WordPress/wp-admin/js/revisions.js
Mark Jaquith e8b9088c5f Revisions: Cleanup, bug fixes, refactoring, polish.
* Hide the tooltip initially.
* Fix a bug with routing.
* Further separate the Slider model and view, refactoring its code.
* More reliance on events than direct calls between areas.
* Smarter background diff loading (single mode). Loads the diffs closest to your position first.
* Removed a bunch of manual templating and `render()` methods. Now relies more on the WP Backbone Views functionality.
* include the requested `id` in `ensure:load`.
* new trigger: `ensure`, for `ensure()` attempts, regardless of whether they are already loaded.
* pass along a promise in both `ensure` and `ensure:load`.
* in `ensure`, remove requests for diffs we aready have

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24671 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2013-07-12 14:01:39 +00:00

959 lines
28 KiB
JavaScript

window.wp = window.wp || {};
(function($) {
var revisions;
revisions = wp.revisions = { model: {}, view: {}, controller: {} };
// Link settings.
revisions.settings = _.isUndefined( _wpRevisionsSettings ) ? {} : _wpRevisionsSettings;
// For debugging
revisions.debug = true;
revisions.log = function() {
if ( revisions.debug )
console.log.apply( console, arguments );
};
// wp_localize_script transforms top-level numbers into strings. Undo that.
if ( revisions.settings.to )
revisions.settings.to = parseInt( revisions.settings.to, 10 );
if ( revisions.settings.from )
revisions.settings.from = parseInt( revisions.settings.from, 10 );
// wp_localize_script does not allow for top-level booleans. Fix that.
if ( revisions.settings.compareTwoMode )
revisions.settings.compareTwoMode = revisions.settings.compareTwoMode === '1';
/**
* ========================================================================
* MODELS
* ========================================================================
*/
revisions.model.Slider = Backbone.Model.extend({
defaults: {
value: null,
values: null,
min: 0,
max: 1,
step: 1,
range: false,
compareTwoMode: false
},
initialize: function( options ) {
this.frame = options.frame;
this.revisions = options.revisions;
// Listen for changes to the revisions or mode from outside
this.listenTo( this.frame, 'update:revisions', this.receiveRevisions );
this.listenTo( this.frame, 'change:compareTwoMode', this.updateMode );
// Listen for internal changes
this.listenTo( this, 'change:from', this.handleLocalChanges );
this.listenTo( this, 'change:to', this.handleLocalChanges );
this.listenTo( this, 'change:compareTwoMode', this.updateSliderSettings );
this.listenTo( this, 'update:revisions', this.updateSliderSettings );
// Listen for changes to the hovered revision
this.listenTo( this, 'change:hoveredRevision', this.hoverRevision );
this.set({
max: this.revisions.length - 1,
compareTwoMode: this.frame.get('compareTwoMode'),
from: this.frame.get('from'),
to: this.frame.get('to')
});
this.updateSliderSettings();
},
getSliderValue: function( a, b ) {
return isRtl ? this.revisions.length - this.revisions.indexOf( this.get(a) ) - 1 : this.revisions.indexOf( this.get(b) );
},
updateSliderSettings: function() {
if ( this.get('compareTwoMode') ) {
this.set({
values: [
this.getSliderValue( 'to', 'from' ),
this.getSliderValue( 'from', 'to' )
],
value: null,
range: true // ensures handles cannot cross
});
} else {
this.set({
value: this.getSliderValue( 'to', 'to' ),
values: null,
range: false
});
}
this.trigger( 'update:slider' );
},
// Called when a revision is hovered
hoverRevision: function( model, value ) {
this.trigger( 'hovered:revision', value );
},
// Called when `compareTwoMode` changes
updateMode: function( model, value ) {
this.set({ compareTwoMode: value });
},
// Called when `from` or `to` changes in the local model
handleLocalChanges: function() {
this.frame.set({
from: this.get('from'),
to: this.get('to')
});
},
// Receives revisions changes from outside the model
receiveRevisions: function( from, to ) {
// Bail if nothing changed
if ( this.get('from') === from && this.get('to') === to )
return;
this.set({ from: from, to: to }, { silent: true });
this.trigger( 'update:revisions', from, to );
}
});
revisions.model.Tooltip = Backbone.Model.extend({
defaults: {
revision: null,
hovering: false, // Whether the mouse is hovering
scrubbing: false // Whether the mouse is scrubbing
},
initialize: function( options ) {
this.revisions = options.revisions;
this.slider = options.slider;
this.listenTo( this.slider, 'hovered:revision', this.updateRevision );
this.listenTo( this.slider, 'change:hovering', this.setHovering );
this.listenTo( this.slider, 'change:scrubbing', this.setScrubbing );
},
updateRevision: function( revision ) {
this.set({ revision: revision });
},
setHovering: function( model, value ) {
this.set({ hovering: value });
},
setScrubbing: function( model, value ) {
this.set({ scrubbing: value });
}
});
revisions.model.Revision = Backbone.Model.extend({});
revisions.model.Revisions = Backbone.Collection.extend({
model: revisions.model.Revision,
initialize: function() {
_.bindAll( this, 'next', 'prev' );
},
next: function( revision ) {
var index = this.indexOf( revision );
if ( index !== -1 && index !== this.length - 1 )
return this.at( index + 1 );
},
prev: function( revision ) {
var index = this.indexOf( revision );
if ( index !== -1 && index !== 0 )
return this.at( index - 1 );
}
});
revisions.model.Field = Backbone.Model.extend({});
revisions.model.Fields = Backbone.Collection.extend({
model: revisions.model.Field
});
revisions.model.Diff = Backbone.Model.extend({
initialize: function( attributes, options ) {
var fields = this.get('fields');
this.unset('fields');
this.fields = new revisions.model.Fields( fields );
}
});
revisions.model.Diffs = Backbone.Collection.extend({
initialize: function( models, options ) {
_.bindAll( this, 'getClosestUnloaded' );
this.loadAll = _.once( this._loadAll );
this.revisions = options.revisions;
this.requests = {};
},
model: revisions.model.Diff,
ensure: function( id, context ) {
var diff = this.get( id );
var request = this.requests[ id ];
var deferred = $.Deferred();
var ids = {};
var from = id.split(':')[0];
var to = id.split(':')[1];
ids[id] = true;
wp.revisions.log( 'ensure', id );
this.trigger( 'ensure', ids, from, to, deferred.promise() );
if ( diff ) {
deferred.resolveWith( context, [ diff ] );
} else {
this.trigger( 'ensure:load', ids, from, to, deferred.promise() );
_.each( ids, _.bind( function( id ) {
// Remove anything that has an ongoing request
if ( this.requests[ id ] )
delete ids[ id ];
// Remove anything we already have
if ( this.get( id ) )
delete ids[ id ];
}, this ) );
if ( ! request ) {
// Always include the ID that started this ensure
ids[ id ] = true;
request = this.load( _.keys( ids ) );
}
request.done( _.bind( function() {
deferred.resolveWith( context, [ this.get( id ) ] );
}, this ) );
}
return deferred.promise();
},
// Returns an array of proximal diffs
getClosestUnloaded: function( ids, centerId ) {
var self = this;
return _.chain([0].concat( ids )).initial().zip( ids ).sortBy( function( pair ) {
return Math.abs( centerId - pair[1] );
}).map( function( pair ) {
return pair.join(':');
}).filter( function( diffId ) {
return _.isUndefined( self.get( diffId ) ) && ! self.requests[ diffId ];
}).value();
},
_loadAll: function( allRevisionIds, centerId, num ) {
var self = this, deferred = $.Deferred();
diffs = _.first( this.getClosestUnloaded( allRevisionIds, centerId ), num );
if ( _.size( diffs ) > 0 ) {
this.load( diffs ).done( function() {
deferred.resolve();
self._loadAll( allRevisionIds, centerId, num );
});
return deferred.promise();
} else {
return deferred.reject().promise();
}
},
load: function( comparisons ) {
wp.revisions.log( 'load', comparisons );
// Our collection should only ever grow, never shrink, so remove: false
return this.fetch({ data: { compare: comparisons }, remove: false }).done( function(){
wp.revisions.log( 'load:complete', comparisons );
});
},
sync: function( method, model, options ) {
if ( 'read' === method ) {
options = options || {};
options.context = this;
options.data = _.extend( options.data || {}, {
action: 'get-revision-diffs',
post_id: revisions.settings.postId
});
var deferred = wp.ajax.send( options );
var requests = this.requests;
// Record that we're requesting each diff.
if ( options.data.compare ) {
_.each( options.data.compare, function( id ) {
requests[ id ] = deferred;
});
}
// When the request completes, clear the stored request.
deferred.always( function() {
if ( options.data.compare ) {
_.each( options.data.compare, function( id ) {
delete requests[ id ];
});
}
});
return deferred;
// Otherwise, fall back to `Backbone.sync()`.
} else {
return Backbone.Model.prototype.sync.apply( this, arguments );
}
}
});
revisions.model.FrameState = Backbone.Model.extend({
defaults: {
loading: false,
compareTwoMode: false
},
initialize: function( attributes, options ) {
var properties = {};
this._debouncedEnsureDiff = _.debounce( this._ensureDiff, 200 );
this.revisions = options.revisions;
this.diffs = new revisions.model.Diffs( [], { revisions: this.revisions });
// Set the initial diffs collection provided through the settings
this.diffs.set( revisions.settings.diffData );
// Set up internal listeners
this.listenTo( this, 'change:from', this.changeRevisionHandler );
this.listenTo( this, 'change:to', this.changeRevisionHandler );
this.listenTo( this, 'update:revisions', this.updatedRevisions );
this.listenTo( this.diffs, 'ensure:load', this.updateLoadingStatus );
this.listenTo( this, 'update:diff', this.updateLoadingStatus );
// Set the initial revisions, baseUrl, and mode as provided through settings
properties.to = this.revisions.get( revisions.settings.to );
properties.from = this.revisions.get( revisions.settings.from );
properties.compareTwoMode = revisions.settings.compareTwoMode;
properties.baseUrl = revisions.settings.baseUrl;
this.set( properties );
// Start the router
this.router = new revisions.Router({ model: this });
Backbone.history.start({ pushState: true });
},
updateLoadingStatus: function() {
this.set( 'loading', ! this.diff() );
},
updatedRevisions: function( from, to ) {
if ( this.get( 'compareTwoMode' ) ) {
// TODO: compare-two loading strategy
} else {
this.diffs.loadAll( this.revisions.pluck('id'), to.id, 40 );
}
},
// Fetch the currently loaded diff.
diff: function() {
return this.diffs.get( this._diffId );
},
// So long as `from` and `to` are changed at the same time, the diff
// will only be updated once. This is because Backbone updates all of
// the changed attributes in `set`, and then fires the `change` events.
updateDiff: function( options ) {
var from, to, diffId, diff;
options = options || {};
from = this.get('from');
to = this.get('to');
diffId = ( from ? from.id : 0 ) + ':' + to.id;
// Check if we're actually changing the diff id.
if ( this._diffId === diffId )
return $.Deferred().reject().promise();
this._diffId = diffId;
this.trigger( 'update:revisions', from, to );
diff = this.diffs.get( diffId );
// If we already have the diff, then immediately trigger the update.
if ( diff ) {
this.trigger( 'update:diff', diff );
return $.Deferred().resolve().promise();
// Otherwise, fetch the diff.
} else {
if ( options.immediate ) {
return this._ensureDiff();
} else {
this._debouncedEnsureDiff();
return $.Deferred().reject().promise();
}
}
},
// A simple wrapper around `updateDiff` to prevent the change event's
// parameters from being passed through.
changeRevisionHandler: function( model, value, options ) {
this.updateDiff();
},
_ensureDiff: function() {
return this.diffs.ensure( this._diffId, this ).done( function( diff ) {
// Make sure the current diff didn't change while the request was in flight.
if ( this._diffId === diff.id )
this.trigger( 'update:diff', diff );
});
}
});
/**
* ========================================================================
* VIEWS
* ========================================================================
*/
// The frame view. This contains the entire page.
revisions.view.Frame = wp.Backbone.View.extend({
className: 'revisions',
template: wp.template('revisions-frame'),
initialize: function() {
this.listenTo( this.model, 'update:diff', this.renderDiff );
this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode );
this.listenTo( this.model, 'change:loading', this.updateLoadingStatus );
this.views.set( '.revisions-control-frame', new revisions.view.Controls({
model: this.model
}) );
},
render: function() {
wp.Backbone.View.prototype.render.apply( this, arguments );
$('#wpbody-content .wrap').append( this.el );
this.updateCompareTwoMode();
this.renderDiff( this.model.diff() );
this.views.ready();
return this;
},
renderDiff: function( diff ) {
this.views.set( '.revisions-diff-frame', new revisions.view.Diff({
model: diff
}) );
},
updateLoadingStatus: function() {
this.$el.toggleClass( 'loading', this.model.get('loading') );
},
updateCompareTwoMode: function() {
this.$el.toggleClass( 'comparing-two-revisions', this.model.get('compareTwoMode') );
}
});
// The control view.
// This contains the revision slider, previous/next buttons, the meta info and the compare checkbox.
revisions.view.Controls = wp.Backbone.View.extend({
className: 'revisions-controls',
initialize: function() {
// Add the button view
this.views.add( new revisions.view.Buttons({
model: this.model
}) );
// Add the checkbox view
this.views.add( new revisions.view.Checkbox({
model: this.model
}) );
// Prep the slider model
var slider = new revisions.model.Slider({
frame: this.model,
revisions: this.model.revisions
});
// Add the tooltip view
this.views.add( new revisions.view.Tooltip({
model: new revisions.model.Tooltip({
revisions: this.model.revisions,
slider: slider
})
}) );
// Add the tickmarks view
this.views.add( new revisions.view.Tickmarks({
model: this.model
}) );
// Add the slider view
this.views.add( new revisions.view.Slider({
model: slider
}) );
// Add the Meta view
this.views.add( new revisions.view.Meta({
model: this.model
}) );
}
});
// The tickmarks view
revisions.view.Tickmarks = wp.Backbone.View.extend({
className: 'revisions-tickmarks',
ready: function() {
var tickCount, tickWidth;
tickCount = this.model.revisions.length - 1;
tickWidth = 1 / tickCount;
_(tickCount).times( function(){ this.$el.append( '<div></div>' ); }, this );
this.$('div').css( 'width', ( 100 * tickWidth ) + '%' );
}
});
// The meta view
revisions.view.Meta = wp.Backbone.View.extend({
className: 'revisions-meta',
template: wp.template('revisions-meta'),
events: {
'click .restore-revision': 'restoreRevision'
},
initialize: function() {
this.listenTo( this.model, 'update:revisions', this.ready );
},
prepare: function() {
return this.model.toJSON();
},
ready: function() {
this.$('.restore-revision').prop( 'disabled', this.model.get('to').get('current') );
},
restoreRevision: function() {
var restoreUrl = this.model.get('to').attributes.restoreUrl.replace(/&amp;/g, '&');
document.location = restoreUrl;
}
});
// The checkbox view.
revisions.view.Checkbox = wp.Backbone.View.extend({
className: 'revisions-checkbox',
template: wp.template('revisions-checkbox'),
events: {
'click .compare-two-revisions': 'compareTwoToggle'
},
initialize: function() {
this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode );
},
ready: function() {
if ( this.model.revisions.length < 3 )
$('.revision-toggle-compare-mode').hide();
},
updateCompareTwoMode: function() {
this.$('.compare-two-revisions').prop( 'checked', this.model.get('compareTwoMode') );
},
// Toggle the compare two mode feature when the compare two checkbox is checked.
compareTwoToggle: function( event ) {
// Activate compare two mode?
this.model.set({ compareTwoMode: $('.compare-two-revisions').prop('checked') });
}
});
// The tooltip view.
// Encapsulates the tooltip.
revisions.view.Tooltip = wp.Backbone.View.extend({
className: 'revisions-tooltip',
template: wp.template('revisions-tooltip'),
initialize: function( options ) {
this.listenTo( this.model, 'change:revision', this.render );
this.listenTo( this.model, 'change:hovering', this.toggleVisibility );
this.listenTo( this.model, 'change:scrubbing', this.toggleVisibility );
},
visible: function() {
return this.model.get( 'scrubbing' ) || this.model.get( 'hovering' );
},
toggleVisibility: function( options ) {
options = options || {};
var visible = this.visible();
if ( visible ) { // Immediate show
this.$el.fadeIn( 200 );
} else if ( options.immediate ) { // Immediate fade out
this.$el.fadeOut( 200 );
} else { // Wait a bit, make sure we're really done, then fade it out
_.delay( function( view ) {
if ( ! view.visible() )
view.toggleVisibility({ immediate: true });
}, 500, this );
}
},
render: function() {
var offset;
// Check if a revision exists.
if ( _.isNull( this.model.get('revision') ) )
return;
this.$el.html( this.template( this.model.get('revision').toJSON() ) );
// Set the position.
offset = this.model.revisions.indexOf( this.model.get('revision') ) / ( this.model.revisions.length - 1 );
// 15% to get us to the start of the slider
// 0.7 to convert the slider-relative percentage to a page-relative percentage
// 100 to convert to a percentage
offset = 15 + (0.7 * offset * 100 ); // Now in a percentage
this.$el.css( 'left', offset + '%' );
}
});
// The buttons view.
// Encapsulates all of the configuration for the previous/next buttons.
revisions.view.Buttons = wp.Backbone.View.extend({
className: 'revisions-buttons',
template: wp.template('revisions-buttons'),
events: {
'click #next': 'nextRevision',
'click #previous': 'previousRevision'
},
initialize: function() {
this.listenTo( this.model, 'update:revisions', this.disabledButtonCheck );
},
ready: function() {
this.disabledButtonCheck();
},
// Go to a specific modelindex, taking into account RTL mode.
gotoModel: function( toIndex ) {
var attributes = {
to: this.model.revisions.at( isRtl ? this.model.revisions.length - toIndex - 1 : toIndex ) // Reverse directions for RTL.
};
// If we're at the first revision, unset 'from'.
if ( isRtl ? this.model.revisions.length - toIndex - 1 : toIndex ) // Reverse directions for RTL
attributes.from = this.model.revisions.at( isRtl ? this.model.revisions.length - toIndex - 2 : toIndex - 1 );
else
this.model.unset('from', { silent: true });
this.model.set( attributes );
},
// Go to the 'next' revision, direction takes into account RTL mode.
nextRevision: function() {
var toIndex = isRtl ? this.model.revisions.length - this.model.revisions.indexOf( this.model.get('to') ) - 1 : this.model.revisions.indexOf( this.model.get('to') );
toIndex = isRtl ? toIndex - 1 : toIndex + 1;
this.gotoModel( toIndex );
},
// Go to the 'previous' revision, direction takes into account RTL mode.
previousRevision: function() {
var toIndex = isRtl ? this.model.revisions.length - this.model.revisions.indexOf( this.model.get('to') ) - 1 : this.model.revisions.indexOf( this.model.get('to') );
toIndex = isRtl ? toIndex + 1 : toIndex - 1;
this.gotoModel( toIndex );
},
// Check to see if the Previous or Next buttons need to be disabled or enabled.
disabledButtonCheck: function() {
var maxVal = this.model.revisions.length - 1,
minVal = 0,
next = $('.revisions-next .button'),
previous = $('.revisions-previous .button'),
val = this.model.revisions.indexOf( this.model.get('to') );
// Disable "Next" button if you're on the last node.
next.prop( 'disabled', ( maxVal === val ) );
// Disable "Previous" button if you're on the first node.
previous.prop( 'disabled', ( minVal === val ) );
}
});
// The slider view.
revisions.view.Slider = wp.Backbone.View.extend({
className: 'wp-slider',
events: {
'mousemove' : 'mouseMove',
'mouseleave' : 'mouseLeave',
'mouseenter' : 'mouseEnter'
},
initialize: function() {
_.bindAll( this, 'start', 'slide', 'stop', 'mouseMove' );
this.listenTo( this.model, 'update:slider', this.applySliderSettings );
},
ready: function() {
this.$el.slider( _.extend( this.model.toJSON(), {
start: this.start,
slide: this.slide,
stop: this.stop
}) );
this.applySliderSettings();
},
mouseMove: function( e ) {
var zoneCount = this.model.revisions.length - 1, // One fewer zone than models
sliderLeft = this.$el.offset().left, // Left edge of slider
sliderWidth = this.$el.width(), // Width of slider
tickWidth = sliderWidth / zoneCount, // Calculated width of zone
actualX = e.clientX - sliderLeft, // Offset of mouse position in slider
currentModelIndex = Math.floor( ( actualX + ( tickWidth / 2 ) ) / tickWidth ); // Calculate the model index
// Reverse direction in RTL mode.
if ( isRtl )
currentModelIndex = this.model.revisions.length - currentModelIndex - 1;
// Ensure sane value for currentModelIndex.
if ( currentModelIndex < 0 )
currentModelIndex = 0;
else if ( currentModelIndex >= this.model.revisions.length )
currentModelIndex = this.model.revisions.length - 1;
// Update the tooltip model
this.model.set({
'hoveredRevision': this.model.revisions.at( currentModelIndex )
});
},
mouseLeave: function() {
this.model.set({ hovering: false });
},
mouseEnter: function() {
this.model.set({ hovering: true });
},
applySliderSettings: function() {
this.$el.slider( _.pick( this.model.toJSON(), 'value', 'values', 'range' ) );
var handles = this.$('a.ui-slider-handle');
if ( this.model.get('compareTwoMode') ) {
// in RTL mode the 'left handle' is the second in the slider, 'right' is first
handles.first()
.toggleClass( 'right-handle', !! isRtl )
.toggleClass( 'left-handle', ! isRtl );
handles.last()
.toggleClass( 'left-handle', !! isRtl )
.toggleClass( 'right-handle', ! isRtl );
} else {
handles.removeClass('left-handle right-handle');
}
},
getSliderPosition: function( ui ){
return isRtl ? this.model.revisions.length - ui.value - 1 : ui.value;
},
start: function( event, ui ) {
this.model.set({ scrubbing: true });
// Track the mouse position to enable smooth dragging,
// overrides default jQuery UI step behavior.
$( window ).on( 'mousemove.wp.revisions', { view: this }, function( e ) {
var view = e.data.view,
leftDragBoundary = view.$el.offset().left, // Initial left boundary
sliderOffset = leftDragBoundary,
sliderRightEdge = leftDragBoundary + view.$el.width(),
rightDragBoundary = sliderRightEdge, // Initial right boundary
leftDragReset = 0, // Initial left drag reset
rightDragReset = sliderRightEdge - sliderOffset; // Initial right drag reset
// In two handle mode, ensure handles can't be dragged past each other.
// Adjust left/right boundaries and reset points.
if ( view.model.get('compareTwoMode') ) {
var rightHandle = $( ui.handle ).parent().find('.right-handle'),
leftHandle = $( ui.handle ).parent().find('.left-handle');
if ( $( ui.handle ).hasClass('left-handle') ) {
// Dragging the left handle, boundary is right handle.
// RTL mode calculations reverse directions.
if ( isRtl ) {
leftDragBoundary = rightHandle.offset().left + rightHandle.width();
leftDragReset = leftDragBoundary - sliderOffset;
} else {
rightDragBoundary = rightHandle.offset().left;
rightDragReset = rightDragBoundary - sliderOffset;
}
} else {
// Dragging the right handle, boundary is the left handle.
// RTL mode calculations reverse directions.
if ( isRtl ) {
rightDragBoundary = leftHandle.offset().left;
rightDragReset = rightDragBoundary - sliderOffset;
} else {
leftDragBoundary = leftHandle.offset().left + leftHandle.width() ;
leftDragReset = leftDragBoundary - sliderOffset;
}
}
}
// Follow mouse movements, as long as handle remains inside slider.
if ( e.clientX < leftDragBoundary ) {
$( ui.handle ).css( 'left', leftDragReset ); // Mouse to left of slider.
} else if ( e.clientX > rightDragBoundary ) {
$( ui.handle ).css( 'left', rightDragReset ); // Mouse to right of slider.
} else {
$( ui.handle ).css( 'left', e.clientX - sliderOffset ); // Mouse in slider.
}
} );
},
// Responds to slide events
slide: function( event, ui ) {
var attributes;
// Compare two revisions mode
if ( ! _.isUndefined( ui.values ) && this.model.get('compareTwoMode') ) {
// Prevent sliders from occupying same spot
if ( ui.values[1] === ui.values[0] )
return false;
attributes = {
to: this.model.revisions.at( isRtl ? this.model.revisions.length - ui.values[0] - 1 : ui.values[1] ), // Reverse directions for RTL.
from: this.model.revisions.at( isRtl ? this.model.revisions.length - ui.values[1] - 1 : ui.values[0] ) // Reverse directions for RTL.
};
} else {
// Compare single revision mode
var sliderPosition = this.getSliderPosition( ui );
attributes = {
to: this.model.revisions.at( sliderPosition )
};
// If we're at the first revision, unset 'from'.
if ( sliderPosition ) // Reverse directions for RTL.
attributes.from = this.model.revisions.at( sliderPosition - 1 );
else
attributes.from = undefined;
}
this.model.set( attributes );
// If we are scrubbing, a scrub to a revision is considered a hover
if ( this.model.get( 'scrubbing' ) ) {
this.model.set({
'hoveredRevision': attributes.to
});
}
},
stop: function( event, ui ) {
$( window ).off('mousemove.wp.revisions');
this.model.updateSliderSettings(); // To snap us back to a tick mark
this.model.set({ scrubbing: false });
}
});
// The diff view.
// This is the view for the current active diff.
revisions.view.Diff = wp.Backbone.View.extend({
className: 'revisions-diff',
template: wp.template('revisions-diff'),
// Generate the options to be passed to the template.
prepare: function() {
return _.extend({ fields: this.model.fields.toJSON() }, this.options );
}
});
// The revisions router
// takes URLs with #hash fragments and routes them
revisions.Router = Backbone.Router.extend({
initialize: function( options ) {
this.model = options.model;
this.routes = this.getRoutes();
// Maintain state history when dragging/clicking
this.listenTo( this.model, 'update:diff', _.debounce( this.updateUrl, 250 ) );
this.listenTo( this.model, 'change:compareTwoMode', this.updateUrl );
},
getRoutes: function() {
var routes = {};
routes[this.baseUrl( '?from=:from&to=:to' )] = 'handleRoute';
routes[this.baseUrl( '?revision=:to' )] = 'handleRoute';
return routes;
},
baseUrl: function( url ) {
return this.model.get('baseUrl') + url;
},
updateUrl: function() {
var from = this.model.has('from') ? this.model.get('from').id : 0;
var to = this.model.get('to').id;
if ( this.model.get('compareTwoMode' ) )
this.navigate( this.baseUrl( '?from=' + from + '&to=' + to ) );
else
this.navigate( this.baseUrl( '?revision=' + to ) );
},
handleRoute: function( a, b ) {
var from, to, compareTwo;
// If `b` is undefined, this is an 'at/:to' route, for a single revision
if ( _.isUndefined( b ) ) {
b = this.model.revisions.get( a );
a = this.model.revisions.prev( b );
b = b ? b.id : 0;
a = a ? a.id : 0;
compareTwo = false;
} else {
compareTwo = true;
}
from = parseInt( a, 10 );
to = parseInt( b, 10 );
this.model.set({ compareTwoMode: compareTwo });
if ( ! _.isUndefined( this.model ) ) {
var selectedToRevision = this.model.revisions.get( to ),
selectedFromRevision = this.model.revisions.get( from );
this.model.set({
to: selectedToRevision,
from: selectedFromRevision
});
}
revisions.settings.to = to;
}
});
// Initialize the revisions UI.
revisions.init = function() {
revisions.view.frame = new revisions.view.Frame({
model: new revisions.model.FrameState({}, {
revisions: new revisions.model.Revisions( revisions.settings.revisionData )
})
}).render();
};
$( revisions.init );
}(jQuery));