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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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 com.vaadin.tests.minitutorials.v7b1;
import com.vaadin.shared.AbstractComponentState;
import com.vaadin.ui.AbstractComponent;
public class Addition extends AbstractComponent {
private int term1;
private int term2;
private boolean needsRecalculation = false;
public void setTerm1(int value1) {
term1 = value1;
needsRecalculation = true;
// Mark the component as dirty to ensure beforeClientResponse will be
// invoked
markAsDirty();
}
public void setTerm2(int value2) {
term2 = value2;
needsRecalculation = true;
// Mark the component as dirty to ensure beforeClientResponse will be
// invoked
markAsDirty();
}
private int calculateSum() {
return term1 + term2;
}
@Override
public void beforeClientResponse(boolean initial) {
super.beforeClientResponse(initial);
if (needsRecalculation) {
needsRecalculation = false;
// This could be an expensive operation that we don't want to do
// every time setTerm1 or setTerm2 is invoked.
getState().sum = calculateSum();
}
}
@Override
protected AddResultState getState() {
return (AddResultState) super.getState();
}
}
class AddResultState extends AbstractComponentState {
public int sum;
}
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