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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.swing;
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.TransformedList;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.RowSpec;
/**
* A panel that shows the contents of an EventList containing JComponents.
*
*
* Extension: JGoodies Forms This Glazed Lists extension requires the third party library JGoodies Forms. Tested Version: 1.0.5 Home page: http://www.jgoodies.com/freeware/forms/ License: BSD
*
* To use {@link JEventListPanel}:
*
* - Create an {@link EventList} of {@link JComponent}s, or any
* objects that reference a set of {@link JComponent}s.
*
- Implement {@link JEventListPanel.Format} for the object's in your
* {@link EventList}. This interface defines how a single cell is layed out.
* Once the layout for a single cell is known, all cells can be tiled to
* show all of the {@link JComponent}s in your {@link EventList}.
*
- Create an {@link JEventListPanel} and add it in your application somewhere.
* If the number of elements in the {@link EventList} may grow unbounded,
* wrap your {@link JEventListPanel} in a {@link JScrollPane}.
*
*
* @author Jesse Wilson
*/
public final class JEventListPanel extends JPanel {
/** the source contains all the JComponents */
private TransformedList swingSource;
/** the components of the panel */
private List components = new ArrayList();
/** the layout supports a forms layout under the hood */
private final ListLayout listLayout;
/** the format specifies what an element cell looks like */
private final Format format;
/** handle changes to the source {@link EventList} */
private final SourceChangeHandler sourceChangeHandler = new SourceChangeHandler();
/**
* Creates a new {@link JEventListPanel} hosting the
* {@link JComponent}s from the specified source {@link EventList}.
*/
public JEventListPanel(EventList source, Format format) {
this.swingSource = GlazedListsSwing.swingThreadProxyList(source);
this.listLayout = new ListLayout(this, format);
this.format = format;
this.setLayout(listLayout);
// populate the initial elements
for(int i = 0; i < swingSource.size(); i++) {
sourceChangeHandler.insert(i);
}
// listen for changes to the source
swingSource.addListEventListener(sourceChangeHandler);
}
/**
* Limit the number of list elements will be layed out along the X axis.
* This is the number of logical columns, which may differ from the layout
* columns used within each cell.
*
* Note that when the columns are limited, rows are automatically unlimited.
*
* @param elementColumns the number of logical columns, between 1 and
* {@link Integer#MAX_VALUE}.
*/
public void setElementColumns(int elementColumns) {
if(elementColumns < 1) throw new IllegalArgumentException("elementColumns must be in the range [1, " + Integer.MAX_VALUE + "]");
listLayout.setElementColumns(elementColumns);
}
/**
* Limit the number of list elements will be layed out along the Y axis.
* This is the number of logical rows, which may differ from the layout
* rows used within each cell.
*
*
Note that when the rows are limited, columns are automatically unlimited.
*
* @param elementRows the number of logical rows, between 1 and
* {@link Integer#MAX_VALUE}.
*/
public void setElementRows(int elementRows) {
if(elementRows < 1) throw new IllegalArgumentException("elementRows must be in the range [1, " + Integer.MAX_VALUE + "]");
listLayout.setElementRows(elementRows);
}
/**
* Provide the binding between this panel and the source {@link EventList}.
*/
private class SourceChangeHandler implements ListEventListener {
/**
* Handle an inserted element.
*/
private void insert(int index) {
// save the components
E element = swingSource.get(index);
JComponent[] elementComponents = new JComponent[format.getComponentsPerElement()];
for(int c = 0; c < elementComponents.length; c++) {
elementComponents[c] = format.getComponent(element, c);
}
// remember these components
components.add(index, elementComponents);
listLayout.insertIndex(index);
// insert the components
for(int c = 0; c < elementComponents.length; c++) {
if(elementComponents[c] == null) continue;
add(elementComponents[c], new ListLayout.Constraints(c, index));
}
}
/**
* Handle a deleted element.
*/
private void delete(int index) {
// remove the components
JComponent[] elementComponents = components.get(index);
for(int c = 0; c < elementComponents.length; c++) {
if(elementComponents[c] == null) continue;
remove(elementComponents[c]);
}
// forget the components
components.remove(index);
// collapse the row from the layout
listLayout.removeIndex(index);
}
/**
* Handle an updated element.
*/
private void update(int index) {
// get the old components
JComponent[] oldElementComponents = components.get(index);
// get the new components
E element = swingSource.get(index);
JComponent[] newElementComponents = new JComponent[format.getComponentsPerElement()];
for(int c = 0; c < newElementComponents.length; c++) {
newElementComponents[c] = format.getComponent(element, c);
}
// swap as necessary
for(int c = 0; c < oldElementComponents.length; c++) {
if(oldElementComponents[c] == newElementComponents[c]) continue;
if(oldElementComponents[c] != null) {
remove(oldElementComponents[c]);
}
if(newElementComponents[c] != null) {
add(newElementComponents[c], new ListLayout.Constraints(c, index));
}
}
// save the latest components
components.set(index, newElementComponents);
// update the row in the layout
listLayout.updateIndex(index);
}
/**
* When the components list changes, this updates the panel.
*/
public void listChanged(ListEvent listChanges) {
while(listChanges.next()) {
int type = listChanges.getType();
int index = listChanges.getIndex();
if(type == ListEvent.INSERT) {
insert(index);
} else if(type == ListEvent.DELETE) {
delete(index);
} else if(type == ListEvent.UPDATE) {
update(index);
}
}
// repaint the panel
revalidate();
repaint();
}
}
/**
* Releases the resources consumed by this {@link JEventListPanel} so that it
* may eventually be garbage collected.
*
* Warning: It is an error
* to call any method on a {@link JEventListPanel} after it has been disposed.
*/
public void dispose() {
swingSource.removeListEventListener(sourceChangeHandler);
swingSource.dispose();
}
/**
* Specify how the JComponents of an Object are layed out in a row.
*/
public interface Format {
/**
* Get the number of components for each row element.
*/
int getComponentsPerElement();
/**
* Get the component from the specified list element.
*/
JComponent getComponent(E element, int component);
/**
* Get the constraints to lay out the specified component.
*
* @param component the component to fetch constraints for.
* @return constraints that specify how to lay out the component.
* The constraints' Y value must be between (baseRow + 1) and
* (baseRow + getElementRows().length + 1) inclusive.
* The constraints' X value must be between 1 and
* (getElementColumns().length + 1) inclusive.
*/
CellConstraints getConstraints(int component);
/**
* Get the RowSpecs required for one element in the list.
*/
RowSpec[] getElementRows();
/**
* Get the ColumnSpecs required for one element in the list.
*/
ColumnSpec[] getElementColumns();
/**
* Get the RowSpec to separate two elements.
*
* @return the RowSpec for the spacer row, or null for
* no gap.
*/
RowSpec getGapRow();
/**
* Get the ColumnSpecs to separate two elements.
*
* @return the ColumnSpec for the spacer column, or null for
* no gap.
*/
ColumnSpec getGapColumn();
}
/**
* A default implementation of the {@link Format} interface.
*/
public static abstract class AbstractFormat implements Format {
private RowSpec[] elementRows;
private ColumnSpec[] elementColumns;
private RowSpec gapRow;
private ColumnSpec gapColumn;
private CellConstraints[] cellConstraints;
/**
* Construct a format using the specifications and constraints specified.
*/
protected AbstractFormat(RowSpec[] rowSpecs, ColumnSpec[] columnSpecs, RowSpec gapRow, ColumnSpec gapColumn, CellConstraints[] cellConstraints) {
this.elementRows = rowSpecs;
this.elementColumns = columnSpecs;
this.gapRow = gapRow;
this.gapColumn = gapColumn;
this.cellConstraints = cellConstraints;
}
/**
* Construct a format using the specifications and constraints specified.
*/
protected AbstractFormat(String rowSpecs, String columnSpecs, String gapRow, String gapColumn, CellConstraints[] cellConstraints) {
this(RowSpec.decodeSpecs(rowSpecs), ColumnSpec.decodeSpecs(columnSpecs), new RowSpec(gapRow), new ColumnSpec(gapColumn), cellConstraints);
}
/**
* Construct a format using the specifications and constraints specified.
*/
protected AbstractFormat(String rowSpecs, String columnSpecs, String gapRow, String gapColumn, String[] cellConstraints) {
this(RowSpec.decodeSpecs(rowSpecs), ColumnSpec.decodeSpecs(columnSpecs), gapRow == null ? null : new RowSpec(gapRow), gapColumn == null ? null : new ColumnSpec(gapColumn), decode(cellConstraints));
}
/**
* Construct a bare format. Extending classes must populate all specs
* or override the corresponding getters so that all appropriate
* specifications are available.
*/
protected AbstractFormat() {
// do nothing
}
/** {@inheritDoc} */
public RowSpec[] getElementRows() {
return elementRows;
}
/**
* Set the rows used for a single element cell.
*/
public void setElementRows(RowSpec[] elementRows) {
this.elementRows = elementRows;
}
/** {@inheritDoc} */
public ColumnSpec[] getElementColumns() {
return elementColumns;
}
/**
* Set the columns used for a single element cell.
*/
public void setElementColumns(ColumnSpec[] elementColumns) {
this.elementColumns = elementColumns;
}
/**
* Set the rows and columns used for a single element cell.
*/
public void setElementCells(String rowSpecs, String columnSpecs) {
this.setElementRows(RowSpec.decodeSpecs(rowSpecs));
this.setElementColumns(ColumnSpec.decodeSpecs(columnSpecs));
}
/** {@inheritDoc} */
public int getComponentsPerElement() {
return cellConstraints.length;
}
/** {@inheritDoc} */
public CellConstraints getConstraints(int component) {
return cellConstraints[component];
}
/**
* Set the constraints used for the components of each element.
*/
public void setCellConstraints(CellConstraints[] cellConstraints) {
this.cellConstraints = cellConstraints;
}
/**
* Set the constraints used for the components of each element.
*/
public void setCellConstraints(String[] cellConstraints) {
setCellConstraints(decode(cellConstraints));
}
/** {@inheritDoc} */
public RowSpec getGapRow() {
return gapRow;
}
/** {@inheritDoc} */
public ColumnSpec getGapColumn() {
return gapColumn;
}
/**
* Set the height of the vertical gap between element cells.
*/
public void setGapRow(RowSpec gapRow) {
this.gapRow = gapRow;
}
/**
* Set the width of the horizontal gap between element cells.
*/
public void setGapColumn(ColumnSpec gapColumn) {
this.gapColumn = gapColumn;
}
/**
* Set the size of the gaps between element cells.
*/
public void setGaps(String gapRow, String gapColumn) {
this.setGapRow(gapRow != null ? new RowSpec(gapRow) : null);
this.setGapColumn(gapColumn != null ? new ColumnSpec(gapColumn) : null);
}
/**
* Decode the specified Strings into cell constraints.
*/
private static CellConstraints[] decode(String[] cellConstraints) {
CellConstraints[] decoded = new CellConstraints[cellConstraints.length];
for(int c = 0; c < cellConstraints.length; c++) {
decoded[c] = new CellConstraints(cellConstraints[c]);
}
return decoded;
}
}
}