Best way to do a split pane in HTML [closed]

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时光说笑

2020-12-04 06:20

Many missed this post from Barguast on Feb 27 '15 where shows a interesting generic flexbox vertical and horizontal resizer.

Take a look: Flexbox Resizing

Barguast note that "... it only handles items sized with flex-grow. If flex-shrink or flex-basis is defined, then the calculations simply don't work.", and he is looking for a better solution, so do I.

Here is his code for reference:

function manageResize(md, sizeProp, posProp)
{
    var r = md.target;

    var prev = r.previousElementSibling;
    var next = r.nextElementSibling;
    if (!prev || !next) {
        return;
    }

    md.preventDefault();

    var prevSize = prev[sizeProp];
    var nextSize = next[sizeProp];
    var sumSize = prevSize + nextSize;
    var prevGrow = Number(prev.style.flexGrow);
    var nextGrow = Number(next.style.flexGrow);
    var sumGrow = prevGrow + nextGrow;
    var lastPos = md[posProp];

    function onMouseMove(mm)
    {
        var pos = mm[posProp];
        var d = pos - lastPos;
        prevSize += d;
        nextSize -= d;
        if (prevSize < 0) {
            nextSize += prevSize;
            pos -= prevSize;
            prevSize = 0;
        }
        if (nextSize < 0) {
            prevSize += nextSize;
            pos += nextSize;
            nextSize = 0;
        }

        var prevGrowNew = sumGrow * (prevSize / sumSize);
        var nextGrowNew = sumGrow * (nextSize / sumSize);

        prev.style.flexGrow = prevGrowNew;
        next.style.flexGrow = nextGrowNew;

        lastPos = pos;
    }

    function onMouseUp(mu)
    {
        window.removeEventListener("mousemove", onMouseMove);
        window.removeEventListener("mouseup", onMouseUp);
    }

    window.addEventListener("mousemove", onMouseMove);
    window.addEventListener("mouseup", onMouseUp);
}

function setupResizerEvents()
{
    document.body.addEventListener("mousedown", function (md) {
        var target = md.target;
        if (target.nodeType !== 1 || target.tagName !== "FLEX-RESIZER") {
            return;
        }
        var parent = target.parentNode;
        var h = parent.classList.contains("h");
        var v = parent.classList.contains("v");
        if (h && v) {
            return;
        } else if (h) {
            manageResize(md, "scrollWidth", "pageX");
        } else if (v) {
            manageResize(md, "scrollHeight", "pageY");
        }
    });
}

setupResizerEvents();

flex {
    display: flex;
}

flex-item > flex {
    position: absolute;
    width: 100%;
    height: 100%;
}

flex.h {
    -ms-flex-direction: row;
    flex-direction: row;
}

flex.v {
    -ms-flex-direction: column;
    flex-direction: column;
}

flex-item {
    display: flex;
    position: relative;
    overflow: hidden;
}

flex > flex-resizer {
    -ms-flex: 0 0 8px;
    flex: 0 0 8px;
    background: white;
}

flex.h > flex-resizer {
    cursor: ew-resize;
}

flex.v > flex-resizer {
    cursor: ns-resize;
}

<body>
    <flex class="v" style="height: 500px">
        <flex-item style="flex: 1; background: red">Flex 1</flex-item>
        <flex-resizer></flex-resizer>
        <flex-item style="flex: 1; background: blue">
            <flex class="h">
                <flex-item style="flex: 1">Flex 2</flex-item>
                <flex-resizer></flex-resizer>
                <flex-item style="flex: 2; background: green">
                    <flex class="v">
                        <flex-item style="flex: 1; background: pink;">Flex 3</flex-item>
                        <flex-resizer></flex-resizer>
                        <flex-item style="flex: 1">
                            <flex class="h">
                                <flex-item style="flex: 1">Flex 4</flex-item>
                                <flex-resizer></flex-resizer>
                                <flex-item style="flex: 2; background: yellow">Flex 5</flex-item>
                                <flex-item style="flex: 2; background: yellow">Flex 6</flex-item>
                            </flex>
                        </flex-item>
                    </flex>
                </flex-item>
            </flex>
        </flex-item>
    </flex>
</body>

And here is my improved version:

function manageResize(md, sizeProp, posProp) {
    var r = md.target;

    var prev = r.previousElementSibling;
    var next = r.nextElementSibling;
    if (!prev || !next) {
        return;
    }

    md.preventDefault();

    var prevSize = prev[sizeProp];
    var nextSize = next[sizeProp];
    var sumSize = prevSize + nextSize;
    var prevGrow = Number(prev.style.flexGrow);
    var nextGrow = Number(next.style.flexGrow);
    var sumGrow = prevGrow + nextGrow;
    var lastPos = md[posProp];

    function onMouseMove(mm) {
        var pos = mm[posProp];
        var d = pos - lastPos;
        prevSize += d;
        nextSize -= d;
        if (prevSize < 0) {
            nextSize += prevSize;
            pos -= prevSize;
            prevSize = 0;
        }
        if (nextSize < 0) {
            prevSize += nextSize;
            pos += nextSize;
            nextSize = 0;
        }

        var prevGrowNew = sumGrow * (prevSize / sumSize);
        var nextGrowNew = sumGrow * (nextSize / sumSize);

        prev.style.flexGrow = prevGrowNew;
        next.style.flexGrow = nextGrowNew;

        lastPos = pos;
    }

    function onMouseUp(mu) {
        // Change cursor to signal a state's change: stop resizing.
        const html = document.querySelector('html');
        html.style.cursor = 'default';

        if (posProp === 'pageX') {
            r.style.cursor = 'ew-resize'; 
        } else {
            r.style.cursor = 'ns-resize';
        }
        
        window.removeEventListener("mousemove", onMouseMove);
        window.removeEventListener("mouseup", onMouseUp);
    }

    window.addEventListener("mousemove", onMouseMove);
    window.addEventListener("mouseup", onMouseUp);
}

function setupResizerEvents() {
    document.body.addEventListener("mousedown", function (md) {

        // Used to avoid cursor's flickering
        const html = document.querySelector('html');
        
        var target = md.target;
        if (target.nodeType !== 1 || target.tagName !== "FLEX-RESIZER") {
            return;
        }
        var parent = target.parentNode;
        var h = parent.classList.contains("h");
        var v = parent.classList.contains("v");
        if (h && v) {
            return;
        } else if (h) {
            // Change cursor to signal a state's change: begin resizing on H.
            target.style.cursor = 'col-resize';
            html.style.cursor = 'col-resize'; // avoid cursor's flickering

            // use offsetWidth versus scrollWidth (and clientWidth) to avoid splitter's jump on resize when a flex-item content overflow (overflow: auto).
            manageResize(md, "offsetWidth", "pageX");
            
        } else if (v) {
            // Change cursor to signal a state's change: begin resizing on V.
            target.style.cursor = 'row-resize';
            html.style.cursor = 'row-resize'; // avoid cursor's flickering

            manageResize(md, "offsetHeight", "pageY");
        }
    });
}

setupResizerEvents();

body {
    /* margin:0; */
    border: 10px solid #aaa;
}

flex {
    display: flex;
    overflow: hidden;
}

/* flex-item > flex {
    position: absolute;
    width: 100%;
    height: 100%;
} */

flex.h {
    flex-direction: row;
}

flex.v {
    flex-direction: column;
}

flex-item {
    /* display: flex; */
    /* position: relative; */
    /* overflow: hidden; */
    overflow: auto;
}

flex > flex-resizer {
    flex: 0 0 10px;
    /* background: white; */
    background-color: #aaa;
    background-repeat: no-repeat;
    background-position: center;
}

flex.h > flex-resizer {
    cursor: ew-resize;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='30'><path d='M2 0 v30 M5 0 v30 M8 0 v30' fill='none' stroke='black'/></svg>");
}

flex.v > flex-resizer {
    cursor: ns-resize;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='10'><path d='M0 2 h30 M0 5 h30 M0 8 h30' fill='none' stroke='black'/></svg>");
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>flex-splitter</title>
    <link rel="stylesheet" href="./src/styles.css">
    <script src="./src/index.js" defer></script>
</head>

<body>
    <flex class="v" style="flex: 1; height: 500px;">
        <flex-item style="flex: 1;">Flex 1</flex-item>
        <flex-resizer></flex-resizer>
        <flex class="h" style="flex: 1;">
            <flex-item style="flex: 1; background-color: aqua;">
      
      <!-- 
        The next section is an example to test the splitter when there is content inside a flex-item
      -->
        <section>
                    <div>
                        <label for="CursorCoor" style="display: block;">showCursorCoor: </label>
                        <textarea id="CursorCoor" rows="6" cols="50" wrap="soft" readonly></textarea>
                    </div>
                
                    <br />
                
                    <div>
                        <label for="boxInfo" style="display: block;">showBoxInfo: </label>
                        <textarea id="boxInfo" rows="6" cols="50" wrap="soft" readonly></textarea>
                    </div>
                </section>
        
      </flex-item>
            <flex-resizer></flex-resizer>
            <flex class="v" style="flex: 2; ">
                <flex-item style="flex: 1; background: pink;">Flex 3</flex-item>
                <flex-resizer></flex-resizer>
                <flex class="h" style="flex: 1">
                    <flex-item style="flex: 1; background: green;">Flex 4</flex-item>
                    <flex-resizer></flex-resizer>
                    <flex-item style="flex: 2;">Flex 5</flex-item>
                    <!-- <flex-resizer></flex-resizer> -->
                    <flex-item style="flex: 3; background: darkorange;">Flex 6</flex-item>
                </flex>
            </flex>
        </flex>
    </flex>
    
</body>
</html>

Or see it on Codesandbox:

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孤独总比滥情好

2020-12-04 06:21

The Angular version with no third-party libraries (based on personal_cloud's answer):

import { Component, Renderer2, ViewChild, ElementRef, AfterViewInit, OnDestroy } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})

export class AppComponent implements AfterViewInit, OnDestroy {

  @ViewChild('leftPanel', {static: true})
  leftPanelElement: ElementRef;

  @ViewChild('rightPanel', {static: true})
  rightPanelElement: ElementRef;

  @ViewChild('separator', {static: true})
  separatorElement: ElementRef;

  private separatorMouseDownFunc: Function;
  private documentMouseMoveFunc: Function;
  private documentMouseUpFunc: Function;
  private documentSelectStartFunc: Function;

  private mouseDownInfo: any;

  constructor(private renderer: Renderer2) {
  }

  ngAfterViewInit() {

    // Init page separator
    this.separatorMouseDownFunc = this.renderer.listen(this.separatorElement.nativeElement, 'mousedown', e => {

      this.mouseDownInfo = {
        e: e,
        offsetLeft: this.separatorElement.nativeElement.offsetLeft,
        leftWidth: this.leftPanelElement.nativeElement.offsetWidth,
        rightWidth: this.rightPanelElement.nativeElement.offsetWidth
      };

      this.documentMouseMoveFunc = this.renderer.listen('document', 'mousemove', e => {
        let deltaX = e.clientX - this.mouseDownInfo.e.x;
        // set min and max width for left panel here
        const minLeftSize = 30;
        const maxLeftSize =  (this.mouseDownInfo.leftWidth + this.mouseDownInfo.rightWidth + 5) - 30;

        deltaX = Math.min(Math.max(deltaX, minLeftSize - this.mouseDownInfo.leftWidth), maxLeftSize - this.mouseDownInfo.leftWidth);

        this.leftPanelElement.nativeElement.style.width = this.mouseDownInfo.leftWidth + deltaX + 'px';
      });

      this.documentSelectStartFunc = this.renderer.listen('document', 'selectstart', e => {
        e.preventDefault();
      });

      this.documentMouseUpFunc = this.renderer.listen('document', 'mouseup', e => {
        this.documentMouseMoveFunc();
        this.documentSelectStartFunc();
        this.documentMouseUpFunc();
      });
    });
  }

  ngOnDestroy() {
    if (this.separatorMouseDownFunc) {
      this.separatorMouseDownFunc();
    }

    if (this.documentMouseMoveFunc) {
      this.documentMouseMoveFunc();
    }

    if (this.documentMouseUpFunc) {
      this.documentMouseUpFunc();
    }

    if (this.documentSelectStartFunc()) {
      this.documentSelectStartFunc();
    }
  }
}

.main {
  display: flex;
  height: 400px;
}

.left {
  width: calc(50% - 5px);
  background-color: rgba(0, 0, 0, 0.1);
}

.right {
  flex: auto;
  background-color: rgba(0, 0, 0, 0.2);
}

.separator {
  width: 5px;
  background-color: red;
  cursor: col-resize;
}

<div class="main">
  <div class="left" #leftPanel></div>
  <div class="separator" #separator></div>
  <div class="right" #rightPanel></div>
</div>

Running example on Stackblitz

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长情又很酷

2020-12-04 06:23

Improving on Reza's answer:

prevent the browser from interfering with a drag
prevent setting an element to a negative size
prevent drag getting out of sync with the mouse due to incremental delta interaction with element width saturation

<html><head><style>

.splitter {
    width: 100%;
    height: 100px;
    display: flex;
}

#separator {
    cursor: col-resize;
    background-color: #aaa;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='30'><path d='M2 0 v30 M5 0 v30 M8 0 v30' fill='none' stroke='black'/></svg>");
    background-repeat: no-repeat;
    background-position: center;
    width: 10px;
    height: 100%;

    /* Prevent the browser's built-in drag from interfering */
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#first {
    background-color: #dde;
    width: 20%;
    height: 100%;
    min-width: 10px;
}

#second {
    background-color: #eee;
    width: 80%;
    height: 100%;
    min-width: 10px;
}

</style></head><body>

<div class="splitter">
    <div id="first"></div>
    <div id="separator" ></div>
    <div id="second" ></div>
</div>

<script>

// A function is used for dragging and moving
function dragElement(element, direction)
{
    var   md; // remember mouse down info
    const first  = document.getElementById("first");
    const second = document.getElementById("second");

    element.onmousedown = onMouseDown;

    function onMouseDown(e)
    {
        //console.log("mouse down: " + e.clientX);
        md = {e,
              offsetLeft:  element.offsetLeft,
              offsetTop:   element.offsetTop,
              firstWidth:  first.offsetWidth,
              secondWidth: second.offsetWidth
             };

        document.onmousemove = onMouseMove;
        document.onmouseup = () => {
            //console.log("mouse up");
            document.onmousemove = document.onmouseup = null;
        }
    }

    function onMouseMove(e)
    {
        //console.log("mouse move: " + e.clientX);
        var delta = {x: e.clientX - md.e.clientX,
                     y: e.clientY - md.e.clientY};

        if (direction === "H" ) // Horizontal
        {
            // Prevent negative-sized elements
            delta.x = Math.min(Math.max(delta.x, -md.firstWidth),
                       md.secondWidth);

            element.style.left = md.offsetLeft + delta.x + "px";
            first.style.width = (md.firstWidth + delta.x) + "px";
            second.style.width = (md.secondWidth - delta.x) + "px";
        }
    }
}


dragElement( document.getElementById("separator"), "H" );

</script></body></html>

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你的背包

2020-12-04 06:23

Here is my lightweight vanilla JavaScript approach, using Flexbox:

http://codepen.io/lingtalfi/pen/zoNeJp

It was tested successfully in Google Chrome 54, Firefox 50, Safari 10, don't know about other browsers.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.rawgit.com/lingtalfi/simpledrag/master/simpledrag.js"></script>

    <style type="text/css">

        html, body {
            height: 100%;
        }

        .panes-container {
            display: flex;
            width: 100%;
            overflow: hidden;
        }

        .left-pane {
            width: 18%;
            background: #ccc;
        }

        .panes-separator {
            width: 2%;
            background: red;
            position: relative;
            cursor: col-resize;
        }

        .right-pane {
            flex: auto;
            background: #eee;
        }

        .panes-container,
        .panes-separator,
        .left-pane,
        .right-pane {
            margin: 0;
            padding: 0;
            height: 100%;
        }

    </style>

</head>

<body>

<div class="panes-container">
    <div class="left-pane" id="left-pane">
        <p>I'm the left pane</p>
        <ul>
            <li><a href="#">Item 1</a></li>
            <li><a href="#">Item 2</a></li>
            <li><a href="#">Item 3</a></li>
        </ul>
    </div>
    <div class="panes-separator" id="panes-separator"></div>
    <div class="right-pane" id="right-pane">
        <p>And I'm the right pane</p>
        <p>
            Lorem ipsum dolor sit amet, consectetur adipisicing elit. A accusantium at cum cupiditate dolorum, eius eum
            eveniet facilis illum maiores molestiae necessitatibus optio possimus sequi sunt, vel voluptate. Asperiores,
            voluptate!
        </p>
    </div>
</div>


<script>


    var leftPane = document.getElementById('left-pane');
    var rightPane = document.getElementById('right-pane');
    var paneSep = document.getElementById('panes-separator');

    // The script below constrains the target to move horizontally between a left and a right virtual boundaries.
    // - the left limit is positioned at 10% of the screen width
    // - the right limit is positioned at 90% of the screen width
    var leftLimit = 10;
    var rightLimit = 90;


    paneSep.sdrag(function (el, pageX, startX, pageY, startY, fix) {

        fix.skipX = true;

        if (pageX < window.innerWidth * leftLimit / 100) {
            pageX = window.innerWidth * leftLimit / 100;
            fix.pageX = pageX;
        }
        if (pageX > window.innerWidth * rightLimit / 100) {
            pageX = window.innerWidth * rightLimit / 100;
            fix.pageX = pageX;
        }

        var cur = pageX / window.innerWidth * 100;
        if (cur < 0) {
            cur = 0;
        }
        if (cur > window.innerWidth) {
            cur = window.innerWidth;
        }


        var right = (100-cur-2);
        leftPane.style.width = cur + '%';
        rightPane.style.width = right + '%';

    }, null, 'horizontal');


</script>

</body>
</html>

This HTML code depends on the simpledrag vanilla JavaScript lightweight library (less than 60 lines of code).

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野性不改

2020-12-04 06:28

Hmm, I came across this property in CSS 3. This might be easier to use.

CSS resize Property

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刺人心

2020-12-04 06:29

I wrote simple code for it without any third-party library. This code is only for a horizontal splitter (vertical is the same).

function onload()
{
    dragElement( document.getElementById("separator"), "H" );
}

// This function is used for dragging and moving
function dragElement( element, direction, handler )
{
  // Two variables for tracking positions of the cursor
  const drag = { x : 0, y : 0 };
  const delta = { x : 0, y : 0 };
  /* If present, the handler is where you move the DIV from
     otherwise, move the DIV from anywhere inside the DIV */
  handler ? ( handler.onmousedown = dragMouseDown ): ( element.onmousedown = dragMouseDown );

  // A function that will be called whenever the down event of the mouse is raised
  function dragMouseDown( e )
  {
    drag.x = e.clientX;
    drag.y = e.clientY;
    document.onmousemove = onMouseMove;
    document.onmouseup = () => { document.onmousemove = document.onmouseup = null; }
  }

  // A function that will be called whenever the up event of the mouse is raised
  function onMouseMove( e )
  {
    const currentX = e.clientX;
    const currentY = e.clientY;

    delta.x = currentX - drag.x;
    delta.y = currentY - drag.y;

    const offsetLeft = element.offsetLeft;
    const offsetTop = element.offsetTop;


    const first = document.getElementById("first");
    const second = document.getElementById("second");
    let firstWidth = first.offsetWidth;
    let secondWidth = second.offsetWidth;
    if (direction === "H" ) // Horizontal
    {
        element.style.left = offsetLeft + delta.x + "px";
        firstWidth += delta.x;
        secondWidth -= delta.x;
    }
    drag.x = currentX;
    drag.y = currentY;
    first.style.width = firstWidth + "px";
    second.style.width = secondWidth + "px";
  }
}

.splitter {
    width: 500px;
    height: 100px;
    display: flex;
}

#separator {
    cursor: col-resize;
    background: url(https://raw.githubusercontent.com/RickStrahl/jquery-resizable/master/assets/vsizegrip.png) center center no-repeat #535353;
    width: 10px;
    height: 100px;
    min-width: 10px;
}

#first {
    background-color: green;
    width: 100px;
    height: 100px;
    min-width: 10px;
}

#second {
    background-color: red;
    width: 390px;
    height: 100px;
    min-width: 10px;
}

<html>

    <head>
        <link rel="stylesheet" href="T10-Splitter.css">
        <script src="T10-Splitter.js"></script>
    </head>

    <body onload="onload()">
        <div class="splitter">
            <div id="first"></div>
            <div id="separator"></div>
            <div id="second"></div>
        </div>
    </body>

</html>

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