From 4acf1896bd9fa57d3dbe3f4721b6790c6f3b0d56 Mon Sep 17 00:00:00 2001 From: Jens Mönig Date: Sat, 21 Mar 2015 11:12:43 +0100 Subject: Prototypal inheritance of sprite-local variables MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit (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 --- history.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'history.txt') diff --git a/history.txt b/history.txt index b53e59c..e02d368 100755 --- a/history.txt +++ b/history.txt @@ -2476,3 +2476,7 @@ ______ ------ * Store: fixed #743 * GUI, html: switch from beta to release candidate + +150321 +------ +* OOP: Prototypal inheritance of sprite-local variables -- cgit v1.3.1