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Flush tile grid + macOS-style seam pill for resizing adjacent tiles

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Tiles now sit with zero gap (their 1px borders are the only seam) and the
grid runs edge to edge. Wherever two tiles share a vertical edge, an
invisible strip sits on the seam; hovering reveals a small grab pill
(split-view style) and dragging it moves the shared edge, trading width
between the two tiles. The combined span is preserved, both tiles' min
sizes are honored, and a third tile sitting behind part of the seam
blocks the drag instead of being overlapped. Pills hide during tile
drags/resizes and rebuild for the new geometry on release; seam sizes
persist with the layout. Also fixes cellMetrics treating a 0px grid gap
as falsy and falling back to 10px.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RNYUv9EyrGSFmCnmH7WYKH
This commit is contained in:
Claude
2026-08-30 16:16:32 +00:00
parent b14bc4a182
commit af46499d92
3 changed files with 144 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
public/shell.js
+105 -5
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@@ -161,7 +161,8 @@ function newId() {
function cellMetrics() {
const style = getComputedStyle(grid);
const gap = parseFloat(style.columnGap) || 10;
const gapRaw = parseFloat(style.columnGap);
const gap = Number.isFinite(gapRaw) ? gapRaw : 0;
const cw = (grid.clientWidth - gap * (COLS - 1)) / COLS;
const ch = parseFloat(style.gridAutoRows) || 72;
return { cw, ch, gap };
@@ -171,9 +172,13 @@ function overlaps(a, b) {
return a.x < b.x + b.w && b.x < a.x + a.w && a.y < b.y + b.h && b.y < a.y + a.h;
}
function isFree(rect, excludeId) {
function isFreeExcept(rect, excludeIds) {
if (rect.x < 0 || rect.y < 0 || rect.x + rect.w > COLS) return false;
return !tiles.some((t) => t.id !== excludeId && overlaps(rect, t));
return !tiles.some((t) => !excludeIds.includes(t.id) && overlaps(rect, t));
}
function isFree(rect, excludeId) {
return isFreeExcept(rect, [excludeId]);
}
/** First free spot scanning top-to-bottom, left-to-right. */
@@ -296,6 +301,7 @@ function wireDrag(tile, el, handle) {
if (!moved && (dCols || dRows)) {
moved = true;
el.classList.add('dragging');
grid.classList.add('no-dividers');
}
const cand = {
x: Math.max(0, Math.min(COLS - tile.w, startX + dCols)),
@@ -314,7 +320,11 @@ function wireDrag(tile, el, handle) {
handle.removeEventListener('pointerup', onUp);
handle.removeEventListener('pointercancel', onUp);
el.classList.remove('dragging');
if (moved) saveLayout();
grid.classList.remove('no-dividers');
if (moved) {
saveLayout();
rebuildDividers();
}
};
handle.addEventListener('pointermove', onMove);
handle.addEventListener('pointerup', onUp);
@@ -337,6 +347,7 @@ function wireResize(tile, el, handle) {
const startH = tile.h;
const min = minSizeOf(tile);
el.classList.add('resizing');
grid.classList.add('no-dividers');
let changed = false;
const onMove = (e) => {
@@ -361,7 +372,11 @@ function wireResize(tile, el, handle) {
handle.removeEventListener('pointerup', onUp);
handle.removeEventListener('pointercancel', onUp);
el.classList.remove('resizing');
if (changed) saveLayout();
grid.classList.remove('no-dividers');
if (changed) {
saveLayout();
rebuildDividers();
}
};
handle.addEventListener('pointermove', onMove);
handle.addEventListener('pointerup', onUp);
@@ -376,6 +391,88 @@ function notifyResize(tile) {
} catch { /* module's problem, not the shell's */ }
}
/* ── seam dividers between adjacent tiles ───────────────────────────── */
/* Wherever two tiles share a vertical edge, a divider sits on the seam.
Dragging its pill moves the shared edge, trading width between the two
tiles — their combined span never changes, so nothing else can collide
except via the explicit check below (a third tile can sit behind the
seam for part of its height). */
function rebuildDividers() {
grid.querySelectorAll('.tile-divider').forEach((el) => el.remove());
for (const L of tiles) {
for (const R of tiles) {
if (L === R || L.x + L.w !== R.x) continue;
const top = Math.max(L.y, R.y);
const bottom = Math.min(L.y + L.h, R.y + R.h);
if (bottom <= top) continue;
buildDivider(L, R, top, bottom);
}
}
}
function buildDivider(L, R, top, bottom) {
const el = document.createElement('div');
el.className = 'tile-divider';
el.title = 'Drag to resize';
const place = () => {
const m = cellMetrics();
// left as a percentage so the pill tracks window resizes for free
el.style.left = ((L.x + L.w) / COLS) * 100 + '%';
el.style.top = top * (m.ch + m.gap) + 'px';
el.style.height = (bottom - top) * (m.ch + m.gap) - m.gap + 'px';
};
place();
el.addEventListener('pointerdown', (ev) => {
if (ev.button !== 0 && ev.pointerType === 'mouse') return;
ev.preventDefault();
closeSettingsPopovers();
el.setPointerCapture(ev.pointerId);
el.classList.add('active');
const m = cellMetrics();
const sx = ev.clientX;
const startBoundary = L.x + L.w;
const rightEdge = R.x + R.w; // fixed for the whole drag
const minB = L.x + minSizeOf(L).w;
const maxB = rightEdge - minSizeOf(R).w;
let changed = false;
const onMove = (e) => {
const b = Math.max(minB, Math.min(maxB,
startBoundary + Math.round((e.clientX - sx) / (m.cw + m.gap))));
if (b === L.x + L.w) return;
const candL = { x: L.x, y: L.y, w: b - L.x, h: L.h };
const candR = { x: b, y: R.y, w: rightEdge - b, h: R.h };
if (!isFreeExcept(candL, [L.id, R.id]) || !isFreeExcept(candR, [L.id, R.id])) return;
L.w = candL.w;
R.x = candR.x;
R.w = candR.w;
applyRect(L);
applyRect(R);
notifyResize(L);
notifyResize(R);
place();
changed = true;
};
const onUp = () => {
el.removeEventListener('pointermove', onMove);
el.removeEventListener('pointerup', onUp);
el.removeEventListener('pointercancel', onUp);
el.classList.remove('active');
if (changed) saveLayout();
rebuildDividers(); // adjacencies may have changed
};
el.addEventListener('pointermove', onMove);
el.addEventListener('pointerup', onUp);
el.addEventListener('pointercancel', onUp);
});
grid.appendChild(el);
}
/* ── add / remove tiles ─────────────────────────────────────────────── */
function addTile(moduleId) {
@@ -394,6 +491,7 @@ function addTile(moduleId) {
buildTile(tile);
refreshEmptyState();
saveLayout();
rebuildDividers();
}
function removeTile(id) {
@@ -408,6 +506,7 @@ function removeTile(id) {
}
refreshEmptyState();
saveLayout();
rebuildDividers();
}
function clearAllTiles() {
@@ -686,6 +785,7 @@ function renderLayout(list) {
tiles = list.map(sanitizeTile);
for (const tile of tiles) buildTile(tile);
refreshEmptyState();
rebuildDividers();
}
/* ── menus ──────────────────────────────────────────────────────────── */