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/**
* Copyright (c) 2017 ZTE Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and the Apache License 2.0 which both accompany this distribution,
* and are available at http://www.eclipse.org/legal/epl-v10.html
* and http://www.apache.org/licenses/LICENSE-2.0
*
* Contributors:
* ZTE - initial API and implementation and/or initial documentation
*/
import { AfterViewInit, Directive, ElementRef } from '@angular/core';
import { JsPlumbService } from "../../services/jsplumb.service";
@Directive({
selector: '[b4tDragSelect]'
})
export class DragSelectDirective implements AfterViewInit {
private selectBox: any;
public selecting = false;
public relatvieX: number;
public relatvieY: number;
public startX: number;
public startY: number;
public endX: number;
public endY: number;
public left: number = 0;
public top: number = 0;
public width: number = 0;
public height: number = 0;
constructor(private el: ElementRef, private jsPlumbService: JsPlumbService) { }
public ngAfterViewInit(): void {
this.selectBox = document.createElement('div');
const selectArea = this.el.nativeElement.appendChild(this.selectBox);
this.el.nativeElement.addEventListener("mousedown", (event: MouseEvent) => this.mouseDown(event));
this.el.nativeElement.addEventListener("mousemove", (event: MouseEvent) => this.mouseMove(event));
this.el.nativeElement.addEventListener("mouseup", (event: MouseEvent) => this.mouseUp(event));
}
public mouseDown(event: MouseEvent) {
this.relatvieX = event.clientX - event.offsetX;
this.relatvieY = event.clientY - event.offsetY;
this.width = 0;
this.height = 0;
this.startX = event.clientX;
this.startY = event.clientY;
this.endX = this.startX;
this.endY = this.startY;
this.selecting = true;
this.updateSelectArea();
}
public mouseMove(event: MouseEvent) {
this.endX = event.clientX;
this.endY = event.clientY;
this.updateSelectArea();
}
public mouseUp(event: MouseEvent) {
this.selecting = false;
this.updateSelectArea();
}
private updateSelectArea() {
if (this.selecting) {
this.selectBox.className = 'selecting';
} else {
this.selectBox.className = '';
return;
}
this.getAllSelectedNodes();
const leftTmp = this.startX >= this.endX ? this.endX : this.startX;
const topTmp = this.startY >= this.endY ? this.endY : this.startY;
this.left = leftTmp - this.relatvieX;
this.top = topTmp - this.relatvieY;
this.width = Math.abs(this.startX - this.endX);
this.height = Math.abs(this.endY - this.startY);
this.selectBox.style.top = this.top + 'px';
this.selectBox.style.left = this.left + 'px';
this.selectBox.style.width = this.width + 'px';
this.selectBox.style.height = this.height + 'px';
}
public getAllSelectedNodes() {
if(!this.selecting) {
return;
}
const selectedNodes = [];
const nodes = this.el.nativeElement.querySelectorAll('div.node');
nodes.forEach(node => {
if(this.checkNodeSelected(node)) {
selectedNodes.push(node);
}
});
this.jsPlumbService.jsplumbInstance.clearDragSelection();
this.jsPlumbService.jsplumbInstance.addToDragSelection(selectedNodes);
}
private checkNodeSelected(node: any): boolean {
const nodeLeft = node.offsetLeft;
const nodeTop = node.offsetTop;
const nodeRigth = nodeLeft + node.clientWidth;
const nodeBottom = nodeTop + node.clientHeight;
const selectedRight = this.left + this.width;
const selectedBottom = this.top + this.height;
return this.between(nodeLeft, this.left, selectedRight)
&& this.between(nodeRigth, this.left, selectedRight)
&& this.between(nodeTop, this.top, selectedBottom)
&& this.between(nodeBottom, this.top, selectedBottom);
}
private between(value, min, max): boolean {
return min <= value && value <= max;
}
}
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