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## javax.swing.table
Interface TableColumnModel

All Known Implementing Classes:
  DefaultTableColumnModel

public interface TableColumnModel

Defines the requirements for a table column model object suitable for use with `JTable`.

See Also:
  `DefaultTableColumnModel`

Method Summary
`void` | `addColumn(TableColumn aColumn)` Appends `aColumn` to the end of the `tableColumns` array.
`void` | `addColumnModelListener(TableColumnModelListener x)` Adds a listener for table column model events.
`TableColumn` | `getColumn(int columnIndex)` Returns the `TableColumn` object for the column at `columnIndex`.
`int` | `getColumnCount()` Returns the number of columns in the model.
`int` | `getColumnIndex(Object columnIdentifier)` Returns the index of the first column in the table whose identifier is equal to `identifier`, when compared using `equals`.
`int` | `getColumnIndexAtX(int xPosition)` Returns the index of the column that lies on the horizontal point, `xPosition`; or -1 if it lies outside the any of the column's bounds.
`int` | `getColumnMargin()` Returns the width between the cells in each column.
`Enumeration` | `getColumns()` Returns an `Enumeration` of all the columns in the model.
`boolean` | `getColumnSelectionAllowed()` Returns true if columns may be selected.
`int` | `getSelectedColumnCount()` Returns the number of selected columns.
`int[]` | `getSelectedColumns()` Returns an array of indicies of all selected columns.
`ListSelectionModel` | `getSelectionModel()` Returns the current selection model.
`int` | `getTotalColumnWidth()` Returns the total width of all the columns.
`void` | `moveColumn(int columnIndex, int newIndex)` Moves the column and its header at `columnIndex` to `newIndex`.
`void` | `removeColumn(TableColumn column)` Deletes the `TableColumn` `column` from the `tableColumns` array.
`void` | `removeColumnModelListener(TableColumnModelListener x)` Removes a listener for table column model events.
`void` | `setColumnMargin(int newMargin)` Sets the `TableColumn`'s column margin to `newMargin`.
`void` | `setColumnSelectionAllowed(boolean flag)` Sets whether the columns in this model may be selected.
`void` | `setSelectionModel(ListSelectionModel newModel)` Sets the selection model.

Method Detail

### addColumn

    public void addColumn(TableColumn aColumn)

  Appends `aColumn` to the end of the `tableColumns` array. This method posts a `columnAdded` event to its listeners.

  Parameters:
    `aColumn` - the `TableColumn` to be added
  See Also:
    `removeColumn(javax.swing.table.TableColumn)`

### removeColumn

    public void removeColumn(TableColumn column)

  Deletes the `TableColumn` `column` from the `tableColumns` array. This method will do nothing if `column` is not in the table's column list. This method posts a `columnRemoved` event to its listeners.

  Parameters:
    `column` - the `TableColumn` to be removed
  See Also:
    `addColumn(javax.swing.table.TableColumn)`

### moveColumn

    public void moveColumn(int columnIndex,
                           int newIndex)

  Moves the column and its header at `columnIndex` to `newIndex`. The old column at `columnIndex` will now be found at `newIndex`. The column that used to be at `newIndex` is shifted left or right to make room. This will not move any columns if `columnIndex` equals `newIndex`. This method posts a `columnMoved` event to its listeners.

  Parameters:
    `columnIndex` - the index of column to be moved
    `newIndex` - index of the column's new location
  Throws:
    `IllegalArgumentException` - if `columnIndex` or `newIndex` are not in the valid range

### setColumnMargin

    public void setColumnMargin(int newMargin)

  Sets the `TableColumn`'s column margin to `newMargin`. This method posts a `columnMarginChanged` event to its listeners.

  Parameters:
    `newMargin` - the width, in pixels, of the new column margins
  See Also:
    `getColumnMargin()`

### getColumnCount

    public int getColumnCount()

  Returns the number of columns in the model.

  Returns:
    the number of columns in the model

### getColumns

    public Enumeration getColumns()

  Returns an `Enumeration` of all the columns in the model.

  Returns:
    an `Enumeration` of all the columns in the model

### getColumnIndex

    public int getColumnIndex(Object columnIdentifier)

  Returns the index of the first column in the table whose identifier is equal to `identifier`, when compared using `equals`.

  Parameters:
    `columnIdentifier` - the identifier object
  Returns:
    the index of the first table column whose identifier is equal to `identifier`
  Throws:
    `IllegalArgumentException` - if `identifier` is `null`, or no `TableColumn` has this `identifier`
  See Also:
    `getColumn(int)`

### getColumn

    public TableColumn getColumn(int columnIndex)

  Returns the `TableColumn` object for the column at `columnIndex`.

  Parameters:
    `columnIndex` - the index of the desired column
  Returns:
    the `TableColumn` object for the column at `columnIndex`

### getColumnMargin

    public int getColumnMargin()

  Returns the width between the cells in each column.

  Returns:
    the margin, in pixels, between the cells

### getColumnIndexAtX

    public int getColumnIndexAtX(int xPosition)

  Returns the index of the column that lies on the horizontal point, `xPosition`; or -1 if it lies outside the any of the column's bounds. In keeping with Swing's separable model architecture, a TableColumnModel does not know how the table columns actually appear on screen. The visual presentation of the columns is the responsibility of the view/controller object using this model (typically JTable). The view/controller need not display the columns sequentially from left to right. For example, columns could be displayed from right to left to accomodate a locale preference or some columns might be hidden at the request of the user. Because the model does not know how the columns are laid out on screen, the given `xPosition` should not be considered to be a coordinate in 2D graphics space. Instead, it should be considered to be a width from the start of the first column in the model. If the column index for a given X coordinate in 2D space is required, `JTable.columnAtPoint` can be used instead.

  Returns:
    the index of the column; or -1 if no column is found
  See Also:
    `JTable.columnAtPoint(java.awt.Point)`

### getTotalColumnWidth

    public int getTotalColumnWidth()

  Returns the total width of all the columns.

  Returns:
    the total computed width of all columns

### setColumnSelectionAllowed

    public void setColumnSelectionAllowed(boolean flag)

  Sets whether the columns in this model may be selected.

  Parameters:
    `flag` - true if columns may be selected; otherwise false
  See Also:
    `getColumnSelectionAllowed()`

### getColumnSelectionAllowed

    public boolean getColumnSelectionAllowed()

  Returns true if columns may be selected.

  Returns:
    true if columns may be selected
  See Also:
    `setColumnSelectionAllowed(boolean)`

### getSelectedColumns

    public int[] getSelectedColumns()

  Returns an array of indicies of all selected columns.

  Returns:
    an array of integers containing the indicies of all selected columns; or an empty array if nothing is selected

### getSelectedColumnCount

    public int getSelectedColumnCount()

  Returns the number of selected columns.

  Returns:
    the number of selected columns; or 0 if no columns are selected

### setSelectionModel

    public void setSelectionModel(ListSelectionModel newModel)

  Sets the selection model.

  Parameters:
    `newModel` - a `ListSelectionModel` object
  See Also:
    `getSelectionModel()`

### getSelectionModel

    public ListSelectionModel getSelectionModel()

  Returns the current selection model.

  Returns:
    a `ListSelectionModel` object
  See Also:
    `setSelectionModel(javax.swing.ListSelectionModel)`

### addColumnModelListener

    public void addColumnModelListener(TableColumnModelListener x)

  Adds a listener for table column model events.

  Parameters:
    `x` - a `TableColumnModelListener` object

### removeColumnModelListener

    public void removeColumnModelListener(TableColumnModelListener x)

  Removes a listener for table column model events.

  Parameters:
    `x` - a `TableColumnModelListener` object

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