Qt QML: in-file definition of reusable objects

Question

I have a Qml component that is reasonably large so that I want to make it a reusable component but it is too small/non-generic such that I want to avoid creating its own .qml file. It seems like Components are the right method to define reusable objects in the same file, but when I do that I don't know how to access and change properties of the contained objects.

More specifically, imagine having an in-file definition like this

Component {
id: myReusableComponent
// This cannot be set because component does not allow properties
// (Would work fine in a separate file myReusableComponent.qml)
// property alias string innerText: innerText.text
Rectangle {
    id: rect
    width: 200
    height: 200
    color: "red"
    Text {
        id: innerText
        text: "Want to set text later"
    }
}

How can I reuse this component later, while changing some properties of it? I know the following is not valid syntax, but I want to use it similarly to this:

Loader {
id: hello
sourceComponent: myReusableComponent
item.innerText: "Hello" }

Text { text: "Some other stuff in between" }

Loader {
id: world
sourceComponent: myReusableComponent
item.anchors.left: hello.right
item.rect.width: 100
item.rect.color: "blue"
item.innerText: "World" }

Loader {
id: excl
sourceComponent: myReusableComponent
item.rect.color: "green"
item.innerText: "!!!" }
etc...

Any ideas? Or is there a fundamentally different way of doing this?
What I essentially want is reusability of QML objects that are defined in place while still being able to change the properties of them.

This seems to be related but does not solve the problem of creating multiple objects. Repeaters seem to be useful but don't give me the flexibility I want.

---

NOTE: I will add some remarks about the answers here since they might get overlooked in the comments. I like all three answers from Blabbouze, derM and ddriver! I accepted Blabbouze's answer because it provides a concrete solution that is closest to what I was looking for. However, I also didn't know about the overhead of Loaders and might consider using a different approach after reading derM's answer. Finally, dynamic object creation as suggested by ddriver is not exactly what I was looking for but might be useful for others. Thanks everyone!

Answer 1

我认为您正在寻找onLoaded()信号。当Loader成功创建Component.

然后，您可以使用 访问加载的类型属性item。

import QtQuick 2.7
import QtQuick.Controls 2.0


ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")


    Component {
        id: myReusableComponent
        Rectangle {
            id: rect
            property alias innerText: innerText.text

            width: 200
            height: 200
            color: "red"
            Text {
                id: innerText
                text: "Want to set text later"
            }
        }
    }


    Loader {
        id: hello
        sourceComponent: myReusableComponent
        onLoaded: {
            item.innerText = "hello"
        }
    }

    Loader {
        id: world
        sourceComponent: myReusableComponent
        anchors.left: hello.right
        onLoaded: {
            item.width =  100
            item.color =  "blue"
            item.innerText =  "World"
        }
    }
}