739 lines
22 KiB
JavaScript
739 lines
22 KiB
JavaScript
/**
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* @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
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* For licensing, see LICENSE.md or http://ckeditor.com/license
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*/
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/**
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* @fileOverview Undo/Redo system for saving a shapshot for document modification
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* and other recordable changes.
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*/
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( function() {
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CKEDITOR.plugins.add( 'undo', {
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lang: 'af,ar,bg,bn,bs,ca,cs,cy,da,de,el,en,en-au,en-ca,en-gb,eo,es,et,eu,fa,fi,fo,fr,fr-ca,gl,gu,he,hi,hr,hu,id,is,it,ja,ka,km,ko,ku,lt,lv,mk,mn,ms,nb,nl,no,pl,pt,pt-br,ro,ru,si,sk,sl,sq,sr,sr-latn,sv,th,tr,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
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icons: 'redo,redo-rtl,undo,undo-rtl', // %REMOVE_LINE_CORE%
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hidpi: true, // %REMOVE_LINE_CORE%
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init: function( editor ) {
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var undoManager = editor.undoManager = new UndoManager( editor );
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var undoCommand = editor.addCommand( 'undo', {
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exec: function() {
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if ( undoManager.undo() ) {
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editor.selectionChange();
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this.fire( 'afterUndo' );
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}
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},
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startDisabled: true,
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canUndo: false
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} );
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var redoCommand = editor.addCommand( 'redo', {
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exec: function() {
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if ( undoManager.redo() ) {
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editor.selectionChange();
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this.fire( 'afterRedo' );
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}
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},
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startDisabled: true,
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canUndo: false
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} );
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editor.setKeystroke( [
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[ CKEDITOR.CTRL + 90 /*Z*/, 'undo' ],
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[ CKEDITOR.CTRL + 89 /*Y*/, 'redo' ],
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[ CKEDITOR.CTRL + CKEDITOR.SHIFT + 90 /*Z*/, 'redo' ]
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] );
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undoManager.onChange = function() {
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undoCommand.setState( undoManager.undoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
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redoCommand.setState( undoManager.redoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
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};
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function recordCommand( event ) {
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// If the command hasn't been marked to not support undo.
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if ( undoManager.enabled && event.data.command.canUndo !== false )
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undoManager.save();
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}
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// We'll save snapshots before and after executing a command.
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editor.on( 'beforeCommandExec', recordCommand );
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editor.on( 'afterCommandExec', recordCommand );
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// Save snapshots before doing custom changes.
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editor.on( 'saveSnapshot', function( evt ) {
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undoManager.save( evt.data && evt.data.contentOnly );
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} );
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// Registering keydown on every document recreation.(#3844)
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editor.on( 'contentDom', function() {
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editor.editable().on( 'keydown', function( event ) {
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var keystroke = event.data.getKey();
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if ( keystroke == 8 /*Backspace*/ || keystroke == 46 /*Delete*/ )
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undoManager.type( keystroke, 0 );
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} );
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editor.editable().on( 'keypress', function( event ) {
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undoManager.type( event.data.getKey(), 1 );
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} );
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} );
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// Always save an undo snapshot - the previous mode might have
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// changed editor contents.
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editor.on( 'beforeModeUnload', function() {
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editor.mode == 'wysiwyg' && undoManager.save( true );
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} );
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function toggleUndoManager() {
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undoManager.enabled = editor.readOnly ? false : editor.mode == 'wysiwyg';
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undoManager.onChange();
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}
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// Make the undo manager available only in wysiwyg mode.
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editor.on( 'mode', toggleUndoManager );
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// Disable undo manager when in read-only mode.
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editor.on( 'readOnly', toggleUndoManager );
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if ( editor.ui.addButton ) {
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editor.ui.addButton( 'Undo', {
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label: editor.lang.undo.undo,
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command: 'undo',
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toolbar: 'undo,10'
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} );
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editor.ui.addButton( 'Redo', {
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label: editor.lang.undo.redo,
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command: 'redo',
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toolbar: 'undo,20'
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} );
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}
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/**
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* Resets the undo stack.
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*
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* @member CKEDITOR.editor
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*/
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editor.resetUndo = function() {
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// Reset the undo stack.
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undoManager.reset();
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// Create the first image.
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editor.fire( 'saveSnapshot' );
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};
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/**
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* Amends the top of the undo stack (last undo image) with the current DOM changes.
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*
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* function() {
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* editor.fire( 'saveSnapshot' );
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* editor.document.body.append(...);
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* // Makes new changes following the last undo snapshot a part of it.
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* editor.fire( 'updateSnapshot' );
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* ..
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* }
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*
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* @event updateSnapshot
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* @member CKEDITOR.editor
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* @param {CKEDITOR.editor} editor This editor instance.
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*/
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editor.on( 'updateSnapshot', function() {
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if ( undoManager.currentImage )
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undoManager.update();
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} );
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/**
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* Locks the undo manager to prevent any save/update operations.
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*
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* It is convenient to lock the undo manager before performing DOM operations
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* that should not be recored (e.g. auto paragraphing).
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*
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* See {@link CKEDITOR.plugins.undo.UndoManager#lock} for more details.
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*
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* **Note:** In order to unlock the undo manager, {@link #unlockSnapshot} has to be fired
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* the same number of times that `lockSnapshot` has been fired.
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*
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* @since 4.0
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* @event lockSnapshot
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* @member CKEDITOR.editor
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* @param {CKEDITOR.editor} editor This editor instance.
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* @param data
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* @param {Boolean} [data.dontUpdate] When set to `true` the last snapshot will not be updated
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* with the current contents and selection. Read more in the {@link CKEDITOR.plugins.undo.UndoManager#lock} method.
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*/
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editor.on( 'lockSnapshot', function( evt ) {
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undoManager.lock( evt.data && evt.data.dontUpdate );
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} );
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/**
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* Unlocks the undo manager and updates the latest snapshot.
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*
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* @since 4.0
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* @event unlockSnapshot
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* @member CKEDITOR.editor
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* @param {CKEDITOR.editor} editor This editor instance.
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*/
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editor.on( 'unlockSnapshot', undoManager.unlock, undoManager );
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}
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} );
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CKEDITOR.plugins.undo = {};
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/**
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* Undoes the snapshot which represents the current document status.
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*
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* @private
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* @class CKEDITOR.plugins.undo.Image
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* @constructor Creates an Image class instance.
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* @param {CKEDITOR.editor} editor The editor instance on which the image is created.
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* @param {Boolean} [contentsOnly] If set to `true` image will contain only contents, without selection.
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*/
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var Image = CKEDITOR.plugins.undo.Image = function( editor, contentsOnly ) {
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this.editor = editor;
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editor.fire( 'beforeUndoImage' );
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var contents = editor.getSnapshot();
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// In IE, we need to remove the expando attributes.
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if ( CKEDITOR.env.ie && contents )
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contents = contents.replace( /\s+data-cke-expando=".*?"/g, '' );
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this.contents = contents;
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if ( !contentsOnly ) {
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var selection = contents && editor.getSelection();
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this.bookmarks = selection && selection.createBookmarks2( true );
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}
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editor.fire( 'afterUndoImage' );
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};
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// Attributes that browser may changing them when setting via innerHTML.
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var protectedAttrs = /\b(?:href|src|name)="[^"]*?"/gi;
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Image.prototype = {
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equalsContent: function( otherImage ) {
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var thisContents = this.contents,
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otherContents = otherImage.contents;
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// For IE6/7 : Comparing only the protected attribute values but not the original ones.(#4522)
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if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) ) {
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thisContents = thisContents.replace( protectedAttrs, '' );
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otherContents = otherContents.replace( protectedAttrs, '' );
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}
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if ( thisContents != otherContents )
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return false;
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return true;
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},
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equalsSelection: function( otherImage ) {
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var bookmarksA = this.bookmarks,
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bookmarksB = otherImage.bookmarks;
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if ( bookmarksA || bookmarksB ) {
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if ( !bookmarksA || !bookmarksB || bookmarksA.length != bookmarksB.length )
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return false;
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for ( var i = 0; i < bookmarksA.length; i++ ) {
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var bookmarkA = bookmarksA[ i ],
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bookmarkB = bookmarksB[ i ];
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if ( bookmarkA.startOffset != bookmarkB.startOffset || bookmarkA.endOffset != bookmarkB.endOffset || !CKEDITOR.tools.arrayCompare( bookmarkA.start, bookmarkB.start ) || !CKEDITOR.tools.arrayCompare( bookmarkA.end, bookmarkB.end ) )
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return false;
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}
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}
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return true;
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}
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};
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/**
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* Main logic for the Redo/Undo feature.
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*
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* **Note:** This class is not accessible from the global scope.
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*
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* @private
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* @class CKEDITOR.plugins.undo.UndoManager
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* @constructor Creates an UndoManager class instance.
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* @param {CKEDITOR.editor} editor
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*/
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function UndoManager( editor ) {
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this.editor = editor;
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// Reset the undo stack.
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this.reset();
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}
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UndoManager.prototype = {
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/**
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* When `locked` property is not `null`, the undo manager is locked, so
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* operations like `save` or `update` are forbidden.
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*
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* The manager can be locked/unlocked by the {@link #lock} and {@link #unlock} methods.
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*
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* @private
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* @property {Object} [locked=null]
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*/
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/**
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* Handles keystroke support for the undo manager. It is called whenever a keystroke that
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* can change the editor contents is pressed.
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*
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* @param {Number} keystroke The key code.
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* @param {Boolean} isCharacter If `true`, it is a character ('a', '1', '&', ...). Otherwise it is the remove key (*Delete* or *Backspace*).
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*/
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type: function( keystroke, isCharacter ) {
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// Create undo snap for every different modifier key.
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var modifierSnapshot = ( !isCharacter && keystroke != this.lastKeystroke );
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// Create undo snap on the following cases:
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// 1. Just start to type .
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// 2. Typing some content after a modifier.
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// 3. Typing some content after make a visible selection.
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var startedTyping = !this.typing || ( isCharacter && !this.wasCharacter );
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var editor = this.editor;
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if ( startedTyping || modifierSnapshot ) {
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var beforeTypeImage = new Image( editor ),
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beforeTypeCount = this.snapshots.length;
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// Use setTimeout, so we give the necessary time to the
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// browser to insert the character into the DOM.
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CKEDITOR.tools.setTimeout( function() {
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var currentSnapshot = editor.getSnapshot();
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// In IE, we need to remove the expando attributes.
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if ( CKEDITOR.env.ie )
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currentSnapshot = currentSnapshot.replace( /\s+data-cke-expando=".*?"/g, '' );
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// If changes have taken place, while not been captured yet (#8459),
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// compensate the snapshot.
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if ( beforeTypeImage.contents != currentSnapshot && beforeTypeCount == this.snapshots.length ) {
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// It's safe to now indicate typing state.
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this.typing = true;
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// This's a special save, with specified snapshot
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// and without auto 'fireChange'.
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if ( !this.save( false, beforeTypeImage, false ) )
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// Drop future snapshots.
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this.snapshots.splice( this.index + 1, this.snapshots.length - this.index - 1 );
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this.hasUndo = true;
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this.hasRedo = false;
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this.typesCount = 1;
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this.modifiersCount = 1;
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this.onChange();
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}
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}, 0, this );
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}
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this.lastKeystroke = keystroke;
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this.wasCharacter = isCharacter;
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// Create undo snap after typed too much (over 25 times).
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if ( !isCharacter ) {
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this.typesCount = 0;
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this.modifiersCount++;
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if ( this.modifiersCount > 25 ) {
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this.save( false, null, false );
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this.modifiersCount = 1;
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} else {
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setTimeout( function() {
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editor.fire( 'change' );
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}, 0 );
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}
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} else {
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this.modifiersCount = 0;
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this.typesCount++;
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if ( this.typesCount > 25 ) {
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this.save( false, null, false );
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this.typesCount = 1;
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} else {
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setTimeout( function() {
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editor.fire( 'change' );
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}, 0 );
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}
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}
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},
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/**
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* Resets the undo stack.
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*/
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reset: function() {
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// Remember last pressed key.
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this.lastKeystroke = 0;
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// Stack for all the undo and redo snapshots, they're always created/removed
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// in consistency.
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this.snapshots = [];
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// Current snapshot history index.
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this.index = -1;
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this.limit = this.editor.config.undoStackSize || 20;
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this.currentImage = null;
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this.hasUndo = false;
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this.hasRedo = false;
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this.locked = null;
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this.resetType();
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},
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/**
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* Resets all typing variables.
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*
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* @see #type
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*/
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resetType: function() {
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this.typing = false;
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delete this.lastKeystroke;
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this.typesCount = 0;
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this.modifiersCount = 0;
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},
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fireChange: function() {
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this.hasUndo = !!this.getNextImage( true );
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this.hasRedo = !!this.getNextImage( false );
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// Reset typing
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this.resetType();
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this.onChange();
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},
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/**
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* Saves a snapshot of the document image for later retrieval.
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*/
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save: function( onContentOnly, image, autoFireChange ) {
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// Do not change snapshots stack when locked.
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if ( this.locked )
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return false;
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var snapshots = this.snapshots;
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// Get a content image.
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if ( !image )
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image = new Image( this.editor );
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// Do nothing if it was not possible to retrieve an image.
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if ( image.contents === false )
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return false;
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// Check if this is a duplicate. In such case, do nothing.
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if ( this.currentImage ) {
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if ( image.equalsContent( this.currentImage ) ) {
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if ( onContentOnly )
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return false;
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if ( image.equalsSelection( this.currentImage ) )
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return false;
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} else
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this.editor.fire( 'change' );
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}
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// Drop future snapshots.
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snapshots.splice( this.index + 1, snapshots.length - this.index - 1 );
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// If we have reached the limit, remove the oldest one.
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if ( snapshots.length == this.limit )
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snapshots.shift();
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// Add the new image, updating the current index.
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this.index = snapshots.push( image ) - 1;
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this.currentImage = image;
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if ( autoFireChange !== false )
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this.fireChange();
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return true;
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},
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restoreImage: function( image ) {
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// Bring editor focused to restore selection.
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var editor = this.editor,
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sel;
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if ( image.bookmarks ) {
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editor.focus();
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// Retrieve the selection beforehand. (#8324)
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sel = editor.getSelection();
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}
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// Start transaction - do not allow any mutations to the
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// snapshots stack done when selecting bookmarks (much probably
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// by selectionChange listener).
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this.locked = 1;
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this.editor.loadSnapshot( image.contents );
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if ( image.bookmarks )
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sel.selectBookmarks( image.bookmarks );
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else if ( CKEDITOR.env.ie ) {
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// IE BUG: If I don't set the selection to *somewhere* after setting
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// document contents, then IE would create an empty paragraph at the bottom
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// the next time the document is modified.
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var $range = this.editor.document.getBody().$.createTextRange();
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$range.collapse( true );
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$range.select();
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}
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this.locked = 0;
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this.index = image.index;
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this.currentImage = this.snapshots[ this.index ];
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// Update current image with the actual editor
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// content, since actualy content may differ from
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// the original snapshot due to dom change. (#4622)
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this.update();
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this.fireChange();
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editor.fire( 'change' );
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},
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// Get the closest available image.
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getNextImage: function( isUndo ) {
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var snapshots = this.snapshots,
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currentImage = this.currentImage,
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image, i;
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if ( currentImage ) {
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if ( isUndo ) {
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for ( i = this.index - 1; i >= 0; i-- ) {
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image = snapshots[ i ];
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if ( !currentImage.equalsContent( image ) ) {
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image.index = i;
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return image;
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}
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}
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} else {
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for ( i = this.index + 1; i < snapshots.length; i++ ) {
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image = snapshots[ i ];
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if ( !currentImage.equalsContent( image ) ) {
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image.index = i;
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return image;
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}
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}
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}
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}
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return null;
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},
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|
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/**
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* Checks the current redo state.
|
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*
|
|
* @returns {Boolean} Whether the document has a previous state to retrieve.
|
|
*/
|
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redoable: function() {
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return this.enabled && this.hasRedo;
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},
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|
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/**
|
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* Checks the current undo state.
|
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*
|
|
* @returns {Boolean} Whether the document has a future state to restore.
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|
*/
|
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undoable: function() {
|
|
return this.enabled && this.hasUndo;
|
|
},
|
|
|
|
/**
|
|
* Performs undo on current index.
|
|
*/
|
|
undo: function() {
|
|
if ( this.undoable() ) {
|
|
this.save( true );
|
|
|
|
var image = this.getNextImage( true );
|
|
if ( image )
|
|
return this.restoreImage( image ), true;
|
|
}
|
|
|
|
return false;
|
|
},
|
|
|
|
/**
|
|
* Performs redo on current index.
|
|
*/
|
|
redo: function() {
|
|
if ( this.redoable() ) {
|
|
// Try to save. If no changes have been made, the redo stack
|
|
// will not change, so it will still be redoable.
|
|
this.save( true );
|
|
|
|
// If instead we had changes, we can't redo anymore.
|
|
if ( this.redoable() ) {
|
|
var image = this.getNextImage( false );
|
|
if ( image )
|
|
return this.restoreImage( image ), true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
},
|
|
|
|
/**
|
|
* Updates the last snapshot of the undo stack with the current editor content.
|
|
*
|
|
* @param {CKEDITOR.plugins.undo.Image} [newImage] The image which will replace the current one.
|
|
* If not set defaults to image taken from editor.
|
|
*/
|
|
update: function( newImage ) {
|
|
// Do not change snapshots stack is locked.
|
|
if ( this.locked )
|
|
return;
|
|
|
|
if ( !newImage )
|
|
newImage = new Image( this.editor );
|
|
|
|
var i = this.index,
|
|
snapshots = this.snapshots;
|
|
|
|
// Find all previous snapshots made for the same content (which differ
|
|
// only by selection) and replace all of them with the current image.
|
|
while ( i > 0 && this.currentImage.equalsContent( snapshots[ i - 1 ] ) )
|
|
i -= 1;
|
|
|
|
snapshots.splice( i, this.index - i + 1, newImage );
|
|
this.index = i;
|
|
this.currentImage = newImage;
|
|
},
|
|
|
|
/**
|
|
* Locks the snapshot stack to prevent any save/update operations and when necessary,
|
|
* updates the tip of the snapshot stack with the DOM changes introduced during the
|
|
* locked period, after the {@link #unlock} method is called.
|
|
*
|
|
* It is mainly used to ensure any DOM operations that should not be recorded
|
|
* (e.g. auto paragraphing) are not added to the stack.
|
|
*
|
|
* **Note:** For every `lock` call you must call {@link #unlock} once to unlock the undo manager.
|
|
*
|
|
* @since 4.0
|
|
* @param {Boolean} [dontUpdate] When set to `true`, the last snapshot will not be updated
|
|
* with current contents and selection. By default, if undo manager was up to date when the lock started,
|
|
* the last snapshot will be updated to the current state when unlocking. This means that all changes
|
|
* done during the lock will be merged into the previous snapshot or the next one. Use this option to gain
|
|
* more control over this behavior. For example, it is possible to group changes done during the lock into
|
|
* a separate snapshot.
|
|
*/
|
|
lock: function( dontUpdate ) {
|
|
if ( !this.locked ) {
|
|
if ( dontUpdate )
|
|
this.locked = { level: 1 };
|
|
else {
|
|
// Make a contents image. Don't include bookmarks, because:
|
|
// * we don't compare them,
|
|
// * there's a chance that DOM has been changed since
|
|
// locked (e.g. fake) selection was made, so createBookmark2 could fail.
|
|
// http://dev.ckeditor.com/ticket/11027#comment:3
|
|
var imageBefore = new Image( this.editor, true );
|
|
|
|
// If current editor content matches the tip of snapshot stack,
|
|
// the stack tip must be updated by unlock, to include any changes made
|
|
// during this period.
|
|
var matchedTip = this.currentImage && this.currentImage.equalsContent( imageBefore );
|
|
|
|
this.locked = { update: matchedTip ? imageBefore : null, level: 1 };
|
|
}
|
|
}
|
|
// Increase the level of lock.
|
|
else
|
|
this.locked.level++;
|
|
},
|
|
|
|
/**
|
|
* Unlocks the snapshot stack and checks to amend the last snapshot.
|
|
*
|
|
* See {@link #lock} for more details.
|
|
*
|
|
* @since 4.0
|
|
*/
|
|
unlock: function() {
|
|
if ( this.locked ) {
|
|
// Decrease level of lock and check if equals 0, what means that undoM is completely unlocked.
|
|
if ( !--this.locked.level ) {
|
|
var updateImage = this.locked.update,
|
|
newImage = updateImage && new Image( this.editor, true );
|
|
|
|
this.locked = null;
|
|
|
|
if ( updateImage && !updateImage.equalsContent( newImage ) )
|
|
this.update();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
} )();
|
|
|
|
/**
|
|
* The number of undo steps to be saved. The higher value is set, the more
|
|
* memory is used for it.
|
|
*
|
|
* config.undoStackSize = 50;
|
|
*
|
|
* @cfg {Number} [undoStackSize=20]
|
|
* @member CKEDITOR.config
|
|
*/
|
|
|
|
/**
|
|
* Fired when the editor is about to save an undo snapshot. This event can be
|
|
* fired by plugins and customizations to make the editor save undo snapshots.
|
|
*
|
|
* @event saveSnapshot
|
|
* @member CKEDITOR.editor
|
|
* @param {CKEDITOR.editor} editor This editor instance.
|
|
*/
|
|
|
|
/**
|
|
* Fired before an undo image is to be taken. An undo image represents the
|
|
* editor state at some point. It is saved into the undo store, so the editor is
|
|
* able to recover the editor state on undo and redo operations.
|
|
*
|
|
* @since 3.5.3
|
|
* @event beforeUndoImage
|
|
* @member CKEDITOR.editor
|
|
* @param {CKEDITOR.editor} editor This editor instance.
|
|
* @see CKEDITOR.editor#afterUndoImage
|
|
*/
|
|
|
|
/**
|
|
* Fired after an undo image is taken. An undo image represents the
|
|
* editor state at some point. It is saved into the undo store, so the editor is
|
|
* able to recover the editor state on undo and redo operations.
|
|
*
|
|
* @since 3.5.3
|
|
* @event afterUndoImage
|
|
* @member CKEDITOR.editor
|
|
* @param {CKEDITOR.editor} editor This editor instance.
|
|
* @see CKEDITOR.editor#beforeUndoImage
|
|
*/
|
|
|
|
/**
|
|
* Fired when the content of the editor is changed.
|
|
*
|
|
* Due to performance reasons, it is not verified if the content really changed.
|
|
* The editor instead watches several editing actions that usually result in
|
|
* changes. This event may thus in some cases be fired when no changes happen
|
|
* or may even get fired twice.
|
|
*
|
|
* If it is important not to get the change event too often, you should compare the
|
|
* previous and the current editor content inside the event listener.
|
|
*
|
|
* @since 4.2
|
|
* @event change
|
|
* @member CKEDITOR.editor
|
|
* @param {CKEDITOR.editor} editor This editor instance.
|
|
*/
|