1 | import {bindingBehavior} from 'aurelia-binding';
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2 | import {BindingSignaler} from './binding-signaler';
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3 |
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4 | @bindingBehavior('signal')
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5 | export class SignalBindingBehavior {
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6 |
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7 |
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8 | static inject() { return [BindingSignaler]; }
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9 | signals;
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10 |
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11 | constructor(bindingSignaler) {
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12 | this.signals = bindingSignaler.signals;
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13 | }
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14 |
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15 | bind(binding, source, ...names) {
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16 | if (!binding.updateTarget) {
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17 | throw new Error('Only property bindings and string interpolation bindings can be signaled. Trigger, delegate and call bindings cannot be signaled.');
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18 | }
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19 | let signals = this.signals;
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20 | if (names.length === 1) {
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21 | let name = names[0];
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22 | let bindings = signals[name] || (signals[name] = []);
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23 | bindings.push(binding);
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24 | binding.signalName = name;
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25 | } else if (names.length > 1) {
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26 | let i = names.length;
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27 | while (i--) {
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28 | let name = names[i];
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29 | let bindings = signals[name] || (signals[name] = []);
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30 | bindings.push(binding);
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31 | }
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32 | binding.signalName = names;
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33 | } else {
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34 | throw new Error('Signal name is required.');
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35 | }
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36 | }
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37 |
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38 |
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39 | unbind(binding, source) {
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40 | let signals = this.signals;
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41 | let name = binding.signalName;
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42 | binding.signalName = null;
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43 | if (Array.isArray(name)) {
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44 | let names = name;
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45 | let i = names.length;
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46 | while (i--) {
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47 | let n = names[i];
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48 | let bindings = signals[n];
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49 | bindings.splice(bindings.indexOf(binding), 1);
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50 | }
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51 | } else {
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52 | let bindings = signals[name];
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53 | bindings.splice(bindings.indexOf(binding), 1);
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54 | }
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55 | }
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56 | }
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