Improve and simplify scrolling

packages/frontend-core/src/components/grid/overlays/ReorderOverlay.svelte

@@ -6,14 +6,14 @@
   const {
     isReordering,
     reorder,
-    visibleColumnLookupMap,
+    columnLookupMap,
     rowHeight,
     renderedRows,
     scrollLeft,
     bodyLeft,
   } = getContext("grid")
 
-  $: targetColumn = $visibleColumnLookupMap[$reorder.targetColumn]
+  $: targetColumn = $columnLookupMap[$reorder.targetColumn]
   $: insertAfter = $reorder.insertAfter
   $: left = getLeft(targetColumn, insertAfter, $scrollLeft)
   $: height = $rowHeight * $renderedRows.length + DefaultRowHeight
@@ -21,6 +21,7 @@
   $: visible = $isReordering && left >= $bodyLeft
 
   const getLeft = (targetColumn, insertAfter, scrollLeft) => {
+    console.log(targetColumn)
     if (!targetColumn) {
       return 0
     }

packages/frontend-core/src/components/grid/stores/clipboard.js

@@ -63,7 +63,7 @@ export const createActions = context => {
     rowChangeCache,
     rows,
     focusedCellId,
-    visibleColumnLookupMap,
+    columnLookupMap,
     allVisibleColumns,
   } = context
 
@@ -156,9 +156,9 @@ export const createActions = context => {
         const $focusedCellId = get(focusedCellId)
         const { rowId, field } = parseCellID($focusedCellId)
         const $rowLookupMap = get(rowLookupMap)
-        const $visibleColumnLookupMap = get(visibleColumnLookupMap)
+        const $columnLookupMap = get(columnLookupMap)
         const rowIdx = $rowLookupMap[rowId].__idx
-        const colIdx = $visibleColumnLookupMap[field].__idx
+        const colIdx = $columnLookupMap[field].__idx
 
         // Get limits of how many rows and columns we're able to paste into
         const $rows = get(rows)

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

@@ -5,10 +5,21 @@ export const createStores = () => {
   const columns = writable([])
 
   const enrichedColumns = derived(columns, $columns => {
-    return $columns.map((col, idx) => ({
-      ...col,
-      __idx: idx,
-    }))
+    let offset = GutterWidth
+    let visibleIdx = 0
+    return $columns.map((col, idx) => {
+      const enriched = {
+        ...col,
+        __idx: idx, // Overall column index
+        __visibleIdx: visibleIdx, // Index within the visible columns
+        __left: offset, // Left offset relative to all visible columns
+      }
+      if (col.visible) {
+        visibleIdx++
+        offset += col.width
+      }
+      return enriched
+    })
   })
 
   return {
@@ -22,11 +33,6 @@ export const createStores = () => {
 export const deriveStores = context => {
   const { columns } = context
 
-  // Derive the primary display column
-  const displayColumn = derived(columns, $columns => {
-    return $columns.find(col => col.primaryDisplay)
-  })
-
   // Derive a lookup map for all columns by name
   const columnLookupMap = derived(columns, $columns => {
     let map = {}
@@ -36,33 +42,15 @@ export const deriveStores = context => {
     return map
   })
 
-  // Derived list of columns which have not been explicitly hidden, and enrich
-  // with an index so we can easily select nearby columns
+  // Derived list of columns which have not been explicitly hidden
   const visibleColumns = derived(columns, $columns => {
-    let offset = GutterWidth
-    return $columns
-      .filter(col => col.visible)
-      .map((col, idx) => {
-        const enriched = {
-          ...col,
-          __left: offset,
-          __idx: idx,
-        }
-        offset += col.width
-        return enriched
-      })
+    return $columns.filter(col => col.visible)
   })
 
-  // Derive a lookup map for visible columns by name
-  const visibleColumnLookupMap = derived(visibleColumns, $visibleColumns => {
-    let map = {}
-    $visibleColumns.forEach(column => {
-      map[column.name] = column
-    })
-    return map
+  // Split visible columns into their discrete types
+  const displayColumn = derived(visibleColumns, $visibleColumns => {
+    return $visibleColumns.find(col => col.primaryDisplay)
   })
-
-  // Derive scrollable columns
   const scrollableColumns = derived(visibleColumns, $visibleColumns => {
     return $visibleColumns.filter(col => !col.primaryDisplay)
   })
@@ -79,7 +67,6 @@ export const deriveStores = context => {
     displayColumn,
     columnLookupMap,
     visibleColumns,
-    visibleColumnLookupMap,
     scrollableColumns,
     hasNonAutoColumn,
   }

packages/frontend-core/src/components/grid/stores/reorder.js

@@ -30,14 +30,14 @@ export const createActions = context => {
     columns,
     columnLookupMap,
     scrollableColumns,
-    visibleColumnLookupMap,
     scroll,
     bounds,
     visibleColumns,
-    maxScrollLeft,
     datasource,
     bodyLeft,
     width,
+    scrollLeft,
+    maxScrollLeft,
   } = context
   let latestX = 0
   let autoScrollInterval
@@ -94,17 +94,19 @@ export const createActions = context => {
     considerReorderPosition()
 
     // Check if we need to start auto-scrolling
+    const $scrollLeft = get(scrollLeft)
+    const $maxScrollLeft = get(maxScrollLeft)
     const $reorder = get(reorder)
     const proximityCutoff = Math.min(140, get(width) / 6)
     const speedFactor = 16
     const rightProximity = Math.max(0, $reorder.gridLeft + $reorder.width - x)
     const leftProximity = Math.max(0, x - $reorder.gridLeft)
-    if (rightProximity < proximityCutoff) {
+    if (rightProximity < proximityCutoff && $scrollLeft < $maxScrollLeft) {
       const weight = proximityCutoff - rightProximity
       const increment = (weight / proximityCutoff) * speedFactor
       reorder.update(state => ({ ...state, increment }))
       startAutoScroll()
-    } else if (leftProximity < proximityCutoff) {
+    } else if (leftProximity < proximityCutoff && $scrollLeft > 0) {
       const weight = -1 * (proximityCutoff - leftProximity)
       const increment = (weight / proximityCutoff) * speedFactor
       reorder.update(state => ({ ...state, increment }))
@@ -180,20 +182,26 @@ export const createActions = context => {
     document.removeEventListener("touchcancel", stopReordering)
 
     // Ensure there's actually a change before saving
-    const { sourceColumn, targetColumn } = get(reorder)
+    const { sourceColumn, targetColumn, insertAfter } = get(reorder)
     reorder.set(reorderInitialState)
     if (sourceColumn !== targetColumn) {
-      await moveColumn(sourceColumn, targetColumn)
+      await moveColumn({ sourceColumn, targetColumn, insertAfter })
     }
   }
 
   // Moves a column after another columns.
   // An undefined target column will move the source to index 0.
-  const moveColumn = async (sourceColumn, targetColumn) => {
+  const moveColumn = async ({
+    sourceColumn,
+    targetColumn,
+    insertAfter = false,
+  }) => {
     const $columnLookupMap = get(columnLookupMap)
-    let sourceIdx = $columnLookupMap[sourceColumn]
-    let targetIdx = $columnLookupMap[targetColumn]
-    targetIdx++
+    let sourceIdx = $columnLookupMap[sourceColumn].__idx
+    let targetIdx = $columnLookupMap[targetColumn].__idx
+    if (insertAfter) {
+      targetIdx++
+    }
     columns.update(state => {
       const removed = state.splice(sourceIdx, 1)
       if (--targetIdx < sourceIdx) {
@@ -214,20 +222,26 @@ export const createActions = context => {
   // Moves a column one place left (as appears visually)
   const moveColumnLeft = async column => {
     const $visibleColumns = get(visibleColumns)
-    const $visibleColumnLookupMap = get(visibleColumnLookupMap)
-    const sourceIdx = $visibleColumnLookupMap[column]
-    await moveColumn(column, $visibleColumns[sourceIdx - 2]?.name)
+    const $columnLookupMap = get(columnLookupMap)
+    const sourceIdx = $columnLookupMap[column]
+    await moveColumn({
+      sourceColumn: column,
+      targetColumn: $visibleColumns[sourceIdx - 2]?.name,
+    })
   }
 
   // Moves a column one place right (as appears visually)
   const moveColumnRight = async column => {
     const $visibleColumns = get(visibleColumns)
-    const $visibleColumnLookupMap = get(visibleColumnLookupMap)
-    const sourceIdx = $visibleColumnLookupMap[column]
+    const $columnLookupMap = get(columnLookupMap)
+    const sourceIdx = $columnLookupMap[column]
     if (sourceIdx === $visibleColumns.length - 1) {
       return
     }
-    await moveColumn(column, $visibleColumns[sourceIdx + 1]?.name)
+    await moveColumn({
+      sourceColumn: column,
+      targetColumn: $visibleColumns[sourceIdx + 1]?.name,
+    })
   }
 
   return {