/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.guvnor.client.modeldriven.ui;
import org.drools.guvnor.client.common.DropDownValueChanged;
import org.drools.guvnor.client.messages.Constants;
import org.drools.ide.common.client.modeldriven.DropDownData;
import org.drools.ide.common.client.modeldriven.SuggestionCompletionEngine;
import org.drools.ide.common.client.modeldriven.brl.BaseSingleFieldConstraint;
import org.drools.ide.common.client.modeldriven.brl.CompositeFieldConstraint;
import org.drools.ide.common.client.modeldriven.brl.ConnectiveConstraint;
import org.drools.ide.common.client.modeldriven.brl.SingleFieldConstraint;
import org.drools.ide.common.client.modeldriven.brl.SingleFieldConstraintEBLeftSide;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.PopupPanel;
public class EnumDropDownLabel extends Composite {
protected Constants constants = ((Constants) GWT.create( Constants.class ));
protected final Label textWidget;
protected final EnumDropDown enumDropDown;
protected final Button okButton;
protected final Panel panel = new HorizontalPanel();
protected final PopupPanel popup;
protected Command onValueChangeCommand;
private String factType;
private CompositeFieldConstraint constraintList;
protected SuggestionCompletionEngine sce;
protected BaseSingleFieldConstraint constraint;
protected boolean enabled;
public EnumDropDownLabel(String factType,
CompositeFieldConstraint constraintList,
SuggestionCompletionEngine sce,
BaseSingleFieldConstraint constraint,
boolean enabled) {
this.factType = factType;
this.constraintList = constraintList;
this.constraint = constraint;
this.sce = sce;
this.enabled = enabled;
textWidget = createTextLabel();
enumDropDown = createEnumDropDown();
okButton = new Button( constants.OK() );
panel.add( textWidget );
updateTextWidget();
updateModel();
popup = createPopup();
initWidget( panel );
}
private void showPopup() {
popup.setPopupPosition( this.getAbsoluteLeft(),
this.getAbsoluteTop() );
//Lazy initialisation of drop-down data as it's content could depend on another drop-down
enumDropDown.setDropDownData( constraint.getValue(),
getDropDownData() );
popup.show();
}
private DropDownData getDropDownData() {
String valueType;
String fieldName;
if ( constraint instanceof SingleFieldConstraintEBLeftSide ) {
SingleFieldConstraintEBLeftSide sfexp = (SingleFieldConstraintEBLeftSide) this.constraint;
fieldName = sfexp.getExpressionLeftSide().getFieldName();
valueType = sfexp.getExpressionLeftSide().getGenericType();
} else if ( constraint instanceof ConnectiveConstraint ) {
ConnectiveConstraint cc = (ConnectiveConstraint) constraint;
fieldName = cc.getFieldName();
valueType = cc.getFieldType();
} else if ( constraint instanceof SingleFieldConstraint ) {
SingleFieldConstraint sfc = (SingleFieldConstraint) this.constraint;
fieldName = sfc.getFieldName();
valueType = sce.getFieldType( factType,
fieldName );
} else {
//TODO {manstis} This should never happen
throw new IllegalArgumentException( "That should not have happened!" );
}
final DropDownData dropDownData;
if ( SuggestionCompletionEngine.TYPE_BOOLEAN.equals( valueType ) ) {
dropDownData = DropDownData.create( new String[]{"true", "false"} ); //NON-NLS
} else {
dropDownData = sce.getEnums( this.factType,
this.constraintList,
fieldName );
}
return dropDownData;
}
private EnumDropDown createEnumDropDown() {
final EnumDropDown box = new EnumDropDown( constraint.getValue(),
new DropDownValueChanged() {
public void valueChanged(String newText,
String newValue) {
constraint.setValue( newValue );
textWidget.setText( newText );
}
},
getDropDownData() );
if ( box.getItemCount() > 6 ) {
box.setVisibleItemCount( 6 );
} else {
box.setVisibleItemCount( box.getItemCount() );
}
box.setEnabled( enabled );
return box;
}
private Label createTextLabel() {
Label label = new Label();
label.setStyleName( "form-field" );
if ( enabled ) {
label.addClickHandler( new ClickHandler() {
public void onClick(ClickEvent event) {
showPopup();
}
} );
}
return label;
}
private PopupPanel createPopup() {
final PopupPanel popup = new PopupPanel();
popup.setGlassEnabled( true );
okButton.addClickHandler( new ClickHandler() {
public void onClick(ClickEvent event) {
executeOnValueChangeCommand();
panel.clear();
panel.add( textWidget );
popup.hide();
}
} );
HorizontalPanel horizontalPanel = new HorizontalPanel();
horizontalPanel.add( enumDropDown );
horizontalPanel.add( okButton );
popup.add( horizontalPanel );
return popup;
}
private void executeOnValueChangeCommand() {
if ( this.onValueChangeCommand != null ) {
this.onValueChangeCommand.execute();
}
}
public void setOnValueChangeCommand(Command onValueChangeCommand) {
this.onValueChangeCommand = onValueChangeCommand;
}
public void refreshDropDownData() {
this.enumDropDown.setDropDownData( constraint.getValue(),
getDropDownData() );
//Copy selections in UI to data-model again, as updating the drop-downs
//can lead to some selected values being cleared when dependent drop-downs
//are used.
updateTextWidget();
updateModel();
}
//Lookup display text from drop-down selection
private void updateTextWidget() {
int index = enumDropDown.getSelectedIndex();
if ( index >= 0 ) {
textWidget.setText( enumDropDown.getItemText( index ) );
}
}
//Lookup model value from drop-down selection
private void updateModel() {
int index = enumDropDown.getSelectedIndex();
if ( index >= 0 ) {
constraint.setValue( enumDropDown.getValue( index ) );
}
}
}