Qt之QLabel

来源：互联网发布：js时间戳转时间对象编辑：程序博客网时间：2024/04/27 09:26

转自：http://blog.csdn.net/liang19890820/article/details/50866096

简述

QLabel提供了一个文本或图像的显示，没有提供用户交互功能。

一个QLabel可以包含以下任意内容类型：

内容设置纯文本使用setText()设置一个QString富文本使用setText()设置一个富文本的QString图像使用setPixmap()设置一个图像动画使用setMovie()设置一个动画数字使用setNum()设置int或double，并转换为纯文本。Nothing空的纯文本，默认的，使用clear()设置

简述
纯文本
- 显示
- 对齐方式
- 自动换行
- 设置行高
- 省略
- 垂直显示
富文本
图像
动画
数字
超链接
- 方法一
- 方法二
总结

纯文本

显示

这里写图片描述

首先我们构造一个QLabel对象，其中this为其所在的父窗体。通过调用setText可以为标签设置文本（Hello World），这时标签就可以正常显示出来了。为了显示更佳的效果，我们可以通过调用setStyleSheet来设置样式。color: white-顾名思义，就是为标签设置一个文本色（白色）。

<code class="language-Qt hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QLabel <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">*</span>pLabel <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">new</span> QLabel(this);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setText(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Hello World"</span>);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setStyleSheet(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"color: white"</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

对齐方式

默认的标签文本对齐方式为：左对齐、垂直居中，我们可以通过setAlignment来设置，包括：左、上、右、下、居中对齐，一般情况，我们会进行两两组合（水平方向、垂直方向）。比如：居中对齐

setAlignment(Qt::AlignCenter);

自动换行

如果文本过长，我们可以采用自动换行的方式来显示。

<code class="language-Qt hljs bash has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>WordWrap(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

这里写图片描述

注意：当使用英文的时候，如果写为类似形式”abcdefghijklmnopqrstuvwxyz”则是不能换行的，why？因为中间没有空格，所以需要写为”abcde fghij klmno pqrst uvwxyz”。

设置行高

一般情况下，自动换行之后文本上下行会距离比较近，我们可以通过下面方式来设置行高。

<code class="language-Qt hljs bash has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>WordWrap(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>);QString strText = QStringLiteral(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"一去二三里，烟村四五家。亭台六七座，八九十枝花。"</span>);QString strHeightText = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"<p style=\"line-height:%1%\">%2<p>"</span>;strText = strHeightText.arg(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">150</span>).arg(strText);pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>Text(strText);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

省略

如果过长，我们又不想换行，只想把其中一部分省略为…，那么我们可以通过QFontMetrics来实现，这里先不介绍QFontMetrics，感兴趣的童鞋可以先自行研究。

这里写图片描述

<code class="language-Qt hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QString strText <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> QStringLiteral(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"一去二三里，烟村四五家。亭台六七座，八九十枝花。"</span>);QString strElidedText <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>fontMetrics()<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>elidedText(strText, Qt<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;">::ElideRight</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>, Qt<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;">::TextShowMnemonic</span>);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setText(strElidedText);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

垂直显示

默认情况下，文本显示方式为水平方向，如果我们需要在垂直方向上显示，需要用一些小技巧来处理。

这里写图片描述

<code class="language-Qt hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QString strText <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> QStringLiteral(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"一去二三里，烟村四五家。"</span>);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setText(strText<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span>split(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span>, QString<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;">::SkipEmptyParts</span>)<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">.</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">join</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"\n"</span>));pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setAlignment(Qt<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;">::AlignCenter</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

富文本

我们可以在助手中查找关于Using HTML Markup in Text Widgets的资料，查看Qt支持哪些HTML标记。

下面我们来写一段HTML代码，O(∩_∩)O哈哈~。。。显示不同颜色的文本以及图片

这里写图片描述

<code class="language-Qt hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QString strHTML = QString("<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">html</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">head</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">style</span>></span><span class="css" style="box-sizing: border-box;"> \                           <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">font</span><span class="hljs-rules" style="box-sizing: border-box;">{<span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);">white</span></span>;<span class="hljs-rule" style="box-sizing: border-box;">}</span></span> <span class="hljs-id" style="box-sizing: border-box; color: rgb(155, 112, 63);">#f</span><span class="hljs-rules" style="box-sizing: border-box;">{<span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">font-size</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-number" style="box-sizing: border-box;">18</span>px</span></span>; <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> green</span></span>;<span class="hljs-rule" style="box-sizing: border-box;">}</span></span> \                           </span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">style</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">head</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">body</span>></span>\                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">font</span>></span>%1<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">font</span>></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">font</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">id</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">\"f\"</span>></span>%2<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">font</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">br</span>/></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">br</span>/></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">img</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">src</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">\":</span>/<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">Images</span>/<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">logo</span>\" <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">\"100\"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">\"100\"</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">body</span>></span> \                           <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">html</span>></span>").arg("I am a ").arg("Qter");pLabel->setText(strHTML);pLabel->setAlignment(Qt::AlignCenter);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

是不是很神奇？经常我们要用好几个控件来组合才能实现的功能，就仅仅几行HTML代码就搞定了。。。何乐而不为！

图像

首先我们构建一个QPixmap来作为显示的图片，然后设置标签的大小，可以通过setScaledContents按比例缩放图片达到理想的效果。

这里写图片描述

<code class="language-Qt hljs bash has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QPixmap pixmap(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">":/Images/logo"</span>);pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>Pixmap(pixmap);pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>FixedSize(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>);pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>ScaledContents(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

动画

这里我们需要使用另外一个类QMovie来控制动画，start()可以进行播放与stop()则可以停止，也可以通过调用setSpeed()来设置动画的播放速度。

这里写图片描述

<code class="language-Qt hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">QMovie <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">*</span>pMovie <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">=</span> <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">new</span> QMovie(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">":/Images/movie"</span>);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setMovie(pMovie);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setFixedSize(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">135</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>);pLabel<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>setScaledContents(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>);pMovie<span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">-></span>start();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

数字

如果我们需要显示一个数字，则可以调用setNum()，他可以将内容转换为纯文本。

<code class="language-Qt hljs bash has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">pLabel-><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">set</span>Num(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">66.6</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

很简单就一段代码，我们可以打开源码瞅瞅，究竟setNum是如何实现的。

<code class="language-Qt hljs axapta has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> QLabel::setNum(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> num){    QString <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">str</span>;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">str</span>.setNum(num);    setText(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">str</span>);}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

就三行代码，呵呵哒。。。超简单吧，我们要有一颗随时看源码的心！

超链接

我们需要简单使用标签<a></a>写一段简单的HTML超链接代码

方法一

比较简单，直接调用setOpenExternalLinks(true)即可。

<code class="language-Qt hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">pLabel-><span class="hljs-function" style="box-sizing: border-box;">setText(<span class="hljs-function" style="box-sizing: border-box;">QString(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"<a href = \"%1\">%2</a>"</span>)</span>.<span class="hljs-function" style="box-sizing: border-box;">arg(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://blog.csdn.net/liang19890820"</span>)</span>.<span class="hljs-function" style="box-sizing: border-box;">arg(<span class="hljs-function" style="box-sizing: border-box;">QStringLiteral(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"一去丶二三里"</span>)</span>)</span>)</span>;pLabel-><span class="hljs-function" style="box-sizing: border-box;">setOpenExternalLinks(true)</span>;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

方法二

声明一个槽openUrl，将其与linkActivated信号关联。

<code class="language-Qt hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">pLabel-><span class="hljs-function" style="box-sizing: border-box;">setText(<span class="hljs-function" style="box-sizing: border-box;">QString(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"<a href = \"%1\">%2</a>"</span>)</span>.<span class="hljs-function" style="box-sizing: border-box;">arg(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://blog.csdn.net/liang19890820"</span>)</span>.<span class="hljs-function" style="box-sizing: border-box;">arg(<span class="hljs-function" style="box-sizing: border-box;">QStringLiteral(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"一去丶二三里"</span>)</span>)</span>)</span>;<span class="hljs-function" style="box-sizing: border-box;">connect(pLabel, <span class="hljs-function" style="box-sizing: border-box;">SIGNAL(<span class="hljs-function" style="box-sizing: border-box;">linkActivated(QString)</span>)</span>, this, <span class="hljs-function" style="box-sizing: border-box;">SLOT(<span class="hljs-function" style="box-sizing: border-box;">openUrl(QString)</span>)</span>)</span>;void MainWindow<span class="hljs-value" style="box-sizing: border-box;">::openUrl(const QString &link){    QDesktopServices::openUrl(QUrl(link));</span>}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

总结

通过上面的学习，我们基本将标签的大部分用法都分享了，可以看出HTML、CSS的重要性，所以无论你现在所从事的工作是什么，或者以后做什么，我都建议好好研究下Web，技多不压身。。。上面的内容虽多，但都很简单，也很重要，所以都需要掌握，我们不只是Qter，我们更是工匠-精益求精、严谨、耐心，专注，坚持。

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