}classWidget :publicQWidget { Q_OBJECTpublic:explicitWidget(QWidget *parent =0);~Widget();privateslots:voidon_pushButton_clicked();voidnewConnection();voidreadMessage();voidsendMessage();voiddisplayError(QAbstractSocket::SocketError); private: Ui::Widget*ui; QTcpSocket*tcpSocket; QString message...
我们强烈建议在QObject的所有子类中使用此宏,无论它们是否实际使用信号,插槽和属性,因为如果不这样做可能会导致某些函数表现出奇怪的行为。 所有Qt小部件都继承QObject。便利函数isWidgetType()返回一个对象实际上是一个小部件。它比qobject_cast < QWidget *>(obj)或obj - > inherits(“ QWidget”)快得多。
If you still want to make it work with signals you can remove theQ_OBJECTmacro and use theQObject::connect() for example: #include<QApplication>#include<QWidget>#include<iostream>classWidget:publicQWidget {//Q_OBJECTpublic:Widget(QWidget *parent =0); ~Widget(); }; Widget::Widget(QWid...
All Qt widgets inherit QObject. The convenience function isWidgetType() returns whether an object is actually a widget. It is much faster than inherits( "QWidget" ). Some QObject functions, e.g. children(), objectTrees() and queryList() return a QObjectList. A QObjectList is a QPtrL...
Header: #include <QWidget> CMake: find_package(Qt6 REQUIRED COMPONENTS Widgets) target_link_libraries(mytarget PRIVATE Qt6::Widgets) qmake: QT += widgets Inherits: QObject and QPaintDevice Inherited By: QAbstractButton, QAbstractSlider, QAbstractSpinBox, QCalendarWidget, QComboBox, QDesigner...
}classDialog:publicQDialog { Q_OBJECTpublic:Dialog(QWidget *parent =0); ~Dialog();private: Ui::Dialog *ui; };#endif// DIALOG_H dialog.cpp #include"dialog.h"#include"ui_dialog.h"Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(newUi::Dialog) ...
Qt 里经常见 #include 和 class QXXX。前者是包含头文件,头文件中一般来说包含了 QXXX 类的定义,编译代码时预处理器要做 include 头文件的...
bool QObject::isWidgetType () constReturns true if the object is a widget; otherwise returns false.Calling this function is equivalent to calling inherits("QWidget"), except that it is much faster.void QObject::killTimer ( int id )
The QWidgetFactory class provides for the dynamic creation of widgets from Qt Designer .ui files. More... #include <qwidgetfactory.h> Li…
The reason for having a QWidget here is, that there is an option to use a canvas that is derived from a QGLWidget. But as long as you don't assign it from your application your dynamic_cast ( or qobject_cast ) will always succeed. Share Improve this answer Follow answered Oct 4,...