Java tutorial
/******************************************************************************* * Copyright (c) 2008, 2018 Matthew Hall and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * Matthew Hall - initial API and implementation (bug 218269) * Matthew Hall - bug 260329 * Simon Scholz <simon.scholz@vogella.com> - Bug 442278, 434283 ******************************************************************************/ package org.eclipse.jface.examples.databinding.snippets; import java.util.ArrayList; import org.eclipse.core.databinding.DataBindingContext; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.list.IObservableList; import org.eclipse.core.databinding.observable.list.WritableList; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.WritableValue; import org.eclipse.core.databinding.validation.MultiValidator; import org.eclipse.core.databinding.validation.ValidationStatus; import org.eclipse.core.runtime.IStatus; import org.eclipse.jface.databinding.swt.DisplayRealm; import org.eclipse.jface.databinding.swt.typed.WidgetProperties; import org.eclipse.jface.databinding.viewers.ObservableListContentProvider; import org.eclipse.jface.databinding.wizard.WizardPageSupport; import org.eclipse.jface.dialogs.InputDialog; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ListViewer; import org.eclipse.jface.window.Window; import org.eclipse.jface.wizard.IWizard; import org.eclipse.jface.wizard.Wizard; import org.eclipse.jface.wizard.WizardDialog; import org.eclipse.jface.wizard.WizardPage; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Text; /** * @since 3.2 * */ public class Snippet021MultiFieldValidation extends WizardPage { private List list_1; private List list; private Button addAddendButton; private Button removeAddendButton; private Text sumModelValue; private Text field2ModelValue; private Text field1ModelValue; private Text sumTarget; private Text field2Target; private Text field1Target; private ListViewer addendsTarget; private ListViewer addendsModelValue; /** * Create the wizard */ public Snippet021MultiFieldValidation() { super("snippet021"); setTitle("Snippet 021 - Multi-field Validators"); setDescription("Enter values which satisfy the cross-field constraints"); } /** * Create contents of the wizard * * @param parent */ @Override public void createControl(Composite parent) { Composite container = new Composite(parent, SWT.NULL); final GridLayout gridLayout = new GridLayout(); gridLayout.numColumns = 2; container.setLayout(gridLayout); // setControl(container); final Group bothEvenOrGroup = new Group(container, SWT.NONE); bothEvenOrGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false)); bothEvenOrGroup.setText("Numbers must be both even or both odd"); final GridLayout gridLayout_1 = new GridLayout(); gridLayout_1.numColumns = 3; bothEvenOrGroup.setLayout(gridLayout_1); new Label(bothEvenOrGroup, SWT.NONE); final Label targetLabel = new Label(bothEvenOrGroup, SWT.NONE); targetLabel.setText("Target"); final Label modelLabel = new Label(bothEvenOrGroup, SWT.NONE); modelLabel.setText("Model"); final Label field1Label = new Label(bothEvenOrGroup, SWT.NONE); field1Label.setText("Field 1"); field1Target = new Text(bothEvenOrGroup, SWT.BORDER); final GridData gd_field1Target = new GridData(SWT.FILL, SWT.CENTER, true, false); field1Target.setLayoutData(gd_field1Target); field1ModelValue = new Text(bothEvenOrGroup, SWT.READ_ONLY | SWT.BORDER); final GridData gd_field1ModelValue = new GridData(SWT.FILL, SWT.CENTER, true, false); field1ModelValue.setLayoutData(gd_field1ModelValue); final Label field2Label = new Label(bothEvenOrGroup, SWT.NONE); field2Label.setText("Field 2"); field2Target = new Text(bothEvenOrGroup, SWT.BORDER); final GridData gd_field2Target = new GridData(SWT.FILL, SWT.CENTER, true, false); field2Target.setLayoutData(gd_field2Target); field2ModelValue = new Text(bothEvenOrGroup, SWT.READ_ONLY | SWT.BORDER); final GridData gd_field2ModelValue = new GridData(SWT.FILL, SWT.CENTER, true, false); field2ModelValue.setLayoutData(gd_field2ModelValue); final Group sumOfAllGroup = new Group(container, SWT.NONE); sumOfAllGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true)); sumOfAllGroup.setText("Addends must add up to sum"); final GridLayout gridLayout_2 = new GridLayout(); gridLayout_2.numColumns = 3; sumOfAllGroup.setLayout(gridLayout_2); new Label(sumOfAllGroup, SWT.NONE); final Label targetLabel_1 = new Label(sumOfAllGroup, SWT.NONE); targetLabel_1.setText("Target"); final Label modelLabel_1 = new Label(sumOfAllGroup, SWT.NONE); modelLabel_1.setText("Model"); final Label expectedSumLabel = new Label(sumOfAllGroup, SWT.NONE); expectedSumLabel.setText("Sum"); sumTarget = new Text(sumOfAllGroup, SWT.BORDER); final GridData gd_sumTarget = new GridData(SWT.FILL, SWT.CENTER, true, false); sumTarget.setLayoutData(gd_sumTarget); sumModelValue = new Text(sumOfAllGroup, SWT.READ_ONLY | SWT.BORDER); final GridData gd_sumModelValue = new GridData(SWT.FILL, SWT.CENTER, true, false); sumModelValue.setLayoutData(gd_sumModelValue); final Label addendsLabel = new Label(sumOfAllGroup, SWT.NONE); addendsLabel.setText("Addends"); addendsTarget = new ListViewer(sumOfAllGroup, SWT.V_SCROLL | SWT.BORDER); list_1 = addendsTarget.getList(); list_1.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true, 1, 2)); addendsModelValue = new ListViewer(sumOfAllGroup, SWT.V_SCROLL | SWT.BORDER); list = addendsModelValue.getList(); list.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true, 1, 2)); final Composite composite = new Composite(sumOfAllGroup, SWT.NONE); composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false)); final GridLayout gridLayout_3 = new GridLayout(); gridLayout_3.marginWidth = 0; gridLayout_3.marginHeight = 0; composite.setLayout(gridLayout_3); addAddendButton = new Button(composite, SWT.NONE); addAddendButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false)); addAddendButton.setText("Add"); removeAddendButton = new Button(composite, SWT.NONE); removeAddendButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false)); removeAddendButton.setText("Remove"); bindUI(); } private void bindUI() { DataBindingContext dbc = new DataBindingContext(); bindEvensAndOddsGroup(dbc); bindSumAndAddendsGroup(dbc); WizardPageSupport.create(this, dbc); } private void bindEvensAndOddsGroup(DataBindingContext dbc) { IObservableValue<String> targetField1 = WidgetProperties.text(SWT.Modify).observe(field1Target); final IObservableValue<Integer> middleField1 = new WritableValue<>(Integer.valueOf(0), Integer.TYPE); dbc.bindValue(targetField1, middleField1); IObservableValue<String> targetField2 = WidgetProperties.text(SWT.Modify).observe(field2Target); final IObservableValue<Integer> middleField2 = new WritableValue<>(Integer.valueOf(0), Integer.TYPE); dbc.bindValue(targetField2, middleField2); MultiValidator validator = new MultiValidator() { @Override protected IStatus validate() { Integer field1 = middleField1.getValue(); Integer field2 = middleField2.getValue(); if (Math.abs(field1.intValue()) % 2 != Math.abs(field2.intValue()) % 2) return ValidationStatus.error("Fields 1 and 2 must be both even or both odd"); return null; } }; dbc.addValidationStatusProvider(validator); IObservableValue<Integer> modelField1 = new WritableValue<>(Integer.valueOf(1), Integer.TYPE); IObservableValue<Integer> modelField2 = new WritableValue<>(Integer.valueOf(4), Integer.TYPE); dbc.bindValue(validator.observeValidatedValue(middleField1), modelField1); dbc.bindValue(validator.observeValidatedValue(middleField2), modelField2); dbc.bindValue(WidgetProperties.text(SWT.Modify).observe(field1ModelValue), modelField1); dbc.bindValue(WidgetProperties.text(SWT.Modify).observe(field2ModelValue), modelField2); } private void bindSumAndAddendsGroup(DataBindingContext dbc) { IObservableValue<String> targetSum = WidgetProperties.text(SWT.Modify).observe(sumTarget); final IObservableValue<Integer> middleSum = new WritableValue<>(0, Integer.TYPE); dbc.bindValue(targetSum, middleSum); final IObservableList<Integer> targetAddends = new WritableList<>(new ArrayList<>(), Integer.TYPE); addendsTarget.setContentProvider(new ObservableListContentProvider<>()); addendsTarget.setInput(targetAddends); addAddendButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(final SelectionEvent e) { InputDialog dialog = new InputDialog(getShell(), "Input addend", "Enter an integer addend", "0", newText -> { try { Integer.valueOf(newText); return null; } catch (NumberFormatException e1) { return "Enter a number between " + Integer.MIN_VALUE + " and " + Integer.MAX_VALUE; } }); if (dialog.open() == Window.OK) { targetAddends.add(Integer.valueOf(dialog.getValue())); } } }); removeAddendButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { IStructuredSelection selection = addendsTarget.getStructuredSelection(); if (!selection.isEmpty()) targetAddends.remove(selection.getFirstElement()); } }); IObservableValue<Integer> modelSum = new WritableValue<>(Integer.valueOf(5), Integer.TYPE); dbc.bindValue(WidgetProperties.text(SWT.Modify).observe(sumModelValue), modelSum); IObservableList<Integer> modelAddends = new WritableList<>(new ArrayList<>(), Integer.TYPE); MultiValidator validator = new MultiValidator() { @Override protected IStatus validate() { int sum = middleSum.getValue(); int actualSum = 0; for (int i : targetAddends) { actualSum += i; } if (sum != actualSum) return ValidationStatus.error("Sum of addends is " + actualSum + ", expecting " + sum); return ValidationStatus.ok(); } }; dbc.addValidationStatusProvider(validator); addendsModelValue.setContentProvider(new ObservableListContentProvider<>()); addendsModelValue.setInput(modelAddends); dbc.bindValue(validator.observeValidatedValue(middleSum), modelSum); dbc.bindList(validator.observeValidatedList(targetAddends), modelAddends); } static class MultiFieldValidationWizard extends Wizard { @Override public void addPages() { addPage(new Snippet021MultiFieldValidation()); } @Override public String getWindowTitle() { return "Snippet 021 - Multi-field Validation"; } @Override public boolean performFinish() { return true; } } public static void main(String[] args) { Display display = new Display(); Realm.runWithDefault(DisplayRealm.getRealm(display), () -> { IWizard wizard = new MultiFieldValidationWizard(); WizardDialog dialog = new WizardDialog(null, wizard); dialog.open(); // The SWT event loop Display display1 = Display.getCurrent(); while (dialog.getShell() != null && !dialog.getShell().isDisposed()) { if (!display1.readAndDispatch()) { display1.sleep(); } } }); display.dispose(); } }