gtk_text_buffer_place_cursor

[Armoured]

Hi
Please can I have an example of the use of this function?


Thanks

[dhouston]

I need to solve this, too - or make a virtue of necessity and always add lines at the top.

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buffer=gtk_text_view_get_buffer_(GadgetID(#EDT_IO_MAIN))
chars=gtk_text_buffer_get_char_count_(buffer)
lines=gtk_text_buffer_get_line_count_(buffer)
gtk_text_buffer_place_cursor_(buffer,buffer+chars-1)

The first 3 lines work but no matter what I try for the second argument for gtk_text_buffer_place_cursor_(), I get an Invalid Memory Access error.

[dhouston]

I found some C code at http://www.computergeekmatt.com/gtk/servercode.html which does what we want (I think) but I'm not sure I understand C syntax well enough to convert it to PureBasic. Specifically, I'm not sure what the & in &iter means nor what to use for FALSE.

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	string = gtk_entry_get_text(GTK_ENTRY(w->textBox)); //get the message to send.
	g_strdup(string);
	buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(w->textArea));//set buffer to the text in the text area
	gtk_text_buffer_get_end_iter(buffer, &iter); //Get the end of the buffer
	gtk_text_buffer_place_cursor(buffer, &iter); //set the cursor at the end of the buffer
	gtk_text_buffer_insert_at_cursor(buffer, "\nYOU said: ", -1); //write to the buffer at the cursor

Also, I'm not sure whether this scrolls the window to display the bottom line or merely sets the insertion point in the buffer.

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	gtk_text_buffer_get_end_iter(buffer, &iter);
	gtk_text_buffer_place_cursor(buffer, &iter);

	mark = gtk_text_buffer_create_mark(buffer, "cursor", &iter, FALSE); //create a mark in the buffer to scroll to

	gtk_text_view_scroll_to_mark(GTK_TEXT_VIEW(w->textArea), mark, //scroll to the mark
									0, FALSE, 0, 0);

This seems to actually scroll the window.

[dhouston]

I've tried this code and still get an Invalid Memory access at gtk_text_buffer_place_cursor. That's the only line that causes an error - if I comment it out, the code runs but the window does not scroll. I've tried with both iter and *iter with the same result.

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buffer=gtk_text_view_get_buffer_(GadgetID(#EDT_IO_MAIN));//set buffer to the text in the text area
gtk_text_buffer_get_end_iter_(buffer,*iter);
gtk_text_buffer_place_cursor_(buffer,*iter);
mark=gtk_text_buffer_create_mark_(buffer,"cursor",*iter,False);//create a mark in the buffer to scroll to
gtk_text_view_scroll_to_mark_(GadgetID(#EDT_IO_MAIN)),mark,0,False,0,0);//scroll to the mark

[walker]

first declare a var like

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mypointertoiteration.GtkTextIter

Then you have to get the position with gtk_text_buffer_get_iter_at_offset_(buffer,@pointertoiteration,position)

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gtk_text_buffer_get_iter_at_offset_(buffer,@mypointertoiteration,10)

(position can be a value from 0 up to the count of chars in your text)
and then you can apply the cursor with

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gtk_text_buffer_place_cursor_(buffer,@mypointertoiteration)       

The buffer is a pointer to the created GTKTextBuffer containing your text

[Armoured]

Ok
I need only one thing.
How I can read the current position of the cursor in the editor?

[dhouston]

@walker
Thanks for the pointer pointers.

[Armoured]

Thanks Walker!

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Procedure SetCursorPos(Id.l,pos.l)
    Protected mypointertoiteration.GtkTextIter, *buffer.l
    *buffer = gtk_text_view_get_buffer_(GadgetID(Id))
    gtk_text_buffer_get_iter_at_offset_(*buffer,@mypointertoiteration,pos)
    gtk_text_buffer_place_cursor_(*buffer,@mypointertoiteration)
EndProcedure


Procedure.l GetCursorPos(Id.l)
    Protected mypointertoiteration.GtkTextIter, *buffer.l,cursor.l
    *buffer = gtk_text_view_get_buffer_(GadgetID(Id))
    cursor = gtk_text_buffer_get_insert_(*buffer)
    gtk_text_buffer_get_iter_at_mark_(*buffer, @mypointertoiteration, cursor)
    ProcedureReturn gtk_text_iter_get_offset_(@mypointertoiteration)
EndProcedure

These are my two procedures to control the cursor in an EditorGadget()

[walker]

no problem.. and thanks for posting the 2 procedures.. so everyone can benefit from it

a question @ Fred / Freak: Why does gtk_editable_get_position_(*editable) and gtk_editable_set_position_(*editable,position) do NOT work on an EditorGadget? regarding to the GTK doc it should :roll: (do I miss anything?)

[freak]

GtkTextView does not inherit from GtkEditable, so these functions are not valid for it.

[walker]

got me... I guess i got confused by the EditorGadget and the GTKEditable and mixed this a little....