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| import Ember from 'ember';
import layout from '../templates/components/select-dropdown';
import { buildTree } from '../utils/tree';
import { bringInView } from '../utils/view';
const {
Component,
computed,
get,
observer,
isEmpty,
isNone,
isPresent,
run,
on
} = Ember;
export default Component.extend({
layout,
list: null,
classNames: ['es-options'],
modelChanged: on('init', observer('model', function() {
let options = this.getProperties('valueKey', 'labelKey');
let model = this.get('model');
let list = buildTree(model, options);
this.setProperties({ list });
})),
keyPressed: observer('keyEvent', function() {
this.keys.call(this, this.get('keyEvent'));
}),
options: computed('token', 'model.[]', 'values.[]', 'shouldFilter', function() {
if (this.get('shouldFilter')) {
this.filterModel();
}
return this.get('list');
}),
actions: {
hover(node) {
let selected = this.get('selected');
if (selected) {
selected.set('isSelected', false);
}
this.set('selected', node);
node.set('isSelected', true);
},
select(node) {
this.attrs.select(node.content, true);
}
},
/* Filter out existing selections. Mark everything
visible if no search, otherwise update visiblity. */
filterModel() {
let list = this.get('list');
let token = this.get('token');
let values = this.get('values');
list.forEach(el => el.set('isVisible', false));
if (isPresent(values)) {
list = list.filter(el => values.indexOf(el.content) === -1);
}
if (isEmpty(token)) {
list.forEach(el => el.set('isVisible', true));
} else {
token = token.toLowerCase();
this.setVisibility(list, token);
}
// Mark first visible element as selected
if (!this.get('freeText') && isPresent(token) && list.some(x => get(x, 'isVisible'))) {
let [firstVisible] = list.filter(x => get(x, 'isVisible'));
firstVisible.set('isSelected', true);
this.set('selected', firstVisible);
}
},
keys(keyEvent) {
if (!keyEvent || !keyEvent.which) {
return;
}
let selected = this.get('selected');
switch (keyEvent.which) {
case 9: // TAB
case 13: // Enter
this.tabEnterKeys(selected);
break;
case 38: // Up
case 40: // Down
this.upDownKeys(selected, keyEvent);
break;
}
},
// Prevent mousedown event from stealing focus from input
mouseDown(event) {
event.preventDefault();
},
// Down: 40, Up: 38
move(list, selected, direction) {
if (isPresent(selected)) {
selected.set('isSelected', false);
}
if (isEmpty(list)) {
return;
}
let index = selected ? list.findIndex(node => selected.id === node.id) : -1;
let node;
if (direction === 38) {
if (index !== -1) {
node = list[index - 1];
}
if (isNone(node)) {
node = list[list.length - 1];
}
} else {
if (index !== -1) {
node = list[index + 1];
}
if (isNone(node)) {
node = list[0];
}
}
this.set('selected', node);
node.set('isSelected', true);
run.next(this, bringInView, '.es-options', '.es-highlight');
},
setVisibility(list, token) {
list
.filter(el => get(el, 'name').toLowerCase().indexOf(token) > -1)
.forEach(el => el.set('isVisible', true));
},
tabEnterKeys(selected) {
if (selected && this.get('list').includes(selected)) {
this.send('select', selected);
} else if (this.get('freeText')) {
this.attrs.select(this.get('token'));
}
},
upDownKeys(selected, keyEvent) {
let list = this.get('list').filterBy('isVisible');
this.move(list, selected, keyEvent.which);
}
});
|