react-mosaic-component2/Split.mjs

A React Tiling Window Manager

// src/Split.tsx
import classNames from "classnames";
import { clamp } from "lodash-es";
import { throttle } from "lodash-es";
import React from "react";
import { BoundingBox } from "./util/BoundingBox.mjs";
var RESIZE_THROTTLE_MS = 1e3 / 30;
var TOUCH_EVENT_OPTIONS = {
  capture: true,
  passive: false
};
var Split = class extends React.PureComponent {
  rootElement = React.createRef();
  listenersBound = false;
  static defaultProps = {
    onChange: () => void 0,
    onRelease: () => void 0,
    minimumPaneSizePercentage: 20
  };
  render() {
    const { direction } = this.props;
    return /* @__PURE__ */ React.createElement(
      "div",
      {
        className: classNames("mosaic-split", {
          "-row": direction === "row",
          "-column": direction === "column"
        }),
        ref: this.rootElement,
        onMouseDown: this.onMouseDown,
        style: this.computeStyle()
      },
      /* @__PURE__ */ React.createElement("div", { className: "mosaic-split-line" })
    );
  }
  componentDidMount() {
    this.rootElement.current.addEventListener("touchstart", this.onMouseDown, TOUCH_EVENT_OPTIONS);
  }
  componentWillUnmount() {
    this.unbindListeners();
    if (this.rootElement.current) {
      this.rootElement.current.ownerDocument.removeEventListener("touchstart", this.onMouseDown, TOUCH_EVENT_OPTIONS);
    }
  }
  bindListeners() {
    if (!this.listenersBound) {
      this.rootElement.current.ownerDocument.addEventListener("mousemove", this.onMouseMove, true);
      this.rootElement.current.ownerDocument.addEventListener("touchmove", this.onMouseMove, TOUCH_EVENT_OPTIONS);
      this.rootElement.current.ownerDocument.addEventListener("mouseup", this.onMouseUp, true);
      this.rootElement.current.ownerDocument.addEventListener("touchend", this.onMouseUp, true);
      this.listenersBound = true;
    }
  }
  unbindListeners() {
    if (this.rootElement.current) {
      this.rootElement.current.ownerDocument.removeEventListener("mousemove", this.onMouseMove, true);
      this.rootElement.current.ownerDocument.removeEventListener("touchmove", this.onMouseMove, TOUCH_EVENT_OPTIONS);
      this.rootElement.current.ownerDocument.removeEventListener("mouseup", this.onMouseUp, true);
      this.rootElement.current.ownerDocument.removeEventListener("touchend", this.onMouseUp, true);
      this.listenersBound = false;
    }
  }
  computeStyle() {
    const { boundingBox, direction, splitPercentage } = this.props;
    const positionStyle = direction === "column" ? "top" : "left";
    const absolutePercentage = BoundingBox.getAbsoluteSplitPercentage(boundingBox, splitPercentage, direction);
    return {
      ...BoundingBox.asStyles(boundingBox),
      [positionStyle]: `${absolutePercentage}%`
    };
  }
  onMouseDown = (event) => {
    if (!isTouchEvent(event)) {
      if (event.button !== 0) {
        return;
      }
    }
    event.preventDefault();
    this.bindListeners();
  };
  onMouseUp = (event) => {
    this.unbindListeners();
    const percentage = this.calculateRelativePercentage(event);
    this.props.onRelease(percentage);
  };
  onMouseMove = (event) => {
    event.preventDefault();
    this.throttledUpdatePercentage(event);
  };
  throttledUpdatePercentage = throttle((event) => {
    const percentage = this.calculateRelativePercentage(event);
    if (percentage !== this.props.splitPercentage) {
      this.props.onChange(percentage);
    }
  }, RESIZE_THROTTLE_MS);
  calculateRelativePercentage(event) {
    const { minimumPaneSizePercentage, direction, boundingBox } = this.props;
    const parentBBox = this.rootElement.current.parentElement.getBoundingClientRect();
    const location = isTouchEvent(event) ? event.changedTouches[0] : event;
    let absolutePercentage;
    if (direction === "column") {
      absolutePercentage = (location.clientY - parentBBox.top) / parentBBox.height * 100;
    } else {
      absolutePercentage = (location.clientX - parentBBox.left) / parentBBox.width * 100;
    }
    const relativePercentage = BoundingBox.getRelativeSplitPercentage(boundingBox, absolutePercentage, direction);
    return clamp(relativePercentage, minimumPaneSizePercentage, 100 - minimumPaneSizePercentage);
  }
};
function isTouchEvent(event) {
  return event.changedTouches != null;
}
export {
  Split
};