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| author | Jens Mönig <jens@moenig.org> | 2015-03-21 11:12:43 +0100 |
|---|---|---|
| committer | Jens Mönig <jens@moenig.org> | 2015-03-21 11:12:43 +0100 |
| commit | 4acf1896bd9fa57d3dbe3f4721b6790c6f3b0d56 (patch) | |
| tree | 8d44be9ed6bb5458d4354d59200783669dbc5cb2 /snap.html | |
| parent | fdd2ecf7d91d8026d3ca42c4bd52774877c72645 (diff) | |
| download | snap-4acf1896bd9fa57d3dbe3f4721b6790c6f3b0d56.tar.gz snap-4acf1896bd9fa57d3dbe3f4721b6790c6f3b0d56.zip | |
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
Diffstat (limited to 'snap.html')
| -rwxr-xr-x | snap.html | 2 |
1 files changed, 1 insertions, 1 deletions
@@ -2,7 +2,7 @@ <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> - <title>Snap! Build Your Own Blocks</title> + <title>Snap! Build Your Own Blocks. Development (OOP)</title> <link rel="shortcut icon" href="favicon.ico"> <script type="text/javascript" src="morphic.js"></script> <script type="text/javascript" src="widgets.js"></script> |