StackLayout in QML - qt

Question

Requirement: I am building a Settings app in QML, in which the I have divided screen into a grid. On the left hand side of the Grid, there are buttons : Home, Connectivity, Settings and Quit. and on the right hand side, corresponding display should be drawn. Currently, I have added a rectangle, and when I click on buttons like Home, Settings, connectivity etc.. . Code written inside the rectangle of StackLayout is executed successfully.
Instead of writing code in a rectangle, i want to write code in a separate file like settings.qml, connectivity.qml.
How to call the different file by clicking on buttons and setting current Index
import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 1.2
import QtQuick.Layouts 1.3
ApplicationWindow {
id:main1
visible: true
x:0
y:20
width: Screen.width
height: Screen.height
title: qsTr("Settings")
GridLayout {
id: gridLayout
width: parent.width
height:main1.height
columns: 2
Rectangle {
id: left_rect
width: Screen.width/4
height: gridLayout.height
color:"yellow"
Button {
id: button
text: qsTr("Home")
anchors.right: parent.right
anchors.rightMargin: 5
anchors.left: parent.left
anchors.leftMargin: 5
anchors.top: parent.top
anchors.topMargin: 5
onClicked: {
layout.currentIndex = 0
}
}
Button {
id: button1
x: 1
y: -4
text: qsTr("Connectivity")
anchors.topMargin: 59
anchors.leftMargin: 5
anchors.left: parent.left
anchors.top: parent.top
anchors.rightMargin: 5
anchors.right: parent.right
onClicked: {
layout.currentIndex = 1
}
}
Button {
id: button2
x: 5
y: -8
text: qsTr("Settings")
anchors.topMargin: 112
anchors.leftMargin: 5
anchors.left: parent.left
anchors.top: parent.top
anchors.rightMargin: 5
anchors.right: parent.right
onClicked: {
layout.currentIndex = 2
}
}
Button {
id: button3
x: 6
y: -16
text: qsTr("Quit")
anchors.topMargin: 172
anchors.leftMargin: 5
anchors.left: parent.left
anchors.top: parent.top
anchors.rightMargin: 5
anchors.right: parent.right
onClicked: {
Qt.quit()
}
}
}
Rectangle {
id: right_rect
width: ( Screen.width/4 )*3
height: Screen.height
color:"green"
StackLayout {
id: layout
anchors.fill: parent
currentIndex: 0
Rectangle {
color: 'teal'
implicitWidth: 200
implicitHeight: 200
}
Rectangle {
color: 'plum'
implicitWidth: 300
implicitHeight: 200
}
Rectangle {
color: 'orange'
implicitWidth: 300
implicitHeight: 200
}
}
}
}

Answer 1

Where you currently have
Rectangle {
color: 'teal'
implicitWidth: 200
implicitHeight: 200
}
replace with
qmlClassName {
id: someId
}