org.dominokit.domino.ui.menu.direction.LeftMiddleDropDirection Maven / Gradle / Ivy

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/*
 * Copyright © 2019 Dominokit
 *
 * 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 org.dominokit.domino.ui.menu.direction;

import static elemental2.dom.DomGlobal.window;
import static org.dominokit.domino.ui.style.Unit.px;

import elemental2.dom.DOMRect;
import elemental2.dom.HTMLElement;

public class LeftMiddleDropDirection implements DropDirection {
  @Override
  public void position(HTMLElement source, HTMLElement target) {
    DOMRect targetRect = target.getBoundingClientRect();
    DOMRect sourceRect = source.getBoundingClientRect();

    double delta = 0;
    double availableBelowSpace = window.innerHeight - targetRect.top;
    if (availableBelowSpace < (sourceRect.height / 2)) {
      delta = ((sourceRect.height / 2) - availableBelowSpace) * -1;
    }

    double availableUpSpace = targetRect.top - window.pageYOffset;
    if (availableUpSpace < (sourceRect.height / 2)) {
      delta = ((sourceRect.height / 2) - availableUpSpace);
    }

    source.style.setProperty(
        "top",
        px.of(
            targetRect.top
                + window.pageYOffset
                - ((sourceRect.height - targetRect.height) / 2)
                + delta));

    source.style.setProperty(
        "left", px.of(targetRect.left + window.pageXOffset - sourceRect.width - 1));
  }
}