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Observer usage
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<h1>
HTML_Progress2 : The Definitive Guide
</h1>
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Observer usage
</th>
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Chapter 21. Examples
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<h2 class="title c1">
<a name="examples.observer" id="examples.observer"></a>Observer usage
</h2>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2"><a href=
"ch21s04.html#examples.observer.1"></a></span>
</dt>
</dl>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage"></div>
<div class="figure">
<a name="id4848776" id="id4848776"></a>
<p class="title c2">
Figure 21.4. Progress as a listener to Event_Dispatcher
</p>
<div class="screenshot">
<img src="img/observer3.png" alt=
"Progress as a listener to Event_Dispatcher" />
</div>
</div>
<p>
This example show how to implement the ProgressMeter Event_Dispatcher
to listen user-process (simulation of mail send) that decide to
refresh itself the progress bar.
</p>
<div class="warning c3">
<table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="48">
<img alt="[Warning]" src="img/admons/warning.png" />
</td>
<th align="left">
Warning
</th>
</tr>
<tr>
<td align="left" valign="top">
This example requires at least the version 2.1.0 of
HTML_Progress2
</td>
</tr>
</table>
</div>
<div class="example">
<a name="id4848816" id="id4848816"></a>
<p class="title c2">
Example 21.4. Progress bar listen to user process
</p>
<div class="php c4">
<ol>
<li class="li1">
<div class="de1">
<span class="kw2"><?php</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw1">require_once</span> <span class=
"st0">'HTML/Progress2.php'</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">class</span> myClass
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">function</span>
doSomething<span class="br0">(</span><span class=
"br0">)</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$usecs</span>
<span class="sy0">=</span> <span class="nu0">1000</span>
<span class="sy0">*</span> <span class=
"nu0">1000</span><span class="sy0">;</span>
<span class="co1">// wait 1 seconde</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$dispatch</span>
<span class="sy0">=&</span> Event_Dispatcher<span class=
"sy0">::</span><span class=
"me2">getInstance</span><span class=
"br0">(</span><span class="st0">'ProgressMeter'</span><span class="br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="co1">// A long task
to do ... for example sending 10 mails</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw1">for</span>
<span class="br0">(</span><span class="re1">$i</span>
<span class="sy0">=</span> <span class=
"nu0">0</span><span class="sy0">;</span> <span class=
"re1">$i</span> <span class="sy0"><</span> <span class=
"nu0">10</span><span class="sy0">;</span> <span class=
"sy0">++</span><span class="re1">$i</span><span class=
"br0">)</span> <span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="co1">//
simulate by a sleep 1 sec function</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"kw1">if</span> <span class="br0">(</span><span class=
"br0">(</span><span class="kw3">substr</span><span class=
"br0">(</span><span class="kw2">PHP_OS</span><span class=
"sy0">,</span> <span class="nu0">0</span><span class=
"sy0">,</span> <span class="nu0">3</span><span class=
"br0">)</span> <span class="sy0">==</span> <span class=
"st0">'WIN'</span><span class="br0">)</span> <span class=
"sy0">&&</span> <span class=
"br0">(</span><span class="kw3">substr</span><span class=
"br0">(</span><span class=
"kw2">PHP_VERSION</span><span class="sy0">,</span><span class="nu0">0</span><span class="sy0">,</span><span class="nu0">1</span><span class="br0">)</span>
<span class="sy0"><</span> <span class=
"st0">'5'</span><span class="br0">)</span> <span class=
"br0">)</span><span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw1">for</span> <span class=
"br0">(</span><span class="re1">$w</span> <span class=
"sy0">=</span> <span class="nu0">0</span><span class=
"sy0">;</span> <span class="re1">$w</span> <span class=
"sy0"><</span> <span class="re1">$usecs</span><span class=
"sy0">;</span> <span class="re1">$w</span><span class=
"sy0">++</span><span class="br0">)</span> <span class=
"br0">{</span> <span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"br0">}</span> <span class="kw1">else</span> <span class=
"br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw3">usleep</span><span class=
"br0">(</span><span class="re1">$usecs</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"br0">}</span> <span class="co1">//</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$dispatch</span><span class=
"sy0">-></span><span class="me1">post</span><span class=
"br0">(</span><span class="re1">$this</span><span class=
"sy0">,</span> <span class="st0">'onTick'</span><span class=
"sy0">,</span> <span class="kw3">array</span><span class=
"br0">(</span><span class="re1">$i</span><span class=
"br0">)</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">class</span> myBar <span class=
"kw2">extends</span> HTML_Progress2
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">function</span>
myBar<span class="br0">(</span><span class="br0">)</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
parent<span class=
"sy0">::</span><span class=
"me2">HTML_Progress2</span><span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$this</span><span class="sy0">-></span><span class=
"me1">setIncrement</span><span class=
"br0">(</span><span class="nu0">10</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$this</span><span class="sy0">-></span><span class=
"me1">addLabel</span><span class=
"br0">(</span>HTML_PROGRESS2_LABEL_TEXT<span class=
"sy0">,</span> <span class="st0">'txt1'</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$this</span><span class="sy0">-></span><span class=
"me1">setLabelAttributes</span><span class=
"br0">(</span><span class="st0">'txt1'</span><span class=
"sy0">,</span> <span class="kw3">array</span><span class=
"br0">(</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"st0">'valign'</span> <span class="sy0">=></span>
<span class="st0">'top'</span><span class="sy0">,</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"st0">'left'</span> <span class="sy0">=></span>
<span class="nu0">0</span><span class="sy0">,</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"br0">)</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">function</span>
notify<span class="br0">(</span><span class=
"sy0">&</span><span class=
"re1">$notification</span><span class="br0">)</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$notifyName</span> <span class="sy0">=</span>
<span class="re1">$notification</span><span class=
"sy0">-></span><span class=
"me1">getNotificationName</span><span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw1">if</span>
<span class="br0">(</span><span class=
"kw3">strcasecmp</span><span class="br0">(</span><span class=
"re1">$notifyName</span><span class="sy0">,</span>
<span class="st0">'onTick'</span><span class="br0">)</span>
<span class="sy0">==</span> <span class=
"nu0">0</span><span class="br0">)</span> <span class=
"br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$notifyInfo</span> <span class="sy0">=</span>
<span class="re1">$notification</span><span class=
"sy0">-></span><span class=
"me1">getNotificationInfo</span><span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"kw1">if</span> <span class="br0">(</span><span class=
"re1">$notifyInfo</span><span class=
"br0">[</span><span class="nu0">0</span><span class=
"br0">]</span> <span class="sy0">==</span> <span class=
"nu0">0</span><span class="br0">)</span> <span class=
"br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$this</span><span class=
"sy0">-></span><span class=
"me1">setLabelAttributes</span><span class=
"br0">(</span><span class="st0">'txt1'</span><span class=
"sy0">,</span> <span class="kw3">array</span><span class=
"br0">(</span><span class="st0">'value'</span> <span class=
"sy0">=></span> <span class="st0">'Sending mail
...'</span><span class="br0">)</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"br0">}</span> <span class="kw1">elseif</span> <span class=
"br0">(</span><span class=
"re1">$notifyInfo</span><span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>
<span class="sy0">==</span> <span class=
"nu0">9</span><span class="br0">)</span> <span class=
"br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$this</span><span class=
"sy0">-></span><span class=
"me1">setLabelAttributes</span><span class=
"br0">(</span><span class="st0">'txt1'</span><span class=
"sy0">,</span> <span class="kw3">array</span><span class=
"br0">(</span><span class="st0">'value'</span> <span class=
"sy0">=></span> <span class="st0">'Mail sent with
success.'</span><span class="br0">)</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"re1">$this</span><span class="sy0">-></span><span class=
"me1">moveNext</span><span class="br0">(</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$bar</span> <span class="sy0">=</span>
<span class="kw2">new</span> myBar<span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$bar</span><span class=
"sy0">-></span><span class=
"me1">addListener</span><span class=
"br0">(</span><span class="kw3">array</span><span class=
"br0">(</span><span class="sy0">&</span><span class=
"re1">$bar</span><span class="sy0">,</span> <span class=
"st0">'notify'</span><span class="br0">)</span><span class=
"sy0">,</span> <span class="st0">'onTick'</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">?></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><!</span>DOCTYPE html <span class=
"kw2">PUBLIC</span> <span class="st0">"-//W3C//DTD XHTML 1.0
Strict//EN"</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class=
"st0">"http://www.w3c.org/TR/xhtml1/DTD/xhtml1-strict.dtd"</span><span class="sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><</span>html xmlns<span class=
"sy0">=</span><span class=
"st0">"http://www.w3.org/1999/xhtml"</span> xml<span class=
"sy0">:</span>lang<span class="sy0">=</span><span class=
"st0">"en"</span><span class="sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><</span>head<span class=
"sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><</span>title<span class=
"sy0">></span>doSomething<span class=
"sy0"></</span>title<span class="sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><</span>style type<span class=
"sy0">=</span><span class="st0">"text/css"</span><span class=
"sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><!--</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2"><?php</span> <span class=
"kw3">echo</span> <span class="re1">$bar</span><span class=
"sy0">-></span><span class=
"me1">getStyle</span><span class="br0">(</span><span class=
"br0">)</span><span class="sy0">;</span> <span class=
"kw2">?></span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
body <span class="br0">{</span>
</div>
</li>
<li class="li1">
<div class="de1">
background<span class=
"sy0">-</span>color<span class="sy0">:</span> <span class=
"co2">#FFFFFF;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="br0">}</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0">--></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"></</span>style<span class=
"sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2"><?php</span> <span class=
"kw3">echo</span> <span class="re1">$bar</span><span class=
"sy0">-></span><span class=
"me1">getScript</span><span class="br0">(</span><span class=
"kw2">false</span><span class="br0">)</span><span class=
"sy0">;</span> <span class="kw2">?></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"></</span>head<span class=
"sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="sy0"><</span>body<span class=
"sy0">></span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2"><?php</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$bar</span><span class=
"sy0">-></span><span class=
"me1">display</span><span class="br0">(</span><span class=
"br0">)</span><span class="sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$process</span> <span class="sy0">=</span>
<span class="kw2">new</span> myClass<span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="re1">$process</span><span class=
"sy0">-></span><span class=
"me1">doSomething</span><span class=
"br0">(</span><span class="br0">)</span><span class=
"sy0">;</span>
</div>
</li>
<li class="li1">
<div class="de1">
<span class="kw2">?></span>
</div>
</li>
<li class="li1">
<div class="de1">
</div>
</li>
<li class="li1">
<div class="de1">
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