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/* testscrolledge.c
*
* Copyright (C) 2014 Matthias Clasen <mclasen@redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <gtk/gtk.h>
static guint add_rows_id = 0;
static void
populate_list (GtkListBox *list)
{
int i;
char *text;
GtkWidget *row, *label;
int n;
GtkWidget *child;
for (child = gtk_widget_get_first_child (GTK_WIDGET (list)), n = 0;
child != NULL;
child = gtk_widget_get_next_sibling (child), n++) ;
for (i = 1; i <= 50; i++)
{
row = gtk_list_box_row_new ();
text = g_strdup_printf ("List row %d", i + n);
label = gtk_label_new (text);
g_free (text);
gtk_widget_set_margin_start (label, 10);
gtk_widget_set_margin_end (label, 10);
gtk_widget_set_margin_top (label, 10);
gtk_widget_set_margin_bottom (label, 10);
gtk_widget_set_halign (label, GTK_ALIGN_START);
gtk_list_box_row_set_child (GTK_LIST_BOX_ROW (row), label);
gtk_list_box_insert (GTK_LIST_BOX (list), row, -1);
}
}
static GtkWidget *popup;
static GtkWidget *spinner;
static gboolean
add_rows (gpointer data)
{
GtkListBox *list = data;
gtk_widget_hide (popup);
gtk_spinner_stop (GTK_SPINNER (spinner));
populate_list (list);
add_rows_id = 0;
return G_SOURCE_REMOVE;
}
static void
edge_overshot (GtkScrolledWindow *sw,
GtkPositionType pos,
GtkListBox *list)
{
if (pos == GTK_POS_BOTTOM)
{
gtk_spinner_start (GTK_SPINNER (spinner));
gtk_widget_show (popup);
if (add_rows_id == 0)
add_rows_id = g_timeout_add (2000, add_rows, list);
}
}
static void
edge_reached (GtkScrolledWindow *sw,
GtkPositionType pos,
GtkListBox *list)
{
g_print ("Reached the edge at pos %d!\n", pos);
}
int
main (int argc, char *argv[])
{
GtkWidget *win;
GtkWidget *sw;
GtkWidget *list;
GtkWidget *overlay;
GtkWidget *label;
gtk_init ();
win = gtk_window_new ();
gtk_window_set_default_size (GTK_WINDOW (win), 600, 400);
overlay = gtk_overlay_new ();
popup = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_widget_set_halign (popup, GTK_ALIGN_CENTER);
gtk_widget_set_valign (popup, GTK_ALIGN_END);
gtk_widget_set_margin_start (popup, 40);
gtk_widget_set_margin_end (popup, 40);
gtk_widget_set_margin_top (popup, 40);
gtk_widget_set_margin_bottom (popup, 40);
label = gtk_label_new ("Getting more rows...");
spinner = gtk_spinner_new ();
gtk_box_append (GTK_BOX (popup), label);
gtk_box_append (GTK_BOX (popup), spinner);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), popup);
gtk_widget_hide (popup);
sw = gtk_scrolled_window_new ();
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
list = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list), GTK_SELECTION_NONE);
gtk_window_set_child (GTK_WINDOW (win), overlay);
gtk_overlay_set_child (GTK_OVERLAY (overlay), sw);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), list);
populate_list (GTK_LIST_BOX (list));
g_signal_connect (sw, "edge-overshot", G_CALLBACK (edge_overshot), list);
g_signal_connect (sw, "edge-reached", G_CALLBACK (edge_reached), list);
gtk_widget_show (win);
while (TRUE)
g_main_context_iteration (NULL, TRUE);
return 0;
}
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