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import { action, computed } from "mobx";
import { observer } from "mobx-react";
import { Document } from "../../fields/Document";
import { FieldWaiting } from "../../fields/Field";
import { InkField, InkTool, StrokeData, StrokeMap } from "../../fields/InkField";
import { KeyStore } from "../../fields/KeyStore";
import { Utils } from "../../Utils";
import { Transform } from "../util/Transform";
import "./InkingCanvas.scss";
import { InkingControl } from "./InkingControl";
import { InkingStroke } from "./InkingStroke";
import React = require("react");
interface InkCanvasProps {
getScreenTransform: () => Transform;
Document: Document;
}
@observer
export class InkingCanvas extends React.Component<InkCanvasProps> {
static InkOffset: number = 50000;
public static IntersectStrokeRect(stroke: StrokeData, selRect: { left: number, top: number, width: number, height: number }): boolean {
let inside = false;
stroke.pathData.map(val => {
if (selRect.left < val.x - InkingCanvas.InkOffset && selRect.left + selRect.width > val.x - InkingCanvas.InkOffset &&
selRect.top < val.y - InkingCanvas.InkOffset && selRect.top + selRect.height > val.y - InkingCanvas.InkOffset)
inside = true;
});
return inside
}
private _isDrawing: boolean = false;
private _idGenerator: string = "";
constructor(props: Readonly<InkCanvasProps>) {
super(props);
}
@computed
get inkData(): StrokeMap {
let map = this.props.Document.GetT(KeyStore.Ink, InkField);
if (!map || map === FieldWaiting) {
return new Map;
}
return new Map(map.Data);
}
set inkData(value: StrokeMap) {
this.props.Document.SetDataOnPrototype(KeyStore.Ink, value, InkField);
}
componentDidMount() {
document.addEventListener("mouseup", this.handleMouseUp);
}
componentWillUnmount() {
document.removeEventListener("mouseup", this.handleMouseUp);
}
@action
onPointerDown = (e: React.PointerEvent): void => {
this._isDrawing = false;
if (e.button != 0 || e.altKey || e.ctrlKey ||
InkingControl.Instance.selectedTool === InkTool.None) {
return;
}
document.addEventListener("pointermove", this.onPointerMove, true);
document.addEventListener("pointerup", this.onPointerUp, true);
e.stopPropagation();
this._isDrawing = true;
if (InkingControl.Instance.selectedTool != InkTool.Eraser) {
const point = this.relativeCoordinatesForEvent(e.clientX, e.clientY);
// start the new line, saves a uuid to represent the field of the stroke
this._idGenerator = Utils.GenerateGuid();
this.inkData.set(this._idGenerator,
{
pathData: [point],
color: InkingControl.Instance.selectedColor,
width: InkingControl.Instance.selectedWidth,
tool: InkingControl.Instance.selectedTool,
page: this.props.Document.GetNumber(KeyStore.CurPage, -1)
});
}
}
onPointerUp = (e: PointerEvent): void => {
if (this._isDrawing) {
document.removeEventListener("pointermove", this.onPointerMove);
document.removeEventListener("pointerup", this.onPointerUp);
this._isDrawing = false;
e.stopPropagation();
}
}
@action
onPointerMove = (e: PointerEvent): void => {
if (this._isDrawing) {
e.stopPropagation()
e.preventDefault();
if (InkingControl.Instance.selectedTool === InkTool.Eraser) {
return
}
const point = this.relativeCoordinatesForEvent(e.clientX, e.clientY);
// add points to new line as it is being drawn
let data = this.inkData;
let strokeData = data.get(this._idGenerator);
if (strokeData) {
strokeData.pathData.push(point);
data.set(this._idGenerator, strokeData);
}
this.inkData = data;
}
}
@action
handleMouseUp = (e: MouseEvent): void => {
this._isDrawing = false;
}
relativeCoordinatesForEvent = (ex: number, ey: number): { x: number, y: number } => {
let [x, y] = this.props.getScreenTransform().transformPoint(ex, ey);
x += InkingCanvas.InkOffset;
y += InkingCanvas.InkOffset;
return { x, y };
}
@action
removeLine = (id: string): void => {
let data = this.inkData;
data.delete(id);
this.inkData = data;
}
render() {
// parse data from server
let curPage = this.props.Document.GetNumber(KeyStore.CurPage, -1)
let paths = Array.from(this.inkData).reduce((paths, [id, strokeData]) => {
if (strokeData.page == -1 || strokeData.page == curPage)
paths.push(<InkingStroke key={id} id={id}
line={strokeData.pathData}
color={strokeData.color}
width={strokeData.width}
tool={strokeData.tool}
deleteCallback={this.removeLine} />)
return paths;
}, [] as JSX.Element[]);
let svgCanvasStyle = InkingControl.Instance.selectedTool == InkTool.None ? "-none" : "";
return (
<div className="inkingCanvas" >
<svg className={`inkingCanvas-paths${svgCanvasStyle}`} onPointerDown={this.onPointerDown} >
{paths}
</svg>
{this.props.children}
</div >
)
}
}
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