Type checker message

[STeEL]

Hi,

Does blockly type checker provide message when two blocks connected or disconnected because of type checker?

if it does, could you give me an example how to do it?

~STeEL

[Beka Westberg]

Hi STeEL,

> Does blockly type checker provide message when two blocks connected or disconnected because of type checker?

Hmm, do you mean like provide a message to the developer? Or provide a message to the user?

If you mean the former, technically the connection checker interface has a canConnectWithReason function that returns information about why an attempted connection failed, but you have to call it explicitly. For example the keyboard navigation code does this.

If you mean the latter, the simple answer is no :/ I think Blockly's philosophy is that if two blocks can't connect, the user should be able to figure out why from other info (eg the color of the block, its fields, connection shapes, etc).

However, if you do want to give some more information to the user you should be able to use the connection checker interface to do that. Eg if your type checks fail in doTypeChecks, you could send a message to a different system (which you build) that could display a message to the user.

I hope that helps! If you have any further questions please reply :D

--Beka

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[STeEL]

Thank you Beka,

I meant, block event like 'onchange' or 'compose' for mutator. Maybe, it is doTypeChecks from connection checker interface. BTW, can you give an example code how to use doTypeChecks or connection checker interface if I have block like:

Blockly.Blocks['var_setter'] = {

init: function() {

this.appendValueInput("input_value")

.setCheck("Number")

.appendField("set x to");

this.setPreviousStatement(true, null);

this.setNextStatement(true, null);

this.setColour(230);

this.setTooltip("");

this.setHelpUrl("");

}

};

~STeEL

[Beka Westberg]

> I meant, block event like 'onchange' or 'compose' for mutator. Maybe, it is doTypeChecks from connection checker interface.

Yeah there is not a function on the block (like `onchage` or `compose`) that gets called for this situation :/

After thinking about it for a while, I think doTypeChecks might not be right for your situation either. Your best bet is probably to create an event listener that watches for move events. Someone actually had a similar question to this yesterday which I answered here. I think it should work pretty well for your situation =)

Best,

Beka

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