For example, change the top X-Axis name of a graph, we can use the following code.

// Make the top x-axis the active one
SetCtrlAttribute (panel, PANEL_GRAPH, ATTR_ACTIVE_XAXIS, VAL_TOP_XAXIS);    
// Set the name
SetCtrlAttribute (panel, PANEL_GRAPH, ATTR_XNAME, "Axis Changed");

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If the controls have similar functions, it’s a better idea to make them use the same callback function. It save a lot of time and make the program short and simple. Every control on the UI(User Interface) has a unique reference ID, we could build an array of reference IDs to store the ID information of every control on UI. And, in the callback function, the parameter “control” can be used to identify which control is functioning. And a loop in the callback function can be used to find out the right execution code and run it.

Code can be like this:

[sourcecode language='c']
int iControlIDs[n]; //The definition of the ID array
…….
CallbackFunction(……) //The callback function
{
for(i=0; i {
if(control == iControlIDs[i])
{
…… //The execution code of the control
}
}
}
[/sourcecode]

It will make the code short and simple. And will save a lot time from writing callback function code to each control separately.

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