Rif.: Is it possible to change the type of a Tree cell

[Zergios26]

Hello,

I'm using LABWINDOW CVI 2015, 

Starting from the xmlTree example, I have figured out that it is possible to set a cell in string:

SetTreeCellAttribute (panel, tree, ItemIndex, 0, ATTR_CELL_TYPE, VAL_CELL_RING);

In an other hand, the example event.prj show that the tree can be used with button, ring and combo_box (UI comming already formatted).

But my tests to put the cell programatically in an other type failed:

SetTreeCellAttribute (panel, tree, ItemIndex, 0, ATTR_CELL_TYPE, VAL_CELL_BUTTON); SetTreeCellAttribute (panel, tree, ItemIndex, 0, ATTR_CELL_TYPE, VAL_CELL_CHECK_BOX);

SetTreeCellAttribute (panel, tree, ItemIndex, 0, ATTR_CELL_TYPE, VAL_CELL_RING);
SetTreeCellAttribute (panel, tree, ItemIndex, 0, ATTR_CELL_TYPE, VAL_CELL_COMBO_BOX);

If someone has any idea?

Best regards,

Serge

[RobertoBozzolo · Accepted solution]

That's because you cannot modify the cell type of column 0,and you should receive an error like attribute value not valid doing so: check the return value from the function. It is always a good habit to test for errors when a function does not what we expect it to do.

Even passing VAL_ALL_OBJECTS to operate on all cells in a row the first column remains unchanged.

[Zergios26]

Thanks a lot, I was stucked on that.

Best regards,

Serge

[Zergios26]

Hi again,

I was able to change the type of the tree cell following your instructions. But now I cant see how to change the value of a CHECK_BOX by program, how can I access the control inside the cell?

Any help would be great.

Best regards,

Serge

[RobertoBozzolo · Accepted solution]

Simply use Get/SetTreeCellAttribue with attribute ATTR_MARK_STATE.

[Zergios26]

Thank you very much