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我有一段代码调用mousePressEvent。我有左键单击输出光标的坐标,我有rightclick做同样的事情,但我也想要右键单击打开一个上下文菜单。我到目前为止的代码是:Qt中的rightclick事件来打开上下文菜单
void plotspace::mousePressEvent(QMouseEvent*event)
{
double trange = _timeonright - _timeonleft;
int twidth = width();
double tinterval = trange/twidth;
int xclicked = event->x();
_xvaluecoordinate = _timeonleft+tinterval*xclicked;
double fmax = Data.plane(X,0).max();
double fmin = Data.plane(X,0).min();
double fmargin = (fmax-fmin)/40;
int fheight = height();
double finterval = ((fmax-fmin)+4*fmargin)/fheight;
int yclicked = event->y();
_yvaluecoordinate = (fmax+fmargin)-finterval*yclicked;
cout<<"Time(s): "<<_xvaluecoordinate<<endl;
cout<<"Flux: "<<_yvaluecoordinate<<endl;
cout << "timeonleft= " << _timeonleft << "\n";
returncoordinates();
emit updateCoordinates();
if (event->button()==Qt::RightButton)
{
contextmenu->setContextMenuPolicy(Qt::CustomContextMenu);
connect(contextmenu, SIGNAL(customContextMenuRequested(const QPoint&)),
this, SLOT(ShowContextMenu(const QPoint&)));
void A::ShowContextMenu(const QPoint &pos)
{
QMenu *menu = new QMenu;
menu->addAction(tr("Remove Data Point"), this,
SLOT(test_slot()));
menu->exec(w->mapToGlobal(pos));
}
}
}
我知道我的问题在本质上是非常基本的,而“文本菜单”未正确申报。我将许多来源的代码拼凑在一起,并不知道如何在C++中声明某些内容。任何建议将不胜感激。