Qt 自绘按钮控件

Qt5 自绘按钮控件，实现高度个性化的功能。核心思想是重写paintEvent等各种事件处理函数，根据当前状态在QPaintDevice上绘制图像。

效果：

pic1

MPushButton.h

#ifndef MPUSHBUTTON_H
#define MPUSHBUTTON_H

#include <QPushButton>
#include <QLineEdit>

class MPushButton : public QPushButton
{
    Q_OBJECT

public:
    MPushButton(QWidget *parent = nullptr);
    ~MPushButton() override;

protected:
    void paintEvent(QPaintEvent *event) override;
    void enterEvent(QEvent *event) override;
    void leaveEvent(QEvent *event) override;
    void mousePressEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;
    bool isHover = false;
    bool isPressed = false;
};

#endif // MPUSHBUTTON_H

MPushButton.cpp

#include <QPainter>
#include <QPen>
#include <QBrush>
#include <QColor>
#include <QRect>
#include <QDebug>
#include "MPushButton.h"

MPushButton::MPushButton(QWidget *parent)
    : QPushButton(parent)
{
}

MPushButton::~MPushButton()
{
}

void MPushButton::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    QColor blue;
    if (isHover)
        blue.setRgb(93, 173, 226);
    else
        blue.setRgb(53, 152, 219);

    if (isPressed)
        blue.setRgb(46, 134, 193);

    // draw background of the button
    QBrush brush(blue);
    painter.setPen(Qt::NoPen);
    painter.setBrush(brush);
    painter.drawRoundedRect(QRectF(0,0, this->width() , this->height()), 15, 15);
    // draw text
    painter.setPen(QPen(QColor(215, 219, 221)));
    painter.setFont(font());
    painter.drawText(rect(), Qt::AlignCenter, text());

}

void MPushButton::enterEvent(QEvent *event)
{
    isHover = true;
    QPushButton::enterEvent(event);
}

void MPushButton::leaveEvent(QEvent *event)
{
    isHover = false;
    QPushButton::leaveEvent(event);

}

void MPushButton::mousePressEvent(QMouseEvent *event)
{
    isPressed = true;
    QPushButton::mousePressEvent(event);
    move(this->x(), this->y() + 5);
}

void MPushButton::mouseReleaseEvent(QMouseEvent *event)
{
    isPressed = false;
    QPushButton::mouseReleaseEvent(event);
    move(this->x(), this->y() - 5);
}