/
core.ts
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/
core.ts
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import { SurveyModel } from "../survey";
import { Base, EventBase } from "../base";
import { IShortcutText, ISurvey, ISurveyElement } from "../base-interfaces";
import { DragTypeOverMeEnum } from "../survey-element";
import { IDragDropEngine } from "./engine";
import { DragDropDOMAdapter, IDragDropDOMAdapter } from "./dom-adapter";
export abstract class DragDropCore<T> implements IDragDropEngine {
private _isBottom: boolean = null;
public get isBottom(): boolean { //TODO rename isBottom to isShowGhostAtBottomOfDropTarget
return !!this._isBottom;
}
public set isBottom(val: boolean) {
this._isBottom = val;
this.ghostPositionChanged();
}
public onGhostPositionChanged: EventBase<{}> = new EventBase<{}>();
protected ghostPositionChanged(): void {
this.onGhostPositionChanged.fire(<any>{}, {});
}
public onDragStart: EventBase<DragDropCore<T>> = new EventBase();
public onDragEnd: EventBase<DragDropCore<T>> = new EventBase();
public onBeforeDrop = this.onDragStart;
public onAfterDrop = this.onDragEnd;
public draggedElement: any = null;
protected abstract get draggedElementType(): string;
protected parentElement: T;
public dropTarget: any = null;
protected get dropTargetDataAttributeName(): string {
return `[data-sv-drop-target-${this.draggedElementType}]`;
}
protected get survey(): SurveyModel {
return this.surveyValue || this.creator?.survey;
}
public prevDropTarget: any = null;
protected allowDropHere = false;
protected domAdapter: IDragDropDOMAdapter;
constructor(private surveyValue?: ISurvey, private creator?: any, longTap?: boolean, domAdapter?: IDragDropDOMAdapter) {
this.domAdapter = domAdapter || new DragDropDOMAdapter(this, longTap, this.survey?.fitToContainer);
}
public startDrag(event: PointerEvent, draggedElement: any, parentElement?: any, draggedElementNode?: HTMLElement, preventSaveTargetNode: boolean = false): void {
this.domAdapter.rootContainer = this.survey?.rootElement;
this.domAdapter.startDrag(event, draggedElement, parentElement, draggedElementNode, preventSaveTargetNode);
}
public dragInit(event: PointerEvent, draggedElement: any, parentElement?: any, draggedElementNode?: HTMLElement): void {
this.draggedElement = draggedElement;
this.parentElement = parentElement;
const shortcutText = this.getShortcutText(this.draggedElement);
this.domAdapter.draggedElementShortcut = this.createDraggedElementShortcut(
shortcutText,
draggedElementNode,
event
);
this.onStartDrag(event);
}
protected onStartDrag(event?: PointerEvent): void {
}
protected isDropTargetDoesntChanged(newIsBottom: boolean): boolean {
return (
this.dropTarget === this.prevDropTarget && newIsBottom === this.isBottom
);
}
protected getShortcutText(draggedElement: IShortcutText): string {
return draggedElement.shortcutText;
}
protected createDraggedElementShortcut(
text: string,
draggedElementNode?: HTMLElement,
event?: PointerEvent
): HTMLElement {
const draggedElementShortcut = document.createElement("div");
draggedElementShortcut.innerText = text;
draggedElementShortcut.className = this.getDraggedElementClass();
return draggedElementShortcut;
}
protected getDraggedElementClass() {
return "sv-dragged-element-shortcut";
}
protected doDragOver(): void { }
protected afterDragOver(dropTargetNode: HTMLElement): void { }
// public getGhostPosition(item: any): string {
// if (this.dropTarget !== item) return null;
// if (this.isBottom) return "bottom";
// return "top";
// }
protected abstract isDropTargetValid(
dropTarget: any,
dropTargetNode?: HTMLElement
): boolean;
protected banDropHere = (): void => {
this.allowDropHere = false;
this.doBanDropHere();
this.dropTarget = null;
this.domAdapter.draggedElementShortcut.style.cursor = "not-allowed";
this.isBottom = null;
};
protected doBanDropHere = (): void => { };
protected findDropTargetNodeFromPoint(clientX: number, clientY: number): HTMLElement {
const displayProp = this.domAdapter.draggedElementShortcut.style.display;
//this.domAdapter.draggedElementShortcut.hidden = true;
this.domAdapter.draggedElementShortcut.style.display = "none";
let dragOverNode = <HTMLElement>document.elementFromPoint(clientX, clientY);
// this.domAdapter.draggedElementShortcut.hidden = false;
this.domAdapter.draggedElementShortcut.style.display = displayProp || "block";
if (!dragOverNode) return null;
return this.findDropTargetNodeByDragOverNode(dragOverNode);
}
protected getDataAttributeValueByNode(node: HTMLElement) {
let datasetName = "svDropTarget";
const words = this.draggedElementType.split("-");
words.forEach((word) => {
datasetName += this.capitalizeFirstLetter(word);
});
return node.dataset[datasetName];
}
protected getDropTargetByNode(
dropTargetNode: HTMLElement,
event: PointerEvent
): any {
let dataAttributeValue = this.getDataAttributeValueByNode(dropTargetNode);
return this.getDropTargetByDataAttributeValue(
dataAttributeValue,
dropTargetNode,
event
);
}
private capitalizeFirstLetter(string: string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}
//TODO adandone unrequired params (survey-elements)
protected abstract getDropTargetByDataAttributeValue(
dataAttributeValue: string,
dropTargetNode?: HTMLElement,
event?: PointerEvent
): any;
protected calculateVerticalMiddleOfHTMLElement(HTMLElement: HTMLElement): number {
const rect = HTMLElement.getBoundingClientRect();
return rect.y + rect.height / 2;
}
protected calculateHorizontalMiddleOfHTMLElement(HTMLElement: HTMLElement): number {
const rect = HTMLElement.getBoundingClientRect();
return rect.x + rect.width / 2;
}
protected calculateIsBottom(clientY: number, dropTargetNode?: HTMLElement): boolean {
return false;
}
protected findDropTargetNodeByDragOverNode(dragOverNode: HTMLElement): HTMLElement {
const dropTargetNode: HTMLElement = dragOverNode.closest(this.dropTargetDataAttributeName);
return dropTargetNode;
}
public dragOver(event: PointerEvent): void {
const dropTargetNode = this.findDropTargetNodeFromPoint(
event.clientX,
event.clientY
);
if (!dropTargetNode) {
this.banDropHere();
return;
}
this.dropTarget = this.getDropTargetByNode(dropTargetNode, event);
const isDropTargetValid = this.isDropTargetValid(
this.dropTarget,
dropTargetNode
);
this.doDragOver();
if (!isDropTargetValid) {
this.banDropHere();
return;
}
let isBottom = this.calculateIsBottom(event.clientY, dropTargetNode);
this.allowDropHere = true;
if (this.isDropTargetDoesntChanged(isBottom)) return;
this.isBottom = null; //TODO need for property change trigger with guarantee but it would be better not to watch on isBottom property but have some event like onValidTargetDragOver
this.isBottom = isBottom;
this.afterDragOver(dropTargetNode);
this.prevDropTarget = this.dropTarget;
}
protected abstract doDrop(): any;
public drop(): void {
if (this.allowDropHere) {
const fromElement = this.draggedElement.parent;
this.onDragStart.fire(this, { fromElement: fromElement, draggedElement: this.draggedElement });
const newElement = this.doDrop();
this.onDragEnd.fire(this, { fromElement: fromElement, draggedElement: newElement, toElement: this.dropTarget });
}
}
public clear(): void {
this.dropTarget = null;
this.prevDropTarget = null;
this.draggedElement = null;
this.isBottom = null;
this.parentElement = null;
}
}