org.jdesktop.swingx.renderer.DefaultListRenderer Maven / Gradle / Ivy
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/*
* $Id$
*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jdesktop.swingx.renderer;
import java.awt.Component;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
/**
* Adapter to glue SwingX renderer support to core API. It has convenience
* constructors to create a LabelProvider, optionally configured with a
* StringValue and horizontal alignment. Typically, client code does not
* interact with this class except at instantiation time.
*
*
* Note: core DefaultListCellRenderer shows either an icon or the element's
* toString representation, depending on whether or not the given value
* is of type icon or implementors. This renderer's empty/null provider
* constructor takes care of configuring the default provider with a converter
* which mimics that behaviour. When instantiating this renderer with
* any of the constructors which have converters as parameters,
* it's up to the client code to supply the appropriate converter, if needed:
*
*
*
* StringValue sv = new StringValue() {
*
* public String getString(Object value) {
* if (value instanceof Icon) {
* return "";
* }
* return StringValue.TO_STRING.getString(value);
* }
*
* };
* StringValue lv = new MappedValue(sv, IconValue.ICON);
* listRenderer = new DefaultListRenderer(lv, alignment);
*
*
*
*
*
*
* @author Jeanette Winzenburg
*
* @see ComponentProvider
* @see StringValue
* @see IconValue
* @see MappedValue
*
*
*/
public class DefaultListRenderer extends AbstractRenderer
implements ListCellRenderer {
protected ListCellContext cellContext;
/**
* Instantiates a default list renderer with the default component
* provider.
*
*/
public DefaultListRenderer() {
this((ComponentProvider) null);
}
/**
* Instantiates a ListCellRenderer with the given ComponentProvider.
* If the provider is null, creates and uses a default. The default
* provider is of type LabelProvider
*
* Note: the default provider is configured with a custom StringValue
* which behaves exactly as core DefaultListCellRenderer: depending on
* whether or not given value is of type icon or implementors, it shows
* either the icon or the element's toString.
*
* @param componentProvider the provider of the configured component to
* use for cell rendering
*/
public DefaultListRenderer(ComponentProvider componentProvider) {
super(componentProvider);
this.cellContext = new ListCellContext();
}
/**
* Instantiates a default table renderer with a default component controller
* using the given converter.
*
* PENDING JW: how to guarantee core consistent icon handling? Leave to
* client code?
*
* @param converter the converter to use for mapping the content value to a
* String representation.
*
*/
public DefaultListRenderer(StringValue converter) {
this(new LabelProvider(converter));
}
/**
* Instantiates a default list renderer with a default component
* controller using the given converter and horizontal
* alignment.
*
* PENDING JW: how to guarantee core consistent icon handling? Leave to
* client code?
*
*
* @param converter the converter to use for mapping the
* content value to a String representation.
* @param alignment the horizontal alignment.
*/
public DefaultListRenderer(StringValue converter, int alignment) {
this(new LabelProvider(converter, alignment));
}
/**
* Instantiates a default list renderer with default component provider
* using both converters.
*
* @param stringValue the converter to use for the string representation
* @param iconValue the converter to use for the icon representation
*/
public DefaultListRenderer(StringValue stringValue, IconValue iconValue) {
this(new MappedValue(stringValue, iconValue));
}
/**
* Instantiates a default list renderer with default component provider
* using both converters and the given alignment.
*
* @param stringValue the converter to use for the string representation
* @param iconValue the converter to use for the icon representation
* @param alignment the rendering component's horizontal alignment
*/
public DefaultListRenderer(StringValue stringValue, IconValue iconValue,
int alignment) {
this(new MappedValue(stringValue, iconValue), alignment);
}
// -------------- implements javax.swing.table.ListCellRenderer
/**
*
* Returns a configured component, appropriate to render the given
* list cell.
*
* Note: The component's name is set to "List.cellRenderer" for the sake
* of Synth-based LAFs.
*
* @param list the JList to render on
* @param value the value to assign to the cell
* @param isSelected true if cell is selected
* @param cellHasFocus true if cell has focus
* @param index the row index (in view coordinates) of the cell to render
* @return a component to render the given list cell.
*/
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
cellContext.installContext(list, value, index, 0, isSelected,
cellHasFocus, true, true);
Component comp = componentController.getRendererComponent(cellContext);
// fix issue #1040-swingx: memory leak if value not released
cellContext.replaceValue(null);
return comp;
}
/**
* {@inheritDoc}
*/
@Override
protected ComponentProvider createDefaultComponentProvider() {
return new LabelProvider(createDefaultStringValue());
}
/**
* Creates and returns the default StringValue for a JList.
* This is added to keep consistent with core list rendering which
* shows either the Icon (for Icon value types) or the default
* to-string for non-icon types.
*
* @return the StringValue to use by default.
*/
private StringValue createDefaultStringValue() {
return MappedValues.STRING_OR_ICON_ONLY;
}
}