org.metawidget.gwt.client.widgetbuilder.GwtWidgetBuilder Maven / Gradle / Ivy
// Metawidget (licensed under LGPL)
//
// 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.gwt.client.widgetbuilder;
import static org.metawidget.inspector.InspectionResultConstants.*;
import java.util.Date;
import java.util.List;
import java.util.Map;
import org.metawidget.gwt.client.ui.GwtMetawidget;
import org.metawidget.gwt.client.ui.GwtUtils;
import org.metawidget.gwt.client.ui.GwtValueAccessor;
import org.metawidget.gwt.client.ui.Stub;
import org.metawidget.util.simple.StringUtils;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.HasText;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;
/**
* WidgetBuilder for GWT environments.
*
* Creates native GWT Widgets, such as TextBox and ListBox, to suit the
* inspected fields.
*
* @author Richard Kennard
*/
public class GwtWidgetBuilder
implements WidgetBuilder, GwtValueAccessor {
//
// Public methods
//
public Object getValue( Widget widget ) {
// CheckBox (must come before HasText, because CheckBox extends
// ButtonBase which implements HasHTML which extends HasText)
if ( widget instanceof CheckBox ) {
return ( (CheckBox) widget ).getValue();
}
// HasText
if ( widget instanceof HasText ) {
return ( (HasText) widget ).getText();
}
// ListBox
if ( widget instanceof ListBox ) {
ListBox listBox = (ListBox) widget;
return listBox.getValue( listBox.getSelectedIndex() );
}
return null;
}
public boolean setValue( Widget widget, Object value ) {
// CheckBox (must come before HasText, because CheckBox extends
// ButtonBase which implements HasHTML which extends HasText)
if ( widget instanceof CheckBox ) {
( (CheckBox) widget ).setValue( (Boolean) value );
return true;
}
// HasText
if ( widget instanceof HasText ) {
( (HasText) widget ).setText( StringUtils.quietValueOf( value ) );
return true;
}
// ListBox
if ( widget instanceof ListBox ) {
GwtUtils.setListBoxSelectedItem( (ListBox) widget, StringUtils.quietValueOf( value ) );
return true;
}
// Not for us
return false;
}
public Widget buildWidget( String elementName, Map attributes, GwtMetawidget metawidget ) {
// Hidden
if ( TRUE.equals( attributes.get( HIDDEN ) ) ) {
return new Stub();
}
// Action
if ( ACTION.equals( elementName ) ) {
return new Button( metawidget.getLabelString( attributes ) );
}
String type = GwtUtils.getActualClassOrType( attributes );
// If no type, assume a String
if ( type == null ) {
type = String.class.getName();
}
// Support mandatory Booleans (can be rendered as a checkbox, even though they have a
// Lookup)
if ( "Boolean".equals( type ) && TRUE.equals( attributes.get( REQUIRED ) ) ) {
return new CheckBox();
}
// Lookups
String lookup = attributes.get( LOOKUP );
if ( lookup != null && !"".equals( lookup ) ) {
ListBox listBox = new ListBox();
listBox.setVisibleItemCount( 1 );
addListBoxItems( listBox, GwtUtils.fromString( lookup, StringUtils.SEPARATOR_COMMA_CHAR ), GwtUtils.fromString( attributes.get( LOOKUP_LABELS ), StringUtils.SEPARATOR_COMMA_CHAR ), attributes );
return listBox;
}
if ( GwtUtils.isPrimitive( type ) ) {
// booleans
if ( "boolean".equals( type ) ) {
return new CheckBox();
}
// chars
if ( "char".equals( type ) ) {
TextBox textbox = new TextBox();
textbox.setMaxLength( 1 );
return textbox;
}
// Everything else
return new TextBox();
}
// Strings
if ( String.class.getName().equals( type ) ) {
if ( TRUE.equals( attributes.get( MASKED ) ) ) {
return new PasswordTextBox();
}
if ( TRUE.equals( attributes.get( LARGE ) ) ) {
return new TextArea();
}
TextBox textBox = new TextBox();
String maximumLength = attributes.get( MAXIMUM_LENGTH );
if ( maximumLength != null && !"".equals( maximumLength ) ) {
textBox.setMaxLength( Integer.parseInt( maximumLength ) );
}
return textBox;
}
// Dates
if ( Date.class.getName().equals( type ) ) {
return new TextBox();
}
if ( GwtUtils.isPrimitiveWrapper( type ) ) {
// Characters
if ( Character.class.getName().equals( type ) ) {
TextBox textbox = new TextBox();
textbox.setMaxLength( 1 );
return textbox;
}
// Numbers
return new TextBox();
}
// Collections
if ( GwtUtils.isCollection( type ) ) {
return new Stub();
}
// Not simple, but don't expand
if ( TRUE.equals( attributes.get( DONT_EXPAND ) ) ) {
return new TextBox();
}
// Nested Metawidget
return null;
}
//
// Private methods
//
private void addListBoxItems( ListBox listBox, List values, List labels, Map attributes ) {
if ( values == null ) {
return;
}
// Empty option
//
// Note: GWT doesn't seem to be able to set null for the
// value. It always comes back as String "null"
if ( GwtUtils.needsEmptyLookupItem( attributes ) ) {
addListBoxItem( listBox, "", null );
}
// See if we're using labels
if ( labels != null && !labels.isEmpty() && labels.size() != values.size() ) {
throw new RuntimeException( "Labels list must be same size as values list" );
}
// Add the select items
for ( int loop = 0, length = values.size(); loop < length; loop++ ) {
String value = values.get( loop );
String label = null;
if ( labels != null && !labels.isEmpty() ) {
label = labels.get( loop );
}
addListBoxItem( listBox, value, label );
}
}
private void addListBoxItem( ListBox listBox, String value, String label ) {
if ( label != null ) {
listBox.addItem( label, value );
return;
}
listBox.addItem( value );
}
}