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react-slider.js
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react-slider.js
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(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define(['react'], factory);
} else if (typeof exports === 'object') {
module.exports = factory(require('react'));
} else {
root.ReactSlider = factory(root.React);
}
}(this, function (React) {
/**
* To prevent text selection while dragging.
* http://stackoverflow.com/questions/5429827/how-can-i-prevent-text-element-selection-with-cursor-drag
*/
function pauseEvent(e) {
if (e.stopPropagation) e.stopPropagation();
if (e.preventDefault) e.preventDefault();
e.cancelBubble = true;
e.returnValue = false;
return false;
}
function stopPropagation(e) {
if (e.stopPropagation) e.stopPropagation();
e.cancelBubble = true;
}
/**
* Spreads `count` values equally between `min` and `max`.
*/
function linspace(min, max, count) {
var range = (max - min) / (count - 1);
var res = [];
for (var i = 0; i < count; i++) {
res.push(min + range * i);
}
return res;
}
function ensureArray(x) {
return x == null ? [] : Array.isArray(x) ? x : [x];
}
function undoEnsureArray(x) {
return x != null && x.length === 1 ? x[0] : x;
}
// undoEnsureArray(ensureArray(x)) === x
var ReactSlider = React.createClass({
displayName: 'ReactSlider',
propTypes: {
/**
* The minimum value of the slider.
*/
min: React.PropTypes.number,
/**
* The maximum value of the slider.
*/
max: React.PropTypes.number,
/**
* Value to be added or subtracted on each step the slider makes.
* Must be greater than zero.
* `max - min` should be evenly divisible by the step value.
*/
step: React.PropTypes.number,
/**
* The minimal distance between any pair of handles.
* Must be positive, but zero means they can sit on top of each other.
*/
minDistance: React.PropTypes.number,
/**
* Determines the initial positions of the handles and the number of handles if the component has no children.
*
* If a number is passed a slider with one handle will be rendered.
* If an array is passed each value will determine the position of one handle.
* The values in the array must be sorted.
* If the component has children, the length of the array must match the number of children.
*/
defaultValue: React.PropTypes.oneOfType([
React.PropTypes.number,
React.PropTypes.arrayOf(React.PropTypes.number)
]),
/**
* Like `defaultValue` but for [controlled components](http://facebook.github.io/react/docs/forms.html#controlled-components).
*/
value: React.PropTypes.oneOfType([
React.PropTypes.number,
React.PropTypes.arrayOf(React.PropTypes.number)
]),
/**
* Determines whether the slider moves horizontally (from left to right) or vertically (from top to bottom).
*/
orientation: React.PropTypes.oneOf(['horizontal', 'vertical']),
/**
* The css class set on the slider node.
*/
className: React.PropTypes.string,
/**
* The css class set on each handle node.
*
* In addition each handle will receive a numbered css class of the form `${handleClassName}-${i}`,
* e.g. `handle-0`, `handle-1`, ...
*/
handleClassName: React.PropTypes.string,
/**
* The css class set on the handle that is currently being moved.
*/
handleActiveClassName: React.PropTypes.string,
/**
* If `true` bars between the handles will be rendered.
*/
withBars: React.PropTypes.bool,
/**
* The css class set on the bars between the handles.
* In addition bar fragment will receive a numbered css class of the form `${barClassName}-${i}`,
* e.g. `bar-0`, `bar-1`, ...
*/
barClassName: React.PropTypes.string,
/**
* If `true` the active handle will push other handles
* within the constraints of `min`, `max`, `step` and `minDistance`.
*/
pearling: React.PropTypes.bool,
/**
* If `true` the handles can't be moved.
*/
disabled: React.PropTypes.bool,
/**
* Disables handle move when clicking the slider bar
*/
snapDragDisabled: React.PropTypes.bool,
/**
* Inverts the slider.
*/
invert: React.PropTypes.bool,
/**
* Callback called before starting to move a handle.
*/
onBeforeChange: React.PropTypes.func,
/**
* Callback called on every value change.
*/
onChange: React.PropTypes.func,
/**
* Callback called only after moving a handle has ended.
*/
onAfterChange: React.PropTypes.func,
/**
* Callback called when the the slider is clicked (handle or bars).
* Receives the value at the clicked position as argument.
*/
onSliderClick: React.PropTypes.func
},
getDefaultProps: function () {
return {
min: 0,
max: 100,
step: 1,
minDistance: 0,
defaultValue: 0,
orientation: 'horizontal',
className: 'slider',
handleClassName: 'handle',
handleActiveClassName: 'active',
barClassName: 'bar',
withBars: false,
pearling: false,
disabled: false,
snapDragDisabled: false,
invert: false
};
},
getInitialState: function () {
var value = this._or(ensureArray(this.props.value), ensureArray(this.props.defaultValue));
// reused throughout the component to store results of iterations over `value`
this.tempArray = value.slice();
// array for storing resize timeouts ids
this.pendingResizeTimeouts = [];
var zIndices = [];
for (var i = 0; i < value.length; i++) {
value[i] = this._trimAlignValue(value[i], this.props);
zIndices.push(i);
}
return {
index: -1,
upperBound: 0,
sliderLength: 0,
value: value,
zIndices: zIndices
};
},
// Keep the internal `value` consistent with an outside `value` if present.
// This basically allows the slider to be a controlled component.
componentWillReceiveProps: function (newProps) {
var value = this._or(ensureArray(newProps.value), this.state.value, newProps.children);
// ensure the array keeps the same size as `value`
this.tempArray = value.slice();
for (var i = 0; i < value.length; i++) {
this.state.value[i] = this._trimAlignValue(value[i], newProps);
}
if (this.state.value.length > value.length)
this.state.value.length = value.length;
// If an upperBound has not yet been determined (due to the component being hidden
// during the mount event, or during the last resize), then calculate it now
if (this.state.upperBound === 0) {
this._handleResize();
}
},
// Check if the arity of `value` or `defaultValue` matches the number of children (= number of custom handles).
// If no custom handles are provided, just returns `value` if present and `defaultValue` otherwise.
// If custom handles are present but neither `value` nor `defaultValue` are applicable the handles are spread out
// equally.
// TODO: better name? better solution?
_or: function (value, defaultValue, children) {
children = children || this.props.children;
var count = React.Children.count(children);
switch (count) {
case 0:
return value.length > 0 ? value : defaultValue;
case value.length:
return value;
case defaultValue.length:
return defaultValue;
default:
if (value.length !== count || defaultValue.length !== count) {
console.warn(this.constructor.displayName + ": Number of values does not match number of children.");
}
return linspace(this.props.min, this.props.max, count);
}
},
componentDidMount: function () {
window.addEventListener('resize', this._handleResize);
this._handleResize();
},
componentWillUnmount: function () {
this._clearPendingResizeTimeouts();
window.removeEventListener('resize', this._handleResize);
},
getValue: function () {
return undoEnsureArray(this.state.value);
},
_handleResize: function () {
// setTimeout of 0 gives element enough time to have assumed its new size if it is being resized
var resizeTimeout = window.setTimeout(function() {
// drop this timeout from pendingResizeTimeouts to reduce memory usage
this.pendingResizeTimeouts.shift();
var slider = this.refs.slider;
var handle = this.refs.handle0;
var rect = slider.getBoundingClientRect();
var size = this._sizeKey();
var sliderMax = rect[this._posMaxKey()];
var sliderMin = rect[this._posMinKey()];
this.setState({
upperBound: slider[size] - handle[size],
sliderLength: Math.abs(sliderMax - sliderMin),
handleSize: handle[size],
sliderStart: this.props.invert ? sliderMax : sliderMin
});
}.bind(this), 0);
this.pendingResizeTimeouts.push(resizeTimeout);
},
// clear all pending timeouts to avoid error messages after unmounting
_clearPendingResizeTimeouts: function() {
do {
var nextTimeout = this.pendingResizeTimeouts.shift();
clearTimeout(nextTimeout);
} while (this.pendingResizeTimeouts.length);
},
// calculates the offset of a handle in pixels based on its value.
_calcOffset: function (value) {
var ratio = (value - this.props.min) / (this.props.max - this.props.min);
return ratio * this.state.upperBound;
},
// calculates the value corresponding to a given pixel offset, i.e. the inverse of `_calcOffset`.
_calcValue: function (offset) {
var ratio = offset / this.state.upperBound;
return ratio * (this.props.max - this.props.min) + this.props.min;
},
_buildHandleStyle: function (offset, i) {
var style = {
position: 'absolute',
willChange: this.state.index >= 0 ? this._posMinKey() : '',
zIndex: this.state.zIndices.indexOf(i) + 1
};
style[this._posMinKey()] = offset + 'px';
return style;
},
_buildBarStyle: function (min, max) {
var obj = {
position: 'absolute',
willChange: this.state.index >= 0 ? this._posMinKey() + ',' + this._posMaxKey() : ''
};
obj[this._posMinKey()] = min;
obj[this._posMaxKey()] = max;
return obj;
},
_getClosestIndex: function (pixelOffset) {
var minDist = Number.MAX_VALUE;
var closestIndex = -1;
var value = this.state.value;
var l = value.length;
for (var i = 0; i < l; i++) {
var offset = this._calcOffset(value[i]);
var dist = Math.abs(pixelOffset - offset);
if (dist < minDist) {
minDist = dist;
closestIndex = i;
}
}
return closestIndex;
},
_calcOffsetFromPosition: function (position) {
var pixelOffset = position - this.state.sliderStart;
if (this.props.invert) pixelOffset = this.state.sliderLength - pixelOffset;
pixelOffset -= (this.state.handleSize / 2);
return pixelOffset;
},
// Snaps the nearest handle to the value corresponding to `position` and calls `callback` with that handle's index.
_forceValueFromPosition: function (position, callback) {
var pixelOffset = this._calcOffsetFromPosition(position);
var closestIndex = this._getClosestIndex(pixelOffset);
var nextValue = this._trimAlignValue(this._calcValue(pixelOffset));
var value = this.state.value.slice(); // Clone this.state.value since we'll modify it temporarily
value[closestIndex] = nextValue;
// Prevents the slider from shrinking below `props.minDistance`
for (var i = 0; i < value.length - 1; i += 1) {
if (value[i + 1] - value[i] < this.props.minDistance) return;
}
this.setState({value: value}, callback.bind(this, closestIndex));
},
_getMousePosition: function (e) {
return [
e['page' + this._axisKey()],
e['page' + this._orthogonalAxisKey()]
];
},
_getTouchPosition: function (e) {
var touch = e.touches[0];
return [
touch['page' + this._axisKey()],
touch['page' + this._orthogonalAxisKey()]
];
},
_getMouseEventMap: function () {
return {
'mousemove': this._onMouseMove,
'mouseup': this._onMouseUp
}
},
_getTouchEventMap: function () {
return {
'touchmove': this._onTouchMove,
'touchend': this._onTouchEnd
}
},
// create the `mousedown` handler for the i-th handle
_createOnMouseDown: function (i) {
return function (e) {
if (this.props.disabled) return;
var position = this._getMousePosition(e);
this._start(i, position[0]);
this._addHandlers(this._getMouseEventMap());
pauseEvent(e);
}.bind(this);
},
// create the `touchstart` handler for the i-th handle
_createOnTouchStart: function (i) {
return function (e) {
if (this.props.disabled || e.touches.length > 1) return;
var position = this._getTouchPosition(e);
this.startPosition = position;
this.isScrolling = undefined; // don't know yet if the user is trying to scroll
this._start(i, position[0]);
this._addHandlers(this._getTouchEventMap());
stopPropagation(e);
}.bind(this);
},
_addHandlers: function (eventMap) {
for (var key in eventMap) {
document.addEventListener(key, eventMap[key], false);
}
},
_removeHandlers: function (eventMap) {
for (var key in eventMap) {
document.removeEventListener(key, eventMap[key], false);
}
},
_start: function (i, position) {
// if activeElement is body window will lost focus in IE9
if (document.activeElement && document.activeElement != document.body) {
document.activeElement.blur();
}
this.hasMoved = false;
this._fireChangeEvent('onBeforeChange');
var zIndices = this.state.zIndices;
zIndices.splice(zIndices.indexOf(i), 1); // remove wherever the element is
zIndices.push(i); // add to end
this.setState({
startValue: this.state.value[i],
startPosition: position,
index: i,
zIndices: zIndices
});
},
_onMouseUp: function () {
this._onEnd(this._getMouseEventMap());
},
_onTouchEnd: function () {
this._onEnd(this._getTouchEventMap());
},
_onEnd: function (eventMap) {
this._removeHandlers(eventMap);
this.setState({index: -1}, this._fireChangeEvent.bind(this, 'onAfterChange'));
},
_onMouseMove: function (e) {
var position = this._getMousePosition(e);
this._move(position[0]);
},
_onTouchMove: function (e) {
if (e.touches.length > 1) return;
var position = this._getTouchPosition(e);
if (typeof this.isScrolling === 'undefined') {
var diffMainDir = position[0] - this.startPosition[0];
var diffScrollDir = position[1] - this.startPosition[1];
this.isScrolling = Math.abs(diffScrollDir) > Math.abs(diffMainDir);
}
if (this.isScrolling) {
this.setState({index: -1});
return;
}
pauseEvent(e);
this._move(position[0]);
},
_move: function (position) {
this.hasMoved = true;
var props = this.props;
var state = this.state;
var index = state.index;
var value = state.value;
var length = value.length;
var oldValue = value[index];
var diffPosition = position - state.startPosition;
if (props.invert) diffPosition *= -1;
var diffValue = diffPosition / (state.sliderLength - state.handleSize) * (props.max - props.min);
var newValue = this._trimAlignValue(state.startValue + diffValue);
var minDistance = props.minDistance;
// if "pearling" (= handles pushing each other) is disabled,
// prevent the handle from getting closer than `minDistance` to the previous or next handle.
if (!props.pearling) {
if (index > 0) {
var valueBefore = value[index - 1];
if (newValue < valueBefore + minDistance) {
newValue = valueBefore + minDistance;
}
}
if (index < length - 1) {
var valueAfter = value[index + 1];
if (newValue > valueAfter - minDistance) {
newValue = valueAfter - minDistance;
}
}
}
value[index] = newValue;
// if "pearling" is enabled, let the current handle push the pre- and succeeding handles.
if (props.pearling && length > 1) {
if (newValue > oldValue) {
this._pushSucceeding(value, minDistance, index);
this._trimSucceeding(length, value, minDistance, props.max);
}
else if (newValue < oldValue) {
this._pushPreceding(value, minDistance, index);
this._trimPreceding(length, value, minDistance, props.min);
}
}
// Normally you would use `shouldComponentUpdate`, but since the slider is a low-level component,
// the extra complexity might be worth the extra performance.
if (newValue !== oldValue) {
this.setState({value: value}, this._fireChangeEvent.bind(this, 'onChange'));
}
},
_pushSucceeding: function (value, minDistance, index) {
var i, padding;
for (i = index, padding = value[i] + minDistance;
value[i + 1] != null && padding > value[i + 1];
i++, padding = value[i] + minDistance) {
value[i + 1] = this._alignValue(padding);
}
},
_trimSucceeding: function (length, nextValue, minDistance, max) {
for (var i = 0; i < length; i++) {
var padding = max - i * minDistance;
if (nextValue[length - 1 - i] > padding) {
nextValue[length - 1 - i] = padding;
}
}
},
_pushPreceding: function (value, minDistance, index) {
var i, padding;
for (i = index, padding = value[i] - minDistance;
value[i - 1] != null && padding < value[i - 1];
i--, padding = value[i] - minDistance) {
value[i - 1] = this._alignValue(padding);
}
},
_trimPreceding: function (length, nextValue, minDistance, min) {
for (var i = 0; i < length; i++) {
var padding = min + i * minDistance;
if (nextValue[i] < padding) {
nextValue[i] = padding;
}
}
},
_axisKey: function () {
var orientation = this.props.orientation;
if (orientation === 'horizontal') return 'X';
if (orientation === 'vertical') return 'Y';
},
_orthogonalAxisKey: function () {
var orientation = this.props.orientation;
if (orientation === 'horizontal') return 'Y';
if (orientation === 'vertical') return 'X';
},
_posMinKey: function () {
var orientation = this.props.orientation;
if (orientation === 'horizontal') return this.props.invert ? 'right' : 'left';
if (orientation === 'vertical') return this.props.invert ? 'bottom' : 'top';
},
_posMaxKey: function () {
var orientation = this.props.orientation;
if (orientation === 'horizontal') return this.props.invert ? 'left' : 'right';
if (orientation === 'vertical') return this.props.invert ? 'top' : 'bottom';
},
_sizeKey: function () {
var orientation = this.props.orientation;
if (orientation === 'horizontal') return 'clientWidth';
if (orientation === 'vertical') return 'clientHeight';
},
_trimAlignValue: function (val, props) {
return this._alignValue(this._trimValue(val, props), props);
},
_trimValue: function (val, props) {
props = props || this.props;
if (val <= props.min) val = props.min;
if (val >= props.max) val = props.max;
return val;
},
_alignValue: function (val, props) {
props = props || this.props;
var valModStep = (val - props.min) % props.step;
var alignValue = val - valModStep;
if (Math.abs(valModStep) * 2 >= props.step) {
alignValue += (valModStep > 0) ? props.step : (-props.step);
}
return parseFloat(alignValue.toFixed(5));
},
_renderHandle: function (style, child, i) {
var className = this.props.handleClassName + ' ' +
(this.props.handleClassName + '-' + i) + ' ' +
(this.state.index === i ? this.props.handleActiveClassName : '');
return (
React.createElement('div', {
ref: 'handle' + i,
key: 'handle' + i,
className: className,
style: style,
onMouseDown: this._createOnMouseDown(i),
onTouchStart: this._createOnTouchStart(i)
},
child
)
);
},
_renderHandles: function (offset) {
var length = offset.length;
var styles = this.tempArray;
for (var i = 0; i < length; i++) {
styles[i] = this._buildHandleStyle(offset[i], i);
}
var res = this.tempArray;
var renderHandle = this._renderHandle;
if (React.Children.count(this.props.children) > 0) {
React.Children.forEach(this.props.children, function (child, i) {
res[i] = renderHandle(styles[i], child, i);
});
} else {
for (i = 0; i < length; i++) {
res[i] = renderHandle(styles[i], null, i);
}
}
return res;
},
_renderBar: function (i, offsetFrom, offsetTo) {
return (
React.createElement('div', {
key: 'bar' + i,
ref: 'bar' + i,
className: this.props.barClassName + ' ' + this.props.barClassName + '-' + i,
style: this._buildBarStyle(offsetFrom, this.state.upperBound - offsetTo)
})
);
},
_renderBars: function (offset) {
var bars = [];
var lastIndex = offset.length - 1;
bars.push(this._renderBar(0, 0, offset[0]));
for (var i = 0; i < lastIndex; i++) {
bars.push(this._renderBar(i + 1, offset[i], offset[i + 1]));
}
bars.push(this._renderBar(lastIndex + 1, offset[lastIndex], this.state.upperBound));
return bars;
},
_onSliderMouseDown: function (e) {
if (this.props.disabled) return;
this.hasMoved = false;
if (!this.props.snapDragDisabled) {
var position = this._getMousePosition(e);
this._forceValueFromPosition(position[0], function (i) {
this._fireChangeEvent('onChange');
this._start(i, position[0]);
this._addHandlers(this._getMouseEventMap());
}.bind(this));
}
pauseEvent(e);
},
_onSliderClick: function (e) {
if (this.props.disabled) return;
if (this.props.onSliderClick && !this.hasMoved) {
var position = this._getMousePosition(e);
var valueAtPos = this._trimAlignValue(this._calcValue(this._calcOffsetFromPosition(position[0])));
this.props.onSliderClick(valueAtPos);
}
},
_fireChangeEvent: function (event) {
if (this.props[event]) {
this.props[event](undoEnsureArray(this.state.value));
}
},
render: function () {
var state = this.state;
var props = this.props;
var offset = this.tempArray;
var value = state.value;
var l = value.length;
for (var i = 0; i < l; i++) {
offset[i] = this._calcOffset(value[i], i);
}
var bars = props.withBars ? this._renderBars(offset) : null;
var handles = this._renderHandles(offset);
return (
React.createElement('div', {
ref: 'slider',
style: {position: 'relative'},
className: props.className + (props.disabled ? ' disabled' : ''),
onMouseDown: this._onSliderMouseDown,
onClick: this._onSliderClick
},
bars,
handles
)
);
}
});
return ReactSlider;
}));