IUP, mouse events on matrix - iup

Question

I have basic confusion in understanding of IUP events system.
Now I am talking about matrix.
This is how it is created:
Ihandle *create_mat(void)
{
mat = IupMatrix(NULL);
IupSetAttribute(mat, "READONLY", "YES");
IupSetCallback(mat, "CLICK_CB", (Icallback)click);
IupSetCallback(mat, "BUTTON_CB", (Icallback)button);
return mat;
}
Here are callbacks:
int click(Ihandle *mat, int lin, int col)
{
char* value = IupMatGetAttribute(mat, "", lin, col);
if (!value) value = "NULL";
printf("click_cb(%d, %d)\n", lin, col);
return IUP_DEFAULT;
}
int button(Ihandle *mat, int button, int pressed, int x, int y, char* status)
{
printf("button %d, %d, %d, %d %s\n", button, pressed, x, y, status);
return IUP_DEFAULT;
}
Problem is in that I need both callbacks active but in showed situation CLICK event isn't fired.
If I disable BUTTON_CB then CLICK event is fired. But I need both, for click, left button doubleclick, right button release etc...
Is this normal behavior that BUTTON_CB excludes CLICK_CB or I do something wrong?
Actually, how would I get "lin" and "col" from inside BUTTON_CB or WHEEL_CB handler of matrix if CLICK_CB, ENTERITEM_CB and LEAVEITEM_CB which gives lin and col is not available (not fired in described situation)?
And more, how would I get "active control" (name, type of control with focus) from event handlers used on form's level?

Answer 1

Is this normal behavior that BUTTON_CB excludes CLICK_CB or I do something wrong?
Yes, it is. Because the BUTTON_CB is a IupCanvas callback and CLICK_CB is a IupMatrix callback. Remeber that IupMatrix inherits from IupCanvas. So internally IupMatrix is using the BUTTON_CB callback to implement several features.
So in this case what you have to do is to save the previous callback before assigning a new one, and call the old one from inside your own. Something like this:
old_callback = IupGetCallback(mat, "BUTTON_CB");
IupSetCallback(mat, "BUTTON_CB", new_callback);
int new_callback(...)
{
return old_callback(...)
}
Actually, how would I get "lin" and "col" from inside BUTTON_CB or WHEEL_CB handler of matrix if CLICK_CB, ENTERITEM_CB and LEAVEITEM_CB which gives lin and col is not available (not fired in described situation)?
Use the function pos = IupConvertXYToPos(mat, x, y) where pos=lin*numcol + col. To compute lin and col is quite simple considering they are integer values.
And more, how would I get "active control" (name, type of control with focus) from event handlers used on form's level?
I don't fully undestood your question. But I think that IupGetFocus and IupGetClassName could be the functions you want.

Answer 2

I will answer to my own question by using Antonio's advices so other people interesting for IUP can have benefit from those posts.
If I understand well, what is not likely, here is how I make BUTTON_CB handler for my matrix:
int button(Ihandle *mat, int button, int pressed, int x, int y, char* status)
{
//actually 'name' is Ihandle
//and class name is a 'type'
//in compare with other toolkits
char* name = IupGetClassName(mat);
//so since we have handle already
//we can't be here if we are not in concrete matrix
//and this comparision is not needed
if (strncmp(name, "matrix", sizeof(name)) == 0)
{
//if left mouse button is down
if (button == IUP_BUTTON1 && pressed == 1)
{
//my calculation is not 100% correct
//but good enough for this sample
int pos = IupConvertXYToPos(mat, x, y);
_line = pos/numcol;
_col = pos%numcol;
//if is doubleclick
if (status[5] == 'D')
{
//press ENTER key
//and open another modal dialog
//with argument 'sel'
k_any(mat, K_CR);
printf("Doubleclick\n");
//say HANDLED for IUP
//but not matter when READONLY is "YES"
return IUP_IGNORE;
}
//calculate (public) sel
//for select a clicked line
sel = _line + from - 1;
refreshl(from, sel);
printf("Click\n");
return IUP_IGNORE;
}
}
return IUP_DEFAULT;
}
This work's as expected.
Please further suggestion if something is not OK.