Added Column Classes Panel

[ben-schwen]

Hey Stan,

I added a new panel to let the user manually select his column classes out of a dropdown menu. Since I also wanted to bound these values, I had to use 'rhandsontable'.

cheers, Ben

[Stan125]

Hey Ben,

nice job. Good idea. There are two small points remaining, however:

• It's not possible to do vertical scrolling on the data types handsontable. Horizontal Scrolling works
• There seems to be a bug with making the correct R code for display on the console. Try importing inst/extdata/excel_aachen.xlsx and leaving all column classes as is. Then the following code is pasted into the console:

Best, Stani

[ben-schwen]

Hey Stani,

I reworked the code to be more consistent with your style. Now I add an additional argument to the read function instead of "hacking" the expr string on the end.

The two points you mentioned are cleared.

I also added a "Reload" button to the columns tab to give the possibility to reload the isolated data. This also added the following features:

• column types are only added, if you visit the "Data Types" tab at least once
• reload possibility of the dataset since it had to be isolated to save the changes from the handsontable edit
• possibility to use similar code to also let the user the column names and not only the types

cheers Ben