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