org.metawidget.swing.layout.GroupLayout Maven / Gradle / Ivy
// Metawidget
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package org.metawidget.swing.layout;
import static org.metawidget.inspector.InspectionResultConstants.*;
import java.awt.Component;
import java.util.List;
import java.util.Map;
import javax.swing.GroupLayout.Alignment;
import javax.swing.GroupLayout.ParallelGroup;
import javax.swing.GroupLayout.SequentialGroup;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import org.metawidget.layout.iface.AdvancedLayout;
import org.metawidget.swing.Facet;
import org.metawidget.swing.Stub;
import org.metawidget.swing.SwingMetawidget;
import org.metawidget.util.CollectionUtils;
import org.metawidget.util.simple.Pair;
import org.metawidget.util.simple.SimpleLayoutUtils;
/**
* Layout to arrange widgets using javax.swing.GroupLayout.
*
* Widgets are arranged in a table, with one column for labels and another for the widget.
*
* @author Richard Kennard
*/
public class GroupLayout
implements AdvancedLayout {
//
// Private statics
//
private static final Component[] EMPTY_COMPONENTS_ARRAY = new Component[] {};
private static final int COMPONENT_GAP = 3;
private static final String LABEL_NAME_SUFFIX = "_label";
//
// Public methods
//
@Override
public void onStartBuild( SwingMetawidget metawidget ) {
// Do nothing
}
@Override
public void startContainerLayout( JComponent container, SwingMetawidget metawidget ) {
javax.swing.GroupLayout groupLayout = new javax.swing.GroupLayout( container );
container.setLayout( groupLayout );
// Horizontal group
container.putClientProperty( GroupLayout.class, null );
State state = getState( container );
state.groupHorizontal = groupLayout.createParallelGroup();
groupLayout.setHorizontalGroup( state.groupHorizontal );
state.labels = CollectionUtils.newArrayList();
// Vertical group
state.groupVertical = groupLayout.createSequentialGroup();
groupLayout.setVerticalGroup( state.groupVertical );
}
@Override
public void layoutWidget( JComponent component, String elementName, Map attributes, JComponent container, SwingMetawidget metawidget ) {
// Do not render empty stubs
if ( component instanceof Stub && ( (Stub) component ).getComponentCount() == 0 ) {
return;
}
javax.swing.GroupLayout groupLayout = (javax.swing.GroupLayout) container.getLayout();
SequentialGroup sequentialGroup = groupLayout.createSequentialGroup();
ParallelGroup parallelGroup = groupLayout.createParallelGroup( Alignment.BASELINE );
State state = getState( container );
state.groupHorizontal.addGroup( sequentialGroup );
state.groupVertical.addGap( COMPONENT_GAP, COMPONENT_GAP, COMPONENT_GAP );
state.groupVertical.addGroup( parallelGroup );
// Label
if ( attributes != null ) {
String labelText = metawidget.getLabelString( attributes );
if ( SimpleLayoutUtils.needsLabel( labelText, elementName ) ) {
JLabel label = new JLabel();
label.setName( attributes.get( NAME ) + LABEL_NAME_SUFFIX );
// Required
Pair stripMnemonic = SimpleLayoutUtils.stripMnemonic( labelText );
String labelTextToUse = stripMnemonic.getLeft();
if ( TRUE.equals( attributes.get( REQUIRED ) ) && !TRUE.equals( attributes.get( READ_ONLY ) ) && !metawidget.isReadOnly() ) {
labelTextToUse += "*";
}
label.setText( labelTextToUse + ":" );
// Mnemonic
label.setLabelFor( component );
int mnemonicIndex = stripMnemonic.getRight();
if ( mnemonicIndex != -1 ) {
label.setDisplayedMnemonic( labelTextToUse.charAt( mnemonicIndex ) );
label.setDisplayedMnemonicIndex( mnemonicIndex );
}
// Groups
sequentialGroup.addComponent( label ).addGap( COMPONENT_GAP, COMPONENT_GAP, COMPONENT_GAP );
parallelGroup.addComponent( label );
state.labels.add( label );
}
}
// Component
sequentialGroup.addComponent( component );
parallelGroup.addComponent( component );
}
@Override
public void endContainerLayout( JComponent container, SwingMetawidget metawidget ) {
// Make all labels the same width
State state = getState( container );
javax.swing.GroupLayout groupLayout = (javax.swing.GroupLayout) container.getLayout();
if ( !state.labels.isEmpty() ) {
groupLayout.linkSize( SwingConstants.HORIZONTAL, state.labels.toArray( EMPTY_COMPONENTS_ARRAY ) );
}
}
@Override
public void onEndBuild( SwingMetawidget metawidget ) {
// Buttons
Facet facetButtons = metawidget.getFacet( "buttons" );
if ( facetButtons != null ) {
State state = getState( metawidget );
javax.swing.GroupLayout groupLayout = (javax.swing.GroupLayout) metawidget.getLayout();
state.groupHorizontal.addGroup( groupLayout.createSequentialGroup().addComponent( facetButtons ) );
state.groupVertical.addGap( COMPONENT_GAP, COMPONENT_GAP, COMPONENT_GAP );
state.groupVertical.addGroup( groupLayout.createParallelGroup( Alignment.BASELINE ).addComponent( facetButtons ) );
}
}
//
// Private methods
//
private State getState( JComponent container ) {
State state = (State) container.getClientProperty( GroupLayout.class );
if ( state == null ) {
state = new State();
container.putClientProperty( GroupLayout.class, state );
}
return state;
}
//
// Inner class
//
/**
* Simple, lightweight structure for saving state.
*/
/* package private */static class State {
/* package private */ParallelGroup groupHorizontal;
/* package private */SequentialGroup groupVertical;
/* package private */List labels;
}
}