Lomiri
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PanelVelocityCalculator.qml
1/*
2 * Copyright (C) 2014 Canonical Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17import QtQuick 2.12
18import Lomiri.Gestures 0.1
19
20Item {
21 id: root
22 property real trackedValue: 0
23 property bool velocityAboveThreshold: false
24 property real velocityThreshold: 0.4
25
26 function reset() {
27 velocityTimer.stop();
28 velocityAboveThreshold = false;
29 calc.reset();
30 }
31
32 function update() {
33 calc.trackedPosition = trackedValue;
34 velocityAboveThreshold = Math.abs(calc.calculate()) > velocityThreshold;
35
36 if (velocityAboveThreshold) { // only start timer if we're above the threshold.
37 velocityTimer.start();
38 } else {
39 velocityTimer.stop();
40 }
41 }
42
43 onTrackedValueChanged: update();
44
45 AxisVelocityCalculator {
46 id: calc
47 }
48
49 Timer {
50 id: velocityTimer
51 interval: 50
52 onTriggered: update();
53 }
54}