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/**
* @license
* Copyright (C) 2016 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 '@polymer/paper-input/paper-input';
import '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
import '../gr-cursor-manager/gr-cursor-manager';
import '../gr-icons/gr-icons';
import '../../../styles/shared-styles';
import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
import {PolymerElement} from '@polymer/polymer/polymer-element';
import {htmlTemplate} from './gr-autocomplete_html';
import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
import {property, customElement, observe} from '@polymer/decorators';
import {GrAutocompleteDropdown} from '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
import {GrCursorManager} from '../gr-cursor-manager/gr-cursor-manager';
import {PaperInputElementExt} from '../../../types/types';
import {CustomKeyboardEvent} from '../../../types/events';
import {fireEvent} from '../../../utils/event-util';
const TOKENIZE_REGEX = /(?:[^\s"]+|"[^"]*")+/g;
const DEBOUNCE_WAIT_MS = 200;
export interface GrAutocomplete {
$: {
input: PaperInputElementExt;
suggestions: GrAutocompleteDropdown;
cursor: GrCursorManager;
};
}
export type AutocompleteQuery = (
text: string
) => Promise<AutocompleteSuggestion[]>;
declare global {
interface HTMLElementTagNameMap {
'gr-autocomplete': GrAutocomplete;
}
}
export interface AutocompleteSuggestion {
name?: string;
label?: string;
value?: string;
text?: string;
}
export interface AutocompleteCommitEventDetail {
value: string;
}
export type AutocompleteCommitEvent = CustomEvent<
AutocompleteCommitEventDetail
>;
@customElement('gr-autocomplete')
export class GrAutocomplete extends KeyboardShortcutMixin(
GestureEventListeners(LegacyElementMixin(PolymerElement))
) {
static get template() {
return htmlTemplate;
}
/**
* Fired when a value is chosen.
*
* @event commit
*/
/**
* Fired when the user cancels.
*
* @event cancel
*/
/**
* Fired on keydown to allow for custom hooks into autocomplete textbox
* behavior.
*
* @event input-keydown
*/
/**
* Query for requesting autocomplete suggestions. The function should
* accept the input as a string parameter and return a promise. The
* promise yields an array of suggestion objects with "name", "label",
* "value" properties. The "name" property will be displayed in the
* suggestion entry. The "label" property will, when specified, appear
* next to the "name" as label text. The "value" property will be emitted
* if that suggestion is selected.
*
*/
@property({type: Object})
query: AutocompleteQuery = () => Promise.resolve([]);
/**
* The number of characters that must be typed before suggestions are
* made. If threshold is zero, default suggestions are enabled.
*/
@property({type: Number})
threshold = 1;
@property({type: Boolean})
allowNonSuggestedValues = false;
@property({type: Boolean})
borderless = false;
@property({type: Boolean})
disabled = false;
@property({type: Boolean})
showSearchIcon = false;
/**
* Vertical offset needed for an element with 20px line-height, 4px
* padding and 1px border (30px height total). Plus 1px spacing between
* input and dropdown. Inputs with different line-height or padding will
* need to tweak vertical offset.
*/
@property({type: Number})
verticalOffset = 31;
@property({type: String, notify: true})
text = '';
@property({type: String})
placeholder = '';
@property({type: Boolean})
clearOnCommit = false;
/**
* When true, tab key autocompletes but does not fire the commit event.
* When false, tab key not caught, and focus is removed from the element.
* See Issue 4556, Issue 6645.
*/
@property({type: Boolean})
tabComplete = false;
@property({type: String, notify: true})
value = '';
/**
* Multi mode appends autocompleted entries to the value.
* If false, autocompleted entries replace value.
*/
@property({type: Boolean})
multi = false;
/**
* When true and uncommitted text is left in the autocomplete input after
* blurring, the text will appear red.
*/
@property({type: Boolean})
warnUncommitted = false;
/**
* When true, querying for suggestions is not debounced w/r/t keypresses
*/
@property({type: Boolean})
noDebounce = false;
@property({type: Array})
_suggestions: AutocompleteSuggestion[] = [];
@property({type: Array})
_suggestionEls = [];
@property({type: Number})
_index?: number;
@property({type: Boolean})
_disableSuggestions = false;
@property({type: Boolean})
_focused = false;
/**
* Invisible label for input element. This label is exposed to
* screen readers by paper-input
*/
@property({type: String})
label = '';
/** The DOM element of the selected suggestion. */
@property({type: Object})
_selected: HTMLElement | null = null;
get _nativeInput() {
// In Polymer 2 inputElement isn't nativeInput anymore
return (this.$.input.$.nativeInput ||
this.$.input.inputElement) as HTMLInputElement;
}
/** @override */
attached() {
super.attached();
this.listen(document.body, 'click', '_handleBodyClick');
}
/** @override */
detached() {
super.detached();
this.unlisten(document.body, 'click', '_handleBodyClick');
this.cancelDebouncer('update-suggestions');
}
get focusStart() {
return this.$.input;
}
focus() {
this._nativeInput.focus();
}
selectAll() {
const nativeInputElement = this._nativeInput;
if (!this.$.input.value) {
return;
}
nativeInputElement.setSelectionRange(0, this.$.input.value.length);
}
clear() {
this.text = '';
}
_handleItemSelect(e: CustomEvent) {
// Let _handleKeydown deal with keyboard interaction.
if (e.detail.trigger !== 'click') {
return;
}
this._selected = e.detail.selected;
this._commit();
}
get _inputElement() {
// Polymer2: this.$ can be undefined when this is first evaluated.
return this.$ && this.$.input;
}
/**
* Set the text of the input without triggering the suggestion dropdown.
*
* @param text The new text for the input.
*/
setText(text: string) {
this._disableSuggestions = true;
this.text = text;
this._disableSuggestions = false;
}
_onInputFocus() {
this._focused = true;
this._updateSuggestions(this.text, this.threshold, this.noDebounce);
this.$.input.classList.remove('warnUncommitted');
// Needed so that --paper-input-container-input updated style is applied.
this.updateStyles();
}
_onInputBlur() {
this.$.input.classList.toggle(
'warnUncommitted',
this.warnUncommitted && !!this.text.length && !this._focused
);
// Needed so that --paper-input-container-input updated style is applied.
this.updateStyles();
}
@observe('text', 'threshold', 'noDebounce')
_updateSuggestions(text?: string, threshold?: number, noDebounce?: boolean) {
if (
text === undefined ||
threshold === undefined ||
noDebounce === undefined
)
return;
// Reset _suggestions for every update
// This will also prevent from carrying over suggestions:
// @see Issue 12039
this._suggestions = [];
// TODO(taoalpha): Also skip if text has not changed
if (this._disableSuggestions) {
return;
}
if (text.length < threshold) {
this.value = '';
return;
}
if (!this._focused) {
return;
}
const update = () => {
this.query(text).then(suggestions => {
if (text !== this.text) {
// Late response.
return;
}
for (const suggestion of suggestions) {
suggestion.text = suggestion.name;
}
this._suggestions = suggestions;
flush();
if (this._index === -1) {
this.value = '';
}
});
};
if (noDebounce) {
update();
} else {
this.debounce('update-suggestions', update, DEBOUNCE_WAIT_MS);
}
}
@observe('_suggestions', '_focused')
_maybeOpenDropdown(suggestions: AutocompleteSuggestion[], focused: boolean) {
if (suggestions.length > 0 && focused) {
return this.$.suggestions.open();
}
return this.$.suggestions.close();
}
_computeClass(borderless: boolean) {
return borderless ? 'borderless' : '';
}
/**
* _handleKeydown used for key handling in the this.$.input AND all child
* autocomplete options.
*/
_handleKeydown(e: CustomKeyboardEvent) {
this._focused = true;
switch (e.keyCode) {
case 38: // Up
e.preventDefault();
this.$.suggestions.cursorUp();
break;
case 40: // Down
e.preventDefault();
this.$.suggestions.cursorDown();
break;
case 27: // Escape
e.preventDefault();
this._cancel();
break;
case 9: // Tab
if (this._suggestions.length > 0 && this.tabComplete) {
e.preventDefault();
this._handleInputCommit(true);
this.focus();
} else {
this._focused = false;
}
break;
case 13: // Enter
if (this.modifierPressed(e)) {
break;
}
e.preventDefault();
this._handleInputCommit();
break;
default:
// For any normal keypress, return focus to the input to allow for
// unbroken user input.
this.focus();
// Since this has been a normal keypress, the suggestions will have
// been based on a previous input. Clear them. This prevents an
// outdated suggestion from being used if the input keystroke is
// immediately followed by a commit keystroke. @see Issue 8655
this._suggestions = [];
}
this.dispatchEvent(
new CustomEvent('input-keydown', {
detail: {keyCode: e.keyCode, input: this.$.input},
composed: true,
bubbles: true,
})
);
}
_cancel() {
if (this._suggestions.length) {
this.set('_suggestions', []);
} else {
fireEvent(this, 'cancel');
}
}
_handleInputCommit(_tabComplete?: boolean) {
// Nothing to do if the dropdown is not open.
if (!this.allowNonSuggestedValues && this.$.suggestions.isHidden) {
return;
}
this._selected = this.$.suggestions.getCursorTarget();
this._commit(_tabComplete);
}
_updateValue(
suggestion: HTMLElement | null,
suggestions: AutocompleteSuggestion[]
) {
if (!suggestion) {
return;
}
const index = Number(suggestion.dataset['index']!);
if (isNaN(index)) return;
const completed = suggestions[index].value;
if (completed === undefined || completed === null) return;
if (this.multi) {
// Append the completed text to the end of the string.
// Allow spaces within quoted terms.
const tokens = this.text.match(TOKENIZE_REGEX);
if (tokens?.length) {
tokens[tokens.length - 1] = completed;
this.value = tokens.join(' ');
}
} else {
this.value = completed;
}
}
_handleBodyClick(e: Event) {
const eventPath = e.composedPath();
if (!eventPath) return;
for (let i = 0; i < eventPath.length; i++) {
if (eventPath[i] === this) {
return;
}
}
this._focused = false;
}
/**
* Commits the suggestion, optionally firing the commit event.
*
* @param silent Allows for silent committing of an
* autocomplete suggestion in order to handle cases like tab-to-complete
* without firing the commit event.
*/
_commit(silent?: boolean) {
// Allow values that are not in suggestion list iff suggestions are empty.
if (this._suggestions.length > 0) {
this._updateValue(this._selected, this._suggestions);
} else {
this.value = this.text || '';
}
const value = this.value;
// Value and text are mirrors of each other in multi mode.
if (this.multi) {
this.setText(this.value);
} else {
if (!this.clearOnCommit && this._selected) {
const dataSet = this._selected.dataset;
// index property cannot be null for the data-set
if (dataSet) {
const index = Number(dataSet['index']!);
if (isNaN(index)) return;
this.setText(this._suggestions[index].name || '');
}
} else {
this.clear();
}
}
this._suggestions = [];
if (!silent) {
this.dispatchEvent(
new CustomEvent('commit', {
detail: {value} as AutocompleteCommitEventDetail,
composed: true,
bubbles: true,
})
);
}
}
_computeShowSearchIconClass(showSearchIcon: boolean) {
return showSearchIcon ? 'showSearchIcon' : '';
}
}