/*
Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/
/**
* @fileOverview Undo/Redo system for saving shapshot for document modification
* and other recordable changes.
*/
(function()
{
CKEDITOR.plugins.add( 'undo',
{
requires : [ 'selection', 'wysiwygarea' ],
init : function( editor )
{
var undoManager = new UndoManager( editor );
var undoCommand = editor.addCommand( 'undo',
{
exec : function()
{
if ( undoManager.undo() )
{
editor.selectionChange();
this.fire( 'afterUndo' );
}
},
state : CKEDITOR.TRISTATE_DISABLED,
canUndo : false
});
var redoCommand = editor.addCommand( 'redo',
{
exec : function()
{
if ( undoManager.redo() )
{
editor.selectionChange();
this.fire( 'afterRedo' );
}
},
state : CKEDITOR.TRISTATE_DISABLED,
canUndo : false
});
undoManager.onChange = function()
{
undoCommand.setState( undoManager.undoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
redoCommand.setState( undoManager.redoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
};
function recordCommand( event )
{
// If the command hasn't been marked to not support undo.
if ( undoManager.enabled && event.data.command.canUndo !== false )
undoManager.save();
}
// We'll save snapshots before and after executing a command.
editor.on( 'beforeCommandExec', recordCommand );
editor.on( 'afterCommandExec', recordCommand );
// Save snapshots before doing custom changes.
editor.on( 'saveSnapshot', function()
{
undoManager.save();
});
// Registering keydown on every document recreation.(#3844)
editor.on( 'contentDom', function()
{
editor.document.on( 'keydown', function( event )
{
// Do not capture CTRL hotkeys.
if ( !event.data.$.ctrlKey && !event.data.$.metaKey )
undoManager.type( event );
});
});
// Always save an undo snapshot - the previous mode might have
// changed editor contents.
editor.on( 'beforeModeUnload', function()
{
editor.mode == 'wysiwyg' && undoManager.save( true );
});
// Make the undo manager available only in wysiwyg mode.
editor.on( 'mode', function()
{
undoManager.enabled = editor.mode == 'wysiwyg';
undoManager.onChange();
});
editor.ui.addButton( 'Undo',
{
label : editor.lang.undo,
command : 'undo'
});
editor.ui.addButton( 'Redo',
{
label : editor.lang.redo,
command : 'redo'
});
editor.resetUndo = function()
{
// Reset the undo stack.
undoManager.reset();
// Create the first image.
editor.fire( 'saveSnapshot' );
};
}
});
// Gets a snapshot image which represent the current document status.
function Image( editor )
{
var contents = editor.getSnapshot(),
selection = contents && editor.getSelection();
// In IE, we need to remove the expando attributes.
CKEDITOR.env.ie && contents && ( contents = contents.replace( /\s+_cke_expando=".*?"/g, '' ) );
this.contents = contents;
this.bookmarks = selection && selection.createBookmarks2( true );
}
// Attributes that browser may changing them when setting via innerHTML.
var protectedAttrs = /\b(?:href|src|name)="[^"]*?"/gi;
Image.prototype =
{
equals : function( otherImage, contentOnly )
{
var thisContents = this.contents,
otherContents = otherImage.contents;
// For IE6/7 : Comparing only the protected attribute values but not the original ones.(#4522)
if ( CKEDITOR.env.ie && ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) )
{
thisContents = thisContents.replace( protectedAttrs, '' );
otherContents = otherContents.replace( protectedAttrs, '' );
}
if ( thisContents != otherContents )
return false;
if ( contentOnly )
return true;
var bookmarksA = this.bookmarks,
bookmarksB = otherImage.bookmarks;
if ( bookmarksA || bookmarksB )
{
if ( !bookmarksA || !bookmarksB || bookmarksA.length != bookmarksB.length )
return false;
for ( var i = 0 ; i < bookmarksA.length ; i++ )
{
var bookmarkA = bookmarksA[ i ],
bookmarkB = bookmarksB[ i ];
if (
bookmarkA.startOffset != bookmarkB.startOffset ||
bookmarkA.endOffset != bookmarkB.endOffset ||
!CKEDITOR.tools.arrayCompare( bookmarkA.start, bookmarkB.start ) ||
!CKEDITOR.tools.arrayCompare( bookmarkA.end, bookmarkB.end ) )
{
return false;
}
}
}
return true;
}
};
/**
* @constructor Main logic for Redo/Undo feature.
*/
function UndoManager( editor )
{
this.editor = editor;
// Reset the undo stack.
this.reset();
}
var editingKeyCodes = { /*Backspace*/ 8:1, /*Delete*/ 46:1 },
modifierKeyCodes = { /*Shift*/ 16:1, /*Ctrl*/ 17:1, /*Alt*/ 18:1 },
navigationKeyCodes = { 37:1, 38:1, 39:1, 40:1 }; // Arrows: L, T, R, B
UndoManager.prototype =
{
/**
* Process undo system regard keystrikes.
* @param {CKEDITOR.dom.event} event
*/
type : function( event )
{
var keystroke = event && event.data.getKey(),
isModifierKey = keystroke in modifierKeyCodes,
isEditingKey = keystroke in editingKeyCodes,
wasEditingKey = this.lastKeystroke in editingKeyCodes,
sameAsLastEditingKey = isEditingKey && keystroke == this.lastKeystroke,
// Keystrokes which navigation through contents.
isReset = keystroke in navigationKeyCodes,
wasReset = this.lastKeystroke in navigationKeyCodes,
// Keystrokes which just introduce new contents.
isContent = ( !isEditingKey && !isReset ),
// Create undo snap for every different modifier key.
modifierSnapshot = ( isEditingKey && !sameAsLastEditingKey ),
// Create undo snap on the following cases:
// 1. Just start to type .
// 2. Typing some content after a modifier.
// 3. Typing some content after make a visible selection.
startedTyping = !( isModifierKey || this.typing )
|| ( isContent && ( wasEditingKey || wasReset ) );
if ( startedTyping || modifierSnapshot )
{
var beforeTypeImage = new Image( this.editor );
// Use setTimeout, so we give the necessary time to the
// browser to insert the character into the DOM.
CKEDITOR.tools.setTimeout( function()
{
var currentSnapshot = this.editor.getSnapshot();
// In IE, we need to remove the expando attributes.
if ( CKEDITOR.env.ie )
currentSnapshot = currentSnapshot.replace( /\s+_cke_expando=".*?"/g, '' );
if ( beforeTypeImage.contents != currentSnapshot )
{
// It's safe to now indicate typing state.
this.typing = true;
// This's a special save, with specified snapshot
// and without auto 'fireChange'.
if ( !this.save( false, beforeTypeImage, false ) )
// Drop future snapshots.
this.snapshots.splice( this.index + 1, this.snapshots.length - this.index - 1 );
this.hasUndo = true;
this.hasRedo = false;
this.typesCount = 1;
this.modifiersCount = 1;
this.onChange();
}
},
0, this
);
}
this.lastKeystroke = keystroke;
// Create undo snap after typed too much (over 25 times).
if ( isEditingKey )
{
this.typesCount = 0;
this.modifiersCount++;
if ( this.modifiersCount > 25 )
{
this.save( false, null, false );
this.modifiersCount = 1;
}
}
else if ( !isReset )
{
this.modifiersCount = 0;
this.typesCount++;
if ( this.typesCount > 25 )
{
this.save( false, null, false );
this.typesCount = 1;
}
}
},
reset : function() // Reset the undo stack.
{
/**
* Remember last pressed key.
*/
this.lastKeystroke = 0;
/**
* Stack for all the undo and redo snapshots, they're always created/removed
* in consistency.
*/
this.snapshots = [];
/**
* Current snapshot history index.
*/
this.index = -1;
this.limit = this.editor.config.undoStackSize;
this.currentImage = null;
this.hasUndo = false;
this.hasRedo = false;
this.resetType();
},
/**
* Reset all states about typing.
* @see UndoManager.type
*/
resetType : function()
{
this.typing = false;
delete this.lastKeystroke;
this.typesCount = 0;
this.modifiersCount = 0;
},
fireChange : function()
{
this.hasUndo = !!this.getNextImage( true );
this.hasRedo = !!this.getNextImage( false );
// Reset typing
this.resetType();
this.onChange();
},
/**
* Save a snapshot of document image for later retrieve.
*/
save : function( onContentOnly, image, autoFireChange )
{
var snapshots = this.snapshots;
// Get a content image.
if ( !image )
image = new Image( this.editor );
// Do nothing if it was not possible to retrieve an image.
if ( image.contents === false )
return false;
// Check if this is a duplicate. In such case, do nothing.
if ( this.currentImage && image.equals( this.currentImage, onContentOnly ) )
return false;
// Drop future snapshots.
snapshots.splice( this.index + 1, snapshots.length - this.index - 1 );
// If we have reached the limit, remove the oldest one.
if ( snapshots.length == this.limit )
snapshots.shift();
// Add the new image, updating the current index.
this.index = snapshots.push( image ) - 1;
this.currentImage = image;
if ( autoFireChange !== false )
this.fireChange();
return true;
},
restoreImage : function( image )
{
this.editor.loadSnapshot( image.contents );
if ( image.bookmarks )
this.editor.getSelection().selectBookmarks( image.bookmarks );
else if ( CKEDITOR.env.ie )
{
// IE BUG: If I don't set the selection to *somewhere* after setting
// document contents, then IE would create an empty paragraph at the bottom
// the next time the document is modified.
var $range = this.editor.document.getBody().$.createTextRange();
$range.collapse( true );
$range.select();
}
this.index = image.index;
// Update current image with the actual editor
// content, since actualy content may differ from
// the original snapshot due to dom change. (#4622)
this.snapshots.splice( this.index, 1, ( this.currentImage = new Image( this.editor ) ) );
this.fireChange();
},
// Get the closest available image.
getNextImage : function( isUndo )
{
var snapshots = this.snapshots,
currentImage = this.currentImage,
image, i;
if ( currentImage )
{
if ( isUndo )
{
for ( i = this.index - 1 ; i >= 0 ; i-- )
{
image = snapshots[ i ];
if ( !currentImage.equals( image, true ) )
{
image.index = i;
return image;
}
}
}
else
{
for ( i = this.index + 1 ; i < snapshots.length ; i++ )
{
image = snapshots[ i ];
if ( !currentImage.equals( image, true ) )
{
image.index = i;
return image;
}
}
}
}
return null;
},
/**
* Check the current redo state.
* @return {Boolean} Whether the document has previous state to
* retrieve.
*/
redoable : function()
{
return this.enabled && this.hasRedo;
},
/**
* Check the current undo state.
* @return {Boolean} Whether the document has future state to restore.
*/
undoable : function()
{
return this.enabled && this.hasUndo;
},
/**
* Perform 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;
},
/**
* Perform 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;
}
};
})();
/**
* The number of undo steps to be saved. The higher this setting value the more
* memory is used for it.
* @type Number
* @default 20
* @example
* config.undoStackSize = 50;
*/
CKEDITOR.config.undoStackSize = 20;
/**
* Fired when the editor is about to save an undo snapshot. This event can be
* fired by plugins and customizations to make the editor saving undo snapshots.
* @name CKEDITOR.editor#saveSnapshot
* @event
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