【Qt入門之Button】Button中添加longpress事件

Qt中默認的qpushbutton沒有longpress事件，當需要相應btn的longpress事件的時候，就需要重載一下qpushbutton的press和release事件。

DycPushButton.h

<pre name="code" class="cpp">#ifndef DYCPUSHBUTTON_H
#define DYCPUSHBUTTON_H
#include "qpushbutton.h"
#include <QTimer>
#define TIMERSTART true;
#define TIMESTOP false;
class DycPushButton:QPushButton
{
public:
    DycPushButton();
private:
    QTimer               m_pcPressTimer;
    int                        m_nPressTime;
    bool                    m_bTimerStart;
public :
    void setLongPressTime(int PressTime);
public:
    bool mousePressEvent(QMouseEvent *event);
    bool mouseReleaseEvent(QMouseEvent *event);
    bool mouseDoubleClickEvent(QMouseEvent *event);
    bool mouseMoveEvent(QMoveEvent *event);
signals:
    onBtnLongPressed();
private slots:
    onTimeOut();
};

#endif // DYCPUSHBUTTON_H

<span style="font-family: Arial, Helvetica, sans-serif;">DycPushButton.cpp</span>

</pre><pre name="code" class="cpp">#include "DycPushButton.h"

DycPushButton::DycPushButton()
{
    m_pcPressTimer  = new QTimer(this);
    m_bTimerStart = TIMESTOP;
    connect(m_pcPressTimer,SIGNAL(timeout()),this,(onTimeOut()));
}

//設置longpress時間
void DycPushButton::setLongPressTime(int PressTime)
{
        if(PressTime)
        {
                m_nPressTime = PressTime;
        }
}
//btn press時開始計時
bool DycPushButton::mousePressEvent(QMouseEvent *event)
{
    if(m_nPressTime)
    {
        m_bTimerStart = TIMERSTART;
        m_pcPressTimer.start(m_nPressTime);
    }
    return mousePressEvent(event);
}

//btn release時停止計時

bool DycPushButton::mouseReleaseEvent(QMouseEvent *event)
{
    if(m_bTimerStart)
    {
        m_pcPressTimer.stop();

<pre style="margin-top: 0px; margin-bottom: 0px;"><pre name="code" class="cpp">        m_bTimerStart = TIMESTOP;
    }
    return mouseReleaseEvent(event);
}
bool DycPushButton::mouseDoubleClickEvent(QMouseEvent *event)
{
    return mouseDoubleClickEvent(event);
}
bool DycPushButton::mouseMoveEvent(QMoveEvent *event)
{
    return mouseMoveEvent(event);
}
//SLOT function is belown
void DycPushButton::onTimeOut()
{
    emit onBtnLongPressed();
    m_bTimerStart = TIMESTOP;
}