Execution of separate blocks

[Руслан И.]

Hello! In blockly games, code is executed even if blocks are not connected with each other. 

So I have two questions:

1) Is there a way to check if there are unconnected blocks on workspace?

2) Is there a way to execute only upper most block on workspace and ignore the others?

[Neil Fraser]

Yes, if your program has a 'start' block of some sort, then you can add this line of code:

workspace.addChangeListener(Blockly.Events.disableOrphans);

Here is an example:

https://blockly-games.appspot.com/music

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Neil Fraser
https://neil.fraser.name

[Руслан И.]

Thank you! This was really helpful! 

By the way, can you please answer one more question: How to make start block look like "header that sit on top of a stack of blocks." ?

[Erik Pasternak]

Blockly.BlockSvg.START_HAT = true;

More details on this page of the docs.

Cheers,

Erik

[Руслан И.]

I've enabled START_HAT like you said.
Is it possible to change the look of start block from this :

into this:

[Erik Pasternak]

You can get the appearance of the second by using a next connection instead of a statement input, but the code generation won't wrap it like a function. https://github.com/google/blockly/issues/384 is tracking having the bottom rendering with generator support for wrapping it.