Creating a eclipse plugin with text hover

Question

I would like to make a Eclipse plugin (text editor). I would \"read\" the text under the cursor and show a dynamical generated hover that depends on the text. N

Answer 1

Your fault is that you created a completly new Editor instead of a plugin for the existing Java Editor. Plugins will be activated via extension points. In your case you have to use org.eclipse.jdt.ui.javaEditorTextHovers more....

<plugin>
   <extension
         point="org.eclipse.jdt.ui.javaEditorTextHovers">
      <hover
            activate="true"
            class="path.to_your.hoverclass"
            id="id.path.to_your.hoverclass">
      </hover>
   </extension>

</plugin>

The class argument holds the path to your Class that implements IJavaEditorTextHover.

public class LangHover implements IJavaEditorTextHover
{
    @Override
    public String getHoverInfo(ITextViewer textviewer, IRegion region)
    {
         if(youWantToShowAOwnHover)
           return "Your own hover Text goes here"";
         return null; // Shows the default Hover (Java Docs)
    }
}

That should do it ;-)