128 lines
3.7 KiB
JavaScript
128 lines
3.7 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2019 The noVNC Authors
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* Licensed under MPL 2.0 or any later version (see LICENSE.txt)
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*/
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import * as Log from '../util/logging.js';
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import { setCapture, stopEvent, getPointerEvent } from '../util/events.js';
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export default class Mouse {
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constructor(target) {
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this._target = target || document;
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this._pos = null;
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this._eventHandlers = {
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'mousedown': this._handleMouseDown.bind(this),
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'mouseup': this._handleMouseUp.bind(this),
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'mousemove': this._handleMouseMove.bind(this),
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'mousedisable': this._handleMouseDisable.bind(this)
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};
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// ===== EVENT HANDLERS =====
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this.onmousebutton = () => {}; // Handler for mouse button press/release
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this.onmousemove = () => {}; // Handler for mouse movement
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}
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// ===== PRIVATE METHODS =====
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_resetDoubleClickTimer() {
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this._doubleClickTimer = null;
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}
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_handleMouseButton(e, down) {
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this._updateMousePosition(e);
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let pos = this._pos;
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let bmask = 1 << e.button;
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Log.Debug("onmousebutton " + (down ? "down" : "up") +
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", x: " + pos.x + ", y: " + pos.y + ", bmask: " + bmask);
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this.onmousebutton(pos.x, pos.y, down, bmask);
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stopEvent(e);
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}
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_handleMouseDown(e) {
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setCapture(this._target);
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this._handleMouseButton(e, 1);
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}
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_handleMouseUp(e) {
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this._handleMouseButton(e, 0);
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}
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_handleMouseMove(e) {
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this._updateMousePosition(e);
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this.onmousemove(this._pos.x, this._pos.y);
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stopEvent(e);
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}
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_handleMouseDisable(e) {
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/*
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* Stop propagation if inside canvas area
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* Note: This is only needed for the 'click' event as it fails
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* to fire properly for the target element so we have
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* to listen on the document element instead.
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*/
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if (e.target == this._target) {
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stopEvent(e);
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}
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}
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// Update coordinates relative to target
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_updateMousePosition(e) {
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e = getPointerEvent(e);
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const bounds = this._target.getBoundingClientRect();
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let x;
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let y;
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// Clip to target bounds
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if (e.clientX < bounds.left) {
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x = 0;
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} else if (e.clientX >= bounds.right) {
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x = bounds.width - 1;
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} else {
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x = e.clientX - bounds.left;
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}
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if (e.clientY < bounds.top) {
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y = 0;
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} else if (e.clientY >= bounds.bottom) {
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y = bounds.height - 1;
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} else {
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y = e.clientY - bounds.top;
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}
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this._pos = {x: x, y: y};
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}
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// ===== PUBLIC METHODS =====
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grab() {
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const t = this._target;
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t.addEventListener('mousedown', this._eventHandlers.mousedown);
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t.addEventListener('mouseup', this._eventHandlers.mouseup);
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t.addEventListener('mousemove', this._eventHandlers.mousemove);
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// Prevent middle-click pasting (see above for why we bind to document)
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document.addEventListener('click', this._eventHandlers.mousedisable);
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// preventDefault() on mousedown doesn't stop this event for some
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// reason so we have to explicitly block it
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t.addEventListener('contextmenu', this._eventHandlers.mousedisable);
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}
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ungrab() {
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const t = this._target;
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t.removeEventListener('mousedown', this._eventHandlers.mousedown);
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t.removeEventListener('mouseup', this._eventHandlers.mouseup);
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t.removeEventListener('mousemove', this._eventHandlers.mousemove);
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document.removeEventListener('click', this._eventHandlers.mousedisable);
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t.removeEventListener('contextmenu', this._eventHandlers.mousedisable);
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}
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}
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