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构建定制的树型视图

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href="/developerWorks/education/java/">教学 - 在线课程</a></font><br x="7"><img src="imagemaster/masthead.jpg" alt="构建定制的树型视图"></td><td width="*" valign="bottom" align="right"><a border="0" href="../MagnitudeTree.zip"><img alt="下载教程 zip 文件" border="0" src="../i/icon-zip.gif"></a><a href=../MagnitudeTree_eng/index.html target=_blank><img alt="英文原文" border="0" src="../i/icon-source.gif"></a></td></tr><tr><td height="2" colspan="2"><img height="2" width="1" src="../i/c.gif"></td></tr></table><TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD></TR><TR><TD background="../i/sw-gold.gif"><a border="0" href="index.html" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="topmain"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index2.html"><img alt="章节菜单" border="0" src="../i/section.gif" name="topsection"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="MagnitudeTree-7-4.html"><img alt="提交反馈意见" border="0" src="../i/feedback.gif" name="topfeedback"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="MagnitudeTree-2-1.html"><img alt="上一屏" border="0" src="../i/previous.gif" name="topprevious"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topnext'); iOver('bottomnext'); self.status=nextblurb; return true;" onMouseOut="iOut('topnext'); iOut('bottomnext'); self.status=''; return true;" href="MagnitudeTree-2-3.html"><img alt="下一屏" border="0" src="../i/next.gif" name="topnext"></a></TD></TR></TABLE><table bgcolor="ffffff" cellspacing="0" cellpadding="2" border="0" height="400" width="100%"><tr valign="bottom"><a name="navskip"></a><td height="25" colspan="4"><img border="0" height="25" width="562" src="imagemaster/titlebar2.jpg" alt="2. Swing 树型视图"></td></tr><tr><td bgcolor="ffffff" width="15">&nbsp;</td><td bgcolor="ffffff" width="12">&nbsp;</td><td valign="top" align="left" bgcolor="ffffff" width="*"><p><br x="7"><table cellspacing="0" cellpadding="0" border="0"><tr><td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>“模型-视图-控制器”和 Swing</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>    第 2 页（共 11 页）</nobr></font></td></tr></table><br x="7"><br x="7"></p><font size="2" face="Verdana, Arial, Helvetica"><p>
SmallTalk 80 系统最初介绍了“模型-视图-控制器”设计模式。它为将用户界面和控制机制与显示的信息相分离提供了一种方法。
          </p><p>
            <img alt="“模型-视图-控制器”角色" src="images/mvc.gif">
            <br x="7">             图 2.1. “模型-视图-控制器”模式</p><p>
在图 2.1 中，显示了 MVC 模式中三个主要的角色。
            <ul><li>
<b>模型</b>封装了树的数据和行为。从它到“视图”的箭头表示可以使用另一种设计模式，如“观察器”，将它自身的更改通知任何已注册的“视图”。“模型”对注册树的（一个或多个）“视图”的特定知识毫无所知，只知道可以告诉它们已经发生更改。</li><li>
<b>视图</b>以它选择的任何方式显示属于“模型”的信息。MVC 有许多不同的视图，以及不同的显示样式，其优点是可以向“模型”注册。“视图”是在确切了解“模型”的基础上设计的，所以它知道如何从“模型”中检索状态信息。“视图”可以为用户交互提供界面物件，以及对任何指派给“控制器”的交互提供响应。</li><li>
<b>控制器</b>通常知道如何处理用户与“视图”中一个、一些或所有物件的交互。“视图”和“控制器”之间的关系比它们与“模型”的关系更密切。“控制器”解释用户交互并将它们转换成“模型”更新，然后可能依次触发“视图”更新。</li></ul>
与数据一起使用的 Swing 组件使用 MVC 模式，包括保存组件状态和行为的“模型”类和管理显示和交互细节的
Look &amp; Feel 类（有效扮演 MVC“控制器”的角色）。Swing 树型视图符合这种模式；本教程稍后将详细说明与树型视图相关的模型和视图类。
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