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Streamlined and unified opacity methods #73

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Streamlined and unified opacity methods #73

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42 changes: 23 additions & 19 deletions src/prototype/dom/dom.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2847,6 +2847,8 @@
*
**/
function getStyle(element, style) {
if (style === 'opacity') return getOpacity(element);

element = $(element);
style = normalizeStyleName(style);

Expand All @@ -2858,7 +2860,6 @@
value = css ? css[style] : null;
}

if (style === 'opacity') return value ? parseFloat(value) : 1.0;
return value === 'auto' ? null : value;
}

Expand All @@ -2883,6 +2884,8 @@
}

function getStyle_IE(element, style) {
if (style === 'opacity') return getOpacity_IE(element);

element = $(element);
style = normalizeStyleName_IE(style);

Expand All @@ -2893,9 +2896,6 @@
value = element.currentStyle[style];
}

if (style === 'opacity' && !STANDARD_CSS_OPACITY_SUPPORTED)
return getOpacity_IE(element);

if (value === 'auto') {
// If we need a dimension, return null for hidden elements, but return
// pixel values for visible elements.
Expand Down Expand Up @@ -2955,14 +2955,13 @@
// the standard approach (an `opacity` property in CSS) and the old-style
// IE approach (a proprietary `filter` property). They are written to
// prefer the standard approach unless it isn't supported.
function setOpacity_IE(element, value) {
// Prefer the standard CSS approach unless it's not supported.
if (STANDARD_CSS_OPACITY_SUPPORTED)
return setOpacity(element, value);
var setOpacity_IE = STANDARD_CSS_OPACITY_SUPPORTED ? setOpacity : function(element, value) {
element = $(element);
var style = element.style;
if (!element.currentStyle || !element.currentStyle.hasLayout)
style.zoom = 1;

element = hasLayout_IE($(element));
var filter = Element.getStyle(element, 'filter'),
style = element.style;
var filter = Element.getStyle(element, 'filter');

if (value == 1 || value === '') {
// Remove the `alpha` filter from IE's `filter` CSS property. If there
Expand All @@ -2980,7 +2979,7 @@
'alpha(opacity=' + (value * 100) + ')';

return element;
}
};


/**
Expand All @@ -2989,20 +2988,25 @@
* Returns the opacity of the element.
**/
function getOpacity(element) {
return Element.getStyle(element, 'opacity');
element = $(element);
// Try inline styles first.
var value = element.style.opacity;
if (!value || value === 'auto') {
// Reluctantly retrieve the computed style.
var css = document.defaultView.getComputedStyle(element, null);
value = css ? css.opacity : null;
}
return value ? parseFloat(value) : 1.0;
}

function getOpacity_IE(element) {
// Prefer the standard CSS approach unless it's not supported.
if (STANDARD_CSS_OPACITY_SUPPORTED)
return getOpacity(element);

// Prefer the standard CSS approach unless it's not supported.
var getOpacity_IE = STANDARD_CSS_OPACITY_SUPPORTED ? getOpacity : function(element) {
var filter = Element.getStyle(element, 'filter');
if (filter.length === 0) return 1.0;
var match = (filter || '').match(/alpha\(opacity=(.*)\)/);
if (match[1]) return parseFloat(match[1]) / 100;
return 1.0;
}
};


Object.extend(methods, {
Expand Down