feat: implement skin management

src/lib/components/ui/scroll-container/ScrollContainer.svelte

@@ -0,0 +1,143 @@
+<script lang="ts">
+  // Props
+  let { children, class: className = '', topOffset = 0 } = $props();
+
+  let wrapper: HTMLDivElement;
+  let container: HTMLDivElement;
+  let thumb: HTMLDivElement;
+
+  // Thumb state
+  let thumbHeight = $state(20);
+  let thumbTop = $state(0);
+
+  // Drag state
+  let dragging = false;
+  let startY = 0;
+  let startScroll = 0;
+
+  /** Update thumb height & position */
+  function updateScrollbar() {
+    if (!container) return;
+
+    const { scrollTop, scrollHeight, clientHeight } = container;
+    const scrollable = scrollHeight - clientHeight;
+
+    if (scrollable <= 0) {
+      thumbHeight = 0;
+      thumbTop = 0;
+      return;
+    }
+
+    thumbHeight = Math.max((clientHeight / scrollHeight) * clientHeight, 24);
+
+    const trackHeight = clientHeight - thumbHeight - topOffset;
+    thumbTop = (scrollTop / scrollable) * trackHeight;
+  }
+
+  /** Start dragging the thumb */
+  function startDrag(e: PointerEvent) {
+    dragging = true;
+    startY = e.clientY;
+    startScroll = container.scrollTop;
+    thumb.setPointerCapture(e.pointerId);
+  }
+
+  /** Drag the thumb */
+  function drag(e: PointerEvent) {
+    if (!dragging) return;
+
+    const delta = e.clientY - startY;
+    const { scrollHeight, clientHeight } = container;
+    const scrollable = scrollHeight - clientHeight;
+    const trackHeight = clientHeight - thumbHeight - topOffset;
+
+    container.scrollTop = startScroll + (delta / trackHeight) * scrollable;
+  }
+
+  /** End dragging */
+  function endDrag(e: PointerEvent) {
+    dragging = false;
+    thumb.releasePointerCapture(e.pointerId);
+  }
+
+  // Reactive effect to update scrollbar
+  $effect(() => updateScrollbar());
+
+  // ResizeObserver for dynamic content
+  $effect(() => {
+    if (!container) return;
+    const observer = new ResizeObserver(updateScrollbar);
+    observer.observe(container);
+    return () => observer.disconnect();
+  });
+</script>
+
+<div class="wrapper" bind:this={wrapper}>
+  <!-- Scrollable content -->
+  <div class={`content ${className}`} bind:this={container} onscroll={updateScrollbar}>
+    {@render children?.()}
+  </div>
+
+  <!-- Custom scrollbar -->
+  <div class="scrollbar" style="top: {topOffset}px;">
+    <div
+      class="thumb"
+      bind:this={thumb}
+      onpointerdown={startDrag}
+      onpointermove={drag}
+      onpointerup={endDrag}
+      onpointercancel={endDrag}
+      style="height:{thumbHeight}px; transform:translateY({thumbTop}px);"
+    ></div>
+  </div>
+</div>
+
+<style>
+  .wrapper {
+    position: relative;
+    height: 100%;
+    width: 100%;
+  }
+
+  /* Scrollable content */
+  .content {
+    height: 100%;
+    overflow-y: auto;
+    overflow-x: hidden;
+
+    scrollbar-width: none; /* Firefox */
+  }
+
+  .content::-webkit-scrollbar {
+    display: none; /* Chrome, Safari, Edge */
+  }
+
+  /* Scrollbar track */
+  .scrollbar {
+    position: absolute;
+    right: 2px;
+    bottom: 0;
+    width: 12px;
+    background: var(--color-theme-950);
+    border-radius: 999px;
+  }
+
+  /* Thumb */
+  .thumb {
+    position: absolute;
+    width: 100%;
+    background: var(--color-theme-800);
+    border-radius: 999px;
+    cursor: grab;
+    transition: background 0.15s;
+  }
+
+  .thumb:active {
+    cursor: grabbing;
+    background: var(--color-theme-600);
+  }
+
+  .thumb:hover {
+    background: var(--color-theme-700);
+  }
+</style>