GuideContainerWidget.java

public abstract class GuideContainerWidget extends GuideWidget implements LayoutContainer
{
	private final Map<GuideWidget, LayoutElementMetrics> elementMetrics = new HashMap<>();
	private final LayoutContainerMetrics metrics = new LayoutContainerMetrics();

	@Override
	public Iterable<? extends GuideWidget> getLayoutChildren()
	{
		return elementMetrics.keySet();
	}

	protected void add(GuideWidget element, int x, int y)
	{
		elementMetrics.put(element, new LayoutElementMetrics(x, y));
	}

	protected void add(GuideWidget element, int x, int y, Consumer<LayoutElementMetrics> metricsConfig)
	{
		LayoutElementMetrics metrics = new LayoutElementMetrics(x, y);
		metricsConfig.accept(metrics);
		elementMetrics.put(element, metrics);
	}

	@Override
	public LayoutElementMetrics getLayoutElementMetrics(LayoutElement element)
	{
		return elementMetrics.get(element);
	}

	@Override
	public LayoutContainerMetrics getLayoutContainerMetrics()
	{
		return metrics;
	}

	@Override
	public void setLayoutValues(LayoutElement element, int x, int y, int width, int height)
	{
		if (element instanceof Widget)
			((Widget) element).setOwnLayoutValues(x, y, width, height);
	}

	@Override
	public void render(int mouseX, int mouseY, float lastFrameDuration)
	{
		for (GuideWidget element : getLayoutChildren())
		{
			element.render(mouseX, mouseY, lastFrameDuration);
		}
	}
}

GuideWidget.java

public abstract class GuideWidget extends Widget implements GuideGuiElement
{

}

LabelWidget.java

public class LabelWidget extends GuideWidget
{
	private final String text;

	public LabelWidget(String text)
	{
		this.text = text;
	}

	@Override
	public void setOwnLayoutValues(int x, int y, int width, int height)
	{
		height = Math.max(height, MinecraftClient.getInstance().textRenderer.fontHeight);
		System.out.printf("x: %d, y: %d, width: %d, height: %d\n", x, y, width, height);
		super.setOwnLayoutValues(x, y, width, height);
	}

	@Override
	public void render(int mouseX, int mouseY, float lastFrameDuration)
	{
		GlStateManager.disableTexture();
		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferBuilder = tessellator.getBufferBuilder();
		bufferBuilder.begin(GL11.GL_LINE_LOOP, VertexFormats.POSITION_COLOR);
		bufferBuilder.vertex(x, y, 0).color(1.0F, 0.5F, 0.0F, 1.0F).next();
		bufferBuilder.vertex(x + width, y, 0).color(1.0F, 0.5F, 0.0F, 1.0F).next();
		bufferBuilder.vertex(x + width, y + height, 0).color(1.0F, 0.5F, 0.0F, 1.0F).next();
		bufferBuilder.vertex(x, y + height, 0).color(1.0F, 0.5F, 0.0F, 1.0F).next();
		tessellator.draw();
		GlStateManager.enableTexture();
		MinecraftClient.getInstance().textRenderer.draw(text, x, y, 0x000000);
	}
}

ListWidget.java

public class ListWidget extends GuideContainerWidget
{
	private final List<GuideWidget> elements = new ArrayList<>();

	@Override
	public void render(int mouseX, int mouseY, float lastFrameDuration)
	{
		for (GuideWidget element : elements)
		{
			element.render(mouseX, mouseY, lastFrameDuration);
		}
	}

	public void add(GuideWidget element)
	{
		elements.add(element);
		add(element, 0, elements.size() - 1);
	}

	public void add(GuideWidget element, Consumer<LayoutElementMetrics> metricsConfig)
	{
		elements.add(element);
		add(element, 0, elements.size() - 1, metricsConfig);
	}

	@Override
	public Iterable<? extends GuideWidget> getLayoutChildren()
	{
		return elements;
	}

	@Override
	public void setLayoutValues(LayoutElement element, int x, int y, int width, int height)
	{
		if (element instanceof Widget)
			((Widget) element).setOwnLayoutValues(x, y, width, height);
	}
}

TableOfContentsEntries.java

public class TableOfContentsEntries extends GuideContainerWidget implements VisibleContent
{
	private final ListWidget links;

	public TableOfContentsEntries(TableOfContents toc, int x, int y, int width, int height)
	{
		this.links = new ListWidget();
		setOwnLayoutValues(x, y, width, height);
		this.getLayoutContainerMetrics().setCellPadding(14);
		for (Link link : toc.getLinks())
		{
			links.add(new LabelWidget(link.name), metrics ->
			{
				metrics.verticalGrowType = GrowType.PACK;
			});
		}
		add(links, 0, 0);
		System.out.printf("x: %d y: %d w: %d h: %d\n", x, y, width, height);
		Layout.layout(this, x, y, width, height, false);
	}

	@Override
	public void render(int mouseX, int mouseY, float lastFrameDuration)
	{
		for (LayoutElement child : getLayoutChildren())
		{
			if (child instanceof RenderableElement)
				((RenderableElement) child).render(mouseX, mouseY, lastFrameDuration);
		}
	}
}