*/
	getXInset(): number;

	/**
	 * How many pixels from the top, within the <svg> root, the chart sthould be rendered.
	 */
	getYInset(): number;

	getChildrenNodes(): VNode[];
}

export type Chart<S extends ChartState> = Widget<S> & SvgRoot<S> & ChartMixin;

export type ChartFactory = ComposeFactory<Chart<ChartState>, ChartOptions<ChartState>>;

const createChart: ChartFactory = createWidget
	.mixin(createSvgRootMixin)
	.extend({
		getXInset(this: Chart<ChartState>) {
			const { xInset = this.xInset || 0 } = this.state;
			return xInset;
		},

		getYInset(this: Chart<ChartState>) {
			const { xInset = this.yInset || 0 } = this.state;
			return xInset;
		},

		getChildrenNodes(): VNode[] {
			// Subclasses must override.
			return [];
		}

export interface DgridFactory extends ComposeFactory<Dgrid, DgridOptions> { }

const createDgrid: DgridFactory = createWidget
	.mixin({
		mixin: {
			getChildrenNodes(): VNode[] {
				console.log('getChildrenNodes');
				const dgrid: Dgrid = this;

				let domNode = dgrid.state.domNode;
				if (!domNode) {
					console.log('creating domNode');
					const domNode = document.createElement('span');
					domNode.innerHTML = 'Static Content';
					dgrid.setState({
						domNode: domNode
					});
					dgrid.state.vnode = h('div', {
						afterCreate: (domNode) => {
							console.log('afterCreate');
							domNode.appendChild(dgrid.state.domNode);
						}
					});
				}

				return [ dgrid.state.vnode ];
			}
		}
	});

export default createDgrid;

const createCheckboxInput: CheckboxInputFactory = createWidget
	.mixin({
		mixin: createFormFieldMixin,
		aspectAdvice: {
			before: {
				getNodeAttributes(overrides: VNodeProperties = {}) {
					const formfield: FormFieldMixin<any, FormFieldMixinState<any>> & {
						state: any;
					} = this;

					if (formfield.state.checked !== undefined) {
						overrides.checked = formfield.state.checked;
					}

					// this is a hack, it should go into the formfield mixin
					if (formfield.state.placeholder !== undefined) {
						overrides.placeholder = formfield.state.placeholder;
					}

					return [overrides];
				}
			}
		},
		initialize(instance) {
			instance.own(instance.on('input', (event: TypedTargetEvent<HTMLInputElement>) => {
				instance.value = event.target.value;
			}));
		}
	})
	.extend({

const createTodoFilter = createWidget
	.mixin({
		mixin: {
			getChildrenNodes(): VNode[] {
				const todoFilter: TodoFilter = this;
				const filter = todoFilter.state.activeFilter;
				return [
					h('li', {}, [
						h('a', {
							innerHTML: 'All',
							href: '#all',
							classes: {
								selected: filter === 'all'
							}
						})
					]),
					h('li', {}, [
						h('a', {
							innerHTML: 'Active',
							href: '#active',
							classes: {
								selected: filter === 'active'
							}
						})
					]),
					h('li', {}, [
						h('a', {
							innerHTML: 'Completed',
							href: '#completed',
							classes: {
								selected: filter === 'completed'
							}
						})
					])
				];
			}
		}
	})