IDL.GUI之树形表案例

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树形表的组件窗口、根枝叶都是由widget_tree生成，他们的区别在于父子关系不同
/FOLDER表示该节点是个“文件夹节点”，里面是包含子节点的
/EXPANDED表示可以对该“文件夹节点”进行展开和折叠
/FOLDER和/EXPANDED应该是搭配使用，文件夹节点岂能不允许打开！

wTLB = WIDGET_BASE(/COLUMN, TITLE='title')
  wTree = WIDGET_TREE(wTLB)
  wtRoot = WIDGET_TREE(wTree, VALUE='root', /FOLDER, /EXPANDED)
  wtLeaf11 = WIDGET_TREE(wtRoot, VALUE='leaf', $
    UVALUE='LEAF')
  wtBranch12 = WIDGET_TREE(wtRoot, VALUE='branch', $
    /FOLDER, /EXPANDED)
  wtLeaf121 = WIDGET_TREE(wtBranch12, VALUE='leaf', $
    UVALUE='LEAF')
  wtLeaf122 = WIDGET_TREE(wtBranch12, VALUE='leaf', $
    UVALUE='LEAF')
  wtLeaf13 = WIDGET_TREE(wtRoot, VALUE='leaf', $
    UVALUE='LEAF')
  wtLeaf14 = WIDGET_TREE(wtRoot, VALUE='leaf', $
    UVALUE='LEAF')   
     ;下面这个按钮不在树形表内
  wDone = WIDGET_BUTTON(wTLB, VALUE="press", UVALUE='DONE')  
  WIDGET_CONTROL, wTLB, /REALIZE