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Move the .htc event listeners and event handling logic into an Elemen…
…t wrapper class, and add a couple public API methods which the .htc calls. Also enhance the build to create standalone .js files which can be used to programatically apply PIE to elements rather than having to use the behavior.
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Jason Johnston
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Aug 31, 2010
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,310 @@ | ||
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| PIE.Element = (function() { | ||
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| var wrappers = {}; | ||
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| function Element( el ) { | ||
| var lastW, lastH, lastX, lastY, | ||
| renderers, | ||
| styleInfos, | ||
| ancestors, | ||
| initializing, | ||
| initialized, | ||
| delayed; | ||
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| /** | ||
| * Initialize PIE for this element. | ||
| */ | ||
| function init() { | ||
| if( !initialized ) { | ||
| var doc = el.document, | ||
| docEl = doc.documentElement || doc.body, | ||
| rect, | ||
| rootRenderer; | ||
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| // Force layout so move/resize events will fire. Set this as soon as possible to avoid layout changes | ||
| // after load, but make sure it only gets called the first time through to avoid recursive calls to init(). | ||
| if( !initializing ) { | ||
| initializing = 1; | ||
| el.runtimeStyle.zoom = 1; | ||
| initFirstChildPseudoClass(); | ||
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| el.attachEvent( 'onmove', update ); | ||
| el.attachEvent( 'onresize', update ); | ||
| el.attachEvent( 'onpropertychange', propChanged ); | ||
| el.attachEvent( 'onmouseenter', mouseEntered ); | ||
| el.attachEvent( 'onmouseleave', mouseLeft ); | ||
| } | ||
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| rect = el.getBoundingClientRect(); | ||
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| // Check if the element is in the viewport; if not, delay initialization | ||
| if( rect.top > docEl.clientHeight || rect.left > docEl.clientWidth || rect.bottom < 0 || rect.right < 0 ) { | ||
| if( !delayed ) { | ||
| delayed = 1; | ||
| PIE.OnScroll.observe( init ); | ||
| } | ||
| } else { | ||
| initialized = 1; | ||
| delayed = initializing = 0; | ||
| PIE.OnScroll.unobserve( init ); | ||
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| // Create the style infos and renderers | ||
| styleInfos = { | ||
| backgroundInfo: new PIE.BackgroundStyleInfo( el ), | ||
| borderInfo: new PIE.BorderStyleInfo( el ), | ||
| borderImageInfo: new PIE.BorderImageStyleInfo( el ), | ||
| borderRadiusInfo: new PIE.BorderRadiusStyleInfo( el ), | ||
| boxShadowInfo: new PIE.BoxShadowStyleInfo( el ), | ||
| visibilityInfo: new PIE.VisibilityStyleInfo( el ) | ||
| }; | ||
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| rootRenderer = new PIE.RootRenderer( el, styleInfos ); | ||
| renderers = [ | ||
| rootRenderer, | ||
| new PIE.BoxShadowOutsetRenderer( el, styleInfos, rootRenderer ), | ||
| new PIE.BackgroundRenderer( el, styleInfos, rootRenderer ), | ||
| new PIE.BoxShadowInsetRenderer( el, styleInfos, rootRenderer ), | ||
| new PIE.BorderRenderer( el, styleInfos, rootRenderer ), | ||
| new PIE.BorderImageRenderer( el, styleInfos, rootRenderer ) | ||
| ]; | ||
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| // Add property change listeners to ancestors if requested | ||
| initAncestorPropChangeListeners(); | ||
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| // Add to list of polled elements in IE8 | ||
| if( PIE.ie8DocMode === 8 ) { | ||
| PIE.Heartbeat.observe( update ); | ||
| } | ||
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| // Listen for window resize events | ||
| PIE.OnResize.observe( update ); | ||
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| // Trigger rendering | ||
| update(); | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Update position and/or size as necessary. Both move and resize events call | ||
| * this rather than the updatePos/Size functions because sometimes, particularly | ||
| * during page load, one will fire but the other won't. | ||
| */ | ||
| function update() { | ||
| if( initialized ) { | ||
| /* TODO just using getBoundingClientRect may not always be accurate; it's possible that | ||
| an element will actually move relative to its positioning parent, but its position | ||
| relative to the viewport will stay the same. Need to come up with a better way to | ||
| track movement. The most accurate would be the same logic used in RootRenderer.updatePos() | ||
| but that is a more expensive operation since it does some DOM walking, and we want this | ||
| check to be as fast as possible. */ | ||
| var rect = el.getBoundingClientRect(), | ||
| x = rect.left, | ||
| y = rect.top, | ||
| w = rect.right - x, | ||
| h = rect.bottom - y, | ||
| i, len; | ||
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| if( x !== lastX || y !== lastY ) { | ||
| for( i = 0, len = renderers.length; i < len; i++ ) { | ||
| renderers[i].updatePos(); | ||
| } | ||
| lastX = x; | ||
| lastY = y; | ||
| } | ||
| if( w !== lastW || h !== lastH ) { | ||
| for( i = 0, len = renderers.length; i < len; i++ ) { | ||
| renderers[i].updateSize(); | ||
| } | ||
| lastW = w; | ||
| lastH = h; | ||
| } | ||
| } | ||
| else if( !initializing ) { | ||
| init(); | ||
| } | ||
| } | ||
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| /** | ||
| * Handle property changes to trigger update when appropriate. | ||
| */ | ||
| function propChanged() { | ||
| if( initialized ) { | ||
| var i, len, | ||
| toUpdate = []; | ||
| for( i = 0, len = renderers.length; i < len; i++ ) { | ||
| if( renderers[i].needsUpdate() ) { | ||
| toUpdate.push( renderers[i] ); | ||
| } | ||
| } | ||
| for( i = 0, len = toUpdate.length; i < len; i++ ) { | ||
| toUpdate[i].updateProps(); | ||
| } | ||
| } | ||
| else if( !initializing ) { | ||
| init(); | ||
| } | ||
| } | ||
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| /** | ||
| * Handle mouseenter events. Adds a custom class to the element to allow IE6 to add | ||
| * hover styles to non-link elements. | ||
| */ | ||
| function mouseEntered() { | ||
| if( PIE.ieVersion === 6 && el.tagName !== 'A' ) { | ||
| el.className += ' ' + PIE.CLASS_PREFIX + 'hover'; | ||
| } | ||
| //must delay this because the mouseleave event fires before the :hover styles are added. | ||
| setTimeout( propChanged, 0 ); | ||
| } | ||
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| /** | ||
| * Handle mouseleave events | ||
| */ | ||
| function mouseLeft() { | ||
| if( PIE.ieVersion === 6 && el.tagName !== 'A' ) { | ||
| el.className = el.className.replace( PIE.hoverClassRE, '' ); | ||
| } | ||
| //must delay this because the mouseleave event fires before the :hover styles are removed. | ||
| setTimeout( propChanged, 0 ); | ||
| } | ||
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| /** | ||
| * Handle property changes on ancestors of the element; see initAncestorPropChangeListeners() | ||
| * which adds these listeners as requested with the -pie-watch-ancestors CSS property. | ||
| */ | ||
| function ancestorPropChanged() { | ||
| var name = event.propertyName; | ||
| if( name === 'className' || name === 'id' ) { | ||
| propChanged(); | ||
| } | ||
| } | ||
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| /** | ||
| * Clean everything up when the behavior is removed from the element, or the element | ||
| * is destroyed. | ||
| */ | ||
| function destroy() { | ||
| var i, len; | ||
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| // destroy any active renderers | ||
| if( renderers ) { | ||
| for( i = 0, len = renderers.length; i < len; i++ ) { | ||
| renderers[i].destroy(); | ||
| } | ||
| renderers = null; | ||
| } | ||
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| styleInfos = null; | ||
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| // remove any ancestor propertychange listeners | ||
| if( ancestors ) { | ||
| for( i = 0, len = ancestors.length; i < len; i++ ) { | ||
| ancestors[i].detachEvent( 'onpropertychange', ancestorPropChanged ); | ||
| ancestors[i].detachEvent( 'onmouseenter', mouseEntered ); | ||
| ancestors[i].detachEvent( 'onmouseleave', mouseLeft ); | ||
| } | ||
| ancestors = null; | ||
| } | ||
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| // Remove from list of polled elements in IE8 | ||
| if( PIE.ie8DocMode === 8 ) { | ||
| PIE.Heartbeat.unobserve( update ); | ||
| } | ||
| // Stop onscroll/onresize listening | ||
| PIE.OnScroll.unobserve( update ); | ||
| PIE.OnResize.unobserve( update ); | ||
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| el.detachEvent( 'onmove', update ); | ||
| el.detachEvent( 'onresize', update ); | ||
| el.detachEvent( 'onpropertychange', propChanged ); | ||
| el.detachEvent( 'onmouseenter', mouseEntered ); | ||
| el.detachEvent( 'onmouseleave', mouseLeft ); | ||
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| } | ||
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| /** | ||
| * If requested via the custom -pie-watch-ancestors CSS property, add onpropertychange listeners | ||
| * to ancestor(s) of the element so we can pick up style changes based on CSS rules using | ||
| * descendant selectors. | ||
| */ | ||
| function initAncestorPropChangeListeners() { | ||
| var watch = el.currentStyle.getAttribute( PIE.CSS_PREFIX + 'watch-ancestors' ), | ||
| i, a; | ||
| if( watch ) { | ||
| ancestors = []; | ||
| watch = parseInt( watch, 10 ); | ||
| i = 0; | ||
| a = el.parentNode; | ||
| while( a && ( watch === 'NaN' || i++ < watch ) ) { | ||
| ancestors.push( a ); | ||
| a.attachEvent( 'onpropertychange', ancestorPropChanged ); | ||
| a.attachEvent( 'onmouseenter', mouseEntered ); | ||
| a.attachEvent( 'onmouseleave', mouseLeft ); | ||
| a = a.parentNode; | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * If the target element is a first child, add a pie_first-child class to it. This allows using | ||
| * the added class as a workaround for the fact that PIE's rendering element breaks the :first-child | ||
| * pseudo-class selector. | ||
| */ | ||
| function initFirstChildPseudoClass() { | ||
| var tmpEl = el, | ||
| isFirst = 1; | ||
| while( tmpEl = tmpEl.previousSibling ) { | ||
| if( tmpEl.nodeType === 1 ) { | ||
| isFirst = 0; | ||
| break; | ||
| } | ||
| } | ||
| if( isFirst ) { | ||
| el.className += ' ' + PIE.CLASS_PREFIX + 'first-child'; | ||
| } | ||
| } | ||
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| // Public methods - these are all already bound to this instance so there's no need to wrap them | ||
| // in a closure to maintain the 'this' scope object. | ||
| this.init = init; | ||
| this.update = update; | ||
| this.destroy = destroy; | ||
| } | ||
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| Element.getInstance = function( el ) { | ||
| var id = PIE.Util.getUID( el ); | ||
| return wrappers[ id ] || ( wrappers[ id ] = new Element( el ) ); | ||
| }; | ||
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| Element.destroy = function( el ) { | ||
| var id = PIE.Util.getUID( el ), | ||
| wrapper = wrappers[ id ]; | ||
| if( wrapper ) { | ||
| wrapper.destroy(); | ||
| delete wrappers[ id ]; | ||
| } | ||
| }; | ||
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| // Destroy all Element objects when leaving the page | ||
| window.attachEvent( 'onbeforeunload', function() { | ||
| if( wrappers ) { | ||
| for( var w in wrappers ) { | ||
| if( wrappers.hasOwnProperty( w ) ) { | ||
| wrappers[ w ].destroy(); | ||
| } | ||
| } | ||
| } | ||
| } ); | ||
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| return Element; | ||
| })(); | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| /** | ||
| * Create a single observable listener for window resize events. | ||
| */ | ||
| PIE.OnResize = new PIE.Observable(); | ||
| window.attachEvent( 'onresize', function() { PIE.OnResize.fire(); } ); |
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