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Swing based panel to show and interact with mind map

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/*
 * Copyright (C) 2015-2022 Igor A. Maznitsa
 *
 * 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.
 */

package com.igormaznitsa.mindmap.swing.panel.ui;

import com.igormaznitsa.mindmap.model.MindMap;
import com.igormaznitsa.mindmap.model.Topic;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;

public class MouseSelectedArea {

  private final Point startPoint;
  private final Point currentPoint;

  public MouseSelectedArea(final Point point) {
    this.startPoint = new Point(point);
    this.currentPoint = new Point(point);
  }

  public void update(final MouseEvent e) {
    this.currentPoint.setLocation(e.getPoint());
  }

  public Rectangle asRectangle() {
    final int minX = Math.min(this.startPoint.x, this.currentPoint.x);
    final int minY = Math.min(this.startPoint.y, this.currentPoint.y);
    final int maxX = Math.max(this.startPoint.x, this.currentPoint.x);
    final int maxY = Math.max(this.startPoint.y, this.currentPoint.y);
    return new Rectangle(minX, minY, maxX - minX, maxY - minY);
  }

  public List getAllSelectedElements(final MindMap map) {
    final List result = new ArrayList<>();
    final Rectangle rect = asRectangle();
    addCoveredToList(result, map.getRoot(), rect.getBounds2D());
    return result;
  }

  private void addCoveredToList(final List list, final Topic root, final Rectangle2D rect) {
    if (root == null || root.getPayload() == null) {
      return;
    }

    final AbstractElement payload = (AbstractElement) root.getPayload();
    if (rect.contains(payload.getBounds())) {
      list.add(root);
    }
    if (payload instanceof AbstractCollapsableElement && payload.isCollapsed()) {
      return;
    }

    for (final Topic t : root.getChildren()) {
      addCoveredToList(list, t, rect);
    }
  }
}