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Code Issues Packages Projects Releases Wiki Activity

feat: added undo button while drawing signature (#480)

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This commit is contained in:
18feb06
2023-12-16 07:20:59 +05:00
committed by Mythie
parent de4a0b2560
commit 27b7e29be7
1 changed files with 71 additions and 47 deletions
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118
packages/ui/primitives/signature-pad/signature-pad.tsx
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@ -3,6 +3,7 @@
import type { HTMLAttributes, MouseEvent, PointerEvent, TouchEvent } from 'react';
import { useEffect, useMemo, useRef, useState } from 'react';
import { Undo2 } from 'lucide-react';
import type { StrokeOptions } from 'perfect-freehand';
import { getStroke } from 'perfect-freehand';
@ -27,7 +28,8 @@ export const SignaturePad = ({
const $el = useRef<HTMLCanvasElement>(null);
const [isPressed, setIsPressed] = useState(false);
const [points, setPoints] = useState<Point[]>([]);
const [lines, setLines] = useState<Point[][]>([]);
const [currentLine, setCurrentLine] = useState<Point[]>([]);
const perfectFreehandOptions = useMemo(() => {
const size = $el.current ? Math.min($el.current.height, $el.current.width) * 0.03 : 10;
@ -52,26 +54,7 @@ export const SignaturePad = ({
const point = Point.fromEvent(event, DPI, $el.current);
const newPoints = [...points, point];
setPoints(newPoints);
if ($el.current) {
const ctx = $el.current.getContext('2d');
if (ctx) {
ctx.save();
ctx.imageSmoothingEnabled = true;
ctx.imageSmoothingQuality = 'high';
const pathData = new Path2D(
getSvgPathFromStroke(getStroke(newPoints, perfectFreehandOptions)),
);
ctx.fill(pathData);
}
}
setCurrentLine([point]);
};
const onMouseMove = (event: MouseEvent | PointerEvent | TouchEvent) => {
@ -85,31 +68,36 @@ export const SignaturePad = ({
const point = Point.fromEvent(event, DPI, $el.current);
if (point.distanceTo(points[points.length - 1]) > 5) {
const newPoints = [...points, point];
setPoints(newPoints);
if (point.distanceTo(currentLine[currentLine.length - 1]) > 5) {
setCurrentLine([...currentLine, point]);
// Update the canvas here to draw the lines
if ($el.current) {
const ctx = $el.current.getContext('2d');
if (ctx) {
ctx.restore();
ctx.imageSmoothingEnabled = true;
ctx.imageSmoothingQuality = 'high';
const pathData = new Path2D(
getSvgPathFromStroke(getStroke(points, perfectFreehandOptions)),
);
lines.forEach((line) => {
const pathData = new Path2D(
getSvgPathFromStroke(getStroke(line, perfectFreehandOptions)),
);
ctx.fill(pathData);
});
const pathData = new Path2D(
getSvgPathFromStroke(getStroke([...currentLine, point], perfectFreehandOptions)),
);
ctx.fill(pathData);
}
}
}
};
const onMouseUp = (event: MouseEvent | PointerEvent | TouchEvent, addPoint = true) => {
const onMouseUp = (event: MouseEvent | PointerEvent | TouchEvent, addLine = true) => {
if (event.cancelable) {
event.preventDefault();
}
@ -118,15 +106,16 @@ export const SignaturePad = ({
const point = Point.fromEvent(event, DPI, $el.current);
const newPoints = [...points];
const newLines = [...lines];
if (addPoint) {
newPoints.push(point);
setPoints(newPoints);
if (addLine && currentLine.length > 0) {
newLines.push([...currentLine, point]);
setCurrentLine([]);
}
if ($el.current && newPoints.length > 0) {
setLines(newLines);
if ($el.current && newLines.length > 0) {
const ctx = $el.current.getContext('2d');
if (ctx) {
@ -135,19 +124,18 @@ export const SignaturePad = ({
ctx.imageSmoothingEnabled = true;
ctx.imageSmoothingQuality = 'high';
const pathData = new Path2D(
getSvgPathFromStroke(getStroke(newPoints, perfectFreehandOptions)),
);
newLines.forEach((line) => {
const pathData = new Path2D(
getSvgPathFromStroke(getStroke(line, perfectFreehandOptions)),
);
ctx.fill(pathData);
});
ctx.fill(pathData);
onChange?.($el.current.toDataURL());
ctx.save();
}
onChange?.($el.current.toDataURL());
}
setPoints([]);
};
const onMouseEnter = (event: MouseEvent | PointerEvent | TouchEvent) => {
@ -177,7 +165,29 @@ export const SignaturePad = ({
onChange?.(null);
setPoints([]);
setLines([]);
setCurrentLine([]);
};
const onUndoClick = () => {
if (lines.length === 0) {
return;
}
const newLines = [...lines];
newLines.pop(); // Remove the last line
setLines(newLines);
// Clear the canvas
if ($el.current) {
const ctx = $el.current.getContext('2d');
ctx?.clearRect(0, 0, $el.current.width, $el.current.height);
newLines.forEach((line) => {
const pathData = new Path2D(getSvgPathFromStroke(getStroke(line, perfectFreehandOptions)));
ctx?.fill(pathData);
});
}
};
useEffect(() => {
@ -217,15 +227,29 @@ export const SignaturePad = ({
{...props}
/>
<div className="absolute bottom-4 right-4">
<div className="absolute bottom-4 right-4 flex gap-2">
<button
type="button"
className="focus-visible:ring-ring ring-offset-background text-muted-foreground rounded-full p-0 text-xs focus-visible:outline-none focus-visible:ring-2"
className="focus-visible:ring-ring ring-offset-background text-muted-foreground/60 hover:text-muted-foreground rounded-full p-0 text-xs focus-visible:outline-none focus-visible:ring-2"
onClick={() => onClearClick()}
>
Clear Signature
</button>
</div>
{lines.length > 0 && (
<div className="absolute bottom-4 left-4 flex gap-2">
<button
type="button"
title="undo"
className="focus-visible:ring-ring ring-offset-background text-muted-foreground/60 hover:text-muted-foreground rounded-full p-0 text-xs focus-visible:outline-none focus-visible:ring-2"
onClick={() => onUndoClick()}
>
<Undo2 className="h-4 w-4" />
<span className="sr-only">Undo</span>
</button>
</div>
)}
</div>
);
};