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-Newbie Friendly Perl Projects
+Once in a while .... (set_event_filter)
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-<div style="text-align: right;"><i>A seed needs soft soil and water to grow</i></div><div style="text-align: right;"></div>This is a reply to <a href="http://szabgab.com/blog/2009/09/1251862435.html">szabgab's</a> post on how to get newbies interested in Perl modules. Being a newbie in Perl myself I thought I should take a shot.<br /><br />I was thinking you can make projects more accessible to newbies by having a step by step plan included with where they need to look. For example for docs of SDL_perl:<br /><ol><li>Look at SDL docs [<a href="http://www.libsdl.org/cgi/docwiki.cgi/SDL_API_by_name">link</a>]</li><li>See where SDL_perl is using the same functions [<a href="http://cpansearch.perl.org/src/KTHAKORE/SDL_Perl-v2.2.2.11/src/SDL.xs">link</a>] and the docs to this file [<a href="http://cpansearch.perl.org/src/KTHAKORE/SDL_Perl-v2.2.2.11/lib/SDL.pm">link</a>]</li><li>Use the pod format to add it to the source [<a href="http://perldoc.perl.org/perlpod.html">link to using pod</a>]</li><li>{BONUS} Come up with tutorial or cookbook [<a href="http://search.cpan.org/%7Edrolsky/Moose-0.89/lib/Moose/Cookbook.pod">link to example</a>]</li><li>Submit code to github [<a href="http://github.com/guides/home">link</a>] or email them to me [<a href="mailto:kthakore@cpan.org">link</a>]<br /></li></ol><br />Basically assume nothing is known. I know this may seem demeaning but I am a newbie to Perl and sometimes I hate looking for crust (docs). I call it crust because a crust is useful for me to eat a pizza slice, but it has no flavor .<br /><br /><i>--yapgh </i><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-581981098917545448?l=yapgh.blogspot.com' alt='' /></div></div></div>
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+<div style="text-align: right;"><i> <br />
+Once in a while <br />
+Things just work! <br />
+</i><br />
+</div><br />
+<br />
+So I have been hacking for a while on SDL::Events::set_event_filter. The code below is an example usage. The magic behind this is <a href="http://github.com/kthakore/SDL_perl/blob/1712fe42d62c2a3e382e6bf91366eb2ce9d2f5f4/src/Core/Events.xs">here</a> <br />
+<br />
+<pre><a href="" name="line1"> 1</a> <span style="color: #444444;">#!/usr/bin/perl -w
+<a href="" name="line2"> 2</a> </span><b>use</b> strict;
+<a href="" name="line3"> 3</a> <b>use</b> warnings;
+<a href="" name="line4"> 4</a> <b>use</b> SDL v2.3; <span style="color: #444444;">#Require the redesign branch
+<a href="" name="line5"> 5</a> </span><b>use</b> SDL::Video;
+<a href="" name="line6"> 6</a> <b>use</b> SDL::Event;
+<a href="" name="line7"> 7</a> <b>use</b> SDL::Events;
+<a href="" name="line8"> 8</a>
+<a href="" name="line9"> 9</a> SDL::init<span style="color: #4444ff;"><b>(</b></span>SDL_INIT_VIDEO<span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line10">10</a> <b>my</b> <span style="color: #2040a0;">$display</span> = SDL::Video::set_video_mode<span style="color: #4444ff;"><b>(</b></span>640,480,32, SDL_SWSURFACE <span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line11">11</a> <b>my</b> <span style="color: #2040a0;">$event</span> = SDL::Event-><b>new</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line12">12</a>
+<a href="" name="line13">13</a> <span style="color: #444444;">#This filters out all ActiveEvents
+<a href="" name="line14">14</a> </span><b>my</b> <span style="color: #2040a0;">$filter</span> = sub <span style="color: #4444ff;"><b>{</b></span>
+<a href="" name="line15">15</a> <b>my</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$e</span>, <span style="color: #2040a0;">$type</span><span style="color: #4444ff;"><b>)</b></span> = <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$_</span><span style="color: #4444ff;"><b>[</b></span>0<span style="color: #4444ff;"><b>]</b></span>, <span style="color: #2040a0;">$_</span><span style="color: #4444ff;"><b>[</b></span>0<span style="color: #4444ff;"><b>]</b></span>->type<span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line16">16</a> <b>if</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$type</span> == SDL_ACTIVEEVENT<span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>{</b></span> <b>return</b> 0 <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line17">17</a> <b>elsif</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$type</span> == SDL_MOUSEBUTTONDOWN && <span style="color: #2040a0;">$e</span>->button_button == 1<span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>{</b></span> <b>return</b> 0 <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line18">18</a> <b>else</b> <span style="color: #4444ff;"><b>{</b></span> <b>return</b> 1; <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line19">19</a> <span style="color: #4444ff;"><b>}</b></span>;
+<a href="" name="line20">20</a>
+<a href="" name="line21">21</a> SDL::Events::set_event_filter<span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$filter</span><span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line22">22</a>
+<a href="" name="line23">23</a> <b>while</b><span style="color: #4444ff;"><b>(</b></span>1<span style="color: #4444ff;"><b>)</b></span>
+<a href="" name="line24">24</a> <span style="color: #4444ff;"><b>{</b></span>
+<a href="" name="line25">25</a>
+<a href="" name="line26">26</a> SDL::Events::pump_events<span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line27">27</a> <b>if</b><span style="color: #4444ff;"><b>(</b></span>SDL::Events::poll_event<span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span><span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>)</b></span>
+<a href="" name="line28">28</a> <span style="color: #4444ff;"><b>{</b></span>
+<a href="" name="line29">29</a>
+<a href="" name="line30">30</a> <b>if</b><span style="color: #4444ff;"><b>(</b></span> <span style="color: #2040a0;">$event</span>->type == SDL_ACTIVEEVENT<span style="color: #4444ff;"><b>)</b></span>
+<a href="" name="line31">31</a> <span style="color: #4444ff;"><b>{</b></span>
+<a href="" name="line32">32</a> <span style="color: brown;"><b>print</b></span> <span style="color: green;">"Hello Mouse!!!<span style="color: #77dd77;">\n</span>"</span> <b>if</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>->active_gain && <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>->active_state == SDL_APPMOUSEFOCUS<span style="color: #4444ff;"><b>)</b></span> <span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line33">33</a> <span style="color: brown;"><b>print</b></span> <span style="color: green;">"Bye Mouse!!!<span style="color: #77dd77;">\n</span>"</span> <b>if</b> <span style="color: #4444ff;"><b>(</b></span>!<span style="color: #2040a0;">$event</span>->active_gain && <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>->active_state == SDL_APPMOUSEFOCUS<span style="color: #4444ff;"><b>)</b></span> <span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line34">34</a> <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line35">35</a> <b>if</b><span style="color: #4444ff;"><b>(</b></span> <span style="color: #2040a0;">$event</span>->type == SDL_MOUSEBUTTONDOWN<span style="color: #4444ff;"><b>)</b></span>
+<a href="" name="line36">36</a> <span style="color: #4444ff;"><b>{</b></span>
+<a href="" name="line37">37</a> <b>my</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$x</span>, <span style="color: #2040a0;">$y</span>, <span style="color: #2040a0;">$but</span> <span style="color: #4444ff;"><b>)</b></span> = <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>->button_x, <span style="color: #2040a0;">$event</span>->button_y, <span style="color: #2040a0;">$event</span>->button_button<span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line38">38</a> <span style="color: brown;"><b>warn</b></span> <span style="color: green;">"<span style="color: #2040a0;">$but</span> CLICK!!! at <span style="color: #2040a0;">$x</span> and <span style="color: #2040a0;">$y</span> <span style="color: #77dd77;">\n</span>"</span>;
+<a href="" name="line39">39</a> <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line40">40</a>
+<a href="" name="line41">41</a> <b>last</b> <b>if</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>->type == SDL_QUIT<span style="color: #4444ff;"><b>)</b></span>;
+<a href="" name="line42">42</a> <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line43">43</a> <span style="color: #4444ff;"><b>}</b></span>
+<a href="" name="line44">44</a> SDL::quit<span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>; </pre><pre> </pre><pre> </pre><pre>Tinker with $filter and look at perldoc lib/SDL/pods/Event.pod. </pre><pre> </pre><pre>Have fun,</pre><pre>--yapgh</pre><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-2301663122914111362?l=yapgh.blogspot.com' alt='' /></div>
+<p><a href="http://feedads.g.doubleclick.net/~a/e5FjkjzCKI5FggkvV6c3mlOMCG4/0/da"><img src="http://feedads.g.doubleclick.net/~a/e5FjkjzCKI5FggkvV6c3mlOMCG4/0/di" border="0" ismap="true"></img></a><br/>
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