Connections QML 类型

描述信号的一般化连接。 更多...

导入语句：

import QtQml

• 所有成员列表，包括继承成员

特性

• enabled : bool
• ignoreUnknownSignals : bool
• target : QtObject

详细描述

A Connections object creates a connection to a QML signal.

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) }
}
					

注意： For backwards compatibility you can also specify the signal handlers without function , like you would specify them directly in the target object. This is not recommended. If you specify one signal handler this way, then all signal handlers specified as function in the same Connections object are ignored.

另请参阅 Qt QML .

特性文档编制

enabled : bool

This property holds whether the item accepts change events.

默认情况下，此特性为 true .

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 : QtObject

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.

内容

• 特性

• 详细描述