gistfile1.txt

    def initialize(composite, model)
      @composite, @model = composite, model
      tree_style = Swt::SWT::MULTI
      @viewer = JFace::Viewers::TreeViewer.new(@composite, tree_style)
      grid_data = Swt::Layout::GridData.new
      grid_data.grabExcessHorizontalSpace = true
      grid_data.horizontalAlignment = Swt::Layout::GridData::FILL
      grid_data.grabExcessVerticalSpace = true
      grid_data.verticalAlignment = Swt::Layout::GridData::FILL
      @viewer.get_tree.set_layout_data(grid_data)
      @composite.layout
      JFace::Viewers::ColumnViewerToolTipSupport.enableFor(@viewer)
      @viewer.set_content_provider(TreeMirrorContentProvider.new(self))
      #@viewer.getTree.setLinesVisible(true)
	    #@viewer.getTree.setHeaderVisible(true)
      @viewer.set_label_provider(TreeMirrorLabelProvider.new(self))
      @viewer.set_input(@model.tree_mirror)