DataTableSource class abstract

A data source for obtaining row data for PaginatedDataTable objects.

A data table source provides two main pieces of information:

  • The number of rows in the data table (rowCount).
  • The data for each row (indexed from 0 to rowCount - 1).

It also provides a listener API (addListener/removeListener) so that consumers of the data can be notified when it changes. When the data changes, call notifyListeners to send the notifications.

DataTableSource objects are expected to be long-lived, not recreated with each build.

If a DataTableSource is used with a PaginatedDataTable that supports sortable columns (see DataColumn.onSort and PaginatedDataTable.sortColumnIndex), the rows reported by the data source must be reported in the sorted order.

Inheritance

Constructors

DataTableSource()

Properties

hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
isRowCountApproximate → bool
Called to establish if rowCount is a precise number or might be an over-estimate. If this returns true (i.e. the count is approximate), and then later the exact number becomes available, then call notifyListeners.
no setter
rowCount → int
Called to obtain the number of rows to tell the user are available.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectedRowCount → int
Called to obtain the number of rows that are currently selected.
no setter

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
inherited
getRow(int index) → DataRow?
Called to obtain the data about a particular row.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited