~sirn/fanboi2

ref: 5b482cfc1bfb0bb1e89715cb57c7bac864391768 fanboi2/assets/app/javascripts/components/topic_quick_reply.ts -rw-r--r-- 4.3 KiB
5b482cfcKridsada Thanabulpong 0.30.0 3 years ago
                                                                                
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import {VNode, create, diff, patch} from 'virtual-dom';

import {DelegationComponent} from './base';
import {TopicInlineReply} from './topic_inline_reply';
import {TopicStateTracker} from './topic_state_tracker';

import {PopoverView} from '../views/popover_view';
import {PostForm} from '../views/post_form';
import {dispatchCustomEvent} from '../utils/elements';


export class TopicQuickReply extends DelegationComponent {
    public targetSelector = '[data-topic-quick-reply]';

    protected bindGlobal(): void {
        document.body.addEventListener('click', (e: Event): void => {
            let $target = e.target;

            if (
                $target instanceof Element &&
                $target.matches(this.targetSelector)
            ) {
                let anchor = $target.getAttribute('data-topic-quick-reply');
                let $topic = $target.closest('[data-topic]');
                let $input: Element;

                e.preventDefault();

                if (!anchor) {
                    throw new Error('Reply anchor is empty when it should not.');
                }

                if ($topic) {
                    $input = $topic.querySelector(
                        '[data-topic-quick-reply-input]'
                    );

                    if ($input instanceof HTMLTextAreaElement) {
                        this.insertTextAtCursor($input, anchor);
                    } else {
                        this.attachForm($target, $topic, anchor);
                    }
                }
            }
        });
    }

    private insertTextAtCursor(
        $input: HTMLTextAreaElement,
        anchor: string
    ): void {
        let anchorText = `>>${anchor} `;
        let startPos = $input.selectionStart;
        let endPos = $input.selectionEnd;
        let currentValue = $input.value;

        $input.value =
            currentValue.substring(0, startPos) +
            anchorText +
            currentValue.substring(endPos, currentValue.length);

        $input.focus();
        $input.dispatchEvent(new Event('change'));
        $input.selectionStart = startPos + anchorText.length;
    }

    private attachForm(
        $target: Element,
        $topic: Element,
        anchor: string
    ): void {
        let $parent = $target.closest('.js-popover');
        let $popover: Element;
        let $textarea: Element;
        let popoverView: PopoverView;
        let popoverNode: VNode;
        let throttleTimer: number;

        if (!$parent) {
            $parent = $topic;
        }

        let _removePopover = () => {
            $topic.removeEventListener('postCreated', _removePopover);
            document.body.removeEventListener('click', _clickRemovePopover);
            window.removeEventListener('resize', _repositionPopover);

            if ($parent) {
              $parent.removeChild($popover);
            }
        }

        popoverView = new PopoverView(
            new PostForm().render(),
            "Quick Reply",
            _removePopover
        );

        let _repositionPopover = () => {
            clearTimeout(throttleTimer);
            throttleTimer = setTimeout(() => {
                if ($popover) {
                    let newPopoverNode = popoverView.render($target);
                    let patches = diff(popoverNode, newPopoverNode);

                    $popover = patch($popover, patches);
                    popoverNode = newPopoverNode;
                }
            }, 100);
        }

        let _clickRemovePopover = (e: Event) => {
            let _n = e.target;

            while (_n instanceof Node && _n != $popover) {
                _n = _n.parentNode;
            }

            if (_n != $popover) {
                _removePopover();
            }
        }

        popoverNode = popoverView.render($target);
        $popover = create(popoverNode);
        $parent.appendChild($popover);

        new TopicInlineReply($popover);
        new TopicStateTracker($popover);

        $textarea = $popover.querySelector('textarea');
        if ($textarea instanceof HTMLTextAreaElement) {
            this.insertTextAtCursor($textarea, anchor);
        }

        document.body.addEventListener('click', _clickRemovePopover);
        $topic.addEventListener('postCreated', _removePopover);
        window.addEventListener('resize', _repositionPopover);
    }
}