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fix: sheet drag-and-drop showed a blocked cursor and never dropped

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Tauri's window-level file-drop hook (needed for dragging a .numi file
in from Explorer) intercepts WebView2's own drag-and-drop session, so
native HTML5 draggable="true" elements never get a valid drop target
inside the webview — the OS always shows "not allowed", confirmed
with an actual mouse-drag simulation before this fix.

Replaced with plain pointer tracking (mousedown/mousemove/mouseup),
the same pattern already used for the results-column divider — full
control over the cursor and the drag-over indicator, no dependency on
the webview's native DnD stack, and it doesn't touch the unrelated
OS file-drop feature at all.
This commit is contained in:
Horizontal42 2026-07-03 13:12:44 +03:00
parent 7b94f6a5b0
commit ad8e1960d7
1 changed files with 47 additions and 26 deletions
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69
src/main.ts
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@ -94,15 +94,12 @@ function reorderDoc(srcId: string, targetId: string): void {
renderDocList();
}
let dragSrcId: string | null = null;
function renderDocList(): void {
const list = $("#doc-list");
list.replaceChildren();
for (const doc of data.docs) {
const el = document.createElement("div");
el.className = "doc-item" + (doc.id === data.activeId ? " active" : "") + (doc.pinned ? " pinned" : "");
el.draggable = true;
const name = document.createElement("span");
name.className = "doc-name";
name.textContent = doc.title || t("untitled");
@ -119,30 +116,55 @@ function renderDocList(): void {
el.appendChild(mkBtn("pin-btn" + (doc.pinned ? " active" : ""), "📌", doc.pinned ? t("unpin") : t("pin"), () => pinDoc(doc.id)));
el.addEventListener("dragstart", (e) => {
dragSrcId = doc.id;
// Reordering uses plain mouse tracking, not the native HTML5 drag API —
// Tauri's window-level file-drop hook (dragDropEnabled, needed for
// dropping .numi files from Explorer) intercepts WebView2's own drag
// sessions, so draggable="true" elements never get a valid drop target
// and the OS always shows a "not allowed" cursor.
let dragging = false;
let suppressClick = false;
el.addEventListener("mousedown", (e) => {
if ((e.target as HTMLElement).closest("button")) return;
const startY = e.clientY;
const onMove = (ev: MouseEvent) => {
if (!dragging) {
if (Math.abs(ev.clientY - startY) < 4) return;
dragging = true;
suppressClick = true;
el.classList.add("dragging");
e.dataTransfer!.effectAllowed = "move";
e.dataTransfer?.setData("text/plain", doc.id);
document.body.style.cursor = "grabbing";
}
const items = [...list.querySelectorAll<HTMLElement>(".doc-item")];
for (const item of items) item.classList.remove("drag-over");
const over = items.find((item) => {
if (item === el) return false;
const r = item.getBoundingClientRect();
return ev.clientY >= r.top && ev.clientY <= r.bottom;
});
el.addEventListener("dragend", () => {
el.classList.remove("dragging");
dragSrcId = null;
for (const other of list.querySelectorAll(".doc-item")) other.classList.remove("drag-over");
if (over) {
const overDoc = data.docs.find((d) => d.id === over.dataset.docId);
if (overDoc && !!overDoc.pinned === !!doc.pinned) over.classList.add("drag-over");
}
};
const onUp = () => {
window.removeEventListener("mousemove", onMove);
window.removeEventListener("mouseup", onUp);
if (dragging) {
const target = list.querySelector<HTMLElement>(".doc-item.drag-over");
for (const item of list.querySelectorAll(".doc-item")) item.classList.remove("drag-over", "dragging");
document.body.style.cursor = "";
if (target?.dataset.docId) reorderDoc(doc.id, target.dataset.docId);
}
dragging = false;
};
window.addEventListener("mousemove", onMove);
window.addEventListener("mouseup", onUp);
});
el.addEventListener("dragover", (e) => {
if (!dragSrcId || dragSrcId === doc.id) return;
const src = data.docs.find((d) => d.id === dragSrcId);
if (!src || !!src.pinned !== !!doc.pinned) return; // can't cross the pin boundary
e.preventDefault(); // allow drop
for (const other of list.querySelectorAll(".doc-item")) other.classList.remove("drag-over");
el.classList.add("drag-over");
});
el.addEventListener("drop", (e) => {
e.preventDefault();
el.classList.remove("drag-over");
if (dragSrcId) reorderDoc(dragSrcId, doc.id);
el.addEventListener("click", () => {
if (suppressClick) { suppressClick = false; return; }
switchDoc(doc.id);
});
el.dataset.docId = doc.id;
const del = document.createElement("button");
del.className = "del";
@ -169,7 +191,6 @@ function renderDocList(): void {
saveAppData(data);
});
el.appendChild(del);
el.addEventListener("click", () => switchDoc(doc.id));
list.appendChild(el);
}
}