The TableColumn.java Java example source code
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing.table;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.SwingPropertyChangeSupport;
import java.lang.Integer;
import java.awt.Color;
import java.awt.Component;
import java.io.Serializable;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
/**
* A <code>TableColumn represents all the attributes of a column in a
* <code>JTable, such as width, resizability, minimum and maximum width.
* In addition, the <code>TableColumn provides slots for a renderer and
* an editor that can be used to display and edit the values in this column.
* <p>
* It is also possible to specify renderers and editors on a per type basis
* rather than a per column basis - see the
* <code>setDefaultRenderer method in the JTable class.
* This default mechanism is only used when the renderer (or
* editor) in the <code>TableColumn is null.
* <p>
* The <code>TableColumn stores the link between the columns in the
* <code>JTable and the columns in the TableModel.
* The <code>modelIndex is the column in the
* <code>TableModel, which will be queried for the data values for the
* cells in this column. As the column moves around in the view this
* <code>modelIndex does not change.
* <p>
* <b>Note: Some implementations may assume that all
* <code>TableColumnModels are unique, therefore we would
* recommend that the same <code>TableColumn instance
* not be added more than once to a <code>TableColumnModel.
* To show <code>TableColumns with the same column of
* data from the model, create a new instance with the same
* <code>modelIndex.
* <p>
* <strong>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 <code>java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Alan Chung
* @author Philip Milne
* @see javax.swing.table.TableColumnModel
*
* @see javax.swing.table.DefaultTableColumnModel
* @see javax.swing.table.JTableHeader#getDefaultRenderer()
* @see JTable#getDefaultRenderer(Class)
* @see JTable#getDefaultEditor(Class)
* @see JTable#getCellRenderer(int, int)
* @see JTable#getCellEditor(int, int)
*/
public class TableColumn extends Object implements Serializable {
/**
* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
* properties.
*/
/*
* Warning: The value of this constant, "columWidth" is wrong as the
* name of the property is "columnWidth".
*/
public final static String COLUMN_WIDTH_PROPERTY = "columWidth";
/**
* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
* properties.
*/
public final static String HEADER_VALUE_PROPERTY = "headerValue";
/**
* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
* properties.
*/
public final static String HEADER_RENDERER_PROPERTY = "headerRenderer";
/**
* Obsolete as of Java 2 platform v1.3. Please use string literals to identify
* properties.
*/
public final static String CELL_RENDERER_PROPERTY = "cellRenderer";
//
// Instance Variables
//
/**
* The index of the column in the model which is to be displayed by
* this <code>TableColumn. As columns are moved around in the
* view <code>modelIndex remains constant.
*/
protected int modelIndex;
/**
* This object is not used internally by the drawing machinery of
* the <code>JTable; identifiers may be set in the
* <code>TableColumn as as an
* optional way to tag and locate table columns. The table package does
* not modify or invoke any methods in these identifier objects other
* than the <code>equals method which is used in the
* <code>getColumnIndex() method in the
* <code>DefaultTableColumnModel.
*/
protected Object identifier;
/** The width of the column. */
protected int width;
/** The minimum width of the column. */
protected int minWidth;
/** The preferred width of the column. */
private int preferredWidth;
/** The maximum width of the column. */
protected int maxWidth;
/** The renderer used to draw the header of the column. */
protected TableCellRenderer headerRenderer;
/** The header value of the column. */
protected Object headerValue;
/** The renderer used to draw the data cells of the column. */
protected TableCellRenderer cellRenderer;
/** The editor used to edit the data cells of the column. */
protected TableCellEditor cellEditor;
/** If true, the user is allowed to resize the column; the default is true. */
protected boolean isResizable;
/**
* This field was not used in previous releases and there are
* currently no plans to support it in the future.
*
* @deprecated as of Java 2 platform v1.3
*/
/*
* Counter used to disable posting of resizing notifications until the
* end of the resize.
*/
@Deprecated
transient protected int resizedPostingDisableCount;
/**
* If any <code>PropertyChangeListeners have been registered, the
* <code>changeSupport field describes them.
*/
private SwingPropertyChangeSupport changeSupport;
//
// Constructors
//
/**
* Cover method, using a default model index of 0,
* default width of 75, a <code>null renderer and a
* <code>null editor.
* This method is intended for serialization.
* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
*/
public TableColumn() {
this(0);
}
/**
* Cover method, using a default width of 75, a <code>null
* renderer and a <code>null editor.
* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
*/
public TableColumn(int modelIndex) {
this(modelIndex, 75, null, null);
}
/**
* Cover method, using a <code>null renderer and a
* <code>null editor.
* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
*/
public TableColumn(int modelIndex, int width) {
this(modelIndex, width, null, null);
}
/**
* Creates and initializes an instance of
* <code>TableColumn with the specified model index,
* width, cell renderer, and cell editor;
* all <code>TableColumn constructors delegate to this one.
* The value of <code>width is used
* for both the initial and preferred width;
* if <code>width is negative,
* they're set to 0.
* The minimum width is set to 15 unless the initial width is less,
* in which case the minimum width is set to
* the initial width.
*
* <p>
* When the <code>cellRenderer
* or <code>cellEditor parameter is null,
* a default value provided by the <code>JTable
* <code>getDefaultRenderer
* or <code>getDefaultEditor method, respectively,
* is used to
* provide defaults based on the type of the data in this column.
* This column-centric rendering strategy can be circumvented by overriding
* the <code>getCellRenderer methods in JTable.
*
* @param modelIndex the index of the column
* in the model that supplies the data for this column in the table;
* the model index remains the same
* even when columns are reordered in the view
* @param width this column's preferred width and initial width
* @param cellRenderer the object used to render values in this column
* @param cellEditor the object used to edit values in this column
* @see #getMinWidth()
* @see JTable#getDefaultRenderer(Class)
* @see JTable#getDefaultEditor(Class)
* @see JTable#getCellRenderer(int, int)
* @see JTable#getCellEditor(int, int)
*/
public TableColumn(int modelIndex, int width,
TableCellRenderer cellRenderer,
TableCellEditor cellEditor) {
super();
this.modelIndex = modelIndex;
preferredWidth = this.width = Math.max(width, 0);
this.cellRenderer = cellRenderer;
this.cellEditor = cellEditor;
// Set other instance variables to default values.
minWidth = Math.min(15, this.width);
maxWidth = Integer.MAX_VALUE;
isResizable = true;
resizedPostingDisableCount = 0;
headerValue = null;
}
//
// Modifying and Querying attributes
//
private void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
if (changeSupport != null) {
changeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
}
private void firePropertyChange(String propertyName, int oldValue, int newValue) {
if (oldValue != newValue) {
firePropertyChange(propertyName, Integer.valueOf(oldValue), Integer.valueOf(newValue));
}
}
private void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {
if (oldValue != newValue) {
firePropertyChange(propertyName, Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
}
}
/**
* Sets the model index for this column. The model index is the
* index of the column in the model that will be displayed by this
* <code>TableColumn. As the TableColumn
* is moved around in the view the model index remains constant.
* @param modelIndex the new modelIndex
* @beaninfo
* bound: true
* description: The model index.
*/
public void setModelIndex(int modelIndex) {
int old = this.modelIndex;
this.modelIndex = modelIndex;
firePropertyChange("modelIndex", old, modelIndex);
}
/**
* Returns the model index for this column.
* @return the <code>modelIndex property
*/
public int getModelIndex() {
return modelIndex;
}
/**
* Sets the <code>TableColumn's identifier to
* <code>anIdentifier.
* Note: identifiers are not used by the <code>JTable,
* they are purely a
* convenience for the external tagging and location of columns.
*
* @param identifier an identifier for this column
* @see #getIdentifier
* @beaninfo
* bound: true
* description: A unique identifier for this column.
*/
public void setIdentifier(Object identifier) {
Object old = this.identifier;
this.identifier = identifier;
firePropertyChange("identifier", old, identifier);
}
/**
* Returns the <code>identifier object for this column.
* Note identifiers are not used by <code>JTable,
* they are purely a convenience for external use.
* If the <code>identifier is null,
* <code>getIdentifier() returns getHeaderValue
* as a default.
*
* @return the <code>identifier property
* @see #setIdentifier
*/
public Object getIdentifier() {
return (identifier != null) ? identifier : getHeaderValue();
}
/**
* Sets the <code>Object whose string representation will be
* used as the value for the <code>headerRenderer. When the
* <code>TableColumn is created, the default headerValue
* is <code>null.
* @param headerValue the new headerValue
* @see #getHeaderValue
* @beaninfo
* bound: true
* description: The text to be used by the header renderer.
*/
public void setHeaderValue(Object headerValue) {
Object old = this.headerValue;
this.headerValue = headerValue;
firePropertyChange("headerValue", old, headerValue);
}
/**
* Returns the <code>Object used as the value for the header
* renderer.
*
* @return the <code>headerValue property
* @see #setHeaderValue
*/
public Object getHeaderValue() {
return headerValue;
}
//
// Renderers and Editors
//
/**
* Sets the <code>TableCellRenderer used to draw the
* <code>TableColumn's header to headerRenderer.
* <p>
* It is the header renderers responsibility to render the sorting
* indicator. If you are using sorting and specify a renderer your
* renderer must render the sorting indication.
*
* @param headerRenderer the new headerRenderer
*
* @see #getHeaderRenderer
* @beaninfo
* bound: true
* description: The header renderer.
*/
public void setHeaderRenderer(TableCellRenderer headerRenderer) {
TableCellRenderer old = this.headerRenderer;
this.headerRenderer = headerRenderer;
firePropertyChange("headerRenderer", old, headerRenderer);
}
/**
* Returns the <code>TableCellRenderer used to draw the header of the
* <code>TableColumn. When the headerRenderer is
* <code>null, the JTableHeader
* uses its <code>defaultRenderer. The default value for a
* <code>headerRenderer is null.
*
* @return the <code>headerRenderer property
* @see #setHeaderRenderer
* @see #setHeaderValue
* @see javax.swing.table.JTableHeader#getDefaultRenderer()
*/
public TableCellRenderer getHeaderRenderer() {
return headerRenderer;
}
/**
* Sets the <code>TableCellRenderer used by JTable
* to draw individual values for this column.
*
* @param cellRenderer the new cellRenderer
* @see #getCellRenderer
* @beaninfo
* bound: true
* description: The renderer to use for cell values.
*/
public void setCellRenderer(TableCellRenderer cellRenderer) {
TableCellRenderer old = this.cellRenderer;
this.cellRenderer = cellRenderer;
firePropertyChange("cellRenderer", old, cellRenderer);
}
/**
* Returns the <code>TableCellRenderer used by the
* <code>JTable to draw
* values for this column. The <code>cellRenderer of the column
* not only controls the visual look for the column, but is also used to
* interpret the value object supplied by the <code>TableModel.
* When the <code>cellRenderer is null,
* the <code>JTable uses a default renderer based on the
* class of the cells in that column. The default value for a
* <code>cellRenderer is null.
*
* @return the <code>cellRenderer property
* @see #setCellRenderer
* @see JTable#setDefaultRenderer
*/
public TableCellRenderer getCellRenderer() {
return cellRenderer;
}
/**
* Sets the editor to used by when a cell in this column is edited.
*
* @param cellEditor the new cellEditor
* @see #getCellEditor
* @beaninfo
* bound: true
* description: The editor to use for cell values.
*/
public void setCellEditor(TableCellEditor cellEditor){
TableCellEditor old = this.cellEditor;
this.cellEditor = cellEditor;
firePropertyChange("cellEditor", old, cellEditor);
}
/**
* Returns the <code>TableCellEditor used by the
* <code>JTable to edit values for this column. When the
* <code>cellEditor is null, the JTable
* uses a default editor based on the
* class of the cells in that column. The default value for a
* <code>cellEditor is null.
*
* @return the <code>cellEditor property
* @see #setCellEditor
* @see JTable#setDefaultEditor
*/
public TableCellEditor getCellEditor() {
return cellEditor;
}
/**
* This method should not be used to set the widths of columns in the
* <code>JTable, use setPreferredWidth instead.
* Like a layout manager in the
* AWT, the <code>JTable adjusts a column's width automatically
* whenever the
* table itself changes size, or a column's preferred width is changed.
* Setting widths programmatically therefore has no long term effect.
* <p>
* This method sets this column's width to <code>width.
* If <code>width exceeds the minimum or maximum width,
* it is adjusted to the appropriate limiting value.
* @param width the new width
* @see #getWidth
* @see #setMinWidth
* @see #setMaxWidth
* @see #setPreferredWidth
* @see JTable#doLayout()
* @beaninfo
* bound: true
* description: The width of the column.
*/
public void setWidth(int width) {
int old = this.width;
this.width = Math.min(Math.max(width, minWidth), maxWidth);
firePropertyChange("width", old, this.width);
}
/**
* Returns the width of the <code>TableColumn. The default width is
* 75.
*
* @return the <code>width property
* @see #setWidth
*/
public int getWidth() {
return width;
}
/**
* Sets this column's preferred width to <code>preferredWidth.
* If <code>preferredWidth exceeds the minimum or maximum width,
* it is adjusted to the appropriate limiting value.
* <p>
* For details on how the widths of columns in the <code>JTable
* (and <code>JTableHeader) are calculated from the
* <code>preferredWidth,
* see the <code>doLayout method in JTable.
*
* @param preferredWidth the new preferred width
* @see #getPreferredWidth
* @see JTable#doLayout()
* @beaninfo
* bound: true
* description: The preferred width of the column.
*/
public void setPreferredWidth(int preferredWidth) {
int old = this.preferredWidth;
this.preferredWidth = Math.min(Math.max(preferredWidth, minWidth), maxWidth);
firePropertyChange("preferredWidth", old, this.preferredWidth);
}
/**
* Returns the preferred width of the <code>TableColumn.
* The default preferred width is 75.
*
* @return the <code>preferredWidth property
* @see #setPreferredWidth
*/
public int getPreferredWidth() {
return preferredWidth;
}
/**
* Sets the <code>TableColumn's minimum width to
* <code>minWidth,
* adjusting the new minimum width if necessary to ensure that
* 0 <= <code>minWidth <= maxWidth.
* For example, if the <code>minWidth argument is negative,
* this method sets the <code>minWidth property to 0.
*
* <p>
* If the value of the
* <code>width or preferredWidth property
* is less than the new minimum width,
* this method sets that property to the new minimum width.
*
* @param minWidth the new minimum width
* @see #getMinWidth
* @see #setPreferredWidth
* @see #setMaxWidth
* @beaninfo
* bound: true
* description: The minimum width of the column.
*/
public void setMinWidth(int minWidth) {
int old = this.minWidth;
this.minWidth = Math.max(Math.min(minWidth, maxWidth), 0);
if (width < this.minWidth) {
setWidth(this.minWidth);
}
if (preferredWidth < this.minWidth) {
setPreferredWidth(this.minWidth);
}
firePropertyChange("minWidth", old, this.minWidth);
}
/**
* Returns the minimum width for the <code>TableColumn. The
* <code>TableColumn's width can't be made less than this either
* by the user or programmatically.
*
* @return the <code>minWidth property
* @see #setMinWidth
* @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
*/
public int getMinWidth() {
return minWidth;
}
/**
* Sets the <code>TableColumn's maximum width to
* <code>maxWidth or,
* if <code>maxWidth is less than the minimum width,
* to the minimum width.
*
* <p>
* If the value of the
* <code>width or preferredWidth property
* is more than the new maximum width,
* this method sets that property to the new maximum width.
*
* @param maxWidth the new maximum width
* @see #getMaxWidth
* @see #setPreferredWidth
* @see #setMinWidth
* @beaninfo
* bound: true
* description: The maximum width of the column.
*/
public void setMaxWidth(int maxWidth) {
int old = this.maxWidth;
this.maxWidth = Math.max(minWidth, maxWidth);
if (width > this.maxWidth) {
setWidth(this.maxWidth);
}
if (preferredWidth > this.maxWidth) {
setPreferredWidth(this.maxWidth);
}
firePropertyChange("maxWidth", old, this.maxWidth);
}
/**
* Returns the maximum width for the <code>TableColumn. The
* <code>TableColumn's width can't be made larger than this
* either by the user or programmatically. The default maxWidth
* is Integer.MAX_VALUE.
*
* @return the <code>maxWidth property
* @see #setMaxWidth
*/
public int getMaxWidth() {
return maxWidth;
}
/**
* Sets whether this column can be resized.
*
* @param isResizable if true, resizing is allowed; otherwise false
* @see #getResizable
* @beaninfo
* bound: true
* description: Whether or not this column can be resized.
*/
public void setResizable(boolean isResizable) {
boolean old = this.isResizable;
this.isResizable = isResizable;
firePropertyChange("isResizable", old, this.isResizable);
}
/**
* Returns true if the user is allowed to resize the
* <code>TableColumn's
* width, false otherwise. You can change the width programmatically
* regardless of this setting. The default is true.
*
* @return the <code>isResizable property
* @see #setResizable
*/
public boolean getResizable() {
return isResizable;
}
/**
* Resizes the <code>TableColumn to fit the width of its header cell.
* This method does nothing if the header renderer is <code>null
* (the default case). Otherwise, it sets the minimum, maximum and preferred
* widths of this column to the widths of the minimum, maximum and preferred
* sizes of the Component delivered by the header renderer.
* The transient "width" property of this TableColumn is also set to the
* preferred width. Note this method is not used internally by the table
* package.
*
* @see #setPreferredWidth
*/
public void sizeWidthToFit() {
if (headerRenderer == null) {
return;
}
Component c = headerRenderer.getTableCellRendererComponent(null,
getHeaderValue(), false, false, 0, 0);
setMinWidth(c.getMinimumSize().width);
setMaxWidth(c.getMaximumSize().width);
setPreferredWidth(c.getPreferredSize().width);
setWidth(getPreferredWidth());
}
/**
* This field was not used in previous releases and there are
* currently no plans to support it in the future.
*
* @deprecated as of Java 2 platform v1.3
*/
@Deprecated
public void disableResizedPosting() {
resizedPostingDisableCount++;
}
/**
* This field was not used in previous releases and there are
* currently no plans to support it in the future.
*
* @deprecated as of Java 2 platform v1.3
*/
@Deprecated
public void enableResizedPosting() {
resizedPostingDisableCount--;
}
//
// Property Change Support
//
/**
* Adds a <code>PropertyChangeListener to the listener list.
* The listener is registered for all properties.
* <p>
* A <code>PropertyChangeEvent will get fired in response to an
* explicit call to <code>setFont, setBackground,
* or <code>setForeground on the
* current component. Note that if the current component is
* inheriting its foreground, background, or font from its
* container, then no event will be fired in response to a
* change in the inherited property.
*
* @param listener the listener to be added
*
*/
public synchronized void addPropertyChangeListener(
PropertyChangeListener listener) {
if (changeSupport == null) {
changeSupport = new SwingPropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(listener);
}
/**
* Removes a <code>PropertyChangeListener from the listener list.
* The <code>PropertyChangeListener to be removed was registered
* for all properties.
*
* @param listener the listener to be removed
*
*/
public synchronized void removePropertyChangeListener(
PropertyChangeListener listener) {
if (changeSupport != null) {
changeSupport.removePropertyChangeListener(listener);
}
}
/**
* Returns an array of all the <code>PropertyChangeListeners added
* to this TableColumn with addPropertyChangeListener().
*
* @return all of the <code>PropertyChangeListeners added or an empty
* array if no listeners have been added
* @since 1.4
*/
public synchronized PropertyChangeListener[] getPropertyChangeListeners() {
if (changeSupport == null) {
return new PropertyChangeListener[0];
}
return changeSupport.getPropertyChangeListeners();
}
//
// Protected Methods
//
/**
* As of Java 2 platform v1.3, this method is not called by the <code>TableColumn
* constructor. Previously this method was used by the
* <code>TableColumn to create a default header renderer.
* As of Java 2 platform v1.3, the default header renderer is <code>null.
* <code>JTableHeader now provides its own shared default
* renderer, just as the <code>JTable does for its cell renderers.
*
* @return the default header renderer
* @see javax.swing.table.JTableHeader#createDefaultRenderer()
*/
protected TableCellRenderer createDefaultHeaderRenderer() {
DefaultTableCellRenderer label = new DefaultTableCellRenderer() {
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (table != null) {
JTableHeader header = table.getTableHeader();
if (header != null) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
}
setText((value == null) ? "" : value.toString());
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
};
label.setHorizontalAlignment(JLabel.CENTER);
return label;
}
} // End of class TableColumn
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