Connections QML Element

A Connections element describes generalized connections to signals. 更多...

Since:

Qt 4.7

所有成員列錶，包括繼承成員

特性

ignoreUnknownSignals : bool
target : Object

詳細描述

Connections 對象創建到 QML 信號的連接。

When connecting to signals in QML, the usual way is to create an "on<Signal>" handler that reacts when a signal is received, like this:

MouseArea {
    onClicked: { foo(parameters) }
}

However, it is not possible to connect to a signal in this way in some cases, such as when:

Multiple connections to the same signal are required
Creating connections outside the scope of the signal sender
Connecting to targets not defined in QML

When any of these are needed, the Connections element can be used instead.

For example, the above code can be changed to use a Connections object, like this:

MouseArea {
    Connections {
        onClicked: foo(parameters)
    }
}

More generally, the Connections object can be a child of some object other than the sender of the signal:

MouseArea {
    id: area
}
// ...

Connections {
    target: area
    onClicked: foo(parameters)
}

另請參閱 QtDeclarative .

特性文檔編製

ignoreUnknownSignals : bool

Normally, a connection to a non-existent signal produces runtime errors.

若把此特性設為 true , such errors are ignored. This is useful if you intend to connect to different types of objects, handling a different set of signals for each object.

target : 對象

此特性保持發送信號的對象。

若此特性未設置， target 默認為連接的父級。

If set to null, no connection is made and any signal handlers are ignored until the target is not null.