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feat: Add overlap detection plugin with visual helpers and performance optimizations #233

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feat: Add overlap detection plugin with visual helpers and performance optimizations #233

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627494e
feat: add overlap detection plugin for NeoDrag
aayushchouhan24 Jul 29, 2025
c5bd00f
feat: implement overlap detection functionality in KitchenSinkDemo an…
aayushchouhan24 Jul 29, 2025
5dae68f
refactor: streamline overlap plugin configuration and improve perform…
aayushchouhan24 Jul 29, 2025
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49 changes: 48 additions & 1 deletion docs/src/components/examples/KitchenSinkDemo.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
draggable,
events,
grid,
overlap,
position,
scrollLock,
} from '@neodrag/svelte';
Expand Down Expand Up @@ -48,7 +49,7 @@

let is_backdrop_visible = $state(false);

let z_indices = $state(Array.from<number>({ length: 15 }).fill(0));
let z_indices = $state(Array.from<number>({ length: 17 }).fill(0));

function get_node_index(node: HTMLElement) {
return Array.from(node.parentNode?.children!).indexOf(node);
Expand Down Expand Up @@ -90,6 +91,24 @@
},
};

// Overlap demo handlers without backdrop blur
const overlap_drag_handlers: Parameters<typeof events>[0] = {
onDrag: ({ rootNode }) => {
// No backdrop blur for overlap demo
rootNode.style.zIndex = '20';
},
onDragEnd: ({ rootNode }) => {
setTimeout(() => {
update_z_index(rootNode);
}, 200);
},
};

// ===== OVERLAP PLUGIN DEMO - START =====
let overlap_count = $state(0);
let show_overlap_enabled = $state(true);
// ===== OVERLAP PLUGIN DEMO - END =====

let return_to_position_val = $state({
x: 0,
y: 0,
Expand Down Expand Up @@ -385,10 +404,38 @@
I will return to my position on drop, but with style! 😉
</div>

<!-- ===== OVERLAP PLUGIN DEMO ===== -->
<div
class="box"
data-paw-cursor="true"
data-overlap-demo="true"
style:z-index={z_indices[15]}
{@attach draggable([
overlap({
targets: '.box:not([data-overlap-demo])',
threshold: 0.1,
onOverlapUpdate: (targets) => overlap_count = targets.length,
showOverlap: {
enabled: show_overlap_enabled,
}
}),
events(overlap_drag_handlers),
])}
>
Overlap detection
<br />
Overlapping: {overlap_count}
<br />
<label style="font-size: 0.8em; display: flex; align-items: center; justify-content: center; gap: 0.3rem; margin-top: 0.5rem;">
<input type="checkbox" bind:checked={show_overlap_enabled} style="margin: 0;" />
Show overlap
</label>
</div>

<div
class="box"
data-paw-cursor="true"
style:z-index={z_indices[16]}
{@attach draggable([disabled(), events(drag_handlers)])}
>
<code>disabled: true</code>
Expand Down
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