I have a tree control with check marks and the option "Text Click Toggles Mark". When I have a list of items I need to disable (i.e. make dimmed) some of them, but I can't find the attribute ATTR_DIMMED for the function SetTreeItemAttribute(). I used SetTreeCellAttribute() but in this way the check marks remains active, so I can toggle it also for disabled items. How can I completely disable (i.e. dim) a tree item? With its check mark too?

This should do the trick. int CVICALLBACK TreeCB (int panel, int control, int event, void *callbackData, int eventData1, int eventData2) { int itemIdx, dimmed, swallow=0; switch (event) { case EVENT_MARK_STATE_CHANGE: itemIdx = eventData2; GetTreeCellAttribute(panel, control, itemIdx, 0, ATTR_CELL_DIMMED, &dimmed); if (dimmed) swallow = 1; break; } return swallow; }

LabWindows/CVI

How to dim a tree item?

Solved!

Do you know a trick to do the same using CVI 2010 ?

I know that my checkbox won't be dimmed, but I want to keep the active state. Example :

+ root

| + item 1

| + item 2 (dimmed)

| + item 3

All my checkboxes are unchecked except the item 2. If I try to uncheck the item 2 in this configuration : no worries. If I check the item 3, then I can uncheck as I want the item 2....

Here is my code sample :

int CVICALLBACK tree_interact(int panel, int control, int event, void *callbackData,
   int eventData1, int eventData2)
{
   int testIndex = 0;
   int testStatusDimmed = 0;

   switch (event)
   {
       case EVENT_MARK_STATE_CHANGE:
       {
           GetCtrlIndex (panel, control, &testIndex);
           GetTreeItemAttribute(PANEL, PANEL_TREE, testIndex, ATTR_CELL_DIMMED, &testStatusDimmed);

           if(checks[testIndex].dimmed != 0)
           {
               SetTreeItemAttribute(PANEL, PANEL_TREE, testIndex, ATTR_MARK_STATE, checks[testIndex].checked);
           }
           break;
       }
   }
   return 0;
}