QT4.8用Qwidget重写或者实现图片按钮+圆角算法的实现

#ifndef NIMAGEBUTTON_H#define NIMAGEBUTTON_H #include <QWidget>#include <QPixmap>#include <QPainter>#include <QTimer>#include <QMouseEvent>#include "QTool.h"#define  CLICKED_OUT_TIME 3500/***图片按钮*/class NImageButton : public QWidget{	Q_OBJECTpublic:	NImageButton(QWidget *parent=0);	~NImageButton();	//设置图片路劲	bool setNormalImage(QString filePath);	bool setPRessImage(QString filePath);	//设置图片	bool setNormalImage(QPixmap& image);	bool setPressImage(QPixmap &image);	//设置图片的圆角弧度	void setImageArc(float arc);protected:	//重绘事件	virtual void paintEvent(QPaintEvent *event);	//鼠标事件	virtual void mousePressEvent(QMouseEvent *event);	virtual void mouseMoveEvent(QMouseEvent *event);	virtual void mouseReleaseEvent(QMouseEvent *event);	 virtual void mouseDoubleClickEvent(QMouseEvent *event);private:	void drawImageButton(QPainter &painter);	//当前是否已发送点击事件	bool isClickedSendEmit;	//长按定时	QTimer * m_pTimer;	//按钮状态	enum	{		IMAGE_BUTTON_DWON=0,IMAGE_BUTTON_UP,IMAGE_BUTTON_MOVE 	};	//图片状态	int nButtonStatus;	//圆角弧度	float fArc;	//正常显示图片	QPixmap *m_normalShowImg;	//按下显示图片	QPixmap *m_pressShowImg;	//信号实现signals:	//单击	void clicked();	//双击	void doubleClicked();	//长按	void longClicked();private slots:	void onClickedOutTime();};#endif // NIMAGEBUTTON_H其次时cpp文件：
#include "NImageButton.h"NImageButton::NImageButton(QWidget *parent)	: QWidget(parent),m_normalShowImg(NULL),m_pressShowImg(NULL),	nButtonStatus(IMAGE_BUTTON_UP),fArc(0),m_pTimer(NULL){ 	m_pTimer=new QTimer (this);	connect(m_pTimer,SIGNAL(timeout()),this,SLOT(onClickedOutTime()));} //长按超时void NImageButton::onClickedOutTime(){	m_pTimer->stop();	isClickedSendEmit = true;	emit longClicked();}/**设置普通图片路劲,图片不存在将返回false*/bool NImageButton::setNormalImage(QString filePath){	bool isFileExits = QFile::exists(filePath);	if (!isFileExits)	{		return false;	}	if (m_normalShowImg == NULL)	{		m_normalShowImg = new QPixmap();	}	else	{		if (m_normalShowImg != NULL)		{			delete m_normalShowImg;			m_normalShowImg = new QPixmap();		} 	}	isFileExits = m_normalShowImg->load(filePath);	update();	return isFileExits;}/**设置按下去图片路劲,图片不存在将返回false*/bool NImageButton::setPressImage(QString filePath){	bool isFileExits =QFile::exists(filePath);	if (!isFileExits)	{		return false;	}	if (m_pressShowImg == NULL)	{		m_pressShowImg = new QPixmap();	}	else	{		if (m_pressShowImg != NULL)		{			delete m_pressShowImg;			m_pressShowImg = new QPixmap();		} 	}	return m_pressShowImg->load(filePath);}/**设置普通图片,图片设置失败将返回false*/bool NImageButton::setNormalImage(QPixmap &image){	if (m_normalShowImg == NULL)	{		m_normalShowImg = new QPixmap(image);	}	else	{		if (m_normalShowImg != NULL)		{			delete m_normalShowImg;			m_normalShowImg = new QPixmap(image);		} 	}	return true;}/**设置按下图片,图片设置失败将返回false*/bool NImageButton::setPressImage(QPixmap &image){	if (m_pressShowImg == NULL)	{		m_pressShowImg = new QPixmap(image);	}	else	{		if (m_pressShowImg != NULL)		{			delete m_pressShowImg;			m_pressShowImg = new QPixmap(image);		} 	}	return true;}//设置按钮弧度void NImageButton::setImageArc(float arc){	fArc = arc;}void NImageButton::mousePressEvent(QMouseEvent *event){	isClickedSendEmit = false;	m_pTimer->start(CLICKED_OUT_TIME);	nButtonStatus = IMAGE_BUTTON_DWON;	update();	QWidget::mousePressEvent(event);}void NImageButton::mouseMoveEvent(QMouseEvent *event){	nButtonStatus = IMAGE_BUTTON_MOVE;	update();	QWidget::mouseMoveEvent(event);}//双击事件void NImageButton::mouseDoubleClickEvent(QMouseEvent *event){	emit doubleClicked();	isClickedSendEmit=true;	QWidget::mouseDoubleClickEvent(event);}void NImageButton::mouseReleaseEvent(QMouseEvent *event){	m_pTimer->stop();	nButtonStatus = IMAGE_BUTTON_UP;	update();	//如果没有发送点击事件就发送	if (!isClickedSendEmit)	{		emit clicked();	}	QWidget::mouseReleaseEvent(event);}void NImageButton::paintEvent(QPaintEvent *event){	QPainter painter(this);	drawImageButton(painter);	painter.setPen(QColor(Qt::white)); 	QWidget::paintEvent(event);}NImageButton::~NImageButton(){}void NImageButton::drawImageButton(QPainter &painter){	QPixmap nowImage(size());	if(nButtonStatus == IMAGE_BUTTON_UP)	{		if (m_normalShowImg != NULL)		{			nowImage =m_normalShowImg->scaled(width(),height());		}	}	else if (nButtonStatus == IMAGE_BUTTON_DWON)	{		if (m_pressShowImg != NULL)		{			nowImage =m_pressShowImg->scaled(width(),height());		}	}	else if(nButtonStatus == IMAGE_BUTTON_MOVE)	{		if (m_normalShowImg != NULL )		{			nowImage =m_normalShowImg->scaled(width(),height());		}	}	painter.setPen(Qt::NoPen);	painter.setRenderHint(QPainter::Antialiasing); // 反锯齿;	nowImage=QTool::QPixmapToRound(nowImage,fArc);	painter.drawPixmap(0,0,nowImage); }如何使用：（注意图片是博主自己的你们可以自己放自己的）
NImageButton *pNImageButton = new NImageButton(this);pNImageButton->setGeometry(10,10,120,35); pNImageButton->setMinimumSize(120,35);QPixmap pp("Image/button.png");QPixmap ppc("Image/button1.png");pNImageButton->setNormalImage(pp);pNImageButton->setPressImage(ppc); pNImageButton->setImageArc(10);注意博主使用了圆角算法，：
//图片圆角算法QPixmap QTool::QPixmapToRound(const QPixmap & img, int radius){	if (img.isNull())	{		return QPixmap();	}	QSize size(img.size());	QBitmap mask(size);	QPainter painter(&mask);	painter.setRenderHint(QPainter::Antialiasing);	painter.setRenderHint(QPainter::SmoothPixmapTransform);	painter.fillRect(mask.rect(), Qt::white);	painter.setBrush(QColor(0, 0, 0));	painter.drawRoundedRect(mask.rect(), radius, radius);	QPixmap image = img;// .scaled(size);	image.setMask(mask);	return image;}来张效果图：博主的下一个重写控件预览（这周即将发布，也是重写的Qwidget）希望大家喜欢：