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import QtQuick
import QtQuick.Controls
import qs.Widgets
import "ScrollConstants.js" as Scroll
Flickable {
id: flickable
property alias verticalScrollBar: vbar
property real mouseWheelSpeed: Scroll.mouseWheelSpeed
property real momentumVelocity: 0
property bool isMomentumActive: false
property real friction: Scroll.friction
property bool _scrollBarActive: false
flickDeceleration: Scroll.flickDeceleration
maximumFlickVelocity: Scroll.maximumFlickVelocity
boundsBehavior: Flickable.StopAtBounds
boundsMovement: Flickable.FollowBoundsBehavior
pressDelay: 0
flickableDirection: Flickable.VerticalFlick
WheelHandler {
id: wheelHandler
property real touchpadSpeed: Scroll.touchpadSpeed
property real momentumRetention: Scroll.momentumRetention
property real lastWheelTime: 0
property real momentum: 0
property var velocitySamples: []
property bool sessionUsedMouseWheel: false
function startMomentum() {
flickable.isMomentumActive = true;
momentumAnim.running = true;
}
acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
onWheel: event => {
vbar._scrollBarActive = true;
vbar.hideTimer.restart();
const currentTime = Date.now();
const timeDelta = currentTime - lastWheelTime;
lastWheelTime = currentTime;
const hasPixel = event.pixelDelta && event.pixelDelta.y !== 0;
const deltaY = event.angleDelta.y;
const isTraditionalMouse = !hasPixel && Math.abs(deltaY) >= 120 && (Math.abs(deltaY) % 120) === 0;
const isHighDpiMouse = !hasPixel && !isTraditionalMouse && deltaY !== 0;
const isTouchpad = hasPixel;
if (isTraditionalMouse) {
sessionUsedMouseWheel = true;
momentumAnim.running = false;
flickable.isMomentumActive = false;
velocitySamples = [];
momentum = 0;
flickable.momentumVelocity = 0;
const lines = Math.round(Math.abs(deltaY) / 120);
const scrollAmount = (deltaY > 0 ? -lines : lines) * flickable.mouseWheelSpeed;
let newY = flickable.contentY + scrollAmount;
newY = Math.max(0, Math.min(flickable.contentHeight - flickable.height, newY));
if (flickable.flicking) {
flickable.cancelFlick();
}
flickable.contentY = newY;
} else if (isHighDpiMouse) {
sessionUsedMouseWheel = true;
momentumAnim.running = false;
flickable.isMomentumActive = false;
velocitySamples = [];
momentum = 0;
flickable.momentumVelocity = 0;
let delta = deltaY / 8 * touchpadSpeed;
let newY = flickable.contentY - delta;
newY = Math.max(0, Math.min(flickable.contentHeight - flickable.height, newY));
if (flickable.flicking) {
flickable.cancelFlick();
}
flickable.contentY = newY;
} else if (isTouchpad) {
sessionUsedMouseWheel = false;
momentumAnim.running = false;
flickable.isMomentumActive = false;
let delta = event.pixelDelta.y * touchpadSpeed;
velocitySamples.push({
"delta": delta,
"time": currentTime
});
velocitySamples = velocitySamples.filter(s => currentTime - s.time < Scroll.velocitySampleWindowMs);
if (velocitySamples.length > 1) {
const totalDelta = velocitySamples.reduce((sum, s) => sum + s.delta, 0);
const timeSpan = currentTime - velocitySamples[0].time;
if (timeSpan > 0) {
flickable.momentumVelocity = Math.max(-Scroll.maxMomentumVelocity, Math.min(Scroll.maxMomentumVelocity, totalDelta / timeSpan * 1000));
}
}
if (timeDelta < Scroll.momentumTimeThreshold) {
momentum = momentum * momentumRetention + delta * Scroll.momentumDeltaFactor;
delta += momentum;
} else {
momentum = 0;
}
let newY = flickable.contentY - delta;
newY = Math.max(0, Math.min(flickable.contentHeight - flickable.height, newY));
if (flickable.flicking) {
flickable.cancelFlick();
}
flickable.contentY = newY;
}
event.accepted = true;
}
onActiveChanged: {
if (!active) {
if (!sessionUsedMouseWheel && Math.abs(flickable.momentumVelocity) >= Scroll.minMomentumVelocity) {
startMomentum();
} else {
velocitySamples = [];
flickable.momentumVelocity = 0;
}
}
}
}
onMovementStarted: {
vbar._scrollBarActive = true;
vbar.hideTimer.stop();
}
onMovementEnded: vbar.hideTimer.restart()
FrameAnimation {
id: momentumAnim
running: false
onTriggered: {
const dt = frameTime;
const newY = flickable.contentY - flickable.momentumVelocity * dt;
const maxY = Math.max(0, flickable.contentHeight - flickable.height);
if (newY < 0 || newY > maxY) {
flickable.contentY = newY < 0 ? 0 : maxY;
running = false;
flickable.isMomentumActive = false;
flickable.momentumVelocity = 0;
return;
}
flickable.contentY = newY;
flickable.momentumVelocity *= Math.pow(flickable.friction, dt / 0.016);
if (Math.abs(flickable.momentumVelocity) < Scroll.momentumStopThreshold) {
running = false;
flickable.isMomentumActive = false;
flickable.momentumVelocity = 0;
}
}
}
ScrollBar.vertical: DankScrollbar {
id: vbar
}
}
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