feat: QtConnect

QtConnect/QtConnect.pro

@@ -0,0 +1,21 @@
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# You can make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    widget.cpp
+
+HEADERS += \
+    widget.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

QtConnect/main.cpp

@@ -0,0 +1,11 @@
+#include "widget.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Widget w;
+    w.show();
+    return a.exec();
+}

QtConnect/widget.cpp

@@ -0,0 +1,43 @@
+#include "widget.h"
+#include <QMetaMethod>
+#include <QPushButton>
+
+
+////Qt4: 宏
+///*式1*/  static QMetaObject::Connection connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type = Qt::AutoConnection)
+///*式2*/         QMetaObject::Connection connect(const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type = Qt::AutoConnection) const
+//// Qt5: 函数指针
+///*式3*/  static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type = Qt::AutoConnection)
+///*式4*/  static QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, Functor functor)
+///*式5*/  static QMetaObject :: Connection QObject :: connect(const QObject * sender， const QMetaMethod＆signal，const QObject * receiver， const QMetaMethod＆ method，Qt :: ConnectionType type = Qt :: AutoConnection）
+
+
+Widget::Widget(QWidget *parent)
+    : QWidget(parent)
+{
+    setWindowTitle(tr("信号和槽：Qt4 与 Qt5 的 Connect 用法"));
+    QPushButton *btn = new QPushButton(tr("关闭"), this);
+    btn->move(width() / 2, height() / 2);
+    setFixedSize(800, 600);
+
+    // Qt4: 宏
+//    connect(btn, SIGNAL(clicked()), this, SLOT(close()));  // 式 1
+//    connect(btn, SIGNAL(clicked()), SLOT(close()));  // 式 2
+
+
+    // Qt5: 函数指针
+//    connect(btn, &QPushButton::clicked, this, &Widget::close);  // 式 3
+
+//    connect(btn, &QPushButton::clicked, [=](){  // 式 4
+//        close();
+//    });
+
+    int indexSig = btn->metaObject()->indexOfSignal("clicked(bool)");
+    int indexSlot = metaObject()->indexOfSlot("close()");
+    connect(btn, btn->metaObject()->method(indexSig), this, metaObject()->method(indexSlot)); // 式 5
+}
+
+Widget::~Widget()
+{
+}
+

QtConnect/widget.h

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+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+};
+#endif // WIDGET_H