TableCellHelper class

A helper class for TableCell, and is used to decide which TableCell to fill the whole TableRow in vertical direction, which is not implemented by flutter.

Example:

// in State class
final _helper = TableCellHelper(9, 2); // 9x2

// 1. in initState and didUpdateWidget method
// 2. or in build method
// 3. or use StatefulWidgetWithCallback with postFrameCallbackForXXX
WidgetsBinding.instance!.addPostFrameCallback((_) {
  if (_helper.searchForHighestCells()) {
    if (mounted) setState(() {});
  }
});

// Table constructor in build method
Table(
  children: [
    for (int i = 0; i < 9; i++)
      TableRow(
        children: [
          for (int j = 0; j < 2; j++)
            TableCell(
              key: _helper.getCellKey(i, j)
              verticalAlignment: _helper.determineCellAlignment(i, j, TableCellVerticalAlignment.top),
              child: Text('item ($i, $j)'),
            ),
        ],
      ),
  ],
)

// for update Table content
_helper.reset(newRow, newHeight);
if (mounted) setState(() {});

Constructors

TableCellHelper(int _rows, int _columns)

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

determineCellAlignment(int i, int j, [TableCellVerticalAlignment? initialValue]) → TableCellVerticalAlignment?

Determines the TableCell's TableCellVerticalAlignment with given index.

getCellKey(int i, int j) → GlobalKey<State<StatefulWidget>>

Returns the TableCell's GlobalKey for given index.

hasSearched() → bool

Returns true if searchForHighestCells has already been invoked to search.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

reset(int rows, int columns) → void

Resets the TableCellHelper with new rows and columns, which should be used when TableRow count or TableCell content was changed, following setState.

searchForHighestCells() → bool

Searches the highest TableCell in multiple TableRow and this function returns true if the highests list is regenerated.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited