通过QLabel创建类似冒泡方式的提示框(提示框显示位置为父类控件居中位置，具体可根据需要自行修改)，鼠标停留提示框界面时查看信息，离开时自动淡化消失的效果；
头文件定义
#ifndef _TTipWidget_H_
#define _TTipWidget_H_ class TTipWidget :public QLabel
{
Q_OBJECT public:
static TTipWidget &Instance();
void SetMesseage(const QString &strMessage, const QPoint *pPoint=nullptr); private:
TTipWidget();
~TTipWidget(); void OnTimer();
void enterEvent(QEvent *);
void leaveEvent(QEvent *); private:
QWidget *mpParent;
QTimer *mpTimer;
bool mbEnter;
int mnTransparent;
}; #endif // _TTipWidget_H_
实例实现
#include "TTipWidget.h" TTipWidget::TTipWidget()
: mpParent(nullptr)
, mbEnter(false)
, mnTransparent()
{
setWindowFlags(Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
setAlignment(Qt::AlignCenter); mpTimer = new QTimer(this);
connect(mpTimer, &QTimer::timeout, this, &TTipWidget::OnTimer);
} TTipWidget::~TTipWidget()
{
deleteLater();
} void TTipWidget::enterEvent(QEvent *)
{
mbEnter = true;
mnTransparent = ;
setStyleSheet(QString("color:white;font:12px \"Microsoft YaHei\";border-radius:5px;background-color:rgba(80, 80, 80, %1);").arg(mnTransparent));
} void TTipWidget::leaveEvent(QEvent *)
{
mbEnter = false;
} void TTipWidget::OnTimer()
{
if (mbEnter)
{
return;
} mnTransparent -= ;
if (mnTransparent > )
{
if (mpParent && parentWidget())
{
QPoint pt((parentWidget()->width() - width()) >> , (parentWidget()->height() - height()) >> );
if (pos() != pt)
{
move(pt);
}
}
setStyleSheet(QString("color:white;font:12px \"Microsoft YaHei\";border-radius:5px;background-color:rgba(80, 80, 80, %1);").arg(mnTransparent));
}
else
{
mpTimer->stop();
setVisible(false);
}
} void TTipWidget::SetMesseage(const QString &strMessage, const QPoint *pPoint)
{
if (strMessage.isEmpty())
{
return;
} QFontMetrics fm1(font());
setFixedSize(fm1.width(strMessage) + , ); mpParent = parentWidget(); if (width() > mpParent->width())
{
setFixedSize(mpParent->width() - , );
setWordWrap(true);
}
else
{
setWordWrap(false);
} setText(strMessage); if (nullptr != mpParent)
{
if (nullptr != pPoint)
{
move(mpParent->mapFromGlobal(*pPoint));
mpParent = nullptr;
}
else
{
move((mpParent->width() - width()) >> , (mpParent->height() - height()) >> );
}
} setVisible(true);
mnTransparent = ; mpTimer->start();
} TTipWidget &TTipWidget::Instance()
{
static TTipWidget tipWidget;
return tipWidget;
}
外部引用
TTipWidget::Instance().setParent(this); //设置实例的引用者
TTipWidget::Instance().setVisible(false); TTipWidget::Instance().SetMesseage(tr("Disappearing tips!")); //提示信息