| /******************************************************************************* |
| * Copyright (c) 2007 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.databinding.wizard; |
| |
| import java.util.Iterator; |
| |
| import org.eclipse.core.databinding.AggregateValidationStatus; |
| import org.eclipse.core.databinding.Binding; |
| import org.eclipse.core.databinding.DataBindingContext; |
| import org.eclipse.core.databinding.observable.ChangeEvent; |
| import org.eclipse.core.databinding.observable.IChangeListener; |
| import org.eclipse.core.databinding.observable.list.IListChangeListener; |
| import org.eclipse.core.databinding.observable.list.ListChangeEvent; |
| import org.eclipse.core.databinding.observable.list.ListDiff; |
| import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
| import org.eclipse.core.databinding.observable.value.IValueChangeListener; |
| import org.eclipse.core.databinding.observable.value.ValueChangeEvent; |
| import org.eclipse.core.runtime.AssertionFailedException; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.jface.dialogs.IMessageProvider; |
| import org.eclipse.jface.wizard.WizardPage; |
| |
| /** |
| * Connects the validation result from the given data binding context to the |
| * given wizard page, updating the wizard page's completion state and its error |
| * message accordingly. |
| * |
| * This class is not intended to be extended by clients. |
| * |
| * @since 1.1 |
| */ |
| public class WizardPageSupport { |
| |
| private WizardPage wizardPage; |
| private DataBindingContext dbc; |
| private AggregateValidationStatus aggregateStatus; |
| private boolean uiChanged = false; |
| |
| /** |
| * Connect the validation result from the given data binding context to the |
| * given wizard page. Upon creation, the wizard page support will use the |
| * context's validation result to determine whether the page is complete. |
| * The page's error message will not be set at this time ensuring that the |
| * wizard page does not show an error right away. Upon any validation result |
| * change, {@link WizardPage#setPageComplete(boolean)} will be called |
| * reflecting the new validation result, and the wizard page's error message |
| * will be updated according to the current validation result. |
| * |
| * @param wizardPage |
| * @param dbc |
| * @return an instance of WizardPageSupport |
| */ |
| public static WizardPageSupport create(WizardPage wizardPage, |
| DataBindingContext dbc) { |
| return new WizardPageSupport(wizardPage, dbc); |
| } |
| |
| private WizardPageSupport(WizardPage wizardPage, DataBindingContext dbc) { |
| this.wizardPage = wizardPage; |
| this.dbc = dbc; |
| init(); |
| } |
| |
| private IChangeListener uiChangeListener = new IChangeListener() { |
| public void handleChange(ChangeEvent event) { |
| handleUIChanged(); |
| } |
| }; |
| private IListChangeListener bindingsListener = new IListChangeListener() { |
| public void handleListChange(ListChangeEvent event) { |
| ListDiff diff = event.diff; |
| ListDiffEntry[] differences = diff.getDifferences(); |
| for (int i = 0; i < differences.length; i++) { |
| ListDiffEntry listDiffEntry = differences[i]; |
| Binding binding = (Binding) listDiffEntry.getElement(); |
| if (listDiffEntry.isAddition()) { |
| binding.getTarget().addChangeListener(uiChangeListener); |
| } else { |
| binding.getTarget().removeChangeListener(uiChangeListener); |
| } |
| } |
| } |
| }; |
| private IStatus currentStatus; |
| |
| protected void init() { |
| aggregateStatus = new AggregateValidationStatus(dbc.getBindings(), |
| AggregateValidationStatus.MAX_SEVERITY); |
| aggregateStatus.addValueChangeListener(new IValueChangeListener() { |
| public void handleValueChange(ValueChangeEvent event) { |
| |
| currentStatus = (IStatus) event.diff.getNewValue(); |
| handleStatusChanged(); |
| } |
| }); |
| currentStatus = (IStatus) aggregateStatus.getValue(); |
| handleStatusChanged(); |
| dbc.getBindings().addListChangeListener(bindingsListener); |
| for (Iterator it = dbc.getBindings().iterator(); it.hasNext();) { |
| Binding binding = (Binding) it.next(); |
| binding.getTarget().addChangeListener(uiChangeListener); |
| } |
| } |
| |
| protected void handleUIChanged() { |
| uiChanged = true; |
| if (currentStatus != null) { |
| handleStatusChanged(); |
| } |
| dbc.getBindings().removeListChangeListener(bindingsListener); |
| for (Iterator it = dbc.getBindings().iterator(); it.hasNext();) { |
| Binding binding = (Binding) it.next(); |
| binding.getTarget().removeChangeListener(uiChangeListener); |
| } |
| } |
| |
| protected void handleStatusChanged() { |
| if (currentStatus != null |
| && currentStatus.getSeverity() == IStatus.ERROR) { |
| wizardPage.setPageComplete(false); |
| wizardPage.setMessage(null); |
| wizardPage.setErrorMessage(uiChanged ? currentStatus.getMessage() |
| : null); |
| } else if (currentStatus != null |
| && currentStatus.getSeverity() != IStatus.OK) { |
| int severity = currentStatus.getSeverity(); |
| wizardPage.setPageComplete((severity & IStatus.CANCEL) != 0); |
| int type; |
| switch (severity) { |
| case IStatus.OK: |
| type = IMessageProvider.NONE; |
| break; |
| case IStatus.CANCEL: |
| type = IMessageProvider.NONE; |
| break; |
| case IStatus.INFO: |
| type = IMessageProvider.INFORMATION; |
| break; |
| case IStatus.WARNING: |
| type = IMessageProvider.WARNING; |
| break; |
| case IStatus.ERROR: |
| type = IMessageProvider.ERROR; |
| break; |
| default: |
| throw new AssertionFailedException( |
| "incomplete switch statement"); //$NON-NLS-1$ |
| } |
| wizardPage.setErrorMessage(null); |
| wizardPage.setMessage(currentStatus.getMessage(), type); |
| } else { |
| wizardPage.setPageComplete(true); |
| wizardPage.setMessage(null); |
| wizardPage.setErrorMessage(null); |
| } |
| } |
| |
| /** |
| * Disposes of this wizard page support object, removing any listeners it |
| * may have attached. |
| */ |
| public void dispose() { |
| aggregateStatus.dispose(); |
| if (!uiChanged) { |
| for (Iterator it = dbc.getBindings().iterator(); it.hasNext();) { |
| Binding binding = (Binding) it.next(); |
| binding.getTarget().removeChangeListener(uiChangeListener); |
| } |
| dbc.getBindings().removeListChangeListener(bindingsListener); |
| } |
| aggregateStatus = null; |
| dbc = null; |
| uiChangeListener = null; |
| bindingsListener = null; |
| wizardPage = null; |
| } |
| } |