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+/** $Id$ */
+// Title: Fadomatic
+// Version: 1.2
+// Homepage: http://chimpen.com/fadomatic
+// Author: Philip McCarthy <fadomatic@chimpen.com>
+
+// Fade interval in milliseconds
+// Make this larger if you experience performance issues
+Fadomatic.INTERVAL_MILLIS = 50;
+
+// Creates a fader
+// element - The element to fade
+// speed - The speed to fade at, from 0.0 to 100.0
+// initialOpacity (optional, default 100) - element's starting opacity, 0 to 100
+// minOpacity (optional, default 0) - element's minimum opacity, 0 to 100
+// maxOpacity (optional, default 0) - element's minimum opacity, 0 to 100
+function Fadomatic (element, rate, initialOpacity, minOpacity, maxOpacity) {
+ this._element = element;
+ this._intervalId = null;
+ this._rate = rate;
+ this._isFadeOut = true;
+
+ // Set initial opacity and bounds
+ // NB use 99 instead of 100 to avoid flicker at start of fade
+ this._minOpacity = 0;
+ this._maxOpacity = 99;
+ this._opacity = 99;
+
+ if (typeof minOpacity != 'undefined') {
+ if (minOpacity < 0) {
+ this._minOpacity = 0;
+ } else if (minOpacity > 99) {
+ this._minOpacity = 99;
+ } else {
+ this._minOpacity = minOpacity;
+ }
+ }
+
+ if (typeof maxOpacity != 'undefined') {
+ if (maxOpacity < 0) {
+ this._maxOpacity = 0;
+ } else if (maxOpacity > 99) {
+ this._maxOpacity = 99;
+ } else {
+ this._maxOpacity = maxOpacity;
+ }
+
+ if (this._maxOpacity < this._minOpacity) {
+ this._maxOpacity = this._minOpacity;
+ }
+ }
+
+ if (typeof initialOpacity != 'undefined') {
+ if (initialOpacity > this._maxOpacity) {
+ this._opacity = this._maxOpacity;
+ } else if (initialOpacity < this._minOpacity) {
+ this._opacity = this._minOpacity;
+ } else {
+ this._opacity = initialOpacity;
+ }
+ }
+
+ // See if we're using W3C opacity, MSIE filter, or just
+ // toggling visiblity
+ if(typeof element.style.opacity != 'undefined') {
+
+ this._updateOpacity = this._updateOpacityW3c;
+
+ } else if(typeof element.style.filter != 'undefined') {
+
+ // If there's not an alpha filter on the element already,
+ // add one
+ if (element.style.filter.indexOf("alpha") == -1) {
+
+ // Attempt to preserve existing filters
+ var existingFilters="";
+ if (element.style.filter) {
+ existingFilters = element.style.filter+" ";
+ }
+ element.style.filter = existingFilters+"alpha(opacity="+this._opacity+")";
+ }
+
+ this._updateOpacity = this._updateOpacityMSIE;
+
+ } else {
+
+ this._updateOpacity = this._updateVisibility;
+ }
+
+ this._updateOpacity();
+}
+
+// Initiates a fade out
+Fadomatic.prototype.fadeOut = function () {
+ this._isFadeOut = true;
+ this._beginFade();
+};
+
+// Initiates a fade in
+Fadomatic.prototype.fadeIn = function () {
+ this._isFadeOut = false;
+ this._beginFade();
+};
+
+// Makes the element completely opaque, stops any fade in progress
+Fadomatic.prototype.show = function () {
+ this.haltFade();
+ this._opacity = this._maxOpacity;
+ this._updateOpacity();
+};
+
+// Makes the element completely transparent, stops any fade in progress
+Fadomatic.prototype.hide = function () {
+ this.haltFade();
+ this._opacity = 0;
+ this._updateOpacity();
+};
+
+// Halts any fade in progress
+Fadomatic.prototype.haltFade = function () {
+
+ clearInterval(this._intervalId);
+};
+
+// Resumes a fade where it was halted
+Fadomatic.prototype.resumeFade = function () {
+
+ this._beginFade();
+};
+
+// Pseudo-private members
+
+Fadomatic.prototype._beginFade = function () {
+
+ this.haltFade();
+ var objref = this;
+ this._intervalId = setInterval(function() { objref._tickFade(); },Fadomatic.INTERVAL_MILLIS);
+};
+
+Fadomatic.prototype._tickFade = function () {
+
+ if (this._isFadeOut) {
+ this._opacity -= this._rate;
+ if (this._opacity < this._minOpacity) {
+ this._opacity = this._minOpacity;
+ this.haltFade();
+ }
+ } else {
+ this._opacity += this._rate;
+ if (this._opacity > this._maxOpacity ) {
+ this._opacity = this._maxOpacity;
+ this.haltFade();
+ }
+ }
+
+ this._updateOpacity();
+};
+
+Fadomatic.prototype._updateVisibility = function () {
+
+ if (this._opacity > 0) {
+ this._element.style.visibility = 'visible';
+ } else {
+ this._element.style.visibility = 'hidden';
+ }
+};
+
+Fadomatic.prototype._updateOpacityW3c = function () {
+
+ this._element.style.opacity = this._opacity/100;
+ this._updateVisibility();
+};
+
+Fadomatic.prototype._updateOpacityMSIE = function () {
+
+ this._element.filters.alpha.opacity = this._opacity;
+ this._updateVisibility();
+};
+
+Fadomatic.prototype._updateOpacity = null;
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