crazylazy.info

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Modern GUIs need Drag and Drop

The following is an example for a drag & drop action with PyQt4. It uses paramiko for SSH interactions. I'm well aware that it won't work on Windows that way. But that's a Windows problem. I'm also well aware that there's a password in this file. Give it a try.
The source is at GitHub. The indention seems to be broken there. But that's a GitHub problem. It seems to be broken here, too. But that's a Drupal problem. ;). Actually it isn't even a problem.

Just the imports. The os module is necessary if you want paramiko to use your private ssh-key. The sys module is needed due argv:

I pretty much guess that's self-explaining now. That's the standard header to initiate the form:

To make an application accept drop-acrions simply define this in an __init__. Compared to Cocoa e. g. this is really trivial.

- That's it to define the event-actions. If a user drops a file, handle it:

So... paramiko is able to use your private key, as stated in the comment. It also supports passwords. Surely you know, that Base64 isn't used in SSH ;). However in this case it makes sense.

The interesting point here are the text conversions, which are necessary. You see that str(destionation_path) converts self.ui.lineEdit.text(). That's confusing at the beginning, but Qt handles text as unicode. Most Python installation don't.
Paramiko wants an ASCII string. So you convert this into a standard Python string-type. Furthermore you see that the string-operations introduced in nearly every Python tutorial I ever read are more than essential. Even in GUI programming they're central.

If you take a look at the for-loop: destination_path = destination_path + patharray[len(patharray)-1] -> makes sftp.put keep the filename and put it into the destination_path. You need the last element, which is len(element)-1.
The URI string normally starts with "file://". You don't want to pass these identifier-string to sftp.put. So you start at th 7th (file = file[7:]) position. That converts the URI into a general Unix path.

The rest of the app is trivial. Starting Qt Designer, clicking: the GUI just needs a lineEdit and a textEdit. The whole project including the QT Designer files are at GitHub. Surely you can enhance it with a progress bar, a menu-bar, preferences and extend it into a full featured sftp client.

This is just a general snippet on how to implement Drag and Drop actions with Qt and Python. If you want to dive into it, enhance it and:

Have fun,
wishi