<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="286" height="276">
	<mx:TextInput x="25" y="71" displayAsPassword="false" width="160" id="i_dir" editable="true" enabled="true"/>
	<mx:TextInput x="25" y="112" displayAsPassword="false" width="160" id="i_dir0" editable="true" enabled="true"/>
	<mx:Text x="25" y="96" text="Save directory" width="120" textAlign="left"/>
	<mx:Text x="25" y="55" text="PNG directory" width="120" textAlign="left"/>
	<mx:Text x="25" y="16" text="Auto PNG Cropper" width="245" textAlign="left" height="33" fontSize="20" fontWeight="bold"/>
	<mx:Button x="193" y="71" label="Browse" click="browseDir()"/>
	<mx:Button x="193" y="111" label="Browse" click="browseSaveDir()"/>
	<mx:Button x="25" y="233" label="Crop!" click="crop()"/>
	<mx:Button x="213" y="233" label="Exit" click="NativeApplication.nativeApplication.exit()"/>
	<mx:Script>
		<![CDATA[
			import mx.messaging.AbstractConsumer;
			import com.adobe.images.PNGEncoder;
		
			private var PNGs:Array;
			private var curPNG:Number;
			private var output:String;
			
			private function browseDir():void
        	{
        		var dir:File	= new File();
        		dir.addEventListener(Event.SELECT, directorySelected);
        		dir.browseForDirectory('Choose directory to save screenshots in');
        	}
        	private function directorySelected(event:Event):void
        	{
        		var dir:File 	= event.target as File;
        		//trace(dir.nativePath);
        		i_dir.text 		= dir.nativePath;
        		i_dir0.text 	= dir.nativePath;
        	}
			private function browseSaveDir():void
        	{
        		var dir:File	= new File();
        		dir.addEventListener(Event.SELECT, saveDirectorySelected);
        		dir.browseForDirectory('Choose directory to save screenshots in');
        	}
        	private function saveDirectorySelected(event:Event):void
        	{
        		var dir:File 	= event.target as File;
        		i_dir0.text 	= dir.nativePath;
        	}
        	private function crop():void
        	{
        		PNGs			= new Array();
        		curPNG			= 0;
        		output			= '//image,start x, start y, crop x, crop y\n';
        		
        		var dir:File 	= new File(i_dir.text);
        		var list:Array 	= dir.getDirectoryListing();
        		for (var i:uint = 0; i < list.length; i++) {
    				if (list[i].extension.toLowerCase() == 'png')
    					PNGs.push( {name:list[i].name, path:list[i].nativePath} );
				}
				
        		progressbar.setProgress(0, PNGs.length);
				cropPNG();
        	}
        	private function cropPNG():void
        	{
        		PNGs[curPNG].loader		= new Loader();
        		PNGs[curPNG].loader.contentLoaderInfo.addEventListener(Event.COMPLETE, imageLoaded);
        		PNGs[curPNG].loader.load( new URLRequest(PNGs[curPNG].path) );
        		trace( PNGs[curPNG].name );
 
       			progressbar.label	="Cropping image "+(curPNG+1)+" of %2 (%3%%)"; 

        	}
        	private function imageLoaded(e:Event):void
        	{
        		//trace( curPNG+': '+PNGs[curPNG].loader );
				//trace( [PNGs[curPNG].loader.width, PNGs[curPNG].loader.height] );
				
				PNGs[curPNG].width			= PNGs[curPNG].loader.width;
				PNGs[curPNG].height			= PNGs[curPNG].loader.height;
				
				var bmd:BitmapData			= new BitmapData(PNGs[curPNG].loader.width, PNGs[curPNG].loader.height, true, null);
				bmd.draw(PNGs[curPNG].loader);
				
				PNGs[curPNG].left 			= Math.max(0, findLeft(bmd, PNGs[curPNG].width, PNGs[curPNG].height)-1);
				PNGs[curPNG].right			= Math.min(PNGs[curPNG].width, findRight(bmd, PNGs[curPNG].width, PNGs[curPNG].height)+1);
				PNGs[curPNG].top 			= Math.max(0, findTop(bmd, PNGs[curPNG].width, PNGs[curPNG].height)-1);
				PNGs[curPNG].bottom			= Math.min(PNGs[curPNG].height, findBottom(bmd, PNGs[curPNG].width, PNGs[curPNG].height)+1);
				    
				var matrix:Matrix 			= new Matrix();
				matrix.translate(-PNGs[curPNG].left+1, -PNGs[curPNG].top+1);
				var bmdnew:BitmapData		= new BitmapData(PNGs[curPNG].right-PNGs[curPNG].left+2, PNGs[curPNG].bottom-PNGs[curPNG].top+2, true, null);
				bmdnew.draw(PNGs[curPNG].loader, matrix, new ColorTransform, "normal", new Rectangle(0, 0, PNGs[curPNG].right-PNGs[curPNG].left+2, PNGs[curPNG].bottom-PNGs[curPNG].top+2));
				var imgByteArray:ByteArray 	= PNGEncoder.encode(bmdnew);
				
				// write png
				var fl:File 		= File.documentsDirectory.resolvePath(i_dir0.text+'/'+PNGs[curPNG].name);
				var fs:FileStream 	= new FileStream();
				try
				{
					fs.open(fl, FileMode.WRITE);
					fs.writeBytes(imgByteArray);
					fs.close();
				} 
				catch(e:Error) 
				{
					trace('ERROR: '+e.message);
				}
				
				// add to output log
				output				+= PNGs[curPNG].name+","+PNGs[curPNG].left+","+PNGs[curPNG].top+","+PNGs[curPNG].right+","+PNGs[curPNG].bottom+"\n";
				
				// next one        		
        		if (curPNG < PNGs.length-1)
        		{
        			curPNG++;
        			progressbar.setProgress(curPNG, PNGs.length);
        			cropPNG();
        		} 
        		else
        		{
        			progressbar.setProgress(PNGs.length, PNGs.length);
        			progressbar.label	= 'Cropping done, creating logfile';
        			
					// write data file
					output 				= output.replace(/\r/g, "\n");
					output 				= output.replace(/\n/g, File.lineEnding); 
					var tfl:File 		= File.documentsDirectory.resolvePath(i_dir0.text+'/log.txt');
					try
					{
						fs.openAsync(tfl, FileMode.WRITE);
						fs.writeUTFBytes(output);
						fs.close();
						
        				progressbar.label	= 'All acions done';
					} 
					catch(e:Error) 
					{
						trace('ERROR: '+e.message);
					}        			
        		}
        	}
        	private function findLeft(bmd:BitmapData, w:Number, h:Number):Number
        	{
        		for (var x:Number=0; x<w; x++)
        		{
        			for (var y:Number=0; y<h; y++)
        			{
        				if ( bmd.getPixel32(x, y).toString(16) != '0' )
        					return x;
        			}
        		}
        		return 0;
        	}
        	private function findRight(bmd:BitmapData, w:Number, h:Number):Number
        	{
        		for (var x:Number=w-1; x>0; x--)
        		{
        			for (var y:Number=0; y<h; y++)
        			{
        				if ( bmd.getPixel32(x, y).toString(16) != '0' )
        					return x;
        			}
        		}
        		return w;
        	}
        	private function findTop(bmd:BitmapData, w:Number, h:Number):Number
        	{
    			for (var y:Number=0; y<h; y++)
    			{
	        		for (var x:Number=0; x<w; x++)
	        		{
        				if ( bmd.getPixel32(x, y).toString(16) != '0' )
        					return y;
        			}
        		}
        		return 0;
        	}
        	private function findBottom(bmd:BitmapData, w:Number, h:Number):Number
        	{
    			for (var y:Number=h; y>0; y--)
    			{
	        		for (var x:Number=0; x<w; x++)
	        		{
        				if ( bmd.getPixel32(x, y).toString(16) != '0' )
        					return y;
        			}
        		}
        		return h;
        	}
		]]>
	</mx:Script>
	<mx:ProgressBar x="42" y="177" label=" " id="progressbar" mode="manual" enabled="true"/>
</mx:WindowedApplication>