I have three tree views in my application and every view have its model which basically looks like this:

Qt Code: 
  1. |
  2. |
  3. |--------Printer1
  4. |             |
  5. |             |------------Tray1
  6. |             |                 |
  7. |             |                 |----------Paper type
  8. |             |                 |----------value
  9. |             |                 |----------Amount
  10. |             |                 |----------value
  11. |             |
  12. |             |------------Tray2
  13. |                               |
  14. |                               |----------Paper type
  15. |                               |----------value
  16. |                               |----------Amount
  17. |                               |----------value
  18. |
  19. |--------Printer2
  20. |             |
  21. |             |------------Tray1
  22. |             |                 |
  23. |             |                 |----------Paper type
  24. |             |                 |----------value
  25. |             |                 |----------Amount
  26. |             |                 |----------value
  27. |             |
  28. |             |------------Tray2
  29. |                               |
  30. |                               |----------Paper type
  31. |                               |----------value
  32. |                               |----------Amount
  33. |                               |----------value
  34. |
  35. |--------Printer3
  36.               |
  37.               |------------Tray1
  38.               |                 |
  39.               |                 |----------Paper type
  40.               |                 |----------value
  41.               |                 |----------Amount
  42.               |                 |----------value
  43.               |
  44.               |------------Tray2
  45.                                 |
  46.                                 |----------Paper type
  47.                                 |----------value
  48.                                 |----------Amount
  49.                                 |----------value
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I have a function which creates this empty model. Every value field is empty. I need to be able to do three things:

One: When the user chooses the type of paper he wants for a specific tray on a specific printer and the amount of paper he need I need to set the corresponding value fields.

Two: I need to reset the model, clear all values.

Three: I need to retrieve all values, for storing, printing etc.

I thought about making new model every time and copying it to the model that is associated to the view but I am not sure since model inherits QObject plus it doesn't solve my need number three. I am sure there is an answer in the documentation but so far I failed to find it. If somebody could help me save some time and tell me where to look for a class or a function to use it would really help me.

All I need is a way to set and get the value of the specific item in the model.

Thanks in advance.