blocks|key|1070463|text|我认为这可能是有用的一节“信号连接”，你可以找到这里。基本上，每个信号都有一个connect方法，可以利用该方法创建一个信号链。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1070464|如果您对前键事件感兴趣(如您的示例中所示)，请考虑使用forwardTo属性：|1070465|此属性提供了一种向前键按下、键释放和键盘输入的方式，这些输入来自于输入方法到其他项。当您希望一个项处理一些键(例如向上和向下箭头键)，另一个项处理其他键(例如左键和右箭头键)时，这可能很有用。一旦已转发的项接受该事件，则不再将其转发到列表后面的项。|blockquote|BOLD|1070466|文档提供了一个很好的简单示例。|1070467|entityMap|0|LINK|mutability|MUTABLE|url|http://qt-project.org/doc/qt-5/qtqml-syntax-signals.html#signal-to-signal-connect^0|13|7|O|2|0|0|R|9|0|8|5|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@$9|15|A|16|B|K]]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

I think it could be useful the section "Signal to Signal Connect" that you can find <a href="http://qt-project.org/doc/qt-5/qtqml-syntax-signals.html#signal-to-signal-connect" rel="nofollow">here</a>.
Basically, each signal has a <code>connect</code> method which can be exploited to create a signals chain.

If you are interested to forword key events (as in your example) consider instead the <code>forwardTo</code> property:

<blockquote>
 This property provides a way to forward key presses, key releases, and keyboard input coming from input methods to other items. This can be useful when you want one item to handle some keys (e.g. the up and down arrow keys), and another item to handle other keys (e.g. the left and right arrow keys). Once an item that has been forwarded keys accepts the event it is no longer forwarded to items later in the list.
</blockquote>

The documentation provides a nice and simple example.

blocks|key|1221293|text|在项目之间移动事件的一种方法是创建一个C%2B%2B插件并使用QCoreApplication::sendEvent。不幸的是，Qt并不直接从QML+KeyEvent和C%2B%2B+QKeyEvent映射，因此插件的接口需要公开事件的内部：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1221294|bool+EventRelay::relayKeyPressEvent(
+++int+key,
+++Qt::KeyboardModifiers+modifiers,
+++const+QString&+text,
+++bool+autoRepeat,
+++ushort+count)+const
{
+++QKeyEvent+event(QKeyEvent::KeyPress,+key,+modifiers,+text,+autoRepeat,+count);
+++return+relayEventToObject(&event,+mpTargetObject);
}|code-block|syntax|javascript|1221295|使用它：|1221296|EventRelay+{+id:+relay+}

Item+{
+++id:+item1
+++Keys.onPressed:+{
++++++//+Pre-process...

++++++relay.relayEventToObject(event,+item2);

++++++//+Post-process...
+++}
}

TextInput+{
+++id:+item2
}|1221297|entityMap|0|LINK|mutability|MUTABLE|url|http://qt-project.org/doc/qt-5/qcoreapplication.html#sendEvent^0|R|R|1Z|8|2C|9|R|R|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

One method to move events between Items is to create a C++ plugin and use <a href="http://qt-project.org/doc/qt-5/qcoreapplication.html#sendEvent" rel="nofollow"><code>QCoreApplication::sendEvent</code></a>. Unfortunately, Qt doesn't map directly from the QML <code>KeyEvent</code> and the C++ <code>QKeyEvent</code>, so the interface to the plugin will need to expose the internals of the event:

<pre><code>bool EventRelay::relayKeyPressEvent(
 int key,
 Qt::KeyboardModifiers modifiers,
 const QString&amp; text,
 bool autoRepeat,
 ushort count) const
{
 QKeyEvent event(QKeyEvent::KeyPress, key, modifiers, text, autoRepeat, count);
 return relayEventToObject(&amp;event, mpTargetObject);
}
</code></pre>

To use it:

<pre><code>EventRelay { id: relay }

Item {
 id: item1
 Keys.onPressed: {
 // Pre-process...

 relay.relayEventToObject(event, item2);

 // Post-process...
 }
}

TextInput {
 id: item2
}
</code></pre>

blocks|key|1070473|text|您只需在第一个对象信号处理程序中调用另一个对象的信号：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1070474|Item+{
+++id:+item1
+++Keys.onPressed:+{
++++++//+Pre-process...
++++++item2.Keys.pressed(event);
++++++//+Post-process+based+on+results+of+event+passing...
+++}
}

Item+{
+++id:+item2
+++Keys.onPressed:+{
++++++//+Some+other+stuff+happens+here
+++}
}|code-block|syntax|javascript|1070475|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can simply invoke the other object's signal in your first object signal handler :

<pre><code>Item {
 id: item1
 Keys.onPressed: {
 // Pre-process...
 item2.Keys.pressed(event);
 // Post-process based on results of event passing...
 }
}

Item {
 id: item2
 Keys.onPressed: {
 // Some other stuff happens here
 }
}
</code></pre>

I have a situation where I would like to pass a QML event to another QML item in the middle of the initial event handler. e.g.

<pre><code>Item {
 id: item1

 Keys.onPressed: {
 // Pre-process...

 passEventToObject(event, item2);

 // Post-process based on results of event passing...
 }
}

TextInput {
 id: item2
 // Expect key press event to be handled by text input
}
</code></pre>

What can I do to acheive <code>passEventToObject</code>?

Notes:

<ul>
<li>I don't have access to modify <code>Keys.onPressed</code> inside <code>item2</code>, it's a QML built-in (<code>TextInput</code>).</li>
<li>The event passing must happen in the middle of <code>item1.Keys.onPressed</code></li>
</ul>

Pass Events Between QML Objects

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在这种情况下，我希望将一个QML事件传递给初始事件处理程序中间的另一个QML项。例如：Item {   id: item1   Keys.onPressed: {      // Pre-process...      passEventToObject(event, item2);      // Post-proc...

问在QML对象之间传递事件
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