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import {
AcceptedInputType,
ActiveTrigger,
DropdownPosition,
Item,
Trigger,
} from './types';
import {
getActiveTrigger,
getInputSelectionStart,
searchItems,
setInputValue,
} from './util/input';
import { getDropdownPosition } from './util/dropdown';
import { DROPDOWN_HEIGHT, MAX_SEARCH_LENGTH, SELECT_KEYS } from './constants';
export function useSmartSuggest(
startTriggers?: Trigger[],
startInput?: AcceptedInputType
) {
/**
* The textarea that is currently active
*/
let input: AcceptedInputType | undefined = startInput;
/**
* Current triggers definition
*/
const triggers = ref<Trigger[]>(startTriggers ?? []);
/**
* Whether the suggestions should be shown
*/
const active = ref(false);
/**
* Current active trigger
*/
const activeTrigger = ref<ActiveTrigger>();
/**
* Current list of suggestions
*/
const items = ref<Item[]>([]);
/**
* Current active suggestion
*/
const activeIndex = ref(0);
/**
* Current dropdown position
*/
const dropdownPosition = ref<DropdownPosition>({
toTop: false,
top: 0,
left: 0,
width: 0,
height: 0,
});
/**
* Update the current text area element
* @param newInput The new text area element
*/
function setInputElement(newInput?: AcceptedInputType) {
if (newInput === input) {
return;
}
if (input) {
input.removeEventListener('blur', onBlur);
input.removeEventListener('scroll', onScroll);
input.removeEventListener('input', onInput);
input.removeEventListener('keydown', onKeyDown);
}
input = newInput;
if (newInput) {
newInput.addEventListener('blur', onBlur);
newInput.addEventListener('scroll', onScroll);
newInput.addEventListener('input', onInput);
newInput.addEventListener('keydown', onKeyDown);
}
}
const onBlur = () => (active.value = false);
const onScroll = () =>
input &&
(dropdownPosition.value = getDropdownPosition(input, DROPDOWN_HEIGHT));
/**
* When the text area is updated
*/
function onInput() {
if (!input) {
return;
}
activeIndex.value = 0;
const newActiveTrigger = getActiveTrigger(
input,
triggers.value,
MAX_SEARCH_LENGTH
);
// Get list of items matching the search
items.value = newActiveTrigger
? searchItems(newActiveTrigger.trigger, newActiveTrigger.search)
: [];
// No active trigger or no result, hide dropdown
if (
!newActiveTrigger ||
(!newActiveTrigger.trigger.showNoResult && items.value.length === 0)
) {
active.value = false;
return;
}
// Update dropdown data
dropdownPosition.value = getDropdownPosition(input, DROPDOWN_HEIGHT);
activeTrigger.value = newActiveTrigger;
active.value = true;
}
/**
* Listen for special keys (selection, navigation within items)
*/
function onKeyDown(event: KeyboardEvent) {
if (!input || !active.value) {
return;
}
// Handle up/down keys
if (event.key === 'ArrowUp') {
event.preventDefault();
event.stopPropagation();
activeIndex.value =
(activeIndex.value - 1 + items.value.length) %
items.value.length;
return;
} else if (event.key === 'ArrowDown') {
event.preventDefault();
event.stopPropagation();
activeIndex.value = (activeIndex.value + 1) % items.value.length;
return;
}
// Handle force-close key
if (event.key === 'Escape') {
event.preventDefault();
event.stopPropagation();
active.value = false;
return;
}
// Handle selection key
if (SELECT_KEYS.includes(event.key)) {
event.preventDefault();
event.stopPropagation();
const activeItem = items.value[activeIndex.value];
if (activeItem) {
select(activeItem);
}
return;
}
}
/**
* Add a given item to the input and close the dropdown
*
* @param item Item to add
*/
function select(item: Item) {
if (input && activeTrigger.value) {
const newValue =
input.value.substring(0, activeTrigger.value.index) +
item.value +
(activeTrigger.value.trigger.insertSpaceAfter !== false
? ' '
: '') +
input.value.substring(getInputSelectionStart(input));
setInputValue(input, newValue);
active.value = false;
}
}
/**
* In case the list of triggers is updated
*/
function setTriggers(newTriggers: Trigger[]) {
triggers.value = newTriggers;
}
return {
setInputElement,
setTriggers,
select,
active,
items,
dropdownPosition,
activeIndex,
activeTrigger,
};
}
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