Package 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);
Author:
Jeanette Winzenburg, M.Hillary (the pack code)
See Also:

  • Constructor Details

    • ColumnFactory

      public ColumnFactory()

  • Method Details

    • getInstance

      public static ColumnFactory getInstance()
      Returns the shared default factory.
      Returns:
      the shared instance of ColumnFactory
      See Also:

    • 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:

    • 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:
      NullPointerException - if model == null
      IllegalStateException - if the modelIndex is invalid (in coordinate space of the tablemodel)
      See Also:

    • 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:

    • 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:

    • 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:

    • 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
      Returns:
      preferred scrollable viewport width

    • 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:

    • 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

      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: