basic functionality

src/components/resource-launcher/LauncherLabelsRow.tsx

@@ -0,0 +1,175 @@
+"use client";
+
+import type { LauncherLabel } from "@server/routers/launcher/types";
+import { LabelBadge } from "@app/components/label-badge";
+import { LabelOverflowBadge } from "@app/components/label-overflow-badge";
+import { cn } from "@app/lib/cn";
+import { useLayoutEffect, useRef, useState } from "react";
+
+const MAX_LABEL_ROWS = 2;
+const SINGLE_ROW_MAX_LABELS = 5;
+
+type LauncherLabelsRowProps = {
+    labels: LauncherLabel[];
+    className?: string;
+    variant?: "wrap" | "single-row";
+};
+
+function countFlexRows(container: HTMLElement): number {
+    const rowTops = new Set<number>();
+
+    for (const child of container.children) {
+        const element = child as HTMLElement;
+        if (element.style.display === "none") {
+            continue;
+        }
+        rowTops.add(element.offsetTop);
+    }
+
+    return rowTops.size;
+}
+
+export function LauncherLabelsRow({
+    labels,
+    className,
+    variant = "wrap"
+}: LauncherLabelsRowProps) {
+    const containerRef = useRef<HTMLDivElement>(null);
+    const measureRef = useRef<HTMLDivElement>(null);
+    const [visibleCount, setVisibleCount] = useState(labels.length);
+
+    const labelKey = labels.map((label) => label.labelId).join(",");
+
+    useLayoutEffect(() => {
+        if (variant === "single-row") {
+            return;
+        }
+
+        const container = containerRef.current;
+        const measure = measureRef.current;
+        if (!container || !measure || labels.length === 0) {
+            return;
+        }
+
+        const recompute = () => {
+            const width = container.clientWidth;
+            if (width <= 0) {
+                setVisibleCount(labels.length);
+                return;
+            }
+
+            measure.style.width = `${width}px`;
+
+            const labelNodes = measure.querySelectorAll<HTMLElement>(
+                "[data-measure-label]"
+            );
+            const overflowNode = measure.querySelector<HTMLElement>(
+                "[data-measure-overflow]"
+            );
+
+            const fits = (visible: number) => {
+                labelNodes.forEach((node, index) => {
+                    node.style.display = index < visible ? "" : "none";
+                });
+
+                if (overflowNode) {
+                    const overflowCount = labels.length - visible;
+                    if (overflowCount > 0) {
+                        overflowNode.style.display = "";
+                    } else {
+                        overflowNode.style.display = "none";
+                    }
+                }
+
+                return countFlexRows(measure) <= MAX_LABEL_ROWS;
+            };
+
+            let best = 0;
+            for (let visible = labels.length; visible >= 0; visible--) {
+                if (fits(visible)) {
+                    best = visible;
+                    break;
+                }
+            }
+
+            setVisibleCount(best);
+        };
+
+        recompute();
+
+        const observer = new ResizeObserver(recompute);
+        observer.observe(container);
+
+        return () => observer.disconnect();
+    }, [labelKey, labels, variant]);
+
+    if (labels.length === 0) {
+        return null;
+    }
+
+    const resolvedVisibleCount =
+        variant === "single-row"
+            ? Math.min(labels.length, SINGLE_ROW_MAX_LABELS)
+            : visibleCount;
+    const visibleLabels = labels.slice(0, resolvedVisibleCount);
+    const overflowLabels = labels.slice(resolvedVisibleCount);
+
+    return (
+        <div
+            ref={containerRef}
+            className={cn("relative min-w-0 w-full", className)}
+        >
+            <div
+                className={cn(
+                    "flex items-center gap-1",
+                    variant === "single-row" ? "flex-nowrap" : "flex-wrap"
+                )}
+            >
+                {visibleLabels.map((label) => (
+                    <LabelBadge
+                        key={label.labelId}
+                        name={label.name}
+                        color={label.color}
+                        displayOnly
+                        className="shrink-0"
+                    />
+                ))}
+                {overflowLabels.length > 0 ? (
+                    <LabelOverflowBadge
+                        labels={overflowLabels.map((label) => ({
+                            color: label.color,
+                            name: label.name
+                        }))}
+                        displayOnly
+                        className="shrink-0"
+                    />
+                ) : null}
+            </div>
+
+            {variant === "wrap" ? (
+                <div
+                    ref={measureRef}
+                    className="pointer-events-none invisible absolute left-0 top-0 flex flex-wrap items-center gap-1"
+                    aria-hidden
+                >
+                    {labels.map((label) => (
+                        <span key={label.labelId} data-measure-label>
+                            <LabelBadge
+                                name={label.name}
+                                color={label.color}
+                                displayOnly
+                                className="shrink-0"
+                            />
+                        </span>
+                    ))}
+                    <span
+                        data-measure-overflow
+                        className="inline-flex shrink-0"
+                    >
+                        <LabelOverflowBadge labels={labels} displayOnly />
+                    </span>
+                </div>
+            ) : null}
+        </div>
+    );
+}