Support post-render callback for all UI components

[wiredearp]

If you are injecting custom HTML (such as images) into a UI component (for a demo or a prototype), you are bound to be disappointed when the HTML disappears after an EDBML update.

@vvvts is currently using this technique to simulate a proposed feature in the Table.

To support this kind of hacking, all components should hook into onrender and call a user defined method for this kind of post-render processing. We'll just need to come up with a good name, now that onrender is used by the component internally.

[wiredearp]

Note to self: Also expose onflex with some kind of LifePlugin event.

[sheepray]

thumbs up for onrender callback to make unit test more handy. One example how we do currently.

const handler = {
    onlife: () => {
        if (table.rows().length === 1) {
            expect(table.pager().page).toBe(1);
            expect(table.pager().pages).toBe(4);
            table.life.remove('gui-life-render', handler);
        }
    }
};

table.life.add('gui-life-render', handler);

[DocGroth]

Categorised as Spiritual Issues