Qt - change property from a component in a different qml file - qt

Question

Update 1
The idea is to be able to change the front and back of CardForm from main.qml because i want to be able to use multiple CardForm instances. I tried to do what they did here but it doesnt work.
Here is the code:
CardForm.qml
import QtQuick 2.0
Flipable {
id: sCard
width: 75
height: 200
property bool flipped: false
property string front: "Front"
property string back: "Back"
property alias callFront : front
property alias callBack : back
front: Rectangle{
id: front
anchors.fill: sCard
border.width: 2
border.color: "black"
radius: 5
Text{
anchors.centerIn: parent
text: sCard.front
}
}
back: Column{
Rectangle{
id: back
anchors.fill: sCard
radius: 5
border.width: 2
border.color: "black"
Text{
anchors.centerIn: parent
text: sCard.front
}
Text{
anchors.centerIn: parent
text: sCard.front
}
}
}
transform: Rotation{
id: flip
origin.x: sCard.width
origin.y: sCard.height/2
axis.x: 0; axis.y: 1; axis.z: 0 // set axis.y to 1 to rotate around y-axis
angle: 0 // the default angle
}
states: State {
name: "back"
PropertyChanges {
target: flip
angle: 180
}
when: sCard.flipped
}
transitions: Transition{
NumberAnimation {
target: flip
property: "angle"
duration: 200
}
}
MouseArea{
anchors.fill: parent
onClicked: sCard.flipped = !sCard.flipped
}
}
main.qml
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Neuro Seed")
SwipeView {
id: swipeView
anchors.fill: parent
currentIndex: tabBar.currentIndex
Column {
CardForm{
id: test
anchors.centerIn: parent
test.callFront: "Hello World!"
test.callBack: "Bonjour le Monde!
}
}
}
}
Here are the error messages:
SHGetSpecialFolderPath() failed for standard location "Shared Configuration", clsid=0x1c. ()
qrc:/main.qml:17:13: QML CardForm: back is a write-once property
qrc:/main.qml:17:13: QML CardForm: front is a write-once property
qrc:/main.qml:16:9: QML Column: Cannot specify top, bottom, verticalCenter, fill or centerIn anchors for items inside Column. Column will not function.
the c1.getFront() and getBack() were from a C++ class that I made. I changed these to "Hello World!" and "Bonjour le Monde!"

Answer 1

So after many hours of struggling I figured out that to create a property which is accessible by other .qml files you must create a property alias name: id.property. The id must point towards an existing instance of a object in your code and the property of this instance that you wish to be able to change from the outside. So in my case it would be like so:
CardForm.qml
Flipable {
id: sCard
width: 75
height: 200
property bool flipped: false
property alias frontText : front.text
front: Rectangle{
id: front
anchors.fill: sCard
border.width: 2
border.color: "black"
radius: 5
Text{
anchors.centerIn: parent
text: frontText
}
}
}
and in the main.qml
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Neuro Seed")
Rectangle {
anchors.fill: parent
CardForm{
id: test
anchors.centerIn: parent
frontText: "Hello World!"
}
}
}
}