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flutter_xlider.dart
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/// A material design slider and range slider with horizontal and vertical axis, rtl support and lots of options and customizations for flutter
/*
* *
* * Written by Ali Azmoude <ali.azmoude@gmail.com>
* *
* *
* *
* * When I wrote this, only God and I understood what I was doing.
* * Now, God only knows "Karl Weierstrass"
* */
import 'package:flutter/material.dart';
import 'dart:math';
class FlutterSlider extends StatefulWidget {
final Key? key;
final Axis axis;
final double? handlerWidth;
final double? handlerHeight;
final FlutterSliderHandler? handler;
final FlutterSliderHandler? rightHandler;
final Function(int handlerIndex, dynamic lowerValue, dynamic upperValue)?
onDragStarted;
final Function(int handlerIndex, dynamic lowerValue, dynamic upperValue)?
onDragCompleted;
final Function(int handlerIndex, dynamic lowerValue, dynamic upperValue)?
onDragging;
final double? min;
final double? max;
final List<double> values;
final List<FlutterSliderFixedValue>? fixedValues;
final bool rangeSlider;
final bool rtl;
final bool jump;
final bool selectByTap;
final List<FlutterSliderIgnoreSteps> ignoreSteps;
final bool disabled;
final double? touchSize;
final bool visibleTouchArea;
final double minimumDistance;
final double maximumDistance;
final FlutterSliderHandlerAnimation handlerAnimation;
final FlutterSliderTooltip? tooltip;
final FlutterSliderTrackBar trackBar;
final FlutterSliderStep step;
final FlutterSliderHatchMark? hatchMark;
final bool centeredOrigin;
final bool lockHandlers;
final double? lockDistance;
final BoxDecoration? decoration;
final BoxDecoration? foregroundDecoration;
FlutterSlider(
{this.key,
this.min,
this.max,
required this.values,
this.fixedValues,
this.axis = Axis.horizontal,
this.handler,
this.rightHandler,
this.handlerHeight,
this.handlerWidth,
this.onDragStarted,
this.onDragCompleted,
this.onDragging,
this.rangeSlider = false,
this.rtl = false,
this.jump = false,
this.ignoreSteps = const [],
this.disabled = false,
this.touchSize,
this.visibleTouchArea = false,
this.minimumDistance = 0,
this.maximumDistance = 0,
this.tooltip,
this.trackBar = const FlutterSliderTrackBar(),
this.handlerAnimation = const FlutterSliderHandlerAnimation(),
this.selectByTap = true,
this.step = const FlutterSliderStep(),
this.hatchMark,
this.centeredOrigin = false,
this.lockHandlers = false,
this.lockDistance,
this.decoration,
this.foregroundDecoration})
: assert(touchSize == null || (touchSize >= 5 && touchSize <= 50)),
assert((ignoreSteps.length > 0 && step.rangeList == null) ||
(ignoreSteps.length == 0)),
assert((step.rangeList != null &&
minimumDistance == 0 &&
maximumDistance == 0) ||
(minimumDistance > 0 && step.rangeList == null) ||
(maximumDistance > 0 && step.rangeList == null) ||
(step.rangeList == null)),
assert(centeredOrigin == false ||
(centeredOrigin == true &&
rangeSlider == false &&
lockHandlers == false &&
minimumDistance == 0 &&
maximumDistance == 0)),
assert(lockHandlers == false ||
(centeredOrigin == false &&
(ignoreSteps.length == 0) &&
(fixedValues == null || fixedValues.length == 0) &&
rangeSlider == true &&
values.length > 1 &&
lockHandlers == true &&
lockDistance != null &&
step.rangeList == null &&
lockDistance >=
step.step /* && values[1] - values[0] == lockDistance*/)),
assert(
fixedValues != null || (min != null && max != null && min <= max),
"Min and Max are required if fixedValues is null"),
assert(
rangeSlider == false || (rangeSlider == true && values.length > 1),
"Range slider needs two values"),
// assert( fixedValues == null || (fixedValues != null && values[0] >= 0 && values[0] <= 100), "When using fixedValues, you should set values within the range of fixedValues" ),
// assert( fixedValues == null || (fixedValues != null && values.length > 1 && values[1] >= values[0] && values[1] <= 100), "When using fixedValues, you should set values within the range of fixedValues" ),
super(key: key);
@override
_FlutterSliderState createState() => _FlutterSliderState();
}
class _FlutterSliderState extends State<FlutterSlider>
with TickerProviderStateMixin {
bool __isInitCall = true;
double? _touchSize;
late Widget leftHandler;
late Widget rightHandler;
double? _leftHandlerXPosition = 0;
double? _rightHandlerXPosition = 0;
double? _leftHandlerYPosition = 0;
double? _rightHandlerYPosition = 0;
double? _lowerValue = 0;
double? _upperValue = 0;
dynamic _outputLowerValue = 0;
dynamic _outputUpperValue = 0;
double? _realMin;
double? _realMax;
late double _divisions;
double _handlersPadding = 0;
GlobalKey leftHandlerKey = GlobalKey();
GlobalKey rightHandlerKey = GlobalKey();
GlobalKey containerKey = GlobalKey();
GlobalKey leftTooltipKey = GlobalKey();
GlobalKey rightTooltipKey = GlobalKey();
double? _handlersWidth;
double? _handlersHeight;
late double _constraintMaxWidth;
late double _constraintMaxHeight;
double? _containerWidthWithoutPadding;
double? _containerHeightWithoutPadding;
double _containerLeft = 0;
double _containerTop = 0;
late FlutterSliderTooltip _tooltipData;
late List<Function> _positionedItems;
double _rightTooltipOpacity = 0;
double _leftTooltipOpacity = 0;
late AnimationController _rightTooltipAnimationController;
Animation<Offset>? _rightTooltipAnimation;
late AnimationController _leftTooltipAnimationController;
Animation<Offset>? _leftTooltipAnimation;
AnimationController? _leftHandlerScaleAnimationController;
Animation<double>? _leftHandlerScaleAnimation;
AnimationController? _rightHandlerScaleAnimationController;
Animation<double>? _rightHandlerScaleAnimation;
double? _containerHeight;
double? _containerWidth;
int _decimalScale = 0;
double xDragTmp = 0;
double yDragTmp = 0;
double? xDragStart;
double? yDragStart;
double? _widgetStep;
double? _widgetMin;
double? _widgetMax;
List<FlutterSliderIgnoreSteps> _ignoreSteps = [];
List<FlutterSliderFixedValue> _fixedValues = [];
List<Positioned> _points = [];
bool __dragging = false;
double? __dAxis,
__rAxis,
__axisDragTmp,
__axisPosTmp,
__containerSizeWithoutPadding,
__rightHandlerPosition,
__leftHandlerPosition,
__containerSizeWithoutHalfPadding;
Orientation? oldOrientation;
double __lockedHandlersDragOffset = 0;
double? _distanceFromRightHandler, _distanceFromLeftHandler;
double _handlersDistance = 0;
bool _slidingByActiveTrackBar = false;
bool _leftTapAndSlide = false;
bool _rightTapAndSlide = false;
bool _trackBarSlideOnDragStartedCalled = false;
@override
void initState() {
initMethod();
super.initState();
}
@override
void didUpdateWidget(FlutterSlider oldWidget) {
__isInitCall = false;
initMethod();
super.didUpdateWidget(oldWidget);
}
@override
void dispose() {
_rightTooltipAnimationController.dispose();
_leftTooltipAnimationController.dispose();
_leftHandlerScaleAnimationController!.dispose();
_rightHandlerScaleAnimationController!.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return OrientationBuilder(
builder: (context, orientation) {
oldOrientation ??= MediaQuery.of(context).orientation;
return LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
_constraintMaxWidth = constraints.maxWidth;
_constraintMaxHeight = constraints.maxHeight;
_containerWidthWithoutPadding = _constraintMaxWidth - _handlersWidth!;
_containerHeightWithoutPadding =
_constraintMaxHeight - _handlersHeight!;
double? sliderProperSize = _findProperSliderSize();
if (widget.axis == Axis.vertical) {
double layoutWidth = constraints.maxWidth;
if (layoutWidth == double.infinity) {
layoutWidth = 0;
}
__containerSizeWithoutPadding = _containerHeightWithoutPadding;
_containerWidth =
[(sliderProperSize! * 2), layoutWidth].reduce(max);
_containerHeight = constraints.maxHeight;
} else {
double layoutHeight = constraints.maxHeight;
if (layoutHeight == double.infinity) {
layoutHeight = 0;
}
_containerWidth = constraints.maxWidth;
_containerHeight =
[(sliderProperSize! * 2), layoutHeight].reduce(max);
__containerSizeWithoutPadding = _containerWidthWithoutPadding;
}
if (MediaQuery.of(context).orientation != oldOrientation) {
_leftHandlerXPosition = 0;
_rightHandlerXPosition = 0;
_leftHandlerYPosition = 0;
_rightHandlerYPosition = 0;
_renderBoxInitialization();
_arrangeHandlersPosition();
_drawHatchMark();
oldOrientation = MediaQuery.of(context).orientation;
}
return Stack(
clipBehavior: Clip.none,
children: <Widget>[
// ..._points,
Container(
key: containerKey,
height: _containerHeight,
width: _containerWidth,
child: Stack(
clipBehavior: Clip.none,
children: drawHandlers(),
),
foregroundDecoration: widget.foregroundDecoration,
decoration: widget.decoration,
),
],
);
});
},
);
}
double? _findProperSliderSize() {
List<double?> sizes = [
widget.trackBar.activeTrackBarHeight,
widget.trackBar.inactiveTrackBarHeight
];
if (widget.axis == Axis.horizontal) {
sizes.add(_handlersHeight);
} else {
sizes.add(_handlersWidth);
}
return sizes.reduce((value, element) => max(value!, element!));
}
void initMethod() {
_widgetMax = widget.max;
_widgetMin = widget.min;
_touchSize = widget.touchSize ?? 15;
// validate inputs
_validations();
// to display min of the range correctly.
// if we use fakes, then min is always 0
// so calculations works well, but when we want to display
// result numbers to user, we add ( _widgetMin ) to the final numbers
// if(widget.axis == Axis.vertical) {
// animationStart = Offset(0.20, 0);
// animationFinish = Offset(-0.52, 0);
// }
if (__isInitCall) {
_leftHandlerScaleAnimationController = AnimationController(
duration: widget.handlerAnimation.duration, vsync: this);
_rightHandlerScaleAnimationController = AnimationController(
duration: widget.handlerAnimation.duration, vsync: this);
}
_leftHandlerScaleAnimation =
Tween(begin: 1.0, end: widget.handlerAnimation.scale).animate(
CurvedAnimation(
parent: _leftHandlerScaleAnimationController!,
reverseCurve: widget.handlerAnimation.reverseCurve,
curve: widget.handlerAnimation.curve));
_rightHandlerScaleAnimation =
Tween(begin: 1.0, end: widget.handlerAnimation.scale).animate(
CurvedAnimation(
parent: _rightHandlerScaleAnimationController!,
reverseCurve: widget.handlerAnimation.reverseCurve,
curve: widget.handlerAnimation.curve));
_setParameters();
_setValues();
if (widget.rangeSlider == true &&
widget.maximumDistance > 0 &&
(_upperValue! - _lowerValue!) > widget.maximumDistance) {
throw 'lower and upper distance is more than maximum distance';
}
if (widget.rangeSlider == true &&
widget.minimumDistance > 0 &&
(_upperValue! - _lowerValue!) < widget.minimumDistance) {
throw 'lower and upper distance is less than minimum distance';
}
Offset animationStart = Offset(0, 0);
if (widget.tooltip != null &&
widget.tooltip!.disableAnimation != null &&
widget.tooltip!.disableAnimation!) {
animationStart = Offset(0, -1);
}
Offset? animationFinish;
switch (_tooltipData.direction) {
case FlutterSliderTooltipDirection.top:
animationFinish = Offset(0, -1);
break;
case FlutterSliderTooltipDirection.left:
animationFinish = Offset(-1, 0);
break;
case FlutterSliderTooltipDirection.right:
animationFinish = Offset(1, 0);
break;
default:
animationFinish = Offset.zero;
break;
}
if (__isInitCall) {
_rightTooltipOpacity = (_tooltipData.alwaysShowTooltip == true) ? 1 : 0;
_leftTooltipOpacity = (_tooltipData.alwaysShowTooltip == true) ? 1 : 0;
_leftTooltipAnimationController = AnimationController(
duration: Duration(milliseconds: 200), vsync: this);
_rightTooltipAnimationController = AnimationController(
duration: Duration(milliseconds: 200), vsync: this);
} else {
if (_tooltipData.alwaysShowTooltip!) {
_rightTooltipOpacity = _leftTooltipOpacity = 1;
}
}
_leftTooltipAnimation =
Tween<Offset>(begin: animationStart, end: animationFinish).animate(
CurvedAnimation(
parent: _leftTooltipAnimationController,
curve: Curves.fastOutSlowIn));
_rightTooltipAnimation =
Tween<Offset>(begin: animationStart, end: animationFinish).animate(
CurvedAnimation(
parent: _rightTooltipAnimationController,
curve: Curves.fastOutSlowIn));
WidgetsBinding.instance!.addPostFrameCallback((_) {
_renderBoxInitialization();
_arrangeHandlersPosition();
_drawHatchMark();
setState(() {});
});
}
void _drawHatchMark() {
if (widget.hatchMark == null || widget.hatchMark!.disabled) return;
_points = [];
double maxTrackBarHeight = [
widget.trackBar.inactiveTrackBarHeight,
widget.trackBar.activeTrackBarHeight
].reduce(max);
FlutterSliderHatchMark hatchMark = FlutterSliderHatchMark();
hatchMark.disabled = widget.hatchMark!.disabled;
hatchMark.density = widget.hatchMark!.density;
hatchMark.linesDistanceFromTrackBar =
widget.hatchMark!.linesDistanceFromTrackBar ?? 0;
hatchMark.labelsDistanceFromTrackBar =
widget.hatchMark!.labelsDistanceFromTrackBar ?? 0;
hatchMark.smallLine = widget.hatchMark!.smallLine ??
FlutterSliderSizedBox(
height: 5,
width: 1,
decoration: BoxDecoration(color: Colors.black45));
hatchMark.bigLine = widget.hatchMark!.bigLine ??
FlutterSliderSizedBox(
height: 9,
width: 2,
decoration: BoxDecoration(color: Colors.black45));
hatchMark.labelBox = widget.hatchMark!.labelBox ??
FlutterSliderSizedBox(height: 50, width: 50);
hatchMark.labels = widget.hatchMark!.labels ?? null;
hatchMark.linesAlignment = widget.hatchMark!.linesAlignment;
hatchMark.displayLines = widget.hatchMark!.displayLines ?? false;
if (hatchMark.displayLines!) {
double percent = 100 * hatchMark.density;
double barWidth, barHeight, distance;
double? linesTop, linesLeft, linesRight, linesBottom;
if (widget.axis == Axis.horizontal) {
// top = hatchMark.linesDistanceFromTrackBar - 2.25;
distance = ((_constraintMaxWidth - _handlersWidth!) / percent);
} else {
// left = hatchMark.linesDistanceFromTrackBar - 3.62;
distance = ((_constraintMaxHeight - _handlersHeight!) / percent);
}
Alignment linesAlignment;
if (widget.axis == Axis.horizontal) {
if (hatchMark.linesAlignment == FlutterSliderHatchMarkAlignment.left) {
linesAlignment = Alignment.bottomCenter;
} else {
linesAlignment = Alignment.topCenter;
}
} else {
if (hatchMark.linesAlignment == FlutterSliderHatchMarkAlignment.left) {
linesAlignment = Alignment.centerRight;
} else {
linesAlignment = Alignment.centerLeft;
}
}
Widget barLine;
for (int p = 0; p <= percent; p++) {
FlutterSliderSizedBox? barLineBox = hatchMark.smallLine;
if (p % 5 - 1 == -1) {
barLineBox = hatchMark.bigLine;
}
if (widget.axis == Axis.horizontal) {
barHeight = barLineBox!.height;
barWidth = barLineBox.width;
} else {
barHeight = barLineBox!.width;
barWidth = barLineBox.height;
}
barLine = Align(
alignment: linesAlignment,
child: Container(
decoration: barLineBox.decoration,
foregroundDecoration: barLineBox.foregroundDecoration,
transform: barLineBox.transform,
height: barHeight,
width: barWidth,
),
);
if (widget.axis == Axis.horizontal) {
// left = (p * distance) + _handlersPadding - labelBoxHalfSize - 0.5;
linesLeft = (p * distance) + _handlersPadding - 0.75;
if (hatchMark.linesAlignment ==
FlutterSliderHatchMarkAlignment.right) {
linesTop = _containerHeight! / 2 + maxTrackBarHeight / 2 + 2;
linesBottom = _containerHeight! / 2 - maxTrackBarHeight - 15;
} else {
linesTop = _containerHeight! / 2 - maxTrackBarHeight - 15;
linesBottom = _containerHeight! / 2 + maxTrackBarHeight / 2 + 2;
}
if (hatchMark.linesAlignment == FlutterSliderHatchMarkAlignment.left)
linesBottom += hatchMark.linesDistanceFromTrackBar!;
else
linesTop += hatchMark.linesDistanceFromTrackBar!;
} else {
linesTop = (p * distance) + _handlersPadding - 0.5;
if (hatchMark.linesAlignment ==
FlutterSliderHatchMarkAlignment.right) {
linesLeft = _containerWidth! / 2 + maxTrackBarHeight / 2 + 2;
linesRight = _containerWidth! / 2 - maxTrackBarHeight - 15;
} else {
linesLeft = _containerWidth! / 2 - maxTrackBarHeight - 15;
linesRight = _containerWidth! / 2 + maxTrackBarHeight / 2 + 2;
}
if (hatchMark.linesAlignment == FlutterSliderHatchMarkAlignment.left)
linesRight += hatchMark.linesDistanceFromTrackBar!;
else
linesLeft += hatchMark.linesDistanceFromTrackBar!;
}
_points.add(Positioned(
top: linesTop,
bottom: linesBottom,
left: linesLeft,
right: linesRight,
child: barLine));
}
}
if (hatchMark.labels != null && hatchMark.labels!.length > 0) {
List<Widget> labelWidget = [];
Widget? label;
double labelBoxHalfSize;
double? top, left, bottom, right;
double? tr;
for (FlutterSliderHatchMarkLabel markLabel in hatchMark.labels!) {
label = markLabel.label;
tr = markLabel.percent;
labelBoxHalfSize = 0;
if (widget.rtl) tr = 100 - tr!;
if (widget.axis == Axis.horizontal) {
labelBoxHalfSize = hatchMark.labelBox!.width / 2 - 0.5;
} else {
labelBoxHalfSize = hatchMark.labelBox!.height / 2 - 0.5;
}
labelWidget = [
Container(
height: widget.axis == Axis.vertical
? hatchMark.labelBox!.height
: null,
width: widget.axis == Axis.horizontal
? hatchMark.labelBox!.width
: null,
decoration: hatchMark.labelBox!.decoration,
foregroundDecoration: hatchMark.labelBox!.foregroundDecoration,
transform: hatchMark.labelBox!.transform,
child: Align(alignment: Alignment.center, child: label),
)
];
Widget bar;
if (widget.axis == Axis.horizontal) {
bar = Column(
mainAxisAlignment: MainAxisAlignment.center,
children: labelWidget,
);
left = tr! * _containerWidthWithoutPadding! / 100 -
0.5 +
_handlersPadding -
labelBoxHalfSize;
// left = (tr * distance) + _handlersPadding - labelBoxHalfSize - 0.5;
top = hatchMark.labelsDistanceFromTrackBar;
bottom = 0;
} else {
bar = Row(
mainAxisAlignment: MainAxisAlignment.center,
children: labelWidget,
);
top = tr! * _containerHeightWithoutPadding! / 100 -
0.5 +
_handlersPadding -
labelBoxHalfSize;
right = 0;
left = hatchMark.labelsDistanceFromTrackBar;
}
_points.add(Positioned(
top: top, bottom: bottom, left: left, right: right, child: bar));
}
}
}
void _validations() {
if (widget.rangeSlider == true && widget.values.length < 2)
throw 'when range mode is true, slider needs both lower and upper values';
if (widget.fixedValues == null) {
if (widget.values[0] < _widgetMin!)
throw 'Lower value should be greater than min';
if (widget.rangeSlider == true) {
if (widget.values[1] > _widgetMax!)
throw 'Upper value should be smaller than max';
}
} else {
if (!(widget.fixedValues != null &&
widget.values[0] >= 0 &&
widget.values[0] <= 100)) {
throw 'When using fixedValues, you should set values within the range of fixedValues';
}
if (widget.rangeSlider == true && widget.values.length > 1) {
if (!(widget.fixedValues != null &&
widget.values[1] >= 0 &&
widget.values[1] <= 100)) {
throw 'When using fixedValues, you should set values within the range of fixedValues';
}
}
}
if (widget.rangeSlider == true) {
if (widget.values[0] > widget.values[1])
throw 'Lower value must be smaller than upper value';
}
}
void _setParameters() {
_realMin = 0;
_widgetMax = widget.max;
_widgetMin = widget.min;
_ignoreSteps = [];
if (widget.fixedValues != null && widget.fixedValues!.length > 0) {
_realMax = 100;
_realMin = 0;
_widgetStep = 1;
_widgetMax = 100;
_widgetMin = 0;
List<double> fixedValuesIndices = [];
for (FlutterSliderFixedValue fixedValue in widget.fixedValues!) {
fixedValuesIndices.add(fixedValue.percent!.toDouble());
}
double lowerIgnoreBound = -1;
double upperIgnoreBound;
List<double> fixedV = [];
for (double fixedPercent = 0; fixedPercent <= 100; fixedPercent++) {
dynamic fValue = '';
for (FlutterSliderFixedValue fixedValue in widget.fixedValues!) {
if (fixedValue.percent == fixedPercent.toInt()) {
fixedValuesIndices.add(fixedValue.percent!.toDouble());
fValue = fixedValue.value;
upperIgnoreBound = fixedPercent;
if (fixedPercent > lowerIgnoreBound + 1 || lowerIgnoreBound == 0) {
if (lowerIgnoreBound > 0) lowerIgnoreBound += 1;
upperIgnoreBound = fixedPercent - 1;
_ignoreSteps.add(FlutterSliderIgnoreSteps(
from: lowerIgnoreBound, to: upperIgnoreBound));
}
lowerIgnoreBound = fixedPercent;
break;
}
}
_fixedValues.add(FlutterSliderFixedValue(
percent: fixedPercent.toInt(), value: fValue));
if (fValue.toString().isNotEmpty) {
fixedV.add(fixedPercent);
}
}
double? biggestPoint =
_findBiggestIgnorePoint(ignoreBeyondBoundaries: true);
if (!fixedV.contains(100)) {
_ignoreSteps
.add(FlutterSliderIgnoreSteps(from: biggestPoint! + 1, to: 101));
}
} else {
_realMax = _widgetMax! - _widgetMin!;
_widgetStep = widget.step.step;
}
_ignoreSteps..addAll(widget.ignoreSteps);
_handlersWidth = widget.handlerWidth ?? widget.handlerHeight ?? 35;
_handlersHeight = widget.handlerHeight ?? widget.handlerWidth ?? 35;
_setDivisionAndDecimalScale();
_positionedItems = [
_leftHandlerWidget,
_rightHandlerWidget,
];
FlutterSliderTooltip widgetTooltip =
widget.tooltip ?? FlutterSliderTooltip();
_tooltipData = FlutterSliderTooltip();
_tooltipData.boxStyle = widgetTooltip.boxStyle ??
FlutterSliderTooltipBox(
decoration: BoxDecoration(
border: Border.all(color: Colors.black12, width: 0.5),
color: Color(0xffffffff)));
_tooltipData.textStyle = widgetTooltip.textStyle ??
TextStyle(fontSize: 12, color: Colors.black38);
_tooltipData.leftPrefix = widgetTooltip.leftPrefix ?? null;
_tooltipData.leftSuffix = widgetTooltip.leftSuffix ?? null;
_tooltipData.rightPrefix = widgetTooltip.rightPrefix ?? null;
_tooltipData.rightSuffix = widgetTooltip.rightSuffix ?? null;
_tooltipData.alwaysShowTooltip = widgetTooltip.alwaysShowTooltip ?? false;
_tooltipData.disabled = widgetTooltip.disabled ?? false;
_tooltipData.disableAnimation = widgetTooltip.disableAnimation ?? false;
_tooltipData.direction =
widgetTooltip.direction ?? FlutterSliderTooltipDirection.top;
_tooltipData.positionOffset = widgetTooltip.positionOffset ?? null;
_tooltipData.format = widgetTooltip.format ?? null;
_tooltipData.custom = widgetTooltip.custom ?? null;
_arrangeHandlersZIndex();
_generateHandler();
_handlersDistance = widget.lockDistance ?? _upperValue! - _lowerValue!;
}
void _setDivisionAndDecimalScale() {
_divisions = _realMax! / _widgetStep!;
String tmpDecimalScale = '0';
List<String> tmpDecimalScaleArr = _widgetStep.toString().split(".");
if (tmpDecimalScaleArr.length > 1) tmpDecimalScale = tmpDecimalScaleArr[1];
if (int.parse(tmpDecimalScale) > 0) {
_decimalScale = tmpDecimalScale.length;
}
}
List<double?> _calculateUpperAndLowerValues() {
double? localLV, localUV;
localLV = widget.values[0];
if (widget.rangeSlider) {
localUV = widget.values[1];
} else {
// when direction is rtl, then we use left handler. so to make right hand side
// as blue ( as if selected ), then upper value should be max
if (widget.rtl) {
localUV = _widgetMax;
} else {
// when direction is ltr, so we use right handler, to make left hand side of handler
// as blue ( as if selected ), we set lower value to min, and upper value to (input lower value)
localUV = localLV;
localLV = _widgetMin;
}
}
return [localLV, localUV];
}
void _setValues() {
List<double?> localValues = _calculateUpperAndLowerValues();
_lowerValue = localValues[0]! - _widgetMin!;
_upperValue = localValues[1]! - _widgetMin!;
_outputUpperValue = _displayRealValue(_upperValue);
_outputLowerValue = _displayRealValue(_lowerValue);
if (widget.rtl == true) {
_outputLowerValue = _displayRealValue(_upperValue);
_outputUpperValue = _displayRealValue(_lowerValue);
double tmpUpperValue = _realMax! - _lowerValue!;
double tmpLowerValue = _realMax! - _upperValue!;
_lowerValue = tmpLowerValue;
_upperValue = tmpUpperValue;
}
}
void _arrangeHandlersPosition() {
if (!__dragging) {
if (widget.axis == Axis.horizontal) {
_handlersPadding = _handlersWidth! / 2;
_leftHandlerXPosition = getPositionByValue(_lowerValue);
_rightHandlerXPosition = getPositionByValue(_upperValue);
} else {
_handlersPadding = _handlersHeight! / 2;
_leftHandlerYPosition = getPositionByValue(_lowerValue);
_rightHandlerYPosition = getPositionByValue(_upperValue);
}
}
}
void _generateHandler() {
/*Right Handler Data*/
FlutterSliderHandler inputRightHandler =
widget.rightHandler ?? FlutterSliderHandler();
inputRightHandler.child ??= Icon(
(widget.axis == Axis.horizontal)
? Icons.chevron_left
: Icons.expand_less,
color: Colors.black45);
inputRightHandler.decoration ??= BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.black26,
blurRadius: 2,
spreadRadius: 0.2,
offset: Offset(0, 1))
], color: Colors.white, shape: BoxShape.circle);
rightHandler = _MakeHandler(
animation: _rightHandlerScaleAnimation,
id: rightHandlerKey,
visibleTouchArea: widget.visibleTouchArea,
handlerData: widget.rightHandler,
width: _handlersWidth,
height: _handlersHeight,
axis: widget.axis,
handlerIndex: 2,
touchSize: _touchSize);
leftHandler = _MakeHandler(
animation: _leftHandlerScaleAnimation,
id: leftHandlerKey,
visibleTouchArea: widget.visibleTouchArea,
handlerData: widget.handler,
width: _handlersWidth,
height: _handlersHeight,
rtl: widget.rtl,
rangeSlider: widget.rangeSlider,
axis: widget.axis,
touchSize: _touchSize);
if (widget.rangeSlider == false) {
rightHandler = leftHandler;
}
}
double getPositionByValue(value) {
if (widget.axis == Axis.horizontal)
return (((_constraintMaxWidth - _handlersWidth!) / _realMax!) * value) -
_touchSize!;
else
return (((_constraintMaxHeight - _handlersHeight!) / _realMax!) * value) -
_touchSize!;
}
double getValueByPosition(double position) {
double value = ((position / (__containerSizeWithoutPadding! / _divisions)) *
_widgetStep!);
value = (double.parse(value.toStringAsFixed(_decimalScale)) -
double.parse((value % _widgetStep!).toStringAsFixed(_decimalScale)));
return value;
}
double? getLengthByValue(value) {
return value * __containerSizeWithoutPadding / _realMax;
}
double getValueByPositionIgnoreOffset(double position) {
double value = ((position / (__containerSizeWithoutPadding! / _divisions)) *
_widgetStep!);
return value;
}
void _leftHandlerMove(PointerEvent pointer,
{double lockedHandlersDragOffset = 0,
double tappedPositionWithPadding = 0,
bool selectedByTap = false}) {
if (widget.disabled || (widget.handler != null && widget.handler!.disabled))
return;
_handlersDistance = widget.lockDistance ?? _upperValue! - _lowerValue!;
// Tip: lockedHandlersDragOffset only subtracts from left handler position
// because it calculates drag position only by left handler's position
if (lockedHandlersDragOffset == 0) __lockedHandlersDragOffset = 0;
if (selectedByTap) {
_callbacks('onDragStarted', 0);
}
bool validMove = true;
if (widget.axis == Axis.horizontal) {
__dAxis = pointer.position.dx -
tappedPositionWithPadding -
lockedHandlersDragOffset -
_containerLeft;
__axisDragTmp = xDragTmp;
__containerSizeWithoutPadding = _containerWidthWithoutPadding;
__rightHandlerPosition = _rightHandlerXPosition;
__leftHandlerPosition = _leftHandlerXPosition;
} else {
__dAxis = pointer.position.dy -
tappedPositionWithPadding -
lockedHandlersDragOffset -
_containerTop;
__axisDragTmp = yDragTmp;
__containerSizeWithoutPadding = _containerHeightWithoutPadding;
__rightHandlerPosition = _rightHandlerYPosition;
__leftHandlerPosition = _leftHandlerYPosition;
}
__axisPosTmp = __dAxis! - __axisDragTmp! + _touchSize!;
_checkRangeStep(getValueByPositionIgnoreOffset(__axisPosTmp!));
__rAxis = getValueByPosition(__axisPosTmp!);
if (widget.rangeSlider &&
widget.minimumDistance > 0 &&
(__rAxis! + widget.minimumDistance) >= _upperValue!) {
_lowerValue = (_upperValue! - widget.minimumDistance > _realMin!)
? _upperValue! - widget.minimumDistance
: _realMin;
_updateLowerValue(_lowerValue);
if (lockedHandlersDragOffset == 0) validMove = validMove & false;
}
if (widget.rangeSlider &&
widget.maximumDistance > 0 &&
__rAxis! <= (_upperValue! - widget.maximumDistance)) {
_lowerValue = (_upperValue! - widget.maximumDistance > _realMin!)
? _upperValue! - widget.maximumDistance
: _realMin;
_updateLowerValue(_lowerValue);
if (lockedHandlersDragOffset == 0) validMove = validMove & false;
}
double? tS = _touchSize;
if (widget.jump) {
tS = _touchSize! + _handlersPadding;
}
validMove = validMove & _leftHandlerIgnoreSteps(tS);
bool forcePosStop = false;
if (((__axisPosTmp! <= 0) ||
(__axisPosTmp! - tS! >= __rightHandlerPosition!))) {
forcePosStop = true;
}
if (validMove &&