about lineEdit #2
Description
问题：
LineEdit通过QDataWidgetMapper绑定了数据，希望显示的数据格式保留2位小数。比如500.00
` dataMap = new QDataWidgetMapper;
//给QDataWidgetMapper加载数据源
dataMap->setModel(repair_filter_model);
dataMap->addMapping(ui->lineEdit_Amount, 11);`
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