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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
import QtQuick 2.12
import TransitionItem 1.0
import QtQuick.Controls 2.3
import QtQuick.Timeline 1.0
Item {
id: root
property var transitionView
property var list
parent: transitionView
anchors.fill: parent
z: -1
property real threshold: 35
property bool horizontal: true
property Item __activeItem
property bool __reactToTransition: false
Timer {
id: blocker
running: false
interval: 200
repeat: false
onTriggered: handler.enabled = true
}
Connections {
target: transitionView
function onTransitionFinished() {
if (!root.__reactToTransition)
return
/* This is a tricky one. We have to also update the list.
The connection could be also done the other way around */
list.currentItem = root.__activeItem
root.__reactToTransition = false
}
}
DragHandler {
id: handler
xAxis.enabled: root.horizontal
yAxis.enabled: !root.horizontal
target: null
enabled: true
function distance() {
if (root.horizontal)
return (centroid.position.x - centroid.pressPosition.x) / transitionView.width
return -(centroid.position.y - centroid.pressPosition.y) / transitionView.height
}
onActiveChanged: {
if (handler.active) {
if (distance() < 0)
transitionView.nextItem = list.nextItem
else
transitionView.nextItem = list.prevItem
transitionView.scheduleTransition()
if (transitionView.currentTransition)
transitionView.currentTransition.effect.enable()
} else {
var p = Math.abs(distance()) * 100
if (transitionView.currentTransition && transitionView.currentTransition.effect.progress > root.threshold) {
root.__activeItem = transitionView.nextItem
root.__reactToTransition = true
transitionView.currentTransition.__start()
} else { /* Drag was released, but threshold was not passed */
if (transitionView.currentTransition)
transitionView.currentTransition.effect.abort()
}
/* Block for 100ms */
handler.enabled = false
blocker.start()
}
}
onCentroidChanged: {
if (!handler.enabled)
return
var p = Math.abs(distance()) * 100
if (transitionView.currentTransition)
transitionView.currentTransition.effect.progress = p * 2
}
}
}
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