'use strict'
import hub from './hub'
import { DialogChangedEvent } from './events'
class DialogSystem {
constructor () {
this._dialogInstance = null
}
// invoked by the application once the dialog has been created.
notifyDialogInstance (dialog) {
this._dialogInstance = dialog
}
// given a dialog class this will instruct the application to bring up
// the dialog and display it.
showDialog (dialog, options) {
// if the current dialog prevents navigation, then we just silently
// will not show the dialog.
if (!this.preventNavigation()) {
hub.emit(new DialogChangedEvent({
dialog: dialog,
dialogOptions: options || {}
}))
}
}
// tells the application to dismiss the current dialog.
dismissDialog () {
if (!this.preventNavigation()) {
hub.emit(new DialogChangedEvent({
currentDialog: null
}))
}
}
// indicates if a dialog is shown
dialogIsOpen () {
return !!this._dialogInstance
}
// returns true if the current dialog prevents navigation.
preventNavigation () {
return (
this._dialogInstance &&
this._dialogInstance.preventNavigation !== undefined &&
this._dialogInstance.preventNavigation()
)
}
}
const dialogSystem = new DialogSystem()
export default dialogSystem
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