mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/MultimediaViewer
synced 2024-11-25 08:35:29 +00:00
249 lines
8.2 KiB
JavaScript
249 lines
8.2 KiB
JavaScript
/*
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* This file is part of the MediaWiki extension MediaViewer.
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*
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* MediaViewer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* MediaViewer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MediaViewer. If not, see <http://www.gnu.org/licenses/>.
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*/
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( function () {
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var MPSP;
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/**
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* Handles scrolling behavior of the metadata panel.
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*
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* @class mw.mmv.ui.MetadataPanelScroller
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* @extends mw.mmv.ui.Element
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* @constructor
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* @param {jQuery} $container The container for the panel (.mw-mmv-post-image).
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* @param {jQuery} $aboveFold The control bar element (.mw-mmv-above-fold).
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* @param {mw.SafeStorage} localStorage the localStorage object, for dependency injection
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*/
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function MetadataPanelScroller( $container, $aboveFold, localStorage ) {
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mw.mmv.ui.Element.call( this, $container );
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this.$aboveFold = $aboveFold;
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/** @property {mw.SafeStorage} localStorage */
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this.localStorage = localStorage;
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/** @property {boolean} panelWasOpen state flag which will be used to detect open <-> closed transitions */
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this.panelWasOpen = null;
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/**
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* Whether this user has ever opened the metadata panel.
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* Based on a localstorage flag; will be set to true if the client does not support localstorage.
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* @type {boolean}
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*/
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this.hasOpenedMetadata = undefined;
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/**
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* Whether we've already fired an animation for the metadata div in this lightbox session.
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* @property {boolean}
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* @private
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*/
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this.hasAnimatedMetadata = false;
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this.initialize();
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}
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OO.inheritClass( MetadataPanelScroller, mw.mmv.ui.Element );
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MPSP = MetadataPanelScroller.prototype;
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MPSP.attach = function () {
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var panel = this;
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this.handleEvent( 'keydown', function ( e ) {
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panel.keydown( e );
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} );
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$( window ).on( 'scroll.mmvp', $.throttle( 250, function () {
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panel.scroll();
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} ) );
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this.$container.on( 'mmv-metadata-open', function () {
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if ( !panel.hasOpenedMetadata && panel.localStorage.store ) {
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panel.hasOpenedMetadata = true;
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panel.localStorage.set( 'mmv.hasOpenedMetadata', '1' );
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}
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} );
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// reset animation flag when the viewer is reopened
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this.hasAnimatedMetadata = false;
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};
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MPSP.unattach = function () {
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this.clearEvents();
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$( window ).off( 'scroll.mmvp' );
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this.$container.off( 'mmv-metadata-open' );
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};
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MPSP.empty = function () {
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// need to remove this to avoid animating again when reopening lightbox on same page
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this.$container.removeClass( 'invite' );
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this.panelWasOpen = this.panelIsOpen();
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};
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/**
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* Returns scroll top position when the panel is fully open.
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* (In other words, the height of the area that is outside the screen, in pixels.)
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*
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* @return {number}
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*/
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MPSP.getScrollTopWhenOpen = function () {
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return this.$container.outerHeight() - parseInt( this.$aboveFold.css( 'min-height' ), 10 ) -
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parseInt( this.$aboveFold.css( 'padding-bottom' ), 10 );
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};
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/**
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* Makes sure the panel does not contract when it is emptied and thus keeps its position as much as possible.
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* This should be called when switching images, before the panel is emptied, and should be undone with
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* unfreezeHeight after the panel has been populeted with the new metadata.
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*/
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MPSP.freezeHeight = function () {
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var scrollTop, scrollTopWhenOpen;
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if ( !this.$container.is( ':visible' ) ) {
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return;
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}
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scrollTop = $( window ).scrollTop();
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scrollTopWhenOpen = this.getScrollTopWhenOpen();
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this.panelWasFullyOpen = ( scrollTop === scrollTopWhenOpen );
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this.$container.css( 'min-height', this.$container.height() );
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};
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MPSP.unfreezeHeight = function () {
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if ( !this.$container.is( ':visible' ) ) {
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return;
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}
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this.$container.css( 'min-height', '' );
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if ( this.panelWasFullyOpen ) {
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$( window ).scrollTop( this.getScrollTopWhenOpen() );
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}
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};
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MPSP.initialize = function () {
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var value = this.localStorage.get( 'mmv.hasOpenedMetadata' );
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// localStorage will only store strings; if values `null`, `false` or
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// `0` are set, they'll come out as `"null"`, `"false"` or `"0"`, so we
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// can be certain that an actual null is a failure to locate the item,
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// and false is an issue with localStorage itself
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if ( value !== false ) {
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this.hasOpenedMetadata = value !== null;
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} else {
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// if there was an issue with localStorage, treat it as opened
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this.hasOpenedMetadata = true;
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}
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};
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/**
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* Animates the metadata area when the viewer is first opened.
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*/
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MPSP.animateMetadataOnce = function () {
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if ( !this.hasOpenedMetadata && !this.hasAnimatedMetadata ) {
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this.hasAnimatedMetadata = true;
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this.$container.addClass( 'invite' );
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}
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};
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/**
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* Toggles the metadata div being totally visible.
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*
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* @param {string} [forceDirection] 'up' or 'down' makes the panel move on that direction (and is a noop
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* if the panel is already at the upmost/bottommost position); without the parameter, the panel position
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* is toggled. (Partially open counts as open.)
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* @return {jQuery.Promise} A promise which resolves after the animation has finished.
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*/
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MPSP.toggle = function ( forceDirection ) {
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var scrollTopWhenOpen = this.getScrollTopWhenOpen(),
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scrollTopWhenClosed = 0,
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scrollTop = $( window ).scrollTop(),
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panelIsOpen = scrollTop > scrollTopWhenClosed,
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direction = forceDirection || ( panelIsOpen ? 'down' : 'up' ),
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scrollTopTarget = ( direction === 'up' ) ? scrollTopWhenOpen : scrollTopWhenClosed;
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// don't log / animate if the panel is already in the end position
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if ( scrollTopTarget === scrollTop ) {
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return $.Deferred().resolve().promise();
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} else {
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mw.mmv.actionLogger.log( direction === 'up' ? 'metadata-open' : 'metadata-close' );
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if ( direction === 'up' && !panelIsOpen ) {
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// FIXME nasty. This is not really an event but a command sent to the metadata panel;
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// child UI elements should not send commands to their parents. However, there is no way
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// to calculate the target scrollTop accurately without revealing the text, and the event
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// which does that (metadata-open) is only triggered later in the process, when the panel
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// actually scrolled, so we cannot use it here without risking triggering it multiple times.
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this.$container.trigger( 'mmv-metadata-reveal-truncated-text' );
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scrollTopTarget = this.getScrollTopWhenOpen();
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}
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// eslint-disable-next-line no-jquery/no-global-selector
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return $( 'html, body' ).animate( { scrollTop: scrollTopTarget }, 'fast' ).promise();
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}
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};
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/**
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* Handles keydown events for this element.
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*
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* @param {jQuery.Event} e Key down event
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*/
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MPSP.keydown = function ( e ) {
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if ( e.altKey || e.shiftKey || e.ctrlKey || e.metaKey ) {
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return;
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}
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switch ( e.which ) {
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case 40: // Down arrow
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// fall through
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case 38: // Up arrow
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this.toggle();
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e.preventDefault();
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break;
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}
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};
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/**
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* Returns whether the metadata panel is open. (Partially open is considered to be open.)
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*
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* @return {boolean}
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*/
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MPSP.panelIsOpen = function () {
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return $( window ).scrollTop() > 0;
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};
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/**
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* Receives the window's scroll events and and turns them into business logic events
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*
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* @fires mmv-metadata-open
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* @fires mmv-metadata-close
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*/
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MPSP.scroll = function () {
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var panelIsOpen = this.panelIsOpen();
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if ( panelIsOpen && !this.panelWasOpen ) { // just opened
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this.$container.trigger( 'mmv-metadata-open' );
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// This will include keyboard- and mouseclick-initiated open events as well,
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// since the panel is anomated, which counts as scrolling.
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// Filtering these seems too much trouble to be worth it.
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mw.mmv.actionLogger.log( 'metadata-scroll-open' );
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} else if ( !panelIsOpen && this.panelWasOpen ) { // just closed
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this.$container.trigger( 'mmv-metadata-close' );
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mw.mmv.actionLogger.log( 'metadata-scroll-close' );
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}
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this.panelWasOpen = panelIsOpen;
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};
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mw.mmv.ui.MetadataPanelScroller = MetadataPanelScroller;
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}() );
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