Java tutorial
/* * Copyright (c) 2011, 2012, 2015, 2016 Eike Stepper (Berlin, Germany) 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: * Eike Stepper - initial API and implementation */ package org.eclipse.emf.cdo.ui.widgets; import org.eclipse.emf.cdo.common.branch.CDOBranch; import org.eclipse.emf.cdo.common.branch.CDOBranchManager; import org.eclipse.emf.cdo.common.branch.CDOBranchPoint; import org.eclipse.emf.cdo.session.CDOSession; import org.eclipse.emf.cdo.ui.CDOItemProvider; import org.eclipse.net4j.util.ObjectUtil; import org.eclipse.net4j.util.ui.ValidationContext; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Group; /** * Composed UI widget offering functionality for users to select {@link org.eclipse.emf.cdo.common.branch.CDOBranch * branches} and a {@link org.eclipse.emf.cdo.common.branch.CDOBranchPoint timestamp} within a branch for a particular * {@link org.eclipse.emf.cdo.session.CDOSession CDOSession} * * @author Eike Stepper * @since 4.0 */ public class ComposeBranchPointComposite extends Composite { private boolean allowTimeStamp; private CDOBranchPoint branchPoint; private TreeViewer branchViewer; private Group timeStampGroup; private SelectTimeStampComposite timeStampComposite; /** * @since 4.4 */ public ComposeBranchPointComposite(Composite parent, boolean allowTimeStamp, CDOBranchPoint branchPoint) { this(parent, SWT.NONE, null, branchPoint, allowTimeStamp); } /** * @deprecated as of 4.4 use {@link #ComposeBranchPointComposite(Composite, boolean, CDOBranchPoint)}. */ @Deprecated public ComposeBranchPointComposite(Composite parent, int style, CDOSession session, CDOBranchPoint branchPoint, boolean allowTimeStamp) { super(parent, style); this.allowTimeStamp = allowTimeStamp; this.branchPoint = branchPoint; GridLayout containerGridLayout = new GridLayout(1, false); containerGridLayout.marginWidth = 0; containerGridLayout.marginHeight = 0; containerGridLayout.verticalSpacing = 10; setLayout(containerGridLayout); createUI(); } /** * @since 4.4 */ public boolean isAllowTimeStamp() { return allowTimeStamp; } /** * @since 4.4 */ public final void setAllowTimeStamp(boolean allowTimeStamp) { if (this.allowTimeStamp != allowTimeStamp) { this.allowTimeStamp = allowTimeStamp; if (timeStampGroup != null && !allowTimeStamp) { timeStampGroup.dispose(); timeStampGroup = null; timeStampComposite = null; } else if (timeStampGroup == null && allowTimeStamp) { timeStampComposite = createSelectTimeStampComposite(); } layout(); } } public CDOBranchPoint getBranchPoint() { return branchPoint; } /** * @since 4.4 */ public void setBranchPoint(CDOBranchPoint branchPoint) { this.branchPoint = branchPoint; if (branchPoint != null) { final CDOBranch branch = branchPoint.getBranch(); final long timeStamp = branchPoint.getTimeStamp(); if (branchViewer != null) { setBranchViewerInput(); getDisplay().asyncExec(new Runnable() { public void run() { branchViewer.setSelection(new StructuredSelection(branch)); } }); } if (timeStampComposite != null) { timeStampComposite.setBranch(branch); timeStampComposite.setTimeStamp(timeStamp); } } } /** * @since 4.4 */ public TreeViewer getBranchViewer() { return branchViewer; } public SelectTimeStampComposite getSelectTimeComposite() { return timeStampComposite; } /** * @deprecated as of 4.4 use {@link #getBranchViewer()}. */ @Deprecated public SelectBranchComposite getSelectBranchComposite() { throw new UnsupportedOperationException(); } /** * @deprecated as of 4.4 no longer supported. */ @Deprecated public CDOSession getSession() { return null; } /** * @since 4.4 */ protected void createUI() { branchViewer = createBranchViewer(); branchViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); Object element = selection.getFirstElement(); if (element == null) { return; } if (element instanceof CDOBranch) { CDOBranch branch = (CDOBranch) element; if (timeStampComposite != null) { timeStampComposite.setBranch(branch); } composeBranchPoint(); } } }); if (allowTimeStamp) { timeStampComposite = createSelectTimeStampComposite(); } if (branchPoint != null) { setBranchViewerInput(); } } /** * @since 4.4 */ protected TreeViewer createBranchViewer() { CDOItemProvider itemProvider = createBranchItemProvider(); TreeViewer branchViewer = new TreeViewer(this, SWT.BORDER | SWT.SINGLE); branchViewer.getTree().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); branchViewer.setLabelProvider(itemProvider); branchViewer.setContentProvider(itemProvider); branchViewer.addDoubleClickListener(new IDoubleClickListener() { public void doubleClick(DoubleClickEvent event) { doubleClicked(); } }); return branchViewer; } /** * @since 4.4 */ protected CDOItemProvider createBranchItemProvider() { return new CDOItemProvider(null); } /** * @since 4.4 */ protected SelectTimeStampComposite createSelectTimeStampComposite() { timeStampGroup = new Group(this, SWT.NONE); timeStampGroup.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); timeStampGroup.setLayout(new GridLayout(1, false)); timeStampGroup.setText("Time Stamp:"); SelectTimeStampComposite timeStampComposite = new SelectTimeStampComposite(timeStampGroup, SWT.NONE, branchPoint.getBranch(), branchPoint.getTimeStamp()) { @Override protected void timeStampChanged(long timeStamp) { composeBranchPoint(); } }; timeStampComposite.getTimeBrowseButton().setVisible(false); timeStampComposite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); timeStampComposite.setValidationContext(new ValidationContext() { public void setValidationError(Object source, String message) { timeStampError(message); } }); return timeStampComposite; } /** * @deprecated as of 4.4 use {@link #createSelectTimeStampComposite()}. */ @Deprecated protected SelectTimeStampComposite createSelectTimeStampComposite(CDOBranch branch, long timeStamp) { return createSelectTimeStampComposite(); } /** * @deprecated as of 4.4 use {@link #createBranchViewer()}. */ @Deprecated protected SelectBranchComposite createSelectBranchComposite(CDOSession session, CDOBranch branch) { return new SelectBranchComposite(this, SWT.NONE, session, branch) { @Override protected void branchChanged(CDOBranch newBranch) { if (timeStampComposite != null) { timeStampComposite.setBranch(newBranch); } composeBranchPoint(); } }; } /** * @since 4.4 */ protected void timeStampError(String message) { } protected void branchPointChanged(CDOBranchPoint branchPoint) { } /** * @since 4.4 */ protected void doubleClicked() { } private void setBranchViewerInput() { CDOBranchManager input = branchPoint.getBranch().getBranchManager(); if (input != branchViewer.getInput()) { branchViewer.setInput(input); } } private void composeBranchPoint() { if (branchViewer == null) { return; } CDOBranchPoint oldBranchPoint = branchPoint; IStructuredSelection selection = (IStructuredSelection) branchViewer.getSelection(); CDOBranch branch = (CDOBranch) selection.getFirstElement(); if (branch != null) { long timeStamp = CDOBranchPoint.UNSPECIFIED_DATE; if (allowTimeStamp && timeStampComposite != null) { timeStamp = timeStampComposite.getTimeStamp(); } branchPoint = branch.getPoint(timeStamp); if (!ObjectUtil.equals(branchPoint, oldBranchPoint)) { branchPointChanged(branchPoint); } } } }