/// <summary>
/// DragDrop: gets the filename of the object drawn over the control.
/// Checks the filename, if its contents can be shown in the cloud.
/// Estimates the language of the text file and the probabilty that it is plain text or HTML.
/// Reads the file appropriately and shows the words in the cloud.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TagCloudControl_DragDrop(object sender, DragEventArgs e)
{
try
{
Array a = (Array)e.Data.GetData(DataFormats.FileDrop);
if (a != null)
{
// get the drag & drop filename
string filename = a.GetValue(0).ToString();
// check, if it is a non-showable file format
if (FileFormats.IsGraphicFile(filename) || FileFormats.IsAudioFile(filename) || FileFormats.IsVideoFile(filename) ||
FileFormats.IsCompressedFile(filename) || FileFormats.IsProgramFile(filename) || FileFormats.IsDocumentFile(filename) ||
FileFormats.IsSystemFile(filename) || FileFormats.IsDatabaseFile(filename))
{
MessageBox.Show("Sorry, but\n" + filename + "\nhas a contents, that can not be shown in the cloud.", "No display in cloud", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
bool ishtml;
TextLanguage language;
// check text / HTML and German / English
TXTHandling.GetFileTypeAndLanguage(filename, out ishtml, out language);
if (ishtml)
{
ReadHTMLFile(filename, language);
}
else
{
ReadTxtFile(filename, language);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error in DragDrop function: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}