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/*
Copyright (c) 2003-2012, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

CKEDITOR.dialog.add( 'colordialog', function( editor )
	{
		// Define some shorthands.
		var $el = CKEDITOR.dom.element,
			$doc = CKEDITOR.document,
			lang = editor.lang.colordialog;

// Reference the dialog.
		var dialog;

var spacer =
		{
			type : 'html',
			html : ' '
		};

var selected;

function clearSelected()
		{
			$doc.getById( selHiColorId ).removeStyle( 'background-color' );
			dialog.getContentElement( 'picker', 'selectedColor' ).setValue( '' );
			selected && selected.removeAttribute( 'aria-selected' );
			selected = null;
		}

function updateSelected( evt )
		{
			var target = evt.data.getTarget(),
				color;

if ( target.getName() == 'td' &&
				 ( color = target.getChild( 0 ).getHtml() ) )
			{
				selected = target;
				selected.setAttribute( 'aria-selected', true );
				dialog.getContentElement( 'picker', 'selectedColor' ).setValue( color );
			}
		}

// Basing black-white decision off of luma scheme using the Rec. 709 version
		function whiteOrBlack( color )
		{
			color = color.replace( /^#/, '' );
			for ( var i = 0, rgb = []; i <= 2; i++ )
				rgb[i] = parseInt( color.substr( i * 2, 2 ), 16 );
			var luma = (0.2126 * rgb[0]) + (0.7152 * rgb[1]) + (0.0722 * rgb[2]);
			return '#' + ( luma >= 165 ? '000' : 'fff' );
		}

// Distinguish focused and hover states.
		var focused, hovered;

// Apply highlight style.
		function updateHighlight( event )
		{
			// Convert to event.
			!event.name && ( event = new CKEDITOR.event( event ) );

var isFocus = !(/mouse/).test( event.name ),
				target = event.data.getTarget(),
				color;

if ( target.getName() == 'td' && ( color = target.getChild( 0 ).getHtml() ) )
			{
				removeHighlight( event );

isFocus ? focused = target : hovered = target;

// Apply outline style to show focus.
				if ( isFocus )
				{
					target.setStyle( 'border-color', whiteOrBlack( color ) );
					target.setStyle( 'border-style', 'dotted' );
				}

$doc.getById( hicolorId ).setStyle( 'background-color', color );
				$doc.getById( hicolorTextId ).setHtml( color );
			}
		}

function clearHighlight()
		{
			var color = focused.getChild( 0 ).getHtml();
			focused.setStyle( 'border-color', color );
			focused.setStyle( 'border-style', 'solid' );
			$doc.getById( hicolorId ).removeStyle( 'background-color' );
			$doc.getById( hicolorTextId ).setHtml( ' ' );
			focused = null;
		}

// Remove previously focused style.
		function removeHighlight( event )
		{
			var isFocus = !(/mouse/).test( event.name ),
				target = isFocus && focused;

if ( target )
			{
				var color = target.getChild( 0 ).getHtml();
				target.setStyle( 'border-color', color );
				target.setStyle( 'border-style', 'solid' );
			}

if ( ! ( focused || hovered ) )
			{
				$doc.getById( hicolorId ).removeStyle( 'background-color' );
				$doc.getById( hicolorTextId ).setHtml( ' ' );
			}
		}

function onKeyStrokes( evt )
		{
			var domEvt = evt.data;

var element = domEvt.getTarget();
			var relative, nodeToMove;
			var keystroke = domEvt.getKeystroke(),
				rtl = editor.lang.dir == 'rtl';

switch ( keystroke )
			{
				// UP-ARROW
				case 38 :
					// relative is TR
					if ( ( relative = element.getParent().getPrevious() ) )
					{
						nodeToMove = relative.getChild( [ element.getIndex() ] );
						nodeToMove.focus();
					}
					domEvt.preventDefault();
					break;
				// DOWN-ARROW
				case 40 :
					// relative is TR
					if ( ( relative = element.getParent().getNext() ) )
					{
						nodeToMove = relative.getChild( [ element.getIndex() ] );
						if ( nodeToMove && nodeToMove.type == 1 )
						{
							nodeToMove.focus();
						}
					}
					domEvt.preventDefault();
					break;

// SPACE
				// ENTER
				case 32 :
				case 13 :
					updateSelected( evt );
					domEvt.preventDefault();
					break;

// RIGHT-ARROW
				case rtl ? 37 : 39 :
					// relative is TD
					if ( ( nodeToMove = element.getNext() ) )
					{
						if ( nodeToMove.type == 1 )
						{
							nodeToMove.focus();
							domEvt.preventDefault( true );
						}
					}
					// relative is TR
					else if ( ( relative = element.getParent().getNext() ) )
					{
						nodeToMove = relative.getChild( [ 0 ] );
						if ( nodeToMove && nodeToMove.type == 1 )
						{
							nodeToMove.focus();
							domEvt.preventDefault( true );
						}
					}
					break;

// LEFT-ARROW
				case rtl ? 39 : 37 :
					// relative is TD
					if ( ( nodeToMove = element.getPrevious() ) )
					{
						nodeToMove.focus();
						domEvt.preventDefault( true );
					}
					// relative is TR
					else if ( ( relative = element.getParent().getPrevious() ) )
					{
						nodeToMove = relative.getLast();
						nodeToMove.focus();
						domEvt.preventDefault( true );
					}
					break;
				default :
					// Do not stop not handled events.
					return;
			}
		}

function createColorTable()
		{
			table = CKEDITOR.dom.element.createFromHtml
			(
				'<table tabIndex="-1" aria-label="' + lang.options + '"' +
				' role="grid" style="border-collapse:separate;" cellspacing="0">' +
				'<caption class="cke_voice_label">' + lang.options + '</caption>' +
				'<tbody role="presentation"></tbody></table>'
			);

table.on( 'mouseover', updateHighlight );
			table.on( 'mouseout', removeHighlight );

// Create the base colors array.
			var aColors = [ '00', '33', '66', '99', 'cc', 'ff' ];

// This function combines two ranges of three values from the color array into a row.
			function appendColorRow( rangeA, rangeB )
			{
				for ( var i = rangeA ; i < rangeA + 3 ; i++ )
				{
					var row = new $el( table.$.insertRow( -1 ) );
					row.setAttribute( 'role', 'row' );

for ( var j = rangeB ; j < rangeB + 3 ; j++ )
					{
						for ( var n = 0 ; n < 6 ; n++ )
						{
							appendColorCell( row.$, '#' + aColors[j] + aColors[n] + aColors[i] );
						}
					}
				}
			}

// This function create a single color cell in the color table.
			function appendColorCell( targetRow, color )
			{
				var cell = new $el( targetRow.insertCell( -1 ) );
				cell.setAttribute( 'class', 'ColorCell' );
				cell.setAttribute( 'tabIndex', -1 );
				cell.setAttribute( 'role', 'gridcell' );

cell.on( 'keydown', onKeyStrokes );
				cell.on( 'click', updateSelected );
				cell.on( 'focus', updateHighlight );
				cell.on( 'blur', removeHighlight );

cell.setStyle( 'background-color', color );
				cell.setStyle( 'border', '1px solid ' + color );

cell.setStyle( 'width', '14px' );
				cell.setStyle( 'height', '14px' );

var colorLabel = numbering( 'color_table_cell' );
				cell.setAttribute( 'aria-labelledby',colorLabel );
				cell.append( CKEDITOR.dom.element.createFromHtml( '<span id="' + colorLabel + '" class="cke_voice_label">' + color + '</span>', CKEDITOR.document ) );
			}

appendColorRow( 0, 0 );
			appendColorRow( 3, 0 );
			appendColorRow( 0, 3 );
			appendColorRow( 3, 3 );

// Create the last row.
			var oRow = new $el( table.$.insertRow( -1 ) ) ;
			oRow.setAttribute( 'role', 'row' );

// Create the gray scale colors cells.
			for ( var n = 0 ; n < 6 ; n++ )
			{
				appendColorCell( oRow.$, '#' + aColors[n] + aColors[n] + aColors[n] ) ;
			}

// Fill the row with black cells.
			for ( var i = 0 ; i < 12 ; i++ )
			{
				appendColorCell( oRow.$, '#000000' ) ;
			}
		}

var numbering = function( id )
			{
				return CKEDITOR.tools.getNextId() + '_' + id;
			},
			hicolorId = numbering( 'hicolor' ),
			hicolorTextId = numbering( 'hicolortext' ),
			selHiColorId = numbering( 'selhicolor' ),
			table;

createColorTable();

return {
			title : lang.title,
			minWidth : 360,
			minHeight : 220,
			onLoad : function()
			{
				// Update reference.
				dialog = this;
			},
			onHide : function()
			{
				clearSelected();
				clearHighlight();
			},
			contents : [
				{
					id : 'picker',
					label : lang.title,
					accessKey : 'I',
					elements :
					[
						{
							type : 'hbox',
							padding : 0,
							widths : [ '70%', '10%', '30%' ],
							children :
							[
								{
									type : 'html',
									html :	'<div></div>',
									onLoad : function()
									{
										CKEDITOR.document.getById( this.domId ).append( table );
									},
									focus : function()
									{
										// Restore the previously focused cell,
										// otherwise put the initial focus on the first table cell.
										( focused || this.getElement().getElementsByTag( 'td' ).getItem( 0 ) ).focus();
									}
								},
								spacer,
								{
									type : 'vbox',
									padding : 0,
									widths : [ '70%', '5%', '25%' ],
									children :
									[
										{
											type : 'html',
											html : '<span>' + lang.highlight +'</span>\
												<div id="' + hicolorId + '" style="border: 1px solid; height: 74px; width: 74px;"></div>\
												<div id="' + hicolorTextId + '"> </div><span>' + lang.selected + '</span>\
												<div id="' + selHiColorId + '" style="border: 1px solid; height: 20px; width: 74px;"></div>'
										},
										{
											type : 'text',
											label : lang.selected,
											labelStyle: 'display:none',
											id : 'selectedColor',
											style : 'width: 74px',
											onChange : function()
											{
												// Try to update color preview with new value. If fails, then set it no none.
												try
												{
													$doc.getById( selHiColorId ).setStyle( 'background-color', this.getValue() );
												}
												catch ( e )
												{
													clearSelected();
												}
											}
										},
										spacer,
										{
											type : 'button',
											id : 'clear',
											style : 'margin-top: 5px',
											label : lang.clear,
											onClick : clearSelected
										}
									]
								}
							]
						}
					]
				}
			]
		};
	}
	);