edges.ts

/*
Copyright 2021 Bonitasoft S.A.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import type { mxAbstractCanvas2D, mxPoint } from 'mxgraph';

import { mxConnector, mxSvgCanvas2D, mxUtils } from '../initializer';
import { BpmnStyleIdentifier } from '../style';

export class BpmnConnector extends mxConnector {
  override paintEdgeShape(c: mxAbstractCanvas2D, pts: mxPoint[]): void {
    // The indirection via functions for markers is needed in
    // order to apply the offsets before painting the line and
    // paint the markers after painting the line.
    const sourceMarker = this.createMarker(c, pts, true);
    const targetMarker = this.createMarker(c, pts, false);

    this.paintEdgeLine(c, pts);

    // Disables shadows, dashed styles
    c.setShadow(false);
    c.setDashed(false, false);

    if (sourceMarker != null) {
      c.setFillColor(mxUtils.getValue(this.style, BpmnStyleIdentifier.EDGE_START_FILL_COLOR, this.stroke));
      sourceMarker();
    }

    if (targetMarker != null) {
      c.setFillColor(mxUtils.getValue(this.style, BpmnStyleIdentifier.EDGE_END_FILL_COLOR, this.stroke));
      targetMarker();
    }
  }

  // taken from mxPolyline, required as we cannot call mxPolyline method here (parent of the parent)
  // we only support non STYLE_CURVED here (is possible with parent class)
  private paintEdgeLine(c: mxAbstractCanvas2D, pts: mxPoint[]): void {
    const previous = getPointerEventsValue(c);
    setPointerEventsValue(c, 'stroke');
    this.paintLine(c, pts, this.isRounded);
    setPointerEventsValue(c, previous);
  }
}

function getPointerEventsValue(c: mxAbstractCanvas2D): string {
  return c instanceof mxSvgCanvas2D ? c.pointerEventsValue : null;
}

function setPointerEventsValue(c: mxAbstractCanvas2D, value: string): void {
  if (c instanceof mxSvgCanvas2D) {
    c.pointerEventsValue = value;
  }
}