org.dominokit.domino.ui.menu.direction.MouseBestFitDirection 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 java.util.Objects.isNull;
import static org.dominokit.domino.ui.style.SpacingCss.dui_flex_col_reverse;
import static org.dominokit.domino.ui.utils.Domino.*;
import static org.dominokit.domino.ui.utils.ElementsFactory.elements;
import static org.dominokit.domino.ui.utils.Unit.px;

import elemental2.dom.DOMRect;
import elemental2.dom.Element;
import elemental2.dom.Event;
import elemental2.dom.MouseEvent;
import jsinterop.base.Js;
import org.dominokit.domino.ui.style.Style;

/** Positions the menu on the bottom right of the mouse click location */
public class MouseBestFitDirection implements DropDirection {

  private MouseEvent mouseEvent;

  /** {@inheritDoc} */
  @Override
  public DropDirection init(Event event) {
    this.mouseEvent = Js.uncheckedCast(event);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public void position(Element source, Element target) {
    dui_flex_col_reverse.remove(source);
    if (isNull(mouseEvent)) {
      DropDirection.BEST_MIDDLE_DOWN_UP.position(source, target);
    } else {
      DOMRect sourceRect = source.getBoundingClientRect();
      int innerWidth = window.innerWidth;
      int innerHeight = window.innerHeight;

      double sourceHeight = sourceRect.height;
      double downSpace = innerHeight - mouseEvent.clientY;
      double sourceWidth = sourceRect.width;
      double rightSpace = innerWidth - mouseEvent.clientX;

      if (hasSpaceOnRightSide(sourceWidth, rightSpace)) {
        if (hasSpaceBelow(sourceHeight, downSpace)) {
          positionBottomRight(source, sourceHeight);
        } else {
          positionTopRight(source, sourceHeight);
        }
      } else {
        if (hasSpaceBelow(sourceHeight, downSpace)) {
          positionBottomLeft(source, sourceHeight, sourceWidth);
        } else {
          positionTopLeft(source, sourceHeight, sourceWidth);
        }
      }
      elements
          .elementOf(source)
          .setCssProperty("--dui-menu-drop-min-width", target.getBoundingClientRect().width + "px");
    }
  }

  private void positionBottomRight(Element source, double sourceHeight) {
    double delta = 0;
    double availableSpace = window.innerHeight - mouseEvent.clientY;
    if (availableSpace < sourceHeight) {
      delta = sourceHeight - availableSpace;
    }

    Style.of(source)
        .style
        .setProperty("top", px.of(mouseEvent.clientY - delta + window.pageYOffset));
    Style.of(source).style.setProperty("left", px.of(mouseEvent.clientX + window.pageXOffset));
  }

  private void positionBottomLeft(Element source, double sourceHeight, double sourceWidth) {
    double delta = 0;
    double availableSpace = window.innerHeight - mouseEvent.clientY;
    if (availableSpace < sourceHeight) {
      delta = sourceHeight - availableSpace;
    }
    Style.of(source)
        .style
        .setProperty("top", px.of(mouseEvent.clientY - delta + window.pageYOffset));
    Style.of(source)
        .style
        .setProperty("left", px.of(mouseEvent.clientX - sourceWidth + window.pageXOffset));
  }

  private void positionTopRight(Element source, double sourceHeight) {
    double delta = 0;
    double availableSpace = mouseEvent.clientY;
    if (availableSpace < sourceHeight) {
      delta = sourceHeight - availableSpace;
    }
    Style.of(source)
        .style
        .setProperty("top", px.of(mouseEvent.clientY - sourceHeight + delta + window.pageYOffset));
    Style.of(source).style.setProperty("left", px.of(mouseEvent.clientX + window.pageXOffset));
  }

  private void positionTopLeft(Element source, double sourceHeight, double sourceWidth) {
    double delta = 0;
    double availableSpace = mouseEvent.clientY;
    if (availableSpace < sourceHeight) {
      delta = sourceHeight - availableSpace;
    }
    Style.of(source)
        .style
        .setProperty("top", px.of(mouseEvent.clientY - sourceHeight + delta + window.pageYOffset));
    Style.of(source)
        .style
        .setProperty("left", px.of(mouseEvent.clientX - sourceWidth + window.pageXOffset));
    dui_dd_best_mouse_fit.apply(source);
  }

  /** {@inheritDoc} */
  @Override
  public void cleanup(Element source) {
    dui_dd_best_mouse_fit.remove(source);
    elements.elementOf(source).removeCssProperty("--dui-menu-drop-min-width");
  }

  private boolean hasSpaceBelow(double sourceHeight, double downSpace) {
    return downSpace > sourceHeight;
  }

  private boolean hasSpaceOnRightSide(double sourceWidth, double rightSpace) {
    return rightSpace > sourceWidth;
  }
}