/usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Slider.qml is in qml-module-qtquick-controls 5.9.5-0ubuntu1.
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**
** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the Qt Quick Controls module of the Qt Toolkit.
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import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Private 1.0
/*!
\qmltype Slider
\inqmlmodule QtQuick.Controls
\since 5.1
\ingroup controls
\brief Provides a vertical or horizontal slider control.
\image slider.png
The slider is the classic control for providing a bounded value. It lets
the user move a slider handle along a horizontal or vertical groove
and translates the handle's position into a value within the legal range.
\code
Slider {
value: 0.5
}
\endcode
The slider value is by default in the range [0, 1]. If integer values are
needed, you can set the \l stepSize.
You can create a custom appearance for a Slider by
assigning a \l {SliderStyle}.
*/
Control {
id: slider
/*!
\qmlproperty enumeration Slider::orientation
This property holds the layout orientation of the slider.
The default value is \c Qt.Horizontal.
*/
property int orientation: Qt.Horizontal
/*!
\qmlproperty real Slider::minimumValue
This property holds the minimum value of the slider.
The default value is \c{0.0}.
*/
property alias minimumValue: range.minimumValue
/*!
\qmlproperty real Slider::maximumValue
This property holds the maximum value of the slider.
The default value is \c{1.0}.
*/
property alias maximumValue: range.maximumValue
/*!
\qmlproperty bool Slider::updateValueWhileDragging
This property indicates whether the current \l value should be updated while
the user is moving the slider handle, or only when the button has been released.
This property could for instance be modified if changing the slider value would turn
out to be too time consuming.
The default value is \c true.
*/
property bool updateValueWhileDragging: true
/*!
\qmlproperty bool Slider::pressed
This property indicates whether the slider handle is being pressed.
*/
readonly property alias pressed: mouseArea.pressed
/*!
\qmlproperty bool Slider::hovered
This property indicates whether the slider handle is being hovered.
*/
readonly property alias hovered: mouseArea.handleHovered
/*!
\qmlproperty real Slider::stepSize
This property indicates the slider step size.
A value of 0 indicates that the value of the slider operates in a
continuous range between \l minimumValue and \l maximumValue.
Any non 0 value indicates a discrete stepSize. The following example
will generate a slider with integer values in the range [0-5].
\qml
Slider {
maximumValue: 5.0
stepSize: 1.0
}
\endqml
The default value is \c{0.0}.
*/
property alias stepSize: range.stepSize
/*!
\qmlproperty real Slider::value
This property holds the current value of the slider.
The default value is \c{0.0}.
*/
property alias value: range.value
/*!
\qmlproperty bool Slider::activeFocusOnPress
This property indicates whether the slider should receive active focus when
pressed.
*/
property bool activeFocusOnPress: false
/*!
\qmlproperty bool Slider::tickmarksEnabled
This property indicates whether the slider should display tickmarks
at step intervals. Tick mark spacing is calculated based on the
\l stepSize property.
The default value is \c false.
\note This property may be ignored on some platforms when using the native style (e.g. Android).
*/
property bool tickmarksEnabled: false
/*! \internal */
property bool __horizontal: orientation === Qt.Horizontal
/*! \internal
The extra arguments positionAtMinimum and positionAtMaximum are there to force
re-evaluation of the handle position when the constraints change (QTBUG-41255),
and the same for range.minimumValue (QTBUG-51765) and range.maximumValue (QTBUG-63354).
*/
property real __handlePos: range.valueForPosition(__horizontal ? fakeHandle.x : fakeHandle.y,
range.positionAtMinimum, range.positionAtMaximum, range.minimumValue, range.maximumValue)
activeFocusOnTab: true
Accessible.role: Accessible.Slider
/*! \internal */
function accessibleIncreaseAction() {
range.increaseSingleStep()
}
/*! \internal */
function accessibleDecreaseAction() {
range.decreaseSingleStep()
}
style: Settings.styleComponent(Settings.style, "SliderStyle.qml", slider)
Keys.onRightPressed: if (__horizontal) range.increaseSingleStep()
Keys.onLeftPressed: if (__horizontal) range.decreaseSingleStep()
Keys.onUpPressed: if (!__horizontal) range.increaseSingleStep()
Keys.onDownPressed: if (!__horizontal) range.decreaseSingleStep()
RangeModel {
id: range
minimumValue: 0.0
maximumValue: 1.0
value: 0
stepSize: 0.0
inverted: __horizontal ? false : true
positionAtMinimum: 0
positionAtMaximum: __horizontal ? slider.width - fakeHandle.width : slider.height - fakeHandle.height
}
Item {
id: fakeHandle
anchors.verticalCenter: __horizontal ? parent.verticalCenter : undefined
anchors.horizontalCenter: !__horizontal ? parent.horizontalCenter : undefined
width: __panel.handleWidth
height: __panel.handleHeight
function updatePos() {
if (updateValueWhileDragging && !mouseArea.drag.active)
range.position = __horizontal ? x : y
}
onXChanged: updatePos();
onYChanged: updatePos();
}
MouseArea {
id: mouseArea
anchors.fill: parent
hoverEnabled: Settings.hoverEnabled
property int clickOffset: 0
property real pressX: 0
property real pressY: 0
property bool handleHovered: false
function clamp ( val ) {
return Math.max(range.positionAtMinimum, Math.min(range.positionAtMaximum, val))
}
function updateHandlePosition(mouse, force) {
var pos, overThreshold
if (__horizontal) {
pos = clamp (mouse.x + clickOffset - fakeHandle.width/2)
overThreshold = Math.abs(mouse.x - pressX) >= Settings.dragThreshold
if (overThreshold)
preventStealing = true
if (overThreshold || force)
fakeHandle.x = pos
} else if (!__horizontal) {
pos = clamp (mouse.y + clickOffset- fakeHandle.height/2)
overThreshold = Math.abs(mouse.y - pressY) >= Settings.dragThreshold
if (overThreshold)
preventStealing = true
if (overThreshold || force)
fakeHandle.y = pos
}
}
onPositionChanged: {
if (pressed)
updateHandlePosition(mouse, !Settings.hasTouchScreen || preventStealing)
var point = mouseArea.mapToItem(fakeHandle, mouse.x, mouse.y)
handleHovered = fakeHandle.contains(Qt.point(point.x, point.y))
}
onPressed: {
if (slider.activeFocusOnPress)
slider.forceActiveFocus();
if (handleHovered) {
var point = mouseArea.mapToItem(fakeHandle, mouse.x, mouse.y)
clickOffset = __horizontal ? fakeHandle.width/2 - point.x : fakeHandle.height/2 - point.y
}
pressX = mouse.x
pressY = mouse.y
updateHandlePosition(mouse, !Settings.hasTouchScreen)
}
onReleased: {
updateHandlePosition(mouse, Settings.hasTouchScreen)
// If we don't update while dragging, this is the only
// moment that the range is updated.
if (!slider.updateValueWhileDragging)
range.position = __horizontal ? fakeHandle.x : fakeHandle.y;
clickOffset = 0
preventStealing = false
}
onExited: handleHovered = false
}
// During the drag, we simply ignore the position set from the range, this
// means that setting a value while dragging will not "interrupt" the
// dragging activity.
Binding {
when: !mouseArea.drag.active
target: fakeHandle
property: __horizontal ? "x" : "y"
value: range.position
}
WheelArea {
id: wheelarea
anchors.fill: parent
verticalValue: slider.value
horizontalValue: slider.value
horizontalMinimumValue: slider.minimumValue
horizontalMaximumValue: slider.maximumValue
verticalMinimumValue: slider.minimumValue
verticalMaximumValue: slider.maximumValue
property real step: (slider.maximumValue - slider.minimumValue)/(range.positionAtMaximum - range.positionAtMinimum)
onVerticalWheelMoved: {
if (verticalDelta !== 0) {
var delta = Math.abs(verticalDelta)*step > stepSize ? verticalDelta*step : verticalDelta/Math.abs(verticalDelta)*stepSize
value -= delta * (inverted ? 1 : -1)
}
}
onHorizontalWheelMoved: {
if (horizontalDelta !== 0) {
var delta = Math.abs(horizontalDelta)*step > stepSize ? horizontalDelta*step : horizontalDelta/Math.abs(horizontalDelta)*stepSize
value += delta * (inverted ? 1 : -1)
}
}
}
}
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