Module java.desktop

Package javax.swing.event

Class TableModelEvent

java.lang.Object

java.util.EventObject

javax.swing.event.TableModelEvent

All Implemented Interfaces:

Serializable

public class TableModelEvent
extends EventObject

TableModelEvent is used to notify listeners that a table model has changed. The model event describes changes to a TableModel and all references to rows and columns are in the co-ordinate system of the model. Depending on the parameters used in the constructors, the TableModelevent can be used to specify the following types of changes:

 TableModelEvent(source);              //  The data, ie. all rows changed
 TableModelEvent(source, HEADER_ROW);  //  Structure change, reallocate TableColumns
 TableModelEvent(source, 1);           //  Row 1 changed
 TableModelEvent(source, 3, 6);        //  Rows 3 to 6 inclusive changed
 TableModelEvent(source, 2, 2, 6);     //  Cell at (2, 6) changed
 TableModelEvent(source, 3, 6, ALL_COLUMNS, INSERT); // Rows (3, 6) were inserted
 TableModelEvent(source, 3, 6, ALL_COLUMNS, DELETE); // Rows (3, 6) were deleted
 

It is possible to use other combinations of the parameters, not all of them are meaningful. By subclassing, you can add other information, for example: whether the event WILL happen or DID happen. This makes the specification of rows in DELETE events more useful but has not been included in the swing package as the JTable only needs post-event notification.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

• TableModel

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ALL_COLUMNS	Specifies all columns in a row or rows.
protected int	column	The column for the event.
static final int	DELETE	Identifies the removal of rows or columns.
protected int	firstRow	The first row that has changed.
static final int	HEADER_ROW	Identifies the header row.
static final int	INSERT	Identifies the addition of new rows or columns.
protected int	lastRow	The last row that has changed.
protected int	type	The type of the event.
static final int	UPDATE	Identifies a change to existing data.

Fields declared in class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
TableModelEvent(TableModel source)	All row data in the table has changed, listeners should discard any state that was based on the rows and requery the TableModel to get the new row count and all the appropriate values.
TableModelEvent(TableModel source, int row)	This row of data has been updated.
TableModelEvent(TableModel source, int firstRow, int lastRow)	The data in rows [firstRow, lastRow] have been updated.
TableModelEvent(TableModel source, int firstRow, int lastRow, int column)	The cells in column column in the range [firstRow, lastRow] have been updated.
TableModelEvent(TableModel source, int firstRow, int lastRow, int column, int type)	The cells from (firstRow, column) to (lastRow, column) have been changed.

Method Summary

Modifier and Type	Method	Description
int	getColumn()	Returns the column for the event.
int	getFirstRow()	Returns the first row that changed.
int	getLastRow()	Returns the last row that changed.
int	getType()	Returns the type of event - one of: INSERT, UPDATE and DELETE.

Methods declared in class java.util.EventObject

getSource, toString

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

INSERT

public static final int INSERT

Identifies the addition of new rows or columns.

See Also:

• Constant Field Values

UPDATE

public static final int UPDATE

Identifies a change to existing data.

See Also:

• Constant Field Values

DELETE

public static final int DELETE

Identifies the removal of rows or columns.

See Also:

• Constant Field Values

HEADER_ROW

public static final int HEADER_ROW

Identifies the header row.

See Also:

• Constant Field Values

ALL_COLUMNS

public static final int ALL_COLUMNS

Specifies all columns in a row or rows.

See Also:

• Constant Field Values

type

protected int type

The type of the event.

firstRow

protected int firstRow

The first row that has changed.

lastRow

protected int lastRow

The last row that has changed.

column

protected int column

The column for the event.

Constructor Details

TableModelEvent

public TableModelEvent(TableModel source)

All row data in the table has changed, listeners should discard any state that was based on the rows and requery the TableModel to get the new row count and all the appropriate values. The JTable will repaint the entire visible region on receiving this event, querying the model for the cell values that are visible. The structure of the table ie, the column names, types and order have not changed.

Parameters:

source - the TableModel affected by this event

TableModelEvent

public TableModelEvent(TableModel source,
 int row)

This row of data has been updated. To denote the arrival of a completely new table with a different structure use HEADER_ROW as the value for the row. When the JTable receives this event and its autoCreateColumnsFromModel flag is set it discards any TableColumns that it had and reallocates default ones in the order they appear in the model. This is the same as calling setModel(TableModel) on the JTable.

Parameters:

source - the TableModel affected by this event

row - the row which has been updated

TableModelEvent

public TableModelEvent(TableModel source,
 int firstRow,
 int lastRow)

The data in rows [firstRow, lastRow] have been updated.

Parameters:

source - the TableModel affected by this event

firstRow - the first row affected by this event

lastRow - the last row affected by this event

TableModelEvent

public TableModelEvent(TableModel source,
 int firstRow,
 int lastRow,
 int column)

The cells in column column in the range [firstRow, lastRow] have been updated.

Parameters:

source - the TableModel affected by this event

firstRow - the first row affected by this event

lastRow - the last row affected by this event

column - the column index of cells changed; ALL_COLUMNS signifies all cells in the specified range of rows are changed.

TableModelEvent

public TableModelEvent(TableModel source,
 int firstRow,
 int lastRow,
 int column,
 int type)

The cells from (firstRow, column) to (lastRow, column) have been changed. The column refers to the column index of the cell in the model's co-ordinate system. When column is ALL_COLUMNS, all cells in the specified range of rows are considered changed.

The type should be one of: INSERT, UPDATE and DELETE.

Parameters:

source - the TableModel affected by this event

firstRow - the first row affected by this event

lastRow - the last row affected by this event

column - the column index of cells changed; ALL_COLUMNS signifies all cells in the specified range of rows are changed.

type - the type of change signified by this even, INSERT, DELETE or UPDATE

Method Details

getFirstRow

public int getFirstRow()

Returns the first row that changed. HEADER_ROW means the meta data, ie. names, types and order of the columns.

Returns:

an integer signifying the first row changed

getLastRow

public int getLastRow()

Returns the last row that changed.

Returns:

an integer signifying the last row changed

getColumn

public int getColumn()

Returns the column for the event. If the return value is ALL_COLUMNS; it means every column in the specified rows changed.

Returns:

an integer signifying which column is affected by this event

getType

public int getType()

Returns the type of event - one of: INSERT, UPDATE and DELETE.

Returns:

the type of change to a table model, an INSERT or DELETE of row(s) or column(s) or UPDATE to data