Prototypal inheritance of sprite-local variables

(experimental) slotwise inheritance à la Henry Lieberman for
sprite-local variables.

see
http://web.media.mit.edu/~lieber/Lieberary/OOP/Delegation/Delegation.htm
l

Let a sprite inherit another sprite’s local variables by making it the
“parent” in the sprite-icon’s context menu (the button icon in the
sprite corral underneath the stage). The child not only inherits the
variable slot but also - dynamically - the parent variable’s value.
Changing the parent’s variable value also changes it for every child.
If a child uses SET or CHANGE on an inherited variable it automatically
“shadows” it with its own value, thereby stopping dynamic participation
in the parent slot’s value (in effect dis-inheriting that slot).
Deleting a shadowed variable slot once again reinstates its inheritance
status.

inherited variables are shown as “ghosted” both in the child’s
variables palette and in such stage watchers. “Shadowing” them
un-ghosts both the variable blob template in the palette and the
watcher onstage (if any). Deleting a shadowed variable once again
ghosts the watcher and the palette block template.

Delete a (shadowed) variable either via the “Delete a variable” button
in the IDE or using the new “Delete” block in the variables category

1 files changed, 11 insertions, 1 deletions

diff --git a/blocks.js b/blocks.js
index aef09da..711976f 100644
--- a/blocks.js
+++ b/blocks.js
@@ -155,7 +155,7 @@ DialogBoxMorph, BlockInputFragmentMorph, PrototypeHatBlockMorph, Costume*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2015-March-09';
+modules.blocks = '2015-March-21';
 
 
 var SyntaxElementMorph;
@@ -3016,6 +3016,12 @@ BlockMorph.prototype.alternateBlockColor = function () {
     this.fixChildrensBlockColor(true); // has issues if not forced
 };
 
+BlockMorph.prototype.ghost = function () {
+    this.setColor(
+        SpriteMorph.prototype.blockColor[this.category].lighter(35)
+    );
+};
+
 BlockMorph.prototype.fixLabelColor = function () {
     if (this.zebraContrast > 0 && this.category) {
         var clr = SpriteMorph.prototype.blockColor[this.category];
@@ -3096,6 +3102,10 @@ BlockMorph.prototype.mouseClickLeft = function () {
     }
 };
 
+BlockMorph.prototype.reactToTemplateCopy = function () {
+    this.forceNormalColoring();
+};
+
 // BlockMorph thumbnail
 
 BlockMorph.prototype.thumbnail = function (scale, clipWidth, noShadow) {