Class OutputHandler

webiojs/src/handlers/output.ts:28–197

}

export class OutputHandler implements CommandHandler {
    session: Session;

    accept_command = ['output', 'output_ctl'];

    private readonly container_parent: JQuery;
    private readonly container_elem: JQuery;

    constructor(session: Session, container_elem: JQuery) {
        this.session = session;
        this.container_elem = container_elem;
        this.container_parent = this.container_elem.parent();
    }

    scroll_bottom() {
        body_scroll_to($('.pywebio'), 'bottom', null, 15);
    };

    is_elem_visible(elem: JQuery) {
        try {
            return DISPLAY_NONE_TAGS.indexOf(elem[0].tagName.toLowerCase()) == -1;
        } catch (e) {
        }
        return false;
    }

    handle_message(msg: Command) {
        let output_to_root = false;
        if (msg.command === 'output') {
            let elem;
            try {
                elem = getWidgetElement(msg.spec);
            } catch (e) {
                return console.error(`Handle command error: "${e}"\nCommand:\n${JSON.stringify(msg)}`);
            }

            let container_elem = $(msg.spec.scope);

            if (config.outputAnimation && this.is_elem_visible(elem) && container_elem.length == 1) elem.hide();

            if (container_elem.length === 0)
                return console.error(`Scope '${msg.spec.scope}' not found`);

            if (!msg.spec.scope || msg.spec.scope === '#pywebio-scope-ROOT') output_to_root = true;

            if (msg.spec.position === 0)
                container_elem.prepend(elem);
            else if (msg.spec.position === -1)
                container_elem.append(elem);
            else {
                for (let con of container_elem) {
                    let pos = $(con.children).eq(msg.spec.position);
                    if (msg.spec.position >= 0)
                        elem.insertBefore(pos);
                    else
                        elem.insertAfter(pos);
                }
            }