Everyone knows about how to set a background for Buttons, Popups etc via the background property of these elements. But I am wondering, how can I create such a property myself for my own custom elements? I found a way but it looks pretty ugly and I can't seem to find the qml code for Button, Popup etc where said property is defined. So i played a bit and came up with the idea of using Bindings like this:
Item {
id: root
property Item background: Rectangle {
color: "red"
}
Binding {
target: root.background
property: "parent"
value: root
}
Binding {
target: root.background
property: "anchors.fill"
value: root
when: root.background.parent == root
delayed: true
}
}
As mentioned that looks pretty tiresome if you need to declare a lot of properties of the child. So, how does Qt do it or what is the proper way of doing it?
CodePudding user response:
// ItemWithBackground.qml
Item {
property alias background: backgroundLoader.sourceComponent
Loader {
id: backgroundLoader
anchors { fill: parent }
sourceComponent: Rectangle { color: 'red' } // default background implementation
}
}
// Usage example:
ItemWithBackground {
background: Rectangle {
color: 'green'
}
}