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关于嵌入式编程的tcl语法的资料

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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>Tk 命令，第二部分</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 页（共7 页）</nobr></font></td>
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<p>继续概述 Tk 命令，下一个是 <i>grid</i>，控制 Tk 窗口几何性质的接口。它用于在窗口中以行和列的格式安排小部件。				<i>lower</i>（和补充命令 <i>raise</i>）解决子窗口的可见性。下层（lowered）窗口不会遮掩与其重叠的兄弟窗口；上层（raised）窗口被带到最上层。在显示多个文档情形下会经常使用。许多 Tk 小部件和命令都使用一组公共的标准选项。可以使用 <i>option</i> 命令来查看或添加它们。</p>
<p>对于将小部件和子窗口放入窗口中，有两条命令：<i>pack</i> 和 <i>place</i>，它们都已演示过。其最简单的使用，<i>pack</i> 将一个或多个小部件添加到窗口，并将这些对象周围的窗口缩小至我们在本节开始部分的 Tk Hello 示例中所看到的那样，除非另有指明。<i>place</i> 使用相对或绝对尺寸来设置和显示父窗口中的对象，例如，从左边开始的 5 个像素，或窗口下一半（0.5）。</p>
<p>其它命令包括 <i>selection</i>，X 对象选择工具集的接口；<i>tk</i>，它提供对 Tk 解释器内部状态的所选择部分的访问；<i>winfo</i> 命令，用于检索有关 Tk 管理的窗口的数据；<i>wm</i>，正在运行窗口管理器的界面，用于设置从标题栏文本到所有类型的几何规范和约束的多个功能。</p>
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