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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick
import Qt.labs.animation
Item {
id: root
property int value: 50
property int maximumValue: 99
property alias label: label.text
property alias tapEnabled: tap.enabled
property alias pressed: tap.pressed
signal tapped
DragHandler {
id: dragHandler
objectName: label.text + " DragHandler"
target: knob
xAxis.enabled: false
}
WheelHandler {
id: wheelHandler
objectName: label.text + " WheelHandler"
acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
invertible: false // Don't let the system "natural scrolling" setting affect this
rotationScale: -0.5 // But make it go consistently in the same direction as the fingers or wheel, a bit slow
target: knob
property: "y"
}
Rectangle {
id: slot
anchors.top: parent.top
anchors.bottom: parent.bottom
anchors.margins: 10
anchors.topMargin: label.height + 6
anchors.bottomMargin: valueLabel.height + 4
anchors.horizontalCenter: parent.horizontalCenter
width: 10
color: "black"
radius: width / 2
smooth: true
}
Rectangle {
// RectangularGlow is better, but that's a different module
id: glow
anchors.fill: knob
anchors.margins: -5
anchors.leftMargin: -2
anchors.horizontalCenterOffset: 1
radius: 5
color: "#4400FFFF"
opacity: tap.pressed || tapFlash.running ? 1 : 0
FlashAnimation on visible {
id: tapFlash
}
}
Image {
id: knob
source: "images/mixer-knob.png"
antialiasing: true
x: slot.x - width / 2 + slot.width / 2
height: root.width / 2
width: implicitWidth / implicitHeight * height
property bool programmatic: false
property real multiplier: root.maximumValue / (ybr.maximum - ybr.minimum)
onYChanged: if (!programmatic) root.value = root.maximumValue - (knob.y - ybr.minimum) * multiplier
transformOrigin: Item.Center
function setValue(value) { knob.y = ybr.maximum - value / knob.multiplier }
TapHandler {
id: tap
objectName: label.text + " TapHandler"
gesturePolicy: TapHandler.DragThreshold
onTapped: {
tapFlash.start()
root.tapped
}
}
BoundaryRule on y {
id: ybr
minimum: slot.y
maximum: slot.height + slot.y - knob.height
}
}
Text {
id: valueLabel
font.pointSize: 16
color: "red"
anchors.bottom: parent.bottom
anchors.horizontalCenter: parent.horizontalCenter
text: root.value
}
Text {
id: label
font.pointSize: 12
color: "red"
anchors.top: parent.top
anchors.topMargin: 5
anchors.horizontalCenter: parent.horizontalCenter
}
onHeightChanged: {
knob.programmatic = true
knob.setValue(root.value)
knob.programmatic = false
}
}
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