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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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