[two_dimensional_scrollables] Fix TableSpanDecoration rects when axes are reversed (flutter#5916)

Fixes flutter/flutter#141704

This fixes the rect computation for TableSpanDecorations when one or both axes are reversed.
We previously fixed similar issues when the clipRects applied to areas of the table did not account for reversed. This is another similar case.
- flutter#5187
- flutter#5038

![image](https://github.com/flutter/packages/assets/16964204/ae7c6872-c740-4617-95a4-8302a3085d59)

Author: Piinks

packages/two_dimensional_scrollables/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.6
+
+* Fixes an error in TableSpanDecoration when one or both axes are reversed.
+
 ## 0.0.5+2
 
 * Fixes must_call_super lint warning from pending framework change.

packages/two_dimensional_scrollables/lib/src/table_view/table.dart

@@ -861,31 +861,41 @@ class RenderTableViewport extends RenderTwoDimensionalViewport {
         )!;
 
         Rect getColumnRect(bool consumePadding) {
+          final ({double leading, double trailing}) offsetCorrection =
+              axisDirectionIsReversed(verticalAxisDirection)
+                  ? (
+                      leading: leadingCell.size.height,
+                      trailing: trailingCell.size.height,
+                    )
+                  : (leading: 0.0, trailing: 0.0);
+
           return Rect.fromPoints(
             parentDataOf(leadingCell).paintOffset! +
                 offset -
                 Offset(
                   consumePadding ? columnSpan.padding.leading : 0.0,
-                  rowSpan.padding.leading,
+                  rowSpan.padding.leading - offsetCorrection.leading,
                 ),
             parentDataOf(trailingCell).paintOffset! +
                 offset +
                 Offset(trailingCell.size.width, trailingCell.size.height) +
                 Offset(
                   consumePadding ? columnSpan.padding.trailing : 0.0,
-                  rowSpan.padding.trailing,
+                  rowSpan.padding.trailing - offsetCorrection.trailing,
                 ),
           );
         }
 
         if (columnSpan.backgroundDecoration != null) {
           final Rect rect = getColumnRect(
-              columnSpan.backgroundDecoration!.consumeSpanPadding);
+            columnSpan.backgroundDecoration!.consumeSpanPadding,
+          );
           backgroundColumns[rect] = columnSpan.backgroundDecoration!;
         }
         if (columnSpan.foregroundDecoration != null) {
           final Rect rect = getColumnRect(
-              columnSpan.foregroundDecoration!.consumeSpanPadding);
+            columnSpan.foregroundDecoration!.consumeSpanPadding,
+          );
           foregroundColumns[rect] = columnSpan.foregroundDecoration!;
         }
       }
@@ -910,18 +920,25 @@ class RenderTableViewport extends RenderTwoDimensionalViewport {
         )!;
 
         Rect getRowRect(bool consumePadding) {
+          final ({double leading, double trailing}) offsetCorrection =
+              axisDirectionIsReversed(horizontalAxisDirection)
+                  ? (
+                      leading: leadingCell.size.width,
+                      trailing: trailingCell.size.width,
+                    )
+                  : (leading: 0.0, trailing: 0.0);
           return Rect.fromPoints(
             parentDataOf(leadingCell).paintOffset! +
                 offset -
                 Offset(
-                  columnSpan.padding.leading,
+                  columnSpan.padding.leading - offsetCorrection.leading,
                   consumePadding ? rowSpan.padding.leading : 0.0,
                 ),
             parentDataOf(trailingCell).paintOffset! +
                 offset +
                 Offset(trailingCell.size.width, trailingCell.size.height) +
                 Offset(
-                  columnSpan.padding.leading,
+                  columnSpan.padding.leading - offsetCorrection.trailing,
                   consumePadding ? rowSpan.padding.trailing : 0.0,
                 ),
           );

packages/two_dimensional_scrollables/pubspec.yaml

@@ -1,6 +1,6 @@
 name: two_dimensional_scrollables
 description: Widgets that scroll using the two dimensional scrolling foundation.
-version: 0.0.5+2
+version: 0.0.6
 repository: https://github.com/flutter/packages/tree/main/packages/two_dimensional_scrollables
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+two_dimensional_scrollables%22+