scratch-vm/src/blocks/scratch3_event.js
2016-10-24 11:02:19 -04:00

89 lines
2.6 KiB
JavaScript

var Cast = require('../util/cast');
var Scratch3EventBlocks = function (runtime) {
/**
* The runtime instantiating this block package.
* @type {Runtime}
*/
this.runtime = runtime;
};
/**
* Retrieve the block primitives implemented by this package.
* @return {Object.<string, Function>} Mapping of opcode to Function.
*/
Scratch3EventBlocks.prototype.getPrimitives = function () {
return {
event_broadcast: this.broadcast,
event_broadcastandwait: this.broadcastAndWait,
event_whengreaterthan: this.hatGreaterThanPredicate
};
};
Scratch3EventBlocks.prototype.getHats = function () {
return {
event_whenflagclicked: {
restartExistingThreads: true
},
event_whenkeypressed: {
restartExistingThreads: false
},
event_whenthisspriteclicked: {
restartExistingThreads: true
},
event_whenbackdropswitchesto: {
restartExistingThreads: true
},
event_whengreaterthan: {
restartExistingThreads: false,
edgeActivated: true
},
event_whenbroadcastreceived: {
restartExistingThreads: true
}
};
};
Scratch3EventBlocks.prototype.hatGreaterThanPredicate = function (args, util) {
var option = Cast.toString(args.WHENGREATERTHANMENU).toLowerCase();
var value = Cast.toNumber(args.VALUE);
// @todo: Other cases :)
if (option === 'timer') {
return util.ioQuery('clock', 'projectTimer') > value;
}
return false;
};
Scratch3EventBlocks.prototype.broadcast = function (args, util) {
var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
util.startHats('event_whenbroadcastreceived', {
BROADCAST_OPTION: broadcastOption
});
};
Scratch3EventBlocks.prototype.broadcastAndWait = function (args, util) {
var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
// Have we run before, starting threads?
if (!util.stackFrame.startedThreads) {
// No - start hats for this broadcast.
util.stackFrame.startedThreads = util.startHats(
'event_whenbroadcastreceived', {
BROADCAST_OPTION: broadcastOption
}
);
if (util.stackFrame.startedThreads.length === 0) {
// Nothing was started.
return;
}
}
// We've run before; check if the wait is still going on.
var instance = this;
var waiting = util.stackFrame.startedThreads.some(function (thread) {
return instance.runtime.isActiveThread(thread);
});
if (waiting) {
util.yield();
}
};
module.exports = Scratch3EventBlocks;