一，如何给widget设置背景色

方法1：使用调色板

<span style="font-family:Arial;background-color: rgb(255, 255, 255);"></span> 

<span style="font-family:Arial;background-color: rgb(255, 255, 255);">1，设置widget属性：</span>

<span style="font-family:Arial;background-color: rgb(255, 255, 255);"> <span style="color:#000000;">setAutoFillBackground</span><span style="color:#000000;">(</span><span style="color:#80800;">true</span><span style="color:#000000;">);</span></span>

<span style="font-family:Arial;background-color: rgb(255, 255, 255);"></span> 

<span style="font-family:Arial;background-color: rgb(255, 255, 255);">2:，调色板</span>

<span style="color:#80080;">QPalette</span><span style="color:#c0c0c0;"> </span><span style="color:#000000;">palette</span><span style="color:#000000;">;</span><pre style="margin: 0px; text-indent: 0px; -qt-block-indent: 0;"><span style="color:#000000;">palette</span><span style="color:#000000;">.</span><span style="color:#000000;">setColor</span><span style="color:#000000;">(</span><span style="color:#80080;">QPalette</span><span style="color:#000000;">::</span><span style="color:#80080;">Background</span><span style="color:#000000;">,</span><span style="color:#c0c0c0;"> </span><span style="color:#80080;">QColor</span><span style="color:#000000;">(</span><span style="color:#0080;">231</span><span style="color:#000000;">,</span><span style="color:#c0c0c0;"> </span><span style="color:#0080;">231</span><span style="color:#000000;">,</span><span style="color:#c0c0c0;"> </span><span style="color:#0080;">231</span><span style="color:#000000;">));</span>

3，给widget设置调色板

setPalette(palette);

方法2：重写paintEvent事件函数

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