added lazy loading of tool tip texts from the circuits

src/main/java/de/neemann/digital/draw/library/ElementLibrary.java

@@ -482,7 +482,7 @@ public class ElementLibrary implements Iterable<ElementLibrary.ElementContainer>
 
         /**
          * Returns the filename
-         * the retuned file is opened if the user wants to modify the element
+         * The returned file is opened if the user wants to modify the element
          *
          * @return the filename
          */

src/main/java/de/neemann/digital/draw/library/LibraryNode.java

@@ -9,6 +9,8 @@ import de.neemann.digital.draw.shapes.ShapeFactory;
 import de.neemann.digital.lang.Lang;
 import de.neemann.gui.IconCreator;
 import de.neemann.gui.LineBreaker;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.swing.*;
 import java.io.File;
@@ -21,6 +23,7 @@ import java.util.Iterator;
  * Created by hneemann on 25.03.17.
  */
 public class LibraryNode implements Iterable<LibraryNode> {
+    private static final Logger LOGGER = LoggerFactory.getLogger(LibraryNode.class);
     private static final Icon ICON_NOT_UNIQUE = IconCreator.create("testFailed.png");
 
     private final ArrayList<LibraryNode> children;
@@ -325,6 +328,7 @@ public class LibraryNode implements Iterable<LibraryNode> {
                 if (description == null) {
                     if (toolTipText == null) {
                         try {
+                            LOGGER.debug("load tooltip from "+file);
                             Circuit c = Circuit.loadCircuit(file, null);
                             toolTipText = c.getAttributes().get(Keys.DESCRIPTION);
                         } catch (Exception e) {

src/main/java/de/neemann/digital/gui/InsertAction.java

@@ -90,4 +90,25 @@ public final class InsertAction extends ToolTipAction {
     public LibraryNode getNode() {
         return node;
     }
+
+
+    /**
+     * Implements a lazy loading of the tooltips.
+     * Avoids the reading of all tooltips from the lib files if menu is created.
+     * This code ensures, that the tooltips are onli loaded from the file if the text is shown to the user.
+     *
+     * @return the JMenuItem created
+     */
+    @Override
+    public JMenuItem createJMenuItem() {
+        JMenuItem i = new JMenuItem(node.getTranslatedName(), getIcon()) {
+            @Override
+            public String getToolTipText() {
+                return node.getToolTipText();
+            }
+        };
+        i.addActionListener(InsertAction.this);
+        ToolTipManager.sharedInstance().registerComponent(i);
+        return i;
+    }
 }

src/main/java/de/neemann/digital/gui/LibrarySelector.java

@@ -83,9 +83,7 @@ public class LibrarySelector implements LibraryListener {
 
     private void addComponents(JMenu parts, LibraryNode node) {
         if (node.isLeaf()) {
-            parts.add(new InsertAction(node, insertHistory, circuitComponent, shapeFactory)
+            parts.add(new InsertAction(node, insertHistory, circuitComponent, shapeFactory).createJMenuItem());
-                    .setToolTip(node.getToolTipText())
-                    .createJMenuItem());
         } else {
             JMenu subMenu = new JMenu(node.getName());
             for (LibraryNode child : node)