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mouse-event.js
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mouse-event.js
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import document from 'global/document';
function nope() {}
export default class MouseEventHandler {
constructor({
vertical = false,
valueListener = nope,
toggleMouseOver = nope
}) {
this._vertical = vertical;
this._valueListener = valueListener;
this._toggleMouseOver = toggleMouseOver;
this._prev = 0;
}
handleMouseDown = (e) => {
document.addEventListener('mouseup', this._mouseup);
document.addEventListener('mousemove', this._mousemove);
this._prev = this._getMousePos(e);
this._toggleMouseOver();
};
_getMousePos(e) {
return this._vertical ? e.clientY : e.pageX;
}
_getTouchPosition(e) {
return this._vertical ? e.touches[0].clientY : e.touches[0].pageX;
}
_getMouseDelta(e) {
// movementX might not be supported in some browser
// https://stackoverflow.com/questions/41774726/mouseevent-movementx-property-apparently-not-supported-in-internet-explorer
const mouseCoord = this._vertical ? e.movementY : e.movementX;
const clientCoord = this._getMousePos(e)
const delta = mouseCoord === 0 ? clientCoord - this._prev : mouseCoord;
return delta;
};
_mouseup = () => {
document.removeEventListener('mouseup', this._mouseup);
document.removeEventListener('mousemove', this._mousemove);
this._toggleMouseOver();
};
_mousemove = e => {
e.preventDefault();
const delta = this._getMouseDelta(e);
this._prev = this._getMousePos(e);
this._valueListener(delta);
};
handleTouchStart = e => {
document.addEventListener('touchend', this._touchend);
document.addEventListener('touchmove', this._touchmove);
this._prev = this._getTouchPosition(e);
this._toggleMouseOver();
};
_touchmove = e => {
const delta = this._getTouchPosition(e) - this._prev;
this._prev = this._getTouchPosition(e);
this.props._valueListener(delta);
};
_touchend = () => {
document.removeEventListener('touchend', this._touchend);
document.removeEventListener('touchmove', this._touchmove);
this._toggleMouseOver();
};
}