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19.2.1 大小和位置
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19.2.1 大小和位置
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-US">19.2.1 </span><span style="FONT-FAMILY: 黑体">大小和位置</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">控件的大小和位置由属性</span><span lang="EN-US">Height</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Width</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Top</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Bottom</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Left</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Right</span><span style="FONT-FAMILY: 宋体">以及辅助属性</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">Location</span><span style="FONT-FAMILY: 宋体">确定。区别是</span><span lang="EN-US">Height</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Width</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Top</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Bottom</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Left</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Right</span><span style="FONT-FAMILY: 宋体">属性值都是一个整数，而</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">的值使用一个</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构来表示，</span><span lang="EN-US">Location</span><span style="FONT-FAMILY: 宋体">的值使用一个</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构来表示。</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构和</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构都包含</span><span lang="EN-US">XY</span><span style="FONT-FAMILY: 宋体">坐标。</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构一般相对于一个位置，而</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构是对象的高和宽。</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">都位于</span><span lang="EN-US">System.Drawing</span><span style="FONT-FAMILY: 宋体">命名空间。它们非常类似，因为它们都提供了</span><span lang="EN-US">XY</span><span style="FONT-FAMILY: 宋体">坐标对，还拥有用于简单的比较和转换的重写运算符。例如，可以对两个</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构执行相加操作。对于</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构，加法运算符已进行了重写，可以把</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构加到</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构上，得到一个新的</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span lang="EN-US">Bounds</span><span style="FONT-FAMILY: 宋体">属性返回一个</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">对象，它表示一个控件区域。这个区域包含滚动条和标题栏。</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">也位于</span><span lang="EN-US">System.Drawing</span><span style="FONT-FAMILY: 宋体">命名空间。</span><span lang="EN-US">ClientSize</span><span style="FONT-FAMILY: 宋体">属性是一个</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">结构，表示控件的客户区域，不包含滚动条和标题栏。</span></p>
<p class="MsoNormal"><span lang="EN-US">PointToClient</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">PointToScreen</span><span style="FONT-FAMILY: 宋体">方法是方便的转换方法，它们的参数是</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构，返回一个</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构。</span><span lang="EN-US">PointToClient</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">参数表示屏幕坐标，该方法把屏幕坐标转换为基于当前客户对象的坐标。这非常便于进行拖放操作。</span><span lang="EN-US">PointToScreen</span><span style="FONT-FAMILY: 宋体">正好与之相反，它提取客户对象的坐标，把它们转换为屏幕坐标。还有</span><span lang="EN-US">RectangleToScreen</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">ScreenToRectangle</span><span style="FONT-FAMILY: 宋体">方法，它们具有相同的功能，只是用</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">结构代替</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">结构。</span></p>
<p class="MsoNormal"><span lang="EN-US">Dock</span><span style="FONT-FAMILY: 宋体">属性确定子控件停放在父控件的哪条边上。</span><span lang="EN-US">DockStyle</span><span style="FONT-FAMILY: 宋体">枚举值用作其属性值。这个值可以是</span><span lang="EN-US">Top</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Bottom</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Right</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Left</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Fill</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">None</span><span style="FONT-FAMILY: 宋体">。</span><span lang="EN-US">Fill</span><span style="FONT-FAMILY: 宋体">会使控件的大小正好匹配父控件的客户</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 宋体">区域。</span></p>
<p class="MsoNormal"><span lang="EN-US">Anchor</span><span style="FONT-FAMILY: 宋体">属性把子控件的一条边与父控件的一条边对齐，这与停靠不同，因为它不设置父控件的一条边，而是把到该边界的当前距离设置为常量。例如，如果把子控件的右边界与父控件的右边界对齐，并重新设置父控件的大小，子控件右边界到父控件右边界的距离将保持不变。</span><span lang="EN-US">Anchor</span><span style="FONT-FAMILY: 宋体">属性采用</span><span lang="EN-US">AnchorStyles</span><span style="FONT-FAMILY: 宋体">枚举的值，其值是</span><span lang="EN-US">Top</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Bottom</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Right</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Left</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">None</span><span style="FONT-FAMILY: 宋体">。通过设置该属性值，可以在重新设置父控件的大小时，动态地设置子控件的大小。这样，当用户重新设置窗体的大小时，按钮和文本框就不会被剪切或隐藏。</span></p></div>
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