Show number of differences in the Compare editor eclipse-platform#504

Show number of differences (Ex: 6 Differences) in the toolbar of compare
editor
which matches "Change markers" next to the scroll bar in compare editor

Fixes eclipse-platform#504

team/bundles/org.eclipse.compare/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.compare; singleton:=true
-Bundle-Version: 3.9.300.qualifier
+Bundle-Version: 3.10.0.qualifier
 Bundle-Activator: org.eclipse.compare.internal.CompareUIPlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin

team/bundles/org.eclipse.compare/compare/org/eclipse/compare/LabelContributionItem.java

@@ -0,0 +1,66 @@
+/*******************************************************************************
+ * Copyright (c) ETAS GmbH 2023, all rights reserved.
+ *
+ * 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:
+ *     ETAS GmbH - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.compare;
+
+import org.eclipse.jface.action.ControlContribution;
+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.Control;
+import org.eclipse.swt.widgets.Label;
+
+
+/**
+ * @since 3.10
+ *
+ *        A contribution item which delegates to a label on the tool bar.
+ *
+ */
+public class LabelContributionItem extends ControlContribution {
+
+	private Label toolbarLabel;
+	private String labelName;
+
+	/**
+	 * @param id
+	 * @param name
+	 */
+	public LabelContributionItem(String id, String name) {
+		super(id);
+		this.labelName = name;
+	}
+
+	@Override
+	protected Control createControl(Composite parent) {
+		Composite composite = new Composite(parent, SWT.LEFT);
+		this.toolbarLabel = new Label(composite, SWT.LEFT);
+
+		GridLayout compositeLayout = new GridLayout(1, false);
+		compositeLayout.marginTop = -3;
+		compositeLayout.marginBottom = -3;
+		composite.setLayout(compositeLayout);
+		GridData labelLayout = new GridData(SWT.LEFT, SWT.BOTTOM, true, true);
+
+		this.toolbarLabel.setLayoutData(labelLayout);
+		this.toolbarLabel.setText(this.labelName);
+
+		return composite;
+	}
+
+	public Label getToolbarLabel() {
+		return toolbarLabel;
+	}
+}

team/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/ContentMergeViewer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2020 IBM Corporation and others.
+ * Copyright (c) 2000, 2023 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -13,6 +13,7 @@
  *     Alex Blewitt <[email protected]> - replace new Boolean with Boolean.valueOf - https://bugs.eclipse.org/470344
  *     Stefan Xenos <[email protected]> (Google) - bug 448968 - Add diagnostic logging
  *     Conrad Groth - Bug 213780 - Compare With direction should be configurable
+ *     Latha Patil (ETAS GmbH) - Issue #504 Show number of differences in the Compare editor
  *******************************************************************************/
 
 package org.eclipse.compare.contentmergeviewer;
@@ -27,6 +28,7 @@
 import org.eclipse.compare.ICompareContainer;
 import org.eclipse.compare.ICompareInputLabelProvider;
 import org.eclipse.compare.IPropertyChangeNotifier;
+import org.eclipse.compare.LabelContributionItem;
 import org.eclipse.compare.internal.ChangePropertyAction;
 import org.eclipse.compare.internal.CompareEditor;
 import org.eclipse.compare.internal.CompareHandlerService;
@@ -364,6 +366,7 @@ private void resize(MouseEvent e) {
 	private Cursor fHSashCursor;
 	private Cursor fVSashCursor;
 	private Cursor fHVSashCursor;
+	private int documentDiffCount;
 
 	private final ILabelProviderListener labelChangeListener = event -> {
 		Object[] elements = event.getElements();
@@ -778,6 +781,7 @@ public void refresh() {
 	}
 
 	private void internalRefresh(Object input) {
+		final String DIFF_COUNT_ID = "DiffCount"; //$NON-NLS-1$
 		IMergeViewerContentProvider content= getMergeContentProvider();
 		if (content != null) {
 			Object ancestor= content.getAncestorContent(input);
@@ -803,7 +807,16 @@ private void internalRefresh(Object input) {
 			updateHeader();
 			if (Utilities.okToUse(fComposite) && Utilities.okToUse(fComposite.getParent())) {
 				ToolBarManager tbm = (ToolBarManager) getToolBarManager(fComposite.getParent());
-				if (tbm != null ) {
+				if (tbm != null) {
+					String label = documentDiffCount > 1 ? " Differences" : " Difference"; //$NON-NLS-1$ //$NON-NLS-2$
+					LabelContributionItem labelContributionItem = new LabelContributionItem(DIFF_COUNT_ID,
+							documentDiffCount + label);
+
+					if (tbm.find(DIFF_COUNT_ID) != null) {
+						tbm.replaceItem(DIFF_COUNT_ID, labelContributionItem);
+					} else {
+						tbm.appendToGroup("diffLabel", labelContributionItem); //$NON-NLS-1$
+					}
 					updateToolItems();
 					Display.getDefault().asyncExec(() -> {
 						// relayout in next tick
@@ -909,6 +922,7 @@ private void initializeToolbars(Composite parent) {
 			tbm.removeAll();
 
 			// Define groups.
+			tbm.add(new Separator("diffLabel")); //$NON-NLS-1$
 			tbm.add(new Separator("modes"));	//$NON-NLS-1$
 			tbm.add(new Separator("merge"));	//$NON-NLS-1$
 			tbm.add(new Separator("navigation"));	//$NON-NLS-1$
@@ -1451,4 +1465,12 @@ protected boolean isLeftEditable() {
 	protected boolean isRightEditable() {
 		return fCompareConfiguration.isMirrored() ? fCompareConfiguration.isLeftEditable() : fCompareConfiguration.isRightEditable();
 	}
+
+	/**
+	 * @param docDiffCount - current number of differences in the compare editor
+	 * @since 3.10
+	 */
+	protected void setDocumentDiffCount(int docDiffCount) {
+		documentDiffCount = docDiffCount;
+	}
 }

team/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/TextMergeViewer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2019 IBM Corporation and others.
+ * Copyright (c) 2000, 2023 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -21,6 +21,7 @@
  *     Robin Stocker ([email protected]) - Bug 399960: [Edit] Make merge arrow buttons easier to hit
  *     John Hendrikx ([email protected]) - Bug 541401 - [regression] Vertical scrollbar thumb size is wrong in compare view
  *     Stefan Dirix ([email protected]) - Bug 473847: Minimum E4 Compatibility of Compare
+ *     Latha Patil (ETAS GmbH) - Issue #504 Show number of differences in the Compare editor
  *******************************************************************************/
 package org.eclipse.compare.contentmergeviewer;
 
@@ -3059,7 +3060,9 @@ protected void updateContent(Object ancestor, Object left, Object right) {
 		setSyncScrolling(fPreferenceStore.getBoolean(ComparePreferencePage.SYNCHRONIZE_SCROLLING));
 
 		update(false);
-
+		if (fMerger!=null) {
+			setDocumentDiffCount(fMerger.changesCount());
+		}
 		if (!fHasErrors && !emptyInput && !fComposite.isDisposed()) {
 			if (isRefreshing()) {
 				fLeftContributor.updateSelection(fLeft, !fSynchronizedScrolling);

team/tests/org.eclipse.compare.tests/labelContributionData/file1.java

@@ -0,0 +1,23 @@
+package testPackage;
+import java.math.*;
+public class Javaclass1 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		int a=0;
+
+		System.out.println("");
+
+		call_me();
+
+
+	}
+
+	private static void call_me() {
+		// TODO Auto-generated method stub
+		System.out.println();
+
+	}
+
+}

team/tests/org.eclipse.compare.tests/labelContributionData/file2.java

@@ -0,0 +1,31 @@
+package testPackage;
+
+import java.io.File;
+
+public class Javaclass1 {
+
+	public static void main(String[] args) {
+
+
+		int a=0;
+
+		System.out.println("");
+
+		call_me();
+
+		callMe(a);
+
+	}
+
+	private static void callMe(int a) {
+		// TODO Auto-generated method stub
+		System.out.println();
+
+	}
+
+	private static void call_me() {
+		File f= new File("");
+		System.out.println("I am calledJavaclass1.java");
+	}
+
+}

team/tests/org.eclipse.compare.tests/src/org/eclipse/compare/tests/TextMergeViewerTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2006, 2018 IBM Corporation and others.
+ * Copyright (c) 2006, 2023 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -10,6 +10,7 @@
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
+ *     Latha Patil (ETAS GmbH) - Issue #504 Show number of differences in the Compare editor
  *******************************************************************************/
 package org.eclipse.compare.tests;
 
@@ -28,13 +29,18 @@
 import org.eclipse.compare.structuremergeviewer.DiffNode;
 import org.eclipse.compare.structuremergeviewer.Differencer;
 import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IPath;
+import java.net.URL;
 import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.jface.action.IContributionItem;
+import org.eclipse.jface.action.ToolBarManager;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.text.*;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.PlatformUI;
 import org.junit.Test;
+import org.eclipse.swt.SWT;
 
 public class TextMergeViewerTest  {
 
@@ -480,6 +486,56 @@ public String getType() {
 		assertNotNull(rightDoc.getDocumentPartitioner());
 	}
 
+	@Test
+	public void testToolbarLabelContribution() throws Exception {
+
+		IPath path = IPath.fromOSString("labelContributionData/" + "file1.java");
+		URL url = new URL(CompareTestPlugin.getDefault().getBundle().getEntry("/"), path.toString());
+
+		IPath path1= IPath.fromOSString("labelContributionData/" + "file2.java");
+		 URL url1 = new URL(CompareTestPlugin.getDefault().getBundle().getEntry("/"), path1.toString());
+
+		DiffNode parentNode = new DiffNode(new ParentTestElement(), new ParentTestElement());
+		DiffNode testNode = new DiffNode(parentNode, Differencer.CHANGE, null, new EditableTestElement(url.openStream().readAllBytes()), new EditableTestElement(url1.openStream().readAllBytes()));
+
+		runInDialogWithToolbarDiffLabel(testNode, () -> {
+			//Not required
+		});
+	}
+
+	CompareViewerPane fCompareViewerPane;
+	private void runInDialogWithToolbarDiffLabel(DiffNode testNode, Runnable runnable) throws Exception {
+
+		CompareConfiguration compareConfig = new CompareConfiguration();
+		Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
+		Dialog dialog = new Dialog(shell) {
+			@Override
+			protected Control createDialogArea(Composite parent) {
+				Composite composite = (Composite) super.createDialogArea(parent);
+				 fCompareViewerPane = new CompareViewerPane(composite, SWT.BORDER | SWT.FLAT);
+				 composite.getChildren();
+				viewer = new TestMergeViewer(fCompareViewerPane,  compareConfig);
+				return composite;
+			}
+		};
+		dialog.setBlockOnOpen(false);
+		dialog.open();
+		viewer.setInput(testNode);
+		fCompareViewerPane.setContent(viewer.getControl());
+		ToolBarManager toolbarManager = CompareViewerPane.getToolBarManager(fCompareViewerPane);
+
+			IContributionItem contributionItem = toolbarManager.find("DiffCount");
+				assertNotNull(contributionItem);
+				LabelContributionItem labelContributionItem=(LabelContributionItem) contributionItem;
+				assertTrue(labelContributionItem.getToolbarLabel().getText().equals("7 Differences"));
+		try {
+			runnable.run();
+		} catch (WrappedException e) {
+			e.throwException();
+		}
+		dialog.close();
+		viewer = null;
+	}
 
 	private void runInDialogWithPartioner(Object input, Runnable runnable, final CompareConfiguration cc) throws Exception {
 		Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();