Enable searchable tree for the e4 model editor

Setting is relatively hidden for new users (or existing ones) and it is
really useful. The readonly tab is not a big functionality loss as this
text is rarely modified directly.

tools/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/tabs/XmiTab.java

@@ -0,0 +1,211 @@
+/*******************************************************************************
+ * Copyright (c) 2014, 2017 TwelveTone LLC and others.
+ * Copyright (c) 2010-2014 BestSolution.at 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:
+ * Steven Spungin <[email protected]> - initial API and implementation, Bug 391089, Bug 437543, Ongoing Maintenance
+ *******************************************************************************/
+
+package org.eclipse.e4.tools.emf.ui.internal.common.component.tabs;
+
+import javax.annotation.PostConstruct;
+import javax.inject.Inject;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences;
+import org.eclipse.e4.core.contexts.IEclipseContext;
+import org.eclipse.e4.core.di.annotations.Optional;
+import org.eclipse.e4.core.services.nls.Translation;
+import org.eclipse.e4.tools.emf.ui.internal.Messages;
+import org.eclipse.e4.tools.emf.ui.internal.common.xml.AnnotationAccess;
+import org.eclipse.e4.tools.emf.ui.internal.common.xml.EMFDocumentResourceMediator;
+import org.eclipse.e4.tools.emf.ui.internal.common.xml.XMLConfiguration;
+import org.eclipse.e4.tools.emf.ui.internal.common.xml.XMLPartitionScanner;
+import org.eclipse.e4.tools.services.IResourcePool;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.resource.Resource.Diagnostic;
+import org.eclipse.jface.resource.JFaceResources;
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IDocumentPartitioner;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.Position;
+import org.eclipse.jface.text.TextSelection;
+import org.eclipse.jface.text.rules.FastPartitioner;
+import org.eclipse.jface.text.source.Annotation;
+import org.eclipse.jface.text.source.AnnotationModel;
+import org.eclipse.jface.text.source.SourceViewer;
+import org.eclipse.jface.text.source.VerticalRuler;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.KeyAdapter;
+import org.eclipse.swt.events.KeyEvent;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Text;
+
+public class XmiTab extends Composite {
+
+	private static final String ORG_ECLIPSE_E4_TOOLS_MODELEDITOR_FILTEREDTREE_ENABLED_XMITAB_DISABLED = "org.eclipse.e4.tools.modeleditor.filteredtree.enabled.xmitab.disabled";//$NON-NLS-1$
+	private static final int VERTICAL_RULER_WIDTH = 20;
+
+	@Inject
+	private IEclipseContext context;
+
+	@Optional
+	@Inject
+	private IProject project;
+	@Inject
+	private EMFDocumentResourceMediator emfDocumentProvider;
+	@Inject
+	private IResourcePool resourcePool;
+	@Inject
+	private IEclipsePreferences preferences;
+
+	@Inject
+	@Translation
+	protected Messages Messages;
+
+	private Text text;
+	protected int offsetStart;
+	private SourceViewer sourceViewer;
+
+	@Inject
+	public XmiTab(Composite parent) {
+		super(parent, SWT.NONE);
+		setLayout(new GridLayout(1, false));
+	}
+
+	@PostConstruct
+	protected void postConstruct() {
+		text = new Text(this, SWT.SINGLE | SWT.LEAD | SWT.BORDER);
+		text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
+		text.setMessage(Messages.XmiTab_TypeTextToSearch);
+		text.addKeyListener(new KeyAdapter() {
+			@Override
+			public void keyPressed(KeyEvent e) {
+				if (e.keyCode != SWT.CR) {
+					offsetStart = 0;
+				}
+				offsetStart = searchAndHighlight(text.getText(), offsetStart);
+			}
+		});
+
+		final AnnotationModel model = new AnnotationModel();
+		final VerticalRuler verticalRuler = new VerticalRuler(VERTICAL_RULER_WIDTH, new AnnotationAccess(resourcePool));
+		final int styles = SWT.V_SCROLL | SWT.H_SCROLL | SWT.MULTI | SWT.BORDER | SWT.FULL_SELECTION;
+		sourceViewer = new SourceViewer(this, verticalRuler, styles);
+		sourceViewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
+
+		sourceViewer.configure(new XMLConfiguration(resourcePool));
+		sourceViewer.setEditable(project != null);
+		sourceViewer.getTextWidget().setFont(JFaceResources.getTextFont());
+
+		final IDocument document = emfDocumentProvider.getDocument();
+		final IDocumentPartitioner partitioner = new FastPartitioner(new XMLPartitionScanner(), new String[] {
+				XMLPartitionScanner.XML_TAG, XMLPartitionScanner.XML_COMMENT });
+		partitioner.connect(document);
+		document.setDocumentPartitioner(partitioner);
+		sourceViewer.setDocument(document);
+		verticalRuler.setModel(model);
+
+		emfDocumentProvider.setValidationChangedCallback(() -> {
+			model.removeAllAnnotations();
+
+			for (final Diagnostic d : emfDocumentProvider.getErrorList()) {
+				final Annotation a = new Annotation("e4xmi.error", false, d.getMessage()); //$NON-NLS-1$
+				int l;
+				try {
+					l = document.getLineOffset(d.getLine() - 1);
+					model.addAnnotation(a, new Position(l));
+				} catch (final BadLocationException e) {
+					// TODO Auto-generated catch block
+					e.printStackTrace();
+				}
+			}
+		});
+
+		final String property = System
+				.getProperty(ORG_ECLIPSE_E4_TOOLS_MODELEDITOR_FILTEREDTREE_ENABLED_XMITAB_DISABLED);
+		if (property != null || preferences.getBoolean("tab-form-search-show", true)) { //$NON-NLS-1$
+			sourceViewer.setEditable(false);
+			sourceViewer.getTextWidget().setEnabled(false);
+		}
+	}
+
+	/**
+	 *
+	 * @param text
+	 * @param startOffset
+	 * @return The endOFfset, or -1 if not found
+	 */
+	protected int searchAndHighlight(String text, int startOffset) {
+		try {
+			// select the entire start tag
+			IRegion region;
+			region = emfDocumentProvider.findText(text, startOffset);
+			if (region == null && startOffset > 0) {
+				region = emfDocumentProvider.findText(text, 0);
+			}
+			if (region != null) {
+				sourceViewer.setSelection(new TextSelection(region.getOffset(), region.getLength()), true);
+				return region.getOffset() + region.getLength();
+			}
+			sourceViewer.setSelection(new TextSelection(0, 0), true);
+			return -1;
+		} catch (final Exception e) {
+			e.printStackTrace();
+			return -1;
+		}
+	}
+
+	public IEclipseContext getContext() {
+		return context;
+	}
+
+	public void gotoEObject(EObject object) {
+		// select the entire start tag
+		final IRegion region = emfDocumentProvider.findStartTag(object);
+		if (region != null) {
+			sourceViewer.setSelection(new TextSelection(region.getOffset(), region.getLength()), true);
+		} else {
+			sourceViewer.setSelection(new TextSelection(0, 0), true);
+		}
+	}
+
+	public void paste() {
+		if (isFilterTextFocused()) {
+			text.paste();
+		} else {
+			sourceViewer.getTextWidget().paste();
+		}
+	}
+
+	public void copy() {
+		if (isFilterTextFocused()) {
+			text.copy();
+		} else {
+			sourceViewer.getTextWidget().copy();
+		}
+	}
+
+	public void cut() {
+		if (isFilterTextFocused()) {
+			text.cut();
+		} else {
+			sourceViewer.getTextWidget().cut();
+		}
+	}
+
+	private boolean isFilterTextFocused() {
+		return text.isFocusControl();
+	}
+
+}