Java™ Platform
Standard Ed. 6

javax.swing.table
Class JTableHeader

java.lang.Object
  extended by java.awt.Component
      extended by java.awt.Container
          extended by javax.swing.JComponent
              extended by javax.swing.table.JTableHeader
All Implemented Interfaces:
ImageObserver, MenuContainer, Serializable, EventListener, Accessible, TableColumnModelListener

public class JTableHeader
extends JComponent
implements TableColumnModelListener, Accessible

This is the object which manages the header of the JTable.

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

See Also:
JTable

Nested Class Summary
protected  class JTableHeader.AccessibleJTableHeader
          This class implements accessibility support for the JTableHeader class.
 
Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent
 
Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer
 
Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
 
Field Summary
protected  TableColumnModel columnModel
          The TableColumnModel of the table header.
protected  TableColumn draggedColumn
          The index of the column being dragged.
protected  int draggedDistance
          The distance from its original position the column has been dragged.
protected  boolean reorderingAllowed
          If true, reordering of columns are allowed by the user; the default is true.
protected  boolean resizingAllowed
          If true, resizing of columns are allowed by the user; the default is true.
protected  TableColumn resizingColumn
          The index of the column being resized.
protected  JTable table
          The table for which this object is the header; the default is null.
protected  boolean updateTableInRealTime
          Obsolete as of Java 2 platform v1.3.
 
Fields inherited from class javax.swing.JComponent
accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
 
Fields inherited from class java.awt.Component
BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
 
Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
 
Constructor Summary
JTableHeader()
          Constructs a JTableHeader with a default TableColumnModel.
JTableHeader(TableColumnModel cm)
          Constructs a JTableHeader which is initialized with cm as the column model.
 
Method Summary
 void columnAdded(TableColumnModelEvent e)
          Invoked when a column is added to the table column model.
 int columnAtPoint(Point point)
          Returns the index of the column that point lies in, or -1 if it lies out of bounds.
 void columnMarginChanged(ChangeEvent e)
          Invoked when a column is moved due to a margin change.
 void columnMoved(TableColumnModelEvent e)
          Invoked when a column is repositioned.
 void columnRemoved(TableColumnModelEvent e)
          Invoked when a column is removed from the table column model.
 void columnSelectionChanged(ListSelectionEvent e)
          Invoked when the selection model of the TableColumnModel is changed.
protected  TableColumnModel createDefaultColumnModel()
          Returns the default column model object which is a DefaultTableColumnModel.
protected  TableCellRenderer createDefaultRenderer()
          Returns a default renderer to be used when no header renderer is defined by a TableColumn.
 AccessibleContext getAccessibleContext()
          Gets the AccessibleContext associated with this JTableHeader.
 TableColumnModel getColumnModel()
          Returns the TableColumnModel that contains all column information of this table header.
 TableCellRenderer getDefaultRenderer()
          Returns the default renderer used when no headerRenderer is defined by a TableColumn.
 TableColumn getDraggedColumn()
          Returns the the dragged column, if and only if, a drag is in process, otherwise returns null.
 int getDraggedDistance()
          Returns the column's horizontal distance from its original position, if and only if, a drag is in process.
 Rectangle getHeaderRect(int column)
          Returns the rectangle containing the header tile at column.
 boolean getReorderingAllowed()
          Returns true if the user is allowed to rearrange columns by dragging their headers, false otherwise.
 boolean getResizingAllowed()
          Returns true if the user is allowed to resize columns by dragging between their headers, false otherwise.
 TableColumn getResizingColumn()
          Returns the resizing column.
 JTable getTable()
          Returns the table associated with this header.
 String getToolTipText(MouseEvent event)
          Allows the renderer's tips to be used if there is text set.
 TableHeaderUI getUI()
          Returns the look and feel (L&F) object that renders this component.
 String getUIClassID()
          Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.
 boolean getUpdateTableInRealTime()
          Obsolete as of Java 2 platform v1.3.
protected  void initializeLocalVars()
          Initializes the local variables and properties with default values.
protected  String paramString()
          Returns a string representation of this JTableHeader.
 void resizeAndRepaint()
          Sizes the header and marks it as needing display.
 void setColumnModel(TableColumnModel columnModel)
          Sets the column model for this table to newModel and registers for listener notifications from the new column model.
 void setDefaultRenderer(TableCellRenderer defaultRenderer)
          Sets the default renderer to be used when no headerRenderer is defined by a TableColumn.
 void setDraggedColumn(TableColumn aColumn)
          Sets the header's draggedColumn to aColumn.
 void setDraggedDistance(int distance)
          Sets the header's draggedDistance to distance.
 void setReorderingAllowed(boolean reorderingAllowed)
          Sets whether the user can drag column headers to reorder columns.
 void setResizingAllowed(boolean resizingAllowed)
          Sets whether the user can resize columns by dragging between headers.
 void setResizingColumn(TableColumn aColumn)
          Sets the header's resizingColumn to aColumn.
 void setTable(JTable table)
          Sets the table associated with this header.
 void setUI(TableHeaderUI ui)
          Sets the look and feel (L&F) object that renders this component.
 void setUpdateTableInRealTime(boolean flag)
          Obsolete as of Java 2 platform v1.3.
 void updateUI()
          Notification from the UIManager that the look and feel (L&F) has changed.
 
Methods inherited from class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update
 
Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree
 
Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

table

protected JTable table
The table for which this object is the header; the default is null.


columnModel

protected TableColumnModel columnModel
The TableColumnModel of the table header.


reorderingAllowed

protected boolean reorderingAllowed
If true, reordering of columns are allowed by the user; the default is true.


resizingAllowed

protected boolean resizingAllowed
If true, resizing of columns are allowed by the user; the default is true.


updateTableInRealTime

protected boolean updateTableInRealTime
Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.


resizingColumn

protected transient TableColumn resizingColumn
The index of the column being resized. null if not resizing.


draggedColumn

protected transient TableColumn draggedColumn
The index of the column being dragged. null if not dragging.


draggedDistance

protected transient int draggedDistance
The distance from its original position the column has been dragged.

Constructor Detail

JTableHeader

public JTableHeader()
Constructs a JTableHeader with a default TableColumnModel.

See Also:
createDefaultColumnModel()

JTableHeader

public JTableHeader(TableColumnModel cm)
Constructs a JTableHeader which is initialized with cm as the column model. If cm is null this method will initialize the table header with a default TableColumnModel.

Parameters:
cm - the column model for the table
See Also:
createDefaultColumnModel()
Method Detail

setTable

public void setTable(JTable table)
Sets the table associated with this header.

Parameters:
table - the new table

getTable

public JTable getTable()
Returns the table associated with this header.

Returns:
the table property

setReorderingAllowed

public void setReorderingAllowed(boolean reorderingAllowed)
Sets whether the user can drag column headers to reorder columns.

Parameters:
reorderingAllowed - true if the table view should allow reordering; otherwise false
See Also:
getReorderingAllowed()

getReorderingAllowed

public boolean getReorderingAllowed()
Returns true if the user is allowed to rearrange columns by dragging their headers, false otherwise. The default is true. You can rearrange columns programmatically regardless of this setting.

Returns:
the reorderingAllowed property
See Also:
setReorderingAllowed(boolean)

setResizingAllowed

public void setResizingAllowed(boolean resizingAllowed)
Sets whether the user can resize columns by dragging between headers.

Parameters:
resizingAllowed - true if table view should allow resizing
See Also:
getResizingAllowed()

getResizingAllowed

public boolean getResizingAllowed()
Returns true if the user is allowed to resize columns by dragging between their headers, false otherwise. The default is true. You can resize columns programmatically regardless of this setting.

Returns:
the resizingAllowed property
See Also:
setResizingAllowed(boolean)

getDraggedColumn

public TableColumn getDraggedColumn()
Returns the the dragged column, if and only if, a drag is in process, otherwise returns null.

Returns:
the dragged column, if a drag is in process, otherwise returns null
See Also:
getDraggedDistance()

getDraggedDistance

public int getDraggedDistance()
Returns the column's horizontal distance from its original position, if and only if, a drag is in process. Otherwise, the the return value is meaningless.

Returns:
the column's horizontal distance from its original position, if a drag is in process, otherwise the return value is meaningless
See Also:
getDraggedColumn()

getResizingColumn

public TableColumn getResizingColumn()
Returns the resizing column. If no column is being resized this method returns null.

Returns:
the resizing column, if a resize is in process, otherwise returns null

setUpdateTableInRealTime

public void setUpdateTableInRealTime(boolean flag)
Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.


getUpdateTableInRealTime

public boolean getUpdateTableInRealTime()
Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.


setDefaultRenderer

public void setDefaultRenderer(TableCellRenderer defaultRenderer)
Sets the default renderer to be used when no headerRenderer is defined by a TableColumn.

Parameters:
defaultRenderer - the default renderer
Since:
1.3

getDefaultRenderer

public TableCellRenderer getDefaultRenderer()
Returns the default renderer used when no headerRenderer is defined by a TableColumn.

Returns:
the default renderer
Since:
1.3

columnAtPoint

public int columnAtPoint(Point point)
Returns the index of the column that point lies in, or -1 if it lies out of bounds.

Returns:
the index of the column that point lies in, or -1 if it lies out of bounds

getHeaderRect

public Rectangle getHeaderRect(int column)
Returns the rectangle containing the header tile at column. When the column parameter is out of bounds this method uses the same conventions as the JTable method getCellRect.

Returns:
the rectangle containing the header tile at column
See Also:
JTable.getCellRect(int, int, boolean)

getToolTipText

public String getToolTipText(MouseEvent event)
Allows the renderer's tips to be used if there is text set.

Overrides:
getToolTipText in class JComponent
Parameters:
event - the location of the event identifies the proper renderer and, therefore, the proper tip
Returns:
the tool tip for this component

getUI

public TableHeaderUI getUI()
Returns the look and feel (L&F) object that renders this component.

Returns:
the TableHeaderUI object that renders this component

setUI

public void setUI(TableHeaderUI ui)
Sets the look and feel (L&F) object that renders this component.

Parameters:
ui - the TableHeaderUI L&F object
See Also:
UIDefaults.getUI(javax.swing.JComponent)

updateUI

public void updateUI()
Notification from the UIManager that the look and feel (L&F) has changed. Replaces the current UI object with the latest version from the UIManager.

Overrides:
updateUI in class JComponent
See Also:
JComponent.updateUI()

getUIClassID

public String getUIClassID()
Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.

Overrides:
getUIClassID in class JComponent
Returns:
the string "TableHeaderUI"
See Also:
JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

setColumnModel

public void setColumnModel(TableColumnModel columnModel)
Sets the column model for this table to newModel and registers for listener notifications from the new column model.

Parameters:
columnModel - the new data source for this table
Throws:
IllegalArgumentException - if newModel is null
See Also:
getColumnModel()

getColumnModel

public TableColumnModel getColumnModel()
Returns the TableColumnModel that contains all column information of this table header.

Returns:
the columnModel property
See Also:
setColumnModel(javax.swing.table.TableColumnModel)

columnAdded

public void columnAdded(TableColumnModelEvent e)
Invoked when a column is added to the table column model.

Application code will not use these methods explicitly, they are used internally by JTable.

Specified by:
columnAdded in interface TableColumnModelListener
Parameters:
e - the event received
See Also:
TableColumnModelListener

columnRemoved

public void columnRemoved(TableColumnModelEvent e)
Invoked when a column is removed from the table column model.

Application code will not use these methods explicitly, they are used internally by JTable.

Specified by:
columnRemoved in interface TableColumnModelListener
Parameters:
e - the event received
See Also:
TableColumnModelListener

columnMoved

public void columnMoved(TableColumnModelEvent e)
Invoked when a column is repositioned.

Application code will not use these methods explicitly, they are used internally by JTable.

Specified by:
columnMoved in interface TableColumnModelListener
Parameters:
e - the event received
See Also:
TableColumnModelListener

columnMarginChanged

public void columnMarginChanged(ChangeEvent e)
Invoked when a column is moved due to a margin change.

Application code will not use these methods explicitly, they are used internally by JTable.

Specified by:
columnMarginChanged in interface TableColumnModelListener
Parameters:
e - the event received
See Also:
TableColumnModelListener

columnSelectionChanged

public void columnSelectionChanged(ListSelectionEvent e)
Invoked when the selection model of the TableColumnModel is changed. This method currently has no effect (the header is not redrawn).

Application code will not use these methods explicitly, they are used internally by JTable.

Specified by:
columnSelectionChanged in interface TableColumnModelListener
Parameters:
e - the event received
See Also:
TableColumnModelListener

createDefaultColumnModel

protected TableColumnModel createDefaultColumnModel()
Returns the default column model object which is a DefaultTableColumnModel. A subclass can override this method to return a different column model object

Returns:
the default column model object

createDefaultRenderer

protected TableCellRenderer createDefaultRenderer()
Returns a default renderer to be used when no header renderer is defined by a TableColumn.

Returns:
the default table column renderer
Since:
1.3

initializeLocalVars

protected void initializeLocalVars()
Initializes the local variables and properties with default values. Used by the constructor methods.


resizeAndRepaint

public void resizeAndRepaint()
Sizes the header and marks it as needing display. Equivalent to revalidate followed by repaint.


setDraggedColumn

public void setDraggedColumn(TableColumn aColumn)
Sets the header's draggedColumn to aColumn.

Application code will not use this method explicitly, it is used internally by the column dragging mechanism.

Parameters:
aColumn - the column being dragged, or null if no column is being dragged

setDraggedDistance

public void setDraggedDistance(int distance)
Sets the header's draggedDistance to distance.

Parameters:
distance - the distance dragged

setResizingColumn

public void setResizingColumn(TableColumn aColumn)
Sets the header's resizingColumn to aColumn.

Application code will not use this method explicitly, it is used internally by the column sizing mechanism.

Parameters:
aColumn - the column being resized, or null if no column is being resized

paramString

protected String paramString()
Returns a string representation of this JTableHeader. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

Overriding paramString to provide information about the specific new aspects of the JFC components.

Overrides:
paramString in class JComponent
Returns:
a string representation of this JTableHeader

getAccessibleContext

public AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this JTableHeader. For JTableHeaders, the AccessibleContext takes the form of an AccessibleJTableHeader. A new AccessibleJTableHeader instance is created if necessary.

Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class JComponent
Returns:
an AccessibleJTableHeader that serves as the AccessibleContext of this JTableHeader

Java™ Platform
Standard Ed. 6

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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