qt带后缀单位的QLineEdit

QLineEditUnit.h

#pragma once
#include <QLineEdit>
#include <QPushButton>

class QLineEditUnit : public QLineEdit
{
    Q_OBJECT
public:
    QLineEditUnit(QWidget* parent = Q_NULLPTR);
    ~QLineEditUnit();
    //获取编辑框单位
    QString UnitText()const;

    //设置编辑框单位
    void SetUnitText(const QString& unitText);

private:
    QPushButton* m_unitButton = nullptr;//单位文本按钮
};

QUnitLineEdit.cpp

#include "QLineEditUnit.h"
#include <QLayout>
#include <QStyle>
QLineEditUnit::QLineEditUnit(QWidget* parent) : QLineEdit(parent)
{
    m_unitButton = new QPushButton;
    //单位按钮扁平无边框
    m_unitButton->setStyleSheet("border-style:solid;color: rgba(77, 155, 213, 1);");
    m_unitButton->setFlat(true);
    //单位加入布局
    QBoxLayout* layout = new QBoxLayout(QBoxLayout::LeftToRight);
    layout->addStretch();
    layout->setSpacing(0);
    //单位按钮的Margins
    //右边留了13px，留给单位(按钮)
    layout->setContentsMargins(0, 0, 13, 0);
    layout->addWidget(m_unitButton);
    this->setLayout(layout);
}

QLineEditUnit::~QLineEditUnit()
{
}

QString QLineEditUnit::UnitText() const
{
    return   this->m_unitButton->text();
}

void QLineEditUnit::SetUnitText(const QString& unitText)
{
    if (unitText.isEmpty() || this->m_unitButton->text() == unitText)
    {
        return;
    }

    
    m_unitButton->setFont(this->font());
    this->m_unitButton->setText(unitText);
    // this->m_unitButton->setVisible(true);
    //获得文字的宽度
    int width = this->fontMetrics().width(m_unitButton->text());
    m_unitButton->setFixedWidth(width);
    //到单位开头了就往下显示，防止往后输入的内容有一部分在按钮下面
    QBoxLayout* layout = (QBoxLayout*)this->layout();
    QMargins margins = layout->contentsMargins();
    setTextMargins(margins.left(), margins.top(), width + margins.right(), margins.bottom());
}

然后再界面，先拖拽一个lineEdit，然后右键提升

所有的lineEdit都提升为带单位的

把lineEdit的指针强制类型转换成带单位的指针
其实好像我做的强制类型转换没什么必要，多此一举
可以直接用