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/**
* @license
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import '../gr-autocomplete-dropdown/gr-autocomplete-dropdown.js';
import '../gr-cursor-manager/gr-cursor-manager.js';
import '../gr-overlay/gr-overlay.js';
import '@polymer/iron-a11y-keys-behavior/iron-a11y-keys-behavior.js';
import '@polymer/iron-autogrow-textarea/iron-autogrow-textarea.js';
import '../../../styles/shared-styles.js';
import {flush} from '@polymer/polymer/lib/legacy/polymer.dom.js';
import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-textarea_html.js';
import {KeyboardShortcutBehavior} from '../../../behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.js';
import {appContext} from '../../../services/app-context.js';
const MAX_ITEMS_DROPDOWN = 10;
const ALL_SUGGESTIONS = [
{value: '😊', match: 'smile :)'},
{value: '👍', match: 'thumbs up'},
{value: '😄', match: 'laugh :D'},
{value: '🎉', match: 'party'},
{value: '😞', match: 'sad :('},
{value: '😂', match: 'tears :\')'},
{value: '🙏', match: 'pray'},
{value: '😐', match: 'neutral :|'},
{value: '😮', match: 'shock :O'},
{value: '👎', match: 'thumbs down'},
{value: '😎', match: 'cool |;)'},
{value: '😕', match: 'confused'},
{value: '👌', match: 'ok'},
{value: '🔥', match: 'fire'},
{value: '👊', match: 'fistbump'},
{value: '💯', match: '100'},
{value: '💔', match: 'broken heart'},
{value: '🍺', match: 'beer'},
{value: '✔', match: 'check'},
{value: '😋', match: 'tongue'},
{value: '😭', match: 'crying :\'('},
{value: '🐨', match: 'koala'},
{value: '🤓', match: 'glasses'},
{value: '😆', match: 'grin'},
{value: '💩', match: 'poop'},
{value: '😢', match: 'tear'},
{value: '😒', match: 'unamused'},
{value: '😉', match: 'wink ;)'},
{value: '🍷', match: 'wine'},
{value: '😜', match: 'winking tongue ;)'},
];
/**
* @extends PolymerElement
*/
class GrTextarea extends mixinBehaviors( [
KeyboardShortcutBehavior,
], GestureEventListeners(
LegacyElementMixin(
PolymerElement))) {
static get template() { return htmlTemplate; }
static get is() { return 'gr-textarea'; }
/**
* @event bind-value-changed
*/
static get properties() {
return {
autocomplete: Boolean,
disabled: Boolean,
rows: Number,
maxRows: Number,
placeholder: String,
text: {
type: String,
notify: true,
observer: '_handleTextChanged',
},
hideBorder: {
type: Boolean,
value: false,
},
/** Text input should be rendered in monspace font. */
monospace: {
type: Boolean,
value: false,
},
/** Text input should be rendered in code font, which is smaller than the
standard monospace font. */
code: {
type: Boolean,
value: false,
},
/** @type {?number} */
_colonIndex: Number,
_currentSearchString: {
type: String,
observer: '_determineSuggestions',
},
_hideAutocomplete: {
type: Boolean,
value: true,
},
_index: Number,
_suggestions: Array,
// Offset makes dropdown appear below text.
_verticalOffset: {
type: Number,
value: 20,
readOnly: true,
},
};
}
get keyBindings() {
return {
esc: '_handleEscKey',
tab: '_handleEnterByKey',
enter: '_handleEnterByKey',
up: '_handleUpKey',
down: '_handleDownKey',
};
}
constructor() {
super();
this.reporting = appContext.reportingService;
}
/** @override */
ready() {
super.ready();
if (this.monospace) {
this.classList.add('monospace');
}
if (this.code) {
this.classList.add('code');
}
if (this.hideBorder) {
this.$.textarea.classList.add('noBorder');
}
}
closeDropdown() {
return this.$.emojiSuggestions.close();
}
getNativeTextarea() {
return this.$.textarea.textarea;
}
putCursorAtEnd() {
const textarea = this.getNativeTextarea();
// Put the cursor at the end always.
textarea.selectionStart = textarea.value.length;
textarea.selectionEnd = textarea.selectionStart;
this.async(() => {
textarea.focus();
});
}
_handleEscKey(e) {
if (this._hideAutocomplete) { return; }
e.preventDefault();
e.stopPropagation();
this._resetEmojiDropdown();
}
_handleUpKey(e) {
if (this._hideAutocomplete) { return; }
e.preventDefault();
e.stopPropagation();
this.$.emojiSuggestions.cursorUp();
this.$.textarea.textarea.focus();
this.disableEnterKeyForSelectingEmoji = false;
}
_handleDownKey(e) {
if (this._hideAutocomplete) { return; }
e.preventDefault();
e.stopPropagation();
this.$.emojiSuggestions.cursorDown();
this.$.textarea.textarea.focus();
this.disableEnterKeyForSelectingEmoji = false;
}
_handleEnterByKey(e) {
if (this._hideAutocomplete || this.disableEnterKeyForSelectingEmoji) {
return;
}
e.preventDefault();
e.stopPropagation();
this._setEmoji(this.$.emojiSuggestions.getCurrentText());
}
_handleEmojiSelect(e) {
this._setEmoji(e.detail.selected.dataset.value);
}
_setEmoji(text) {
const colonIndex = this._colonIndex;
this.text = this._getText(text);
this.$.textarea.selectionStart = colonIndex + 1;
this.$.textarea.selectionEnd = colonIndex + 1;
this.reporting.reportInteraction('select-emoji', {type: text});
this._resetEmojiDropdown();
}
_getText(value) {
return this.text.substr(0, this._colonIndex || 0) +
value + this.text.substr(this.$.textarea.selectionStart);
}
/**
* Uses a hidden element with the same width and styling of the textarea and
* the text up until the point of interest. Then caratSpan element is added
* to the end and is set to be the positionTarget for the dropdown. Together
* this allows the dropdown to appear near where the user is typing.
*/
_updateCaratPosition() {
this._hideAutocomplete = false;
this.$.hiddenText.textContent = this.$.textarea.value.substr(0,
this.$.textarea.selectionStart);
const caratSpan = this.$.caratSpan;
this.$.hiddenText.appendChild(caratSpan);
this.$.emojiSuggestions.positionTarget = caratSpan;
this._openEmojiDropdown();
}
_getFontSize() {
const fontSizePx = getComputedStyle(this).fontSize || '12px';
return parseInt(fontSizePx.substr(0, fontSizePx.length - 2),
10);
}
_getScrollTop() {
return document.body.scrollTop;
}
/**
* _handleKeydown used for key handling in the this.$.textarea AND all child
* autocomplete options.
*/
_onValueChanged(e) {
// Relay the event.
this.dispatchEvent(new CustomEvent('bind-value-changed', {
detail: e,
composed: true, bubbles: true,
}));
// If cursor is not in textarea (just opened with colon as last char),
// Don't do anything.
if (!e.currentTarget.focused) { return; }
const charAtCursor = e.detail && e.detail.value ?
e.detail.value[this.$.textarea.selectionStart - 1] : '';
if (charAtCursor !== ':' && this._colonIndex == null) { return; }
// When a colon is detected, set a colon index. We are interested only on
// colons after space or in beginning of textarea
if (charAtCursor === ':') {
if (this.$.textarea.selectionStart < 2 ||
e.detail.value[this.$.textarea.selectionStart - 2] === ' ') {
this._colonIndex = this.$.textarea.selectionStart - 1;
}
}
this._currentSearchString = e.detail.value.substr(this._colonIndex + 1,
this.$.textarea.selectionStart - this._colonIndex - 1);
// Under the following conditions, close and reset the dropdown:
// - The cursor is no longer at the end of the current search string
// - The search string is an space or new line
// - The colon has been removed
// - There are no suggestions that match the search string
if (this.$.textarea.selectionStart !==
this._currentSearchString.length + this._colonIndex + 1 ||
this._currentSearchString === ' ' ||
this._currentSearchString === '\n' ||
!(e.detail.value[this._colonIndex] === ':') ||
!this._suggestions.length) {
this._resetEmojiDropdown();
// Otherwise open the dropdown and set the position to be just below the
// cursor.
} else if (this.$.emojiSuggestions.isHidden) {
this._updateCaratPosition();
}
this.$.textarea.textarea.focus();
}
_openEmojiDropdown() {
this.$.emojiSuggestions.open();
this.reporting.reportInteraction('open-emoji-dropdown');
}
_formatSuggestions(matchedSuggestions) {
const suggestions = [];
for (const suggestion of matchedSuggestions) {
suggestion.dataValue = suggestion.value;
suggestion.text = suggestion.value + ' ' + suggestion.match;
suggestions.push(suggestion);
}
this.set('_suggestions', suggestions);
}
_determineSuggestions(emojiText) {
if (!emojiText.length) {
this._formatSuggestions(ALL_SUGGESTIONS);
this.disableEnterKeyForSelectingEmoji = true;
} else {
const matches = ALL_SUGGESTIONS
.filter(suggestion => suggestion.match.includes(emojiText))
.slice(0, MAX_ITEMS_DROPDOWN);
this._formatSuggestions(matches);
this.disableEnterKeyForSelectingEmoji = false;
}
}
_resetEmojiDropdown() {
// hide and reset the autocomplete dropdown.
flush();
this._currentSearchString = '';
this._hideAutocomplete = true;
this.closeDropdown();
this._colonIndex = null;
this.$.textarea.textarea.focus();
}
_handleTextChanged(text) {
this.dispatchEvent(
new CustomEvent('value-changed', {detail: {value: text}}));
}
}
customElements.define(GrTextarea.is, GrTextarea);