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* Copyright (C) 2013 Canonical, Ltd.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 3.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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import Ubuntu.Components 0.1
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import "Math.js" as MathLocal
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property int orientation: Qt.Vertical
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property bool dragging
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property real dragVelocity: 0
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property real dragValue: (orientation == Qt.Vertical ? (mouseY - __pressedPosition.y)
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: (mouseX - __pressedPosition.x))
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property real lateralPosition: orientation == Qt.Horizontal ? MathLocal.clamp(mouseY, 0, height) : MathLocal.clamp(mouseX, 0, width)
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property point __pressedPosition: Qt.point(0, 0)
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property var __dragEvents: []
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property bool clickValidated: true
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property bool zeroVelocityCounts: false
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// Can be replaced with a fake implementation during tests
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// property var __getCurrentTimeMs: function () { return new Date().getTime() }
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property var __dateTime: new function() {
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this.getCurrentTimeMs = function() {return new Date().getTime()}
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if (dragValue != 0 && pressed) {
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function updateSpeed() {
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for (var i=0; i<__dragEvents.length; i++) {
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totalSpeed += __dragEvents[i][3]
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if (zeroVelocityCounts || Math.abs(totalSpeed) > 0.001) {
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dragVelocity = totalSpeed / __dragEvents.length * 1000
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function cullOldDragEvents(currentTime) {
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// cull events older than 50 ms but always keep the latest 2 events
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for (var numberOfCulledEvents=0; numberOfCulledEvents<__dragEvents.length-2; numberOfCulledEvents++) {
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// __dragEvents[numberOfCulledEvents][0] is the dragTime
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if (currentTime - __dragEvents[numberOfCulledEvents][0] <= 50) break
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__dragEvents.splice(0, numberOfCulledEvents)
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function getEventSpeed(currentTime, event) {
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if (__dragEvents.length != 0) {
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var lastDrag = __dragEvents[__dragEvents.length-1]
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var duration = Math.max(1, currentTime - lastDrag[0])
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if (orientation == Qt.Vertical) {
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return (event.y - lastDrag[2]) / duration
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return (event.x - lastDrag[1]) / duration
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function pushDragEvent(event) {
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var currentTime = __dateTime.getCurrentTimeMs()
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__dragEvents.push([currentTime, event.x, event.y, getEventSpeed(currentTime, event)])
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cullOldDragEvents(currentTime)
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if (!draggingArea.containsMouse)
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clickValidated = false
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__pressedPosition = Qt.point(mouse.x, mouse.y)
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clickValidated = true
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__pressedPosition = Qt.point(mouse.x, mouse.y)