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import { action, computed, trace, observable, runInAction } from "mobx";
import { observer } from "mobx-react";
import { Utils } from "../../Utils";
import { Transform } from "../util/Transform";
import "./InkingCanvas.scss";
import { InkingControl } from "./InkingControl";
import { InkingStroke } from "./InkingStroke";
import React = require("react");
import { undoBatch, UndoManager } from "../util/UndoManager";
import { StrokeData, InkField, InkTool } from "../../new_fields/InkField";
import { Doc } from "../../new_fields/Doc";
import { Cast, PromiseValue, NumCast } from "../../new_fields/Types";
interface InkCanvasProps {
getScreenTransform: () => Transform;
AnnotationDocument: Doc;
Document: Doc;
inkFieldKey: string;
children: () => JSX.Element[];
}
@observer
export class InkingCanvas extends React.Component<InkCanvasProps> {
maxCanvasDim = 8192 / 2; // 1/2 of the maximum canvas dimension for Chrome
@observable inkMidX: number = 0;
@observable inkMidY: number = 0;
private previousState?: Map<string, StrokeData>;
private _currentStrokeId: string = "";
public static IntersectStrokeRect(stroke: StrokeData, selRect: { left: number, top: number, width: number, height: number }): boolean {
return stroke.pathData.reduce((inside: boolean, val) => inside ||
(selRect.left < val.x && selRect.left + selRect.width > val.x &&
selRect.top < val.y && selRect.top + selRect.height > val.y)
, false);
}
public static StrokeRect(stroke: StrokeData): { left: number, top: number, right: number, bottom: number } {
return stroke.pathData.reduce((bounds: { left: number, top: number, right: number, bottom: number }, val) =>
({
left: Math.min(bounds.left, val.x), top: Math.min(bounds.top, val.y),
right: Math.max(bounds.right, val.x), bottom: Math.max(bounds.bottom, val.y)
})
, { left: Number.MAX_VALUE, top: Number.MAX_VALUE, right: -Number.MAX_VALUE, bottom: -Number.MAX_VALUE });
}
componentDidMount() {
PromiseValue(Cast(this.props.AnnotationDocument[this.props.inkFieldKey], InkField)).then(ink => runInAction(() => {
if (ink) {
let bounds = Array.from(ink.inkData).reduce(([mix, max, miy, may], [id, strokeData]) =>
strokeData.pathData.reduce(([mix, max, miy, may], p) =>
[Math.min(mix, p.x), Math.max(max, p.x), Math.min(miy, p.y), Math.max(may, p.y)],
[mix, max, miy, may]),
[Number.MAX_VALUE, Number.MIN_VALUE, Number.MAX_VALUE, Number.MIN_VALUE]);
this.inkMidX = (bounds[0] + bounds[1]) / 2;
this.inkMidY = (bounds[2] + bounds[3]) / 2;
}
}));
}
@computed
get inkData(): Map<string, StrokeData> {
let map = Cast(this.props.AnnotationDocument[this.props.inkFieldKey], InkField);
return !map ? new Map : new Map(map.inkData);
}
set inkData(value: Map<string, StrokeData>) {
this.props.AnnotationDocument[this.props.inkFieldKey] = new InkField(value);
}
@action
onPointerDown = (e: React.PointerEvent): void => {
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();
e.preventDefault();
this.previousState = new Map(this.inkData);
if (InkingControl.Instance.selectedTool !== InkTool.Eraser) {
// start the new line, saves a uuid to represent the field of the stroke
this._currentStrokeId = Utils.GenerateGuid();
const data = this.inkData;
data.set(this._currentStrokeId, {
pathData: [this.relativeCoordinatesForEvent(e.clientX, e.clientY)],
color: InkingControl.Instance.selectedColor,
width: InkingControl.Instance.selectedWidth,
tool: InkingControl.Instance.selectedTool,
page: NumCast(this.props.Document.curPage, -1)
});
this.inkData = data;
}
}
@action
onPointerUp = (e: PointerEvent): void => {
document.removeEventListener("pointermove", this.onPointerMove, true);
document.removeEventListener("pointerup", this.onPointerUp, true);
let coord = this.relativeCoordinatesForEvent(e.clientX, e.clientY);
if (Math.abs(coord.x - this.inkMidX) > 500 || Math.abs(coord.y - this.inkMidY) > 500) {
this.inkMidX = coord.x;
this.inkMidY = coord.y;
}
e.stopPropagation();
e.preventDefault();
const batch = UndoManager.StartBatch("One ink stroke");
const oldState = this.previousState || new Map;
this.previousState = undefined;
const newState = new Map(this.inkData);
UndoManager.AddEvent({
undo: () => this.inkData = oldState,
redo: () => this.inkData = newState
});
batch.end();
}
@action
onPointerMove = (e: PointerEvent): void => {
e.stopPropagation();
e.preventDefault();
if (InkingControl.Instance.selectedTool !== InkTool.Eraser) {
let data = this.inkData; // add points to new line as it is being drawn
let strokeData = data.get(this._currentStrokeId);
if (strokeData) {
strokeData.pathData.push(this.relativeCoordinatesForEvent(e.clientX, e.clientY));
data.set(this._currentStrokeId, strokeData);
}
this.inkData = data;
}
}
relativeCoordinatesForEvent = (ex: number, ey: number): { x: number, y: number } => {
let [x, y] = this.props.getScreenTransform().transformPoint(ex, ey);
return { x, y };
}
@action
removeLine = (id: string): void => {
if (!this.previousState) {
this.previousState = new Map(this.inkData);
document.addEventListener("pointermove", this.onPointerMove, true);
document.addEventListener("pointerup", this.onPointerUp, true);
}
let data = this.inkData;
data.delete(id);
this.inkData = data;
}
@computed
get drawnPaths() {
let curPage = NumCast(this.props.Document.curPage, -1);
let paths = Array.from(this.inkData).reduce((paths, [id, strokeData]) => {
if (strokeData.page === -1 || Math.round(strokeData.page) === Math.round(curPage)) {
paths.push(<InkingStroke key={id} id={id}
line={strokeData.pathData}
count={strokeData.pathData.length}
offsetX={this.maxCanvasDim - this.inkMidX}
offsetY={this.maxCanvasDim - this.inkMidY}
color={strokeData.color}
width={strokeData.width}
tool={strokeData.tool}
deleteCallback={this.removeLine} />);
}
return paths;
}, [] as JSX.Element[]);
return [<svg className={`inkingCanvas-paths-ink`} key="Pens"
style={{ left: `${this.inkMidX - this.maxCanvasDim}px`, top: `${this.inkMidY - this.maxCanvasDim}px` }} >
{paths.filter(path => path.props.tool !== InkTool.Highlighter)}
</svg>,
<svg className={`inkingCanvas-paths-markers`} key="Markers"
style={{ left: `${this.inkMidX - this.maxCanvasDim}px`, top: `${this.inkMidY - this.maxCanvasDim}px` }}>
{paths.filter(path => path.props.tool === InkTool.Highlighter)}
</svg>];
}
render() {
let svgCanvasStyle = InkingControl.Instance.selectedTool !== InkTool.None ? "canSelect" : "noSelect";
return (
<div className="inkingCanvas" >
<div className={`inkingCanvas-${svgCanvasStyle}`} onPointerDown={this.onPointerDown} />
{this.props.children()}
{this.drawnPaths}
</div >
);
}
}
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