| 11 | } |
| 12 | |
| 13 | export class BindingObserver implements ValueListObserverDelegate<Action> { |
| 14 | readonly context: Context |
| 15 | private delegate: BindingObserverDelegate |
| 16 | private valueListObserver?: ValueListObserver<Action> |
| 17 | private bindingsByAction: Map<Action, Binding> |
| 18 | |
| 19 | constructor(context: Context, delegate: BindingObserverDelegate) { |
| 20 | this.context = context |
| 21 | this.delegate = delegate |
| 22 | this.bindingsByAction = new Map() |
| 23 | } |
| 24 | |
| 25 | start() { |
| 26 | if (!this.valueListObserver) { |
| 27 | this.valueListObserver = new ValueListObserver(this.element, this.actionAttribute, this) |
| 28 | this.valueListObserver.start() |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | stop() { |
| 33 | if (this.valueListObserver) { |
| 34 | this.valueListObserver.stop() |
| 35 | delete this.valueListObserver |
| 36 | this.disconnectAllActions() |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | get element() { |
| 41 | return this.context.element |
| 42 | } |
| 43 | |
| 44 | get identifier() { |
| 45 | return this.context.identifier |
| 46 | } |
| 47 | |
| 48 | get actionAttribute() { |
| 49 | return this.schema.actionAttribute |
| 50 | } |
| 51 | |
| 52 | get schema(): Schema { |
| 53 | return this.context.schema |
| 54 | } |
| 55 | |
| 56 | get bindings(): Binding[] { |
| 57 | return Array.from(this.bindingsByAction.values()) |
| 58 | } |
| 59 | |
| 60 | private connectAction(action: Action) { |
| 61 | const binding = new Binding(this.context, action) |
| 62 | this.bindingsByAction.set(action, binding) |
| 63 | this.delegate.bindingConnected(binding) |
| 64 | } |
| 65 | |
| 66 | private disconnectAction(action: Action) { |
| 67 | const binding = this.bindingsByAction.get(action) |
| 68 | if (binding) { |
| 69 | this.bindingsByAction.delete(action) |
| 70 | this.delegate.bindingDisconnected(binding) |
nothing calls this directly
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