Connections QML 类型

描述信号的一般化连接。更多...

import 语句：

import QtQml 2.2

所有成员列表，包括继承成员

特性

enabled : bool
ignoreUnknownSignals : bool
target : Object

详细描述

Connections 对象创建到 QML 信号的连接。

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: (mouse)=> { foo(mouse) }
}

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 type can be used instead.

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

MouseArea {
    Connections {
        function onClicked(mouse) { foo(mouse) }
    }
}

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
    function onClicked(mouse) { foo(mouse) }
}

另请参阅 Qt QML .

特性文档编制

[since 5.7] enabled : bool

此特性保持项是否接受改变事件。

默认情况下，此特性为 true .

该特性在 Qt 5.7 引入。

ignoreUnknownSignals : bool

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

If this property is set to 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 : 对象

此特性保持发送信号的对象。

如果未设置此特性， target 默认为连接的父级。

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