--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.ui.text.java.hover;
+
+import net.sourceforge.phpdt.internal.ui.text.JavaWordFinder;
+import net.sourceforge.phpdt.ui.text.java.hover.IJavaEditorTextHover;
+
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.information.IInformationProvider;
+import org.eclipse.ui.IEditorPart;
+import org.eclipse.ui.IPartListener;
+import org.eclipse.ui.IPerspectiveDescriptor;
+import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.ui.IWorkbenchWindow;
+
+public class JavaInformationProvider implements IInformationProvider {
+
+ class EditorWatcher implements IPartListener {
+
+ /**
+ * @see IPartListener#partOpened(IWorkbenchPart)
+ */
+ public void partOpened(IWorkbenchPart part) {
+ }
+
+ /**
+ * @see IPartListener#partDeactivated(IWorkbenchPart)
+ */
+ public void partDeactivated(IWorkbenchPart part) {
+ }
+
+ /**
+ * @see IPartListener#partClosed(IWorkbenchPart)
+ */
+ public void partClosed(IWorkbenchPart part) {
+ if (part == fEditor) {
+ fEditor.getSite().getWorkbenchWindow().getPartService()
+ .removePartListener(fPartListener);
+ fPartListener = null;
+ }
+ }
+
+ /**
+ * @see IPartListener#partActivated(IWorkbenchPart)
+ */
+ public void partActivated(IWorkbenchPart part) {
+ update();
+ }
+
+ public void partBroughtToTop(IWorkbenchPart part) {
+ update();
+ }
+ }
+
+ protected IEditorPart fEditor;
+
+ protected IPartListener fPartListener;
+
+ protected String fCurrentPerspective;
+
+ protected IJavaEditorTextHover fImplementation;
+
+ public JavaInformationProvider(IEditorPart editor) {
+
+ fEditor = editor;
+
+ if (fEditor != null) {
+
+ fPartListener = new EditorWatcher();
+ IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
+ window.getPartService().addPartListener(fPartListener);
+
+ update();
+ }
+ }
+
+ protected void update() {
+
+ IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
+ IWorkbenchPage page = window.getActivePage();
+ if (page != null) {
+
+ IPerspectiveDescriptor perspective = page.getPerspective();
+ if (perspective != null) {
+ String perspectiveId = perspective.getId();
+
+ if (fCurrentPerspective == null
+ || fCurrentPerspective != perspectiveId) {
+ fCurrentPerspective = perspectiveId;
+
+ fImplementation = new JavaTypeHover();
+ fImplementation.setEditor(fEditor);
+ }
+ }
+ }
+ }
+
+ /*
+ * @see IInformationProvider#getSubject(ITextViewer, int)
+ */
+ public IRegion getSubject(ITextViewer textViewer, int offset) {
+
+ if (textViewer != null)
+ return JavaWordFinder.findWord(textViewer.getDocument(), offset);
+
+ return null;
+ }
+
+ /*
+ * @see IInformationProvider#getInformation(ITextViewer, IRegion)
+ */
+ public String getInformation(ITextViewer textViewer, IRegion subject) {
+ if (fImplementation != null) {
+ String s = fImplementation.getHoverInfo(textViewer, subject);
+ if (s != null && s.trim().length() > 0)
+ return s;
+ }
+
+ return null;
+ }
+}