source: admin/js/jquery/jquery.farbtastic.js @ 0:54703be25dd6

// $Id: farbtastic.js,v 1.2 2007/01/08 22:53:01 unconed Exp $
// Farbtastic 1.2

jQuery.fn.farbtastic = function (callback) {
     $.farbtastic(this, callback);
     return this;
};

jQuery.farbtastic = function (container, callback) {
     var container = $(container).get(0);
     return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
};

jQuery._farbtastic = function (container, callback) {
     // Store farbtastic object
     var fb = this;
     
     // Insert markup
     $(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>');
     var e = $('.farbtastic', container);
     fb.wheel = $('.wheel', container).get(0);
     // Dimensions
     fb.radius = 84;
     fb.square = 100;
     fb.width = 194;
     
     // Fix background PNGs in IE6
     if (navigator.appVersion.match(/MSIE [0-6]\./)) {
          $('*', e).each(function () {
               if (this.currentStyle.backgroundImage != 'none') {
                    var image = this.currentStyle.backgroundImage;
                    image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
                    $(this).css({
                         'backgroundImage': 'none',
                         'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
                    });
               }
          });
     }

     /**
     * Link to the given element(s) or callback.
     */
     fb.linkTo = function (callback) {
          // Unbind previous nodes
          if (typeof fb.callback == 'object') {
               $(fb.callback).unbind('keyup', fb.updateValue);
          }
          
          // Reset color
          fb.color = null;
          
          // Bind callback or elements
          if (typeof callback == 'function') {
               fb.callback = callback;
          }
          else if (typeof callback == 'object' || typeof callback == 'string') {
               fb.callback = $(callback);
               fb.callback.bind('keyup', fb.updateValue);
               if (fb.callback.get(0).value) {
                    fb.setColor(fb.callback.get(0).value);
               }
          }
          return this;
     };
     
     fb.updateValue = function (event) {
          if (this.value && this.value != fb.color) {
               fb.setColor(this.value);
          }
     };
     
     /**
     * Change color with HTML syntax #123456
     */
     fb.setColor = function (color) {
          var unpack = fb.unpack(color);
          if (fb.color != color && unpack) {
               fb.color = color;
               fb.rgb = unpack;
               fb.hsl = fb.RGBToHSL(fb.rgb);
               fb.updateDisplay();
          }
          return this;
     };
     
     /**
     * Change color with HSL triplet [0..1, 0..1, 0..1]
     */
     fb.setHSL = function (hsl) {
          fb.hsl = hsl;
          fb.rgb = fb.HSLToRGB(hsl);
          fb.color = fb.pack(fb.rgb);
          fb.updateDisplay();
          return this;
     };
     
     /////////////////////////////////////////////////////
     
     /**
     * Retrieve the coordinates of the given event relative to the center
     * of the widget.
     */
     fb.widgetCoords = function (event) {
          var x, y;
          var el = event.target || event.srcElement;
          var reference = fb.wheel;
          
          if (typeof event.offsetX != 'undefined') {
               // Use offset coordinates and find common offsetParent
               var pos = { x: event.offsetX, y: event.offsetY };
               
               // Send the coordinates upwards through the offsetParent chain.
               var e = el;
               while (e) {
                    e.mouseX = pos.x;
                    e.mouseY = pos.y;
                    pos.x += e.offsetLeft;
                    pos.y += e.offsetTop;
                    e = e.offsetParent;
               }
               
               // Look for the coordinates starting from the wheel widget.
               var e = reference;
               var offset = { x: 0, y: 0 };
               while (e) {
                    if (typeof e.mouseX != 'undefined') {
                         x = e.mouseX - offset.x;
                         y = e.mouseY - offset.y;
                         break;
                    }
                    offset.x += e.offsetLeft;
                    offset.y += e.offsetTop;
                    e = e.offsetParent;
               }
               
               // Reset stored coordinates
               e = el;
               while (e) {
                    e.mouseX = undefined;
                    e.mouseY = undefined;
                    e = e.offsetParent;
               }
          }
          else {
          // Use absolute coordinates
               var pos = fb.absolutePosition(reference);
               x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
               y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
          }
          // Subtract distance to middle
          return { x: x - fb.width / 2, y: y - fb.width / 2 };
     };
     
     /**
     * Mousedown handler
     */
     fb.mousedown = function (event) {
          // Capture mouse
          if (!document.dragging) {
               $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
               document.dragging = true;
          }
          
          // Check which area is being dragged
          var pos = fb.widgetCoords(event);
          fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
          
          // Process
          fb.mousemove(event);
          return false;
     };
     
     /**
     * Mousemove handler
     */
     fb.mousemove = function (event) {
          // Get coordinates relative to color picker center
          var pos = fb.widgetCoords(event);
          
          // Set new HSL parameters
          if (fb.circleDrag) {
               var hue = Math.atan2(pos.x, -pos.y) / 6.28;
               if (hue < 0) hue += 1;
               fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
          }
          else {
               var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
               var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
               fb.setHSL([fb.hsl[0], sat, lum]);
          }
          return false;
     };
     
     /**
     * Mouseup handler
     */
     fb.mouseup = function () {
          // Uncapture mouse
          $(document).unbind('mousemove', fb.mousemove);
          $(document).unbind('mouseup', fb.mouseup);
          document.dragging = false;
     };
     
     /**
     * Update the markers and styles
     */
     fb.updateDisplay = function () {
          // Markers
          var angle = fb.hsl[0] * 6.28;
          $('.h-marker', e).css({
               left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
               top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
          });
          
          $('.sl-marker', e).css({
               left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
               top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
          });
          
          // Saturation/Luminance gradient
          $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
          
          // Linked elements or callback
          if (typeof fb.callback == 'object') {
               // Set background/foreground color
               $(fb.callback).css({
                    backgroundColor: fb.color,
                    color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
               });
                    
               // Change linked value
               $(fb.callback).each(function() {
                    if (this.value != fb.color) {
                         this.value = fb.color;
                    }
               });
               $(fb.callback).change();
          }
          else if (typeof fb.callback == 'function') {
               fb.callback.call(fb, fb.color);
          }
     };
     
     /**
     * Get absolute position of element
     */
     fb.absolutePosition = function (el) {
          var r = { x: el.offsetLeft, y: el.offsetTop };
          // Resolve relative to offsetParent
          if (el.offsetParent) {
               var tmp = fb.absolutePosition(el.offsetParent);
               r.x += tmp.x;
               r.y += tmp.y;
          }
          return r;
     };
     
     /* Various color utility functions */
     fb.pack = function (rgb) {
          var r = Math.round(rgb[0] * 255);
          var g = Math.round(rgb[1] * 255);
          var b = Math.round(rgb[2] * 255);
          return '#' + (r < 16 ? '0' : '') + r.toString(16) +
               (g < 16 ? '0' : '') + g.toString(16) +
               (b < 16 ? '0' : '') + b.toString(16);
     };
     
     fb.unpack = function (color) {
          if (color.length == 7) {
               return [parseInt('0x' + color.substring(1, 3)) / 255,
                    parseInt('0x' + color.substring(3, 5)) / 255,
                    parseInt('0x' + color.substring(5, 7)) / 255];
          }
          else if (color.length == 4) {
               return [parseInt('0x' + color.substring(1, 2)) / 15,
                    parseInt('0x' + color.substring(2, 3)) / 15,
                    parseInt('0x' + color.substring(3, 4)) / 15];
          }
     };
     
     fb.HSLToRGB = function (hsl) {
          var m1, m2, r, g, b;
          var h = hsl[0], s = hsl[1], l = hsl[2];
          m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
          m1 = l * 2 - m2;
          return [this.hueToRGB(m1, m2, h+0.33333),
               this.hueToRGB(m1, m2, h),
               this.hueToRGB(m1, m2, h-0.33333)];
     };
     
     fb.hueToRGB = function (m1, m2, h) {
          h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
          if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
          if (h * 2 < 1) return m2;
          if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
          return m1;
     };
     
     fb.RGBToHSL = function (rgb) {
          var min, max, delta, h, s, l;
          var r = rgb[0], g = rgb[1], b = rgb[2];
          min = Math.min(r, Math.min(g, b));
          max = Math.max(r, Math.max(g, b));
          delta = max - min;
          l = (min + max) / 2;
          s = 0;
          if (l > 0 && l < 1) {
               s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
          }
          h = 0;
          if (delta > 0) {
               if (max == r && max != g) h += (g - b) / delta;
               if (max == g && max != b) h += (2 + (b - r) / delta);
               if (max == b && max != r) h += (4 + (r - g) / delta);
               h /= 6;
          }
          return [h, s, l];
     };
     
     // Install mousedown handler (the others are set on the document on-demand)
     $('*', e).mousedown(fb.mousedown);
     
     // Init color
     fb.setColor('#000000');
     
     // Set linked elements/callback
     if (callback) {
          fb.linkTo(callback);
     }
};