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705 lines
24 KiB
705 lines
24 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/extensions/nsplugin/examples/grapher/grapher.doc:1 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Grapher Plugin</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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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>Grapher Plugin</h1>
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<p> This example graphs data from a simple text file. It
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demonstrates the use of the <a href="qnpinstance.html#writeReady">TQNPInstance::writeReady</a>()
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and <a href="qnpinstance.html#write">TQNPInstance::write</a>() functions.
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<p> To build the example, you must first build the
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<a href=nsplugin.html>TQt Netscape Plugin Extension</a> library.
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Then type <tt>make</tt> in <tt>extensions/nsplugin/examples/grapher/</tt>
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and copy the resulting <tt>grapher.so</tt> or <tt>npgrapher.dll</tt>
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to the Plugins directory of your WWW browser.
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<p> <EMBED ALIGN=LEFT WIDTH=49% HEIGHT=300 SRC=graph.g1n
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graphstyle=pie fontfamily=times fontsize=18>
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<p> The text file it accepts as input has a title line, then
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a sequence of lines with a number, then a string. The
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plugin displays a pie chart of the numbers, each segment
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labelled by the associated string. The user can select
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a bar chart view of the same data by selecting from the
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menu that appears when they point at the plugin.
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<p> The HTML tag used to embed the graph is:
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<small>
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<pre>
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<EMBED
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SRC=graph.g1n
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ALIGN=LEFT
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WIDTH=49% HEIGHT=300
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graphstyle=pie fontfamily=times
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fontsize=18>
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</pre><p> </small>
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Note that some HTML arguments (which we have capitalized here)
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are interpreted by the browser, while others are used by the
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plugin.
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<p> <br clear>
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With the simplicity and cross-platform nature of TQt-based plugins,
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pages like <a href="http://www.netcraft.com/survey/">Netcraft's
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Server Graphs</a> can be provided much more efficiently for both
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the service provider and consumer. Data need not be converted
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to an image at the server.
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<p> <br clear>
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<hr>
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Implementation:
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<p> <pre>// Include TQt Netscape Plugin classes.
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#include "ntqnp.h"
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// Include other TQt classes.
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#include <<a href="qpainter-h.html">ntqpainter.h</a>>
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#include <<a href="qtextstream-h.html">ntqtextstream.h</a>>
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#include <<a href="qbuffer-h.html">ntqbuffer.h</a>>
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#include <<a href="qpixmap-h.html">ntqpixmap.h</a>>
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#include <<a href="qmenubar-h.html">ntqmenubar.h</a>>
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#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
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#include <<a href="qptrlist-h.html">ntqptrlist.h</a>>
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#include <<a href="qmessagebox-h.html">ntqmessagebox.h</a>>
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// Include some C library functions.
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#include <math.h>
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#include <stdlib.h>
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#ifndef M_PI // Some math.h don't include this.
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#define M_PI 3.14159265358979323846264338327950288
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#endif
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//
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// GraphModel is a simple abstract class that describes
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// a table of numeric and text data.
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//
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class GraphModel {
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public:
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enum ColType { Numeric, Label };
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union Datum {
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double dbl;
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<a href="ntqstring.html">TQString</a>* str;
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};
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virtual TQPtrList<Datum>& graphData()=0;
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virtual ColType colType(int col) const=0;
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virtual int nCols() const=0;
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};
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//
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// Graph is a widget subclass that displays a GraphModel.
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// Since the widget is a TQNPWidget, it can be used as a plugin window,
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// returned by Grapher::newWindow() below.
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//
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class Graph : public <a href="qnpwidget.html">TQNPWidget</a> {
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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// Constructs a Graph to display a GraphModel
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//
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Graph(GraphModel&);
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~Graph();
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// Two styles are available - Pie and Bar graph
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//
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enum Style { Pie, Bar };
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static const char* styleName[];
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void setStyle(Style);
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void setStyle(const char*);
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// Timer event processing rotates the pie graph
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//
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void timerEvent(TQTimerEvent*);
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// These functions are provided by TQNPWidget - we override
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// them to hide and show the plugin menubar.
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//
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void enterInstance();
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void leaveInstance();
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// Paint the graph...
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//
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void paintEvent(TQPaintEvent*);
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//
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// ... as either a "Loading" message, a Bar graph, a Pie graph,
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// or an error message.
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//
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void paintWait(TQPaintEvent*);
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void paintBar(TQPaintEvent*);
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void paintPie(TQPaintEvent*);
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void paintError(const char*);
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signals:
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// Signals emitted when the Help menus are selected.
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void aboutPlugin();
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void aboutData();
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private:
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GraphModel& model;
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<a href="ntqmenubar.html">TQMenuBar</a> *menubar;
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Style style;
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<a href="ntqpopupmenu.html">TQPopupMenu</a>* stylemenu;
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int pieRotationTimer;
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int pieRotation;
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<a href="ntqpixmap.html">TQPixmap</a> pm;
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private slots:
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void setStyleFromMenu(int id);
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};
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<a name="f564"></a>Graph::Graph( GraphModel& mdl ) :
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model(mdl),
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<a href="ntqwidget.html#style">style</a>(Bar),
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pieRotationTimer(0),
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pieRotation(0)
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{
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// Create a menubar for the widget
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//
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menubar = new <a href="ntqmenubar.html">TQMenuBar</a>( this );
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stylemenu = new <a href="ntqpopupmenu.html">TQPopupMenu</a>;
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<a name="x2768"></a> stylemenu-><a href="ntqpopupmenu.html#setCheckable">setCheckable</a>(TRUE);
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for ( Style s = Pie; styleName[s]; s = Style(s+1)) {
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stylemenu-><a href="ntqmenudata.html#insertItem">insertItem</a>(styleName[s], s+100);
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}
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<a name="x2767"></a> <a href="ntqobject.html#connect">connect</a>(stylemenu, SIGNAL(<a href="ntqpopupmenu.html#activated">activated</a>(int)),
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this, SLOT(setStyleFromMenu(int)));
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<a href="ntqwidget.html#setStyle">setStyle</a>(Pie);
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>("Style", stylemenu);
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menubar-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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<a href="ntqpopupmenu.html">TQPopupMenu</a>* help = new <a href="ntqpopupmenu.html">TQPopupMenu</a>;
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help-><a href="ntqmenudata.html#insertItem">insertItem</a>( "About plugin...", this, SIGNAL(aboutPlugin()) );
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help-><a href="ntqmenudata.html#insertItem">insertItem</a>( "About data...", this, SIGNAL(aboutData()) );
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>("Help", help);
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<a name="x2745"></a> menubar-><a href="ntqmenubar.html#hide">hide</a>();
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}
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Graph::~Graph()
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{
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}
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<a name="x2778"></a>void Graph::<a href="ntqwidget.html#setStyle">setStyle</a>(Style s)
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{
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if (style != s) {
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if (pieRotationTimer)
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<a href="ntqobject.html#killTimer">killTimer</a>(pieRotationTimer);
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<a name="x2749"></a> stylemenu-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>(100+style, FALSE);
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style = s;
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if ( style == Pie )
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pieRotationTimer = <a href="ntqobject.html#startTimer">startTimer</a>( 80 );
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else
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pieRotationTimer = 0;
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stylemenu-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>(100+style, TRUE);
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<a href="ntqwidget.html#update">update</a>();
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}
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}
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<a name="x2755"></a>void Graph::<a href="ntqobject.html#timerEvent">timerEvent</a>(TQTimerEvent*)
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{
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pieRotation = ( pieRotation + 6 ) % 360; repaint(FALSE);
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}
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void Graph::<a href="ntqwidget.html#setStyle">setStyle</a>(const char* stext)
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{
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for ( Style s = Pie; styleName[s]; s = Style(s+1) ) {
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if ( <a href="ntqcstring.html#qstricmp">qstricmp</a>(stext,styleName[s])==0 ) {
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<a href="ntqwidget.html#setStyle">setStyle</a>(s);
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return;
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}
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}
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}
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<a name="x2753"></a>void Graph::<a href="qnpwidget.html#enterInstance">enterInstance</a>()
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{
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<a name="x2746"></a> menubar-><a href="ntqmenubar.html#show">show</a>();
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}
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<a name="x2754"></a>void Graph::<a href="qnpwidget.html#leaveInstance">leaveInstance</a>()
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{
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menubar-><a href="ntqmenubar.html#hide">hide</a>();
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}
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void <a name="f565"></a>Graph::paintError(const char* e)
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{
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<a href="ntqpainter.html">TQPainter</a> p(this);
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int w = <a href="ntqwidget.html#width">width</a>();
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<a name="x2760"></a> p.<a href="ntqpainter.html#drawText">drawText</a>(w/8, 0, w-w/4, height(), AlignCenter|WordBreak, e);
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}
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void <a name="f566"></a>Graph::paintBar(TQPaintEvent* event)
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{
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if ( model.colType(0) != GraphModel::Numeric ) {
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paintError("First column not numeric, cannot draw bar graph\n");
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return;
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}
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<a href="ntqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData();
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double max = 0.0;
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<a name="x2772"></a> for (GraphModel::Datum* rowdata = data.<a href="ntqptrlist.html#first">first</a>();
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<a name="x2773"></a> rowdata; rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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if (rowdata[0].dbl > max) max = rowdata[0].dbl;
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}
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const uint w = <a href="ntqwidget.html#width">width</a>();
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const uint h = <a href="ntqwidget.html#height">height</a>();
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<a href="ntqpainter.html">TQPainter</a> p(this);
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<a name="x2762"></a> p.<a href="ntqpainter.html#setClipRect">setClipRect</a>(event->rect());
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<a name="x2771"></a> if ( w > data.<a href="ntqptrlist.html#count">count</a>() ) {
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// More pixels than data
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int x = 0;
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int i = 0;
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<a href="ntqfontmetrics.html">TQFontMetrics</a> fm=<a href="ntqwidget.html#fontMetrics">fontMetrics</a>();
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<a name="x2741"></a> int fh = fm.<a href="ntqfontmetrics.html#height">height</a>();
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for (GraphModel::Datum* rowdata = data.<a href="ntqptrlist.html#first">first</a>();
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rowdata; rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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<a href="ntqcolor.html">TQColor</a> c;
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<a name="x2740"></a> c.<a href="ntqcolor.html#setHsv">setHsv</a>( (i * 255)/data.<a href="ntqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect
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p.<a href="ntqpainter.html#setBrush">setBrush</a>(c);
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int bw = (w-w/4-x)/(data.<a href="ntqptrlist.html#count">count</a>()-i);
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int bh = int((h-h/4-1)*rowdata[0].dbl/max);
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p.<a href="ntqpainter.html#drawRect">drawRect</a>( w/8+x, h-h/8-1-bh, bw, bh );
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i++;
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x+=bw;
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}
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} else {
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// More data than pixels
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int x = 0;
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int i = 0;
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double av = 0.0;
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int n = 0;
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for (GraphModel::Datum* rowdata = data.<a href="ntqptrlist.html#first">first</a>(); rowdata;
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rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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int bx = i*w/data.<a href="ntqptrlist.html#count">count</a>();
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if (bx > x) {
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<a href="ntqcolor.html">TQColor</a> c;
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c.<a href="ntqcolor.html#setHsv">setHsv</a>( (x * 255)/w, 255, 255 );// rainbow effect
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p.<a href="ntqpainter.html#setPen">setPen</a>(c);
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int bh = int(h*av/n/max);
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p.<a href="ntqpainter.html#drawLine">drawLine</a>(x,h-1,x,h-bh);
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av = 0.0;
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n = 0;
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x = bx;
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}
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av += rowdata[0].dbl;
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n++;
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i++;
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}
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}
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}
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void <a name="f567"></a>Graph::paintPie(TQPaintEvent* event)
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{
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if ( model.colType(0) != GraphModel::Numeric ) {
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paintError("First column not numeric, cannot draw pie graph\n");
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return;
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}
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<a href="ntqptrlist.html">TQPtrList</a><GraphModel::Datum>& data = model.graphData();
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double total = 0.0;
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GraphModel::Datum* rowdata;
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for (rowdata = data.<a href="ntqptrlist.html#first">first</a>();
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rowdata; rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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total += rowdata[0].dbl;
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}
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// Only use first column for pie chart
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if ( !total ) return;
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int apos = (pieRotation-90)*16;
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const int w = <a href="ntqwidget.html#width">width</a>();
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const int h = <a href="ntqwidget.html#height">height</a>();
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const int xd = w - w/5;
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const int yd = h - h/5;
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<a name="x2766"></a> pm.<a href="ntqpixmap.html#resize">resize</a>(<a href="ntqwidget.html#width">width</a>(),height());
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<a name="x2765"></a> pm.<a href="ntqpixmap.html#fill">fill</a>(<a href="ntqwidget.html#backgroundColor">backgroundColor</a>());
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<a href="ntqpainter.html">TQPainter</a> p(&pm);
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<a name="x2763"></a> p.<a href="ntqpainter.html#setFont">setFont</a>(<a href="ntqwidget.html#font">font</a>());
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p.<a href="ntqpainter.html#setClipRect">setClipRect</a>(event->rect());
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int i = 0;
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for (rowdata = data.<a href="ntqptrlist.html#first">first</a>();
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rowdata; rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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<a href="ntqcolor.html">TQColor</a> c;
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c.<a href="ntqcolor.html#setHsv">setHsv</a>( ( i * 255)/data.<a href="ntqptrlist.html#count">count</a>(), 255, 255 );// rainbow effect
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p.<a href="ntqpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c
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int a = int(( rowdata[0].dbl * 360.0 ) / total * 16.0 + 0.5);
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<a name="x2757"></a> p.<a href="ntqpainter.html#drawPie">drawPie</a>( w/10, h/10, xd, yd, -apos, -a );
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apos += a;
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i++;
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}
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if (model.colType(1) == GraphModel::Label) {
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double apos = (pieRotation-90)*M_PI/180;
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for (rowdata = data.<a href="ntqptrlist.html#first">first</a>();
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rowdata; rowdata = data.<a href="ntqptrlist.html#next">next</a>())
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{
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double a = rowdata[0].dbl * 360 / total * M_PI / 180;
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int x = int(cos(apos+a/2)*w*5/16 + w/2 + 0.5);
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int y = int(sin(apos+a/2)*h*5/16 + h/2 + 0.5);
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// ### This causes a crash, so comment out for now
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/*p.<a href="ntqpainter.html#drawText">drawText</a>(x-w/8, y-h/8, w/4, h/4,
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WordBreak|AlignCenter,
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*rowdata[1].str);*/
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apos += a;
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}
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}
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<a href="ntqpainter.html">TQPainter</a> p2(this);
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p2.<a href="ntqpainter.html#setClipRect">setClipRect</a>(event->rect());
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<a name="x2758"></a> p2.<a href="ntqpainter.html#drawPixmap">drawPixmap</a>(0,0,pm);
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}
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void <a name="f568"></a>Graph::paintWait(TQPaintEvent*)
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{
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<a href="ntqpainter.html">TQPainter</a> p(this);
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p.<a href="ntqpainter.html#drawText">drawText</a>(rect(), AlignCenter, "Loading...");
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}
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void Graph::<a href="ntqwidget.html#paintEvent">paintEvent</a>(TQPaintEvent* event)
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{
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if (!model.nCols()) {
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paintWait(event);
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} else {
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|
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="qnpinstance.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="qnpwidget.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="ntqptrlist.html">TQPtrList</a><Datum>& graphData();
|
|
ColType colType(int col) const;
|
|
int nCols() const;
|
|
|
|
void consumeLine();
|
|
<a href="ntqptrlist.html">TQPtrList</a><Datum> data;
|
|
<a href="ntqbuffer.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="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE);
|
|
ncols = 0;
|
|
<a name="x2743"></a> line.<a href="ntqiodevice.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="qnpinstance.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="qnpinstance.html#arg">arg</a>("GRAPHSTYLE");
|
|
if ( style ) graph-><a href="ntqwidget.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="ntqwidget.html#font">font</a>().pointSize();
|
|
if (fontfamily) graph-><a href="ntqwidget.html#setFont">setFont</a>(TQFont(fontfamily, ptsize));
|
|
|
|
<a href="ntqobject.html#connect">connect</a>(graph, SIGNAL(aboutPlugin()), this, SLOT(aboutPlugin()));
|
|
<a href="ntqobject.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="ntqiodevice.html#close">close</a>();
|
|
line.<a href="ntqiodevice.html#open">open</a>(IO_ReadOnly);
|
|
|
|
<a href="ntqtextstream.html">TQTextStream</a> ts( &line );
|
|
|
|
if (ncols == 0 ) {
|
|
ncols=0;
|
|
<a href="ntqptrlist.html">TQPtrList</a><ColType> typelist;
|
|
typelist.<a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>(TRUE);
|
|
do {
|
|
<a href="ntqstring.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="ntqptrlist.html#append">append</a>(t);
|
|
<a name="x2774"></a> } while (!ts.<a href="ntqtextstream.html#atEnd">atEnd</a>());
|
|
coltype = new ColType[ncols];
|
|
for (ColType* t = typelist.<a href="ntqptrlist.html#first">first</a>(); t; t = typelist.<a href="ntqptrlist.html#next">next</a>()) {
|
|
coltype[ncols++] = *t;
|
|
}
|
|
} else {
|
|
int col=0;
|
|
Datum *rowdata = new Datum[ncols];
|
|
while ( col < ncols && !ts.<a href="ntqtextstream.html#atEnd">atEnd</a>() ) {
|
|
switch (coltype[col]) {
|
|
case Numeric: {
|
|
double value;
|
|
ts >> value >> ws;
|
|
rowdata[col].dbl = value;
|
|
break;
|
|
}
|
|
case Label: {
|
|
<a href="ntqstring.html">TQString</a>* value = new <a href="ntqstring.html">TQString</a>;
|
|
ts >> *value >> ws;
|
|
rowdata[col].str = value;
|
|
break;
|
|
}
|
|
}
|
|
col++;
|
|
}
|
|
|
|
data.<a href="ntqptrlist.html#append">append</a>(rowdata);
|
|
}
|
|
|
|
line.<a href="ntqiodevice.html#close">close</a>();
|
|
line.<a href="ntqiodevice.html#open">open</a>(IO_WriteOnly|IO_Truncate);
|
|
}
|
|
|
|
<a name="x2752"></a>int Grapher::<a href="qnpinstance.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="ntqiodevice.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> TQMessageBox::<a href="ntqmessagebox.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="qnplugin.html">TQNPlugin</a> {
|
|
public:
|
|
GrapherPlugin()
|
|
{
|
|
}
|
|
|
|
<a href="qnpinstance.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>
|