Question

我使用this的色轮选择器，我想出了一个问题。当我在色轮上方添加文本，然后向下滚动并更改色轮颜色时，色轮光标不包含在实际圆圈中。（它在另一个地方形成一个假想的圆圈，并且色轮光标被约束在那个想象的圆圈中。）

另一个可能与第一个问题相关的问题是，如果你在浏览器中放大，（在chrome：ctrl +中），colorwheels光标像固定元素一样保持位置，它跟随滚动。

如何让彩色光标始终保持在圆圈中？

相关代码（JSFiddle中的第210-210行）：

hsv_mapCursor.style.left = ((x * r + colorDiscRadius + doc.body.scrollLeft + doc.documentElement.scrollLeft) - 1) + 'px';
hsv_mapCursor.style.top = ((y * r + colorDiscRadius + doc.body.scrollTop + doc.documentElement.scrollTop) - 1) + 'px';

this website

＆＃13;

var Tools = {}, // provides functions like addEvent, ... getOrigin, etc.
  startPoint,
  currentTarget,
  currentTargetHeight = 0;
/* ----------------------------------- */
/* --------- Tool Functions ---------- */
/* ----------------------------------- */
function getOrigin(elm) {
  var box = (elm.getBoundingClientRect) ? elm.getBoundingClientRect() : {
      top: 0,
      left: 0
    },
    doc = elm && elm.ownerDocument,
    body = doc.body,
    win = doc.defaultView || doc.parentWindow || window,
    docElem = doc.documentElement || body.parentNode,
    clientTop = docElem.clientTop || body.clientTop || 0, // border on html or body or both
    clientLeft = docElem.clientLeft || body.clientLeft || 0;

  return {
    left: box.left + (win.pageXOffset || docElem.scrollLeft) - clientLeft,
    top: box.top + (win.pageYOffset || docElem.scrollTop) - clientTop
  };
}

function addEvent(obj, type, func) {
  addEvent.cache = addEvent.cache ||  {
    _get: function(obj, type, func, checkOnly) {
      var cache = addEvent.cache[type] || [];

      for (var n = cache.length; n--;) {
        if (obj === cache[n].obj && '' + func === '' + cache[n].func) {
          func = cache[n].func;
          if (!checkOnly) {
            cache[n] = cache[n].obj = cache[n].func = null;
            cache.splice(n, 1);
          }
          return func;
        }
      }
    },
    _set: function(obj, type, func) {
      var cache = addEvent.cache[type] = addEvent.cache[type] || [];

      if (addEvent.cache._get(obj, type, func, true)) {
        return true;
      } else {
        cache.push({
          func: func,
          obj: obj
        });
      }
    }
  };

  if (!func.name && addEvent.cache._set(obj, type, func) || typeof func !== 'function') {
    return;
  }

  if (obj.addEventListener) obj.addEventListener(type, func, false);
  else obj.attachEvent('on' + type, func);
}

function removeEvent(obj, type, func) {
  if (typeof func !== 'function') return;
  if (!func.name) {
    func = addEvent.cache._get(obj, type, func) || func;
  }

  if (obj.removeEventListener) obj.removeEventListener(type, func, false);
  else obj.detachEvent('on' + type, func);
}

Tools.getOrigin = getOrigin;
Tools.addEvent = addEvent;
Tools.removeEvent = removeEvent;









/* ---------------------------------- */
/* ---- HSV-circle color picker ----- */
/* ---------------------------------- */

// Create HSV-circle Relavent Variables
var hsv_map = document.getElementById('hsv_map'),
  colorDiskWrapper = document.getElementById('colorDiskWrapper'),
  colorDisc = document.getElementById('surface'),
  hsv_mapCover = document.getElementById('cover'),
  hsv_mapCursor = document.getElementById('hsv-cursor'),

  luminenceBarWrapper = document.getElementById('luminenceBarWrapper'),
  hsv_barBGLayer = document.getElementById('bar-bg'),
  hsv_barWhiteLayer = document.getElementById('bar-white'),
  luminanceBar = document.getElementById('luminanceBar'),
  hsv_barcursor = document.getElementById('hsv-barcursor'),
  hsv_barCursors = document.getElementById('hsv-barcursors'),
  hsv_barCursorsCln = hsv_barCursors.className,

  luminanceBarContext = luminanceBar.getContext("2d"),
  colorDiscHeight = colorDisc.offsetHeight,
  colorDiscRadius = colorDisc.offsetHeight / 2;



// generic function for drawing a canvas disc
var drawDisk = function(ctx, coords, radius, steps, colorCallback) {
    var x = coords[0] || coords, // coordinate on x-axis
      y = coords[1] || coords, // coordinate on y-axis
      a = radius[0] || radius, // radius on x-axis
      b = radius[1] || radius, // radius on y-axis
      angle = 360,
      rotate = 0,
      coef = Math.PI / 180;

    ctx.save();
    ctx.translate(x - a, y - b);
    ctx.scale(a, b);

    steps = (angle / steps) || 360;

    for (; angle > 0; angle -= steps) {
      ctx.beginPath();
      if (steps !== 360) ctx.moveTo(1, 1); // stroke
      ctx.arc(1, 1, 1, (angle - (steps / 2) - 1) * coef, (angle + (steps / 2) + 1) * coef);

      if (colorCallback) {
        colorCallback(ctx, angle);
      } else {
        ctx.fillStyle = 'black';
        ctx.fill();
      }
    }
    ctx.restore();
  },
  drawCircle = function(ctx, coords, radius, color, width) { // uses drawDisk
    width = width || 1;
    radius = [
      (radius[0] || radius) - width / 2, (radius[1] || radius) - width / 2
    ];
    drawDisk(ctx, coords, radius, 1, function(ctx, angle) {
      ctx.restore();
      ctx.lineWidth = width;
      ctx.strokeStyle = color || '#000';
      ctx.stroke();
    });
  };

if (colorDisc.getContext) {
  drawDisk( // HSV color wheel with white center
    colorDisc.getContext("2d"), [colorDisc.width / 2, colorDisc.height / 2], [colorDisc.width / 2 - 1, colorDisc.height / 2 - 1],
    360,
    function(ctx, angle) {
      var gradient = ctx.createRadialGradient(1, 1, 1, 1, 1, 0);
      gradient.addColorStop(0, 'hsl(' + (360 - angle + 0) + ', 100%, 50%)');
      gradient.addColorStop(1, "#FFFFFF");

      ctx.fillStyle = gradient;
      ctx.fill();
    }
  );
  drawCircle( // gray border
    colorDisc.getContext("2d"), [colorDisc.width / 2, colorDisc.height / 2], [colorDisc.width / 2, colorDisc.height / 2],
    '#555',
    3
  );
}


// draw the luminanceBar bar
var gradient = luminanceBarContext.createLinearGradient(0, 0, 0, colorDiscHeight);

gradient.addColorStop(0, "transparent");
gradient.addColorStop(1, "black");

luminanceBarContext.fillStyle = gradient;
luminanceBarContext.fillRect(0, 0, luminanceBar.offsetWidth, colorDiscHeight);









// Manage Color Wheel Mouse Events
var renderHSVPicker = function(color) { // used in renderCallback of 'new ColorPicker'
  var pi2 = Math.PI * 2,
    x = Math.cos(pi2 - color.hsv.h * pi2),
    y = Math.sin(pi2 - color.hsv.h * pi2),
    r = color.hsv.s * colorDiscRadius;

  hsv_mapCover.style.opacity = 1 - color.hsv.v;

  // this is the faster version...
  hsv_barWhiteLayer.style.opacity = 1 - color.hsv.s;
  hsv_barBGLayer.style.backgroundColor = 'rgb(' +
    color.hueRGB.r + ',' +
    color.hueRGB.g + ',' +
    color.hueRGB.b + ')';

  var doc = window.document;

  hsv_mapCursor.style.left = ((x * r + colorDiscRadius + doc.body.scrollLeft + doc.documentElement.scrollLeft) - 1) + 'px';
  hsv_mapCursor.style.top = ((y * r + colorDiscRadius + doc.body.scrollTop + doc.documentElement.scrollTop) - 1) + 'px';

  hsv_mapCursor.style.borderColor = hsv_barcursor.style.borderColor = color.RGBLuminance > 0.22 ? 'black' : 'white';
  hsv_barcursor.style.top = (((1 - color.hsv.v) * colorDiscRadius * 2 + doc.body.scrollTop + doc.documentElement.scrollTop) + -7) + 'px';
};


var myColor = new Colors(),
  doRender = function(color) {
    renderHSVPicker(color);
  },
  renderTimer,
  // those functions are in case there is no ColorPicker but only Colors involved
  startRender = function(oneTime) {
    if (oneTime) { // only Colors is instanciated
      doRender(myColor.colors);
    } else {
      renderTimer = window.setInterval(
        function() {
          doRender(myColor.colors);
          // http://stackoverflow.com/questions/2940054/
        }, 13); // 1000 / 60); // ~16.666 -> 60Hz or 60fps
    }
  },
  stopRender = function() {
    window.clearInterval(renderTimer);
  };





// Create Event Functions
var hsvDown = function(e) { // mouseDown callback
    var target = e.target || e.srcElement;

    if (e.preventDefault) e.preventDefault();

    //currentTarget = target.id ? target : target.parentNode;
    if (target === hsv_mapCover || target === hsv_mapCursor || target === hsv_barcursor) {
      currentTarget = target.parentNode;
    } else if (target === hsv_barCursors) {
      currentTarget = target;
    } else {
      return;
    }

    startPoint = Tools.getOrigin(currentTarget);
    currentTargetHeight = currentTarget.offsetHeight; // as diameter of circle

    Tools.addEvent(window, 'mousemove', hsvMove);
    hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = 'none';
    hsvMove(e);
    startRender();
  },
  hsvMove = function(e) { // mouseMove callback
    var r, x, y, h, s;

    if (currentTarget === colorDiskWrapper) { // the circle
      r = currentTargetHeight / 2;
      x = e.clientX - startPoint.left - r;
      y = e.clientY - startPoint.top - r;
      h = 360 - ((Math.atan2(y, x) * 180 / Math.PI) + (y < 0 ? 360 : 0));
      s = (Math.sqrt((x * x) + (y * y)) / r) * 100;
      myColor.setColor({
        h: h,
        s: s
      }, 'hsv');
    } else if (currentTarget === hsv_barCursors) { // the luminanceBar
      myColor.setColor({
        v: (currentTargetHeight - (e.clientY - startPoint.top)) / currentTargetHeight * 100
      }, 'hsv');
    }
  };

// Initial Rendering
doRender(myColor.colors);

// Adde Events To Objects
Tools.addEvent(hsv_map, 'mousedown', hsvDown); // event delegation
Tools.addEvent(window, 'mouseup', function() {
  Tools.removeEvent(window, 'mousemove', hsvMove);
  hsv_mapCover.style.cursor = hsv_mapCursor.style.cursor = hsv_barCursors.style.cursor = 'pointer';
  stopRender();
});

＆＃13;

#wrapper {
  width: 500px;
  height: 500px;
  background-color: pink;
}
#hsv_map {
  width: 540px;
  height: 500px;
  position: absolute;
}
#colorDiskWrapper {
  border-radius: 50%;
  position: relative;
  width: 500px;
}
#cover {
  background-color: black;
  border-radius: 50%;
  cursor: pointer;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
#bar-bg,
#bar-white {
  position: absolute;
  right: 0;
  top: 0;
  width: 15px;
  height: 500px;
}
#bar-white {
  background-color: #fff;
}
#hsv-cursor {
  position: absolute;
  border: 2px solid #eee;
  border-radius: 50%;
  width: 9px;
  height: 9px;
  margin: -5px;
  cursor: pointer;
}
.no-cursor #hsv-cursor,
#hsv_map.no-cursor #cover {
  cursor: none;
  /* also works in IE8 */
  /*url(_blank.gif), url(_blank.png), url(_blank.cur), auto;*/
}
#luminanceBar {
  position: absolute;
  right: 0;
  top: 0;
}
#hsv-barcursors {
  position: absolute;
  right: -7.5px;
  width: 30px;
  top: 0;
  height: 500px;
  overflow: hidden;
  cursor: pointer;
}
#hsv-barcursor {
  position: absolute;
  right: 7.5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid black;
  margin-bottom: 5px;
}

＆＃13;

<script src="https://rawgit.com/PitPik/colorPicker/master/colors.js"></script>
Lorem ipsum dolor sit amet, his id nonumy quaestio efficiantur. Quidam deleniti eum no, pri adhuc putant ea. Nec cu melius accusata, et vim lorem quaeque minimum. At aperiri principes complectitur eam, quo ne soleat accusamus ullamcorper, sed fugit adipiscing
no. Eripuit consequuntur quo no, his accusamus persequeris ea. Exerci delenit ad eos, ei sea tamquam ancillae necessitatibus. Est legere possim mnesarchum an. Vim nonumes expetendis ea, mei te mutat propriae platonem, per ut feugiat reprimique. Has deserunt
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in. Ei consul ubique conclusionemque eum, et alterum apeirian nam. Quem odio adipiscing has ei. Et has solum perfecto tincidunt, quo no indoctum prodesset. Pri ut tritani ceteros tractatos, in legere disputationi mea. Ne mel mutat graeci, mei eu doctus
appetere. Ius dicam imperdiet id, duo commune phaedrum ut, ut reque minim vis. Instructior signiferumque mea id. Nam ut vocibus recusabo consulatu. No mea postea mandamus prodesset, his hinc iusto in, no atqui consequat his. Discere sapientem id vel,
eam ea idque lucilius, ne eos labitur pericula. Ea dicat sonet nec, te pri libris putant eirmod, ancillae voluptatibus ut eam. Dicat commune necessitatibus nec cu, an enim purto menandri vel, eu ferri altera admodum duo.Lorem ipsum dolor sit amet, his
id nonumy quaestio efficiantur. Quidam deleniti eum no, pri adhuc putant ea. Nec cu melius accusata, et vim lorem quaeque minimum. At aperiri principes complectitur eam, quo ne soleat accusamus ullamcorper, sed fugit adipiscing no. Eripuit consequuntur
quo no, his accusamus persequeris ea. Exerci delenit ad eos, ei sea tamquam ancillae necessitatibus. Est legere possim mnesarchum an. Vim nonumes expetendis ea, mei te mutat propriae platonem, per ut feugiat reprimique. Has deserunt nominati liberavisse
ut. Per cibo ubique omittam in, has te decore denique, justo nominavi id pro. Ei ius paulo deserunt pertinacia. Nec nostro expetenda id. Nec no esse interesset, id qui ferri errem. Qui possim ponderum platonem ea, nostro epicuri nam in. Ei consul ubique
conclusionemque eum, et alterum apeirian nam. Quem odio adipiscing has ei. Et has solum perfecto tincidunt, quo no indoctum prodesset. Pri ut tritani ceteros tractatos, in legere disputationi mea. Ne mel mutat graeci, mei eu doctus appetere. Ius dicam
imperdiet id, duo commune phaedrum ut, ut reque minim vis. Instructior signiferumque mea id. Nam ut vocibus recusabo consulatu. No mea postea mandamus prodesset, his hinc iusto in, no atqui consequat his. Discere sapientem id vel, eam ea idque lucilius,
ne eos labitur pericula. Ea dicat sonet nec, te pri libris putant eirmod, ancillae voluptatibus ut eam. Dicat commune necessitatibus nec cu, an enim purto menandri vel, eu ferri altera admodum duo.
<div id="wrapper">
  <div id="hsv_map">
    <div id="colorDiskWrapper">
      <canvas id="surface" width="500" height="500"></canvas>
      <div id="cover"></div>
      <div id="hsv-cursor"></div>
    </div>
    <div id="luminenceBarWrapper">
      <div id="bar-bg"></div>
      <div id="bar-white"></div>
      <canvas id="luminanceBar" width="15" height="500"></canvas>
      <div id="hsv-barcursors" id="hsv_cursors">
        <div id="hsv-barcursor"></div>
      </div>
    </div>
  </div>
</div>

＆＃13;

Answer 1

将此添加到您的css：

NSConcreteNotification 0x14a2664b0 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x14a3e1be0>; userInfo = {
invalidatedAll =     (
    "0xd00000000d5c000e <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/AdditionalAssetAttributes/p855>",
    "0xd00000000d58000e <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/AdditionalAssetAttributes/p854>",
    "0xd00000000d5c000c <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/Asset/p855>",
    "0xd00000000d58000c <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/Asset/p854>",
    "0xd000000001d40018 <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/SidecarFile/p117>",
    "0xd000000001d00018 <x-coredata://B12EF0BD-E372-44D2-AF2F-8E28C5EF3E00/SidecarFile/p116>"
);
managedObjectContext = "<NSManagedObjectContext: 0x14a3e1be0>";

<强> JSFIDDLE

滚动时元素进入错误的位置

1 个答案: