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import { DocumentDecorations } from "../views/DocumentDecorations";
import { CollectionDockingView } from "../views/collections/CollectionDockingView";
import { Document } from "../../fields/Document"
import { action } from "mobx";
import { DocumentView } from "../views/nodes/DocumentView";
import { ImageField } from "../../fields/ImageField";
import { KeyStore } from "../../fields/KeyStore";
export function setupDrag(_reference: React.RefObject<HTMLDivElement>, docFunc: () => Document) {
let onRowMove = action((e: PointerEvent): void => {
e.stopPropagation();
e.preventDefault();
document.removeEventListener("pointermove", onRowMove);
document.removeEventListener('pointerup', onRowUp);
DragManager.StartDrag(_reference.current!, { document: docFunc() });
});
let onRowUp = action((e: PointerEvent): void => {
document.removeEventListener("pointermove", onRowMove);
document.removeEventListener('pointerup', onRowUp);
});
let onItemDown = (e: React.PointerEvent) => {
// if (this.props.isSelected() || this.props.isTopMost) {
if (e.button == 0) {
e.stopPropagation();
if (e.shiftKey) {
CollectionDockingView.Instance.StartOtherDrag(docFunc(), e);
} else {
document.addEventListener("pointermove", onRowMove);
document.addEventListener('pointerup', onRowUp);
}
}
//}
}
return onItemDown;
}
export namespace DragManager {
export function Root() {
const root = document.getElementById("root");
if (!root) {
throw new Error("No root element found");
}
return root;
}
let dragDiv: HTMLDivElement;
export enum DragButtons {
Left = 1, Right = 2, Both = Left | Right
}
interface DragOptions {
handlers: DragHandlers;
hideSource: boolean | (() => boolean);
}
export interface DragDropDisposer {
(): void;
}
export class DragCompleteEvent {
}
export interface DragHandlers {
dragComplete: (e: DragCompleteEvent) => void;
}
export interface DropOptions {
handlers: DropHandlers;
}
export class DropEvent {
constructor(readonly x: number, readonly y: number, readonly data: { [id: string]: any }) { }
}
export interface DropHandlers {
drop: (e: Event, de: DropEvent) => void;
}
export function MakeDropTarget(element: HTMLElement, options: DropOptions): DragDropDisposer {
if ("canDrop" in element.dataset) {
throw new Error("Element is already droppable, can't make it droppable again");
}
element.dataset["canDrop"] = "true";
const handler = (e: Event) => {
const ce = e as CustomEvent<DropEvent>;
options.handlers.drop(e, ce.detail);
};
element.addEventListener("dashOnDrop", handler);
return () => {
element.removeEventListener("dashOnDrop", handler);
delete element.dataset["canDrop"]
};
}
export function StartDrag(ele: HTMLElement, dragData: { [id: string]: any }, options?: DragOptions) {
DocumentDecorations.Instance.Hidden = true;
if (!dragDiv) {
dragDiv = document.createElement("div");
DragManager.Root().appendChild(dragDiv);
}
const w = ele.offsetWidth, h = ele.offsetHeight;
const rect = ele.getBoundingClientRect();
const scaleX = rect.width / w, scaleY = rect.height / h;
let x = rect.left, y = rect.top;
// const offsetX = e.x - rect.left, offsetY = e.y - rect.top;
let dragElement = ele.cloneNode(true) as HTMLElement;
dragElement.style.opacity = "0.7";
dragElement.style.position = "absolute";
dragElement.style.bottom = "";
dragElement.style.left = "";
dragElement.style.transformOrigin = "0 0";
dragElement.style.zIndex = "1000";
dragElement.style.transform = `translate(${x}px, ${y}px) scale(${scaleX}, ${scaleY})`;
dragElement.style.width = `${rect.width / scaleX}px`;
dragElement.style.height = `${rect.height / scaleY}px`;
// bcz: PDFs don't show up if you clone them because they contain a canvas.
// however, PDF's have a thumbnail field that contains an image of their canvas.
// So we replace the pdf's canvas with the image thumbnail
const docView: DocumentView = dragData["documentView"];
const doc: Document = docView ? docView.props.Document : dragData["document"];
var pdfBox = dragElement.getElementsByClassName("pdfBox-cont")[0] as HTMLElement;
let thumbnail = doc.GetT(KeyStore.Thumbnail, ImageField);
if (pdfBox && pdfBox.childElementCount && thumbnail) {
let img = new Image();
img!.src = thumbnail.toString();
img!.style.position = "absolute";
img!.style.width = `${rect.width / scaleX}px`;
img!.style.height = `${rect.height / scaleY}px`;
pdfBox.replaceChild(img!, pdfBox.children[0])
}
dragDiv.appendChild(dragElement);
let hideSource = false;
if (options) {
if (typeof options.hideSource === "boolean") {
hideSource = options.hideSource;
} else {
hideSource = options.hideSource();
}
}
const wasHidden = ele.hidden;
if (hideSource) {
ele.hidden = true;
}
const moveHandler = (e: PointerEvent) => {
e.stopPropagation();
e.preventDefault();
x += e.movementX;
y += e.movementY;
if (e.shiftKey) {
abortDrag();
CollectionDockingView.Instance.StartOtherDrag(doc, { pageX: e.pageX, pageY: e.pageY, preventDefault: () => { }, button: 0 });
}
dragElement.style.transform = `translate(${x}px, ${y}px) scale(${scaleX}, ${scaleY})`;
};
const abortDrag = () => {
document.removeEventListener("pointermove", moveHandler, true);
document.removeEventListener("pointerup", upHandler);
dragDiv.removeChild(dragElement);
if (hideSource && !wasHidden) {
ele.hidden = false;
}
}
const upHandler = (e: PointerEvent) => {
abortDrag();
FinishDrag(ele, e, dragData, options);
};
document.addEventListener("pointermove", moveHandler, true);
document.addEventListener("pointerup", upHandler);
}
function FinishDrag(dragEle: HTMLElement, e: PointerEvent, dragData: { [index: string]: any }, options?: DragOptions) {
let parent = dragEle.parentElement;
if (parent)
parent.removeChild(dragEle);
const target = document.elementFromPoint(e.x, e.y);
if (parent)
parent.appendChild(dragEle);
if (!target) {
return;
}
target.dispatchEvent(new CustomEvent<DropEvent>("dashOnDrop", {
bubbles: true,
detail: {
x: e.x,
y: e.y,
data: dragData
}
}));
if (options) {
options.handlers.dragComplete({});
}
DocumentDecorations.Instance.Hidden = false;
}
}
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