QT：三态按钮

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三态按钮（普通态，鼠标停留态，点击态）在设计炫丽界时是很常用的一项功能，但QT并没有直接支持这个功能，只好自己写一个了，通过继承QToolButton实现。

上代码：

#include <QtGui>class CoolButton : public QToolButton{Q_OBJECTprivate:QIcon m_NormalIcon;QIcon m_FocusIcon;QIcon m_PressedIcon;protected:void enterEvent(QEvent *event);void leaveEvent(QEvent *event);void mousePressEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);public:CoolButton(QWidget *parent = 0);virtual ~CoolButton();void SetButtonIcons(const QIcon &normal, const QIcon &focus = QIcon(),const QIcon &pressed = QIcon() );};CoolButton::CoolButton(QWidget *parent): QToolButton(parent){//为了让图标看起来自然一点而设置了这两个操作setDown(false);setFocusPolicy(Qt::NoFocus);}CoolButton::~CoolButton(){}//重载“进入”和“离开”事件，进入时切换为另一个图标，离开时还原void CoolButton::enterEvent(QEvent *event){if( isEnabled() && !m_FocusIcon.isNull() )setIcon(m_FocusIcon);}void CoolButton::leaveEvent(QEvent *event){if( isEnabled() )setIcon(m_NormalIcon);}//重载鼠标事件void CoolButton::mousePressEvent(QMouseEvent *event){if( isEnabled() && !m_PressedIcon.isNull() )setIcon(m_PressedIcon);QToolButton::mousePressEvent(event);}void CoolButton::mouseReleaseEvent(QMouseEvent *event){if( isEnabled() && m_FocusIcon.isNull() )setIcon(m_FocusIcon);QToolButton::mouseReleaseEvent(event);}void CoolButton::SetButtonIcons(const QIcon &normal, const QIcon &focus, const QIcon &pressed){m_NormalIcon = normal;m_FocusIcon = focus;m_PressedIcon = pressed;setIcon(m_NormalIcon);}#include "main.moc"int main(int argc, char **argv){QApplication app(argc, argv);CoolButton *button = new CoolButton;//QObject::connect(button, SIGNAL(clicked()), qApp, SLOT(quit()));button->setIconSize(QSize(40, 40));button->SetButtonIcons(QIcon("normal.png"), QIcon("focus.png"), QIcon("pressed.png"));button->show();return app.exec();}