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/**
* Collapsible tabs jQuery Plugin
*/
( function ( $ ) {
var rtl = $( 'html' ).attr( 'dir' ) === 'rtl',
rAF = window.requestAnimationFrame || setTimeout;
$.fn.collapsibleTabs = function ( options ) {
// Merge options into the defaults
var settings = $.extend( {}, $.collapsibleTabs.defaults, options );
// return if the function is called on an empty jquery object
if ( !this.length ) {
return this;
}
this.each( function () {
var $el = $( this );
// add the element to our array of collapsible managers
$.collapsibleTabs.instances = $.collapsibleTabs.instances.add( $el );
// attach the settings to the elements
$el.data( 'collapsibleTabsSettings', settings );
// attach data to our collapsible elements
$el.children( settings.collapsible ).each( function () {
$.collapsibleTabs.addData( $( this ) );
} );
} );
// if we haven't already bound our resize handler, bind it now
if ( !$.collapsibleTabs.boundEvent ) {
$( window ).on( 'resize', $.debounce( 100, function () {
rAF( $.collapsibleTabs.handleResize );
} ) );
$.collapsibleTabs.boundEvent = true;
}
// call our resize handler to setup the page
rAF( $.collapsibleTabs.handleResize );
return this;
};
$.collapsibleTabs = {
instances: $( [] ),
boundEvent: null,
defaults: {
expandedContainer: '#p-views ul',
collapsedContainer: '#p-cactions ul',
collapsible: 'li.collapsible',
shifting: false,
expandCondition: function ( eleWidth ) {
// If there are at least eleWidth + 1 pixels of free space, expand.
// We add 1 because .width() will truncate fractional values but .offset() will not.
return $.collapsibleTabs.calculateTabDistance() >= eleWidth + 1;
},
collapseCondition: function () {
// If there's an overlap, collapse.
return $.collapsibleTabs.calculateTabDistance() < 0;
}
},
addData: function ( $collapsible ) {
var settings = $collapsible.parent().data( 'collapsibleTabsSettings' );
if ( settings ) {
$collapsible.data( 'collapsibleTabsSettings', {
expandedContainer: settings.expandedContainer,
collapsedContainer: settings.collapsedContainer,
expandedWidth: $collapsible.width(),
prevElement: $collapsible.prev()
} );
}
},
getSettings: function ( $collapsible ) {
var settings = $collapsible.data( 'collapsibleTabsSettings' );
if ( !settings ) {
$.collapsibleTabs.addData( $collapsible );
settings = $collapsible.data( 'collapsibleTabsSettings' );
}
return settings;
},
handleResize: function () {
$.collapsibleTabs.instances.each( function () {
var $el = $( this ),
data = $.collapsibleTabs.getSettings( $el );
if ( data.shifting ) {
return;
}
// if the two navigations are colliding
if ( $el.children( data.collapsible ).length > 0 && data.collapseCondition() ) {
$el.trigger( 'beforeTabCollapse' );
// move the element to the dropdown menu
$.collapsibleTabs.moveToCollapsed( $el.children( data.collapsible + ':last' ) );
}
// if there are still moveable items in the dropdown menu,
// and there is sufficient space to place them in the tab container
if ( $( data.collapsedContainer + ' ' + data.collapsible ).length > 0 &&
data.expandCondition( $.collapsibleTabs.getSettings( $( data.collapsedContainer ).children(
data.collapsible + ':first' ) ).expandedWidth ) ) {
// move the element from the dropdown to the tab
$el.trigger( 'beforeTabExpand' );
$.collapsibleTabs
.moveToExpanded( data.collapsedContainer + ' ' + data.collapsible + ':first' );
}
} );
},
moveToCollapsed: function ( ele ) {
var outerData, expContainerSettings, target,
$moving = $( ele );
outerData = $.collapsibleTabs.getSettings( $moving );
if ( !outerData ) {
return;
}
expContainerSettings = $.collapsibleTabs.getSettings( $( outerData.expandedContainer ) );
if ( !expContainerSettings ) {
return;
}
expContainerSettings.shifting = true;
// Remove the element from where it's at and put it in the dropdown menu
target = outerData.collapsedContainer;
$moving.css( 'position', 'relative' )
.css( ( rtl ? 'left' : 'right' ), 0 )
.animate( { width: '1px' }, 'normal', function () {
var data, expContainerSettings;
$( this ).hide();
// add the placeholder
$( '<span class="placeholder" style="display: none;"></span>' ).insertAfter( this );
$( this ).detach().prependTo( target ).data( 'collapsibleTabsSettings', outerData );
$( this ).attr( 'style', 'display: list-item;' );
data = $.collapsibleTabs.getSettings( $( ele ) );
if ( data ) {
expContainerSettings = $.collapsibleTabs.getSettings( $( data.expandedContainer ) );
if ( expContainerSettings ) {
expContainerSettings.shifting = false;
rAF( $.collapsibleTabs.handleResize );
}
}
} );
},
moveToExpanded: function ( ele ) {
var data, expContainerSettings, $target, expandedWidth,
$moving = $( ele );
data = $.collapsibleTabs.getSettings( $moving );
if ( !data ) {
return;
}
expContainerSettings = $.collapsibleTabs.getSettings( $( data.expandedContainer ) );
if ( !expContainerSettings ) {
return;
}
expContainerSettings.shifting = true;
// grab the next appearing placeholder so we can use it for replacing
$target = $( data.expandedContainer ).find( 'span.placeholder:first' );
expandedWidth = data.expandedWidth;
$moving.css( 'position', 'relative' ).css( ( rtl ? 'right' : 'left' ), 0 ).css( 'width', '1px' );
$target.replaceWith(
$moving
.detach()
.css( 'width', '1px' )
.data( 'collapsibleTabsSettings', data )
.animate( { width: expandedWidth + 'px' }, 'normal', function () {
var data, expContainerSettings;
$( this ).attr( 'style', 'display: block;' );
data = $.collapsibleTabs.getSettings( $( this ) );
if ( data ) {
expContainerSettings = $.collapsibleTabs.getSettings( $( data.expandedContainer ) );
if ( expContainerSettings ) {
expContainerSettings.shifting = false;
rAF( $.collapsibleTabs.handleResize );
}
}
} )
);
},
/**
* Returns the amount of horizontal distance between the two tabs groups
* (#left-navigation and #right-navigation), in pixels. If negative, this
* means that the tabs overlap, and the value is the width of overlapping
* parts.
*
* Used in default expandCondition and collapseCondition.
*
* @return {Numeric} distance/overlap in pixels
*/
calculateTabDistance: function () {
var $leftTab, $rightTab, leftEnd, rightStart;
// In RTL, #right-navigation is actually on the left and vice versa.
// Hooray for descriptive naming.
if ( !rtl ) {
$leftTab = $( '#left-navigation' );
$rightTab = $( '#right-navigation' );
} else {
$leftTab = $( '#right-navigation' );
$rightTab = $( '#left-navigation' );
}
leftEnd = $leftTab.offset().left + $leftTab.width();
rightStart = $rightTab.offset().left;
return rightStart - leftEnd;
}
};
}( jQuery ) );
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