zulip/static/js/widgetize.js

const widgets = new Map([
    ["poll", poll_widget],
    ["tictactoe", tictactoe_widget],
    ["todo", todo_widget],
    ["zform", zform],
]);

const widget_contents = new Map();
exports.widget_contents = widget_contents;

function set_widget_in_message(row, widget_elem) {
    const content_holder = row.find(".message_content");
    content_holder.empty().append(widget_elem);
}

exports.activate = function (in_opts) {
    const widget_type = in_opts.widget_type;
    const extra_data = in_opts.extra_data;
    const events = in_opts.events;
    const row = in_opts.row;
    const message = in_opts.message;
    const post_to_server = in_opts.post_to_server;

    events.shift();

    if (!widgets.has(widget_type)) {
        blueslip.warn("unknown widget_type", widget_type);
        return;
    }

    const callback = function (data) {
        post_to_server({
            msg_type: "widget",
            data,
        });
    };

    if (row.attr("id").startsWith("zhome") && narrow_state.active()) {
        // Don't place widget in a home message row if we are narrowed
        // to active state
        return;
    }

    let widget_elem = widget_contents.get(message.id);
    if (widget_elem) {
        set_widget_in_message(row, widget_elem);
        return;
    }

    // We depend on our widgets to use templates to build
    // the HTML that will eventually go in this div.
    widget_elem = $("<div>").addClass("widget-content");

    widgets.get(widget_type).activate({
        elem: widget_elem,
        callback,
        message,
        extra_data,
    });

    widget_contents.set(message.id, widget_elem);
    set_widget_in_message(row, widget_elem);

    // Replay any events that already happened.  (This is common
    // when you narrow to a message after other users have already
    // interacted with it.)
    if (events.length > 0) {
        widget_elem.handle_events(events);
    }
};

exports.set_widgets_for_list = function () {
    for (const [idx, widget_elem] of widget_contents) {
        if (current_msg_list.get(idx) !== undefined) {
            const row = current_msg_list.get_row(idx);
            set_widget_in_message(row, widget_elem);
        }
    }
};

exports.handle_event = function (widget_event) {
    const widget_elem = widget_contents.get(widget_event.message_id);

    if (!widget_elem) {
        // It is common for submessage events to arrive on
        // messages that we don't yet have in view. We
        // just ignore them completely here.
        return;
    }

    const events = [widget_event];

    widget_elem.handle_events(events);
};

window.widgetize = exports;