[英]How to add a slot to a QWidget?
我有一个的QMainWindow,其具有QAction
其信号triggered()
被连接到狭槽about2()
。
...
connect(mAboutAction2, SIGNAL(triggered()), this, SLOT(about2()));
...
void occQt::about2() //UI
{
QWidget* pWidget = new QWidget;
QPushButton* okbtn = new QPushButton(tr("ok"));
QPushButton* cancelbtn = new QPushButton(tr("cancel"));
btnlayout->addWidget(okbtn);
btnlayout->addWidget(cancelbtn);
dlglayout->setMargin(50);
dlglayout->addLayout(gridlayout);
dlglayout->addStretch(40);
dlglayout->addLayout(btnlayout);
pWidget->setLayout(dlglayout);
pWidget->setWindowTitle(tr("Make a Box by custom."));
pWidget->show();
connect(okbtn, SIGNAL(clicked()), pWidget, SLOT(make_a_box()));
connect(cancelbtn, SIGNAL(clicked()), pWidget, SLOT(close()));
}
void occQt::make_a_box()
{
TopoDS_Shape aTopoBox = BRepPrimAPI_MakeBox(3.0, 4.0, 95.0).Shape();
Handle_AIS_Shape anAisBox = new AIS_Shape(aTopoBox);
anAisBox->SetColor(Quantity_NOC_AZURE);
mContext->Display(anAisBox);
}
当我运行插槽about2()
,UI将打开。 单击cancelbtn
时可以将其关闭,但无法输入插槽make_a_box()
。
在哪里可以添加此插槽以使此代码正常工作?
没关系,可以正常运行,因为您使用的插槽位于occQt
类中的正确位置:。
// You connect the signal FROM the action TO "this", i.e. your class
connect(mAboutAction2, SIGNAL(triggered()), this, SLOT(about2()));
void occQt::about2() //UI
{
QWidget* pWidget = new QWidget;
QPushButton* okbtn = new QPushButton(tr("ok"));
QPushButton* cancelbtn = new QPushButton(tr("cancel"));
btnlayout->addWidget(okbtn);
btnlayout->addWidget(cancelbtn);
dlglayout->setMargin(50);
dlglayout->addLayout(gridlayout);
dlglayout->addStretch(40);
dlglayout->addLayout(btnlayout);
pWidget->setLayout(dlglayout);
pWidget->setWindowTitle(tr("Make a Box by custom."));
pWidget->show();
现在,这不行:
// You connect the signal FROM the button to pWidget, which doesn't have a slot make_a_box()
connect(okbtn, SIGNAL(clicked()), pWidget, SLOT(make_a_box()));
槽make_a_box()
不存在pWidget
,这是一个QWidget
。 您正在尝试将信号连接到不存在的插槽。
您必须在occQt
类中定义此插槽, 然后将按钮的信号clicked()
连接到类中的插槽 :
// Now, you connect the signal FROM the button to "this", which is your class and has a slot make_a_box()
connect(okbtn, SIGNAL(clicked()), this, SLOT(make_a_box()));
在您的.h文件中,您将具有:
private slots :
void make_a_box();
在您的.cpp文件中:
void occQt::make_a_box()
{
TopoDS_Shape aTopoBox = BRepPrimAPI_MakeBox(3.0, 4.0, 95.0).Shape();
Handle_AIS_Shape anAisBox = new AIS_Shape(aTopoBox);
anAisBox->SetColor(Quantity_NOC_AZURE);
mContext->Display(anAisBox);
}
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