// ===========================================================================
// Copyright 2018 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
// ===========================================================================
//merge visible/selected layers

// reorderLayers.mel
// this script reorders all layers in the layerEditor
// alphabetically or chronologically
//
// int $alphaOrder == 1 sort alphabetically
// int $alphaOrder == 0 sort chronologically
//
global proc reorderLayers( int $alphaOrder ){
	
	// set up the variables
	//
	string $type = "Render";
	if (`tabLayout -query -selectTab DisplayLayerUITabLayout` == "DisplayLayerTab"){
		$type = "Display";
	}
	$gridLayout = ("LayerEditor" + $type + "LayerLayout");
	string $orderArray[] = `gridLayout -query -gridOrder $gridLayout`;

	// order alphabetically
	//
	if ($alphaOrder){
		// reorder the layers alphabetically
		$orderArray = `sort $orderArray`;

		// loop through the layers
		int $index = 1;
		for ($layer in $orderArray){
			// there may be null layers if a layer was deleted as the
			// other layers' connections to the layerManager are not updated
			if ($layer != "(null)"){
				// change the position of the layer in the layerEditor
				gridLayout -edit -position $layer $index $gridLayout;
				$index++;
			}
		}
	// order chronologically
	} else {
		// Render layer editor has default (master layer) displayed in the list,
		// so indeces start at 0. We have to compensate for Display layer editor,
		// because its indeces start at 1. 
		int $count = size($orderArray) + ("Display" == $type);
		
		for ($layer in $orderArray){
			// there may be null layers if a layer was deleted as the
			// other layers' connections to the layerManager are not updated
			if ($layer != "(null)"){
				// the displayOrder attr states the order layers were created in
				int $index = $count - `getAttr ($layer + ".displayOrder")`;
				// change the position of the layer in the layerEditor
				gridLayout -edit -position $layer $index $gridLayout;
			}
		}
	}
}