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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Sheet Signals</TITLE
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="SEC-SHEETSIGNALS"
>Sheet Signals</A
></H1
><P
>The interaction between user and sheet is done(as in all Gtk programs) through signals.
In GtkSheet the next signals are implemented :</P
><P
></P
><UL
COMPACT="COMPACT"
><LI
><SPAN
> <TT
CLASS="LITERAL"
>SELECT_ROW</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>SELECT_COLUMN</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>SELECT_RANGE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>CLIP_RANGE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>RESIZE_RANGE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>MOVE_RANGE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>TRAVERSE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>DEACTIVATE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>ACTIVATE</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>SET_CELL</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>CLEAR_CELL</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>CHANGED</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>NEW_COL_WIDTH</TT
></SPAN
></LI
><LI
><SPAN
> <TT
CLASS="LITERAL"
>NEW_ROW_WIDTH</TT
></SPAN
></LI
></UL
><P
>If you want to catch these signals , you must connect them to a callback(function that treats the signal/event).</P
><P
>The most used signals are :<I
CLASS="EMPHASIS"
> ACTIVATE,DEACTIVATE,TRAVERSE </I
>.</P
><P
>Callback functions for different signals have different parameters.
For a correct use you should check out the Gtk-Extra Reference Manual , the examples or GtkExtra source code.
Incorrect use of the callback function parameters will have an undefined result(in the worst case).</P
><P
>The <I
CLASS="EMPHASIS"
>ACTIVATE</I
> signal should be connected if you want to do something when a cell is clicked:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>g_signal_connect(G_OBJECT(sheet),
"activate",
alarm_activate,
NULL);
//The callback function should have these parameters:
gint alarm_activate(GtkWidget *sheet,
gint row, gint col, gpointer data)
{
................
}</PRE
></TD
></TR
></TABLE
><P
>If you have different functions that require the same cell to behave in a different way , I suggest that
instead of writing "n" alarm_activate() callbacks , write just one callback function that looks like this:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>g_signal_connect(G_OBJECT(sheet),
"activate",
alarm_activate,
(gpointer)function_name);
When the signal is connected , pass the function name (for example) as the last parameter.
gint alarm_activate(GtkWidget *sheet,
gint row, gint col, gpointer function_name)
{
if(strcmp(function_name,"table_new")==0){
.....do_some_stuf()
}
else if(strcmp(function_name,"table_edit")==0){
.....do_other_stuf()
}
}</PRE
></TD
></TR
></TABLE
><P
>In this way , you will have a much cleaner code with fewer functions as possible.
It is better to have a single callback function that treats all posible behaviour cases ,
instead of many functions which make the code harder to read.</P
><P
>A very important signal is <I
CLASS="EMPHASIS"
>TRAVERSE</I
>.</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>gtk_signal_connect(G_OBJECT(sheet),
"traverse",
alarm_traverse,
NULL);
//The callback function should have these parameters:
gint alarm_traverse(GtkWidget *widget,
gint row, gint col, gint *new_row, gint *new_col,
gpointer data)
{
...........
}</PRE
></TD
></TR
></TABLE
><P
>The "traverse" signal is emited before "deactivate_cell" and allows to veto the movement.
In such case, the entry will remain in the site, and the other signals will not be emited.</P
><P
>The traverse signal is useful when you need to know what cell have you previously clicked or what was selected. </P
><P
>The explanation for the the other signals is quite straightforward so if you want more details you should check
GtkExtra Reference Manual or the GtkExtra source code.</P
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