How to setup my button component to open a window - qt

Question

Here is the code of the window I wanna be opened in file PopUpFreeCoins.qml:
import QtQuick 2.0
import QtQuick.Controls 2.1
Item {
property int t
property int c
ListModel{
id:ff
ListElement {
name: "ByFollow"
s: "Images/follow.png"
}
ListElement {
name: "ByLike"
s: "Images/care.png"
}
ListElement {
name: "ByComment"
s: "Images/chat.png"
}
}
ListView{
width:t-t/10
height: c/5
layoutDirection:Qt.LeftToRight
orientation: ListView.Horizontal
model: ff
spacing:50
delegate: Button{
contentItem: Image{
source: s
}}
}
}
property t is set equal to window width in main file and property c is set to window height. This is code of my Button.qml:
Button{//Below Right
width:profilePicture.width/2
height:profilePicture.width/2
x:profilePicture.x+profilePicture.width
y:profilePicture.y+profilePicture.height
contentItem: Image {
source: "Images/freecoins.png"
anchors.fill: parent
}
onClicked: PopUp{height:100;width:300;PopUpFreeCoins{t:a;c:b;}}
}
property a is window width and b is window height.
this line onClicked: PopUp{height:100;width:300;PopUpFreeCoins{t:a;c:b;}} has an error I don't know how to handle!
Here is the error:
Cannot assign object type PopUpFreeCoins_QMLTYPE_0 with no default
method

Answer 1

You need to create the Object somehow. You have multiple ways for dynamically create Objects. One way is to use Component.createObject(parent) which requires you to have a Component instantiated in your file.
Here you can also pass a Object ({property0 : value, property1:value ... }) as second argument, to set the properties of the Component to be instantiated. You should not set the parent to null as it might happen, that the JS-garbage collector is too aggressive once again.
Alternatively you can use the Loader to load it from either a source (QML-file) or sourceComponent. Here you won't have problems with the garbage collector.
import QtQuick 2.7
import QtQuick.Controls 2.0
ApplicationWindow {
width: 1024
height: 800
visible: true
Button {
text: 'create'
onClicked: test.createObject(this)
}
Button {
x: 200
text: 'load'
onClicked: loader.active = !loader.active
}
Loader {
id: loader
source: 'TestObj.qml'
active: false
}
Component {
id: test
TestObj {}
}
}
TestObj.qml includes the Window to be opened.
Alternatively you can have the Window created from the beginning, and just change the visible to true or false.