@lonli-lokli/react-mosaic-component/lib/Split.mjs

A React Tiling Window Manager

// libs/react-mosaic-component/src/lib/Split.tsx
import classNames from "classnames";
import { clamp, sum } from "lodash-es";
import { throttle } from "lodash-es";
import React from "react";
import {
  boundingBoxAsStyles,
  getAbsoluteSplitPercentage,
  getRelativeSplitPercentage
} 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: 10
    // Updated default
  };
  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
      );
    }
  }
  computeStyle() {
    const { boundingBox, direction, splitPercentages, splitIndex } = this.props;
    const relativeSplitterPosition = sum(
      splitPercentages.slice(0, splitIndex + 1)
    );
    const absolutePercentage = getAbsoluteSplitPercentage(
      boundingBox,
      relativeSplitterPosition,
      direction
    );
    const positionStyle = direction === "column" ? "top" : "left";
    return {
      ...boundingBoxAsStyles(boundingBox),
      [positionStyle]: `${absolutePercentage}%`
    };
  }
  onMouseDown = (event) => {
    if (!isTouchEvent(event) && event.button !== 0) return;
    event.preventDefault();
    this.bindListeners();
  };
  onMouseUp = (event) => {
    this.unbindListeners();
    const newPercentages = this.calculateNewPercentages(event);
    this.props.onRelease(newPercentages);
  };
  onMouseMove = (event) => {
    event.preventDefault();
    this.throttledUpdatePercentage(event);
  };
  throttledUpdatePercentage = throttle(
    (event) => {
      const newPercentages = this.calculateNewPercentages(event);
      this.props.onChange(newPercentages);
    },
    RESIZE_THROTTLE_MS
  );
  calculateNewPercentages(event) {
    const {
      minimumPaneSizePercentage,
      direction,
      boundingBox,
      splitPercentages,
      splitIndex
    } = this.props;
    const parentBBox = this.rootElement.current.parentElement.getBoundingClientRect();
    const location = isTouchEvent(event) ? event.changedTouches[0] : event;
    let mouseAbsolutePercentage;
    if (direction === "column") {
      mouseAbsolutePercentage = (location.clientY - parentBBox.top) / parentBBox.height * 100;
    } else {
      mouseAbsolutePercentage = (location.clientX - parentBBox.left) / parentBBox.width * 100;
    }
    const mouseRelativePercentage = getRelativeSplitPercentage(
      boundingBox,
      mouseAbsolutePercentage,
      direction
    );
    const startPercentage = sum(splitPercentages.slice(0, splitIndex));
    const totalSizeOfPanes = splitPercentages[splitIndex] + splitPercentages[splitIndex + 1];
    let newLeftPaneSize = mouseRelativePercentage - startPercentage;
    newLeftPaneSize = clamp(
      newLeftPaneSize,
      minimumPaneSizePercentage,
      totalSizeOfPanes - minimumPaneSizePercentage
    );
    const newRightPaneSize = totalSizeOfPanes - newLeftPaneSize;
    const newSplitPercentages = [...splitPercentages];
    newSplitPercentages[splitIndex] = newLeftPaneSize;
    newSplitPercentages[splitIndex + 1] = newRightPaneSize;
    return newSplitPercentages;
  }
  // These bindings can remain as they were
  bindListeners() {
    if (!this.listenersBound) {
      const doc = this.rootElement.current.ownerDocument;
      doc.addEventListener("mousemove", this.onMouseMove, true);
      doc.addEventListener("touchmove", this.onMouseMove, TOUCH_EVENT_OPTIONS);
      doc.addEventListener("mouseup", this.onMouseUp, true);
      doc.addEventListener("touchend", this.onMouseUp, true);
      this.listenersBound = true;
    }
  }
  unbindListeners() {
    if (this.listenersBound && this.rootElement.current) {
      const doc = this.rootElement.current.ownerDocument;
      doc.removeEventListener("mousemove", this.onMouseMove, true);
      doc.removeEventListener(
        "touchmove",
        this.onMouseMove,
        TOUCH_EVENT_OPTIONS
      );
      doc.removeEventListener("mouseup", this.onMouseUp, true);
      doc.removeEventListener("touchend", this.onMouseUp, true);
      this.listenersBound = false;
    }
  }
};
function isTouchEvent(event) {
  return event.changedTouches != null;
}
export {
  Split
};