Java tutorial
/******************************************************************************* * Copyright (c) 2006 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.bpel.ui.properties; import java.util.Arrays; import org.eclipse.bpel.common.ui.details.IDetailsAreaConstants; import org.eclipse.bpel.common.ui.flatui.FlatFormAttachment; import org.eclipse.bpel.common.ui.flatui.FlatFormData; import org.eclipse.bpel.model.BPELPackage; import org.eclipse.bpel.model.Validate; import org.eclipse.bpel.model.Variable; import org.eclipse.bpel.ui.IHelpContextIds; import org.eclipse.bpel.ui.Messages; import org.eclipse.bpel.ui.commands.AddVariableToValidateCommand; import org.eclipse.bpel.ui.commands.CompoundCommand; import org.eclipse.bpel.ui.commands.RemoveValidateVariableCommand; import org.eclipse.bpel.ui.details.providers.AbstractContentProvider; import org.eclipse.bpel.ui.details.providers.ModelLabelProvider; import org.eclipse.bpel.ui.dialogs.VariableSelectorDialog; import org.eclipse.bpel.ui.util.BPELUtil; import org.eclipse.bpel.ui.util.ModelHelper; import org.eclipse.bpel.ui.util.MultiObjectAdapter; import org.eclipse.emf.common.notify.Notification; import org.eclipse.emf.common.util.EList; import org.eclipse.emf.ecore.EObject; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ListViewer; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.ui.PlatformUI; /** * Details section for the variables of a Validate. */ public class ValidateVariablesSection extends BPELPropertySection { protected Button fAddButton; protected Button fRemoveButton; List fVariableList; ListViewer fVariablesViewer; /** * @see org.eclipse.ui.views.properties.tabbed.AbstractPropertySection#shouldUseExtraSpace() */ @Override public boolean shouldUseExtraSpace() { return true; } @Override protected MultiObjectAdapter[] createAdapters() { return new MultiObjectAdapter[] { /* model object and Correlations object */ new MultiObjectAdapter() { @Override public void notify(Notification n) { if (n.getFeature() == BPELPackage.eINSTANCE.getValidate_Variables()) { updateVariableWidgets(null); refreshAdapters(); } } }, /* correlation(s) and correlation set(s) */ new MultiObjectAdapter() { @Override public void notify(Notification n) { if (n.getNotifier() instanceof Variable) { updateVariableWidgets((Variable) n.getNotifier()); refreshAdapters(); } } } }; } @Override protected void addAllAdapters() { super.addAllAdapters(); Validate validate = getModel(); EList<Variable> variables = validate.getVariables(); if (variables != null) { for (Variable var : variables) { fAdapters[1].addToObject(var); } } } protected void createVariablesWidgets(final Composite composite) { FlatFormData data; fAddButton = fWidgetFactory.createButton(composite, Messages.ValidateDetails_1, SWT.PUSH); fRemoveButton = fWidgetFactory.createButton(composite, Messages.ValidateDetails_2, SWT.PUSH); Label validateVariablesLabel = fWidgetFactory.createLabel(composite, Messages.ValidateDetails_3); fVariableList = fWidgetFactory.createList(composite, SWT.FULL_SELECTION | SWT.V_SCROLL | SWT.MULTI | SWT.BORDER); data = new FlatFormData(); data.left = new FlatFormAttachment(0, IDetailsAreaConstants.HSPACE); data.top = new FlatFormAttachment(0, IDetailsAreaConstants.VSPACE); validateVariablesLabel.setLayoutData(data); data = new FlatFormData(); data.width = BPELUtil.calculateButtonWidth(fAddButton, STANDARD_BUTTON_WIDTH); data.right = new FlatFormAttachment(fRemoveButton, -IDetailsAreaConstants.HSPACE); data.top = new FlatFormAttachment(0, IDetailsAreaConstants.VSPACE); fAddButton.setLayoutData(data); data = new FlatFormData(); data.width = BPELUtil.calculateButtonWidth(fRemoveButton, STANDARD_BUTTON_WIDTH); data.right = new FlatFormAttachment(100, (-2) * IDetailsAreaConstants.HSPACE); data.top = new FlatFormAttachment(0, IDetailsAreaConstants.VSPACE); fRemoveButton.setLayoutData(data); fRemoveButton.setEnabled(false); fAddButton.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { Shell shell = composite.getShell(); EObject model = getInput(); VariableSelectorDialog dialog = new VariableSelectorDialog(shell, model, ModelHelper.getVariableType(model, ModelHelper.OUTGOING)) { @Override protected void computeResult() { Object[] results = getSelectedElements(); setResult(Arrays.asList(results)); } }; dialog.setMultipleSelection(true); dialog.setTitle(Messages.ValidateDetails_4); if (dialog.open() == Window.OK) { CompoundCommand ccmd = new CompoundCommand(); Variable variable = null; for (Object next : dialog.getResult()) { variable = (Variable) next; ccmd.add(new AddVariableToValidateCommand(getInput(), variable)); } runCommand(ccmd); fVariablesViewer.setSelection(new StructuredSelection(variable), true); } } public void widgetDefaultSelected(SelectionEvent e) { widgetSelected(e); } }); Listener removeListener = new Listener() { public void handleEvent(Event e) { if (e.type == SWT.KeyUp && e.character != SWT.DEL) { return; } IStructuredSelection sel = (IStructuredSelection) fVariablesViewer.getSelection(); int selectionIndex = fVariableList.getSelectionIndex(); CompoundCommand ccmd = new CompoundCommand(); for (Object next : sel.toArray()) { Variable var = (Variable) next; ccmd.add(new RemoveValidateVariableCommand(getInput(), var)); } runCommand(ccmd); // selects the element at the deleted element position int items = fVariableList.getItemCount(); if (items > 0) { selectionIndex = (selectionIndex < items) ? selectionIndex : 0; fVariableList.setSelection(selectionIndex); } else { fVariablesViewer.setSelection(StructuredSelection.EMPTY); } } }; fVariableList.addListener(SWT.KeyUp, removeListener); fRemoveButton.addListener(SWT.Selection, removeListener); fRemoveButton.addListener(SWT.DefaultSelection, removeListener); data = new FlatFormData(); data.left = new FlatFormAttachment(0, IDetailsAreaConstants.HSPACE); data.right = new FlatFormAttachment(100, (-2) * IDetailsAreaConstants.HSPACE); data.top = new FlatFormAttachment(fAddButton, IDetailsAreaConstants.VSPACE); data.bottom = new FlatFormAttachment(100, (-1) * IDetailsAreaConstants.VSPACE); fVariableList.setLayoutData(data); fVariablesViewer = new ListViewer(fVariableList); fVariablesViewer.setLabelProvider(new ModelLabelProvider()); fVariablesViewer.setContentProvider(new AbstractContentProvider() { @Override public Object[] getElements(Object inputElement) { try { Validate input = (Validate) inputElement; EList<?> l = input.getVariables(); return (l == null) ? EMPTY_ARRAY : l.toArray(); } catch (Throwable t) { return EMPTY_ARRAY; } } }); fVariablesViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { fRemoveButton.setEnabled(fVariablesViewer.getSelection().isEmpty() == false); } }); PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, IHelpContextIds.PROPERTY_PAGE_VALIDATE_DETAILS); } @Override protected void createClient(Composite parent) { Composite composite = createFlatFormComposite(parent); createVariablesWidgets(composite); } protected void updateVariableWidgets(Variable var) { Object input = getInput(); if (input == null) { throw new IllegalStateException(); } fVariablesViewer.setInput(input); if (var != null) { fVariablesViewer.refresh(var, true); } else { fVariablesViewer.refresh(); } } /** * @see org.eclipse.bpel.ui.properties.BPELPropertySection#refresh() */ @Override public void refresh() { super.refresh(); updateVariableWidgets(null); } /** * @see org.eclipse.bpel.ui.properties.BPELPropertySection#getUserContext() */ @Override public Object getUserContext() { return ((StructuredSelection) fVariablesViewer.getSelection()).getFirstElement(); } /** * @see org.eclipse.bpel.ui.properties.BPELPropertySection#restoreUserContext(java.lang.Object) */ @Override public void restoreUserContext(Object userContext) { fVariableList.setFocus(); if (userContext != null) { fVariablesViewer.setSelection(new StructuredSelection(userContext), true); } else { fVariablesViewer.setSelection(StructuredSelection.EMPTY); } } @Override protected void basicSetInput(EObject newInput) { saveUserContextToInput(); super.basicSetInput(newInput); restoreUserContextFromInput(); } }