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404e2753c4
This will be used to just detect when an edge of the scrollable area is reached - as opposed to the edge-overshot signal that is emitted when the user scrolls past the edge. https://bugzilla.gnome.org/show_bug.cgi?id=742848
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* testscrolledge.c
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*
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* Copyright (C) 2014 Matthias Clasen <mclasen@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gtk/gtk.h>
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static guint add_rows_id = 0;
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static void
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populate_list (GtkListBox *list)
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{
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gint i;
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gchar *text;
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GtkWidget *row, *label;
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gint n;
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GList *l;
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l = gtk_container_get_children (GTK_CONTAINER (list));
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n = g_list_length (l);
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g_list_free (l);
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for (i = 1; i <= 50; i++)
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{
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row = gtk_list_box_row_new ();
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text = g_strdup_printf ("List row %d", i + n);
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label = gtk_label_new (text);
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g_free (text);
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g_object_set (label, "margin", 10, NULL);
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gtk_widget_set_halign (label, GTK_ALIGN_START);
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gtk_container_add (GTK_CONTAINER (row), label);
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gtk_widget_show_all (row);
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gtk_container_add (GTK_CONTAINER (list), row);
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}
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}
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static GtkWidget *popup;
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static GtkWidget *spinner;
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static gboolean
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add_rows (gpointer data)
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{
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GtkListBox *list = data;
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gtk_widget_hide (popup);
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gtk_spinner_stop (GTK_SPINNER (spinner));
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populate_list (list);
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add_rows_id = 0;
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return G_SOURCE_REMOVE;
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}
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static void
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edge_overshot (GtkScrolledWindow *sw,
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GtkPositionType pos,
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GtkListBox *list)
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{
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if (pos == GTK_POS_BOTTOM)
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{
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gtk_spinner_start (GTK_SPINNER (spinner));
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gtk_widget_show (popup);
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if (add_rows_id == 0)
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add_rows_id = g_timeout_add (2000, add_rows, list);
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}
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}
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static void
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edge_reached (GtkScrolledWindow *sw,
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GtkPositionType pos,
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GtkListBox *list)
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{
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g_print ("Reached the edge at pos %d!\n", pos);
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *win;
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GtkWidget *sw;
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GtkWidget *list;
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GtkWidget *overlay;
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GtkWidget *label;
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gtk_init (NULL, NULL);
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win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_default_size (GTK_WINDOW (win), 600, 400);
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overlay = gtk_overlay_new ();
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popup = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
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gtk_widget_set_halign (popup, GTK_ALIGN_CENTER);
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gtk_widget_set_valign (popup, GTK_ALIGN_END);
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g_object_set (popup, "margin", 40, NULL);
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label = gtk_label_new ("Getting more rows...");
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spinner = gtk_spinner_new ();
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gtk_widget_show (spinner);
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gtk_widget_show (label);
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gtk_container_add (GTK_CONTAINER (popup), label);
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gtk_container_add (GTK_CONTAINER (popup), spinner);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), popup);
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gtk_widget_set_no_show_all (popup, TRUE);
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sw = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
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list = gtk_list_box_new ();
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gtk_list_box_set_selection_mode (GTK_LIST_BOX (list), GTK_SELECTION_NONE);
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gtk_container_add (GTK_CONTAINER (win), overlay);
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gtk_container_add (GTK_CONTAINER (overlay), sw);
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gtk_container_add (GTK_CONTAINER (sw), list);
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populate_list (GTK_LIST_BOX (list));
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g_signal_connect (sw, "edge-overshot", G_CALLBACK (edge_overshot), list);
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g_signal_connect (sw, "edge-reached", G_CALLBACK (edge_reached), list);
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gtk_widget_show_all (win);
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gtk_main ();
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return 0;
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}
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