thr3ads.net - wxruby development - [Wxruby-development] [1044] trunk/wxruby2: Special memory management for Wx::Grid [Jun 2007]

If this information is useful, please help other people find it:
Share via:
nobody at rubyforge.org
2007-Jun-01 16:21 UTC
[Wxruby-development] [1044] trunk/wxruby2: Special memory management for Wx::Grid

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="content-type"
content="text/html; charset=utf-8" /><style
type="text/css"><!--
#msg dl { border: 1px #006 solid; background: #369; padding: 6px; color: #fff; }
#msg dt { float: left; width: 6em; font-weight: bold; }
#msg dt:after { content:'':'';}
#msg dl, #msg dt, #msg ul, #msg li, #header, #footer { font-family:
verdana,arial,helvetica,sans-serif; font-size: 10pt;  }
#msg dl a { font-weight: bold}
#msg dl a:link    { color:#fc3; }
#msg dl a:active  { color:#ff0; }
#msg dl a:visited { color:#cc6; }
h3 { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt;
font-weight: bold; }
#msg pre { overflow: auto; background: #ffc; border: 1px #fc0 solid; padding:
6px; }
#msg ul, pre { overflow: auto; }
#header, #footer { color: #fff; background: #636; border: 1px #300 solid;
padding: 6px; }
#patch { width: 100%; }
#patch h4 {font-family:
verdana,arial,helvetica,sans-serif;font-size:10pt;padding:8px;background:#369;color:#fff;margin:0;}
#patch .propset h4, #patch .binary h4 {margin:0;}
#patch pre {padding:0;line-height:1.2em;margin:0;}
#patch .diff {width:100%;background:#eee;padding: 0 0 10px 0;overflow:auto;}
#patch .propset .diff, #patch .binary .diff  {padding:10px 0;}
#patch span {display:block;padding:0 10px;}
#patch .modfile, #patch .addfile, #patch .delfile, #patch .propset, #patch
.binary, #patch .copfile {border:1px solid #ccc;margin:10px 0;}
#patch ins {background:#dfd;text-decoration:none;display:block;padding:0 10px;}
#patch del {background:#fdd;text-decoration:none;display:block;padding:0 10px;}
#patch .lines, .info {color:#888;background:#fff;}
--></style>
<title>[1044] trunk/wxruby2: Special memory management for
Wx::Grid</title>
</head>
<body>

<div id="msg">
<dl>
<dt>Revision</dt> <dd>1044</dd>
<dt>Author</dt> <dd>brokentoy</dd>
<dt>Date</dt> <dd>2007-06-01 12:21:13 -0400 (Fri, 01 Jun
2007)</dd>
</dl>

<h3>Log Message</h3>
<pre>Special memory management for Wx::Grid</pre>

<h3>Modified Paths</h3>
<ul>
<li><a
href="#trunkwxruby2swigclassesGridi">trunk/wxruby2/swig/classes/Grid.i</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a
href="#trunkwxruby2libwxclassesgridrb">trunk/wxruby2/lib/wx/classes/grid.rb</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkwxruby2libwxclassesgridrb"></a>
<div class="addfile"><h4>Added:
trunk/wxruby2/lib/wx/classes/grid.rb (0 => 1044)</h4>
<pre class="diff"><span>
<span class="info">---
trunk/wxruby2/lib/wx/classes/grid.rb&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
(rev 0)
+++
trunk/wxruby2/lib/wx/classes/grid.rb&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp2007-06-01
16:21:13 UTC (rev 1044)
</span><span class="lines">@@ -0,0 +1,52 @@
</span><ins>+# A data-oriented editable table control.
+class Wx::Grid
+  # The following extensions are all to prevent crashes associated with
+  # garbage collection of Grid-related classes; they do not extend the
+  # public functionality of the class in any way. 
+  # 
+  # The GridCellRenderers and GridCellEditors pose a problem for
ruby''s
+  # GC, in that Wx makes them owned by the grid once they have been set
+  # for a cell or group of cells. However, because they are SWIG
+  # directors we cannot allow the ruby object they are originally
+  # associated with to be swept by GC.
+  #
+  # So we keep track of editors and renderers that have been set for
+  # particular cells or as the default within hashes that are instance
+  # variables of the Grid object. This means that as long as the Grid is
+  # not garbage collected, the associated renderers will be marked in
+  # the GC mark phase and so preserved.
+  #
+  # For most classes we handle GC on the SWIG side but honestly it''d
be
+  # a whole lot more messy coding... 
+  wx_init = self.instance_method(:initialize)
+  define_method(:initialize) do | *args |
+    wx_init.bind(self).call(*args)
+
+    @__renderers = {}
+    @__editors   = {}
+  end
+
+  wx_set_cell_renderer = self.instance_method(:set_cell_renderer)
+  define_method(:set_cell_renderer) do | row, col, rendr |
+    wx_set_cell_renderer.bind(self).call(row, col, rendr)
+    @__renderers[ [row, col] ] = rendr
+  end
+
+  wx_set_default_renderer = self.instance_method(:set_default_renderer)
+  define_method(:set_default_renderer) do | rendr |
+    wx_set_default_renderer.bind(self).call(rendr)
+    @__renderers[ nil ] = rendr
+  end
+
+  wx_set_cell_editor = self.instance_method(:set_cell_editor)
+  define_method(:set_cell_editor) do | row, col, editr |
+    wx_set_cell_editor.bind(self).call(row, col, editr)
+    @__editors[ [row, col] ] = editr
+  end
+
+  wx_set_default_editor = self.instance_method(:set_default_editor)
+  define_method(:set_default_editor) do | editr |
+    wx_set_default_editor.bind(self).call(editr)
+    @__editors[ nil ] = editr
+  end
+end
</ins></span></pre></div>
<a id="trunkwxruby2swigclassesGridi"></a>
<div class="modfile"><h4>Modified:
trunk/wxruby2/swig/classes/Grid.i (1043 => 1044)</h4>
<pre class="diff"><span>
<span class="info">---
trunk/wxruby2/swig/classes/Grid.i&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp2007-05-31
21:20:41 UTC (rev 1043)
+++
trunk/wxruby2/swig/classes/Grid.i&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp2007-06-01
16:21:13 UTC (rev 1044)
</span><span class="lines">@@ -10,6 +10,10 @@
</span><span class="cx"> #include <wx/grid.h>
</span><span class="cx"> %}
</span><span class="cx"> 
</span><ins>+
+// Memory management is needed for these classes in addition to *DISOWN
+// to prevent premature ruby GC. To save a lot of messy C++ The work is
+// done in pure ruby - see lib/wx/classes/grid.rb
</ins><span class="cx"> %apply SWIGTYPE *DISOWN {
wxGridCellAttr* attr };
</span><span class="cx"> %apply SWIGTYPE *DISOWN {
wxGridCellEditor* editor };
</span><span class="cx"> %apply SWIGTYPE *DISOWN {
wxGridCellRenderer* renderer };
</span></span></pre>
</div>
</div>

</body>
</html>
Reasonably Related Threads

Search for more seemingly similar threads
wxruby development - Jun 2007 - [1044] trunk/wxruby2: Special memory management for Wx::Grid

[Wxruby-development] [1044] trunk/wxruby2: Special memory management for Wx::Grid

Reasonably Related Threads

Wisdom of the Ancients
