feat: place back blocks when canceling selection and create history entry

src/components/canvas/Canvas.tsx

@@ -41,7 +41,7 @@ PIXI.settings.SCALE_MODE = PIXI.SCALE_MODES.NEAREST;
 function Canvas() {
 	const { stageSize, canvasSize, blocks, coords, scale, version, setStageSize, setBlocks, setCoords, setScale } = useContext(CanvasContext);
 	const { addHistory, undo, redo } = useContext(HistoryContext);
-	const { selectionCoords, selectionLayerBlocks, setSelectionCoords, setSelectionLayerBlocks, confirmSelection } = useContext(SelectionContext);
+	const { selectionCoords, selectionLayerBlocks, setSelectionCoords, setSelectionLayerBlocks } = useContext(SelectionContext);
 	const { settings } = useContext(SettingsContext);
 	const { missingTexture } = useContext(TexturesContext);
 	const { isDark } = useContext(ThemeContext);
@@ -245,11 +245,23 @@ function Canvas() {
 		async (e: React.KeyboardEvent) => {
 			switch (e.key) {
 				case "Escape":
+					setBlocks(startBlocksRef.current);
 					setSelectionLayerBlocks([]);
 					break;
-				case "Enter":
-					confirmSelection();
+				case "Enter": {
+					const combinedBlocks = [...blocks, ...selectionLayerBlocks];
+					const uniqueBlocks = Array.from(new Map(combinedBlocks.map((block) => [`${block.x},${block.y}`, block])).values());
+
+					setBlocks(uniqueBlocks);
+					setSelectionLayerBlocks([]);
+
+					addHistory(
+						"Move Selection",
+						() => setBlocks(uniqueBlocks),
+						() => setBlocks(startBlocksRef.current)
+					);
 					break;
+				}
 				case " ": // Space
 					setDragging(true);
 					oldToolRef.current = tool;
@@ -364,11 +376,11 @@ function Canvas() {
 		},
 		[
 			tool,
-			blocks,
 			selectionCoords,
-			selectionLayerBlocks,
 			canvasSize,
 			blockData,
+			blocks,
+			selectionLayerBlocks,
 			clipboard,
 			setBlocks,
 			setSelectionCoords,
@@ -487,7 +499,7 @@ function Canvas() {
 			<CursorInformation mouseCoords={mouseCoords} />
 			<CanvasInformation />
 
-			<SelectionBar />
+			<SelectionBar startBlocks={startBlocksRef.current} startSelectionCoords={startSelectionCoordsRef.current} />
 		</div>
 	);
 }

src/components/canvas/SelectionBar.tsx

@@ -1,15 +1,52 @@
 import { useContext, useEffect, useState } from "react";
 import { CheckIcon, XIcon } from "lucide-react";
 
+import { HistoryContext } from "@/context/History";
 import { SelectionContext } from "@/context/Selection";
 
 import { Button } from "@/components/ui/button";
+import { CanvasContext } from "@/context/Canvas";
 
-function SelectionBar() {
-	const { selectionLayerBlocks, setSelectionLayerBlocks, confirmSelection } = useContext(SelectionContext);
+interface Props {
+	startBlocks: Block[];
+	startSelectionCoords: CoordinateArray;
+}
+
+function SelectionBar({ startBlocks, startSelectionCoords }: Props) {
+	const { blocks, setBlocks } = useContext(CanvasContext);
+	const { addHistory } = useContext(HistoryContext);
+	const { selectionCoords, selectionLayerBlocks, setSelectionCoords, setSelectionLayerBlocks } = useContext(SelectionContext);
 
 	const [isVisible, setIsVisible] = useState(false);
 
+	const confirm = () => {
+		const oldSelectionCoords = [...selectionCoords];
+
+		const combinedBlocks = [...blocks, ...selectionLayerBlocks];
+		const uniqueBlocks = Array.from(new Map(combinedBlocks.map((block) => [`${block.x},${block.y}`, block])).values());
+
+		setBlocks(uniqueBlocks);
+		setSelectionLayerBlocks([]);
+
+		addHistory(
+			"Move Selection",
+			() => {
+				setBlocks(uniqueBlocks);
+				setSelectionCoords(oldSelectionCoords);
+			},
+			() => {
+				setBlocks(startBlocks);
+				setSelectionCoords(startSelectionCoords);
+			}
+		);
+	};
+
+	const cancel = () => {
+		setBlocks(startBlocks);
+		setSelectionLayerBlocks([]);
+		setSelectionCoords(startSelectionCoords);
+	};
+
 	useEffect(() => {
 		setIsVisible(selectionLayerBlocks.length !== 0);
 	}, [selectionLayerBlocks]);
@@ -20,12 +57,11 @@ function SelectionBar() {
 				${isVisible ? "opacity-100 translate-y-0" : "opacity-0 translate-y-6 pointer-events-none"}
 			`}
 		>
-			{/* todo: place back blocks removed */}
-			<Button variant="ghost" className="w-8 h-8" onClick={() => setSelectionLayerBlocks([])}>
+			<Button variant="ghost" className="w-8 h-8" onClick={cancel}>
 				<XIcon />
 			</Button>
 			<span className="mx-2 text-[0.85rem]">Confirm selection?</span>
-			<Button variant="ghost" className="w-8 h-8" onClick={confirmSelection}>
+			<Button variant="ghost" className="w-8 h-8" onClick={confirm}>
 				<CheckIcon />
 			</Button>
 		</div>

src/components/sidebar/History.tsx

@@ -5,6 +5,7 @@ import {
 	FileIcon,
 	ImageIcon,
 	LassoIcon,
+	MoveIcon,
 	PaintBucketIcon,
 	PencilIcon,
 	PresentationIcon,
@@ -24,6 +25,7 @@ const iconMap = {
 	Eraser: EraserIcon,
 	Lasso: LassoIcon,
 	"Magic Wand": WandIcon,
+	"Move Selection": MoveIcon,
 	"New Canvas": PresentationIcon,
 	"Open Image": ImageIcon,
 	"Open Schematic": FileIcon,

src/context/Selection.tsx

@@ -1,5 +1,4 @@
-import { createContext, ReactNode, useContext, useState } from "react";
-import { CanvasContext } from "./Canvas";
+import { createContext, ReactNode, useState } from "react";
 
 interface Context {
 	selectionCoords: CoordinateArray;
@@ -7,7 +6,6 @@ interface Context {
 	setSelectionCoords: React.Dispatch<React.SetStateAction<CoordinateArray>>;
 	setSelectionLayerBlocks: React.Dispatch<React.SetStateAction<Block[]>>;
 	isInSelection: (x: number, y: number) => boolean;
-	confirmSelection: () => void;
 }
 
 interface Props {
@@ -17,8 +15,6 @@ interface Props {
 export const SelectionContext = createContext<Context>({} as Context);
 
 export const SelectionProvider = ({ children }: Props) => {
-	const { blocks, setBlocks } = useContext(CanvasContext);
-
 	const [selectionCoords, setSelectionCoords] = useState<CoordinateArray>([]);
 	const [selectionLayerBlocks, setSelectionLayerBlocks] = useState<Block[]>([]);
 
@@ -29,14 +25,6 @@ export const SelectionProvider = ({ children }: Props) => {
 		return true;
 	};
 
-	const confirmSelection = () => {
-		const combinedBlocks = [...blocks, ...selectionLayerBlocks];
-		const uniqueBlocks = Array.from(new Map(combinedBlocks.map((block) => [`${block.x},${block.y}`, block])).values());
-
-		setBlocks(uniqueBlocks);
-		setSelectionLayerBlocks([]);
-	};
-
 	return (
 		<SelectionContext.Provider
 			value={{
@@ -45,7 +33,6 @@ export const SelectionProvider = ({ children }: Props) => {
 				setSelectionCoords,
 				setSelectionLayerBlocks,
 				isInSelection,
-				confirmSelection,
 			}}
 		>
 			{children}