drag and drop between and within widgets

[zengqiang <zengqianghit@xxxxxxxxxxx>]

 
here, i copied the post from someone else, who have listed a few interesting questions:
hope that there are some hints available for any of the questions belows. thanks.
 
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I like to extend the following functionalities but I don't know how? Any clue?
1) Drag and drop an icon from a GTKIconView to the DrawingArea
2) Drag and drop the icons inside the drawingarea
3) Connect the icons to each other by selecting a connection line
4) By moving the icons the connection line moves too and is connect all the time by dragging
5) Delete the connection line between the icons
6) Copy, paste and delete functionality for all components inside the DrawingArea
It is something like Visio, AutoCAD, etc application that has a graphical display.
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