317 lines
9.0 KiB
JavaScript
Executable File
317 lines
9.0 KiB
JavaScript
Executable File
import React, { Component } from 'react';
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import PropTypes from 'prop-types';
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import ShapeDrawListener from './shape-draw-listener/component';
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import TextDrawListener from './text-draw-listener/component';
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import PencilDrawListener from './pencil-draw-listener/component';
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import ShapePointerListener from './shape-pointer-listener/component';
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import PencilPointerListener from './pencil-pointer-listener/component';
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import CursorListener from './cursor-listener/component';
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export default class WhiteboardOverlay extends Component {
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// a function to transform a screen point to svg point
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// accepts and returns a point of type SvgPoint and an svg object
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// if unable to get the screen CTM, returns an out
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// of bounds (-1, -1) svg point
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static coordinateTransform(screenPoint, someSvgObject) {
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const CTM = someSvgObject.getScreenCTM();
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if (CTM !== null) {
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return screenPoint.matrixTransform(CTM.inverse());
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}
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const outOfBounds = someSvgObject.createSVGPoint();
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outOfBounds.x = -1;
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outOfBounds.y = -1;
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return outOfBounds;
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}
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// Removes selection from all selected elements
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static unSelect() {
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if (document.selection) {
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document.selection.empty();
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} else {
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window.getSelection().removeAllRanges();
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}
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}
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constructor(props) {
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super(props);
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// current shape id
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this.currentShapeId = undefined;
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// count, used to generate a new shape id
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this.count = 0;
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this.getCurrentShapeId = this.getCurrentShapeId.bind(this);
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this.generateNewShapeId = this.generateNewShapeId.bind(this);
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this.getTransformedSvgPoint = this.getTransformedSvgPoint.bind(this);
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this.checkIfOutOfBounds = this.checkIfOutOfBounds.bind(this);
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this.svgCoordinateToPercentages = this.svgCoordinateToPercentages.bind(this);
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this.normalizeThickness = this.normalizeThickness.bind(this);
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this.normalizeFont = this.normalizeFont.bind(this);
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}
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getCurrentShapeId() {
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return this.currentShapeId;
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}
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// this function receives an event from the mouse event attached to the window
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// it transforms the coordinate to the main svg coordinate system
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getTransformedSvgPoint(clientX, clientY) {
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const {
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getSvgRef,
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} = this.props;
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const svgObject = getSvgRef();
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const svgPoint = svgObject.createSVGPoint();
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svgPoint.x = clientX;
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svgPoint.y = clientY;
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const transformedSvgPoint = WhiteboardOverlay.coordinateTransform(svgPoint, svgObject);
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return transformedSvgPoint;
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}
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// receives an svg coordinate and changes the values to percentages of the slide's width/height
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svgCoordinateToPercentages(svgPoint) {
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const {
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slideWidth,
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slideHeight,
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} = this.props;
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const point = {
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x: (svgPoint.x / slideWidth) * 100,
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y: (svgPoint.y / slideHeight) * 100,
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};
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return point;
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}
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normalizeThickness(thickness) {
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const {
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physicalSlideWidth,
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} = this.props;
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return (thickness * 100) / physicalSlideWidth;
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}
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normalizeFont(fontSize) {
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const {
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physicalSlideHeight,
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} = this.props;
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return (fontSize * 100) / physicalSlideHeight;
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}
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generateNewShapeId() {
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const {
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userId,
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} = this.props;
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this.count = this.count + 1;
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this.currentShapeId = `${userId}-${this.count}-${new Date().getTime()}`;
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return this.currentShapeId;
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}
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// this function receives a transformed svg coordinate and checks if it's not out of bounds
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checkIfOutOfBounds(point) {
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const {
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viewBoxX,
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viewBoxY,
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viewBoxWidth,
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viewBoxHeight,
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} = this.props;
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let { x, y } = point;
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// set this flag to true if either x or y are out of bounds
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let shouldUnselect = false;
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if (x < viewBoxX) {
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x = viewBoxX;
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shouldUnselect = true;
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} else if (x > viewBoxX + viewBoxWidth) {
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x = viewBoxX + viewBoxWidth;
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shouldUnselect = true;
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}
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if (y < viewBoxY) {
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y = viewBoxY;
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shouldUnselect = true;
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} else if (y > viewBoxY + viewBoxHeight) {
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y = viewBoxY + viewBoxHeight;
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shouldUnselect = true;
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}
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// if either x or y are out of bounds - remove selection from potentially selected elements
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if (shouldUnselect) {
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WhiteboardOverlay.unSelect();
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}
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return {
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x,
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y,
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};
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}
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renderDrawListener(actions) {
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const {
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drawSettings,
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userId,
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whiteboardId,
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physicalSlideWidth,
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physicalSlideHeight,
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slideWidth,
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slideHeight,
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} = this.props;
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const { tool } = drawSettings;
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if (tool === 'triangle' || tool === 'rectangle' || tool === 'ellipse' || tool === 'line') {
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if (window.PointerEvent) {
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return (
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<ShapePointerListener
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userId={userId}
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actions={actions}
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drawSettings={drawSettings}
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whiteboardId={whiteboardId}
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/>
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);
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}
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return (
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<ShapeDrawListener
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userId={userId}
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actions={actions}
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drawSettings={drawSettings}
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whiteboardId={whiteboardId}
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/>
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);
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} if (tool === 'pencil') {
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if (window.PointerEvent) {
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return (
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<PencilPointerListener
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userId={userId}
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whiteboardId={whiteboardId}
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drawSettings={drawSettings}
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actions={actions}
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physicalSlideWidth={physicalSlideWidth}
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physicalSlideHeight={physicalSlideHeight}
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/>
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);
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}
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return (
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<PencilDrawListener
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userId={userId}
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whiteboardId={whiteboardId}
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drawSettings={drawSettings}
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actions={actions}
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physicalSlideWidth={physicalSlideWidth}
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physicalSlideHeight={physicalSlideHeight}
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/>
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);
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} if (tool === 'text') {
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return (
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<TextDrawListener
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userId={userId}
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whiteboardId={whiteboardId}
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drawSettings={drawSettings}
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actions={actions}
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slideWidth={slideWidth}
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slideHeight={slideHeight}
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/>
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);
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}
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return (
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<span />
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);
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}
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render() {
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const {
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whiteboardId,
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sendAnnotation,
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resetTextShapeSession,
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setTextShapeActiveId,
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contextMenuHandler,
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clearPreview,
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updateCursor,
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} = this.props;
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const actions = {
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getTransformedSvgPoint: this.getTransformedSvgPoint,
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checkIfOutOfBounds: this.checkIfOutOfBounds,
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svgCoordinateToPercentages: this.svgCoordinateToPercentages,
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getCurrentShapeId: this.getCurrentShapeId,
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generateNewShapeId: this.generateNewShapeId,
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normalizeThickness: this.normalizeThickness,
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normalizeFont: this.normalizeFont,
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sendAnnotation,
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resetTextShapeSession,
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setTextShapeActiveId,
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contextMenuHandler,
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clearPreview,
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};
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return (
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<CursorListener
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whiteboardId={whiteboardId}
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actions={actions}
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updateCursor={updateCursor}
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>
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{this.renderDrawListener(actions)}
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</CursorListener>
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);
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}
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}
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WhiteboardOverlay.propTypes = {
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// Defines a function which returns a reference to the main svg object
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getSvgRef: PropTypes.func.isRequired,
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// Defines the width of the slide (svg coordinate system)
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slideWidth: PropTypes.number.isRequired,
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// Defines the height of the slide (svg coordinate system)
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slideHeight: PropTypes.number.isRequired,
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// Defines the physical width of the slide, needed to calculate thickness, and pencil smoothing
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physicalSlideWidth: PropTypes.number.isRequired,
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// Defines the physical width of the slide, to calculate pencil smoothing
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physicalSlideHeight: PropTypes.number.isRequired,
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// Defines a current user's user id
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userId: PropTypes.string.isRequired,
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// Defines an X coordinate of the viewBox
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viewBoxX: PropTypes.number.isRequired,
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// Defines a Y coordinate of the viewBox
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viewBoxY: PropTypes.number.isRequired,
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// Defines a width of the viewBox
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viewBoxWidth: PropTypes.number.isRequired,
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// Defines a height of the viewBox
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viewBoxHeight: PropTypes.number.isRequired,
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// Defines a handler to publish an annotation to the server
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sendAnnotation: PropTypes.func.isRequired,
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// Defines a handler to clear a shape preview
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clearPreview: PropTypes.func.isRequired,
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// Defines a current whiteboard id
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whiteboardId: PropTypes.string.isRequired,
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// Defines an object containing current settings for drawing
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drawSettings: PropTypes.shape({
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// Annotation color
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color: PropTypes.number.isRequired,
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// Annotation thickness (not normalized)
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thickness: PropTypes.number.isRequired,
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// The name of the tool currently selected
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tool: PropTypes.string,
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// Font size for the text shape
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textFontSize: PropTypes.number.isRequired,
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// Text shape value
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textShapeValue: PropTypes.string.isRequired,
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}).isRequired,
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// Defines a function which resets the current state of the text shape drawing
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resetTextShapeSession: PropTypes.func.isRequired,
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// Defines a function that sets a session value for the current active text shape
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setTextShapeActiveId: PropTypes.func.isRequired,
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// Defines a handler to publish cursor position to the server
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updateCursor: PropTypes.func.isRequired,
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};
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