diff options
Diffstat (limited to 'doc/html/grapher-nsplugin-example.html')
| -rw-r--r-- | doc/html/grapher-nsplugin-example.html | 704 |
1 files changed, 0 insertions, 704 deletions
diff --git a/doc/html/grapher-nsplugin-example.html b/doc/html/grapher-nsplugin-example.html deleted file mode 100644 index bd138c659..000000000 --- a/doc/html/grapher-nsplugin-example.html +++ /dev/null @@ -1,704 +0,0 @@ -<!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="tqnpinstance.html#writeReady">TQNPInstance::writeReady</a>() -and <a href="tqnpinstance.html#write">TQNPInstance::write</a>() functions. -<p> To build the example, you must first build the -<a href=nsplugin.html>TQt 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 TQt-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 TQt Netscape Plugin classes. -#include "tqnp.h" - -// Include other TQt classes. -#include <<a href="tqpainter-h.html">tqpainter.h</a>> -#include <<a href="tqtextstream-h.html">tqtextstream.h</a>> -#include <<a href="tqbuffer-h.html">tqbuffer.h</a>> -#include <<a href="tqpixmap-h.html">tqpixmap.h</a>> -#include <<a href="tqmenubar-h.html">tqmenubar.h</a>> -#include <<a href="tqpushbutton-h.html">tqpushbutton.h</a>> -#include <<a href="tqptrlist-h.html">tqptrlist.h</a>> -#include <<a href="tqmessagebox-h.html">tqmessagebox.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="tqstring.html">TQString</a>* str; - }; - - virtual TQPtrList<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 TQNPWidget, it can be used as a plugin window, -// returned by Grapher::newWindow() below. -// - -class Graph : public <a href="tqnpwidget.html">TQNPWidget</a> { - <a href="metaobjects.html#TQ_OBJECT">TQ_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(TQTimerEvent*); - - // These functions are provided by TQNPWidget - we override - // them to hide and show the plugin menubar. - // - void enterInstance(); - void leaveInstance(); - - // Paint the graph... - // - void paintEvent(TQPaintEvent*); - // - // ... as either a "Loading" message, a Bar graph, a Pie graph, - // or an error message. - // - void paintWait(TQPaintEvent*); - void paintBar(TQPaintEvent*); - void paintPie(TQPaintEvent*); - void paintError(const char*); - -signals: - // Signals emitted when the Help menus are selected. - void aboutPlugin(); - void aboutData(); - -private: - GraphModel& model; - <a href="tqmenubar.html">TQMenuBar</a> *menubar; - Style style; - <a href="tqpopupmenu.html">TQPopupMenu</a>* stylemenu; - int pieRotationTimer; - int pieRotation; - <a href="tqpixmap.html">TQPixmap</a> pm; - -private slots: - void setStyleFromMenu(int id); -}; - - -<a name="f564"></a>Graph::Graph( GraphModel& mdl ) : - model(mdl), - <a href="tqwidget.html#style">style</a>(Bar), - pieRotationTimer(0), - pieRotation(0) -{ - // Create a menubar for the widget - // - menubar = new <a href="tqmenubar.html">TQMenuBar</a>( this ); - stylemenu = new <a href="tqpopupmenu.html">TQPopupMenu</a>; -<a name="x2768"></a> stylemenu-><a href="tqpopupmenu.html#setCheckable">setCheckable</a>(TRUE); - for ( Style s = Pie; styleName[s]; s = Style(s+1)) { - stylemenu-><a href="tqmenudata.html#insertItem">insertItem</a>(styleName[s], s+100); - } -<a name="x2767"></a> <a href="tqobject.html#connect">connect</a>(stylemenu, TQ_SIGNAL(<a href="tqpopupmenu.html#activated">activated</a>(int)), - this, TQ_SLOT(setStyleFromMenu(int))); - <a href="tqwidget.html#setStyle">setStyle</a>(Pie); - - menubar-><a href="tqmenudata.html#insertItem">insertItem</a>("Style", stylemenu); - menubar-><a href="tqmenudata.html#insertSeparator">insertSeparator</a>(); - - <a href="tqpopupmenu.html">TQPopupMenu</a>* help = new <a href="tqpopupmenu.html">TQPopupMenu</a>; - help-><a href="tqmenudata.html#insertItem">insertItem</a>( "About plugin...", this, TQ_SIGNAL(aboutPlugin()) ); - help-><a href="tqmenudata.html#insertItem">insertItem</a>( "About data...", this, TQ_SIGNAL(aboutData()) ); - menubar-><a href="tqmenudata.html#insertItem">insertItem</a>("Help", help); -<a name="x2745"></a> menubar-><a href="tqmenubar.html#hide">hide</a>(); -} - -Graph::~Graph() -{ -} - -<a name="x2778"></a>void Graph::<a href="tqwidget.html#setStyle">setStyle</a>(Style s) -{ - if (style != s) { - if (pieRotationTimer) - <a href="tqobject.html#killTimer">killTimer</a>(pieRotationTimer); -<a name="x2749"></a> stylemenu-><a href="tqmenudata.html#setItemChecked">setItemChecked</a>(100+style, FALSE); - style = s; - if ( style == Pie ) - pieRotationTimer = <a href="tqobject.html#startTimer">startTimer</a>( 80 ); - else - pieRotationTimer = 0; - stylemenu-><a href="tqmenudata.html#setItemChecked">setItemChecked</a>(100+style, TRUE); - <a href="tqwidget.html#update">update</a>(); - } -} - -<a name="x2755"></a>void Graph::<a href="tqobject.html#timerEvent">timerEvent</a>(TQTimerEvent*) -{ - pieRotation = ( pieRotation + 6 ) % 360; repaint(FALSE); -} - -void Graph::<a href="tqwidget.html#setStyle">setStyle</a>(const char* stext) -{ - for ( Style s = Pie; styleName[s]; s = Style(s+1) ) { - if ( <a href="tqcstring.html#qstricmp">tqstricmp</a>(stext,styleName[s])==0 ) { - <a href="tqwidget.html#setStyle">setStyle</a>(s); - return; - } - } -} - -<a name="x2753"></a>void Graph::<a href="tqnpwidget.html#enterInstance">enterInstance</a>() -{ -<a name="x2746"></a> menubar-><a href="tqmenubar.html#show">show</a>(); -} - -<a name="x2754"></a>void Graph::<a href="tqnpwidget.html#leaveInstance">leaveInstance</a>() -{ - menubar-><a href="tqmenubar.html#hide">hide</a>(); -} - -void <a name="f565"></a>Graph::paintError(const char* e) -{ - <a href="tqpainter.html">TQPainter</a> p(this); - int w = <a href="tqwidget.html#width">width</a>(); -<a name="x2760"></a> p.<a href="tqpainter.html#drawText">drawText</a>(w/8, 0, w-w/4, height(), AlignCenter|WordBreak, e); -} - -void <a name="f566"></a>Graph::paintBar(TQPaintEvent* event) -{ - if ( model.colType(0) != GraphModel::Numeric ) { - paintError("First column not numeric, cannot draw bar graph\n"); - return; - } - - <a href="tqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData(); - - double max = 0.0; - -<a name="x2772"></a> for (GraphModel::Datum* rowdata = data.<a href="tqptrlist.html#first">first</a>(); -<a name="x2773"></a> rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>()) - { - if (rowdata[0].dbl > max) max = rowdata[0].dbl; - } - - const uint w = <a href="tqwidget.html#width">width</a>(); - const uint h = <a href="tqwidget.html#height">height</a>(); - - <a href="tqpainter.html">TQPainter</a> p(this); - -<a name="x2762"></a> p.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect()); - -<a name="x2771"></a> if ( w > data.<a href="tqptrlist.html#count">count</a>() ) { - // More pixels than data - int x = 0; - int i = 0; - <a href="tqfontmetrics.html">TQFontMetrics</a> fm=<a href="tqwidget.html#fontMetrics">fontMetrics</a>(); -<a name="x2741"></a> int fh = fm.<a href="tqfontmetrics.html#height">height</a>(); - - for (GraphModel::Datum* rowdata = data.<a href="tqptrlist.html#first">first</a>(); - rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>()) - { - <a href="tqcolor.html">TQColor</a> c; -<a name="x2740"></a> c.<a href="tqcolor.html#setHsv">setHsv</a>( (i * 255)/data.<a href="tqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect - p.<a href="tqpainter.html#setBrush">setBrush</a>(c); - int bw = (w-w/4-x)/(data.<a href="tqptrlist.html#count">count</a>()-i); - int bh = int((h-h/4-1)*rowdata[0].dbl/max); - p.<a href="tqpainter.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="tqptrlist.html#first">first</a>(); rowdata; - rowdata = data.<a href="tqptrlist.html#next">next</a>()) - { - int bx = i*w/data.<a href="tqptrlist.html#count">count</a>(); - - if (bx > x) { - <a href="tqcolor.html">TQColor</a> c; - c.<a href="tqcolor.html#setHsv">setHsv</a>( (x * 255)/w, 255, 255 );// rainbow effect - p.<a href="tqpainter.html#setPen">setPen</a>(c); - int bh = int(h*av/n/max); - - p.<a href="tqpainter.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(TQPaintEvent* event) -{ - if ( model.colType(0) != GraphModel::Numeric ) { - paintError("First column not numeric, cannot draw pie graph\n"); - return; - } - - <a href="tqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData(); - - double total = 0.0; - - GraphModel::Datum* rowdata; - - for (rowdata = data.<a href="tqptrlist.html#first">first</a>(); - rowdata; rowdata = data.<a href="tqptrlist.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="tqwidget.html#width">width</a>(); - const int h = <a href="tqwidget.html#height">height</a>(); - - const int xd = w - w/5; - const int yd = h - h/5; - -<a name="x2766"></a> pm.<a href="tqpixmap.html#resize">resize</a>(<a href="tqwidget.html#width">width</a>(),height()); -<a name="x2765"></a> pm.<a href="tqpixmap.html#fill">fill</a>(<a href="tqwidget.html#backgroundColor">backgroundColor</a>()); - <a href="tqpainter.html">TQPainter</a> p(&pm); -<a name="x2763"></a> p.<a href="tqpainter.html#setFont">setFont</a>(<a href="tqwidget.html#font">font</a>()); - - p.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect()); - - int i = 0; - - for (rowdata = data.<a href="tqptrlist.html#first">first</a>(); - rowdata; rowdata = data.<a href="tqptrlist.html#next">next</a>()) - { - <a href="tqcolor.html">TQColor</a> c; - - c.<a href="tqcolor.html#setHsv">setHsv</a>( ( i * 255)/data.<a href="tqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect - p.<a href="tqpainter.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="tqpainter.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="tqptrlist.html#first">first</a>(); - rowdata; rowdata = data.<a href="tqptrlist.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="tqpainter.html#drawText">drawText</a>(x-w/8, y-h/8, w/4, h/4, - WordBreak|AlignCenter, - *rowdata[1].str);*/ - apos += a; - } - } - - <a href="tqpainter.html">TQPainter</a> p2(this); - p2.<a href="tqpainter.html#setClipRect">setClipRect</a>(event->rect()); -<a name="x2758"></a> p2.<a href="tqpainter.html#drawPixmap">drawPixmap</a>(0,0,pm); -} - -void <a name="f568"></a>Graph::paintWait(TQPaintEvent*) -{ - <a href="tqpainter.html">TQPainter</a> p(this); - p.<a href="tqpainter.html#drawText">drawText</a>(rect(), AlignCenter, "Loading..."); -} - -void Graph::<a href="tqwidget.html#paintEvent">paintEvent</a>(TQPaintEvent* 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 TQNPInstance, and so it can be returned -// by GrapherPlugin::newInstance(). A TQNPInstance 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="tqnpinstance.html">TQNPInstance</a>, GraphModel { - TQ_OBJECT -public: - // Create a Grapher - all Grapher plugins are created - // by one GrapherPlugin object. - // - Grapher(); - ~Grapher(); - - // We override this TQNPInstance function to create our - // own subclass of TQNPWidget, a Graph widget. - // - <a href="tqnpwidget.html">TQNPWidget</a>* newWindow(); - - // We override this TQNPInstance function to process the - // incoming graph data. - // - int write(TQNPStream* /*str*/, int /*offset*/, int len, void* buffer); - -private: - // Grapher is a GraphModel, so it implements the pure virtual - // functions of that class. - // - <a href="tqptrlist.html">TQPtrList</a><Datum>& graphData(); - ColType colType(int col) const; - int nCols() const; - - void consumeLine(); - <a href="tqptrlist.html">TQPtrList</a><Datum> data; - <a href="tqbuffer.html">TQBuffer</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="tqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE); - ncols = 0; -<a name="x2743"></a> line.<a href="tqiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate); -} - -Grapher::~Grapher() -{ -} - -TQPtrList<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>TQNPWidget* Grapher::<a href="tqnpinstance.html#newWindow">newWindow</a>() -{ - // Create a Graph - our subclass of TQNPWidget. - 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="tqnpinstance.html#arg">arg</a>("GRAPHSTYLE"); - if ( style ) graph-><a href="tqwidget.html#setStyle">setStyle</a>(style); - - const char* fontfamily = <a href="tqnpinstance.html#arg">arg</a>("FONTFAMILY"); - const char* fontsize = <a href="tqnpinstance.html#arg">arg</a>("FONTSIZE"); -<a name="x2775"></a> int ptsize = fontsize ? atoi(fontsize) : graph-><a href="tqwidget.html#font">font</a>().pointSize(); - if (fontfamily) graph-><a href="tqwidget.html#setFont">setFont</a>(TQFont(fontfamily, ptsize)); - - <a href="tqobject.html#connect">connect</a>(graph, TQ_SIGNAL(aboutPlugin()), this, TQ_SLOT(aboutPlugin())); - <a href="tqobject.html#connect">connect</a>(graph, TQ_SIGNAL(aboutData()), this, TQ_SLOT(aboutData())); - - return graph; -} - -void <a name="f574"></a>Grapher::consumeLine() -{ -<a name="x2742"></a> line.<a href="tqiodevice.html#close">close</a>(); - line.<a href="tqiodevice.html#open">open</a>(IO_ReadOnly); - - <a href="tqtextstream.html">TQTextStream</a> ts( &line ); - - if (ncols == 0 ) { - ncols=0; - <a href="tqptrlist.html">TQPtrList</a><ColType> typelist; - typelist.<a href="tqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE); - do { - <a href="tqstring.html">TQString</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="tqptrlist.html#append">append</a>(t); -<a name="x2774"></a> } while (!ts.<a href="tqtextstream.html#atEnd">atEnd</a>()); - coltype = new ColType[ncols]; - for (ColType* t = typelist.<a href="tqptrlist.html#first">first</a>(); t; t = typelist.<a href="tqptrlist.html#next">next</a>()) { - coltype[ncols++] = *t; - } - } else { - int col=0; - Datum *rowdata = new Datum[ncols]; - while ( col < ncols && !ts.<a href="tqtextstream.html#atEnd">atEnd</a>() ) { - switch (coltype[col]) { - case Numeric: { - double value; - ts >> value >> ws; - rowdata[col].dbl = value; - break; - } - case Label: { - <a href="tqstring.html">TQString</a>* value = new <a href="tqstring.html">TQString</a>; - ts >> *value >> ws; - rowdata[col].str = value; - break; - } - } - col++; - } - - data.<a href="tqptrlist.html#append">append</a>(rowdata); - } - - line.<a href="tqiodevice.html#close">close</a>(); - line.<a href="tqiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate); -} - -<a name="x2752"></a>int Grapher::<a href="tqnpinstance.html#write">write</a>(TQNPStream* /*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 TQNPStream is that one. Also, since we do not - // override TQNPInstance::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="tqiodevice.html#putch">putch</a>(ch); - } - } - if ( <a href="tqnpinstance.html#widget">widget</a>() ) - <a href="tqnpinstance.html#widget">widget</a>()->update(); - - return len; -} - -void <a name="f575"></a>Grapher::aboutPlugin() -{ - <a href="tqnpinstance.html#getURL">getURL</a>( "http://doc.trolltech.com/netscape-plugin.html", "_blank" ); -} - -void <a name="f576"></a>Grapher::aboutData() -{ - const char* page = <a href="tqnpinstance.html#arg">arg</a>("DATAPAGE"); - if (page) - <a href="tqnpinstance.html#getURL">getURL</a>( page, "_blank" ); - else -<a name="x2750"></a> TQMessageBox::<a href="tqmessagebox.html#message">message</a>("Help", "No help for this data"); -} - - -// -// GrapherPlugin is the start of everything. It is a TQNPlugin 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="tqnplugin.html">TQNPlugin</a> { -public: - GrapherPlugin() - { - } - - <a href="tqnpinstance.html">TQNPInstance</a>* newInstance() - { - // Make a new Grapher, our subclass of TQNPInstance. - 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 "TQt-based Graph Plugin"; - } - - const char * getPluginDescriptionString() const - { - // A longer description of the plugin. - // - return "A TQt-based LiveConnected plug-in that graphs numeric data"; - } - -}; - -// -// Finally, we provide the implementation of TQNPlugin::create(), to -// provide our subclass of TQNPlugin. -// - -TQNPlugin* TQNPlugin::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>TQt 3.3.8</div> -</table></div></address></body> -</html> |