Thanks. Here's how I interpreted your idea. But unfortunately it still doesn't work.
//======================================================================
// scroll-test.c - Test scrolling
//
// compile with: gcc -o scroll-test scroll-test.c `pkg-config --cflags --libs gtk+-2.0`
//----------------------------------------------------------------------
#include <gtk/gtk.h>
GtkTextBuffer *buf;
GtkWidget *tv, *sw;
double preserve_pos;GtkAdjustment *vadj;
void on_insert_text(GtkTextBuffer *textbuffer,
GtkTextIter *location, gchar *text,
gint len, gpointer user_data)
{ // Reinstall the vadj position gtk_adjustment_set_value(vadj, preserve_pos);
}/**
* This function should insert text into tv but preserve the
* display of the first line in the buffer.
*
*/
void insert_text()
{
int i;
// Remember the current position of vadj and reinstall it in // on_insert_text
preserve_pos = gtk_adjustment_get_value(vadj); GString *s = g_string_new("");
for (i=0; i<5000; i++)
g_string_append_printf(s, "Line %d\n", i);
GtkTextBuffer *buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));
gtk_text_buffer_set_text(buf, s->str,-1);
g_string_free(s,TRUE);
}
void on_clicked(GtkWidget *button,
gpointer *userdata)
{
insert_text();
}
int main(int argc, char*argv[])
{
gtk_init(&argc,&argv);
GtkWidget *top = gtk_window_new(GTK_WINDOW_TOPLEVEL);
GtkWidget *box = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(top), box);
sw = gtk_scrolled_window_new(NULL,NULL);
vadj = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(sw));
gtk_box_pack_start(GTK_BOX(box),sw,TRUE,TRUE,0);
tv = gtk_text_view_new();
buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));
gtk_container_add(GTK_CONTAINER(sw), tv);
gtk_widget_set_size_request(sw, 400, 300);
GtkWidget *btn = gtk_button_new_with_label("Insert text");
gtk_box_pack_start(GTK_BOX(box),btn,TRUE,TRUE,0);
g_signal_connect(btn, "clicked", G_CALLBACK(on_clicked), NULL);
g_signal_connect_after(buf, "insert-text",
G_CALLBACK(on_insert_text), NULL); gtk_widget_show_all(top);
insert_text();
gtk_main();
}
On Fri, Jan 15, 2010 at 11:43, Tadej Borovšak
<tadeboro gmail com> wrote:
Hello.
Actual text insertion happens in default handler for
GtkTextBuffer::insert-text signal. You may be able to set adjustment
value from signal handler, connected to insert-text after the default
handler (at the moment your function will be called, sizes should be
already updated).
Tadej
--
Tadej Borovšak
tadeboro.blogspot.com
tadeboro gmail com
tadej borovsak gmail com
