Revision: 3739
http://vexi.svn.sourceforge.net/vexi/?rev=3739&view=rev
Author: mkpg2
Date: 2009-11-02 14:41:14 +0000 (Mon, 02 Nov 2009)
Log Message:
-----------
LazyProp utility trap function.
Modified Paths:
--------------
trunk/widgets/org.vexi.widgets/src/vexi/util/common.t
Modified: trunk/widgets/org.vexi.widgets/src/vexi/util/common.t
===================================================================
--- trunk/widgets/org.vexi.widgets/src/vexi/util/common.t 2009-11-02
14:10:34 UTC (rev 3738)
+++ trunk/widgets/org.vexi.widgets/src/vexi/util/common.t 2009-11-02
14:41:14 UTC (rev 3739)
@@ -12,6 +12,14 @@
static.noWriteTrap = function(v) { throw "unsupported write: "+trapname+"
= "+v; return; }
static.nullIllegal = function(v) { if (v==null) throw "null value illegal
for '"+trapname+"'"; cascade = v; }
static.readOnly = function(v) { throw "property '"+trapname+"' is read
only"; return; }
+ static.lazyProp = function(f) {
+ return function(){
+ var v = f();
+ trapee[trapname] = v;
+ trapee[trapname] --= callee;
+ return v;
+ };
+ };
static.logException = function(msg) {
try { throw msg; }
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