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Add touch support for layer reordering in layers panel #3

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Add touch support for layer reordering in layers panel #3

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52 changes: 52 additions & 0 deletions src/lib/components/editor/panels/layers-panel.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,11 @@

let prompt = '';

// Touch drag state
let touchDragIndex = $state<number | null>(null);
let touchDragOverIndex = $state<number | null>(null);
let layerElements: HTMLElement[] = [];

function selectLayer(layerId: string) {
projectStore.selectedLayerId = layerId;
}
Expand Down Expand Up @@ -53,6 +58,48 @@
selectLayer(layerId);
}
}

// Touch drag handlers
function handleTouchStart(e: TouchEvent, index: number) {
touchDragIndex = index;
touchDragOverIndex = index;

window.addEventListener('touchmove', handleTouchMove, { passive: false });
window.addEventListener('touchend', handleTouchEnd);
window.addEventListener('touchcancel', handleTouchEnd);
}

function handleTouchMove(e: TouchEvent) {
if (touchDragIndex === null) return;

e.preventDefault();
const touchY = e.touches[0].clientY;

// Find which layer the touch is currently over
for (let i = 0; i < layerElements.length; i++) {
const el = layerElements[i];
if (!el) continue;

const rect = el.getBoundingClientRect();
if (touchY >= rect.top && touchY <= rect.bottom) {
touchDragOverIndex = i;
break;
}
}
}

function handleTouchEnd() {
if (touchDragIndex !== null && touchDragOverIndex !== null && touchDragIndex !== touchDragOverIndex) {
projectStore.reorderLayers(touchDragIndex, touchDragOverIndex);
}

touchDragIndex = null;
touchDragOverIndex = null;

window.removeEventListener('touchmove', handleTouchMove);
window.removeEventListener('touchend', handleTouchEnd);
window.removeEventListener('touchcancel', handleTouchEnd);
}
</script>

<div
Expand All @@ -70,14 +117,19 @@
<div class="space-y-1 p-2">
{#each projectStore.project.layers as layer, index (layer.id)}
<div
bind:this={layerElements[index]}
class="group flex cursor-pointer items-center gap-2 rounded-md px-3 py-2 transition-colors hover:bg-muted/50"
class:bg-muted={projectStore.selectedLayerId === layer.id}
class:opacity-50={touchDragIndex === index}
class:ring-2={touchDragOverIndex === index && touchDragIndex !== null && touchDragIndex !== index}
class:ring-primary={touchDragOverIndex === index && touchDragIndex !== null && touchDragIndex !== index}
onclick={() => selectLayer(layer.id)}
onkeydown={(e) => handleKeyDown(e, layer.id)}
draggable="true"
ondragstart={(e) => handleDragStart(e, index)}
ondragover={handleDragOver}
ondrop={(e) => handleDrop(e, index)}
ontouchstart={(e) => handleTouchStart(e, index)}
role="button"
tabindex="0"
>
Expand Down