使用QPainter绘制圆形的QLineEdit

Question

我想绘制一个自定义QLineEdit尤其是一个圆形的QlineEdit 。

这是我的代码，但是执行应用程序时，无法编写自定义QlineEdit 。

linedit.h：

#ifndef LINEDIT_H
#define LINEDIT_H

#include <QWidget>
#include <QLineEdit>
#include <QPainter>
#include <QStyleOptionFrame>
#include <QRect>
class linedit : public QLineEdit
{
    Q_OBJECT
public:
    explicit linedit(QWidget *parent = 0);
    enum LineEditState{STATE_NOEMPTY, STATE_EMPTY};
    void setHintText(const QString &msg);
    void setPixmap(QString _pix_);
    QPixmap pixmap();

protected:
    void paintEvent       (QPaintEvent  *event);
    void focusInEvent     (QFocusEvent *event);
    void focusOutEvent    (QFocusEvent *event);

signals:

public slots:

private:
    LineEditState l_State;
    QString hintText;

};

#endif // LINEDIT_H

linedit.cpp

#include "linedit.h"

linedit::linedit(QWidget *parent) : QLineEdit(parent)
{
    l_State = STATE_EMPTY;
}

void linedit::setPixmap(QString _pix_)
{

}

QPixmap linedit::pixmap()
{

}

void linedit::setHintText(const QString &msg)
{
    hintText = msg;
    l_State = STATE_EMPTY;
    update();
}

void linedit::paintEvent(QPaintEvent  *event)
{
    QWidget::paintEvent(event);

    {
        /********** LineEdit's Font **********/
        QFont f;
        f.setPixelSize(21);
        f.setFamily("Josefin Sans");
        f.setBold(true);
        /************************************/

        QPainter painterContour(this);

        /************************************/
        QLineEdit qLine;
        QStyleOptionFrame option;
        initStyleOption(&option);
        option.initFrom(&qLine);
        //option.state |= QStyle::State_KeyboardFocusChange;
        option.rect = QRect(10,10,width()-20,height()-20);
        //option.lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth,&option,&qLine);
        //option.midLineWidth = 0;
        //option.state |= QStyle::State_Sunken;
        //option.features = QStyleOptionFrameV2::None;
        /************************************/

        painterContour.setFont(f);
        painterContour.setPen(QPen(QColor(171,173,174)));
        painterContour.setRenderHint(QPainter::Antialiasing);

        switch(l_State)
        {
        case STATE_EMPTY:
        {
            painterContour.setBrush(QBrush(QColor(255,255,255)));
            painterContour.drawRoundedRect(QRect(5,5,width()-10,height()-10),15,15);
            painterContour.drawText(option.rect,Qt::AlignLeft|Qt::AlignVCenter, hintText);
        }break;
        case STATE_NOEMPTY:
        {
           //painterContour.setBrush(QBrush(QColor(255,255,255)));
           //painterContour.drawRoundedRect(QRect(5,5,width()-10,height()-10),15,15);
        }break;
        }
        painterContour.end();

        style()->drawPrimitive(QStyle::PE_PanelLineEdit, &option, &painterContour, &qLine);
    }
}

void linedit::focusInEvent(QFocusEvent *event)
{
    QLineEdit::focusInEvent(event);
    //QWidget::focusInEvent(event);

    if(l_State == STATE_EMPTY)
    {
        l_State = STATE_NOEMPTY;
    }

    update();
}

void linedit::focusOutEvent(QFocusEvent *event)
{
    QLineEdit::focusOutEvent(event);

    if(l_State == STATE_EMPTY)
    {
        l_State = STATE_NOEMPTY;
    }

    update();
}

请您能帮我一下，非常感谢