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javax.swing.table
Class JTableHeader
java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.table.JTableHeader
-
All Implemented Interfaces:
-
Accessible
,
EventListener
,
ImageObserver
,
MenuContainer
,
Serializable
,
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 JavaBeans
TM
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 inherited from class java.awt.
Component
|
Component.AccessibleAWTComponent
,
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 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
,
addPropertyChangeListener
,
addPropertyChangeListener
,
addVetoableChangeListener
,
computeVisibleRect
,
contains
,
createToolTip
,
disable
,
enable
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
fireVetoableChange
,
getActionForKeyStroke
,
getActionMap
,
getAlignmentX
,
getAlignmentY
,
getAncestorListeners
,
getAutoscrolls
,
getBorder
,
getBounds
,
getClientProperty
,
getComponentGraphics
,
getComponentPopupMenu
,
getConditionForKeyStroke
,
getDebugGraphicsOptions
,
getDefaultLocale
,
getFontMetrics
,
getGraphics
,
getHeight
,
getInheritsPopupMenu
,
getInputMap
,
getInputMap
,
getInputVerifier
,
getInsets
,
getInsets
,
getListeners
,
getLocation
,
getMaximumSize
,
getMinimumSize
,
getNextFocusableComponent
,
getPopupLocation
getPreferredSize
,
getPreferredSize
getPropertyChangeListeners
,
getPropertyChangeListeners
,
getRegisteredKeyStrokes
,
getRootPane
,
getSize
,
getToolTipLocation
,
getToolTipText
,
getTopLevelAncestor
,
getTransferHandler
,
getVerifyInputWhenFocusTarget
,
getVetoableChangeListeners
,
getVisibleRect
,
getWidth
,
getX
,
getY
,
grabFocus
,
isDoubleBuffered
,
isLightweightComponent
,
isManagingFocus
,
isMaximumSizeSet
,
isMinimumSizeSet
,
isOpaque
,
isOptimizedDrawingEnabled
,
isPaintingTile
,
isPreferredSizeSet
,
isRequestFocusEnabled
,
isValidateRoot
,
paint
,
paintBorder
,
paintChildren
,
paintComponent
,
paintImmediately
,
paintImmediately
,
print
,
printAll
,
printBorder
,
printChildren
,
printComponent
,
processComponentKeyEvent
,
processKeyBinding
,
processKeyEvent
,
processMouseEvent
,
processMouseMotionEvent
,
putClientProperty
,
registerKeyboardAction
,
registerKeyboardAction
,
removeAncestorListener
,
removeNotify
,
removePropertyChangeListener
,
removePropertyChangeListener
,
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
,
setFocusCycleRoot
setFocusTraversalKeys
,
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
,
getFontMetrics
,
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
,
processMouseEvent
,
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
|
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.
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()
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
getDefaultRenderer
public TableCellRenderer getDefaultRenderer()
-
Returns the default renderer used when no headerRenderer is defined by a TableColumn.
-
-
-
Returns:
-
the default renderer
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
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.
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Parameters:
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aColumn - the column being dragged, or null if no column is being dragged
setDraggedDistance
public void setDraggedDistance(int distance)
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Sets the header's draggedDistance to distance.
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Parameters:
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distance - the distance dragged
setResizingColumn
public void setResizingColumn(TableColumn aColumn)
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Sets the header's resizingColumn to aColumn.
Application code will not use this method explicitly, it is used internally by the column sizing mechanism.
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Parameters:
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aColumn - the column being resized, or null if no column is being resized
paramString
protected String paramString()
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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.
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Overrides:
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paramString
in class
JComponent
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Returns:
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a string representation of this JTableHeader
getAccessibleContext
public AccessibleContext getAccessibleContext()
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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.
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Specified by:
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getAccessibleContext
in interface
Accessible
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Overrides:
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getAccessibleContext
in class
JComponent
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Returns:
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an AccessibleJTableHeader that serves as the AccessibleContext of this JTableHeader