Qt 自定义PushButton

#include "pushbutton.h"

#include <QPainter>
#include <QMouseEvent>
#include <QFontMetrics>
#include <QLabel>

PushButton::PushButton(QString normal, QString hover, QString pressed, QWidget *parent) :
QPushButton(parent)
{
buttonState = Normal;

normalPixmap.load(normal);
hoverPixmap.load(hover);
pressPixmap.load(pressed);

this->setFixedSize(normalPixmap.size());

this->setContentsMargins(0, 0, 0, 0);
}

PushButton::PushButton(QString background, QWidget *parent) :
QPushButton(parent)
{
buttonState = Normal;

normalPixmap.load(background);
hoverPixmap.load(background);
pressPixmap.load(background);

this->setFixedSize(normalPixmap.size());

this->setContentsMargins(0, 0, 0, 0);
}

PushButton::~PushButton()
{

}

void PushButton::paintEvent(QPaintEvent *)
{
QPainter painter(this);

switch(buttonState)
{
case Normal:
painter.drawPixmap(this->rect(), normalPixmap);
break;
case Hover:
painter.drawPixmap(this->rect(), hoverPixmap);
break;
case Pressed:
painter.drawPixmap(this->rect(), pressPixmap);
}

painter.drawText(this->rect(), Qt::AlignCenter, this->text());
}

void PushButton::enterEvent(QEvent *)
{
buttonState = Hover;
update();
}

void PushButton::leaveEvent(QEvent *)
{
buttonState = Normal;
update();
}

void PushButton::mousePressEvent(QMouseEvent *e)
{
if(e->button() == Qt::LeftButton)
{
buttonState = Pressed;
update();
}
}

bool PushButton::isOnPushButton(const QPoint &point, const PushButton *pushButton)
{
if(point.x() < 0 || point.x() > pushButton->width() ||
point.y() < 0 || point.y() > pushButton->height())
{
return false;
}
return true;
}

void PushButton::mouseReleaseEvent(QMouseEvent *e)
{
if(e->button() == Qt::LeftButton)
{
//判断鼠标抬起时是否在PushButton之上
if(isOnPushButton(e->pos(), this))
{
emit clicked();
}

buttonState = Hover;
update();
}
}

#ifndef PUSHBUTTON_H
#define PUSHBUTTON_H
#include <QPushButton>

#define Normal 0
#define Hover 1
#define Pressed 2
class QPixmap;

class PushButton : public QPushButton
{
//Q_OBJECT
public:
explicit PushButton(QString normal, QString hover, QString pressed, QWidget *parent=0);
explicit PushButton(QString background, QWidget *parent=0);
~PushButton();
bool isOnPushButton(const QPoint &point, const PushButton *pushButton);

protected:
void paintEvent(QPaintEvent *);
void enterEvent(QEvent *);
void leaveEvent(QEvent *);
void mousePressEvent(QMouseEvent *e);
void mouseReleaseEvent(QMouseEvent *e);
//void loadPixmap(QString path);

private:
char buttonState;
QPixmap normalPixmap;
QPixmap hoverPixmap;
QPixmap pressPixmap;
};

#endif // PUSHBUTTON_H

PushButton *xxx = new PushButton(":/image/contact.png",":/image/cut-the-rope.png",":/image/drop.png",this);