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QSignalMapper Class Reference

^{[ QtCore module]}

The QSignalMapper class bundles signals from identifiable senders. 更多...

继承 QObject .

方法

• __init__ ( self , QObject  parent  = None)
• map ( self )
• map ( self , QObject  sender )
• QObject mapping ( self , int  id )
• QObject mapping ( self , QString  text )
• QObject mapping ( self , QWidget  widget )
• QObject mapping ( self , QObject  object )
• removeMappings ( self , QObject  sender )
• setMapping ( self , QObject  sender , int  id )
• setMapping ( self , QObject  sender , QString  text )
• setMapping ( self , QObject  sender , QWidget  widget )
• setMapping ( self , QObject  sender , QObject  object )

Qt Signals

• void mapped (int)
• void mapped (const QString&)
• void mapped (QWidget*)
• void mapped (QObject*)

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详细描述

The QSignalMapper class bundles signals from identifiable senders.

This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal.

The class supports the mapping of particular strings or integers with particular objects using setMapping (). The objects' signals can then be connected to the map () slot which will emit the mapped () 信号采用 string or integer associated with the original signalling object. Mappings can be removed later using removeMappings ().

Example: Suppose we want to create a custom widget that contains a group of buttons (like a tool palette). One approach is to connect each button's clicked() signal to its own custom slot; but in this example we want to connect all the buttons to a single slot and parameterize the slot by the button that was clicked.

Here's the definition of a simple custom widget that has a single signal, clicked() , which is emitted with the text of the button that was clicked:

 class ButtonWidget : public QWidget
 {
     Q_OBJECT
 public:
     ButtonWidget(QStringList texts, QWidget *parent = 0);
 signals:
     void clicked(const QString &text);
 private:
     QSignalMapper *signalMapper;
 };
			

The only function that we need to implement is the 构造函数：

 ButtonWidget.ButtonWidget(QStringList texts, QWidget *parent)
     : QWidget(parent)
 {
     signalMapper = new QSignalMapper(this);
     QGridLayout *gridLayout = new QGridLayout;
     for (int i = 0; i < texts.size(); ++i) {
         QPushButton *button = new QPushButton(texts[i]);
         connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
         signalMapper->setMapping(button, texts[i]);
         gridLayout->addWidget(button, i / 3, i % 3);
     }
     connect(signalMapper, SIGNAL(mapped(const QString &)),
             this, SIGNAL(clicked(const QString &)));
     setLayout(gridLayout);
 }
			

A list of texts is passed to the constructor. A signal mapper is constructed and for each text in the list a QPushButton is created. We connect each button's clicked() signal to the signal mapper's map () slot, and create a mapping in the signal mapper from each button to the button's text. Finally we connect the signal mapper's mapped () signal to the custom widget's clicked() signal. When the user clicks a button, the custom widget will emit a single clicked() signal whose argument is the text of the button the user clicked.

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方法文档编制

QSignalMapper.__init__ ( self , QObject   parent  = None)

parent argument, if not None, causes self to be owned by Qt instead of PyQt.

构造 QSignalMapper with parent parent .

QSignalMapper.map ( self )

This method is also a Qt slot with the C++ signature void map() .

This slot emits signals based on which object sends signals to it.

QSignalMapper.map ( self , QObject   sender )

This method is also a Qt slot with the C++ signature void map(QObject*) .

This slot emits signals based on the sender 对象。

QObject QSignalMapper.mapping ( self , int  id )

Returns the sender QObject that is associated with the id .

另请参阅 setMapping ().

QObject QSignalMapper.mapping ( self , QString  text )

此函数重载 mapping ().

QObject QSignalMapper.mapping ( self , QWidget  widget )

此函数重载 mapping ().

Returns the sender QObject that is associated with the widget .

QObject QSignalMapper.mapping ( self , QObject   object )

此函数重载 mapping ().

Returns the sender QObject that is associated with the object .

QSignalMapper.removeMappings ( self , QObject   sender )

Removes all mappings for sender .

This is done automatically when mapped objects are destroyed.

QSignalMapper.setMapping ( self , QObject   sender , int  id )

Adds a mapping so that when map () is signalled from the given sender , the signal mapped( id ) is emitted.

There may be at most one integer ID for each sender.

另请参阅 mapping ().

QSignalMapper.setMapping ( self , QObject   sender , QString  text )

Adds a mapping so that when map () is signalled from the sender , the signal mapped( text ) is emitted.

There may be at most one text for each sender.

QSignalMapper.setMapping ( self , QObject   sender , QWidget  widget )

Adds a mapping so that when map () is signalled from the sender , the signal mapped( widget ) is emitted.

There may be at most one widget for each sender.

QSignalMapper.setMapping ( self , QObject   sender , QObject   object )

Adds a mapping so that when map () is signalled from the sender , the signal mapped( object ) is emitted.

There may be at most one object for each sender.

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Qt Signal Documentation

void mapped (int)

This is the default overload of this signal.

此信号被发射当 map () is signalled from an object that has an integer mapping set. The object's mapped integer is passed in i .

另请参阅 setMapping ().

void mapped (const QString&)

此信号被发射当 map () is signalled from an object that has a string mapping set. The object's mapped string is passed in text .

另请参阅 setMapping ().

void mapped (QWidget*)

此信号被发射当 map () is signalled from an object that has a widget mapping set. The object's mapped widget is passed in widget .

另请参阅 setMapping ().

void mapped (QObject*)

此信号被发射当 map () is signalled from an object that has an object mapping set. The object provided by the map is passed in object .

另请参阅 setMapping ().

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