertItem">insertItem</a>("Style", stylemenu); + menubar-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + + <a href="qpopupmenu.html">QPopupMenu</a>* help = new <a href="qpopupmenu.html">QPopupMenu</a>; + help-><a href="qmenudata.html#insertItem">insertItem</a>( "About plugin...", this, SIGNAL(aboutPlugin()) ); + help-><a href="qmenudata.html#insertItem">insertItem</a>( "About data...", this, SIGNAL(aboutData()) ); + menubar-><a href="qmenudata.html#insertItem">insertItem</a>("Help", help); +<a name="x2745"></a> menubar-><a href="qmenubar.html#hide">hide</a>(); +} + +Graph::~Graph() +{ +} + +<a name="x2778"></a>void Graph::<a href="qwidget.html#setStyle">setStyle</a>(Style s) +{ + if (style != s) { + if (pieRotationTimer) + <a href="qobject.html#killTimer">killTimer</a>(pieRotationTimer); +<a name="x2749"></a> stylemenu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(100+style, FALSE); + style = s; + if ( style == Pie ) + pieRotationTimer = <a href="qobject.html#startTimer">startTimer</a>( 80 ); + else + pieRotationTimer = 0; + stylemenu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(100+style, TRUE); + <a href="qwidget.html#update">update</a>(); + } +} + +<a name="x2755"></a>void Graph::<a href="qobject.html#timerEvent">timerEvent</a>(QTimerEvent*) +{ + pieRotation = ( pieRotation + 6 ) % 360; repaint(FALSE); +} + +void Graph::<a href="qwidget.html#setStyle">setStyle</a>(const char* stext) +{ + for ( Style s = Pie; styleName[s]; s = Style(s+1) ) { + if ( <a href="qcstring.html#qstricmp">qstricmp</a>(stext,styleName[s])==0 ) { + <a href="qwidget.html#setStyle">setStyle</a>(s); + return; + } + } +} + +<a name="x2753"></a>void Graph::<a href="qnpwidget.html#enterInstance">enterInstance</a>() +{ +<a name="x2746"></a> menubar-><a href="qmenubar.html#show">show</a>(); +} + +<a name="x2754"></a>void Graph::<a href="qnpwidget.html#leaveInstance">leaveInstance</a>() +{ + menubar-><a href="qmenubar.html#hide">hide</a>(); +} + +void <a name="f565"></a>Graph::paintError(const char* e) +{ + <a href="qpainter.html">QPainter</a> p(this); + int w = <a href="qwidget.html#width">width</a>(); +<a name="x2760"></a> p.<a href="qpainter.html#drawText">drawText</a>(w/8, 0, w-w/4, height(), AlignCenter|WordBreak, e); +} + +void <a name="f566"></a>Graph::paintBar(QPaintEvent* event) +{ + if ( model.colType(0) != GraphModel::Numeric ) { + paintError("First column not numeric, cannot draw bar graph\n"); + return; + } + + <a href="qptrlist.html">QPtrList</a><GraphModel::Datum>& data = model.graphData(); + + double max = 0.0; + +<a name="x2772"></a> for (GraphModel::Datum* rowdata = data.<a href="qptrlist.html#first">first</a>(); +<a name="x2773"></a> rowdata; rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + if (rowdata[0].dbl > max) max = rowdata[0].dbl; + } + + const uint w = <a href="qwidget.html#width">width</a>(); + const uint h = <a href="qwidget.html#height">height</a>(); + + <a href="qpainter.html">QPainter</a> p(this); + +<a name="x2762"></a> p.<a href="qpainter.html#setClipRect">setClipRect</a>(event->rect()); + +<a name="x2771"></a> if ( w > data.<a href="qptrlist.html#count">count</a>() ) { + // More pixels than data + int x = 0; + int i = 0; + <a href="qfontmetrics.html">QFontMetrics</a> fm=<a href="qwidget.html#fontMetrics">fontMetrics</a>(); +<a name="x2741"></a> int fh = fm.<a href="qfontmetrics.html#height">height</a>(); + + for (GraphModel::Datum* rowdata = data.<a href="qptrlist.html#first">first</a>(); + rowdata; rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + <a href="qcolor.html">QColor</a> c; +<a name="x2740"></a> c.<a href="qcolor.html#setHsv">setHsv</a>( (i * 255)/data.<a href="qptrlist.html#count">count</a>(), 255, 255 );// rainbow effect + p.<a href="qpainter.html#setBrush">setBrush</a>(c); + int bw = (w-w/4-x)/(data.<a href="qptrlist.html#count">count</a>()-i); + int bh = int((h-h/4-1)*rowdata[0].dbl/max); + p.<a href="qpainter.html#drawRect">drawRect</a>( w/8+x, h-h/8-1-bh, bw, bh ); + + i++; + x+=bw; + } + } else { + // More data than pixels + int x = 0; + int i = 0; + double av = 0.0; + int n = 0; + for (GraphModel::Datum* rowdata = data.<a href="qptrlist.html#first">first</a>(); rowdata; + rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + int bx = i*w/data.<a href="qptrlist.html#count">count</a>(); + + if (bx > x) { + <a href="qcolor.html">QColor</a> c; + c.<a href="qcolor.html#setHsv">setHsv</a>( (x * 255)/w, 255, 255 );// rainbow effect + p.<a href="qpainter.html#setPen">setPen</a>(c); + int bh = int(h*av/n/max); + + p.<a href="qpainter.html#drawLine">drawLine</a>(x,h-1,x,h-bh); + + av = 0.0; + n = 0; + x = bx; + } + + av += rowdata[0].dbl; + n++; + + i++; + } + } +} + +void <a name="f567"></a>Graph::paintPie(QPaintEvent* event) +{ + if ( model.colType(0) != GraphModel::Numeric ) { + paintError("First column not numeric, cannot draw pie graph\n"); + return; + } + + <a href="qptrlist.html">QPtrList</a><GraphModel::Datum>& data = model.graphData(); + + double total = 0.0; + + GraphModel::Datum* rowdata; + + for (rowdata = data.<a href="qptrlist.html#first">first</a>(); + rowdata; rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + total += rowdata[0].dbl; + } + + // Only use first column for pie chart + if ( !total ) return; + + int apos = (pieRotation-90)*16; + + const int w = <a href="qwidget.html#width">width</a>(); + const int h = <a href="qwidget.html#height">height</a>(); + + const int xd = w - w/5; + const int yd = h - h/5; + +<a name="x2766"></a> pm.<a href="qpixmap.html#resize">resize</a>(<a href="qwidget.html#width">width</a>(),height()); +<a name="x2765"></a> pm.<a href="qpixmap.html#fill">fill</a>(<a href="qwidget.html#backgroundColor">backgroundColor</a>()); + <a href="qpainter.html">QPainter</a> p(&pm); +<a name="x2763"></a> p.<a href="qpainter.html#setFont">setFont</a>(<a href="qwidget.html#font">font</a>()); + + p.<a href="qpainter.html#setClipRect">setClipRect</a>(event->rect()); + + int i = 0; + + for (rowdata = data.<a href="qptrlist.html#first">first</a>(); + rowdata; rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + <a href="qcolor.html">QColor</a> c; + + c.<a href="qcolor.html#setHsv">setHsv</a>( ( i * 255)/data.<a href="qptrlist.html#count">count</a>(), 255, 255 );// rainbow effect + p.<a href="qpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c + + int a = int(( rowdata[0].dbl * 360.0 ) / total * 16.0 + 0.5); +<a name="x2757"></a> p.<a href="qpainter.html#drawPie">drawPie</a>( w/10, h/10, xd, yd, -apos, -a ); + apos += a; + i++; + } + + if (model.colType(1) == GraphModel::Label) { + double apos = (pieRotation-90)*M_PI/180; + + for (rowdata = data.<a href="qptrlist.html#first">first</a>(); + rowdata; rowdata = data.<a href="qptrlist.html#next">next</a>()) + { + double a = rowdata[0].dbl * 360 / total * M_PI / 180; + int x = int(cos(apos+a/2)*w*5/16 + w/2 + 0.5); + int y = int(sin(apos+a/2)*h*5/16 + h/2 + 0.5); + + // ### This causes a crash, so comment out for now + /*p.<a href="qpainter.html#drawText">drawText</a>(x-w/8, y-h/8, w/4, h/4, + WordBreak|AlignCenter, + *rowdata[1].str);*/ + apos += a; + } + } + + <a href="qpainter.html">QPainter</a> p2(this); + p2.<a href="qpainter.html#setClipRect">setClipRect</a>(event->rect()); +<a name="x2758"></a> p2.<a href="qpainter.html#drawPixmap">drawPixmap</a>(0,0,pm); +} + +void <a name="f568"></a>Graph::paintWait(QPaintEvent*) +{ + <a href="qpainter.html">QPainter</a> p(this); + p.<a href="qpainter.html#drawText">drawText</a>(rect(), AlignCenter, "Loading..."); +} + +void Graph::<a href="qwidget.html#paintEvent">paintEvent</a>(QPaintEvent* event) +{ + if (!model.nCols()) { + paintWait(event); + } else { + switch (style) { + case Pie: + paintPie(event); + break; + case Bar: + paintBar(event); + break; + } + } +} + +void <a name="f569"></a>Graph::setStyleFromMenu(int id) +{ + setStyle(Style(id-100)); +} + +const char* Graph::styleName[] = { "Pie", "Bar", 0 }; + + +// +// Grapher is a subclass of QNPInstance, and so it can be returned +// by GrapherPlugin::newInstance(). A QNPInstance represents the +// plugin, distinctly from the plugin window. +// +// Grapher is also a GraphModel, because it loads graph data from +// the net. When Grapher creates a window in newWindow(), it creates +// a Graph widget to display the GraphModel that is the Grapher itself. +// + +class Grapher : public <a href="qnpinstance.html">QNPInstance</a>, GraphModel { + Q_OBJECT +public: + // Create a Grapher - all Grapher plugins are created + // by one GrapherPlugin object. + // + Grapher(); + ~Grapher(); + + // We override this QNPInstance function to create our + // own subclass of QNPWidget, a Graph widget. + // + <a href="qnpwidget.html">QNPWidget</a>* newWindow(); + + // We override this QNPInstance function to process the + // incoming graph data. + // + int write(QNPStream* /*str*/, int /*offset*/, int len, void* buffer); + +private: + // Grapher is a GraphModel, so it implements the pure virtual + // functions of that class. + // + <a href="qptrlist.html">QPtrList</a><Datum>& graphData(); + ColType colType(int col) const; + int nCols() const; + + void consumeLine(); + <a href="qptrlist.html">QPtrList</a><Datum> data; + <a href="qbuffer.html">QBuffer</a> line; + int ncols; + ColType *coltype; + +private slots: + // Slots that are connected to the Graph menu items. + // + void aboutPlugin(); + void aboutData(); +}; + +<a name="f570"></a>Grapher::Grapher() +{ +<a name="x2769"></a> data.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE); + ncols = 0; +<a name="x2743"></a> line.<a href="qiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate); +} + +Grapher::~Grapher() +{ +} + +QPtrList<GraphModel::Datum>& <a name="f571"></a>Grapher::graphData() +{ + return data; +} + +GraphModel::ColType <a name="f572"></a>Grapher::colType(int col) const +{ + return coltype[col]; +} + +int <a name="f573"></a>Grapher::nCols() const +{ + return ncols; +} + + +<a name="x2751"></a>QNPWidget* Grapher::<a href="qnpinstance.html#newWindow">newWindow</a>() +{ + // Create a Graph - our subclass of QNPWidget. + Graph *graph = new Graph(*this); + + // Look at the arguments from the EMBED tag. + // GRAPHSTYLE chooses pie or bar + // FONTFAMILY and FONTSIZE choose the font + // + const char* style = <a href="qnpinstance.html#arg">arg</a>("GRAPHSTYLE"); + if ( style ) graph-><a href="qwidget.html#setStyle">setStyle</a>(style); + + const char* fontfamily = <a href="qnpinstance.html#arg">arg</a>("FONTFAMILY"); + const char* fontsize = <a href="qnpinstance.html#arg">arg</a>("FONTSIZE"); +<a name="x2775"></a> int ptsize = fontsize ? atoi(fontsize) : graph-><a href="qwidget.html#font">font</a>().pointSize(); + if (fontfamily) graph-><a href="qwidget.html#setFont">setFont</a>(QFont(fontfamily, ptsize)); + + <a href="qobject.html#connect">connect</a>(graph, SIGNAL(aboutPlugin()), this, SLOT(aboutPlugin())); + <a href="qobject.html#connect">connect</a>(graph, SIGNAL(aboutData()), this, SLOT(aboutData())); + + return graph; +} + +void <a name="f574"></a>Grapher::consumeLine() +{ +<a name="x2742"></a> line.<a href="qiodevice.html#close">close</a>(); + line.<a href="qiodevice.html#open">open</a>(IO_ReadOnly); + + <a href="qtextstream.html">QTextStream</a> ts( &line ); + + if (ncols == 0 ) { + ncols=0; + <a href="qptrlist.html">QPtrList</a><ColType> typelist; + typelist.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE); + do { + <a href="qstring.html">QString</a> typestr; + ts >> typestr >> ws; + ColType* t = 0; + if ( typestr == "num" ) { + t = new ColType(Numeric); + } else if ( typestr == "label" ) { + t = new ColType(Label); + } +<a name="x2770"></a> if (t) typelist.<a href="qptrlist.html#append">append</a>(t); +<a name="x2774"></a> } while (!ts.<a href="qtextstream.html#atEnd">atEnd</a>()); + coltype = new ColType[ncols]; + for (ColType* t = typelist.<a href="qptrlist.html#first">first</a>(); t; t = typelist.<a href="qptrlist.html#next">next</a>()) { + coltype[ncols++] = *t; + } + } else { + int col=0; + Datum *rowdata = new Datum[ncols]; + while ( col < ncols && !ts.<a href="qtextstream.html#atEnd">atEnd</a>() ) { + switch (coltype[col]) { + case Numeric: { + double value; + ts >> value >> ws; + rowdata[col].dbl = value; + break; + } + case Label: { + <a href="qstring.html">QString</a>* value = new <a href="qstring.html">QString</a>; + ts >> *value >> ws; + rowdata[col].str = value; + break; + } + } + col++; + } + + data.<a href="qptrlist.html#append">append</a>(rowdata); + } + + line.<a href="qiodevice.html#close">close</a>(); + line.<a href="qiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate); +} + +<a name="x2752"></a>int Grapher::<a href="qnpinstance.html#write">write</a>(QNPStream* /*str*/, int /*offset*/, int len, void* buffer) +{ + // The browser calls this function when data is available on one + // of the streams the plugin has requested. Since we are only + // processing one stream - the URL in the SRC argument of the EMBED + // tag, we assume the QNPStream is that one. Also, since we do not + // override QNPInstance::writeReady(), we must accepts ALL the data + // that is sent to this function. + // + char* txt = (char*)buffer; + for (int i=0; i<len; i++) { + char ch = txt[i]; + switch ( ch ) { + case '\n': + consumeLine(); + break; + case '\r': // ignore; + break; + default: +<a name="x2744"></a> line.<a href="qiodevice.html#putch">putch</a>(ch); + } + } + if ( <a href="qnpinstance.html#widget">widget</a>() ) + <a href="qnpinstance.html#widget">widget</a>()->update(); + + return len; +} + +void <a name="f575"></a>Grapher::aboutPlugin() +{ + <a href="qnpinstance.html#getURL">getURL</a>( "http://doc.trolltech.com/netscape-plugin.html", "_blank" ); +} + +void <a name="f576"></a>Grapher::aboutData() +{ + const char* page = <a href="qnpinstance.html#arg">arg</a>("DATAPAGE"); + if (page) + <a href="qnpinstance.html#getURL">getURL</a>( page, "_blank" ); + else +<a name="x2750"></a> QMessageBox::<a href="qmessagebox.html#message">message</a>("Help", "No help for this data"); +} + + +// +// GrapherPlugin is the start of everything. It is a QNPlugin subclass, +// and it is responsible for describing the plugin to the browser, and +// creating instances of the plugin when it appears in web page. +// + +class GrapherPlugin : public <a href="qnplugin.html">QNPlugin</a> { +public: + GrapherPlugin() + { + } + + <a href="qnpinstance.html">QNPInstance</a>* newInstance() + { + // Make a new Grapher, our subclass of QNPInstance. + return new Grapher; + } + + const char* getMIMEDescription() const + { + // Describe the MIME types which this plugin can + // process. Just the concocted "application/x-graphable" + // type, with the "g1n" filename extension. + // + return "application/x-graphable:g1n:Graphable ASCII numeric data"; + } + + const char * getPluginNameString() const + { + // The name of the plugin. This is the title string used in + // the "About Plugins" page of the browser. + // + return "Qt-based Graph Plugin"; + } + + const char * getPluginDescriptionString() const + { + // A longer description of the plugin. + // + return "A Qt-based LiveConnected plug-in that graphs numeric data"; + } + +}; + +// +// Finally, we provide the implementation of QNPlugin::create(), to +// provide our subclass of QNPlugin. +// + +QNPlugin* QNPlugin::create() +{ + return new GrapherPlugin; +} + +#include "grapher.moc" +</pre> + +<p>See also <a href="nsplugin-examples.html">Netscape Plugin Examples</a>. + +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |