cleanup code

lib/pages/widgets/my_data_table.dart

@@ -1,9 +1,9 @@
+// ignore_for_file: unnecessary_null_comparison, dead_code
+
 import 'dart:math' as math;
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/widgets.dart';
 
 /// Signature for [MyDataColumn.onSort] callback.
 typedef MyDataColumnSortCallback = void Function(
@@ -13,7 +13,7 @@ typedef MyDataColumnSortCallback = void Function(
 ///
 /// One column configuration must be provided for each column to
 /// display in the table. The list of [MyDataColumn] objects is passed
-/// as the `columns` argument to the [new MyDataTable] constructor.
+/// as the `columns` argument to the [MyDataTable.new] constructor.
 @immutable
 class MyDataColumn {
   /// Creates the configuration for a column of a [MyDataTable].
@@ -62,7 +62,7 @@ class MyDataColumn {
 ///
 /// One row configuration must be provided for each row to
 /// display in the table. The list of [MyDataRow] objects is passed
-/// as the `rows` argument to the [new MyDataTable] constructor.
+/// as the `rows` argument to the [MyDataTable.new] constructor.
 ///
 /// The data for this row of the table is provided in the [cells]
 /// property of the [MyDataRow] object.
@@ -137,7 +137,7 @@ class MyDataRow {
 /// The data for a cell of a [MyDataTable].
 ///
 /// One list of [MyDataCell] objects must be provided for each [MyDataRow]
-/// in the [MyDataTable], in the [new MyDataRow] constructor's `cells`
+/// in the [MyDataTable], in the [MyDataRow.new] constructor's `cells`
 /// argument.
 @immutable
 class MyDataCell {
@@ -314,19 +314,18 @@ class MyDataTable extends StatelessWidget {
     this.sortColumnIndex,
     this.sortAscending = true,
     this.onSelectAll,
-    this.MyDataRowHeight = kMinInteractiveDimension,
+    this.myDataRowHeight = kMinInteractiveDimension,
     this.headingRowHeight = 56.0,
     this.horizontalMargin = 24.0,
     this.columnSpacing = 56.0,
     this.oddLine,
     this.evenLine,
     required this.rows,
-  })  : assert(columns != null),
-        assert(columns.isNotEmpty),
+  })  : assert(columns.isNotEmpty),
         assert(sortColumnIndex == null ||
             (sortColumnIndex >= 0 && sortColumnIndex < columns.length)),
         assert(sortAscending != null),
-        assert(MyDataRowHeight != null),
+        assert(myDataRowHeight != null),
         assert(headingRowHeight != null),
         assert(horizontalMargin != null),
         assert(columnSpacing != null),
@@ -382,7 +381,7 @@ class MyDataTable extends StatelessWidget {
   ///
   /// This value defaults to kMinInteractiveDimension to adhere to the Material
   /// Design specifications.
-  final double MyDataRowHeight;
+  final double myDataRowHeight;
 
   /// The height of the heading row.
   ///
@@ -567,7 +566,7 @@ class MyDataTable extends StatelessWidget {
     }
     label = Container(
       padding: padding,
-      height: MyDataRowHeight,
+      height: myDataRowHeight,
       alignment: (numeric ?? false)
           ? Alignment.centerRight
           : AlignmentDirectional.centerStart,
@@ -605,7 +604,6 @@ class MyDataTable extends StatelessWidget {
   Widget build(BuildContext context) {
     assert(!_debugInteractive || debugCheckHasMaterial(context));
 
-    final ThemeData theme = Theme.of(context);
     final BoxDecoration _kSelectedDecoration = BoxDecoration(
       border: Border(bottom: Divider.createBorderSide(context, width: 1.0)),
       // The backgroundColor has to be transparent so you can see the ink on the material
@@ -618,7 +616,6 @@ class MyDataTable extends StatelessWidget {
     );
 
     final bool showCheckboxColumn = false;
-    final bool allChecked = false;
 
     final List<TableColumnWidth> tableColumns = (columns.length +
         (showCheckboxColumn ? 1 : 0)) as List<TableColumnWidth>;
@@ -641,7 +638,7 @@ class MyDataTable extends StatelessWidget {
 
     int rowIndex;
 
-    int displayColumnIndex = 0;   
+    int displayColumnIndex = 0;
     // if (showCheckboxColumn) {
     //   tableColumns[0] = FixedColumnWidth(
     //       horizontalMargin + Checkbox.width + horizontalMargin / 2.0);
@@ -696,7 +693,7 @@ class MyDataTable extends StatelessWidget {
       } else {
         tableColumns[displayColumnIndex] = const IntrinsicColumnWidth();
       }
-      tableRows[0].children![displayColumnIndex] = _buildHeadingCell(
+      tableRows[0].children[displayColumnIndex] = _buildHeadingCell(
         context: context,
         padding: padding,
         label: column.label,
@@ -712,7 +709,7 @@ class MyDataTable extends StatelessWidget {
       rowIndex = 1;
       for (MyDataRow row in rows) {
         final MyDataCell cell = row.cells[MyDataColumnIndex];
-        tableRows[rowIndex].children?[displayColumnIndex] = _buildMyDataCell(
+        tableRows[rowIndex].children[displayColumnIndex] = _buildMyDataCell(
           context: context,
           padding: padding,
           label: cell.child,
@@ -780,13 +777,13 @@ class TableRowInkWell extends InkResponse {
         parentBox.applyPaintTransform(cell, transform);
         assert(table == cell.parent);
         cell = parentBox;
-        table = table?.parent;
+        table = table.parent;
       }
       if (table is RenderTable) {
         final TableCellParentData cellParentData =
             cell.parentData as TableCellParentData;
         assert(cellParentData.y != null);
-        final Rect rect = table .getRowBox(cellParentData.y!);
+        final Rect rect = table.getRowBox(cellParentData.y!);
         // The rect is in the table's coordinate space. We need to change it to the
         // TableRowInkWell's coordinate space.
         table.applyPaintTransform(cell, transform);