Fix some scroll issues and add shadow to sticky column

packages/frontend-core/src/components/sheet/HeaderRow.svelte

@@ -5,8 +5,7 @@
   import { getIconForField } from "./utils"
   import SheetScrollWrapper from "./SheetScrollWrapper.svelte"
 
-  const { visibleColumns, reorder, selectedRows, rows } =
-    getContext("spreadsheet")
+  const { visibleColumns, reorder } = getContext("spreadsheet")
 </script>
 
 <div>

packages/frontend-core/src/components/sheet/NewRow.svelte

@@ -1,11 +1,12 @@
 <script>
   import SheetCell from "./SheetCell.svelte"
-  import { Icon } from "@budibase/bbui"
   import { getContext } from "svelte"
 
-  const { visibleColumns, cellHeight, rows, selectedCellId, reorder } =
+  const { visibleColumns, hoveredRowId, rows, selectedCellId, reorder } =
     getContext("spreadsheet")
 
+  $: rowHovered = $hoveredRowId === "new"
+
   const addRow = async field => {
     const newRow = await rows.actions.addRow()
     if (newRow) {
@@ -14,9 +15,10 @@
   }
 </script>
 
-<div class="row new">
+<div class="row" on:mouseover={() => ($hoveredRowId = "new")}>
   {#each $visibleColumns as column}
     <SheetCell
+      {rowHovered}
       on:click={() => addRow(column)}
       width={column.width}
       left={column.left}
@@ -30,8 +32,7 @@
   .row {
     display: flex;
   }
-  :global(.sheet:not(.is-resizing):not(.is-reordering) .row:hover .cell) {
-    background: var(--cell-background-hover);
+  .row:hover :global(.cell) {
     cursor: pointer;
   }
 </style>

packages/frontend-core/src/components/sheet/Sheet.svelte

@@ -31,6 +31,7 @@
   const tableIdStore = writable()
   const selectedCellId = writable()
   const selectedRows = writable({})
+  const hoveredRowId = writable()
   const scroll = writable({
     left: 0,
     top: 0,
@@ -51,6 +52,7 @@
     cellHeight,
     bounds,
     scroll,
+    hoveredRowId,
     tableId: tableIdStore,
   }
   const { rows, schema } = createRowsStore(context)
@@ -114,7 +116,7 @@
     display: flex;
     flex-direction: row;
     justify-items: flex-start;
-    align-items: stretch;
+    align-items: flex-start;
     overflow: hidden;
     height: 0;
     position: relative;
@@ -124,5 +126,6 @@
     overflow: hidden;
     display: flex;
     flex-direction: column;
+    align-self: stretch;
   }
 </style>

packages/frontend-core/src/components/sheet/SheetBody.svelte

@@ -1,18 +1,11 @@
 <script>
   import { getContext, onMount } from "svelte"
-  import { Utils } from "../../utils"
   import SheetScrollWrapper from "./SheetScrollWrapper.svelte"
 
-  const { columns, selectedCellId, cellHeight, rows, bounds, scroll } =
-    getContext("spreadsheet")
-
-  const padding = 180
+  const { selectedCellId, hoveredRowId, bounds } = getContext("spreadsheet")
 
   let ref
 
-  $: scrollLeft = $scroll.left
-  $: scrollTop = $scroll.top
-
   onMount(() => {
     // Observe and record the height of the body
     const observer = new ResizeObserver(() => {
@@ -28,8 +21,8 @@
 <div
   bind:this={ref}
   class="sheet-body"
-  class:horizontally-scrolled={scrollLeft > 0}
   on:click|self={() => ($selectedCellId = null)}
+  on:mouseleave={() => ($hoveredRowId = null)}
 >
   <SheetScrollWrapper>
     <slot />
@@ -44,20 +37,4 @@
     overflow: hidden;
     flex: 1 1 auto;
   }
-  .sheet-body::-webkit-scrollbar-track {
-    background: transparent;
-  }
-
-  /* Add shadow to sticky cells when horizontally scrolled */
-  .horizontally-scrolled :global(.cell.sticky) {
-    border-right-width: 1px;
-  }
-  .horizontally-scrolled :global(.cell.sticky:after) {
-    content: " ";
-    position: absolute;
-    width: 10px;
-    left: 100%;
-    height: 100%;
-    background: linear-gradient(to right, rgba(0, 0, 0, 0.08), transparent);
-  }
 </style>

packages/frontend-core/src/components/sheet/SheetCell.svelte

@@ -1,9 +1,8 @@
-<svelte:options immutable={true} />
-
 <script>
   export let header = false
   export let label = false
   export let rowSelected = false
+  export let rowHovered = false
   export let sticky = false
   export let selected = false
   export let reorderSource = false
@@ -16,12 +15,12 @@
   class:header
   class:label
   class:row-selected={rowSelected}
+  class:row-hovered={rowHovered}
   class:sticky
   class:selected
   class:reorder-source={reorderSource}
   class:reorder-target={reorderTarget}
   on:focus
-  on:mouseenter
   on:click
   on:mousedown
   style="--width:{width}px;"
@@ -64,6 +63,9 @@
   .cell.row-selected {
     background-color: var(--spectrum-global-color-gray-100);
   }
+  .cell.row-hovered {
+    background: var(--cell-background-hover);
+  }
 
   /* Header cells */
   .cell.header {

packages/frontend-core/src/components/sheet/SheetRow.svelte

@@ -7,17 +7,25 @@
 
   export let row
 
-  const { selectedCellId, reorder, selectedRows, rows, visibleColumns } =
-    getContext("spreadsheet")
+  const {
+    selectedCellId,
+    reorder,
+    selectedRows,
+    rows,
+    visibleColumns,
+    hoveredRowId,
+  } = getContext("spreadsheet")
 
   $: rowSelected = !!$selectedRows[row._id]
+  $: rowHovered = $hoveredRowId === row._id
 </script>
 
-<div class="row">
+<div class="row" on:mouseover={() => ($hoveredRowId = row._id)}>
   {#each $visibleColumns as column (column.name)}
     {@const cellIdx = `${row._id}-${column.name}`}
     <SheetCell
       {rowSelected}
+      {rowHovered}
       selected={$selectedCellId === cellIdx}
       reorderSource={$reorder.columnIdx === column.idx}
       reorderTarget={$reorder.swapColumnIdx === column.idx}
@@ -41,7 +49,4 @@
   .row {
     display: flex;
   }
-  :global(.sheet:not(.is-resizing):not(.is-reordering) .row:hover .cell) {
-    background: var(--cell-background-hover);
-  }
 </style>

packages/frontend-core/src/components/sheet/SheetScrollWrapper.svelte

@@ -69,11 +69,11 @@
     const offset = deltaY * step
     let newScrollTop = scrollTop
     newScrollTop += offset
-    newScrollTop = Math.max(0, newScrollTop)
     newScrollTop = Math.min(
       newScrollTop,
       ($rows.length + 1) * cellHeight - $bounds.height
     )
+    newScrollTop = Math.max(0, newScrollTop)
     scroll.update(state => ({
       ...state,
       top: newScrollTop,
@@ -91,6 +91,8 @@
 
 <style>
   .scroll-wrapper {
+    min-width: 100%;
+    min-height: 100%;
     background: var(--background-alt);
     transform: translate3d(var(--offset-x), var(--offset-y), 0);
     overflow: hidden;

packages/frontend-core/src/components/sheet/StickyColumn.svelte

@@ -6,9 +6,17 @@
   import { getCellComponent } from "./utils"
   import SheetScrollWrapper from "./SheetScrollWrapper.svelte"
 
-  const { rows, selectedRows, stickyColumn, visibleRows, selectedCellId } =
-    getContext("spreadsheet")
+  const {
+    rows,
+    selectedRows,
+    stickyColumn,
+    visibleRows,
+    selectedCellId,
+    hoveredRowId,
+    scroll,
+  } = getContext("spreadsheet")
 
+  $: scrollLeft = $scroll.left
   $: rowCount = $rows.length
   $: selectedRowCount = Object.values($selectedRows).filter(x => !!x).length
   $: width = 40 + $stickyColumn?.width || 0
@@ -41,7 +49,11 @@
   }
 </script>
 
-<div class="sticky-column" style="--width:{width}px;">
+<div
+  class="sticky-column"
+  style="--width:{width}px;"
+  class:scrolled={scrollLeft > 0}
+>
   <div class="row">
     <!-- Field headers -->
     <SheetCell header label on:click={selectAll} width="40" left="0">
@@ -67,70 +79,96 @@
     {/if}
   </div>
 
-  <SheetScrollWrapper scrollHorizontally={false}>
-    {#each $visibleRows as row}
-      {@const rowSelected = !!$selectedRows[row._id]}
-      <div class="row">
+  <div on:mouseleave={() => ($hoveredRowId = null)}>
+    <SheetScrollWrapper scrollHorizontally={false}>
+      {#each $visibleRows as row}
+        {@const rowSelected = !!$selectedRows[row._id]}
+        {@const rowHovered = $hoveredRowId === row._id}
+        <div class="row" on:mouseenter={() => ($hoveredRowId = row._id)}>
+          <SheetCell
+            label
+            {rowSelected}
+            {rowHovered}
+            on:click={() => selectRow(row._id)}
+            width="40"
+          >
+            <div class="checkbox" class:visible={rowSelected || rowHovered}>
+              <Checkbox value={rowSelected} />
+            </div>
+            <div class="number" class:visible={!(rowSelected || rowHovered)}>
+              {row.__idx + 1}
+            </div>
+          </SheetCell>
+
+          {#if $stickyColumn}
+            {@const cellIdx = `${row._id}-${$stickyColumn.name}`}
+            <SheetCell
+              {rowSelected}
+              {rowHovered}
+              sticky
+              selected={$selectedCellId === cellIdx}
+              on:click={() => ($selectedCellId = cellIdx)}
+              width={$stickyColumn.width}
+              left="40"
+            >
+              <svelte:component
+                this={getCellComponent($stickyColumn)}
+                value={row[$stickyColumn.name]}
+                schema={$stickyColumn.schema}
+                selected={$selectedCellId === cellIdx}
+                onChange={val =>
+                  rows.actions.updateRow(row._id, $stickyColumn, val)}
+                readonly={$stickyColumn.schema.autocolumn}
+              />
+            </SheetCell>
+          {/if}
+        </div>
+      {/each}
+
+      <div class="row new" on:mouseover={() => ($hoveredRowId = "new")}>
         <SheetCell
+          rowHovered={$hoveredRowId === "new"}
           label
-          {rowSelected}
-          on:click={() => selectRow(row._id)}
+          on:click={addRow}
           width="40"
         >
-          <div class="checkbox" class:visible={rowSelected}>
-            <Checkbox value={rowSelected} />
-          </div>
-          <div class="number" class:visible={!rowSelected}>
-            {row.__idx + 1}
-          </div>
+          <Icon hoverable name="Add" size="S" />
         </SheetCell>
-
         {#if $stickyColumn}
-          {@const cellIdx = `${row._id}-${$stickyColumn.name}`}
           <SheetCell
-            {rowSelected}
-            sticky
-            selected={$selectedCellId === cellIdx}
-            on:click={() => ($selectedCellId = cellIdx)}
+            on:click={addRow}
             width={$stickyColumn.width}
-            left="40"
-          >
-            <svelte:component
-              this={getCellComponent($stickyColumn)}
-              value={row[$stickyColumn.name]}
-              schema={$stickyColumn.schema}
-              selected={$selectedCellId === cellIdx}
-              onChange={val =>
-                rows.actions.updateRow(row._id, $stickyColumn, val)}
-              readonly={$stickyColumn.schema.autocolumn}
-            />
-          </SheetCell>
+            rowHovered={$hoveredRowId === "new"}
+          />
         {/if}
       </div>
-    {/each}
-
-    <div class="row">
-      <SheetCell label on:click={addRow} width="40">
-        <Icon hoverable name="Add" size="S" />
-      </SheetCell>
-      {#if $stickyColumn}
-        <SheetCell on:click={addRow} width={$stickyColumn.width} left="40" />
-      {/if}
-    </div>
-  </SheetScrollWrapper>
+    </SheetScrollWrapper>
+  </div>
 </div>
 
 <style>
   .sticky-column {
     flex: 0 0 var(--width);
     z-index: 20;
+    overflow: visible;
+    border-right: 1px solid var(--spectrum-global-color-gray-200);
   }
+  .sticky-column.scrolled {
+    box-shadow: 1px -4px 8px rgba(0, 0, 0, 0.1);
+  }
+  .sticky-column :global(.cell) {
+    border-right-width: 0;
+  }
+
   .row {
     display: flex;
     flex-direction: row;
     justify-content: flex-start;
     align-items: stretch;
   }
+  .row.new:hover :global(.cell) {
+    cursor: pointer;
+  }
 
   /* Styles for label cell */
   .checkbox {
@@ -140,12 +178,9 @@
     display: none;
     color: var(--spectrum-global-color-gray-500);
   }
-  .row:hover .checkbox,
-  .checkbox.visible {
-    display: flex;
-  }
+  .checkbox.visible,
   .number.visible {
-    display: block;
+    display: flex;
   }
   .row:hover .number {
     display: none;

packages/frontend-core/src/components/sheet/stores/columns.js

@@ -6,6 +6,7 @@ export const createColumnsStores = context => {
   const columns = writable([])
   const stickyColumn = writable(null)
 
+  // Merge new schema fields with existing schema in order to preserve widths
   schema.subscribe($schema => {
     const currentColumns = get(columns)
     if (!$schema) {