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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | 7x 7x 7x | <script> const broadcast = function (condition, eventName, ...args) { this.$children.forEach(($child) => { if (condition($child)) $child.$emit(eventName, ...args); else broadcast.apply($child, [condition, eventName].concat(args)); }); }; export default { name: 'm-emitter', methods: { $dispatch(condition, eventName, ...args) { if (typeof condition === 'string') { const name = condition; condition = ($parent) => $parent.$options.name === name; } let $parent = this.$parent || this.$root; while ($parent && !condition($parent)) $parent = $parent.$parent; $parent && $parent.$emit(eventName, ...args); }, $broadcast(condition, eventName, ...args) { if (typeof condition === 'string') { const name = condition; condition = ($child) => $child.$options.name === name; } broadcast.apply(this, [condition, eventName].concat(args)); }, $contact(condition, callback) { if (typeof condition === 'string') { const name = condition; condition = ($parent) => $parent.$options.name === name; } let $parent = this.$parent || this.$root; while ($parent && !condition($parent)) $parent = $parent.$parent; return $parent && callback($parent); }, $emitPrevent(name, $event, senderVM, ...args) { let cancel = false; this.$emit( name, Object.assign($event || {}, { preventDefault: () => (cancel = true), }), senderVM, ...args, ); return cancel; }, }, }; </script> |