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* VisualEditor UserInterface PreviewElement class.
*
* @copyright See AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* Creates a ve.ui.PreviewElement object.
*
* @class
* @extends OO.ui.Element
* @mixins OO.EventEmitter
*
* @constructor
* @param {ve.dm.Node} [model] Model from which to create a preview
* @param {Object} [config] Configuration options
* @cfg {boolean} [useView=false] Use the view HTML, and don't bother generating model HTML, which
* is a bit slower
*/
ve.ui.PreviewElement = function VeUiPreviewElement( model, config ) {
config = config || {};
// Parent constructor
ve.ui.PreviewElement.super.call( this, config );
// Mixin constructor
OO.EventEmitter.call( this );
this.useView = !!config.useView;
if ( model ) {
this.setModel( model );
}
// Initialize
this.$element.addClass( 've-ui-previewElement' );
};
/**
* The element rendering has been updated
*
* @event render
*/
/* Inheritance */
OO.inheritClass( ve.ui.PreviewElement, OO.ui.Element );
OO.mixinClass( ve.ui.PreviewElement, OO.EventEmitter );
/**
* Destroy the preview node.
*/
ve.ui.PreviewElement.prototype.destroy = function () {
if ( this.view ) {
this.view.destroy();
this.view = null;
}
};
/**
* Set the model node for the preview
*
* @param {ve.dm.Node} model Model from which to create a preview
*/
ve.ui.PreviewElement.prototype.setModel = function ( model ) {
this.model = model;
this.updatePreview();
};
/**
* Modify DOM node before appending to the preview
*
* @param {HTMLElement} element Element to be appended
*/
ve.ui.PreviewElement.prototype.beforeAppend = function ( element ) {
// Remove slugs and nails. This used to be done in CSS but triggered
// a catastrophic browser bug in Chrome (T341901)
Array.prototype.forEach.call( element.querySelectorAll( '.ve-ce-nail, .ve-ce-branchNode-slug' ), function ( el ) {
el.parentNode.removeChild( el );
} );
ve.targetLinksToNewWindow( element );
};
/**
* Replace the content of the body with the model DOM
*
* Doesn't use jQuery to avoid document switching performance bug
*/
ve.ui.PreviewElement.prototype.replaceWithModelDom = function () {
var htmlDocument = ve.dm.converter.getDomFromNode( this.model, ve.dm.Converter.static.PREVIEW_MODE ),
body = htmlDocument.body,
element = this.$element[ 0 ];
// Resolve attributes (in particular, expand 'href' and 'src' using the right base)
ve.resolveAttributes(
body,
this.model.getDocument().getHtmlDocument(),
ve.dm.Converter.static.computedAttributes
);
this.beforeAppend( body );
// Move content to element
element.innerHTML = '';
while ( body.childNodes.length ) {
element.appendChild(
element.ownerDocument.adoptNode( body.childNodes[ 0 ] )
);
}
this.afterRender();
};
/**
* Update the preview
*/
ve.ui.PreviewElement.prototype.updatePreview = function () {
var element = this;
// Initial CE node
this.view = ve.ce.nodeFactory.createFromModel( this.model );
this.beforeAppend( this.view.$element[ 0 ] );
this.$element.append( this.view.$element );
this.view.setLive( true );
ve.ce.GeneratedContentNode.static.awaitGeneratedContent( this.view )
.then( function () {
// When all children are rerendered, replace with DM DOM for a better preview.
// Conversion should be pretty fast, but avoid this (by setting useView to true)
// if you generating a lot of previews, e.g. in a list
if ( !element.useView ) {
// Verify that the PreviewElement hasn't been destroyed.
Eif ( element.view ) {
element.replaceWithModelDom();
}
} else {
element.afterRender();
}
} );
};
/**
* Cleanup and emit events after render
*
* @fires render
*/
ve.ui.PreviewElement.prototype.afterRender = function () {
// Cleanup
this.view.destroy();
this.view = null;
// Event
this.emit( 'render' );
};
/**
* Check if the preview is still generating
*
* @return {boolean} Still generating
*/
ve.ui.PreviewElement.prototype.isGenerating = function () {
return !!this.view;
};
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