Re: Can anybody give me an example of scrolling of GtkTextView?

[Olexiy Avramchenko <ath beast stu cn ua>]

amitjain wrote:

> Example Attached!!!!
> ----- Original Message ----- 
> From: "mili" <milimeter 163 com>
> To: <gtk-list gnome org>
> Sent: Thursday, November 14, 2002 8:04 PM
> Subject: Can anybody give me an example of scrolling of GtkTextView?
>
>
> Hi, anybody
>
>  Can you give me an example of scrolling a GtkTextView to the end of all 
> texts? I want the lass line could be seen in the screen.
Use gtk_text_view_scroll_to_iter() function to do this. Example coming 
attached.

Olexiy

/*
	Shows how to launch threads and feed GtkTextView from them.
	Can be compiled with:

	gcc -O2 -Wall `pkg-config --cflags --libs gtk+-2.0 gthread-2.0` logger.c -o logger


	Olexiy Avramchenko
*/

#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>


static int threads_count=0;

/*
	Simple thread function. It generates 1000 lines of text and puts their into
	GtkTextView widget.
*/
static void logger(GtkTextView *tv)
{
int		i, tnumber=++threads_count;
char		s[256];
GtkTextBuffer	*buffer;
GtkTextIter	iter;

	if (!tv)
		return;

	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));

	for (i=0;i<1000;i++) {
		sprintf(s, "thread N%d, message N%d\n", tnumber, i);

		/* using gdk_threads* pair to protect these calls */
		gdk_threads_enter();
		gtk_text_buffer_get_end_iter(buffer, &iter);
		gtk_text_buffer_insert(buffer, &iter, s, -1);
		gdk_threads_leave();
	}
}

/*
	Callback on "Log" button "clicked" signal, just launches another thread.
*/
static void start_log(GtkWidget *button, GtkWidget *tv)
{
GThread *tid;

	tid = g_thread_create((GThreadFunc)logger, tv, TRUE, NULL);
}

/*
	Clears the content of GtkTextView,
*/
static void clear_log(GtkWidget *button, GtkWidget *tv)
{
GtkTextBuffer	*buffer;
GtkTextIter	start, end;

	if (!tv)
		return;

	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));

	gtk_text_buffer_get_bounds(buffer, &start, &end);
	gtk_text_buffer_delete(buffer, &start, &end);
}

/*
	Scrolls GtkTextView till bottom.
*/
static void scroll_log(GtkWidget *button, GtkWidget *tv)
{
GtkTextBuffer	*buffer;
GtkTextIter	end;

	if (!tv)
		return;

	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));

	gtk_text_buffer_get_end_iter(buffer, &end);
	gtk_text_view_scroll_to_iter(GTK_TEXT_VIEW(tv), &end, 0.0, FALSE, 0.0,0.0);
}


int main(int argc, char **argv)
{
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *button;
GtkWidget *tv;
GtkWidget *sw;

	/* initalizing thread stuff */
	g_thread_init(NULL);
	gdk_threads_init();

	gtk_init(&argc, &argv);

	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_set_default_size(GTK_WINDOW(window), 640, 480);
	gtk_window_set_title(GTK_WINDOW(window), "l0ggeR");
	g_signal_connect(window, "delete_event",G_CALLBACK(gtk_main_quit), NULL);

	tv = gtk_text_view_new();
	gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(tv), FALSE);

	vbox = gtk_vbox_new(FALSE, 2);
	gtk_container_add(GTK_CONTAINER(window), vbox);

	hbox = gtk_hbox_new(FALSE, 0);
	gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE,FALSE, 2);

	button = gtk_button_new_with_label("Log");
	gtk_box_pack_start(GTK_BOX(hbox), button, FALSE,FALSE, 2);
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(start_log), tv);

	button = gtk_button_new_from_stock(GTK_STOCK_CLEAR);
	gtk_box_pack_start(GTK_BOX(hbox), button, FALSE,FALSE, 2);
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(clear_log), tv);

	button = gtk_button_new_from_stock(GTK_STOCK_GOTO_BOTTOM);
	gtk_box_pack_start(GTK_BOX(hbox), button, FALSE,FALSE, 2);
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(scroll_log), tv);

	button = gtk_button_new_from_stock(GTK_STOCK_QUIT);
	gtk_box_pack_start(GTK_BOX(hbox), button, FALSE,FALSE, 2);
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(gtk_main_quit), NULL);

	sw = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(
					GTK_SCROLLED_WINDOW (sw),
					GTK_POLICY_AUTOMATIC,
					GTK_POLICY_AUTOMATIC
	);
	gtk_box_pack_start(GTK_BOX(vbox), sw, TRUE,TRUE, 0);

	gtk_container_add(GTK_CONTAINER(sw), tv);

	gtk_widget_show_all(window);

	/* guarding gtk_main with gdk_threads* pair */
	gdk_threads_enter();
	gtk_main();
	gdk_threads_leave();

	return 0;
}