按 API 自定义 Pad / Split

import link.botwmcs.fizzy.ui.element.ElementPainter;
import link.botwmcs.fizzy.ui.frame.FramePainter;
import link.botwmcs.fizzy.ui.pad.PadSpec;
 
import java.util.List;
 
public record LeftSidebarPadSpec(int widthPx, int gapPx, List<ElementPainter> elements) implements PadSpec {
    @Override
    public PadBounds resolve(FramePainter frame, FramePainter.SlotArea slotArea) {
        var layout = frame.layout();
        int h = slotArea != null ? slotArea.h() : layout.h();
        int y = slotArea != null ? slotArea.y() : layout.top();
        int x = layout.left() - Math.max(0, gapPx) - Math.max(0, widthPx);
        return new PadBounds(x, y, Math.max(0, widthPx), Math.max(0, h));
    }
}

import link.botwmcs.fizzy.ui.split.FizzySplitMetrics;
import link.botwmcs.fizzy.ui.split.SplitMetrics;
import link.botwmcs.fizzy.ui.split.SplitPainter;
import link.botwmcs.fizzy.ui.split.SplitType;
import net.minecraft.client.gui.GuiGraphics;
 
public final class DotSplitPainter implements SplitPainter {
    private static final SplitMetrics METRICS = FizzySplitMetrics.ofDefault();
 
    @Override
    public void paint(GuiGraphics g, int x, int y, int lengthPx, SplitType type) {
        if (type == SplitType.VERTICAL) {
            for (int i = 0; i < lengthPx; i += 2) {
                g.fill(x, y + i, x + 1, y + i + 1, 0xFF57D7FF);
            }
        } else {
            for (int i = 0; i < lengthPx; i += 2) {
                g.fill(x + i, y, x + i + 1, y + 1, 0xFF57D7FF);
            }
        }
    }
 
    @Override
    public SplitMetrics metrics() {
        return METRICS;
    }
}

KernelUiSpec uiSpec = KernelUiSpec.builder()
        .addPad(new LeftSidebarPadSpec(
                90,
                8,
                List.of(FizzyComponentElement.singleLine("Sidebar"))
        ))
        .splitPainter(new DotSplitPainter())
        .addSplit(new PixelSplitSpec(0, 0, 120, SplitType.VERTICAL))
        .build();