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/home/tahkoom/public_html/wp-admin/js/revisions.js
/**
* @file Revisions interface functions, Backbone classes and
* the revisions.php document.ready bootstrap.
*
* @output wp-admin/js/revisions.js
*/
/* global isRtl */
window.wp = window.wp || {};
(function($) {
var revisions;
/**
* Expose the module in window.wp.revisions.
*/
revisions = wp.revisions = { model: {}, view: {}, controller: {} };
// Link post revisions data served from the back end.
revisions.settings = window._wpRevisionsSettings || {};
// For debugging.
revisions.debug = false;
/**
* wp.revisions.log
*
* A debugging utility for revisions. Works only when a
* debug flag is on and the browser supports it.
*/
revisions.log = function() {
if ( window.console && revisions.debug ) {
window.console.log.apply( window.console, arguments );
}
};
// Handy functions to help with positioning.
$.fn.allOffsets = function() {
var offset = this.offset() || {top: 0, left: 0}, win = $(window);
return _.extend( offset, {
right: win.width() - offset.left - this.outerWidth(),
bottom: win.height() - offset.top - this.outerHeight()
});
};
$.fn.allPositions = function() {
var position = this.position() || {top: 0, left: 0}, parent = this.parent();
return _.extend( position, {
right: parent.outerWidth() - position.left - this.outerWidth(),
bottom: parent.outerHeight() - position.top - this.outerHeight()
});
};
/**
* ========================================================================
* 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.on( 'change:from', this.handleLocalChanges );
this.on( 'change:to', this.handleLocalChanges );
this.on( 'change:compareTwoMode', this.updateSliderSettings );
this.on( 'update:revisions', this.updateSliderSettings );
// Listen for changes to the hovered revision.
this.on( '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,
offset: {},
hovering: false, // Whether the mouse is hovering.
scrubbing: false // Whether the mouse is scrubbing.
},
initialize: function( options ) {
this.frame = options.frame;
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({});
/**
* wp.revisions.model.Revisions
*
* A collection of post revisions.
*/
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() {
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.postId = options.postId;
this.requests = {};
},
model: revisions.model.Diff,
ensure: function( id, context ) {
var diff = this.get( id ),
request = this.requests[ id ],
deferred = $.Deferred(),
ids = {},
from = id.split(':')[0],
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 ) ).fail( _.bind( function() {
deferred.reject();
}) );
}
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() {
self._loadAll( allRevisionIds, centerId, num ).done( function() {
deferred.resolve();
});
}).fail( function() {
if ( 1 === num ) { // Already tried 1. This just isn't working. Give up.
deferred.reject();
} else { // Request fewer diffs this time.
self._loadAll( allRevisionIds, centerId, Math.ceil( num / 2 ) ).done( function() {
deferred.resolve();
});
}
});
} else {
deferred.resolve();
}
return deferred;
},
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: this.postId
});
var deferred = wp.ajax.send( options ),
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 );
}
}
});
/**
* wp.revisions.model.FrameState
*
* The frame state.
*
* @see wp.revisions.view.Frame
*
* @param {object} attributes Model attributes - none are required.
* @param {object} options Options for the model.
* @param {revisions.model.Revisions} options.revisions A collection of revisions.
*/
revisions.model.FrameState = Backbone.Model.extend({
defaults: {
loading: false,
error: false,
compareTwoMode: false
},
initialize: function( attributes, options ) {
var state = this.get( 'initialDiffState' );
_.bindAll( this, 'receiveDiff' );
this._debouncedEnsureDiff = _.debounce( this._ensureDiff, 200 );
this.revisions = options.revisions;
this.diffs = new revisions.model.Diffs( [], {
revisions: this.revisions,
postId: this.get( 'postId' )
} );
// Set the initial diffs collection.
this.diffs.set( this.get( 'diffData' ) );
// Set up internal listeners.
this.listenTo( this, 'change:from', this.changeRevisionHandler );
this.listenTo( this, 'change:to', this.changeRevisionHandler );
this.listenTo( this, 'change:compareTwoMode', this.changeMode );
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 attributes.
this.set( {
to : this.revisions.get( state.to ),
from : this.revisions.get( state.from ),
compareTwoMode : state.compareTwoMode
} );
// Start the router if browser supports History API.
if ( window.history && window.history.pushState ) {
this.router = new revisions.Router({ model: this });
if ( Backbone.History.started ) {
Backbone.history.stop();
}
Backbone.history.start({ pushState: true });
}
},
updateLoadingStatus: function() {
this.set( 'error', false );
this.set( 'loading', ! this.diff() );
},
changeMode: function( model, value ) {
var toIndex = this.revisions.indexOf( this.get( 'to' ) );
// If we were on the first revision before switching to two-handled mode,
// bump the 'to' position over one.
if ( value && 0 === toIndex ) {
this.set({
from: this.revisions.at( toIndex ),
to: this.revisions.at( toIndex + 1 )
});
}
// When switching back to single-handled mode, reset 'from' model to
// one position before the 'to' model.
if ( ! value && 0 !== toIndex ) { // '! value' means switching to single-handled mode.
this.set({
from: this.revisions.at( toIndex - 1 ),
to: this.revisions.at( toIndex )
});
}
},
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.receiveDiff( 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() {
this.updateDiff();
},
receiveDiff: function( diff ) {
// Did we actually get a diff?
if ( _.isUndefined( diff ) || _.isUndefined( diff.id ) ) {
this.set({
loading: false,
error: true
});
} else if ( this._diffId === diff.id ) { // Make sure the current diff didn't change.
this.trigger( 'update:diff', diff );
}
},
_ensureDiff: function() {
return this.diffs.ensure( this._diffId, this ).always( this.receiveDiff );
}
});
/**
* ========================================================================
* VIEWS
* ========================================================================
*/
/**
* wp.revisions.view.Frame
*
* Top level frame that orchestrates the revisions experience.
*
* @param {object} options The options hash for the view.
* @param {revisions.model.FrameState} options.model The frame state model.
*/
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.listenTo( this.model, 'change:error', this.updateErrorStatus );
this.views.set( '.revisions-control-frame', new revisions.view.Controls({
model: this.model
}) );
},
render: function() {
wp.Backbone.View.prototype.render.apply( this, arguments );
$('html').css( 'overflow-y', 'scroll' );
$('#wpbody-content .wrap').append( this.el );
this.updateCompareTwoMode();
this.renderDiff( this.model.diff() );
this.views.ready();
return this;
},
renderDiff: function( diff ) {
this.views.set( '.revisions-diff-frame', new revisions.view.Diff({
model: diff
}) );
},
updateLoadingStatus: function() {
this.$el.toggleClass( 'loading', this.model.get('loading') );
},
updateErrorStatus: function() {
this.$el.toggleClass( 'diff-error', this.model.get('error') );
},
updateCompareTwoMode: function() {
this.$el.toggleClass( 'comparing-two-revisions', this.model.get('compareTwoMode') );
}
});
/**
* wp.revisions.view.Controls
*
* The controls view.
*
* 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() {
_.bindAll( this, 'setWidth' );
// Add the checkbox view.
this.views.add( new revisions.view.Checkbox({
model: this.model
}) );
// Add the button view.
this.views.add( new revisions.view.Buttons({
model: this.model
}) );
// Prep the slider model.
var slider = new revisions.model.Slider({
frame: this.model,
revisions: this.model.revisions
}),
// Prep the tooltip model.
tooltip = new revisions.model.Tooltip({
frame: this.model,
revisions: this.model.revisions,
slider: slider
});
// Add the tooltip view.
this.views.add( new revisions.view.Tooltip({
model: tooltip
}) );
// Add the tickmarks view.
this.views.add( new revisions.view.Tickmarks({
model: tooltip
}) );
// Add the visually hidden slider help view.
this.views.add( new revisions.view.SliderHelp() );
// Add the slider view.
this.views.add( new revisions.view.Slider({
model: slider
}) );
// Add the Metabox view.
this.views.add( new revisions.view.Metabox({
model: this.model
}) );
},
ready: function() {
this.top = this.$el.offset().top;
this.window = $(window);
this.window.on( 'scroll.wp.revisions', {controls: this}, function(e) {
var controls = e.data.controls,
container = controls.$el.parent(),
scrolled = controls.window.scrollTop(),
frame = controls.views.parent;
if ( scrolled >= controls.top ) {
if ( ! frame.$el.hasClass('pinned') ) {
controls.setWidth();
container.css('height', container.height() + 'px' );
controls.window.on('resize.wp.revisions.pinning click.wp.revisions.pinning', {controls: controls}, function(e) {
e.data.controls.setWidth();
});
}
frame.$el.addClass('pinned');
} else if ( frame.$el.hasClass('pinned') ) {
controls.window.off('.wp.revisions.pinning');
controls.$el.css('width', 'auto');
frame.$el.removeClass('pinned');
container.css('height', 'auto');
controls.top = controls.$el.offset().top;
} else {
controls.top = controls.$el.offset().top;
}
});
},
setWidth: function() {
this.$el.css('width', this.$el.parent().width() + 'px');
}
});
// The tickmarks view.
revisions.view.Tickmarks = wp.Backbone.View.extend({
className: 'revisions-tickmarks',
direction: isRtl ? 'right' : 'left',
initialize: function() {
this.listenTo( this.model, 'change:revision', this.reportTickPosition );
},
reportTickPosition: function( model, revision ) {
var offset, thisOffset, parentOffset, tick, index = this.model.revisions.indexOf( revision );
thisOffset = this.$el.allOffsets();
parentOffset = this.$el.parent().allOffsets();
if ( index === this.model.revisions.length - 1 ) {
// Last one.
offset = {
rightPlusWidth: thisOffset.left - parentOffset.left + 1,
leftPlusWidth: thisOffset.right - parentOffset.right + 1
};
} else {
// Normal tick.
tick = this.$('div:nth-of-type(' + (index + 1) + ')');
offset = tick.allPositions();
_.extend( offset, {
left: offset.left + thisOffset.left - parentOffset.left,
right: offset.right + thisOffset.right - parentOffset.right
});
_.extend( offset, {
leftPlusWidth: offset.left + tick.outerWidth(),
rightPlusWidth: offset.right + tick.outerWidth()
});
}
this.model.set({ offset: offset });
},
ready: function() {
var tickCount, tickWidth;
tickCount = this.model.revisions.length - 1;
tickWidth = 1 / tickCount;
this.$el.css('width', ( this.model.revisions.length * 50 ) + 'px');
_(tickCount).times( function( index ){
this.$el.append( '<div style="' + this.direction + ': ' + ( 100 * tickWidth * index ) + '%"></div>' );
}, this );
}
});
// The metabox view.
revisions.view.Metabox = wp.Backbone.View.extend({
className: 'revisions-meta',
initialize: function() {
// Add the 'from' view.
this.views.add( new revisions.view.MetaFrom({
model: this.model,
className: 'diff-meta diff-meta-from'
}) );
// Add the 'to' view.
this.views.add( new revisions.view.MetaTo({
model: this.model
}) );
}
});
// The revision meta view (to be extended).
revisions.view.Meta = wp.Backbone.View.extend({
template: wp.template('revisions-meta'),
events: {
'click .restore-revision': 'restoreRevision'
},
initialize: function() {
this.listenTo( this.model, 'update:revisions', this.render );
},
prepare: function() {
return _.extend( this.model.toJSON()[this.type] || {}, {
type: this.type
});
},
restoreRevision: function() {
document.location = this.model.get('to').attributes.restoreUrl;
}
});
// The revision meta 'from' view.
revisions.view.MetaFrom = revisions.view.Meta.extend({
className: 'diff-meta diff-meta-from',
type: 'from'
});
// The revision meta 'to' view.
revisions.view.MetaTo = revisions.view.Meta.extend({
className: 'diff-meta diff-meta-to',
type: 'to'
});
// 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() {
// Activate compare two mode?
this.model.set({ compareTwoMode: $('.compare-two-revisions').prop('checked') });
}
});
// The slider visually hidden help view.
revisions.view.SliderHelp = wp.Backbone.View.extend({
className: 'revisions-slider-hidden-help',
template: wp.template( 'revisions-slider-hidden-help' )
});
// The tooltip view.
// Encapsulates the tooltip.
revisions.view.Tooltip = wp.Backbone.View.extend({
className: 'revisions-tooltip',
template: wp.template('revisions-meta'),
initialize: function() {
this.listenTo( this.model, 'change:offset', this.render );
this.listenTo( this.model, 'change:hovering', this.toggleVisibility );
this.listenTo( this.model, 'change:scrubbing', this.toggleVisibility );
},
prepare: function() {
if ( _.isNull( this.model.get('revision') ) ) {
return;
} else {
return _.extend( { type: 'tooltip' }, {
attributes: this.model.get('revision').toJSON()
});
}
},
render: function() {
var otherDirection,
direction,
directionVal,
flipped,
css = {},
position = this.model.revisions.indexOf( this.model.get('revision') ) + 1;
flipped = ( position / this.model.revisions.length ) > 0.5;
if ( isRtl ) {
direction = flipped ? 'left' : 'right';
directionVal = flipped ? 'leftPlusWidth' : direction;
} else {
direction = flipped ? 'right' : 'left';
directionVal = flipped ? 'rightPlusWidth' : direction;
}
otherDirection = 'right' === direction ? 'left': 'right';
wp.Backbone.View.prototype.render.apply( this, arguments );
css[direction] = this.model.get('offset')[directionVal] + 'px';
css[otherDirection] = '';
this.$el.toggleClass( 'flipped', flipped ).css( css );
},
visible: function() {
return this.model.get( 'scrubbing' ) || this.model.get( 'hovering' );
},
toggleVisibility: function() {
if ( this.visible() ) {
this.$el.stop().show().fadeTo( 100 - this.el.style.opacity * 100, 1 );
} else {
this.$el.stop().fadeTo( this.el.style.opacity * 300, 0, function(){ $(this).hide(); } );
}
return;
}
});
// 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 .revisions-next .button': 'nextRevision',
'click .revisions-previous .button': 'previousRevision'
},
initialize: function() {
this.listenTo( this.model, 'update:revisions', this.disabledButtonCheck );
},
ready: function() {
this.disabledButtonCheck();
},
// Go to a specific model index.
gotoModel: function( toIndex ) {
var attributes = {
to: this.model.revisions.at( toIndex )
};
// If we're at the first revision, unset 'from'.
if ( toIndex ) {
attributes.from = this.model.revisions.at( toIndex - 1 );
} else {
this.model.unset('from', { silent: true });
}
this.model.set( attributes );
},
// Go to the 'next' revision.
nextRevision: function() {
var toIndex = this.model.revisions.indexOf( this.model.get('to') ) + 1;
this.gotoModel( toIndex );
},
// Go to the 'previous' revision.
previousRevision: function() {
var toIndex = this.model.revisions.indexOf( this.model.get('to') ) - 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 = $('.revisions-previous .button'),
val = this.model.revisions.indexOf( this.model.get('to') );
// Disable "Next" button if you're on the last node.
next.prop( 'disabled', ( maxVal === val ) );
// Disable "Previous" button if you're on the first node.
previous.prop( 'disabled', ( minVal === val ) );
}
});
// The slider view.
revisions.view.Slider = wp.Backbone.View.extend({
className: 'wp-slider',
direction: isRtl ? 'right' : 'left',
events: {
'mousemove' : 'mouseMove'
},
initialize: function() {
_.bindAll( this, 'start', 'slide', 'stop', 'mouseMove', 'mouseEnter', 'mouseLeave' );
this.listenTo( this.model, 'update:slider', this.applySliderSettings );
},
ready: function() {
this.$el.css('width', ( this.model.revisions.length * 50 ) + 'px');
this.$el.slider( _.extend( this.model.toJSON(), {
start: this.start,
slide: this.slide,
stop: this.stop
}) );
this.$el.hoverIntent({
over: this.mouseEnter,
out: this.mouseLeave,
timeout: 800
});
this.applySliderSettings();
},
accessibilityHelper: function() {
var handles = $( '.ui-slider-handle' );
handles.first().attr( {
role: 'button',
'aria-labelledby': 'diff-title-from diff-title-author',
'aria-describedby': 'revisions-slider-hidden-help',
} );
handles.last().attr( {
role: 'button',
'aria-labelledby': 'diff-title-to diff-title-author',
'aria-describedby': 'revisions-slider-hidden-help',
} );
},
mouseMove: function( e ) {
var zoneCount = this.model.revisions.length - 1, // One fewer zone than models.
sliderFrom = this.$el.allOffsets()[this.direction], // "From" edge of slider.
sliderWidth = this.$el.width(), // Width of slider.
tickWidth = sliderWidth / zoneCount, // Calculated width of zone.
actualX = ( isRtl ? $(window).width() - e.pageX : e.pageX ) - sliderFrom, // Flipped for RTL - sliderFrom.
currentModelIndex = Math.floor( ( actualX + ( tickWidth / 2 ) ) / tickWidth ); // Calculate the model index.
// Ensure sane value for currentModelIndex.
if ( currentModelIndex < 0 ) {
currentModelIndex = 0;
} else if ( currentModelIndex >= this.model.revisions.length ) {
currentModelIndex = this.model.revisions.length - 1;
}
// Update the tooltip mode.
this.model.set({ hoveredRevision: this.model.revisions.at( currentModelIndex ) });
},
mouseLeave: function() {
this.model.set({ hovering: false });
},
mouseEnter: function() {
this.model.set({ hovering: true });
},
applySliderSettings: function() {
this.$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( 'to-handle', !! isRtl )
.toggleClass( 'from-handle', ! isRtl );
handles.last()
.toggleClass( 'from-handle', !! isRtl )
.toggleClass( 'to-handle', ! isRtl );
this.accessibilityHelper();
} else {
handles.removeClass('from-handle to-handle');
this.accessibilityHelper();
}
},
start: function( event, ui ) {
this.model.set({ scrubbing: true });
// Track the mouse position to enable smooth dragging,
// overrides default jQuery UI step behavior.
$( window ).on( 'mousemove.wp.revisions', { view: this }, function( e ) {
var handles,
view = e.data.view,
leftDragBoundary = view.$el.offset().left,
sliderOffset = leftDragBoundary,
sliderRightEdge = leftDragBoundary + view.$el.width(),
rightDragBoundary = sliderRightEdge,
leftDragReset = '0',
rightDragReset = '100%',
handle = $( ui.handle );
// 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') ) {
handles = handle.parent().find('.ui-slider-handle');
if ( handle.is( handles.first() ) ) {
// We're the left handle.
rightDragBoundary = handles.last().offset().left;
rightDragReset = rightDragBoundary - sliderOffset;
} else {
// We're the right handle.
leftDragBoundary = handles.first().offset().left + handles.first().width();
leftDragReset = leftDragBoundary - sliderOffset;
}
}
// Follow mouse movements, as long as handle remains inside slider.
if ( e.pageX < leftDragBoundary ) {
handle.css( 'left', leftDragReset ); // Mouse to left of slider.
} else if ( e.pageX > rightDragBoundary ) {
handle.css( 'left', rightDragReset ); // Mouse to right of slider.
} else {
handle.css( 'left', e.pageX - sliderOffset ); // Mouse in slider.
}
} );
},
getPosition: function( position ) {
return isRtl ? this.model.revisions.length - position - 1: position;
},
// Responds to slide events.
slide: function( event, ui ) {
var attributes, movedRevision;
// Compare two revisions mode.
if ( this.model.get('compareTwoMode') ) {
// Prevent sliders from occupying same spot.
if ( ui.values[1] === ui.values[0] ) {
return false;
}
if ( isRtl ) {
ui.values.reverse();
}
attributes = {
from: this.model.revisions.at( this.getPosition( ui.values[0] ) ),
to: this.model.revisions.at( this.getPosition( ui.values[1] ) )
};
} else {
attributes = {
to: this.model.revisions.at( this.getPosition( ui.value ) )
};
// If we're at the first revision, unset 'from'.
if ( this.getPosition( ui.value ) > 0 ) {
attributes.from = this.model.revisions.at( this.getPosition( ui.value ) - 1 );
} else {
attributes.from = undefined;
}
}
movedRevision = this.model.revisions.at( this.getPosition( ui.value ) );
// If we are scrubbing, a scrub to a revision is considered a hover.
if ( this.model.get('scrubbing') ) {
attributes.hoveredRevision = movedRevision;
}
this.model.set( attributes );
},
stop: function() {
$( 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.
// Maintains the URL routes so browser URL matches state.
revisions.Router = Backbone.Router.extend({
initialize: function( options ) {
this.model = options.model;
// Maintain state and history when navigating.
this.listenTo( this.model, 'update:diff', _.debounce( this.updateUrl, 250 ) );
this.listenTo( this.model, 'change:compareTwoMode', this.updateUrl );
},
baseUrl: function( url ) {
return this.model.get('baseUrl') + url;
},
updateUrl: function() {
var from = this.model.has('from') ? this.model.get('from').id : 0,
to = this.model.get('to').id;
if ( this.model.get('compareTwoMode' ) ) {
this.navigate( this.baseUrl( '?from=' + from + '&to=' + to ), { replace: true } );
} else {
this.navigate( this.baseUrl( '?revision=' + to ), { replace: true } );
}
},
handleRoute: function( a, b ) {
var compareTwo = _.isUndefined( b );
if ( ! compareTwo ) {
b = this.model.revisions.get( a );
a = this.model.revisions.prev( b );
b = b ? b.id : 0;
a = a ? a.id : 0;
}
}
});
/**
* Initialize the revisions UI for revision.php.
*/
revisions.init = function() {
var state;
// Bail if the current page is not revision.php.
if ( ! window.adminpage || 'revision-php' !== window.adminpage ) {
return;
}
state = new revisions.model.FrameState({
initialDiffState: {
// wp_localize_script doesn't stringifies ints, so cast them.
to: parseInt( revisions.settings.to, 10 ),
from: parseInt( revisions.settings.from, 10 ),
// wp_localize_script does not allow for top-level booleans so do a comparator here.
compareTwoMode: ( revisions.settings.compareTwoMode === '1' )
},
diffData: revisions.settings.diffData,
baseUrl: revisions.settings.baseUrl,
postId: parseInt( revisions.settings.postId, 10 )
}, {
revisions: new revisions.model.Revisions( revisions.settings.revisionData )
});
revisions.view.frame = new revisions.view.Frame({
model: state
}).render();
};
$( revisions.init );
}(jQuery));
التكنولوجيا تغزو الأعصاب..زراعة الشرائح الدماغية و مخاطرها – tahkoom.com
كتبت إيريني أنطون
لم يعد الذكاء الاصطناعي مجرد أداة تساعد الأطباء في التشخيص والعلاج، بل بات يمتد إلى أدمغتنا نفسها، فاتحًا الباب أمام إمكانيات غير مسبوقة، وأيضًا مخاوف وتساؤلات لا حصر لها. يعمل العلماء على تطوير شرائح تزرع داخل الدماغ، قادرة على إعادة الحركة لمرضى الشلل، وتحسين حالات الاكتئاب والقلق، بل وحتى استعادة الذاكرة لمن يعانون من أمراض مثل الزهايمر. فهل نحن على أعتاب ثورة طبية تعيد تشكيل قدراتنا العقلية؟ أم أن هذه التكنولوجيا قد تحمل مخاطر أكبر مما نتخيل؟
تكنولوجيا الشرائح الدماغية لا تزال في مراحلها الأولى عالميًا، وفي مصر بدأ الأطباء في متابعة أحدث التطورات العالمية في زراعة الشرائح الدماغية على أمل توفيرها لمرضى فقدان الحركة أو الاضطرابات النفسية.
“الشرائح الدماغية: أمل للمرضى”
قالت دكتورة ماريا ألفي، أخصائية أمراض مخ وأعصاب بالقصر العيني: “هذه الشرائح تُستخدم في علاج أمراض مثل الشلل، والشلل الرعاش، وبعض أمراض الذاكرة، والأمراض النفسية، والتشنجات، ويتم تطويرها لاستعادة الوظائف الحسية والحركية. ولكن حتى الآن، لن تصل هذه التكنولوجيا إلى مصر لأنها مازالت تحت التجارب والدراسات في الخارج”.
وأوضحت دكتورة ماريا ألفي أن هذه الشرائح تعمل على تسجيل الإشارات العصبية من الدماغ وتحويلها إلى أوامر للأجهزة المستخدمة مثل الأطراف الصناعية، فيتحكم بها المريض من خلال أفكاره. وأضافت أن هناك تجارب حاليًا لتحويل الإشارات العصبية المرتبطة بالكلام إلى نصوص أو أصوات، مما يعطي أملًا كبيرًا لمرضى فقدان النطق.
التحديات والمخاطر
قال الدكتور بولا جرجس، جراح مخ وأعصاب ونائب رئيس جراحة المخ والأعصاب بالقصر العيني سابقًا: “هناك تحديات تقنية وطبية تجعل هذه التكنولوجيا غير بديلة للعلاجات التقليدية في الوقت الحالي، لكنها يمكن أن تقلل من الحاجة للأدوية في بعض الحالات”.
وأوضح د. بولا جرجس أن لهذه الشرائح مضاعفات ومخاطر، من بينها تليف الأنسجة المحيطة بالشريحة، والنزيف الدماغي أثناء الجراحة أو بعدها، والعدوى التي قد تؤدي إلى إزالة الشريحة مع احتمالية حدوث اضطراب في كهرباء المخ. بالإضافة إلى أن هذه الشرائح قد تؤثر على المزاج والسلوك وتحدث تغيرات في التفكير والعاطفة.
مستقبل الشرائح الدماغية في مصر
أضاف د. بولا جرجس أن هناك مستشفيات متقدمة جدًا في مصر مثل القصر العيني، ومستشفى عين شمس التخصصي، ومعهد ناصر، قادرة على إجراء هذه العمليات بمجرد الانتهاء من مراحل البحث العالمية ووصول هذه التقنيات والأبحاث إلى مصر. وأوضح أن عمليات التحفيز العميق تُجرى في مصر لمرضى اضطرابات الحركة ومرضى باركنسون، لكن الشرائح لم تُستخدم حتى الآن.
واختتمت د. ماريا حديثها بقولها: “من المتوقع في المستقبل أن تصبح هذه الشرائح أكثر كفاءة، ويتم التحكم فيها لاسلكيًا، مما سيسمح للمرضى باستخدامها بسهولة أكبر. ودمجها بالذكاء الاصطناعي سيساعد في تفاعلها مع الإشارات العصبية، مما يجعلها أكثر دقة وفعالية”.
لا شك أن الشرائح الدماغية تمثل قفزة هائلة في عالم الطب العصبي، وقد تحمل مستقبلاً مشرقًا لملايين المرضى حول العالم. ومع ذلك، فإن التحديات التقنية والطبية لا تزال قائمة، مما يجعل هذه التكنولوجيا بحاجة إلى مزيد من الأبحاث قبل أن تصبح متاحة على نطاق واسع.
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