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Class JTable.AccessibleJTable

java.lang.Object
javax.accessibility.AccessibleContext
java.awt.Component.AccessibleAWTComponent
java.awt.Container.AccessibleAWTContainer
javax.swing.JComponent.AccessibleJComponent
javax.swing.JTable.AccessibleJTable
All Implemented Interfaces:
PropertyChangeListener, Serializable, EventListener, AccessibleComponent, AccessibleExtendedComponent, AccessibleExtendedTable, AccessibleSelection, AccessibleTable, CellEditorListener, ListSelectionListener, TableColumnModelListener, TableModelListener
Enclosing class:
JTable
protected class JTable.AccessibleJTable extends JComponent.AccessibleJComponent implements AccessibleSelection, ListSelectionListener, TableModelListener, TableColumnModelListener, CellEditorListener, PropertyChangeListener, AccessibleExtendedTable
This class implements accessibility support for the JTable class. It provides an implementation of the Java Accessibility API appropriate to table user-interface elements.

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.

Nested Class Summary

Modifier and Type Class Description
protected class  JTable.AccessibleJTable.AccessibleJTableCell
The class provides an implementation of the Java Accessibility API appropriate to table cells.
protected class  JTable.AccessibleJTable.AccessibleJTableModelChange
Describes a change in the accessible table model.

Nested classes/interfaces declared in class javax.swing.JComponent.AccessibleJComponent

JComponent.AccessibleJComponent.AccessibleContainerHandler, JComponent.AccessibleJComponent.AccessibleFocusHandler

Nested classes/interfaces declared in class java.awt.Component.AccessibleAWTComponent

Component.AccessibleAWTComponent.AccessibleAWTComponentHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler

Field Summary

Fields declared in class javax.swing.JComponent.AccessibleJComponent

accessibleFocusHandler

Fields declared in class java.awt.Container.AccessibleAWTContainer

accessibleContainerHandler

Fields declared in class java.awt.Component.AccessibleAWTComponent

accessibleAWTComponentHandler, accessibleAWTFocusHandler

Fields declared in class javax.accessibility.AccessibleContext

ACCESSIBLE_ACTION_PROPERTY, ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, ACCESSIBLE_CARET_PROPERTY, ACCESSIBLE_CHILD_PROPERTY, ACCESSIBLE_COMPONENT_BOUNDS_CHANGED, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_HYPERTEXT_OFFSET, ACCESSIBLE_INVALIDATE_CHILDREN, ACCESSIBLE_NAME_PROPERTY, ACCESSIBLE_SELECTION_PROPERTY, ACCESSIBLE_STATE_PROPERTY, ACCESSIBLE_TABLE_CAPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED, ACCESSIBLE_TABLE_MODEL_CHANGED, ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_ROW_HEADER_CHANGED, ACCESSIBLE_TABLE_SUMMARY_CHANGED, ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED, ACCESSIBLE_TEXT_PROPERTY, ACCESSIBLE_VALUE_PROPERTY, ACCESSIBLE_VISIBLE_DATA_PROPERTY, accessibleDescription, accessibleName, accessibleParent

Constructor Summary

AccessibleJTable()
Modifier Constructor Description
protected
AccessibleJTable constructor

Method Summary

Modifier and Type Method Description
void addAccessibleSelection(int i)
Adds the specified Accessible child of the object to the object's selection.
void clearAccessibleSelection()
Clears the selection in the object, so that no children in the object are selected.
void columnAdded(TableColumnModelEvent e)
Track changes to the table contents (column insertions)
void columnMarginChanged(ChangeEvent e)
Track changes of a column moving due to margin changes.
void columnMoved(TableColumnModelEvent e)
Track changes of a column repositioning.
void columnRemoved(TableColumnModelEvent e)
Track changes to the table contents (column deletions)
void columnSelectionChanged(ListSelectionEvent e)
Track that the selection model of the TableColumnModel changed.
void editingCanceled(ChangeEvent e)
Invoked when editing is canceled.
void editingStopped(ChangeEvent e)
Track changes to a cell's contents.
Accessible getAccessibleAt(int r, int c)
Returns the Accessible at a specified row and column in the table.
Accessible getAccessibleAt(Point p)
Returns the Accessible child, if one exists, contained at the local coordinate Point.
Accessible getAccessibleCaption()
Returns the caption for the table.
Accessible getAccessibleChild(int i)
Returns the nth Accessible child of the object.
int getAccessibleChildrenCount()
Returns the number of accessible children in the object.
int getAccessibleColumn(int index)
Returns the column number of an index in the table.
int getAccessibleColumnAtIndex(int i)
Returns the column at a given index into the table.
int getAccessibleColumnCount()
Returns the number of columns in the table.
Accessible getAccessibleColumnDescription(int c)
Returns the description of the specified column in the table.
int getAccessibleColumnExtentAt(int r, int c)
Returns the number of columns occupied by the Accessible at a given (row, column).
AccessibleTable getAccessibleColumnHeader()
Returns the column headers as an AccessibleTable.
int getAccessibleIndex(int r, int c)
Returns the index at a row and column in the table.
int getAccessibleIndexAt(int r, int c)
Returns the index at a given (row, column) in the table.
AccessibleRole getAccessibleRole()
Gets the role of this object.
int getAccessibleRow(int index)
Returns the row number of an index in the table.
int getAccessibleRowAtIndex(int i)
Returns the row at a given index into the table.
int getAccessibleRowCount()
Returns the number of rows in the table.
Accessible getAccessibleRowDescription(int r)
Returns the description of the specified row in the table.
int getAccessibleRowExtentAt(int r, int c)
Returns the number of rows occupied by the Accessible at a specified row and column in the table.
AccessibleTable getAccessibleRowHeader()
Returns the row headers as an AccessibleTable.
AccessibleSelection getAccessibleSelection()
Get the AccessibleSelection associated with this object.
Accessible getAccessibleSelection(int i)
Returns an Accessible representing the specified selected child in the object.
int getAccessibleSelectionCount()
Returns the number of Accessible children currently selected.
Accessible getAccessibleSummary()
Returns the summary description of the table.
AccessibleTable getAccessibleTable()
Gets the AccessibleTable associated with this object.
int[] getSelectedAccessibleColumns()
Returns the selected columns in a table.
int[] getSelectedAccessibleRows()
Returns the selected rows in a table.
boolean isAccessibleChildSelected(int i)
Determines if the current child of this object is selected.
boolean isAccessibleColumnSelected(int c)
Returns a boolean value indicating whether the specified column is selected.
boolean isAccessibleRowSelected(int r)
Returns a boolean value indicating whether the specified row is selected.
boolean isAccessibleSelected(int r, int c)
Returns a boolean value indicating whether the accessible at a given (row, column) is selected.
void propertyChange(PropertyChangeEvent e)
Track changes to selection model, column model, etc. so as to be able to re-place listeners on those in order to pass on information to the Accessibility PropertyChange mechanism
void removeAccessibleSelection(int i)
Removes the specified child of the object from the object's selection.
void selectAllAccessibleSelection()
Causes every child of the object to be selected, but only if the JTable supports multiple selections, and if individual cell selection is enabled.
void setAccessibleCaption(Accessible a)
Sets the caption for the table.
void setAccessibleColumnDescription(int c, Accessible a)
Sets the description text of the specified column of the table.
void setAccessibleColumnHeader(AccessibleTable a)
Sets the column headers as an AccessibleTable.
void setAccessibleRowDescription(int r, Accessible a)
Sets the description text of the specified row of the table.
void setAccessibleRowHeader(AccessibleTable a)
Sets the row headers as an AccessibleTable.
void setAccessibleSummary(Accessible a)
Sets the summary description of the table.
void tableChanged(TableModelEvent e)
Track changes to the table contents
void tableRowsDeleted(TableModelEvent e)
Track changes to the table contents (row deletions)
void tableRowsInserted(TableModelEvent e)
Track changes to the table contents (row insertions)
void valueChanged(ListSelectionEvent e)
Track changes to table cell selections

Methods declared in class javax.swing.JComponent.AccessibleJComponent

addPropertyChangeListener, getAccessibleDescription, getAccessibleKeyBinding, getAccessibleName, getAccessibleStateSet, getBorderTitle, getTitledBorderText, getToolTipText, removePropertyChangeListener

Methods declared in class java.awt.Component.AccessibleAWTComponent

addFocusListener, contains, getAccessibleComponent, getAccessibleIndexInParent, getAccessibleParent, getBackground, getBounds, getCursor, getFont, getFontMetrics, getForeground, getLocale, getLocation, getLocationOnScreen, getSize, isEnabled, isFocusTraversable, isShowing, isVisible, removeFocusListener, requestFocus, setBackground, setBounds, setCursor, setEnabled, setFont, setForeground, setLocation, setSize, setVisible

Methods declared in class javax.accessibility.AccessibleContext

firePropertyChange, getAccessibleAction, getAccessibleEditableText, getAccessibleIcon, getAccessibleRelationSet, getAccessibleText, getAccessibleValue, setAccessibleDescription, setAccessibleName, setAccessibleParent

Methods declared in class java.lang.Object

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

Methods declared in interface javax.accessibility.AccessibleComponent

addFocusListener, contains, getBackground, getBounds, getCursor, getFont, getFontMetrics, getForeground, getLocation, getLocationOnScreen, getSize, isEnabled, isFocusTraversable, isShowing, isVisible, removeFocusListener, requestFocus, setBackground, setBounds, setCursor, setEnabled, setFont, setForeground, setLocation, setSize, setVisible

Constructor Details

AccessibleJTable

protected AccessibleJTable()
AccessibleJTable constructor
Since:
1.5

Method Details

propertyChange

public void propertyChange(PropertyChangeEvent e)
Track changes to selection model, column model, etc. so as to be able to re-place listeners on those in order to pass on information to the Accessibility PropertyChange mechanism
Specified by:
propertyChange in interface PropertyChangeListener
Parameters:
e - A PropertyChangeEvent object describing the event source and the property that has changed.

tableChanged

public void tableChanged(TableModelEvent e)
Track changes to the table contents
Specified by:
tableChanged in interface TableModelListener
Parameters:
e - a TableModelEvent describing the event

tableRowsInserted

public void tableRowsInserted(TableModelEvent e)
Track changes to the table contents (row insertions)
Parameters:
e - a TableModelEvent describing the event

tableRowsDeleted

public void tableRowsDeleted(TableModelEvent e)
Track changes to the table contents (row deletions)
Parameters:
e - a TableModelEvent describing the event

columnAdded

public void columnAdded(TableColumnModelEvent e)
Track changes to the table contents (column insertions)
Specified by:
columnAdded in interface TableColumnModelListener
Parameters:
e - a TableColumnModelEvent

columnRemoved

public void columnRemoved(TableColumnModelEvent e)
Track changes to the table contents (column deletions)
Specified by:
columnRemoved in interface TableColumnModelListener
Parameters:
e - a TableColumnModelEvent

columnMoved

public void columnMoved(TableColumnModelEvent e)
Track changes of a column repositioning.
Specified by:
columnMoved in interface TableColumnModelListener
Parameters:
e - a TableColumnModelEvent
See Also:

columnMarginChanged

public void columnMarginChanged(ChangeEvent e)
Track changes of a column moving due to margin changes.
Specified by:
columnMarginChanged in interface TableColumnModelListener
Parameters:
e - a ChangeEvent
See Also:

columnSelectionChanged

public void columnSelectionChanged(ListSelectionEvent e)
Track that the selection model of the TableColumnModel changed.
Specified by:
columnSelectionChanged in interface TableColumnModelListener
Parameters:
e - a ListSelectionEvent
See Also:

editingStopped

public void editingStopped(ChangeEvent e)
Track changes to a cell's contents. Invoked when editing is finished. The changes are saved, the editor object is discarded, and the cell is rendered once again.
Specified by:
editingStopped in interface CellEditorListener
Parameters:
e - the ChangeEvent containing the source of the event
See Also:

editingCanceled

public void editingCanceled(ChangeEvent e)
Invoked when editing is canceled. The editor object is discarded and the cell is rendered once again.
Specified by:
editingCanceled in interface CellEditorListener
Parameters:
e - the ChangeEvent containing the source of the event
See Also:

valueChanged

public void valueChanged(ListSelectionEvent e)
Track changes to table cell selections
Specified by:
valueChanged in interface ListSelectionListener
Parameters:
e - the event that characterizes the change.

getAccessibleSelection

public AccessibleSelection getAccessibleSelection()
Get the AccessibleSelection associated with this object. In the implementation of the Java Accessibility API for this class, return this object, which is responsible for implementing the AccessibleSelection interface on behalf of itself.
Overrides:
getAccessibleSelection in class AccessibleContext
Returns:
this object
See Also:

getAccessibleRole

public AccessibleRole getAccessibleRole()
Gets the role of this object.
Overrides:
getAccessibleRole in class JComponent.AccessibleJComponent
Returns:
an instance of AccessibleRole describing the role of the object
See Also:

getAccessibleAt

public Accessible getAccessibleAt(Point p)
Returns the Accessible child, if one exists, contained at the local coordinate Point.
Specified by:
getAccessibleAt in interface AccessibleComponent
Overrides:
getAccessibleAt in class Container.AccessibleAWTContainer
Parameters:
p - the point defining the top-left corner of the Accessible, given in the coordinate space of the object's parent
Returns:
the Accessible, if it exists, at the specified location; else null

getAccessibleChildrenCount

public int getAccessibleChildrenCount()
Returns the number of accessible children in the object. If all of the children of this object implement Accessible, then this method should return the number of children of this object.
Overrides:
getAccessibleChildrenCount in class JComponent.AccessibleJComponent
Returns:
the number of accessible children in the object

getAccessibleChild

public Accessible getAccessibleChild(int i)
Returns the nth Accessible child of the object.
Overrides:
getAccessibleChild in class JComponent.AccessibleJComponent
Parameters:
i - zero-based index of child
Returns:
the nth Accessible child of the object
See Also:

getAccessibleSelectionCount

public int getAccessibleSelectionCount()
Returns the number of Accessible children currently selected. If no children are selected, the return value will be 0.
Specified by:
getAccessibleSelectionCount in interface AccessibleSelection
Returns:
the number of items currently selected

getAccessibleSelection

public Accessible getAccessibleSelection(int i)
Returns an Accessible representing the specified selected child in the object. If there isn't a selection, or there are fewer children selected than the integer passed in, the return value will be null.

Note that the index represents the i-th selected child, which is different from the i-th child.

Specified by:
getAccessibleSelection in interface AccessibleSelection
Parameters:
i - the zero-based index of selected children
Returns:
the i-th selected child
See Also:

isAccessibleChildSelected

public boolean isAccessibleChildSelected(int i)
Determines if the current child of this object is selected.
Specified by:
isAccessibleChildSelected in interface AccessibleSelection
Parameters:
i - the zero-based index of the child in this Accessible object
Returns:
true if the current child of this object is selected
See Also:

addAccessibleSelection

public void addAccessibleSelection(int i)
Adds the specified Accessible child of the object to the object's selection. If the object supports multiple selections, the specified child is added to any existing selection, otherwise it replaces any existing selection in the object. If the specified child is already selected, this method has no effect.

This method only works on JTables which have individual cell selection enabled.

Specified by:
addAccessibleSelection in interface AccessibleSelection
Parameters:
i - the zero-based index of the child
See Also:

removeAccessibleSelection

public void removeAccessibleSelection(int i)
Removes the specified child of the object from the object's selection. If the specified item isn't currently selected, this method has no effect.

This method only works on JTables which have individual cell selection enabled.

Specified by:
removeAccessibleSelection in interface AccessibleSelection
Parameters:
i - the zero-based index of the child
See Also:

clearAccessibleSelection

public void clearAccessibleSelection()
Clears the selection in the object, so that no children in the object are selected.
Specified by:
clearAccessibleSelection in interface AccessibleSelection

selectAllAccessibleSelection

public void selectAllAccessibleSelection()
Causes every child of the object to be selected, but only if the JTable supports multiple selections, and if individual cell selection is enabled.
Specified by:
selectAllAccessibleSelection in interface AccessibleSelection

getAccessibleRow

public int getAccessibleRow(int index)
Returns the row number of an index in the table.
Specified by:
getAccessibleRow in interface AccessibleExtendedTable
Parameters:
index - the zero-based index in the table
Returns:
the zero-based row of the table if one exists; otherwise -1.
Since:
1.4

getAccessibleColumn

public int getAccessibleColumn(int index)
Returns the column number of an index in the table.
Specified by:
getAccessibleColumn in interface AccessibleExtendedTable
Parameters:
index - the zero-based index in the table
Returns:
the zero-based column of the table if one exists; otherwise -1.
Since:
1.4

getAccessibleIndex

public int getAccessibleIndex(int r, int c)
Returns the index at a row and column in the table.
Specified by:
getAccessibleIndex in interface AccessibleExtendedTable
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the zero-based index in the table if one exists; otherwise -1.
Since:
1.4

getAccessibleTable

public AccessibleTable getAccessibleTable()
Gets the AccessibleTable associated with this object. In the implementation of the Java Accessibility API for this class, return this object, which is responsible for implementing the AccessibleTables interface on behalf of itself.
Overrides:
getAccessibleTable in class AccessibleContext
Returns:
this object
Since:
1.3
See Also:

getAccessibleCaption

public Accessible getAccessibleCaption()
Returns the caption for the table.
Specified by:
getAccessibleCaption in interface AccessibleTable
Returns:
the caption for the table
Since:
1.3

setAccessibleCaption

public void setAccessibleCaption(Accessible a)
Sets the caption for the table.
Specified by:
setAccessibleCaption in interface AccessibleTable
Parameters:
a - the caption for the table
Since:
1.3

getAccessibleSummary

public Accessible getAccessibleSummary()
Returns the summary description of the table.
Specified by:
getAccessibleSummary in interface AccessibleTable
Returns:
the summary description of the table
Since:
1.3

setAccessibleSummary

public void setAccessibleSummary(Accessible a)
Sets the summary description of the table.
Specified by:
setAccessibleSummary in interface AccessibleTable
Parameters:
a - the summary description of the table
Since:
1.3

getAccessibleRowCount

public int getAccessibleRowCount()
Description copied from interface: AccessibleTable
Returns the number of rows in the table.
Specified by:
getAccessibleRowCount in interface AccessibleTable
Returns:
the number of rows in the table

getAccessibleColumnCount

public int getAccessibleColumnCount()
Description copied from interface: AccessibleTable
Returns the number of columns in the table.
Specified by:
getAccessibleColumnCount in interface AccessibleTable
Returns:
the number of columns in the table

getAccessibleAt

public Accessible getAccessibleAt(int r, int c)
Description copied from interface: AccessibleTable
Returns the Accessible at a specified row and column in the table.
Specified by:
getAccessibleAt in interface AccessibleTable
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the Accessible at the specified row and column

getAccessibleRowExtentAt

public int getAccessibleRowExtentAt(int r, int c)
Returns the number of rows occupied by the Accessible at a specified row and column in the table.
Specified by:
getAccessibleRowExtentAt in interface AccessibleTable
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the number of rows occupied by the Accessible at a specified row and column in the table
Since:
1.3

getAccessibleColumnExtentAt

public int getAccessibleColumnExtentAt(int r, int c)
Returns the number of columns occupied by the Accessible at a given (row, column).
Specified by:
getAccessibleColumnExtentAt in interface AccessibleTable
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the number of columns occupied by the Accessible at a specified row and column in the table
Since:
1.3

getAccessibleRowHeader

public AccessibleTable getAccessibleRowHeader()
Returns the row headers as an AccessibleTable.
Specified by:
getAccessibleRowHeader in interface AccessibleTable
Returns:
an AccessibleTable representing the row headers
Since:
1.3

setAccessibleRowHeader

public void setAccessibleRowHeader(AccessibleTable a)
Sets the row headers as an AccessibleTable.
Specified by:
setAccessibleRowHeader in interface AccessibleTable
Parameters:
a - an AccessibleTable representing the row headers
Since:
1.3

getAccessibleColumnHeader

public AccessibleTable getAccessibleColumnHeader()
Returns the column headers as an AccessibleTable.
Specified by:
getAccessibleColumnHeader in interface AccessibleTable
Returns:
an AccessibleTable representing the column headers, or null if the table header is null
Since:
1.3

setAccessibleColumnHeader

public void setAccessibleColumnHeader(AccessibleTable a)
Sets the column headers as an AccessibleTable.
Specified by:
setAccessibleColumnHeader in interface AccessibleTable
Parameters:
a - an AccessibleTable representing the column headers
Since:
1.3

getAccessibleRowDescription

public Accessible getAccessibleRowDescription(int r)
Returns the description of the specified row in the table.
Specified by:
getAccessibleRowDescription in interface AccessibleTable
Parameters:
r - zero-based row of the table
Returns:
the description of the row
Since:
1.3

setAccessibleRowDescription

public void setAccessibleRowDescription(int r, Accessible a)
Sets the description text of the specified row of the table.
Specified by:
setAccessibleRowDescription in interface AccessibleTable
Parameters:
r - zero-based row of the table
a - the description of the row
Since:
1.3

getAccessibleColumnDescription

public Accessible getAccessibleColumnDescription(int c)
Returns the description of the specified column in the table.
Specified by:
getAccessibleColumnDescription in interface AccessibleTable
Parameters:
c - zero-based column of the table
Returns:
the description of the column
Since:
1.3

setAccessibleColumnDescription

public void setAccessibleColumnDescription(int c, Accessible a)
Sets the description text of the specified column of the table.
Specified by:
setAccessibleColumnDescription in interface AccessibleTable
Parameters:
c - zero-based column of the table
a - the description of the column
Since:
1.3

isAccessibleSelected

public boolean isAccessibleSelected(int r, int c)
Returns a boolean value indicating whether the accessible at a given (row, column) is selected.
Specified by:
isAccessibleSelected in interface AccessibleTable
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the boolean value true if the accessible at (row, column) is selected; otherwise, the boolean value false
Since:
1.3

isAccessibleRowSelected

public boolean isAccessibleRowSelected(int r)
Returns a boolean value indicating whether the specified row is selected.
Specified by:
isAccessibleRowSelected in interface AccessibleTable
Parameters:
r - zero-based row of the table
Returns:
the boolean value true if the specified row is selected; otherwise, false
Since:
1.3

isAccessibleColumnSelected

public boolean isAccessibleColumnSelected(int c)
Returns a boolean value indicating whether the specified column is selected.
Specified by:
isAccessibleColumnSelected in interface AccessibleTable
Parameters:
c - zero-based column of the table
Returns:
the boolean value true if the specified column is selected; otherwise, false
Since:
1.3

getSelectedAccessibleRows

public int[] getSelectedAccessibleRows()
Returns the selected rows in a table.
Specified by:
getSelectedAccessibleRows in interface AccessibleTable
Returns:
an array of selected rows where each element is a zero-based row of the table
Since:
1.3

getSelectedAccessibleColumns

public int[] getSelectedAccessibleColumns()
Returns the selected columns in a table.
Specified by:
getSelectedAccessibleColumns in interface AccessibleTable
Returns:
an array of selected columns where each element is a zero-based column of the table
Since:
1.3

getAccessibleRowAtIndex

public int getAccessibleRowAtIndex(int i)
Returns the row at a given index into the table.
Parameters:
i - zero-based index into the table
Returns:
the row at a given index
Since:
1.3

getAccessibleColumnAtIndex

public int getAccessibleColumnAtIndex(int i)
Returns the column at a given index into the table.
Parameters:
i - zero-based index into the table
Returns:
the column at a given index
Since:
1.3

getAccessibleIndexAt

public int getAccessibleIndexAt(int r, int c)
Returns the index at a given (row, column) in the table.
Parameters:
r - zero-based row of the table
c - zero-based column of the table
Returns:
the index into the table
Since:
1.3

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