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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Windows.Forms;
namespace QuickRoute.Controls
{
public class DragDropManager
{
public List<string> GetDroppedFileNames(DragEventArgs e, IEnumerable<string> allowedFileExtensions = null)
{
var fileNames = new List<string>();
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
fileNames.AddRange((string[]) e.Data.GetData(DataFormats.FileDrop));
fileNames = FilterFileNamesByExtension(fileNames, allowedFileExtensions);
}
if (fileNames.Count == 0 && e.Data.GetDataPresent(DataFormats.StringFormat))
{
var fileName = (string)e.Data.GetData(DataFormats.StringFormat);
if (fileName.StartsWith("http") || File.Exists(fileName)) fileNames.Add(fileName);
}
if (fileNames.Count == 0 && e.Data.GetDataPresent("FileName"))
{
fileNames.AddRange((string[])e.Data.GetData("FileName"));
}
return fileNames;
}
private static List<string> FilterFileNamesByExtension(IEnumerable<string> fileNames, IEnumerable<string> allowedFileExtensions)
{
if (fileNames == null) return null;
if (allowedFileExtensions == null) return new List<string>(fileNames);
var result = new List<string>();
// find first file with correct extension
foreach (var fileName in fileNames)
{
foreach(var fileExtension in allowedFileExtensions)
{
if (fileName.EndsWith(fileExtension, StringComparison.InvariantCultureIgnoreCase))
{
result.Add(fileName);
break;
}
}
}
return result;
}
}
}
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