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import { getDefaultProps, getDefaultSize } from "@/lib/componentDefaults";
import { snapToGrid } from "@/lib/geometry";
import type { CanvasComponent, ComponentType } from "@/types/canvas";
interface Point {
x: number;
y: number;
}
const PALETTE_TO_COMPONENT_TYPE: Record<string, ComponentType> = {
JPanel: "Panel",
JButton: "Button",
JLabel: "Label",
JPasswordField: "PasswordField",
JTextField: "TextField",
JTextArea: "TextArea",
JCheckBox: "CheckBox",
JRadioButton: "RadioButton",
JComboBox: "ComboBox",
JList: "List",
JProgressBar: "ProgressBar",
JSlider: "Slider",
JSpinner: "Spinner",
JSeparator: "Separator",
JMenuBar: "MenuBar",
JMenu: "Menu",
JMenuItem: "MenuItem",
JToolBar: "ToolBar",
};
function toComponentType(rawType: string): ComponentType | null {
return PALETTE_TO_COMPONENT_TYPE[rawType] ?? null;
}
function createComponentId(): string {
return (
globalThis.crypto?.randomUUID?.() ?? `${Date.now()}-${Math.random().toString(16).slice(2)}`
);
}
export interface UseCanvasDragDropOptions {
viewportRef: React.RefObject<HTMLDivElement | null>;
zoom: number;
pan: Point;
components: CanvasComponent[];
onAddComponent: (component: CanvasComponent) => void;
onSelectComponent: (id: string) => void;
resolveComponentType?: (paletteType: string) => ComponentType | null;
createId?: () => string;
}
export interface UseCanvasDragDropResult {
handleDragOver: (event: React.DragEvent<HTMLDivElement>) => void;
handleDrop: (event: React.DragEvent<HTMLDivElement>) => void;
isDragging: boolean;
}
function isPointInsideComponent(component: CanvasComponent, point: Point): boolean {
return (
point.x >= component.x &&
point.x <= component.x + component.width &&
point.y >= component.y &&
point.y <= component.y + component.height
);
}
function resolvePanelDropTarget(
components: CanvasComponent[],
point: Point,
): CanvasComponent | null {
let targetPanel: CanvasComponent | null = null;
let targetArea = Number.POSITIVE_INFINITY;
for (const component of components) {
if (component.type !== "Panel" || !isPointInsideComponent(component, point)) {
continue;
}
const area = component.width * component.height;
if (area <= targetArea) {
targetPanel = component;
targetArea = area;
}
}
return targetPanel;
}
export function useCanvasDragDrop({
viewportRef,
zoom,
pan,
components,
onAddComponent,
onSelectComponent,
resolveComponentType = toComponentType,
createId = createComponentId,
}: UseCanvasDragDropOptions): UseCanvasDragDropResult {
const [isDragging, setIsDragging] = useState(false);
const dragDepthRef = useRef(0);
useEffect(() => {
const viewportElement = viewportRef.current;
if (!viewportElement) {
return;
}
const handleNativeDragEnter = () => {
dragDepthRef.current += 1;
setIsDragging(true);
};
const handleNativeDragLeave = () => {
dragDepthRef.current -= 1;
if (dragDepthRef.current <= 0) {
dragDepthRef.current = 0;
setIsDragging(false);
}
};
const handleNativeDrop = () => {
dragDepthRef.current = 0;
setIsDragging(false);
};
viewportElement.addEventListener("dragenter", handleNativeDragEnter);
viewportElement.addEventListener("dragleave", handleNativeDragLeave);
viewportElement.addEventListener("drop", handleNativeDrop);
return () => {
viewportElement.removeEventListener("dragenter", handleNativeDragEnter);
viewportElement.removeEventListener("dragleave", handleNativeDragLeave);
viewportElement.removeEventListener("drop", handleNativeDrop);
};
}, [viewportRef]);
const handleDragOver = useCallback(
(event: React.DragEvent<HTMLDivElement>) => {
event.preventDefault();
event.dataTransfer.dropEffect = "copy";
if (!isDragging) {
setIsDragging(true);
}
},
[isDragging],
);
const handleDrop = useCallback(
(event: React.DragEvent<HTMLDivElement>) => {
event.preventDefault();
dragDepthRef.current = 0;
setIsDragging(false);
const paletteType =
event.dataTransfer.getData("application/x-swing-component") ||
event.dataTransfer.getData("text/plain");
const componentType = resolveComponentType(paletteType);
if (!componentType || !viewportRef.current) {
return;
}
const viewportRect = viewportRef.current.getBoundingClientRect();
const pointerX = (event.clientX - viewportRect.left - pan.x) / zoom;
const pointerY = (event.clientY - viewportRect.top - pan.y) / zoom;
const size = getDefaultSize(componentType);
const defaultProps = getDefaultProps(componentType);
const dropX = Math.round(snapToGrid(pointerX - size.width / 2));
const dropY = Math.round(snapToGrid(pointerY - size.height / 2));
const targetPanel = resolvePanelDropTarget(components, { x: pointerX, y: pointerY });
const component: CanvasComponent = {
id: createId(),
type: componentType,
variableName: `${componentType.charAt(0).toLowerCase()}${componentType.slice(1)}${components.length + 1}`,
x: dropX,
y: dropY,
width: size.width,
height: size.height,
...defaultProps,
};
if (targetPanel) {
component.parentId = targetPanel.id;
component.parentOffset = {
x: Math.round(snapToGrid(dropX - targetPanel.x)),
y: Math.round(snapToGrid(dropY - targetPanel.y)),
};
}
onAddComponent(component);
onSelectComponent(component.id);
},
[
components,
createId,
onAddComponent,
onSelectComponent,
pan.x,
pan.y,
resolveComponentType,
viewportRef,
zoom,
],
);
return {
handleDragOver,
handleDrop,
isDragging,
};
}
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