title: SWT Component for choose file only from workspace
body: <p>I work with SWT and Eclipse's plugin. I need choose file only from workspace. I founded component for choose directory in workspace, component for choose file in file system, but i have not found component for choose file from workspace.</p>
  
  <p>Now I'm using <code>org.eclipse.swt.widgets.FileDialog</code> and set filter <code>setFilterPath(Platform.getLocation().toOSString())</code>. But the user can choose other file not from workspace. They should only be able to set files from within the workspace.</p>