mirror of https://github.com/Nheko-Reborn/nheko
Nicolas Werner
1 year ago
parent
54e2295c21
commit
c25d0c6b2f
@ -1,96 +0,0 @@ |
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// Copyright (C) 2016 Michael Bohlender, <michael.bohlender@kdemail.net> |
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// Copyright (C) 2017 Christian Mollekopf, <mollekopf@kolabsystems.com> |
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// SPDX-FileCopyrightText: Nheko Contributors |
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// |
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// SPDX-License-Identifier: GPL-3.0-or-later |
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|
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/* |
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* Shamelessly stolen from: |
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* https://cgit.kde.org/kube.git/tree/framework/qml/ScrollHelper.qml |
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* |
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* The MouseArea + interactive: false + maximumFlickVelocity are required |
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* to fix scrolling for desktop systems where we don't want flicking behaviour. |
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* |
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* See also: |
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* ScrollView.qml in qtquickcontrols |
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* qquickwheelarea.cpp in qtquickcontrols |
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*/ |
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|
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import QtQuick 2.9 |
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import QtQuick.Controls 2.3 |
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|
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MouseArea { |
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// console.warn("Delta: ", wheel.pixelDelta.y); |
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// console.warn("Old position: ", flickable.contentY); |
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// console.warn("New position: ", newPos); |
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// breaks ListView's with headers... |
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//if (typeof (flickableItem.headerItem) !== "undefined" && flickableItem.headerItem) |
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// minYExtent += flickableItem.headerItem.height; |
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|
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id: root |
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property Flickable flickable |
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property alias enabled: root.enabled |
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function calculateNewPosition(flickableItem, wheel) { |
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//Nothing to scroll |
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if (flickableItem.contentHeight < flickableItem.height) |
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return flickableItem.contentY; |
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|
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//Ignore 0 events (happens at least with Christians trackpad) |
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if (wheel.pixelDelta.y == 0 && wheel.angleDelta.y == 0) |
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return flickableItem.contentY; |
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|
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//pixelDelta seems to be the same as angleDelta/8 |
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var pixelDelta = 0; |
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//The pixelDelta is a smaller number if both are provided, so pixelDelta can be 0 while angleDelta is still something. So we check the angleDelta |
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if (wheel.angleDelta.y) { |
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var wheelScrollLines = 3; //Default value of QApplication wheelScrollLines property |
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var pixelPerLine = 20; //Default value in Qt, originally comes from QTextEdit |
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var ticks = (wheel.angleDelta.y / 8) / 15; //Divide by 8 gives us pixels typically come in 15pixel steps. |
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pixelDelta = ticks * pixelPerLine * wheelScrollLines; |
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} else { |
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pixelDelta = wheel.pixelDelta.y; |
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} |
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pixelDelta = Math.round(pixelDelta); |
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if (!pixelDelta) |
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return flickableItem.contentY; |
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|
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var minYExtent = flickableItem.originY + flickableItem.topMargin; |
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var maxYExtent = (flickableItem.contentHeight + flickableItem.bottomMargin + flickableItem.originY) - flickableItem.height; |
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//Avoid overscrolling |
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return Math.max(minYExtent, Math.min(maxYExtent, flickableItem.contentY - pixelDelta)); |
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} |
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propagateComposedEvents: true |
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//Place the mouse area under the flickable |
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z: -1 |
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onFlickableChanged: { |
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if (enabled) { |
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flickable.maximumFlickVelocity = 100000; |
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flickable.boundsBehavior = Flickable.StopAtBounds; |
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root.parent = flickable; |
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} |
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} |
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acceptedButtons: Qt.NoButton |
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onWheel: { |
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var newPos = calculateNewPosition(flickable, wheel); |
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// Show the scrollbars |
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flickable.flick(0, 0); |
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flickable.contentY = newPos; |
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cancelFlickStateTimer.restart(); |
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} |
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Timer { |
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id: cancelFlickStateTimer |
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|
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//How long the scrollbar will remain visible |
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interval: 500 |
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// Hide the scrollbars |
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onTriggered: { |
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flickable.cancelFlick(); |
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flickable.movementEnded(); |
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} |
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} |
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|
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} |
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