117 lines
4.4 KiB
JavaScript
117 lines
4.4 KiB
JavaScript
/**
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* Collapsible tabs for Vector
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*/
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/* eslint-disable no-jquery/no-global-selector */
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$( function () {
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var $cactions = $( '#p-cactions' ),
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$tabContainer = $( '#p-views ul' ),
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initialCactionsWidth = function () {
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// HACK: This depends on a discouraged feature of jQuery width().
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// The #p-cactions element is generally hidden by default, but
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// the consumers of this function need to know the width that the
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// "More" menu would consume if it were visible. This means it
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// must not return 0 if hidden, but rather virtually render it
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// and compute its width, then hide it again. jQuery width() does
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// all that for us.
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var width = $cactions.width() || 0;
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initialCactionsWidth = function () {
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return width;
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};
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return width;
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};
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// Bind callback functions to animate our drop down menu in and out
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// and then call the collapsibleTabs function on the menu
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$tabContainer
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.on( 'beforeTabCollapse', function () {
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var expandedWidth;
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// If the dropdown was hidden, show it
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// eslint-disable-next-line no-jquery/no-class-state
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if ( $cactions.hasClass( 'emptyPortlet' ) ) {
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$cactions.removeClass( 'emptyPortlet' );
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// Now that it is visible, force-render it virtually
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// to get its expanded width, then shrink it 1px before we
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// yield from JS (which means the expansion won't be visible).
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// Then animate from the 1px to the expanded width.
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expandedWidth = $cactions.width();
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// eslint-disable-next-line no-jquery/no-animate
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$cactions.find( 'h3' )
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.css( 'width', '1px' )
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.animate( { width: expandedWidth }, 'normal' );
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}
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} )
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.on( 'beforeTabExpand', function () {
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// If we're removing the last child node right now, hide the dropdown
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if ( $cactions.find( 'li' ).length === 1 ) {
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// eslint-disable-next-line no-jquery/no-animate
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$cactions.find( 'h3' ).animate( { width: '1px' }, 'normal', function () {
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$( this ).attr( 'style', '' )
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.parent().addClass( 'emptyPortlet' );
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} );
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}
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} )
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.collapsibleTabs( {
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expandCondition: function ( eleWidth ) {
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// This looks a bit awkward because we're doing expensive queries as late
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// as possible.
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var distance = $.collapsibleTabs.calculateTabDistance();
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// If there are at least eleWidth + 1 pixels of free space, expand.
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// We add 1 because .width() will truncate fractional values but .offset() will not.
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if ( distance >= eleWidth + 1 ) {
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return true;
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} else {
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// Maybe we can still expand? Account for the width of the "Actions" dropdown
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// if the expansion would hide it.
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if ( $cactions.find( 'li' ).length === 1 ) {
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return distance >= eleWidth + 1 - initialCactionsWidth();
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} else {
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return false;
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}
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}
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},
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collapseCondition: function () {
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var collapsibleWidth = 0,
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doCollapse = false;
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// This looks a bit awkward because we're doing expensive queries as late
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// as possible.
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// TODO: The dropdown itself should probably "fold" to just the down-arrow
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// (hiding the text) if it can't fit on the line?
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// Never collapse if there is no overlap.
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if ( $.collapsibleTabs.calculateTabDistance() >= 0 ) {
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return false;
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}
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// Always collapse if the "More" button is already shown.
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// eslint-disable-next-line no-jquery/no-class-state
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if ( !$cactions.hasClass( 'emptyPortlet' ) ) {
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return true;
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}
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// If we reach here, this means:
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// 1. #p-cactions is currently empty and invisible (e.g. when logged out),
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// 2. and, there is at least one li.collapsible link in #p-views, as asserted
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// by handleResize() before calling here. Such link exists e.g. as
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// "View history" on articles, but generally not on special pages.
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// 3. and, the left-navigation and right-navigation are overlapping
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// each other, e.g. when making the window very narrow, or if a gadget
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// added a lot of tabs.
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$tabContainer.children( 'li.collapsible' ).each( function ( _index, element ) {
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collapsibleWidth += $( element ).width() || 0;
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if ( collapsibleWidth > initialCactionsWidth() ) {
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// We've found one or more collapsible links that are wider
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// than the "More" menu would be if it were made visible,
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// which means it is worth doing a collapsing.
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doCollapse = true;
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// Stop this possibly expensive loop the moment the condition is met once.
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return false;
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}
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return;
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} );
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return doCollapse;
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}
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} );
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} );
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