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latte-dock/declarativeimports/components/ScrollArea.qml

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QML

/*
* Copyright 2019 Michail Vourlakos <mvourlakos@gmail.com>
*
* This file is part of Latte-Dock
*
* Latte-Dock is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Latte-Dock is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.1
MouseArea{
id: __scrollArea
property bool wheelIsBlocked: false
property bool delayIsEnabled: true
property int delay: 75
signal scrolledUp(QtObject wheel);
signal scrolledDown(QtObject wheel);
onWheel: {
if (delayIsEnabled && wheelIsBlocked){
return;
} else {
wheelIsBlocked = true;
__scrollDelayer.start();
}
var angle = wheel.angleDelta.y / 8;
if (angle > 12) {
//positive direction
__scrollArea.scrolledUp(wheel);
} else if (angle < -12) {
//negative direction
__scrollArea.scrolledDown(wheel);
}
}
//! A timer is needed in order to handle also touchpads that probably
//! send too many signals very fast. This way the signals per sec are limited.
//! The user needs to have a steady normal scroll in order to not
//! notice a annoying delay
Timer{
id: __scrollDelayer
interval: __scrollArea.delay
onTriggered: __scrollArea.wheelIsBlocked = false;
}
}