Load SwipeView pages dynamically - qt

Question

I have created the following MWE (Qt 5.13.0):
import QtQuick 2.0
import QtQuick.Window 2.2
import QtQuick.Controls 2.3
ApplicationWindow
{
property int itemsNo: 3;
id: window
visible: true
width: 480
height: 480
SwipeView
{
anchors.fill: parent;
id: theSwipeView;
Loader
{
sourceComponent: theSingleComp;
Component
{
id: theSingleComp;
Page
{
Text
{
text: "The single one";
}
}
}
}
Repeater
{
model: itemsNo;
Loader
{
sourceComponent: theMultiComp;
Component
{
id: theMultiComp;
Page
{
Text
{
text: "The multi one " +
(theSwipeView.currentIndex - 1);
}
}
}
}
}
}
}
In my program, I have an unique component (theSingleComp) and multiple components behind him (theMultiComp). As for now, I need to implement the following functionality:
In case the model used for theMultiComp has only 1 item, display only this item and not the theSingleComp. In case the are more theMultiComp items, display it like now. It seems to me that there is no possibility for this to work if I keep the items defined statically. But on the other hand, I don't know how to do this dynamically, since there is a case in which one of the components should not be displayed at all. I tried an approach like this:
sourceComponent: (itemsNo > 1) ? theSingleComp : null;
But then the page for this null component is still created.

Answer 1

Your problem is that Loader is an Item and SwipeView creates a page for it even if it doesn't have a source component.
To solve this problem you can use Repeater instead with a model of 1 (or 0 to disable it). Repeater is also an Item but it has some special code under the hood to be ignored by containers.
import QtQuick 2.0
import QtQuick.Window 2.2
import QtQuick.Controls 2.3
ApplicationWindow
{
id: window
property int itemsNo: 0
visible: true
width: 480
height: 480
SwipeView {
id: theSwipeView
anchors.fill: parent
Repeater {
model: window.itemsNo > 1 ? 1 : 0
Page {
Text {
text: "The single one"
}
}
}
Repeater {
model: window.itemsNo
Page {
Text {
text: "The multi one " + model.index
}
}
}
}
}
(I've simplified your code to remove the explicit Components and the Loaders)

Answer 2

I have come up with the following solution but I am not happy with it. It's very hacky and the user can see how the page index changes.
import QtQuick 2.0
import QtQuick.Window 2.2
import QtQuick.Controls 2.3
ApplicationWindow
{
property int itemsNo: 2;
id: window
visible: true
width: 480
height: 480
SwipeView
{
anchors.fill: parent;
id: theSwipeView;
Component.onCompleted:
{
if (itemsNo > 1)
insertItem(0, theSingleComp);
set0IndexTimer.start();
}
Timer
{
id: set0IndexTimer;
interval: 1;
running: false;
repeat: false;
onTriggered: theSwipeView.setCurrentIndex(0);
}
onCurrentIndexChanged: console.log("page: ", currentIndex);
Repeater
{
model: itemsNo;
Loader
{
sourceComponent: theMultiComp;
Component
{
id: theMultiComp;
Page
{
Text
{
text: "The multi one " + theSwipeView.currentIndex;
}
}
}
}
}
}
Item
{
id: theSingleComp;
Page
{
Text
{
text: "The single one";
}
}
}
}
I am still seeking some other examples.