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plugin.js：源码内容
							﻿/*
Copyright (c) 2003-2009, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/
(function(){CKEDITOR.plugins.add('undo',{requires:['selection','wysiwygarea'],init:function(c){var d=new b(c),e=c.addCommand('undo',{exec:function(){if(d.undo()){c.selectionChange();this.fire('afterUndo');}},state:CKEDITOR.TRISTATE_DISABLED,canUndo:false}),f=c.addCommand('redo',{exec:function(){if(d.redo()){c.selectionChange();this.fire('afterRedo');}},state:CKEDITOR.TRISTATE_DISABLED,canUndo:false});d.onChange=function(){e.setState(d.undoable()?CKEDITOR.TRISTATE_OFF:CKEDITOR.TRISTATE_DISABLED);f.setState(d.redoable()?CKEDITOR.TRISTATE_OFF:CKEDITOR.TRISTATE_DISABLED);};function g(h){if(d.enabled&&h.data.command.canUndo!==false)d.save();};c.on('beforeCommandExec',g);c.on('afterCommandExec',g);c.on('saveSnapshot',function(){d.save();});c.on('contentDom',function(){c.document.on('keydown',function(h){if(!h.data.$.ctrlKey&&!h.data.$.metaKey)d.type(h);});});c.on('beforeModeUnload',function(){c.mode=='wysiwyg'&&d.save(true);});c.on('mode',function(){d.enabled=c.mode=='wysiwyg';d.onChange();});c.ui.addButton('Undo',{label:c.lang.undo,command:'undo'});c.ui.addButton('Redo',{label:c.lang.redo,command:'redo'});c.resetUndo=function(){d.reset();c.fire('saveSnapshot');};}});function a(c){var e=this;var d=c.getSelection();e.contents=c.getSnapshot();e.bookmarks=d&&d.createBookmarks2(true);if(CKEDITOR.env.ie)e.contents=e.contents.replace(/s+_cke_expando=".*?"/g,'');};a.prototype={equals:function(c,d){if(this.contents!=c.contents)return false;if(d)return true;var e=this.bookmarks,f=c.bookmarks;if(e||f){if(!e||!f||e.length!=f.length)return false;for(var g=0;g<e.length;g++){var h=e[g],i=f[g];if(h.startOffset!=i.startOffset||h.endOffset!=i.endOffset||!CKEDITOR.tools.arrayCompare(h.start,i.start)||!CKEDITOR.tools.arrayCompare(h.end,i.end))return false;}}return true;}};function b(c){this.editor=c;this.reset();};b.prototype={type:function(c){var d=c&&c.data.getKeystroke(),e={8:1,46:1},f=d in e,g=this.lastKeystroke in e,h=f&&d==this.lastKeystroke,i={37:1,38:1,39:1,40:1},j=d in i,k=this.lastKeystroke in i,l=!f&&!j,m=f&&!h,n=!this.typing||l&&(g||k);if(n||m){var o=new a(this.editor);CKEDITOR.tools.setTimeout(function(){var q=this;var p=q.editor.getSnapshot();if(CKEDITOR.env.ie)p=p.replace(/s+_cke_expando=".*?"/g,'');if(o.contents!=p){if(!q.save(false,o,false))q.snapshots.splice(q.index+1,q.snapshots.length-q.index-1);q.hasUndo=true;q.hasRedo=false;q.typesCount=1;q.modifiersCount=1;q.onChange();}},0,this);}this.lastKeystroke=d;if(f){this.typesCount=0;this.modifiersCount++;if(this.modifiersCount>25){this.save();
this.modifiersCount=1;}}else if(!j){this.modifiersCount=0;this.typesCount++;if(this.typesCount>25){this.save();this.typesCount=1;}}this.typing=true;},reset:function(){var c=this;c.lastKeystroke=0;c.snapshots=[];c.index=-1;c.limit=c.editor.config.undoStackSize;c.currentImage=null;c.hasUndo=false;c.hasRedo=false;c.resetType();},resetType:function(){var c=this;c.typing=false;delete c.lastKeystroke;c.typesCount=0;c.modifiersCount=0;},fireChange:function(){var c=this;c.hasUndo=!!c.getNextImage(true);c.hasRedo=!!c.getNextImage(false);c.resetType();c.onChange();},save:function(c,d,e){var g=this;var f=g.snapshots;if(!d)d=new a(g.editor);if(g.currentImage&&d.equals(g.currentImage,c))return false;f.splice(g.index+1,f.length-g.index-1);if(f.length==g.limit)f.shift();g.index=f.push(d)-1;g.currentImage=d;if(e!==false)g.fireChange();return true;},restoreImage:function(c){var e=this;e.editor.loadSnapshot(c.contents);if(c.bookmarks)e.editor.getSelection().selectBookmarks(c.bookmarks);else if(CKEDITOR.env.ie){var d=e.editor.document.getBody().$.createTextRange();d.collapse(true);d.select();}e.index=c.index;e.currentImage=c;e.fireChange();},getNextImage:function(c){var h=this;var d=h.snapshots,e=h.currentImage,f,g;if(e)if(c)for(g=h.index-1;g>=0;g--){f=d[g];if(!e.equals(f,true)){f.index=g;return f;}}else for(g=h.index+1;g<d.length;g++){f=d[g];if(!e.equals(f,true)){f.index=g;return f;}}return null;},redoable:function(){return this.enabled&&this.hasRedo;},undoable:function(){return this.enabled&&this.hasUndo;},undo:function(){var d=this;if(d.undoable()){d.save(true);var c=d.getNextImage(true);if(c)return d.restoreImage(c),true;}return false;},redo:function(){var d=this;if(d.redoable()){d.save(true);if(d.redoable()){var c=d.getNextImage(false);if(c)return d.restoreImage(c),true;}}return false;}};})();CKEDITOR.config.undoStackSize=20;

						