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

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