Qt 自定义PushButton

功能：鼠标弹起并在按键区域内时，按键响应。并实现normal、hover、pressed效果，PushButton大小默认为传入图片大小。
PushButton的normal、hover、pressed效果没有使用QSS实现，因为重写mouseReleaseEvent后，qss的hover效果混乱。

用法：
[cpp] view plain copy
loginButton = new PushButton(“:/button/login_button_normal”,
“:/button/login_button_hover”,
“:/button/login_button_pressed”);

或者：
[cpp] view plain copy
loginButton = new PushButton(“:/button/login_button”);

效果：

具体实现：
[cpp] view plain copy
**#include “pushbutton.h”

**#include
**#include
**#include
**#include

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);  

}

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

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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 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();  
}  

}