﻿/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

(function()
{
  function protectFormStyles( formElement )
  {
    if ( !formElement || formElement.type != CKEDITOR.NODE_ELEMENT || formElement.getName() != 'form' )
      return [];

    var hijackRecord = [],
      hijackNames = [ 'style', 'className' ];
    for ( var i = 0 ; i < hijackNames.length ; i++ )
    {
      var name = hijackNames[i];
      var $node = formElement.$.elements.namedItem( name );
      if ( $node )
      {
        var hijackNode = new CKEDITOR.dom.element( $node );
        hijackRecord.push( [ hijackNode, hijackNode.nextSibling ] );
        hijackNode.remove();
      }
    }

    return hijackRecord;
  }

  function restoreFormStyles( formElement, hijackRecord )
  {
    if ( !formElement || formElement.type != CKEDITOR.NODE_ELEMENT || formElement.getName() != 'form' )
      return;

    if ( hijackRecord.length > 0 )
    {
      for ( var i = hijackRecord.length - 1 ; i >= 0 ; i-- )
      {
        var node = hijackRecord[i][0];
        var sibling = hijackRecord[i][1];
        if ( sibling )
          node.insertBefore( sibling );
        else
          node.appendTo( formElement );
      }
    }
  }

  function saveStyles( element, isInsideEditor )
  {
    var data = protectFormStyles( element );
    var retval = {};

    var $element = element.$;

    if ( !isInsideEditor )
    {
      retval[ 'class' ] = $element.className || '';
      $element.className = '';
    }

    retval.inline = $element.style.cssText || '';
    if ( !isInsideEditor )    // Reset any external styles that might interfere. (#2474)
      $element.style.cssText = 'position: static; overflow: visible';

    restoreFormStyles( data );
    return retval;
  }

  function restoreStyles( element, savedStyles )
  {
    var data = protectFormStyles( element );
    var $element = element.$;
    if ( 'class' in savedStyles )
      $element.className = savedStyles[ 'class' ];
    if ( 'inline' in savedStyles )
      $element.style.cssText = savedStyles.inline;
    restoreFormStyles( data );
  }

  function refreshCursor( editor )
  {
    // Refresh all editor instances on the page (#5724).
    var all = CKEDITOR.instances;
    for ( var i in all )
    {
      var one = all[ i ];
      if ( one.mode == 'wysiwyg' && !one.readOnly )
      {
        var body = one.document.getBody();
        // Refresh 'contentEditable' otherwise
        // DOM lifting breaks design mode. (#5560)
        body.setAttribute( 'contentEditable', false );
        body.setAttribute( 'contentEditable', true );
      }
    }

    if ( editor.focusManager.hasFocus )
    {
      editor.toolbox.focus();
      editor.focus();
    }
  }

  /**
   * Adding an iframe shim to this element, OR removing the existing one if already applied.
   * Note: This will only affect IE version below 7.
   */
   function createIframeShim( element )
  {
    if ( !CKEDITOR.env.ie || CKEDITOR.env.version > 6 )
      return null;

    var shim = CKEDITOR.dom.element.createFromHtml( '<iframe frameborder="0" tabindex="-1"' +
          ' src="javascript:' +
             'void((function(){' +
               'document.open();' +
               ( CKEDITOR.env.isCustomDomain() ? 'document.domain=\'' + this.getDocument().$.domain + '\';' : '' ) +
               'document.close();' +
             '})())"' +
          ' style="display:block;position:absolute;z-index:-1;' +
          'progid:DXImageTransform.Microsoft.Alpha(opacity=0);' +
          '"></iframe>' );
    return element.append( shim, true );
  }

  CKEDITOR.plugins.add( 'maximize',
  {
    init : function( editor )
    {
      var lang = editor.lang;
      var mainDocument = CKEDITOR.document,
        mainWindow = mainDocument.getWindow();

      // Saved selection and scroll position for the editing area.
      var savedSelection,
        savedScroll;

      // Saved scroll position for the outer window.
      var outerScroll;

      var shim;

      // Saved resize handler function.
      function resizeHandler()
      {
        var viewPaneSize = mainWindow.getViewPaneSize();
        shim && shim.setStyles( { width : viewPaneSize.width + 'px', height : viewPaneSize.height + 'px' } );
        editor.resize( viewPaneSize.width, viewPaneSize.height, null, true );
      }

      // Retain state after mode switches.
      var savedState = CKEDITOR.TRISTATE_OFF;

      editor.addCommand( 'maximize',
        {
          // Disabled on iOS (#8307).
          modes : { wysiwyg : !CKEDITOR.env.iOS, source : !CKEDITOR.env.iOS },
          readOnly : 1,
          editorFocus : false,
          exec : function()
          {
            var container = editor.container.getChild( 1 );
            var contents = editor.getThemeSpace( 'contents' );

            // Save current selection and scroll position in editing area.
            if ( editor.mode == 'wysiwyg' )
            {
              var selection = editor.getSelection();
              savedSelection = selection && selection.getRanges();
              savedScroll = mainWindow.getScrollPosition();
            }
            else
            {
              var $textarea = editor.textarea.$;
              savedSelection = !CKEDITOR.env.ie && [ $textarea.selectionStart, $textarea.selectionEnd ];
              savedScroll = [ $textarea.scrollLeft, $textarea.scrollTop ];
            }

            if ( this.state == CKEDITOR.TRISTATE_OFF )    // Go fullscreen if the state is off.
            {
              // Add event handler for resizing.
              mainWindow.on( 'resize', resizeHandler );

              // Save the scroll bar position.
              outerScroll = mainWindow.getScrollPosition();

              // Save and reset the styles for the entire node tree.
              var currentNode = editor.container;
              while ( ( currentNode = currentNode.getParent() ) )
              {
                currentNode.setCustomData( 'maximize_saved_styles', saveStyles( currentNode ) );
                currentNode.setStyle( 'z-index', editor.config.baseFloatZIndex - 1 );
              }
              contents.setCustomData( 'maximize_saved_styles', saveStyles( contents, true ) );
              container.setCustomData( 'maximize_saved_styles', saveStyles( container, true ) );

              // Hide scroll bars.
              var styles =
                {
                  overflow : CKEDITOR.env.webkit ? '' : 'hidden',    // #6896
                  width : 0,
                  height : 0
                };

              mainDocument.getDocumentElement().setStyles( styles );
              !CKEDITOR.env.gecko && mainDocument.getDocumentElement().setStyle( 'position', 'fixed' );
              !( CKEDITOR.env.gecko && CKEDITOR.env.quirks ) && mainDocument.getBody().setStyles( styles );

              // Scroll to the top left (IE needs some time for it - #4923).
              CKEDITOR.env.ie ?
                setTimeout( function() { mainWindow.$.scrollTo( 0, 0 ); }, 0 ) :
                mainWindow.$.scrollTo( 0, 0 );

              // Resize and move to top left.
              // Special treatment for FF Quirks (#7284)
              container.setStyle( 'position', CKEDITOR.env.gecko && CKEDITOR.env.quirks ? 'fixed' : 'absolute' );
              container.$.offsetLeft;      // SAFARI BUG: See #2066.
              container.setStyles(
                {
                  'z-index' : editor.config.baseFloatZIndex - 1,
                  left : '0px',
                  top : '0px'
                } );

              shim =  createIframeShim( container );    // IE6 select element penetration when maximized. (#4459)

              // Add cke_maximized class before resize handle since that will change things sizes (#5580)
              container.addClass( 'cke_maximized' );

              resizeHandler();

              // Still not top left? Fix it. (Bug #174)
              var offset = container.getDocumentPosition();
              container.setStyles(
                {
                  left : ( -1 * offset.x ) + 'px',
                  top : ( -1 * offset.y ) + 'px'
                } );

              // Fixing positioning editor chrome in Firefox break design mode. (#5149)
              CKEDITOR.env.gecko && refreshCursor( editor );

            }
            else if ( this.state == CKEDITOR.TRISTATE_ON )  // Restore from fullscreen if the state is on.
            {
              // Remove event handler for resizing.
              mainWindow.removeListener( 'resize', resizeHandler );

              // Restore CSS styles for the entire node tree.
              var editorElements = [ contents, container ];
              for ( var i = 0 ; i < editorElements.length ; i++ )
              {
                restoreStyles( editorElements[i], editorElements[i].getCustomData( 'maximize_saved_styles' ) );
                editorElements[i].removeCustomData( 'maximize_saved_styles' );
              }

              currentNode = editor.container;
              while ( ( currentNode = currentNode.getParent() ) )
              {
                restoreStyles( currentNode, currentNode.getCustomData( 'maximize_saved_styles' ) );
                currentNode.removeCustomData( 'maximize_saved_styles' );
              }

              // Restore the window scroll position.
              CKEDITOR.env.ie ?
                setTimeout( function() { mainWindow.$.scrollTo( outerScroll.x, outerScroll.y ); }, 0 ) :
                mainWindow.$.scrollTo( outerScroll.x, outerScroll.y );

              // Remove cke_maximized class.
              container.removeClass( 'cke_maximized' );

              // Webkit requires a re-layout on editor chrome. (#6695)
              if ( CKEDITOR.env.webkit )
              {
                container.setStyle( 'display', 'inline' );
                setTimeout( function(){ container.setStyle( 'display', 'block' ); }, 0 );
              }

              if ( shim )
              {
                shim.remove();
                shim = null;
              }

              // Emit a resize event, because this time the size is modified in
              // restoreStyles.
              editor.fire( 'resize' );
            }

            this.toggleState();

            // Toggle button label.
            var button = this.uiItems[ 0 ];
            // Only try to change the button if it exists (#6166)
            if( button )
            {
              var label = ( this.state == CKEDITOR.TRISTATE_OFF )
                ? lang.maximize : lang.minimize;
              var buttonNode = editor.element.getDocument().getById( button._.id );
              buttonNode.getChild( 1 ).setHtml( label );
              buttonNode.setAttribute( 'title', label );
              buttonNode.setAttribute( 'href', 'javascript:void("' + label + '");' );
            }

            // Restore selection and scroll position in editing area.
            if ( editor.mode == 'wysiwyg' )
            {
              if ( savedSelection )
              {
                // Fixing positioning editor chrome in Firefox break design mode. (#5149)
                CKEDITOR.env.gecko && refreshCursor( editor );

                editor.getSelection().selectRanges(savedSelection);
                var element = editor.getSelection().getStartElement();
                element && element.scrollIntoView( true );
              }

              else
                mainWindow.$.scrollTo( savedScroll.x, savedScroll.y );
            }
            else
            {
              if ( savedSelection )
              {
                $textarea.selectionStart = savedSelection[0];
                $textarea.selectionEnd = savedSelection[1];
              }
              $textarea.scrollLeft = savedScroll[0];
              $textarea.scrollTop = savedScroll[1];
            }

            savedSelection = savedScroll = null;
            savedState = this.state;
          },
          canUndo : false
        } );

      editor.ui.addButton( 'Maximize',
        {
          label : lang.maximize,
          command : 'maximize'
        } );

      // Restore the command state after mode change, unless it has been changed to disabled (#6467)
      editor.on( 'mode', function()
        {
          var command = editor.getCommand( 'maximize' );
          command.setState( command.state == CKEDITOR.TRISTATE_DISABLED ? CKEDITOR.TRISTATE_DISABLED : savedState );
        }, null, null, 100 );
    }
  } );
})();
