forked from mirrors/gecko-dev
124 lines
3.7 KiB
JavaScript
124 lines
3.7 KiB
JavaScript
/*
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* Copyright 2012, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var util = require('../util/util');
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var Menu = require('../ui/menu').Menu;
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var Argument = require('../types/types').Argument;
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var Conversion = require('../types/types').Conversion;
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var Field = require('./fields').Field;
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/**
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* A field that allows selection of one of a number of options
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*/
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function SelectionField(type, options) {
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Field.call(this, type, options);
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this.arg = new Argument();
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this.menu = new Menu({
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document: this.document,
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maxPredictions: Conversion.maxPredictions
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});
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this.element = this.menu.element;
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this.onFieldChange = util.createEvent('SelectionField.onFieldChange');
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// i.e. Register this.onItemClick as the default action for a menu click
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this.menu.onItemClick.add(this.itemClicked, this);
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}
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SelectionField.prototype = Object.create(Field.prototype);
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SelectionField.claim = function(type, context) {
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if (context == null) {
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return Field.NO_MATCH;
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}
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return type.getType(context).hasPredictions ? Field.DEFAULT : Field.NO_MATCH;
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};
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SelectionField.prototype.destroy = function() {
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this.menu.onItemClick.remove(this.itemClicked, this);
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this.menu.destroy();
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this.menu = undefined;
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this.element = undefined;
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Field.prototype.destroy.call(this);
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};
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SelectionField.prototype.setConversion = function(conversion) {
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this.arg = conversion.arg;
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this.setMessage(conversion.message);
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var context = this.requisition.executionContext;
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conversion.getPredictions(context).then(predictions => {
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var items = predictions.map(function(prediction) {
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// If the prediction value is an 'item' (that is an object with a name and
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// description) then use that, otherwise use the prediction itself, because
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// at least that has a name.
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return prediction.value && prediction.value.description ?
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prediction.value :
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prediction;
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}, this);
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if (this.menu != null) {
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this.menu.show(items, conversion.arg.text);
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}
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}).catch(util.errorHandler);
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};
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SelectionField.prototype.itemClicked = function(ev) {
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var arg = new Argument(ev.name, '', ' ');
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var context = this.requisition.executionContext;
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this.type.parse(arg, context).then(conversion => {
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this.onFieldChange({ conversion: conversion });
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this.setMessage(conversion.message);
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}).catch(util.errorHandler);
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};
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SelectionField.prototype.getConversion = function() {
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// This tweaks the prefix/suffix of the argument to fit
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this.arg = this.arg.beget({ text: this.input.value });
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return this.type.parse(this.arg, this.requisition.executionContext);
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};
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/**
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* Allow the terminal to use RETURN to chose the current menu item when
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* it can't execute the command line
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* @return true if an item was 'clicked', false otherwise
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*/
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SelectionField.prototype.selectChoice = function() {
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var selected = this.menu.selected;
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if (selected == null) {
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return false;
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}
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this.itemClicked({ name: selected });
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return true;
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};
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Object.defineProperty(SelectionField.prototype, 'isImportant', {
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get: function() {
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return this.type.name !== 'command';
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},
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enumerable: true
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});
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/**
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* Allow registration and de-registration.
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*/
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exports.items = [ SelectionField ];
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