aboutsummaryrefslogtreecommitdiff
path: root/FrontEnd/src/views/common/ImageCropper.tsx
diff options
context:
space:
mode:
Diffstat (limited to 'FrontEnd/src/views/common/ImageCropper.tsx')
-rw-r--r--FrontEnd/src/views/common/ImageCropper.tsx306
1 files changed, 0 insertions, 306 deletions
diff --git a/FrontEnd/src/views/common/ImageCropper.tsx b/FrontEnd/src/views/common/ImageCropper.tsx
deleted file mode 100644
index 04e17415..00000000
--- a/FrontEnd/src/views/common/ImageCropper.tsx
+++ /dev/null
@@ -1,306 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import { UiLogicError } from "@/common";
-
-import "./ImageCropper.css";
-
-export interface Clip {
- left: number;
- top: number;
- width: number;
-}
-
-interface NormailizedClip extends Clip {
- height: number;
-}
-
-interface ImageInfo {
- width: number;
- height: number;
- landscape: boolean;
- ratio: number;
- maxClipWidth: number;
- maxClipHeight: number;
-}
-
-interface ImageCropperSavedState {
- clip: NormailizedClip;
- x: number;
- y: number;
- pointerId: number;
-}
-
-export interface ImageCropperProps {
- clip: Clip | null;
- imageUrl: string;
- onChange: (clip: Clip) => void;
- imageElementCallback?: (element: HTMLImageElement | null) => void;
- className?: string;
-}
-
-const ImageCropper = (props: ImageCropperProps): React.ReactElement => {
- const { clip, imageUrl, onChange, imageElementCallback, className } = props;
-
- const [oldState, setOldState] = React.useState<ImageCropperSavedState | null>(
- null
- );
- const [imageInfo, setImageInfo] = React.useState<ImageInfo | null>(null);
-
- const normalizeClip = (c: Clip | null | undefined): NormailizedClip => {
- if (c == null) {
- return { left: 0, top: 0, width: 0, height: 0 };
- }
-
- return {
- left: c.left || 0,
- top: c.top || 0,
- width: c.width || 0,
- height: imageInfo != null ? (c.width || 0) / imageInfo.ratio : 0,
- };
- };
-
- const c = normalizeClip(clip);
-
- const imgElementRef = React.useRef<HTMLImageElement | null>(null);
-
- const onImageRef = React.useCallback(
- (e: HTMLImageElement | null) => {
- imgElementRef.current = e;
- if (imageElementCallback != null && e == null) {
- imageElementCallback(null);
- }
- },
- [imageElementCallback]
- );
-
- const onImageLoad = React.useCallback(
- (e: React.SyntheticEvent<HTMLImageElement>) => {
- const img = e.currentTarget;
- const landscape = img.naturalWidth >= img.naturalHeight;
-
- const info = {
- width: img.naturalWidth,
- height: img.naturalHeight,
- landscape,
- ratio: img.naturalHeight / img.naturalWidth,
- maxClipWidth: landscape ? img.naturalHeight / img.naturalWidth : 1,
- maxClipHeight: landscape ? 1 : img.naturalWidth / img.naturalHeight,
- };
- setImageInfo(info);
- onChange({ left: 0, top: 0, width: info.maxClipWidth });
- if (imageElementCallback != null) {
- imageElementCallback(img);
- }
- },
- [onChange, imageElementCallback]
- );
-
- const onPointerDown = React.useCallback(
- (e: React.PointerEvent) => {
- if (oldState != null) return;
- e.currentTarget.setPointerCapture(e.pointerId);
- setOldState({
- x: e.clientX,
- y: e.clientY,
- clip: c,
- pointerId: e.pointerId,
- });
- },
- [oldState, c]
- );
-
- const onPointerUp = React.useCallback(
- (e: React.PointerEvent) => {
- if (oldState == null || oldState.pointerId !== e.pointerId) return;
- e.currentTarget.releasePointerCapture(e.pointerId);
- setOldState(null);
- },
- [oldState]
- );
-
- const onPointerMove = React.useCallback(
- (e: React.PointerEvent) => {
- if (oldState == null) return;
-
- const oldClip = oldState.clip;
-
- const movement = { x: e.clientX - oldState.x, y: e.clientY - oldState.y };
-
- const { current: imgElement } = imgElementRef;
-
- if (imgElement == null) throw new UiLogicError("Image element is null.");
-
- const moveRatio = {
- x: movement.x / imgElement.width,
- y: movement.y / imgElement.height,
- };
-
- const newRatio = {
- x: oldClip.left + moveRatio.x,
- y: oldClip.top + moveRatio.y,
- };
- if (newRatio.x < 0) {
- newRatio.x = 0;
- } else if (newRatio.x > 1 - oldClip.width) {
- newRatio.x = 1 - oldClip.width;
- }
- if (newRatio.y < 0) {
- newRatio.y = 0;
- } else if (newRatio.y > 1 - oldClip.height) {
- newRatio.y = 1 - oldClip.height;
- }
-
- onChange({ left: newRatio.x, top: newRatio.y, width: oldClip.width });
- },
- [oldState, onChange]
- );
-
- const onHandlerPointerMove = React.useCallback(
- (e: React.PointerEvent) => {
- if (oldState == null) return;
-
- const oldClip = oldState.clip;
-
- const movement = { x: e.clientX - oldState.x, y: e.clientY - oldState.y };
-
- const ratio = imageInfo == null ? 1 : imageInfo.ratio;
-
- const { current: imgElement } = imgElementRef;
-
- if (imgElement == null) throw new UiLogicError("Image element is null.");
-
- const moveRatio = {
- x: movement.x / imgElement.width,
- y: movement.x / imgElement.width / ratio,
- };
-
- const newRatio = {
- x: oldClip.width + moveRatio.x,
- y: oldClip.height + moveRatio.y,
- };
-
- const maxRatio = {
- x: Math.min(1 - oldClip.left, newRatio.x),
- y: Math.min(1 - oldClip.top, newRatio.y),
- };
-
- const maxWidthRatio = Math.min(maxRatio.x, maxRatio.y * ratio);
-
- let newWidth;
- if (newRatio.x < 0) {
- newWidth = 0;
- } else if (newRatio.x > maxWidthRatio) {
- newWidth = maxWidthRatio;
- } else {
- newWidth = newRatio.x;
- }
-
- onChange({ left: oldClip.left, top: oldClip.top, width: newWidth });
- },
- [imageInfo, oldState, onChange]
- );
-
- const toPercentage = (n: number): string => `${n}%`;
-
- // fuck!!! I just can't find a better way to implement this in pure css
- const containerStyle: React.CSSProperties = (() => {
- if (imageInfo == null) {
- return { width: "100%", paddingTop: "100%", height: 0 };
- } else {
- if (imageInfo.ratio > 1) {
- return {
- width: toPercentage(100 / imageInfo.ratio),
- paddingTop: "100%",
- height: 0,
- };
- } else {
- return {
- width: "100%",
- paddingTop: toPercentage(100 * imageInfo.ratio),
- height: 0,
- };
- }
- }
- })();
-
- return (
- <div
- className={classnames("image-cropper-container", className)}
- style={containerStyle}
- >
- <img ref={onImageRef} src={imageUrl} onLoad={onImageLoad} alt="to crop" />
- <div className="image-cropper-mask-container">
- <div
- className="image-cropper-mask"
- style={{
- left: toPercentage(c.left * 100),
- top: toPercentage(c.top * 100),
- width: toPercentage(c.width * 100),
- height: toPercentage(c.height * 100),
- }}
- onPointerMove={onPointerMove}
- onPointerDown={onPointerDown}
- onPointerUp={onPointerUp}
- />
- </div>
- <div
- className="image-cropper-handler"
- style={{
- left: `calc(${(c.left + c.width) * 100}% - 15px)`,
- top: `calc(${(c.top + c.height) * 100}% - 15px)`,
- }}
- onPointerMove={onHandlerPointerMove}
- onPointerDown={onPointerDown}
- onPointerUp={onPointerUp}
- />
- </div>
- );
-};
-
-export default ImageCropper;
-
-export function applyClipToImage(
- image: HTMLImageElement,
- clip: Clip,
- mimeType: string
-): Promise<Blob> {
- return new Promise((resolve, reject) => {
- const naturalSize = {
- width: image.naturalWidth,
- height: image.naturalHeight,
- };
- const clipArea = {
- x: naturalSize.width * clip.left,
- y: naturalSize.height * clip.top,
- length: naturalSize.width * clip.width,
- };
-
- const canvas = document.createElement("canvas");
- canvas.width = clipArea.length;
- canvas.height = clipArea.length;
- const context = canvas.getContext("2d");
-
- if (context == null) throw new Error("Failed to create context.");
-
- context.drawImage(
- image,
- clipArea.x,
- clipArea.y,
- clipArea.length,
- clipArea.length,
- 0,
- 0,
- clipArea.length,
- clipArea.length
- );
-
- canvas.toBlob((blob) => {
- if (blob == null) {
- reject(new Error("canvas.toBlob returns null"));
- } else {
- resolve(blob);
- }
- }, mimeType);
- });
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-09-28 11:39:43 +0000