95 lines
2.8 KiB
QML
95 lines
2.8 KiB
QML
// SPDX-License-Identifier: LGPL-3.0-or-later
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import QtQuick 2.12
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MouseArea {
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id: mouseArea
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property Flickable flickable: parent
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function getNewPosition(flickable, wheel) {
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// wheel.pixelDelta will be available on high resolution trackpads.
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// Otherwise use wheel.angleDelta, which is available from mouses and
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// low resolution trackpads.
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// When higher pixelDelta, more scroll will be applied
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const pixelDelta = {
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x: wheel.pixelDelta.x ||
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wheel.angleDelta.x / 8 * Qt.styleHints.wheelScrollLines,
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y: wheel.pixelDelta.y ||
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wheel.angleDelta.y / 8 * Qt.styleHints.wheelScrollLines,
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}
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// Return current position if there was not any movement
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if (
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flickable.contentHeight < flickable.height ||
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(! pixelDelta.x && ! pixelDelta.y)
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)
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return {x: flickable.contentX, y: flickable.contentY}
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// Rotate the direction if shift is pressed
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if (wheel.modifiers === Qt.ShiftModifier)
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[pixelDelta.x, pixelDelta.y] = [pixelDelta.y, pixelDelta.x]
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const maxScroll = {
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x: flickable.contentWidth +
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flickable.originX - // Why subtract?
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flickable.rightMargin -
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flickable.width,
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y: flickable.contentHeight +
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flickable.originY +
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flickable.bottomMargin -
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flickable.height,
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}
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const minScroll = {
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x: flickable.originX - flickable.leftMargin,
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y: flickable.originY - flickable.topMargin,
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}
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// Avoid overscrolling
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return {
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x: Math.max(
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minScroll.x,
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Math.min(maxScroll.x, flickable.contentX - pixelDelta.x)
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),
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y: Math.max(
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minScroll.y,
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Math.min(maxScroll.y, flickable.contentY - pixelDelta.y)
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),
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}
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}
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enabled: ! window.settings.enableKineticScrolling
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propagateComposedEvents: true
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acceptedButtons: Qt.NoButton
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onWheel: {
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// Make components below the stack notice the wheel event
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wheel.accepted = false
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if (wheel.modifiers === Qt.ControlModifier)
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return
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const pos = getNewPosition(flickable, wheel)
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flickable.flick(0, 0)
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flickable.contentX = pos.x
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flickable.contentY = pos.y
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}
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Binding {
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target: flickable
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property: "maximumFlickVelocity"
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value: mouseArea.enabled ? 0 : window.settings.kineticScrollingMaxSpeed
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}
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Binding {
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target: flickable
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property: "flickDeceleration"
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value:
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mouseArea.enabled ?
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0 :
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window.settings.kineticScrollingDeceleration
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}
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}
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