You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
674 lines
21 KiB
674 lines
21 KiB
var util = require('../util');
|
|
var hammerUtil = require('../hammerUtil');
|
|
var moment = require('../module/moment');
|
|
var Component = require('./component/Component');
|
|
var DateUtil = require('./DateUtil');
|
|
|
|
/**
|
|
* @constructor Range
|
|
* A Range controls a numeric range with a start and end value.
|
|
* The Range adjusts the range based on mouse events or programmatic changes,
|
|
* and triggers events when the range is changing or has been changed.
|
|
* @param {{dom: Object, domProps: Object, emitter: Emitter}} body
|
|
* @param {Object} [options] See description at Range.setOptions
|
|
*/
|
|
function Range(body, options) {
|
|
var now = moment().hours(0).minutes(0).seconds(0).milliseconds(0);
|
|
this.start = now.clone().add(-3, 'days').valueOf(); // Number
|
|
this.end = now.clone().add(4, 'days').valueOf(); // Number
|
|
|
|
this.body = body;
|
|
this.deltaDifference = 0;
|
|
this.scaleOffset = 0;
|
|
this.startToFront = false;
|
|
this.endToFront = true;
|
|
|
|
// default options
|
|
this.defaultOptions = {
|
|
start: null,
|
|
end: null,
|
|
direction: 'horizontal', // 'horizontal' or 'vertical'
|
|
moveable: true,
|
|
zoomable: true,
|
|
min: null,
|
|
max: null,
|
|
zoomMin: 10, // milliseconds
|
|
zoomMax: 1000 * 60 * 60 * 24 * 365 * 10000 // milliseconds
|
|
};
|
|
this.options = util.extend({}, this.defaultOptions);
|
|
|
|
this.props = {
|
|
touch: {}
|
|
};
|
|
this.animateTimer = null;
|
|
|
|
// drag listeners for dragging
|
|
this.body.emitter.on('dragstart', this._onDragStart.bind(this));
|
|
this.body.emitter.on('drag', this._onDrag.bind(this));
|
|
this.body.emitter.on('dragend', this._onDragEnd.bind(this));
|
|
|
|
// ignore dragging when holding
|
|
this.body.emitter.on('hold', this._onHold.bind(this));
|
|
|
|
// mouse wheel for zooming
|
|
this.body.emitter.on('mousewheel', this._onMouseWheel.bind(this));
|
|
this.body.emitter.on('DOMMouseScroll', this._onMouseWheel.bind(this)); // For FF
|
|
|
|
// pinch to zoom
|
|
this.body.emitter.on('touch', this._onTouch.bind(this));
|
|
this.body.emitter.on('pinch', this._onPinch.bind(this));
|
|
|
|
this.setOptions(options);
|
|
}
|
|
|
|
Range.prototype = new Component();
|
|
|
|
/**
|
|
* Set options for the range controller
|
|
* @param {Object} options Available options:
|
|
* {Number | Date | String} start Start date for the range
|
|
* {Number | Date | String} end End date for the range
|
|
* {Number} min Minimum value for start
|
|
* {Number} max Maximum value for end
|
|
* {Number} zoomMin Set a minimum value for
|
|
* (end - start).
|
|
* {Number} zoomMax Set a maximum value for
|
|
* (end - start).
|
|
* {Boolean} moveable Enable moving of the range
|
|
* by dragging. True by default
|
|
* {Boolean} zoomable Enable zooming of the range
|
|
* by pinching/scrolling. True by default
|
|
*/
|
|
Range.prototype.setOptions = function (options) {
|
|
if (options) {
|
|
// copy the options that we know
|
|
var fields = ['direction', 'min', 'max', 'zoomMin', 'zoomMax', 'moveable', 'zoomable', 'activate', 'hiddenDates'];
|
|
util.selectiveExtend(fields, this.options, options);
|
|
|
|
if ('start' in options || 'end' in options) {
|
|
// apply a new range. both start and end are optional
|
|
this.setRange(options.start, options.end);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Test whether direction has a valid value
|
|
* @param {String} direction 'horizontal' or 'vertical'
|
|
*/
|
|
function validateDirection (direction) {
|
|
if (direction != 'horizontal' && direction != 'vertical') {
|
|
throw new TypeError('Unknown direction "' + direction + '". ' +
|
|
'Choose "horizontal" or "vertical".');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set a new start and end range
|
|
* @param {Date | Number | String} [start]
|
|
* @param {Date | Number | String} [end]
|
|
* @param {boolean | number} [animate=false] If true, the range is animated
|
|
* smoothly to the new window.
|
|
* If animate is a number, the
|
|
* number is taken as duration
|
|
* Default duration is 500 ms.
|
|
*
|
|
*/
|
|
Range.prototype.setRange = function(start, end, animate) {
|
|
var _start = start != undefined ? util.convert(start, 'Date').valueOf() : null;
|
|
var _end = end != undefined ? util.convert(end, 'Date').valueOf() : null;
|
|
this._cancelAnimation();
|
|
|
|
if (animate) {
|
|
var me = this;
|
|
var initStart = this.start;
|
|
var initEnd = this.end;
|
|
var duration = typeof animate === 'number' ? animate : 500;
|
|
var initTime = new Date().valueOf();
|
|
var anyChanged = false;
|
|
|
|
function next() {
|
|
if (!me.props.touch.dragging) {
|
|
var now = new Date().valueOf();
|
|
var time = now - initTime;
|
|
var done = time > duration;
|
|
var s = (done || _start === null) ? _start : util.easeInOutQuad(time, initStart, _start, duration);
|
|
var e = (done || _end === null) ? _end : util.easeInOutQuad(time, initEnd, _end, duration);
|
|
|
|
changed = me._applyRange(s, e);
|
|
DateUtil.updateHiddenDates(me.body, me.options.hiddenDates);
|
|
anyChanged = anyChanged || changed;
|
|
if (changed) {
|
|
me.body.emitter.emit('rangechange', {start: new Date(me.start), end: new Date(me.end)});
|
|
}
|
|
|
|
if (done) {
|
|
if (anyChanged) {
|
|
me.body.emitter.emit('rangechanged', {start: new Date(me.start), end: new Date(me.end)});
|
|
}
|
|
}
|
|
else {
|
|
// animate with as high as possible frame rate, leave 20 ms in between
|
|
// each to prevent the browser from blocking
|
|
me.animateTimer = setTimeout(next, 20);
|
|
}
|
|
}
|
|
}
|
|
|
|
return next();
|
|
}
|
|
else {
|
|
var changed = this._applyRange(_start, _end);
|
|
DateUtil.updateHiddenDates(this.body, this.options.hiddenDates);
|
|
if (changed) {
|
|
var params = {start: new Date(this.start), end: new Date(this.end)};
|
|
this.body.emitter.emit('rangechange', params);
|
|
this.body.emitter.emit('rangechanged', params);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Stop an animation
|
|
* @private
|
|
*/
|
|
Range.prototype._cancelAnimation = function () {
|
|
if (this.animateTimer) {
|
|
clearTimeout(this.animateTimer);
|
|
this.animateTimer = null;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Set a new start and end range. This method is the same as setRange, but
|
|
* does not trigger a range change and range changed event, and it returns
|
|
* true when the range is changed
|
|
* @param {Number} [start]
|
|
* @param {Number} [end]
|
|
* @return {Boolean} changed
|
|
* @private
|
|
*/
|
|
Range.prototype._applyRange = function(start, end) {
|
|
var newStart = (start != null) ? util.convert(start, 'Date').valueOf() : this.start,
|
|
newEnd = (end != null) ? util.convert(end, 'Date').valueOf() : this.end,
|
|
max = (this.options.max != null) ? util.convert(this.options.max, 'Date').valueOf() : null,
|
|
min = (this.options.min != null) ? util.convert(this.options.min, 'Date').valueOf() : null,
|
|
diff;
|
|
|
|
// check for valid number
|
|
if (isNaN(newStart) || newStart === null) {
|
|
throw new Error('Invalid start "' + start + '"');
|
|
}
|
|
if (isNaN(newEnd) || newEnd === null) {
|
|
throw new Error('Invalid end "' + end + '"');
|
|
}
|
|
|
|
// prevent start < end
|
|
if (newEnd < newStart) {
|
|
newEnd = newStart;
|
|
}
|
|
|
|
// prevent start < min
|
|
if (min !== null) {
|
|
if (newStart < min) {
|
|
diff = (min - newStart);
|
|
newStart += diff;
|
|
newEnd += diff;
|
|
|
|
// prevent end > max
|
|
if (max != null) {
|
|
if (newEnd > max) {
|
|
newEnd = max;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// prevent end > max
|
|
if (max !== null) {
|
|
if (newEnd > max) {
|
|
diff = (newEnd - max);
|
|
newStart -= diff;
|
|
newEnd -= diff;
|
|
|
|
// prevent start < min
|
|
if (min != null) {
|
|
if (newStart < min) {
|
|
newStart = min;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// prevent (end-start) < zoomMin
|
|
if (this.options.zoomMin !== null) {
|
|
var zoomMin = parseFloat(this.options.zoomMin);
|
|
if (zoomMin < 0) {
|
|
zoomMin = 0;
|
|
}
|
|
if ((newEnd - newStart) < zoomMin) {
|
|
if ((this.end - this.start) === zoomMin) {
|
|
// ignore this action, we are already zoomed to the minimum
|
|
newStart = this.start;
|
|
newEnd = this.end;
|
|
}
|
|
else {
|
|
// zoom to the minimum
|
|
diff = (zoomMin - (newEnd - newStart));
|
|
newStart -= diff / 2;
|
|
newEnd += diff / 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
// prevent (end-start) > zoomMax
|
|
if (this.options.zoomMax !== null) {
|
|
var zoomMax = parseFloat(this.options.zoomMax);
|
|
if (zoomMax < 0) {
|
|
zoomMax = 0;
|
|
}
|
|
if ((newEnd - newStart) > zoomMax) {
|
|
if ((this.end - this.start) === zoomMax) {
|
|
// ignore this action, we are already zoomed to the maximum
|
|
newStart = this.start;
|
|
newEnd = this.end;
|
|
}
|
|
else {
|
|
// zoom to the maximum
|
|
diff = ((newEnd - newStart) - zoomMax);
|
|
newStart += diff / 2;
|
|
newEnd -= diff / 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
var changed = (this.start != newStart || this.end != newEnd);
|
|
|
|
this.start = newStart;
|
|
this.end = newEnd;
|
|
|
|
return changed;
|
|
};
|
|
|
|
/**
|
|
* Retrieve the current range.
|
|
* @return {Object} An object with start and end properties
|
|
*/
|
|
Range.prototype.getRange = function() {
|
|
return {
|
|
start: this.start,
|
|
end: this.end
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Calculate the conversion offset and scale for current range, based on
|
|
* the provided width
|
|
* @param {Number} width
|
|
* @returns {{offset: number, scale: number}} conversion
|
|
*/
|
|
Range.prototype.conversion = function (width, totalHidden) {
|
|
return Range.conversion(this.start, this.end, width, totalHidden);
|
|
};
|
|
|
|
/**
|
|
* Static method to calculate the conversion offset and scale for a range,
|
|
* based on the provided start, end, and width
|
|
* @param {Number} start
|
|
* @param {Number} end
|
|
* @param {Number} width
|
|
* @returns {{offset: number, scale: number}} conversion
|
|
*/
|
|
Range.conversion = function (start, end, width, totalHidden) {
|
|
if (totalHidden === undefined) {
|
|
totalHidden = 0;
|
|
}
|
|
if (width != 0 && (end - start != 0)) {
|
|
return {
|
|
offset: start,
|
|
scale: width / (end - start - totalHidden)
|
|
}
|
|
}
|
|
else {
|
|
return {
|
|
offset: 0,
|
|
scale: 1
|
|
};
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Start dragging horizontally or vertically
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Range.prototype._onDragStart = function(event) {
|
|
this.deltaDifference = 0;
|
|
this.previousDelta = 0;
|
|
// only allow dragging when configured as movable
|
|
if (!this.options.moveable) return;
|
|
|
|
// refuse to drag when we where pinching to prevent the timeline make a jump
|
|
// when releasing the fingers in opposite order from the touch screen
|
|
if (!this.props.touch.allowDragging) return;
|
|
|
|
this.props.touch.start = this.start;
|
|
this.props.touch.end = this.end;
|
|
this.props.touch.dragging = true;
|
|
|
|
if (this.body.dom.root) {
|
|
this.body.dom.root.style.cursor = 'move';
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Perform dragging operation
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Range.prototype._onDrag = function (event) {
|
|
// only allow dragging when configured as movable
|
|
if (!this.options.moveable) return;
|
|
var direction = this.options.direction;
|
|
validateDirection(direction);
|
|
|
|
// refuse to drag when we where pinching to prevent the timeline make a jump
|
|
// when releasing the fingers in opposite order from the touch screen
|
|
if (!this.props.touch.allowDragging) return;
|
|
|
|
var delta = (direction == 'horizontal') ? event.gesture.deltaX : event.gesture.deltaY;
|
|
delta -= this.deltaDifference;
|
|
var interval = (this.props.touch.end - this.props.touch.start);
|
|
|
|
|
|
// normalize dragging speed if cutout is in between.
|
|
var duration = DateUtil.getHiddenDuration(this.body.hiddenDates, this);
|
|
interval -= duration;
|
|
|
|
|
|
var width = (direction == 'horizontal') ? this.body.domProps.center.width : this.body.domProps.center.height;
|
|
var diffRange = -delta / width * interval;
|
|
var newStart = this.props.touch.start + diffRange;
|
|
var newEnd = this.props.touch.end + diffRange;
|
|
|
|
|
|
// snapping times away from hidden zones
|
|
var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, this.previousDelta-delta, true);
|
|
var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, this.previousDelta-delta, true);
|
|
if (safeStart != newStart || safeEnd != newEnd) {
|
|
this.deltaDifference += delta;
|
|
this.props.touch.start = safeStart;
|
|
this.props.touch.end = safeEnd;
|
|
this._onDrag(event);
|
|
return;
|
|
}
|
|
|
|
this.previousDelta = delta;
|
|
this._applyRange(newStart, newEnd);
|
|
|
|
// fire a rangechange event
|
|
this.body.emitter.emit('rangechange', {
|
|
start: new Date(this.start),
|
|
end: new Date(this.end)
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Stop dragging operation
|
|
* @param {event} event
|
|
* @private
|
|
*/
|
|
Range.prototype._onDragEnd = function (event) {
|
|
// only allow dragging when configured as movable
|
|
if (!this.options.moveable) return;
|
|
|
|
// refuse to drag when we where pinching to prevent the timeline make a jump
|
|
// when releasing the fingers in opposite order from the touch screen
|
|
if (!this.props.touch.allowDragging) return;
|
|
|
|
this.props.touch.dragging = false;
|
|
if (this.body.dom.root) {
|
|
this.body.dom.root.style.cursor = 'auto';
|
|
}
|
|
|
|
// fire a rangechanged event
|
|
this.body.emitter.emit('rangechanged', {
|
|
start: new Date(this.start),
|
|
end: new Date(this.end)
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Event handler for mouse wheel event, used to zoom
|
|
* Code from http://adomas.org/javascript-mouse-wheel/
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Range.prototype._onMouseWheel = function(event) {
|
|
// only allow zooming when configured as zoomable and moveable
|
|
if (!(this.options.zoomable && this.options.moveable)) return;
|
|
|
|
// retrieve delta
|
|
var delta = 0;
|
|
if (event.wheelDelta) { /* IE/Opera. */
|
|
delta = event.wheelDelta / 120;
|
|
} else if (event.detail) { /* Mozilla case. */
|
|
// In Mozilla, sign of delta is different than in IE.
|
|
// Also, delta is multiple of 3.
|
|
delta = -event.detail / 3;
|
|
}
|
|
|
|
// If delta is nonzero, handle it.
|
|
// Basically, delta is now positive if wheel was scrolled up,
|
|
// and negative, if wheel was scrolled down.
|
|
if (delta) {
|
|
// perform the zoom action. Delta is normally 1 or -1
|
|
|
|
// adjust a negative delta such that zooming in with delta 0.1
|
|
// equals zooming out with a delta -0.1
|
|
var scale;
|
|
if (delta < 0) {
|
|
scale = 1 - (delta / 5);
|
|
}
|
|
else {
|
|
scale = 1 / (1 + (delta / 5)) ;
|
|
}
|
|
|
|
// calculate center, the date to zoom around
|
|
var gesture = hammerUtil.fakeGesture(this, event),
|
|
pointer = getPointer(gesture.center, this.body.dom.center),
|
|
pointerDate = this._pointerToDate(pointer);
|
|
|
|
this.zoom(scale, pointerDate, delta);
|
|
}
|
|
|
|
// Prevent default actions caused by mouse wheel
|
|
// (else the page and timeline both zoom and scroll)
|
|
event.preventDefault();
|
|
};
|
|
|
|
/**
|
|
* Start of a touch gesture
|
|
* @private
|
|
*/
|
|
Range.prototype._onTouch = function (event) {
|
|
this.props.touch.start = this.start;
|
|
this.props.touch.end = this.end;
|
|
this.props.touch.allowDragging = true;
|
|
this.props.touch.center = null;
|
|
this.scaleOffset = 0;
|
|
this.deltaDifference = 0;
|
|
};
|
|
|
|
/**
|
|
* On start of a hold gesture
|
|
* @private
|
|
*/
|
|
Range.prototype._onHold = function () {
|
|
this.props.touch.allowDragging = false;
|
|
};
|
|
|
|
/**
|
|
* Handle pinch event
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Range.prototype._onPinch = function (event) {
|
|
// only allow zooming when configured as zoomable and moveable
|
|
if (!(this.options.zoomable && this.options.moveable)) return;
|
|
|
|
this.props.touch.allowDragging = false;
|
|
|
|
if (event.gesture.touches.length > 1) {
|
|
if (!this.props.touch.center) {
|
|
this.props.touch.center = getPointer(event.gesture.center, this.body.dom.center);
|
|
}
|
|
|
|
var scale = 1 / (event.gesture.scale + this.scaleOffset);
|
|
var center = this._pointerToDate(this.props.touch.center);
|
|
|
|
var hiddenDuration = DateUtil.getHiddenDuration(this.body.hiddenDates, this);
|
|
|
|
// calculate new start and end
|
|
var newStart = center + (this.props.touch.start - center) * scale;
|
|
var newEnd = (center+hiddenDuration) + (this.props.touch.end - (center+hiddenDuration)) * scale;
|
|
|
|
// snapping times away from hidden zones
|
|
this.startToFront = 1 - scale > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
|
|
this.endToFront = scale - 1 > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
|
|
|
|
var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, 1 - scale, false);
|
|
var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, scale - 1, false);
|
|
if (safeStart != newStart || safeEnd != newEnd) {
|
|
this.props.touch.start = safeStart;
|
|
this.props.touch.end = safeEnd;
|
|
this.scaleOffset = 1 - event.gesture.scale;
|
|
newStart = safeStart;
|
|
newEnd = safeEnd;
|
|
}
|
|
|
|
this.setRange(newStart, newEnd);
|
|
|
|
this.startToFront = false; // revert to default
|
|
this.endToFront = true; // revert to default
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Helper function to calculate the center date for zooming
|
|
* @param {{x: Number, y: Number}} pointer
|
|
* @return {number} date
|
|
* @private
|
|
*/
|
|
Range.prototype._pointerToDate = function (pointer) {
|
|
var conversion;
|
|
var direction = this.options.direction;
|
|
|
|
validateDirection(direction);
|
|
|
|
if (direction == 'horizontal') {
|
|
var width = this.body.domProps.center.width;
|
|
var duration = DateUtil.getHiddenDuration(this.body.hiddenDates, this);
|
|
//return DateUtil.toTime(this.body, this, pointer.x, width);
|
|
conversion = this.conversion(width, duration);
|
|
//console.log(new Date(pointer.x / conversion.scale + conversion.offset + duration));
|
|
return pointer.x / conversion.scale + conversion.offset;
|
|
}
|
|
else {
|
|
var height = this.body.domProps.center.height;
|
|
conversion = this.conversion(height);
|
|
return pointer.y / conversion.scale + conversion.offset;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Get the pointer location relative to the location of the dom element
|
|
* @param {{pageX: Number, pageY: Number}} touch
|
|
* @param {Element} element HTML DOM element
|
|
* @return {{x: Number, y: Number}} pointer
|
|
* @private
|
|
*/
|
|
function getPointer (touch, element) {
|
|
return {
|
|
x: touch.pageX - util.getAbsoluteLeft(element),
|
|
y: touch.pageY - util.getAbsoluteTop(element)
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Zoom the range the given scale in or out. Start and end date will
|
|
* be adjusted, and the timeline will be redrawn. You can optionally give a
|
|
* date around which to zoom.
|
|
* For example, try scale = 0.9 or 1.1
|
|
* @param {Number} scale Scaling factor. Values above 1 will zoom out,
|
|
* values below 1 will zoom in.
|
|
* @param {Number} [center] Value representing a date around which will
|
|
* be zoomed.
|
|
*/
|
|
Range.prototype.zoom = function(scale, center, delta) {
|
|
// if centerDate is not provided, take it half between start Date and end Date
|
|
if (center == null) {
|
|
center = (this.start + this.end) / 2;
|
|
}
|
|
|
|
var hiddenDuration = DateUtil.getHiddenDuration(this.body.hiddenDates, this);
|
|
|
|
// calculate new start and end
|
|
var newStart = center + (this.start - center) * scale;
|
|
var newEnd = (center+hiddenDuration) + (this.end - (center+hiddenDuration)) * scale;
|
|
|
|
// snapping times away from hidden zones
|
|
this.startToFront = delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
|
|
this.endToFront = -delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
|
|
var safeStart = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newStart, delta, true);
|
|
var safeEnd = DateUtil.snapAwayFromHidden(this.body.hiddenDates, newEnd, -delta, true);
|
|
if (safeStart != newStart || safeEnd != newEnd) {
|
|
newStart = safeStart;
|
|
newEnd = safeEnd;
|
|
}
|
|
|
|
this.setRange(newStart, newEnd);
|
|
|
|
this.startToFront = false; // revert to default
|
|
this.endToFront = true; // revert to default
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Move the range with a given delta to the left or right. Start and end
|
|
* value will be adjusted. For example, try delta = 0.1 or -0.1
|
|
* @param {Number} delta Moving amount. Positive value will move right,
|
|
* negative value will move left
|
|
*/
|
|
Range.prototype.move = function(delta) {
|
|
// zoom start Date and end Date relative to the centerDate
|
|
var diff = (this.end - this.start);
|
|
|
|
// apply new values
|
|
var newStart = this.start + diff * delta;
|
|
var newEnd = this.end + diff * delta;
|
|
|
|
// TODO: reckon with min and max range
|
|
|
|
this.start = newStart;
|
|
this.end = newEnd;
|
|
};
|
|
|
|
/**
|
|
* Move the range to a new center point
|
|
* @param {Number} moveTo New center point of the range
|
|
*/
|
|
Range.prototype.moveTo = function(moveTo) {
|
|
var center = (this.start + this.end) / 2;
|
|
|
|
var diff = center - moveTo;
|
|
|
|
// calculate new start and end
|
|
var newStart = this.start - diff;
|
|
var newEnd = this.end - diff;
|
|
|
|
this.setRange(newStart, newEnd);
|
|
};
|
|
|
|
module.exports = Range;
|