fix: Fix issues when auto-size columns/rows is false, and when row he…

…aders are not 0 (deephaven#1927)

- Shouldn't throw in those cases, we should handle when calculatedSizes
is empty
- Found when using out
[deephaven-doom](https://github.com/mofojed/deephaven-doom), couldn't
resize/move columns like expected
- Also tested in the styleguide - dragging columns when there were row
headers visible did not work correctly

packages/grid/src/GridRenderer.ts

@@ -2323,7 +2323,9 @@ export class GridRenderer {
     );
     context.clip();
 
-    context.translate(draggingLeft - originalLeft, 0);
+    // The header drawing functions expect the context to be at the edge of the canvas
+    // We offset it by how much the user has dragged
+    context.translate(draggingLeft - originalLeft - gridX, 0);
     context.font = headerFont;
 
     const visibleColumns: VisibleIndex[] = [];
@@ -2352,11 +2354,14 @@ export class GridRenderer {
       }
     );
 
-    context.translate(0, gridY);
+    // Now move to the edge of the "grid" (top-left of top-left cell). We then draw the
+    // grid background, but only the clipped region will be drawn where the dragging column is.
+    context.translate(gridX, gridY);
     context.font = font;
 
     this.drawGridBackground(context, state);
 
+    // Then draw the contents of the column that is being dragged
     for (let i = startIndex; i <= endIndex; i += 1) {
       this.drawColumnCellContents(context, state, i);
     }

packages/grid/src/mouse-handlers/GridColumnMoveMouseHandler.ts

@@ -1,4 +1,5 @@
 import clamp from 'lodash.clamp';
+import { assertNotNull } from '@deephaven/utils';
 import Grid from '../Grid';
 import GridUtils, { GridPoint } from '../GridUtils';
 import GridMouseHandler, { GridMouseEvent } from '../GridMouseHandler';
@@ -381,6 +382,9 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
     ) {
       return;
     }
+    const { metrics } = grid;
+    assertNotNull(metrics, 'Metrics not set');
+    const { gridX } = metrics;
 
     // Cursor has moved past the column drag bounds, don't move the column until we hit the initial offset point again
     if (this.initialOffset !== this.draggingOffset) {
@@ -400,7 +404,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
 
       this.draggingColumn = {
         ...this.draggingColumn,
-        left: mouseX - this.draggingOffset,
+        left: mouseX - this.draggingOffset - gridX,
       };
       grid.setState({ draggingColumn: this.draggingColumn });
       return;
@@ -410,8 +414,6 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
 
     const { model } = grid.props;
     const { movedColumns } = grid.state;
-    const { metrics } = grid;
-    if (!metrics) throw new Error('Metrics not set');
 
     const { floatingLeftWidth, width, columnHeaderMaxDepth, allColumnXs } =
       metrics;
@@ -431,7 +433,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
 
     // The returned left/right are the original position, not dragged position
     // This is where the dragging column's floating position accounting for dragged distance
-    const floatingDraggingLeft = mouseX - this.draggingOffset;
+    const floatingDraggingLeft = mouseX - this.draggingOffset - gridX;
     const floatingDraggingRight = floatingDraggingLeft + draggingColumn.width;
 
     this.draggingColumn = {
@@ -448,7 +450,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
           isDraggingLeft ? floatingDraggingLeft : floatingDraggingRight,
           floatingLeftWidth,
           width
-        ),
+        ) + gridX,
         metrics,
         true
       ),
@@ -481,7 +483,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
           mouseX - (allColumnXs.get(parentVisibleRange[0]) ?? 0);
         this.draggingColumn = {
           ...this.draggingColumn,
-          left: mouseX - this.draggingOffset,
+          left: mouseX - this.draggingOffset - gridX,
         };
         this.clearScrollInterval();
         grid.setState({
@@ -506,7 +508,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
         this.draggingOffset = mouseX - (parentRight - draggingColumn.width);
         this.draggingColumn = {
           ...this.draggingColumn,
-          left: mouseX - this.draggingOffset,
+          left: mouseX - this.draggingOffset - gridX,
         };
         this.clearScrollInterval();
         grid.setState({
@@ -570,7 +572,7 @@ class GridColumnMoveMouseHandler extends GridMouseHandler {
 
       this.draggingColumn = {
         ...this.draggingColumn,
-        left: mouseX - this.draggingOffset,
+        left: mouseX - this.draggingOffset - gridX,
       };
 
       grid.setState({

packages/grid/src/mouse-handlers/GridSeparatorMouseHandler.ts

@@ -174,12 +174,13 @@ abstract class GridSeparatorMouseHandler extends GridMouseHandler {
       const targetSize = this.targetSizes.get(modelIndex);
       const isResizingMultiple = this.resizingItems.length > 1;
       const hiddenIndex = this.hiddenItems.indexOf(resizeIndex);
-      let calculatedSize = getOrThrow(calculatedSizes, modelIndex);
-      if (resizeIndex === firstIndex) {
+      let calculatedSize = calculatedSizes.get(modelIndex);
+      if (calculatedSize != null && resizeIndex === firstIndex) {
         calculatedSize += treePadding;
       }
       let newSize = itemSize;
       if (
+        calculatedSize != null &&
         Math.abs(itemSize - calculatedSize) <= theme.headerResizeSnapThreshold
       ) {
         // Snapping behaviour to "natural" width
@@ -275,14 +276,12 @@ abstract class GridSeparatorMouseHandler extends GridMouseHandler {
       const modelIndexes = metrics[this.modelIndexesProperty];
       const modelIndex = getOrThrow(modelIndexes, separator.index);
 
-      const calculatedSize = getOrThrow(
-        metrics[this.calculatedSizesProperty],
-        modelIndex
-      );
+      const calculatedSize =
+        metrics[this.calculatedSizesProperty].get(modelIndex);
       const defaultSize =
         metricCalculator[this.initialSizesProperty].get(modelIndex);
 
-      if (calculatedSize === defaultSize) {
+      if (calculatedSize === defaultSize || calculatedSize == null) {
         this.resetSize(metricCalculator, modelIndex);
       } else {
         this.setSize(metricCalculator, modelIndex, calculatedSize);
@@ -314,7 +313,7 @@ abstract class GridSeparatorMouseHandler extends GridMouseHandler {
     const modelIndex = getOrThrow(modelIndexes, itemIndex);
     let targetSize = userSizes.get(modelIndex);
     if (targetSize == null || targetSize === 0) {
-      targetSize = getOrThrow(calculatedSizes, modelIndex) + treePadding;
+      targetSize = (calculatedSizes.get(modelIndex) ?? 0) + treePadding;
     }
     this.targetSizes.set(modelIndex, targetSize);
   }