1 files changed, 89 insertions, 0 deletions
diff --git a/plugins/org.eclipse.etrice.core.common.ui/src/org/eclipse/etrice/core/common/ui/hover/KeywordHoverProvider.java b/plugins/org.eclipse.etrice.core.common.ui/src/org/eclipse/etrice/core/common/ui/hover/KeywordHoverProvider.java
new file mode 100644
index 000000000..35704c7a8
--- /dev/null
+++ b/plugins/org.eclipse.etrice.core.common.ui/src/org/eclipse/etrice/core/common/ui/hover/KeywordHoverProvider.java
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright (c) 2015 protos software gmbh (http://www.protos.de).
+ * 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:
+ * 		https://borisdevnotes.wordpress.com/2014/02/28/xtext-usability-hovers-on-keywords/
+ * 		Juergen Haug (initial contribution)
+ * 
+ *******************************************************************************/
+
+package org.eclipse.etrice.core.common.ui.hover;
+
+import java.io.IOException;
+import java.net.URL;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.etrice.core.common.ui.ETriceCoreCommonActivator;
+import org.eclipse.jface.internal.text.html.HTMLPrinter;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.ui.plugin.AbstractUIPlugin;
+import org.eclipse.xtext.Keyword;
+import org.eclipse.xtext.ui.editor.hover.html.DefaultEObjectHoverProvider;
+import org.eclipse.xtext.ui.editor.hover.html.XtextBrowserInformationControlInput;
+import org.eclipse.xtext.util.Files;
+
+import com.google.inject.Inject;
+import com.google.inject.name.Named;
+
+@SuppressWarnings("restriction")
+public class KeywordHoverProvider extends DefaultEObjectHoverProvider {
+	
+	public final static String STYLE_SHEET_KEY = "keywordHoverStyleSheetFileName";
+
+	@Inject(optional=true) @Named(STYLE_SHEET_KEY)
+	private String styleSheetFileName;
+
+	@Inject
+	protected AbstractUIPlugin plugin;
+	
+	@Inject
+	protected ILabelProvider labelProvider;
+	
+	@Inject
+	protected IKeywordHoverContentProvider contentProvider;
+
+	private String styleSheet = null;
+
+	@Override
+	protected XtextBrowserInformationControlInput getHoverInfo(EObject element, IRegion hoverRegion,
+			XtextBrowserInformationControlInput previous) {
+		if (element instanceof Keyword) {
+			Keyword keyword = (Keyword) element;
+			String html = contentProvider.getHTMLContent(keyword.getValue());
+			if (html != null) {
+				StringBuffer buffer = new StringBuffer(html);
+				HTMLPrinter.insertPageProlog(buffer, 0, getKeywordStyleSheet());
+				HTMLPrinter.addPageEpilog(buffer);
+				return new XtextBrowserInformationControlInput(previous, element, buffer.toString(), labelProvider);
+			}
+		}
+		return super.getHoverInfo(element, hoverRegion, previous);
+	}
+
+	protected String getKeywordStyleSheet() {
+		String superStyle = super.getStyleSheet();
+		if (styleSheet == null) {
+			styleSheet = "";
+			try {
+				URL url = null;
+				if(plugin != null && styleSheetFileName != null) {
+					url = plugin.getBundle().getEntry(styleSheetFileName);
+				}
+				else {
+					url = ETriceCoreCommonActivator.getInstance().getBundle().getEntry("/eTriceKeywordHoverStyle.css");
+				}
+				styleSheet = Files.readStreamIntoString(url.openStream());
+			}
+			catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+
+		return superStyle + styleSheet;
+	}
+}