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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Link e testo scorrevole</title>
<link type="text/css" rel="stylesheet" href="../fpdf.css">
</head>
<body>
<h1>Link e testo scorrevole</h1>
Questo tutorial spiega come inserire link (interni ed esterni) e mostrare una nuova modalità di
scrittura. Contiene anche un parser HTML minimale.
<div class="source">
<pre><code>&lt;?php
<span class="kw">require(</span><span class="str">'fpdf.php'</span><span class="kw">);
class </span>PDF <span class="kw">extends </span>FPDF
<span class="kw">{
protected </span>$B <span class="kw">= </span>0<span class="kw">;
protected </span>$I <span class="kw">= </span>0<span class="kw">;
protected </span>$U <span class="kw">= </span>0<span class="kw">;
protected </span>$HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
function </span>WriteHTML<span class="kw">(</span>$html<span class="kw">)
{
</span><span class="cmt">// HTML parser
</span>$html <span class="kw">= </span>str_replace<span class="kw">(</span><span class="str">"\n"</span><span class="kw">,</span><span class="str">' '</span><span class="kw">,</span>$html<span class="kw">);
</span>$a <span class="kw">= </span>preg_split<span class="kw">(</span><span class="str">'/&lt;(.*)&gt;/U'</span><span class="kw">,</span>$html<span class="kw">,-</span>1<span class="kw">,</span>PREG_SPLIT_DELIM_CAPTURE<span class="kw">);
foreach(</span>$a <span class="kw">as </span>$i<span class="kw">=&gt;</span>$e<span class="kw">)
{
if(</span>$i<span class="kw">%</span>2<span class="kw">==</span>0<span class="kw">)
{
</span><span class="cmt">// Text
</span><span class="kw">if(</span>$<span class="kw">this-&gt;</span>HREF<span class="kw">)
</span>$<span class="kw">this-&gt;</span>PutLink<span class="kw">(</span>$<span class="kw">this-&gt;</span>HREF<span class="kw">,</span>$e<span class="kw">);
else
</span>$<span class="kw">this-&gt;</span>Write<span class="kw">(</span>5<span class="kw">,</span>$e<span class="kw">);
}
else
{
</span><span class="cmt">// Tag
</span><span class="kw">if(</span>$e<span class="kw">[</span>0<span class="kw">]==</span><span class="str">'/'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>CloseTag<span class="kw">(</span>strtoupper<span class="kw">(</span>substr<span class="kw">(</span>$e<span class="kw">,</span>1<span class="kw">)));
else
{
</span><span class="cmt">// Extract attributes
</span>$a2 <span class="kw">= </span>explode<span class="kw">(</span><span class="str">' '</span><span class="kw">,</span>$e<span class="kw">);
</span>$tag <span class="kw">= </span>strtoupper<span class="kw">(</span>array_shift<span class="kw">(</span>$a2<span class="kw">));
</span>$attr <span class="kw">= array();
foreach(</span>$a2 <span class="kw">as </span>$v<span class="kw">)
{
if(</span>preg_match<span class="kw">(</span><span class="str">'/([^=]*)=["\']?([^"\']*)/'</span><span class="kw">,</span>$v<span class="kw">,</span>$a3<span class="kw">))
</span>$attr<span class="kw">[</span>strtoupper<span class="kw">(</span>$a3<span class="kw">[</span>1<span class="kw">])] = </span>$a3<span class="kw">[</span>2<span class="kw">];
}
</span>$<span class="kw">this-&gt;</span>OpenTag<span class="kw">(</span>$tag<span class="kw">,</span>$attr<span class="kw">);
}
}
}
}
function </span>OpenTag<span class="kw">(</span>$tag<span class="kw">, </span>$attr<span class="kw">)
{
</span><span class="cmt">// Opening tag
</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>true<span class="kw">);
if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>HREF <span class="kw">= </span>$attr<span class="kw">[</span><span class="str">'HREF'</span><span class="kw">];
if(</span>$tag<span class="kw">==</span><span class="str">'BR'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>Ln<span class="kw">(</span>5<span class="kw">);
}
function </span>CloseTag<span class="kw">(</span>$tag<span class="kw">)
{
</span><span class="cmt">// Closing tag
</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>false<span class="kw">);
if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
</span>$<span class="kw">this-&gt;</span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
}
function </span>SetStyle<span class="kw">(</span>$tag<span class="kw">, </span>$enable<span class="kw">)
{
</span><span class="cmt">// Modify style and select corresponding font
</span>$<span class="kw">this-&gt;</span>$tag <span class="kw">+= (</span>$enable <span class="kw">? </span>1 <span class="kw">: -</span>1<span class="kw">);
</span>$style <span class="kw">= </span><span class="str">''</span><span class="kw">;
foreach(array(</span><span class="str">'B'</span><span class="kw">, </span><span class="str">'I'</span><span class="kw">, </span><span class="str">'U'</span><span class="kw">) as </span>$s<span class="kw">)
{
if(</span>$<span class="kw">this-&gt;</span>$s<span class="kw">&gt;</span>0<span class="kw">)
</span>$style <span class="kw">.= </span>$s<span class="kw">;
}
</span>$<span class="kw">this-&gt;</span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span>$style<span class="kw">);
}
function </span>PutLink<span class="kw">(</span>$URL<span class="kw">, </span>$txt<span class="kw">)
{
</span><span class="cmt">// Put a hyperlink
</span>$<span class="kw">this-&gt;</span>SetTextColor<span class="kw">(</span>0<span class="kw">,</span>0<span class="kw">,</span>255<span class="kw">);
</span>$<span class="kw">this-&gt;</span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>true<span class="kw">);
</span>$<span class="kw">this-&gt;</span>Write<span class="kw">(</span>5<span class="kw">,</span>$txt<span class="kw">,</span>$URL<span class="kw">);
</span>$<span class="kw">this-&gt;</span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>false<span class="kw">);
</span>$<span class="kw">this-&gt;</span>SetTextColor<span class="kw">(</span>0<span class="kw">);
}
}
</span>$html <span class="kw">= </span><span class="str">'You can now easily print text mixing different styles: &lt;b&gt;bold&lt;/b&gt;, &lt;i&gt;italic&lt;/i&gt;,
&lt;u&gt;underlined&lt;/u&gt;, or &lt;b&gt;&lt;i&gt;&lt;u&gt;all at once&lt;/u&gt;&lt;/i&gt;&lt;/b&gt;!&lt;br&gt;&lt;br&gt;You can also insert links on
text, such as &lt;a href="http://www.fpdf.org"&gt;www.fpdf.org&lt;/a&gt;, or on an image: click on the logo.'</span><span class="kw">;
</span>$pdf <span class="kw">= new </span>PDF<span class="kw">();
</span><span class="cmt">// First page
</span>$pdf<span class="kw">-&gt;</span>AddPage<span class="kw">();
</span>$pdf<span class="kw">-&gt;</span>SetFont<span class="kw">(</span><span class="str">'Arial'</span><span class="kw">,</span><span class="str">''</span><span class="kw">,</span>20<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">"To find out what's new in this tutorial, click "</span><span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span><span class="str">'U'</span><span class="kw">);
</span>$link <span class="kw">= </span>$pdf<span class="kw">-&gt;</span>AddLink<span class="kw">();
</span>$pdf<span class="kw">-&gt;</span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">'here'</span><span class="kw">,</span>$link<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">);
</span><span class="cmt">// Second page
</span>$pdf<span class="kw">-&gt;</span>AddPage<span class="kw">();
</span>$pdf<span class="kw">-&gt;</span>SetLink<span class="kw">(</span>$link<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>Image<span class="kw">(</span><span class="str">'logo.png'</span><span class="kw">,</span>10<span class="kw">,</span>12<span class="kw">,</span>30<span class="kw">,</span>0<span class="kw">,</span><span class="str">''</span><span class="kw">,</span><span class="str">'http://www.fpdf.org'</span><span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>SetLeftMargin<span class="kw">(</span>45<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>SetFontSize<span class="kw">(</span>14<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>WriteHTML<span class="kw">(</span>$html<span class="kw">);
</span>$pdf<span class="kw">-&gt;</span>Output<span class="kw">();
</span>?&gt;</code></pre>
</div>
<p class='demo'><a href='tuto6.php' target='_blank' class='demo'>[Demo]</a></p>
Il nuovo metodo per mostrare il testo è <a href='../doc/write.htm'>Write()</a>. È molto simile a <a href='../doc/multicell.htm'>MultiCell()</a>; le differenze sono:
<ul>
<li>La fine della linea è al margine destro ed il testo inizia al margine a sinistra</li>
<li>The current position moves at the end of the text</li>
</ul>
Quindi per permettere di scrivere del testo, alterare lo stile del carattere, quindi continuare dal punto esatto
dove eravamo rimasti. Purtroppo però non si può giustificare il testo.
<br>
<br>
Il metodo è utilizzato sulla prima pagina per inserire un link che punti alla seconda pagina. L'inizio
della frase è scritto in testo normale, quindi si cambia in sottolineato e si conclude. Il link
è creato con <a href='../doc/addlink.htm'>AddLink()</a>, che ritorna un identificatore per il link. L'identificatore è
passato come terzo parametro di Write(). Una volta che la seconda pagina è creata, usiamo <a href='../doc/setlink.htm'>SetLink()</a> per
creare un link che punti all'inizio della pagina corrente.
<br>
<br>
Quindi inseriamo un'immagine con un link esterno su di essa. Un link esterno è semplicemente un URL. È passato come
ultimo parametro di <a href='../doc/image.htm'>Image()</a>.
<br>
<br>
Concludendo, il margine sinistro si sposta dopo l'immagine con <a href='../doc/setleftmargin.htm'>SetLeftMargin()</a> e del testo è mostrato in
formato HTML. È utilizzato un parser HTML molto semplice per questo scopo, basato su espressioni regolari.
I tag riconosciuti sono &lt;b&gt;, &lt;i&gt;, &lt;u&gt;, &lt;a&gt; e &lt;br&gt;; gli altri sono
ignorati. Il parser fa anche uso del metodo Write(). Un link esterno è inserito allo stesso modo di
uno interno (terzo parametro di Write()). Notare che anche <a href='../doc/cell.htm'>Cell()</a> permette di inserire link.
</body>
</html>
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