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/* * FCKeditor - The text editor for Internet - http://www.fckeditor.net * Copyright (C) 2003-2010 Frederico Caldeira Knabben * * == BEGIN LICENSE == * * Licensed under the terms of any of the following licenses at your * choice: * * - GNU General Public License Version 2 or later (the "GPL") * http://www.gnu.org/licenses/gpl.html * * - GNU Lesser General Public License Version 2.1 or later (the "LGPL") * http://www.gnu.org/licenses/lgpl.html * * - Mozilla Public License Version 1.1 or later (the "MPL") * http://www.mozilla.org/MPL/MPL-1.1.html * * == END LICENSE == * * Control keyboard keystroke combinations. */ var FCKKeystrokeHandler = function( cancelCtrlDefaults ) { this.Keystrokes = new Object() ; this.CancelCtrlDefaults = ( cancelCtrlDefaults !== false ) ; } /* * Listen to keystroke events in an element or DOM document object. * @target: The element or document to listen to keystroke events. */ FCKKeystrokeHandler.prototype.AttachToElement = function( target ) { // For newer browsers, it is enough to listen to the keydown event only. // Some browsers instead, don't cancel key events in the keydown, but in the // keypress. So we must do a longer trip in those cases. FCKTools.AddEventListenerEx( target, 'keydown', _FCKKeystrokeHandler_OnKeyDown, this ) ; if ( FCKBrowserInfo.IsGecko10 || FCKBrowserInfo.IsOpera || ( FCKBrowserInfo.IsGecko && FCKBrowserInfo.IsMac ) ) FCKTools.AddEventListenerEx( target, 'keypress', _FCKKeystrokeHandler_OnKeyPress, this ) ; } /* * Sets a list of keystrokes. It can receive either a single array or "n" * arguments, each one being an array of 1 or 2 elemenst. The first element * is the keystroke combination, and the second is the value to assign to it. * If the second element is missing, the keystroke definition is removed. */ FCKKeystrokeHandler.prototype.SetKeystrokes = function() { // Look through the arguments. for ( var i = 0 ; i < arguments.length ; i++ ) { var keyDef = arguments[i] ; // If the configuration for the keystrokes is missing some element or has any extra comma // this item won't be valid, so skip it and keep on processing. if ( !keyDef ) continue ; if ( typeof( keyDef[0] ) == 'object' ) // It is an array with arrays defining the keystrokes. this.SetKeystrokes.apply( this, keyDef ) ; else { if ( keyDef.length == 1 ) // If it has only one element, remove the keystroke. delete this.Keystrokes[ keyDef[0] ] ; else // Otherwise add it. this.Keystrokes[ keyDef[0] ] = keyDef[1] === true ? true : keyDef ; } } } function _FCKKeystrokeHandler_OnKeyDown( ev, keystrokeHandler ) { // Get the key code. var keystroke = ev.keyCode || ev.which ; // Combine it with the CTRL, SHIFT and ALT states. var keyModifiers = 0 ; if ( ev.ctrlKey || ev.metaKey ) keyModifiers += CTRL ; if ( ev.shiftKey ) keyModifiers += SHIFT ; if ( ev.altKey ) keyModifiers += ALT ; var keyCombination = keystroke + keyModifiers ; var cancelIt = keystrokeHandler._CancelIt = false ; // Look for its definition availability. var keystrokeValue = keystrokeHandler.Keystrokes[ keyCombination ] ; // FCKDebug.Output( 'KeyDown: ' + keyCombination + ' - Value: ' + keystrokeValue ) ; // If the keystroke is defined if ( keystrokeValue ) { // If the keystroke has been explicitly set to "true" OR calling the // "OnKeystroke" event, it doesn't return "true", the default behavior // must be preserved. if ( keystrokeValue === true || !( keystrokeHandler.OnKeystroke && keystrokeHandler.OnKeystroke.apply( keystrokeHandler, keystrokeValue ) ) ) return true ; cancelIt = true ; } // By default, it will cancel all combinations with the CTRL key only (except positioning keys). if ( cancelIt || ( keystrokeHandler.CancelCtrlDefaults && keyModifiers == CTRL && ( keystroke < 33 || keystroke > 40 ) ) ) { keystrokeHandler._CancelIt = true ; if ( ev.preventDefault ) return ev.preventDefault() ; ev.returnValue = false ; ev.cancelBubble = true ; return false ; } return true ; } function _FCKKeystrokeHandler_OnKeyPress( ev, keystrokeHandler ) { if ( keystrokeHandler._CancelIt ) { // FCKDebug.Output( 'KeyPress Cancel', 'Red') ; if ( ev.preventDefault ) return ev.preventDefault() ; return false ; } return true ; }