javax.swing.table
Class TableColumn

java.lang.Object
  javax.swing.table.TableColumn

All Implemented Interfaces:

java.io.Serializable

public class TableColumn

extends java.lang.Object

implements java.io.Serializable

A TableColumn represents all the attributes of a column in a JTable, such as width, resizibility, minimum and maximum width. In addition, the TableColumn provides slots for a renderer and an editor that can be used to display and edit the values in this column.

It is also possible to specify renderers and editors on a per type basis rather than a per column basis - see the setDefaultRenderer method in the JTable class. This default mechanism is only used when the renderer (or editor) in the TableColumn is null.

The TableColumn stores the link between the columns in the JTable and the columns in the TableModel. The modelIndex is the column in the TableModel, which will be queried for the data values for the cells in this column. As the column moves around in the view this modelIndex does not change.

Note: Some implementations may assume that all TableColumnModels are unique, therefore we would recommend that the same TableColumn instance not be added more than once to a TableColumnModel. To show TableColumns with the same column of data from the model, create a new instance with the same modelIndex.

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^TM has been added to the java.beans package. Please see java.beans.XMLEncoder.

See Also:

TableColumnModel, DefaultTableColumnModel, JTableHeader.getDefaultRenderer(), JTable.getDefaultRenderer(Class), JTable#getDefaultEditor(Class), JTable.getCellRenderer(int, int), JTable#getCellEditor(int, int)

Field Summary

protected TableCellRenderer	cellRenderer The renderer used to draw the data cells of the column.
protected TableCellRenderer	headerRenderer The renderer used to draw the header of the column.
protected java.lang.Object	headerValue The header value of the column.
protected java.lang.Object	identifier This object is not used internally by the drawing machinery of the JTable; identifiers may be set in the TableColumn as as an optional way to tag and locate table columns.
protected boolean	isResizable If true, the user is allowed to resize the column; the default is true.
protected int	maxWidth The maximum width of the column.
protected int	minWidth The minimum width of the column.
protected int	modelIndex The index of the column in the model which is to be displayed by this TableColumn.
protected int	width The width of the column.

Constructor Summary

TableColumn()
Cover method, using a default model index of 0, default width of 75, a null renderer and a null editor.

TableColumn(int modelIndex)
Cover method, using a default width of 75, a null renderer and a null editor.

TableColumn(int modelIndex, int width)
Cover method, using a null renderer and a null editor.

Method Summary

void	addPropertyChangeListener(java.beans.PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list.
protected TableCellRenderer	createDefaultHeaderRenderer() As of Java 2 platform v1.3, this method is not called by the TableColumn constructor.
TableCellRenderer	getCellRenderer() Returns the TableCellRenderer used by the JTable to draw values for this column.
TableCellRenderer	getHeaderRenderer() Returns the TableCellRenderer used to draw the header of the TableColumn.
java.lang.Object	getHeaderValue() Returns the Object used as the value for the header renderer.
java.lang.Object	getIdentifier() Returns the identifier object for this column.
int	getMaxWidth() Returns the maximum width for the TableColumn.
int	getMinWidth() Returns the minimum width for the TableColumn.
int	getModelIndex() Returns the model index for this column.
int	getPreferredWidth() Returns the preferred width of the TableColumn.
java.beans.PropertyChangeListener[]	getPropertyChangeListeners() Returns an array of all the PropertyChangeListeners added to this TableColumn with addPropertyChangeListener().
boolean	getResizable() Returns true if the user is allowed to resize the TableColumn's width, false otherwise.
int	getWidth() Returns the width of the TableColumn.
void	removePropertyChangeListener(java.beans.PropertyChangeListener listener) Removes a PropertyChangeListener from the listener list.
void	setCellRenderer(TableCellRenderer cellRenderer) Sets the TableCellRenderer used by JTable to draw individual values for this column.
void	setHeaderRenderer(TableCellRenderer headerRenderer) Sets the TableCellRenderer used to draw the TableColumn's header to headerRenderer.
void	setHeaderValue(java.lang.Object headerValue) Sets the Object whose string representation will be used as the value for the headerRenderer.
void	setIdentifier(java.lang.Object identifier) Sets the TableColumn's identifier to anIdentifier.
void	setMaxWidth(int maxWidth) Sets the TableColumn's maximum width to maxWidth; also adjusts the width and preferred width if they are greater than this value.
void	setMinWidth(int minWidth) Sets the TableColumn's minimum width to minWidth; also adjusts the current width and preferred width if they are less than this value.
void	setModelIndex(int modelIndex) Sets the model index for this column.
void	setPreferredWidth(int preferredWidth) Sets this column's preferred width to preferredWidth.
void	setResizable(boolean isResizable) Sets whether this column can be resized.
void	setWidth(int width) This method should not be used to set the widths of columns in the JTable, use setPreferredWidth instead.
void	sizeWidthToFit() Resizes the TableColumn to fit the width of its header cell.

Methods inherited from class java.lang.Object

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

Field Detail

modelIndex

protected int modelIndex

The index of the column in the model which is to be displayed by this TableColumn. As columns are moved around in the view modelIndex remains constant.

identifier

protected java.lang.Object identifier

This object is not used internally by the drawing machinery of the JTable; identifiers may be set in the TableColumn as as an optional way to tag and locate table columns. The table package does not modify or invoke any methods in these identifier objects other than the equals method which is used in the getColumnIndex() method in the DefaultTableColumnModel.

width

protected int width

The width of the column.

minWidth

protected int minWidth

The minimum width of the column.

maxWidth

protected int maxWidth

The maximum width of the column.

headerRenderer

protected TableCellRenderer headerRenderer

The renderer used to draw the header of the column.

headerValue

protected java.lang.Object headerValue

The header value of the column.

cellRenderer

protected TableCellRenderer cellRenderer

The renderer used to draw the data cells of the column.

isResizable

protected boolean isResizable

If true, the user is allowed to resize the column; the default is true.

Constructor Detail

TableColumn

public TableColumn()

Cover method, using a default model index of 0, default width of 75, a null renderer and a null editor. This method is intended for serialization.

See Also:

#TableColumn(int, int, TableCellRenderer, TableCellEditor)

TableColumn

public TableColumn(int modelIndex)

Cover method, using a default width of 75, a null renderer and a null editor.

See Also:

#TableColumn(int, int, TableCellRenderer, TableCellEditor)

TableColumn

public TableColumn(int modelIndex,
                   int width)

Cover method, using a null renderer and a null editor.

See Also:

#TableColumn(int, int, TableCellRenderer, TableCellEditor)

Method Detail

setModelIndex

public void setModelIndex(int modelIndex)

Sets the model index for this column. The model index is the index of the column in the model that will be displayed by this TableColumn. As the TableColumn is moved around in the view the model index remains constant.

Parameters:

modelIndex - the new modelIndex

getModelIndex

public int getModelIndex()

Returns the model index for this column.

Returns:

the modelIndex property

setIdentifier

public void setIdentifier(java.lang.Object identifier)

Sets the TableColumn's identifier to anIdentifier.

Note: identifiers are not used by the JTable, they are purely a convenience for the external tagging and location of columns.

Parameters:

identifier - an identifier for this column

See Also:

getIdentifier()

getIdentifier

public java.lang.Object getIdentifier()

Returns the identifier object for this column. Note identifiers are not used by JTable, they are purely a convenience for external use. If the identifier is null, getIdentifier() returns getHeaderValue as a default.

Returns:

the identifier property

See Also:

setIdentifier(java.lang.Object)

setHeaderValue

public void setHeaderValue(java.lang.Object headerValue)

Sets the Object whose string representation will be used as the value for the headerRenderer. When the TableColumn is created, the default headerValue is null.

Parameters:

headerValue - the new headerValue

See Also:

getHeaderValue()

getHeaderValue

public java.lang.Object getHeaderValue()

Returns the Object used as the value for the header renderer.

Returns:

the headerValue property

See Also:

setHeaderValue(java.lang.Object)

setHeaderRenderer

public void setHeaderRenderer(TableCellRenderer headerRenderer)

Sets the TableCellRenderer used to draw the TableColumn's header to headerRenderer.

Parameters:

headerRenderer - the new headerRenderer

See Also:

getHeaderRenderer()

getHeaderRenderer

public TableCellRenderer getHeaderRenderer()

Returns the TableCellRenderer used to draw the header of the TableColumn. When the headerRenderer is null, the JTableHeader uses its defaultRenderer. The default value for a headerRenderer is null.

Returns:

the headerRenderer property

See Also:

setHeaderRenderer(javax.swing.table.TableCellRenderer), setHeaderValue(java.lang.Object), JTableHeader.getDefaultRenderer()

setCellRenderer

public void setCellRenderer(TableCellRenderer cellRenderer)

Sets the TableCellRenderer used by JTable to draw individual values for this column.

Parameters:

cellRenderer - the new cellRenderer

See Also:

getCellRenderer()

getCellRenderer

public TableCellRenderer getCellRenderer()

Returns the TableCellRenderer used by the JTable to draw values for this column. The cellRenderer of the column not only controls the visual look for the column, but is also used to interpret the value object supplied by the TableModel. When the cellRenderer is null, the JTable uses a default renderer based on the class of the cells in that column. The default value for a cellRenderer is null.

Returns:

the cellRenderer property

See Also:

setCellRenderer(javax.swing.table.TableCellRenderer), JTable.setDefaultRenderer(java.lang.Class, javax.swing.table.TableCellRenderer)

setWidth

public void setWidth(int width)

This method should not be used to set the widths of columns in the JTable, use setPreferredWidth instead. Like a layout manager in the AWT, the JTable adjusts a column's width automatically whenever the table itself changes size, or a column's preferred width is changed. Setting widths programmatically therefore has no long term effect.

This method sets this column's width to width. If width exceeds the minimum or maximum width, it is adjusted to the appropriate limiting value.

Parameters:

width - the new width

See Also:

getWidth(), setMinWidth(int), setMaxWidth(int), setPreferredWidth(int), JTable#sizeColumnsToFit(int)

getWidth

public int getWidth()

Returns the width of the TableColumn. The default width is 75.

Returns:

the width property

See Also:

setWidth(int)

setPreferredWidth

public void setPreferredWidth(int preferredWidth)

Sets this column's preferred width to preferredWidth. If preferredWidth exceeds the minimum or maximum width, it is adjusted to the appropriate limiting value.

For details on how the widths of columns in the JTable (and JTableHeader) are calculated from the preferredWidth, see the sizeColumnsToFit method in JTable.

Parameters:

preferredWidth - the new preferred width

See Also:

getPreferredWidth(), JTable#sizeColumnsToFit(int)

getPreferredWidth

public int getPreferredWidth()

Returns the preferred width of the TableColumn. The default preferred width is 75.

Returns:

the preferredWidth property

See Also:

setPreferredWidth(int)

setMinWidth

public void setMinWidth(int minWidth)

Sets the TableColumn's minimum width to minWidth; also adjusts the current width and preferred width if they are less than this value.

Parameters:

minWidth - the new minimum width

See Also:

getMinWidth(), setPreferredWidth(int), setMaxWidth(int)

getMinWidth

public int getMinWidth()

Returns the minimum width for the TableColumn. The TableColumn's width can't be made less than this either by the user or programmatically. The default minWidth is 15.

Returns:

the minWidth property

See Also:

setMinWidth(int)

setMaxWidth

public void setMaxWidth(int maxWidth)

Sets the TableColumn's maximum width to maxWidth; also adjusts the width and preferred width if they are greater than this value.

Parameters:

maxWidth - the new maximum width

See Also:

getMaxWidth(), setPreferredWidth(int), setMinWidth(int)

getMaxWidth

public int getMaxWidth()

Returns the maximum width for the TableColumn. The TableColumn's width can't be made larger than this either by the user or programmatically. The default maxWidth is Integer.MAX_VALUE.

Returns:

the maxWidth property

See Also:

setMaxWidth(int)

setResizable

public void setResizable(boolean isResizable)

Sets whether this column can be resized.

Parameters:

isResizable - if true, resizing is allowed; otherwise false

See Also:

getResizable()

getResizable

public boolean getResizable()

Returns true if the user is allowed to resize the TableColumn's width, false otherwise. You can change the width programmatically regardless of this setting. The default is true.

Returns:

the isResizable property

See Also:

setResizable(boolean)

sizeWidthToFit

public void sizeWidthToFit()

Resizes the TableColumn to fit the width of its header cell. This method does nothing if the header renderer is null (the default case). Otherwise, it sets the minimum, maximum and preferred widths of this column to the widths of the minimum, maximum and preferred sizes of the Component delivered by the header renderer. The transient "width" property of this TableColumn is also set to the preferred width. Note this method is not used internally by the table package.

See Also:

setPreferredWidth(int)

addPropertyChangeListener

public void addPropertyChangeListener(java.beans.PropertyChangeListener listener)

Adds a PropertyChangeListener to the listener list. The listener is registered for all properties.

A PropertyChangeEvent will get fired in response to an explicit call to setFont, setBackground, or setForeground on the current component. Note that if the current component is inheriting its foreground, background, or font from its container, then no event will be fired in response to a change in the inherited property.

Parameters:

listener - the listener to be added

removePropertyChangeListener

public void removePropertyChangeListener(java.beans.PropertyChangeListener listener)

Removes a PropertyChangeListener from the listener list. The PropertyChangeListener to be removed was registered for all properties.

Parameters:

listener - the listener to be removed

getPropertyChangeListeners

public java.beans.PropertyChangeListener[] getPropertyChangeListeners()

Returns an array of all the PropertyChangeListeners added to this TableColumn with addPropertyChangeListener().

Returns:

all of the PropertyChangeListeners added or an empty array if no listeners have been added

Since:

1.4

createDefaultHeaderRenderer

protected TableCellRenderer createDefaultHeaderRenderer()

As of Java 2 platform v1.3, this method is not called by the TableColumn constructor. Previously this method was used by the TableColumn to create a default header renderer. As of Java 2 platform v1.3, the default header renderer is null. JTableHeader now provides its own shared default renderer, just as the JTable does for its cell renderers.

Returns:

the default header renderer

See Also:

JTableHeader.createDefaultRenderer()