vis.js is a dynamic, browser-based visualization library
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.
 
 
 

534 lines
16 KiB

var util = require('../util');
var hammerUtil = require('../hammerUtil');
var moment = require('../module/moment');
var Component = require('./component/Component');
/**
* @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('days', -3).valueOf(); // Number
this.end = now.clone().add('days', 4).valueOf(); // Number
this.body = body;
// 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: {}
};
// 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'];
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 {Number} [start]
* @param {Number} [end]
*/
Range.prototype.setRange = function(start, end) {
var changed = this._applyRange(start, end);
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);
}
};
/**
* 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) {
return Range.conversion(this.start, this.end, width);
};
/**
* 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) {
if (width != 0 && (end - start != 0)) {
return {
offset: start,
scale: width / (end - start)
}
}
else {
return {
offset: 0,
scale: 1
};
}
};
/**
* Start dragging horizontally or vertically
* @param {Event} event
* @private
*/
Range.prototype._onDragStart = 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.start = this.start;
this.props.touch.end = this.end;
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,
interval = (this.props.touch.end - this.props.touch.start),
width = (direction == 'horizontal') ? this.body.domProps.center.width : this.body.domProps.center.height,
diffRange = -delta / width * interval;
this._applyRange(this.props.touch.start + diffRange, this.props.touch.end + diffRange);
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;
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);
}
// 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;
};
/**
* 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,
initDate = this._pointerToDate(this.props.touch.center);
// calculate new start and end
var newStart = parseInt(initDate + (this.props.touch.start - initDate) * scale);
var newEnd = parseInt(initDate + (this.props.touch.end - initDate) * scale);
// apply new range
this.setRange(newStart, newEnd);
}
};
/**
* 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;
conversion = this.conversion(width);
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) {
// if centerDate is not provided, take it half between start Date and end Date
if (center == null) {
center = (this.start + this.end) / 2;
}
// calculate new start and end
var newStart = center + (this.start - center) * scale;
var newEnd = center + (this.end - center) * scale;
this.setRange(newStart, newEnd);
};
/**
* 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;