498 lines
14 KiB
JavaScript
498 lines
14 KiB
JavaScript
window.wp = window.wp || {};
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(function($) {
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var revisions;
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revisions = wp.revisions = { model: {}, view: {}, controller: {} };
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// Link settings.
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revisions.settings = typeof _wpRevisionsSettings === 'undefined' ? {} : _wpRevisionsSettings;
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/**
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* ========================================================================
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* MODELS
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* ========================================================================
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*/
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revisions.model.Slider = Backbone.Model.extend({
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defaults: {
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value: 0,
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min: 0,
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max: 1,
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step: 1
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}
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});
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revisions.model.Revision = Backbone.Model.extend({});
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revisions.model.Revisions = Backbone.Collection.extend({
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model: revisions.model.Revision,
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comparator: function( revision ) {
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return revision.id;
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},
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});
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revisions.model.Field = Backbone.Model.extend({});
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revisions.model.Fields = Backbone.Collection.extend({
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model: revisions.model.Field
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});
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revisions.model.Diff = Backbone.Model.extend({
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initialize: function(attributes, options) {
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var fields = this.get('fields');
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this.unset('fields');
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this.fields = new revisions.model.Fields( fields );
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}
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});
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revisions.model.Diffs = Backbone.Collection.extend({
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initialize: function(models, options) {
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this.revisions = options.revisions;
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this.requests = {};
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},
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model: revisions.model.Diff,
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ensure: function( id, context ) {
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var diff = this.get( id );
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var request = this.requests[ id ];
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var deferred = $.Deferred();
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var ids = {};
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if ( diff ) {
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deferred.resolveWith( context, [ diff ] );
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} else {
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this.trigger( 'ensure:load', ids );
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_.each( ids, _.bind( function(id) {
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// Remove anything that has an ongoing request
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if ( this.requests[ id ] )
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delete ids[ id ];
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}, this ) );
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if ( ! request ) {
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// Always include the ID that started this ensure
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ids[ id ] = true;
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request = this.load( _.keys( ids ) );
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}
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request.done( _.bind( function() {
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deferred.resolveWith( context, [ this.get( id ) ] );
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}, this ) );
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}
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return deferred.promise();
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},
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loadNew: function( comparisons ) {
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comparisons = _.object( comparisons, comparisons );
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_.each( comparisons, _.bind( function( id ) {
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// Exists
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if ( this.get( id ) )
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delete comparisons[ id ];
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}, this ) );
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comparisons = _.toArray( comparisons );
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return this.load( comparisons );
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},
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load: function( comparisons ) {
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// Our collection should only ever grow, never shrink, so remove: false
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return this.fetch({ data: { compare: comparisons }, remove: false });
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},
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/**/
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loadLast: function( num ) {
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num = num || 1;
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var ids = this.getProximalDiffIds();
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ids = _.last( ids, num );
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if ( ids.length ) {
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return this.loadNew( ids );
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}
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},
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loadLastUnloaded: function( num ) {
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num = num || 1;
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var ids = this.getUnloadedProximalDiffIds();
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ids = _.last( ids, num );
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if ( ids.length ) {
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return this.loadNew( ids );
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}
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},
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getProximalDiffIds: function() {
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var previous = 0, ids = [];
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this.revisions.each( _.bind( function(revision) {
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ids.push( previous + ':' + revision.id );
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previous = revision.id;
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}, this ) );
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return ids;
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},
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getUnloadedProximalDiffIds: function() {
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var comparisons = this.getProximalDiffIds();
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comparisons = _.object( comparisons, comparisons );
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_.each( comparisons, _.bind( function( id ) {
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// Exists
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if ( this.get( id ) )
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delete comparisons[ id ];
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}, this ) );
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return _.toArray( comparisons );
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},
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loadAllBy: function( chunkSize ) {
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chunkSize = chunkSize || 20;
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var unloaded = this.getUnloadedProximalDiffIds();
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if ( unloaded.length ) {
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return this.loadLastUnloaded( chunkSize ).always( _.bind( function() {
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this.loadAllBy( chunkSize );
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}, this ) );
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}
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},
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sync: function( method, model, options ) {
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if ( 'read' === method ) {
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options = options || {};
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options.context = this;
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options.data = _.extend( options.data || {}, {
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action: 'get-revision-diffs',
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post_id: revisions.settings.postId
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});
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var deferred = wp.xhr.send( options );
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var requests = this.requests;
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// Record that we're requesting each diff.
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if ( options.data.compare ) {
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_.each( options.data.compare, function( id ) {
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requests[ id ] = deferred;
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});
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}
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// When the request completes, clear the stored request.
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deferred.always( function() {
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if ( options.data.compare ) {
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_.each( options.data.compare, function( id ) {
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delete requests[ id ];
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});
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}
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});
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return deferred;
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// Otherwise, fall back to `Backbone.sync()`.
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} else {
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return Backbone.Model.prototype.sync.apply( this, arguments );
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}
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}
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});
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revisions.model.FrameState = Backbone.Model.extend({
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initialize: function( attributes, options ) {
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this.revisions = options.revisions;
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this.diffs = new revisions.model.Diffs( [], {revisions: this.revisions} );
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this.listenTo( this, 'change:from change:to', this.updateDiffId );
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},
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updateDiffId: function() {
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var from = this.get( 'from' );
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var to = this.get( 'to' );
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this.set( 'diffId', (from ? from.id : '0') + ':' + to.id );
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}
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});
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/**
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* ========================================================================
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* VIEWS
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* ========================================================================
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*/
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// The frame view. This contains the entire page.
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revisions.view.Frame = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'revisions',
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template: wp.template('revisions-frame'),
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initialize: function() {
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this.model = new revisions.model.FrameState({}, {
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revisions: this.collection
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});
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this.listenTo( this.model, 'change:diffId', this.updateDiff );
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this.views.set( '.revisions-control-frame', new revisions.view.Controls({
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model: this.model
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}) );
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if ( this.model.revisions.length ) {
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var last = this.model.revisions.last(2);
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var attributes = { to: last.pop() };
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if ( last.length )
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attributes.from = last.pop();
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this.model.set( attributes );
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// Load the rest: first 10, then the rest by 50
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this.model.diffs.loadLastUnloaded( 10 ).always( _.bind( function() {
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this.model.diffs.loadAllBy( 50 );
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}, this ) );
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}
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},
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render: function() {
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wp.Backbone.View.prototype.render.apply( this, arguments );
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$('#wpbody-content .wrap').append( this.el );
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this.views.ready();
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return this;
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},
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updateDiff: function() {
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this.model.diffs.ensure( this.model.get('diffId'), this ).done( function( diff ) {
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if ( this.model.get('diffId') !== diff.id )
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return;
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this.views.set( '.revisions-diff-frame', new revisions.view.Diff({
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model: diff
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}));
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});
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}
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});
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// The control view.
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// This contains the revision slider, previous/next buttons, and the compare checkbox.
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revisions.view.Controls = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'revisions-controls',
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initialize: function() {
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// Add the button view
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this.views.add( new revisions.view.Buttons({
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model: this.model
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}));
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// Add the Slider view
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this.views.add( new revisions.view.Slider({
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model: this.model
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}) );
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// Add the Meta view
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this.views.add( new revisions.view.Meta({
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model: this.model
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}) );
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}
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});
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// The meta view.
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// This contains the revision meta, and the restore button.
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revisions.view.Meta = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'revisions-meta',
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template: wp.template('revisions-meta'),
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initialize: function() {
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this.listenTo( this.model, 'change:diffId', this.updateMeta );
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},
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events: {
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'click #restore-revision': 'restoreRevision'
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},
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restoreRevision: function() {
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var restoreUrl = this.model.get('to').attributes.restoreUrl.replace(/&/g, '&');
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document.location = restoreUrl;
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},
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updateMeta: function() {
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this.$el.html( this.template( this.model.toJSON() ) );
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if( this.model.get( 'to' ).attributes.current ) {
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$( '#restore-revision' ).prop( 'disabled', true);
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} else {
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$( '#restore-revision' ).prop( 'disabled', false)
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}
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}
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});
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// The buttons view.
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// Encapsulates all of the configuration for the previous/next buttons, and the compare checkbox.
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revisions.view.Buttons = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'revisions-buttons',
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template: wp.template('revisions-controls'),
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initialize: function() {
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this.$el.html( this.template() )
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},
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events: {
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'click #next': 'nextRevision',
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'click #previous': 'previousRevision'
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},
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gotoModel: function( toIndex ) {
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var attributes = {
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to: this.model.revisions.at( isRtl ? this.model.revisions.length - toIndex - 1 : toIndex ) // Reverse directions for Rtl
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};
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// If we're at the first revision, unset 'from'.
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if ( isRtl ? this.model.revisions.length - toIndex - 1 : toIndex ) // Reverse directions for Rtl
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attributes.from = this.model.revisions.at( isRtl ? this.model.revisions.length - toIndex - 2 : toIndex - 1 );
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else
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this.model.unset('from', { silent: true });
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this.model.set( attributes );
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},
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nextRevision: function() {
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var toIndex = this.model.revisions.indexOf( this.model.get( 'to' ) );
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toIndex = isRtl ? toIndex - 1 : toIndex + 1;
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this.gotoModel( toIndex );
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},
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previousRevision: function() {
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var toIndex = this.model.revisions.indexOf( this.model.get('to') );
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toIndex = isRtl ? toIndex + 1 : toIndex - 1;
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this.gotoModel( toIndex );
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},
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ready: function() {
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this.listenTo( this.model, 'change:diffId', this.disabledButtonCheck );
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},
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// Check to see if the Previous or Next buttons need to be disabled or enabled
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disabledButtonCheck: function() {
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var maxVal = isRtl ? 0 : this.model.revisions.length - 1,
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minVal = isRtl ? this.model.revisions.length - 1 : 0,
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next = $( '.revisions-next .button' ),
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previous = $( '.revisions-previous .button' ),
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val = this.model.revisions.indexOf( this.model.get( 'to' ) );
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// Disable "Next" button if you're on the last node
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if ( maxVal === val )
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next.prop( 'disabled', true );
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else
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next.prop( 'disabled', false );
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// Disable "Previous" button if you're on the first node
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if ( minVal === val )
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previous.prop( 'disabled', true );
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else
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previous.prop( 'disabled', false );
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},
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});
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// The slider view.
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// Encapsulates all of the configuration for the jQuery UI slider into a view.
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revisions.view.Slider = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'wp-slider',
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initialize: function() {
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_.bindAll( this, 'start', 'slide', 'stop' );
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// Create the slider model from the provided collection data.
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// TODO: This should actually pull from the model's `to` key.
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var latestRevisionIndex = this.model.revisions.length - 1;
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// Find the initially selected revision
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var initiallySelectedRevisionIndex =
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this.model.revisions.indexOf(
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this.model.revisions.findWhere( { id: Number( revisions.settings.selectedRevision ) } ) );
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this.settings = new revisions.model.Slider({
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max: latestRevisionIndex,
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value: initiallySelectedRevisionIndex,
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start: this.start,
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slide: this.slide,
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stop: this.stop
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});
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},
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ready: function() {
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this.$el.slider( this.settings.toJSON() );
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this.settings.on( 'change', function( model, options ) {
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// Apply changes to slider settings here.
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this.$el.slider( { value: this.model.revisions.indexOf( this.model.get( 'to' ) ) } ); // Set handle to current to model
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}, this );
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// Reset to the initially selected revision
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this.slide( '', this.settings.attributes );
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// Listen for changes in the diffId
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this.listenTo( this.model, 'change:diffId', this.diffIdChanged );
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},
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diffIdChanged: function() {
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// Reset the view settings when diffId is changed
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this.settings.set( { 'value': this.model.revisions.indexOf( this.model.get( 'to' ) ) } );
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},
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start: function( event, ui ) {
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// Track the mouse position to enable smooth dragging, overrides default jquery ui step behaviour
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$( window ).mousemove( function( e ) {
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var sliderLeft = $( '.wp-slider' ).offset().left,
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sliderRight = sliderLeft + $( '.wp-slider' ).width();
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// Follow mouse movements, as long as handle remains inside slider
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if ( e.clientX < sliderLeft ) {
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$( ui.handle ).css( 'left', 0 ); // Mouse to left of slider
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} else if ( e.clientX > sliderRight ) {
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$( ui.handle ).css( 'left', sliderRight - sliderLeft); // Mouse to right of slider
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} else {
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$( ui.handle ).css( 'left', e.clientX - sliderLeft ); // Mouse in slider
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}
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} ); // End mousemove
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},
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slide: function( event, ui ) {
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var attributes = {
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to: this.model.revisions.at( isRtl ? this.model.revisions.length - ui.value - 1 : ui.value ) // Reverse directions for Rtl
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};
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// If we're at the first revision, unset 'from'.
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if ( isRtl ? this.model.revisions.length - ui.value - 1 : ui.value ) // Reverse directions for Rtl
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attributes.from = this.model.revisions.at( isRtl ? this.model.revisions.length - ui.value - 2 : ui.value - 1 );
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else
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this.model.unset('from', { silent: true });
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this.model.set( attributes );
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},
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stop: function( event, ui ) {
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$( window ).unbind( 'mousemove' ); // Stop tracking the mouse
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// Reset settings pops handle back to the step position
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this.settings.trigger( 'change' );
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}
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});
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// The diff view.
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// This is the view for the current active diff.
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revisions.view.Diff = wp.Backbone.View.extend({
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tagName: 'div',
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className: 'revisions-diff',
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template: wp.template('revisions-diff'),
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// Generate the options to be passed to the template.
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prepare: function() {
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return _.extend({ fields: this.model.fields.toJSON() }, this.options );
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}
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});
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// Initialize the revisions UI.
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revisions.init = function() {
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revisions.view.frame = new revisions.view.Frame({
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collection: new revisions.model.Revisions( revisions.settings.revisionData )
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}).render();
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};
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$( revisions.init );
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}(jQuery));
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