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| import { assign } from 'min-dash';
import {
toPoint
} from '../../util/Event';
/**
* Initiates canvas scrolling if current cursor point is close to a border.
* Cancelled when current point moves back inside the scrolling borders
* or cancelled manually.
*
* Default options :
* scrollThresholdIn: [ 20, 20, 20, 20 ],
* scrollThresholdOut: [ 0, 0, 0, 0 ],
* scrollRepeatTimeout: 15,
* scrollStep: 10
*
* Threshold order:
* [ left, top, right, bottom ]
*/
export default function AutoScroll(config, eventBus, canvas, mouseTracking) {
this._canvas = canvas;
this._mouseTracking = mouseTracking;
this._opts = assign({
scrollThresholdIn: [ 20, 20, 20, 20 ],
scrollThresholdOut: [ 0, 0, 0, 0 ],
scrollRepeatTimeout: 15,
scrollStep: 10
}, config);
var self = this;
eventBus.on('drag.move', function(e) {
var point = self._toBorderPoint(e);
self.startScroll(point);
});
eventBus.on([ 'drag.cleanup' ], function() {
self.stopScroll();
});
}
AutoScroll.$inject = [
'config.autoScroll',
'eventBus',
'canvas',
'mouseTracking'
];
/**
* Starts scrolling loop.
* Point is given in global scale in canvas container box plane.
*
* @param {Object} point { x: X, y: Y }
*/
AutoScroll.prototype.startScroll = function(point) {
var canvas = this._canvas;
var opts = this._opts;
var self = this;
var clientRect = canvas.getContainer().getBoundingClientRect();
var diff = [
point.x,
point.y,
clientRect.width - point.x,
clientRect.height - point.y
];
this.stopScroll();
var dx = 0,
dy = 0;
for (var i = 0; i < 4; i++) {
if (between(diff[i], opts.scrollThresholdOut[i], opts.scrollThresholdIn[i])) {
if (i === 0) {
dx = opts.scrollStep;
} else if (i == 1) {
dy = opts.scrollStep;
} else if (i == 2) {
dx = -opts.scrollStep;
} else Eif (i == 3) {
dy = -opts.scrollStep;
}
}
}
if (dx !== 0 || dy !== 0) {
canvas.scroll({ dx: dx, dy: dy });
this._scrolling = setTimeout(function() {
self.startScroll(point);
}, opts.scrollRepeatTimeout);
}
};
function between(val, start, end) {
if (start < val && val < end) {
return true;
}
return false;
}
/**
* Stops scrolling loop.
*/
AutoScroll.prototype.stopScroll = function() {
clearTimeout(this._scrolling);
};
/**
* Overrides defaults options.
*
* @param {Object} options
*/
AutoScroll.prototype.setOptions = function(options) {
this._opts = assign({}, this._opts, options);
};
/**
* Converts event to a point in canvas container plane in global scale.
*
* @param {Event} event
* @return {Point}
*/
AutoScroll.prototype._toBorderPoint = function(event) {
var clientRect = this._canvas._container.getBoundingClientRect();
var globalPosition = toPoint(event.originalEvent);
return {
x: globalPosition.x - clientRect.left,
y: globalPosition.y - clientRect.top
};
}; |