org.jdesktop.swingx.table
Class ColumnFactory

java.lang.Object
  org.jdesktop.swingx.table.ColumnFactory

public class ColumnFactory
extends Object

Creates and configures TableColumnExts.

TODO JW: explain types of configuration - initial from tableModel, initial from table context, user triggered at runtime.

JXTable delegates all TableColumn creation and configuration to a ColumnFactory. Enhanced column configuration should be implemented in a custom factory subclass. The example beautifies the column titles to always start with a capital letter:

 
    MyColumnFactory extends ColumnFactory {
        //@Override
        public void configureTableColumn(TableModel model, 
            TableColumnExt columnExt) {
            super.configureTableColumn(model, columnExt);
            String title = columnExt.getTitle();
            title = title.substring(0,1).toUpperCase() + title.substring(1).toLowerCase();
            columnExt.setTitle(title);
        }
    };
 
 

By default a single instance is shared across all tables of an application. This instance can be replaced by a custom implementation, preferably "early" in the application's lifetime.

 ColumnFactory.setInstance(new MyColumnFactory());
 

Alternatively, any instance of JXTable can be configured individually with its own ColumnFactory.

  
 JXTable table = new JXTable();
 table.setColumnFactory(new MyColumnFactory());
 table.setModel(myTableModel);
 
  

See Also:

JXTable.setColumnFactory(ColumnFactory)

Constructor Summary

ColumnFactory()

Method Summary

protected int	calcHeaderWidth(JXTable table, TableColumnExt columnExt) Measures and returns the preferred width of the header.
protected int	calcPrototypeWidth(JXTable table, TableColumnExt columnExt) Measures and returns the preferred width of the rendering component configured with the prototype value, if any.
void	configureColumnWidths(JXTable table, TableColumnExt columnExt) Configures column initial widths properties from JXTable.
void	configureTableColumn(TableModel model, TableColumnExt columnExt) Configure column properties from TableModel.
TableColumnExt	createAndConfigureTableColumn(TableModel model, int modelIndex) Creates and configures a TableColumnExt.
TableColumnExt	createTableColumn(int modelIndex) Creates a table column with modelIndex.
protected TableCellRenderer	getCellRenderer(JXTable table, TableColumnExt columnExt) Returns the cell renderer to use for measuring.
int	getDefaultPackMargin() Returns the default pack margin.
protected TableCellRenderer	getHeaderRenderer(JXTable table, TableColumnExt columnExt) Looks up and returns the renderer used for the column's header.
static ColumnFactory	getInstance() Returns the shared default factory.
int	getPreferredScrollableViewportWidth(JXTable table) Calculates and returns the preferred scrollable viewport width of the given table.
protected int	getRowCount(JXTable table) Returns the number of table view rows accessible during row-related config.
void	packColumn(JXTable table, TableColumnExt columnExt, int margin, int max) Configures the column's preferredWidth to fit the content.
void	setDefaultPackMargin(int margin) Sets the default pack margin.
static void	setInstance(ColumnFactory factory) Sets the shared default factory.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnFactory

public ColumnFactory()

Method Detail

getInstance

public static ColumnFactory getInstance()

Returns the shared default factory.

Returns:

the shared instance of ColumnFactory

See Also:

setInstance(ColumnFactory)

setInstance

public static void setInstance(ColumnFactory factory)

Sets the shared default factory. The shared instance is used by JXTable if none has been set individually.

Parameters:

factory - the default column factory.

See Also:

getInstance(), JXTable.getColumnFactory()

createAndConfigureTableColumn

public TableColumnExt createAndConfigureTableColumn(TableModel model,
                                                    int modelIndex)

Creates and configures a TableColumnExt. JXTable calls this method for each column in the TableModel.

Parameters:

model - the TableModel to read configuration properties from

modelIndex - column index in model coordinates

Returns:

a TableColumnExt to use for the modelIndex

Throws:

NPE - if model == null

IllegalStateException - if the modelIndex is invalid (in coordinate space of the tablemodel)

See Also:

createTableColumn(int), configureTableColumn(TableModel, TableColumnExt), JXTable.createDefaultColumnsFromModel()

createTableColumn

public TableColumnExt createTableColumn(int modelIndex)

Creates a table column with modelIndex.

The factory's column creation is passed through this method, so subclasses can override to return custom column types.

Parameters:

modelIndex - column index in model coordinates

Returns:

a TableColumnExt with modelIndex

See Also:

createAndConfigureTableColumn(TableModel, int)

configureTableColumn

public void configureTableColumn(TableModel model,
                                 TableColumnExt columnExt)

Configure column properties from TableModel. This implementation sets the column's headerValue property from the model's columnName.

The factory's initial column configuration is passed through this method, so subclasses can override to customize.

Parameters:

model - the TableModel to read configuration properties from

columnExt - the TableColumnExt to configure.

Throws:

NullPointerException - if model or column == null

IllegalStateException - if column does not have valid modelIndex (in coordinate space of the tablemodel)

See Also:

createAndConfigureTableColumn(TableModel, int)

configureColumnWidths

public void configureColumnWidths(JXTable table,
                                  TableColumnExt columnExt)

Configures column initial widths properties from JXTable. This implementation sets the column's preferredWidth with the strategy:

if the column has a prototype, measure the rendering component with the prototype as value and use that as pref width
if the column has no prototype, use the standard magic pref width (= 75)
try to measure the column's header and use it's preferred width if it exceeds the former.
TODO JW - rename method to better convey what's happening, maybe initializeColumnWidths like the old method in JXTable.

TODO JW - how to handle default settings which are different from standard 75?

Parameters:

table - the context the column will live in.

columnExt - the Tablecolumn to configure.

See Also:

JXTable.getPreferredScrollableViewportSize()

getPreferredScrollableViewportWidth

public int getPreferredScrollableViewportWidth(JXTable table)

Calculates and returns the preferred scrollable viewport width of the given table. Subclasses are free to override and implement a custom strategy.

This implementation sums the pref widths of the first visibleColumnCount contained visible tableColumns. If the table contains less columns, the standard preferred width per column is added to the result.

Parameters:

table - the table containing the columns

calcHeaderWidth

protected int calcHeaderWidth(JXTable table,
                              TableColumnExt columnExt)

Measures and returns the preferred width of the header. Returns -1 if not applicable.

Parameters:

table - the component the renderer lives in

columnExt - the TableColumn to configure

Returns:

the preferred width of the header or -1 if none.

calcPrototypeWidth

protected int calcPrototypeWidth(JXTable table,
                                 TableColumnExt columnExt)

Measures and returns the preferred width of the rendering component configured with the prototype value, if any. Returns -1 if not applicable.

Parameters:

table - the component the renderer lives in

columnExt - the TableColumn to configure

Returns:

the preferred width of the prototype or -1 if none.

getCellRenderer

protected TableCellRenderer getCellRenderer(JXTable table,
                                            TableColumnExt columnExt)

Returns the cell renderer to use for measuring. Delegates to JXTable for visible columns, duplicates table logic for hidden columns.

Parameters:

table - the table which provides the renderer

columnExt - the TableColumn to configure

Returns:

returns a cell renderer for measuring.

getHeaderRenderer

protected TableCellRenderer getHeaderRenderer(JXTable table,
                                              TableColumnExt columnExt)

Looks up and returns the renderer used for the column's header.

Parameters:

table - the table which contains the column

columnExt - the column to lookup the header renderer for

Returns:

the renderer for the columns header, may be null.

packColumn

public void packColumn(JXTable table,
                       TableColumnExt columnExt,
                       int margin,
                       int max)

Configures the column's preferredWidth to fit the content. It respects the table context, a margin to add and a maximum width. This is typically called in response to a user gesture to adjust the column's width to the "widest" cell content of a column.

This implementation loops through all rows of the given column and measures the renderers pref width (it's a potential performance sink). Subclasses can override to implement a different strategy.

Note: though 2 * margin is added as spacing, this does not imply a left/right symmetry - it's up to the table to place the renderer and/or the renderer/highlighter to configure a border.

PENDING: support pack for hidden column? This implementation can't handle it! For now, added doc and fail-fast.

Parameters:

table - the context the column will live in.

columnExt - the column to configure.

margin - the extra spacing to add twice, if -1 uses this factories default

max - an upper limit to preferredWidth, -1 is interpreted as no limit

Throws:

IllegalStateException - if column is not visible

See Also:

setDefaultPackMargin(int), JXTable.packTable(int), JXTable.packColumn(int, int)

getRowCount

protected int getRowCount(JXTable table)

Returns the number of table view rows accessible during row-related config. All row-related access is bounded by the value returned from this method. Here: delegates to table.getRowCount().

Subclasses can override to reduce the number (for performance) or support restrictions due to lazy loading, f.i. Implementors must guarantee that view row access with 0 <= row < getRowCount(JXTable) succeeds.

Parameters:

table - the table to access

Returns:

valid rowCount

getDefaultPackMargin

public int getDefaultPackMargin()

Returns the default pack margin.

Returns:

the default pack margin to use in packColumn.

See Also:

setDefaultPackMargin(int)

setDefaultPackMargin

public void setDefaultPackMargin(int margin)

Sets the default pack margin.

Note: this is not really a margin in the sense of symmetrically adding white space to the left/right of a cell's content. It's simply an amount of space which is added twice to the measured widths in packColumn.

Parameters:

margin - the default marging to use in packColumn.

See Also:

getDefaultPackMargin(), packColumn(JXTable, TableColumnExt, int, int)