mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/MultimediaViewer
synced 2024-09-29 13:17:35 +00:00
d66509e2de
Many users right-click on images as a way to download them.Due to this, they may get a scaled-down version which is used for display purposes and also not given guidance on how to attribute. Bug: T75999 Change-Id: I30655a0dda4430b494a393f1fa708fce6ca6fafe
432 lines
13 KiB
JavaScript
432 lines
13 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( mw, $, oo ) {
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var C;
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/**
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* UI component that contains the multimedia element to be displayed.
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* This first version assumes an image but it can be extended to other
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* media types (video, sound, presentation, etc.).
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*
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* @class mw.mmv.ui.Canvas
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* @extends mw.mmv.ui.Element
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* @constructor
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* @param {jQuery} $container Canvas' container
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* @param {jQuery} $imageWrapper
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* @param {jQuery} $mainWrapper
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*/
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function Canvas( $container, $imageWrapper, $mainWrapper ) {
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mw.mmv.ui.Element.call( this, $container );
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/**
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* @property {boolean}
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* @private
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*/
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this.dialogOpen = false;
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/**
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* @property {mw.mmv.ThumbnailWidthCalculator}
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* @private
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*/
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this.thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator();
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/**
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* Contains image.
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* @property {jQuery}
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*/
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this.$imageDiv = $( '<div>' )
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.addClass( 'mw-mmv-image' );
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this.$imageDiv.appendTo( this.$container );
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/**
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* Container of canvas and controls, needed for canvas size calculations.
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* @property {jQuery}
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* @private
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*/
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this.$imageWrapper = $imageWrapper;
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/**
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* Main container of image and metadata, needed to propagate events.
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* @property {jQuery}
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* @private
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*/
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this.$mainWrapper = $mainWrapper;
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/**
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* Raw metadata of current image, needed for canvas size calculations.
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* @property {mw.mmv.LightboxImage}
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* @private
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*/
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this.imageRawMetadata = null;
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}
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oo.inheritClass( Canvas, mw.mmv.ui.Element );
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C = Canvas.prototype;
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/**
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* Maximum blownup factor tolerated
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* @property MAX_BLOWUP_FACTOR
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* @static
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*/
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Canvas.MAX_BLOWUP_FACTOR = 11;
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/**
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* Blowup factor threshold at which blurring kicks in
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* @property BLUR_BLOWUP_FACTOR_THRESHOLD
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* @static
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*/
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Canvas.BLUR_BLOWUP_FACTOR_THRESHOLD = 2;
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/**
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* Clears everything.
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*/
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C.empty = function() {
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this.$imageDiv.addClass( 'empty' ).removeClass( 'error' );
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this.$imageDiv.empty();
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};
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/**
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* Sets contained image.
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* @param {mw.mmv.LightboxImage} imageRawMetadata
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* @param {jQuery} $imageElement
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*/
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C.set = function( imageRawMetadata, $imageElement ) {
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this.$imageDiv.removeClass( 'empty' );
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this.imageRawMetadata = imageRawMetadata;
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this.$image = $imageElement;
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this.setUpImageClick();
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this.$imageDiv.html( this.$image );
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};
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/**
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* Sets max-width and max-height of the image equal to those of its parent element.
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* FIXME what is this good for, actually?
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*/
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C.setImageMaxDimensions = function() {
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this.$image.css( {
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maxWidth : this.$image.parent().width(),
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// for height, use closest ancestor which has non-content-defined height;
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// otherwise this could be determined by the height of the image.
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maxHeight : this.$imageWrapper.height()
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} );
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};
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/**
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* Sets contained image and also the max dimensions. Called while resizing the viewer.
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* Assumes set function called before.
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* @param {mw.mmv.model.Thumbnail} thumbnail thumbnail information
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* @param {HTMLImageElement} imageElement
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* @param {mw.mmv.model.ThumbnailWidth} imageWidths
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*/
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C.setImageAndMaxDimensions = function( thumbnail, imageElement, imageWidths ) {
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var $image = $( imageElement );
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// we downscale larger images but do not scale up smaller ones, that would look ugly
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if ( thumbnail.width > imageWidths.cssWidth ) {
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imageElement.width = imageWidths.cssWidth;
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}
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if ( !this.$image.is( imageElement ) ) { // http://bugs.jquery.com/ticket/4087
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this.$image.replaceWith( $image );
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this.$image = $image;
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// Since the image element got replaced, we need to rescue the dialog-open class.
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this.$image.toggleClass( 'mw-mmv-dialog-is-open', this.dialogOpen );
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this.setUpImageClick();
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}
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this.setImageMaxDimensions();
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};
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/**
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* Handles a "dialog open/close" event from dialogs on the page.
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*/
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C.handleDialogEvent = function ( e ) {
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switch ( e.type ) {
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case 'mmv-download-opened':
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this.downloadOpen = true;
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break;
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case 'mmv-download-closed':
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this.downloadOpen = false;
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break;
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case 'mmv-reuse-opened':
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this.reuseOpen = true;
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break;
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case 'mmv-reuse-closed':
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this.reuseOpen = false;
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break;
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case 'mmv-options-opened':
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this.optionsOpen = true;
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break;
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case 'mmv-options-closed':
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this.optionsOpen = false;
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break;
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}
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this.dialogOpen = this.reuseOpen || this.downloadOpen || this.optionsOpen;
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this.$image.toggleClass( 'mw-mmv-dialog-is-open', this.dialogOpen );
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};
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/**
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* Registers click listener on the image.
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*/
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C.setUpImageClick = function () {
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var canvas = this;
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this.handleEvent( 'mmv-reuse-opened', $.proxy( this.handleDialogEvent, this ) );
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this.handleEvent( 'mmv-reuse-closed', $.proxy( this.handleDialogEvent, this ) );
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this.handleEvent( 'mmv-download-opened', $.proxy( this.handleDialogEvent, this ) );
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this.handleEvent( 'mmv-download-closed', $.proxy( this.handleDialogEvent, this ) );
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this.handleEvent( 'mmv-options-opened', $.proxy( this.handleDialogEvent, this ) );
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this.handleEvent( 'mmv-options-closed', $.proxy( this.handleDialogEvent, this ) );
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this.$image.on( 'click.mmv-canvas', function ( e ) {
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// ignore clicks if the metadata panel or one of the dialogs is open - assume the intent is to
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// close it in this case; that will be handled elsewhere
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if (
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!canvas.dialogOpen
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// FIXME a UI component should not know about its parents
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&& canvas.$container.closest( '.metadata-panel-is-open').length === 0
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) {
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e.stopPropagation(); // don't let $imageWrapper handle this
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mw.mmv.actionLogger.log( 'view-original-file' ).always( function() {
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$( document ).trigger( 'mmv-viewfile' );
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} );
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}
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} );
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// open the download panel on right clicking the image
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this.$image.on( 'mousedown.mmv-canvas', function ( e ) {
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if ( e.which === 3 ) {
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mw.mmv.actionLogger.log( 'right-click-image' );
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if ( !canvas.downloadOpen ) {
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$( document ).trigger( 'mmv-download-open', e );
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e.stopPropagation();
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}
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}
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} );
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};
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/**
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* Registers listeners.
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*/
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C.attach = function() {
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var canvas = this;
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$( window ).on( 'resize.mmv-canvas', $.debounce( 100, function () {
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canvas.$mainWrapper.trigger( $.Event( 'mmv-resize-end' ) );
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} ) );
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this.$imageWrapper.on( 'click.mmv-canvas', function () {
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if ( canvas.$container.closest( '.metadata-panel-is-open').length > 0 ) {
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canvas.$mainWrapper.trigger( 'mmv-panel-close-area-click' );
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}
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} );
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};
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/**
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* Clears listeners.
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*/
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C.unattach = function() {
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this.clearEvents();
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$( window ).off( 'resize.mmv-canvas' );
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this.$imageWrapper.off( 'click.mmv-canvas' );
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};
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/**
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* Sets page thumbnail for display if blowupFactor <= MAX_BLOWUP_FACTOR. Otherwise thumb is not set.
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* The image gets also blured to avoid pixelation if blowupFactor > BLUR_BLOWUP_FACTOR_THRESHOLD.
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* We set SVG files to the maximum screen size available.
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* Assumes set function called before.
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*
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* @param {{width: number, height: number}} size
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* @param {jQuery} $imagePlaceholder Image placeholder to be displayed while the real image loads.
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* @param {mw.mmv.model.ThumbnailWidth} imageWidths
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* @returns {boolean} Whether the image was blured or not
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*/
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C.maybeDisplayPlaceholder = function ( size, $imagePlaceholder, imageWidths ) {
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var targetWidth,
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targetHeight,
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blowupFactor,
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blurredThumbnailShown = false;
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// Assume natural thumbnail size¸
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targetWidth = size.width;
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targetHeight = size.height;
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// If the image is bigger than the screen we need to resize it
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if ( size.width > imageWidths.cssWidth ) { // This assumes imageInfo.width in CSS units
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targetWidth = imageWidths.cssWidth;
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targetHeight = imageWidths.cssHeight;
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}
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blowupFactor = targetWidth / $imagePlaceholder.width();
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// If the placeholder is too blown up, it's not worth showing it
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if ( blowupFactor > Canvas.MAX_BLOWUP_FACTOR ) {
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return blurredThumbnailShown;
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}
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$imagePlaceholder.width( targetWidth );
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$imagePlaceholder.height( targetHeight );
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// Only blur the placeholder if it's blown up significantly
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if ( blowupFactor > Canvas.BLUR_BLOWUP_FACTOR_THRESHOLD ) {
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this.blur( $imagePlaceholder );
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blurredThumbnailShown = true;
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}
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this.set( this.imageRawMetadata, $imagePlaceholder.show() );
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return blurredThumbnailShown;
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};
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/**
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* Blur image
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* @param {jQuery} $image Image to be blurred.
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*/
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C.blur = function( $image ) {
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// We have to apply the SVG filter here, it doesn't work when defined in the .less file
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// We can't use an external SVG file because filters can't be accessed cross-domain
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// We can't embed the SVG file because accessing the filter inside of it doesn't work
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$image.addClass( 'blurred' ).css( 'filter', 'url("#gaussian-blur")' );
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};
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/**
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* Animates the image into focus
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*/
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C.unblurWithAnimation = function() {
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var self = this,
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animationLength = 300;
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// The blurred class has an opacity < 1. This animated the image to become fully opaque
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this.$image
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.addClass( 'blurred' )
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.animate( { opacity: 1.0 }, animationLength );
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// During the same amount of time (animationLength) we animate a blur value from 3.0 to 0.0
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// We pass that value to an inline CSS Gaussian blur effect
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$( { blur: 3.0 } ).animate( { blur: 0.0 }, {
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duration: animationLength,
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step: function ( step ) {
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self.$image.css( { '-webkit-filter' : 'blur(' + step + 'px)',
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'filter' : 'blur(' + step + 'px)' } );
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},
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complete: function () {
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// When the animation is complete, the blur value is 0, clean things up
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self.unblur();
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}
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} );
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};
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C.unblur = function() {
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// We apply empty CSS values to remove the inline styles applied by jQuery
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// so that they don't get in the way of styles defined in CSS
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this.$image.css( { '-webkit-filter' : '', 'opacity' : '', 'filter' : '' } )
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.removeClass( 'blurred' );
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};
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/**
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* Displays a message and error icon when loading the image fails.
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* @param {string} error error message
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*/
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C.showError = function ( error ) {
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this.$imageDiv.empty()
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.addClass( 'error' )
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.append(
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$( '<div>' ).addClass( 'mw-mmv-error-text' ).text(
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mw.message( 'multimediaviewer-thumbnail-error', error ).text()
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)
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);
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};
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/**
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* Returns width and height of the canvas area (i.e. the space available for the image).
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* @param {boolean} forFullscreen if true, return size in fullscreen mode; otherwise, return current size
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* (which might still be fullscreen mode).
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* @return {{width: Number, height: Number}} width and height in CSS pixels
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*/
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C.getDimensions = function ( forFullscreen ) {
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var $window = $( window ),
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$aboveFold = $( '.mw-mmv-above-fold' ),
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isFullscreened = !!$aboveFold.closest( '.jq-fullscreened' ).length,
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// Don't rely on this.$imageWrapper's sizing because it's fragile.
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// Depending on what the wrapper contains, its size can be 0 on some browsers.
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// Therefore, we calculate the available space manually
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availableWidth = $window.width(),
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availableHeight = $window.height() - ( isFullscreened ? 0 : $aboveFold.height() );
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if ( forFullscreen ) {
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return {
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width: screen.width,
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height: screen.height
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};
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} else {
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return {
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width: availableWidth,
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height: availableHeight
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};
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}
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};
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/**
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* Gets the widths for a given lightbox image.
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* @param {mw.mmv.LightboxImage} image
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* @returns {mw.mmv.model.ThumbnailWidth}
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*/
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C.getLightboxImageWidths = function ( image ) {
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var thumb = image.thumbnail,
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canvasDimensions = this.getDimensions();
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return this.thumbnailWidthCalculator.calculateWidths(
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canvasDimensions.width, canvasDimensions.height, thumb.width, thumb.height );
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};
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/**
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* Gets the fullscreen widths for a given lightbox image.
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* Intended for use before the viewer is in fullscreen mode
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* (in fullscreen mode getLightboxImageWidths() works fine).
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* @param {mw.mmv.LightboxImage} image
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* @returns {mw.mmv.model.ThumbnailWidth}
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*/
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C.getLightboxImageWidthsForFullscreen = function ( image ) {
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var thumb = image.thumbnail,
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canvasDimensions = this.getDimensions( true );
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return this.thumbnailWidthCalculator.calculateWidths(
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canvasDimensions.width, canvasDimensions.height, thumb.width, thumb.height );
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};
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/**
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* Gets the widths for the current lightbox image.
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* @returns {mw.mmv.model.ThumbnailWidth}
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*/
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C.getCurrentImageWidths = function () {
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return this.getLightboxImageWidths( this.imageRawMetadata );
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};
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mw.mmv.ui.Canvas = Canvas;
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}( mediaWiki, jQuery, OO ) );
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