/*
* Copyright 2011 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.resources.OperatorsCss;
import org.drools.guvnor.client.resources.OperatorsResource;
import org.drools.ide.common.client.modeldriven.brl.HasParameterizedOperator;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.user.client.ui.TextBox;
/**
* A TextBox to handle restricted entry
*/
public abstract class AbstractRestrictedEntryTextBox extends TextBox {
private static final OperatorsResource resources = GWT.create( OperatorsResource.class );
private static final OperatorsCss css = resources.operatorsCss();
protected HasParameterizedOperator hop;
public AbstractRestrictedEntryTextBox(HasParameterizedOperator hop,
int index) {
this.hop = hop;
setup( index );
}
private void setup(final int index) {
final TextBox me = this;
this.setStyleName( css.parameter() );
this.addChangeHandler( new ChangeHandler() {
public void onChange(ChangeEvent event) {
hop.setParameter( Integer.toString( index ),
me.getText() );
}
} );
this.addKeyPressHandler( new KeyPressHandler() {
public void onKeyPress(KeyPressEvent event) {
// Permit navigation
int keyCode = event.getNativeEvent().getKeyCode();
if ( event.isControlKeyDown()
|| keyCode == KeyCodes.KEY_BACKSPACE
|| keyCode == KeyCodes.KEY_DELETE
|| keyCode == KeyCodes.KEY_LEFT
|| keyCode == KeyCodes.KEY_RIGHT
|| keyCode == KeyCodes.KEY_TAB ) {
return;
}
// Get new value and validate
int charCode = event.getCharCode();
String oldValue = me.getValue();
String newValue = oldValue.substring( 0,
me.getCursorPos() );
newValue = newValue
+ ((char) charCode);
newValue = newValue
+ oldValue.substring( me.getCursorPos() + me.getSelectionLength() );
if ( !isValidValue( newValue ) ) {
event.preventDefault();
}
}
} );
}
/**
* Validate value of TextBox
*
* @param value
* @return True if valid
*/
protected abstract boolean isValidValue(String value);
}