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nobody at rubyforge.org
2007-Jun-01 16:21 UTC
[Wxruby-development] [1044] trunk/wxruby2: Special memory management for Wx::Grid

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<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>
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