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Source: /rsc/js/jquery/jquery.farbtastic.js - 345 lines - 9912 bytes - Text - Print

Description: Farbtastic Color Picker 1.2 © 2008 Steven Wittens This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

   1  /**
   2   * Farbtastic Color Picker 1.2
   3   * © 2008 Steven Wittens
   4   *
   5   * This program is free software; you can redistribute it and/or modify
   6   * it under the terms of the GNU General Public License as published by
   7   * the Free Software Foundation; either version 2 of the License, or
   8   * (at your option) any later version.
   9   *
  10   * This program is distributed in the hope that it will be useful,
  11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   * GNU General Public License for more details.
  14   *
  15   * You should have received a copy of the GNU General Public License
  16   * along with this program; if not, write to the Free Software
  17   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18   */
  19  
  20  jQuery.fn.farbtastic = function (callback) {
  21    $.farbtastic(this, callback);
  22    return this;
  23  };
  24  
  25  jQuery.farbtastic = function (container, callback) {
  26    var container = $(container).get(0);
  27    return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
  28  }
  29  
  30  jQuery._farbtastic = function (container, callback) {
  31    // Store farbtastic object
  32    var fb = this;
  33  
  34    // Insert markup
  35    $(container).html('<div class="farbtastic"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>');
  36    var e = $('.farbtastic', container);
  37    fb.wheel = $('.wheel', container).get(0);
  38    // Dimensions
  39    fb.radius = 84;
  40    fb.square = 100;
  41    fb.width = 194;
  42  
  43    // Fix background PNGs in IE6
  44    if (navigator.appVersion.match(/MSIE [0-6]\./)) {
  45      $('*', e).each(function () {
  46        if (this.currentStyle.backgroundImage != 'none') {
  47          var image = this.currentStyle.backgroundImage;
  48          image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
  49          $(this).css({
  50            'backgroundImage': 'none',
  51            'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
  52          });
  53        }
  54      });
  55    }
  56  
  57    /**
  58     * Link to the given element(s) or callback.
  59     */
  60    fb.linkTo = function (callback) {
  61      // Unbind previous nodes
  62      if (typeof fb.callback == 'object') {
  63        $(fb.callback).unbind('keyup', fb.updateValue);
  64      }
  65  
  66      // Reset color
  67      fb.color = null;
  68  
  69      // Bind callback or elements
  70      if (typeof callback == 'function') {
  71        fb.callback = callback;
  72      }
  73      else if (typeof callback == 'object' || typeof callback == 'string') {
  74        fb.callback = $(callback);
  75        fb.callback.bind('keyup', fb.updateValue);
  76        if (fb.callback.get(0).value) {
  77          fb.setColor(fb.callback.get(0).value);
  78        }
  79      }
  80      return this;
  81    }
  82    fb.updateValue = function (event) {
  83      if (this.value && this.value != fb.color) {
  84        fb.setColor(this.value);
  85      }
  86    }
  87  
  88    /**
  89     * Change color with HTML syntax #123456
  90     */
  91    fb.setColor = function (color) {
  92      var unpack = fb.unpack(color);
  93      if (fb.color != color && unpack) {
  94        fb.color = color;
  95        fb.rgb = unpack;
  96        fb.hsl = fb.RGBToHSL(fb.rgb);
  97        fb.updateDisplay();
  98      }
  99      return this;
 100    }
 101  
 102    /**
 103     * Change color with HSL triplet [0..1, 0..1, 0..1]
 104     */
 105    fb.setHSL = function (hsl) {
 106      fb.hsl = hsl;
 107      fb.rgb = fb.HSLToRGB(hsl);
 108      fb.color = fb.pack(fb.rgb);
 109      fb.updateDisplay();
 110      return this;
 111    }
 112  
 113    /////////////////////////////////////////////////////
 114  
 115    /**
 116     * Retrieve the coordinates of the given event relative to the center
 117     * of the widget.
 118     */
 119    fb.widgetCoords = function (event) {
 120      var x, y;
 121      var el = event.target || event.srcElement;
 122      var reference = fb.wheel;
 123  
 124      if (typeof event.offsetX != 'undefined') {
 125        // Use offset coordinates and find common offsetParent
 126        var pos = { x: event.offsetX, y: event.offsetY };
 127  
 128        // Send the coordinates upwards through the offsetParent chain.
 129        var e = el;
 130        while (e) {
 131          e.mouseX = pos.x;
 132          e.mouseY = pos.y;
 133          pos.x += e.offsetLeft;
 134          pos.y += e.offsetTop;
 135          e = e.offsetParent;
 136        }
 137  
 138        // Look for the coordinates starting from the wheel widget.
 139        var e = reference;
 140        var offset = { x: 0, y: 0 }
 141        while (e) {
 142          if (typeof e.mouseX != 'undefined') {
 143            x = e.mouseX - offset.x;
 144            y = e.mouseY - offset.y;
 145            break;
 146          }
 147          offset.x += e.offsetLeft;
 148          offset.y += e.offsetTop;
 149          e = e.offsetParent;
 150        }
 151  
 152        // Reset stored coordinates
 153        e = el;
 154        while (e) {
 155          e.mouseX = undefined;
 156          e.mouseY = undefined;
 157          e = e.offsetParent;
 158        }
 159      }
 160      else {
 161        // Use absolute coordinates
 162        var pos = fb.absolutePosition(reference);
 163        x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
 164        y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
 165      }
 166      // Subtract distance to middle
 167      return { x: x - fb.width / 2, y: y - fb.width / 2 };
 168    }
 169  
 170    /**
 171     * Mousedown handler
 172     */
 173    fb.mousedown = function (event) {
 174      // Capture mouse
 175      if (!document.dragging) {
 176        $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
 177        document.dragging = true;
 178      }
 179  
 180      // Check which area is being dragged
 181      var pos = fb.widgetCoords(event);
 182      fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
 183  
 184      // Process
 185      fb.mousemove(event);
 186      return false;
 187    }
 188  
 189    /**
 190     * Mousemove handler
 191     */
 192    fb.mousemove = function (event) {
 193      // Get coordinates relative to color picker center
 194      var pos = fb.widgetCoords(event);
 195  
 196      // Set new HSL parameters
 197      if (fb.circleDrag) {
 198        var hue = Math.atan2(pos.x, -pos.y) / 6.28;
 199        if (hue < 0) hue += 1;
 200        fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
 201      }
 202      else {
 203        var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
 204        var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
 205        fb.setHSL([fb.hsl[0], sat, lum]);
 206      }
 207      return false;
 208    }
 209  
 210    /**
 211     * Mouseup handler
 212     */
 213    fb.mouseup = function () {
 214      // Uncapture mouse
 215      $(document).unbind('mousemove', fb.mousemove);
 216      $(document).unbind('mouseup', fb.mouseup);
 217      document.dragging = false;
 218    }
 219  
 220    /**
 221     * Update the markers and styles
 222     */
 223    fb.updateDisplay = function () {
 224      // Markers
 225      var angle = fb.hsl[0] * 6.28;
 226      $('.h-marker', e).css({
 227        left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
 228        top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
 229      });
 230  
 231      $('.sl-marker', e).css({
 232        left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
 233        top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
 234      });
 235  
 236      // Saturation/Luminance gradient
 237      $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
 238  
 239      // Linked elements or callback
 240      if (typeof fb.callback == 'object') {
 241        // Set background/foreground color
 242        $(fb.callback).css({
 243          backgroundColor: fb.color,
 244          color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
 245        });
 246  
 247        // Change linked value
 248        $(fb.callback).each(function() {
 249          if (this.value != fb.color) {
 250            this.value = fb.color;
 251          }
 252        });
 253      }
 254      else if (typeof fb.callback == 'function') {
 255        fb.callback.call(fb, fb.color);
 256      }
 257    }
 258  
 259    /**
 260     * Get absolute position of element
 261     */
 262    fb.absolutePosition = function (el) {
 263      var r = { x: el.offsetLeft, y: el.offsetTop };
 264      // Resolve relative to offsetParent
 265      if (el.offsetParent) {
 266        var tmp = fb.absolutePosition(el.offsetParent);
 267        r.x += tmp.x;
 268        r.y += tmp.y;
 269      }
 270      return r;
 271    };
 272  
 273    /* Various color utility functions */
 274    fb.pack = function (rgb) {
 275      var r = Math.round(rgb[0] * 255);
 276      var g = Math.round(rgb[1] * 255);
 277      var b = Math.round(rgb[2] * 255);
 278      return '#' + (r < 16 ? '0' : '') + r.toString(16) +
 279             (g < 16 ? '0' : '') + g.toString(16) +
 280             (b < 16 ? '0' : '') + b.toString(16);
 281    }
 282  
 283    fb.unpack = function (color) {
 284      if (color.length == 7) {
 285        return [parseInt('0x' + color.substring(1, 3)) / 255,
 286          parseInt('0x' + color.substring(3, 5)) / 255,
 287          parseInt('0x' + color.substring(5, 7)) / 255];
 288      }
 289      else if (color.length == 4) {
 290        return [parseInt('0x' + color.substring(1, 2)) / 15,
 291          parseInt('0x' + color.substring(2, 3)) / 15,
 292          parseInt('0x' + color.substring(3, 4)) / 15];
 293      }
 294    }
 295  
 296    fb.HSLToRGB = function (hsl) {
 297      var m1, m2, r, g, b;
 298      var h = hsl[0], s = hsl[1], l = hsl[2];
 299      m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
 300      m1 = l * 2 - m2;
 301      return [this.hueToRGB(m1, m2, h+0.33333),
 302          this.hueToRGB(m1, m2, h),
 303          this.hueToRGB(m1, m2, h-0.33333)];
 304    }
 305  
 306    fb.hueToRGB = function (m1, m2, h) {
 307      h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
 308      if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
 309      if (h * 2 < 1) return m2;
 310      if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
 311      return m1;
 312    }
 313  
 314    fb.RGBToHSL = function (rgb) {
 315      var min, max, delta, h, s, l;
 316      var r = rgb[0], g = rgb[1], b = rgb[2];
 317      min = Math.min(r, Math.min(g, b));
 318      max = Math.max(r, Math.max(g, b));
 319      delta = max - min;
 320      l = (min + max) / 2;
 321      s = 0;
 322      if (l > 0 && l < 1) {
 323        s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
 324      }
 325      h = 0;
 326      if (delta > 0) {
 327        if (max == r && max != g) h += (g - b) / delta;
 328        if (max == g && max != b) h += (2 + (b - r) / delta);
 329        if (max == b && max != r) h += (4 + (r - g) / delta);
 330        h /= 6;
 331      }
 332      return [h, s, l];
 333    }
 334  
 335    // Install mousedown handler (the others are set on the document on-demand)
 336    $('*', e).mousedown(fb.mousedown);
 337  
 338      // Init color
 339    fb.setColor('#000000');
 340  
 341    // Set linked elements/callback
 342    if (callback) {
 343      fb.linkTo(callback);
 344    }
 345  }

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