forked from AuroraMiddleware/gtk
scrolledwindow: Add ::edge-overshot signal
This signal is emitted whenever user scrolling hits the overshoot edge in the given direction. May be useful to add "reload" or "load more" behaviors in apps. https://bugzilla.gnome.org/show_bug.cgi?id=738534
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@ -208,6 +208,7 @@ enum
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{
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SCROLL_CHILD,
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MOVE_FOCUS_OUT,
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EDGE_OVERSHOT,
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LAST_SIGNAL
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};
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@ -545,7 +546,33 @@ gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
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_gtk_marshal_VOID__ENUM,
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G_TYPE_NONE, 1,
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GTK_TYPE_DIRECTION_TYPE);
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/**
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* GtkScrolledWindow::edge-overshot:
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* @scrolled_window: a #GtkScrolledWindow
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* @pos: edge side that was hit
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*
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* The ::edge-overshot signal is emitted whenever user initiated scrolling
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* makes the scrolledwindow firmly surpass (ie. with some edge resistance)
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* the lower or upper limits defined by the adjustment in that orientation.
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*
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* If a similar behavior without edge resistance is desired, one alternative
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* may be to check on #GtkAdjustment::value-changed that the value equals
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* either #GtkAdjustment:lower or #GtkAdjustment:upper - #GtkAdjustment:page-size.
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*
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* Note: The @pos argument is LTR/RTL aware, so callers should be aware too
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* if intending to provide behavior on horizontal edges.
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*
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* Since: 3.16
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*/
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signals[EDGE_OVERSHOT] =
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g_signal_new (I_("edge-overshot"),
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G_TYPE_FROM_CLASS (gobject_class),
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G_SIGNAL_RUN_LAST, 0,
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NULL, NULL,
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g_cclosure_marshal_generic,
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G_TYPE_NONE, 1, GTK_TYPE_POSITION_TYPE);
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binding_set = gtk_binding_set_by_class (class);
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add_scroll_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
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@ -2525,20 +2552,46 @@ _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
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{
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GtkScrolledWindowPrivate *priv = scrolled_window->priv;
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gdouble lower, upper, *prev_value;
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GtkPositionType edge_pos;
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gboolean vertical;
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lower = gtk_adjustment_get_lower (adjustment) - MAX_OVERSHOOT_DISTANCE;
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upper = gtk_adjustment_get_upper (adjustment) -
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gtk_adjustment_get_page_size (adjustment) + MAX_OVERSHOOT_DISTANCE;
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if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
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prev_value = &priv->unclamped_hadj_value;
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vertical = FALSE;
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else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
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prev_value = &priv->unclamped_vadj_value;
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vertical = TRUE;
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else
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return;
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*prev_value = CLAMP (value, lower, upper);
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if (vertical)
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prev_value = &priv->unclamped_vadj_value;
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else
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prev_value = &priv->unclamped_hadj_value;
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value = CLAMP (value, lower, upper);
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if (*prev_value == value)
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return;
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*prev_value = value;
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gtk_adjustment_set_value (adjustment, value);
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if (value == lower)
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edge_pos = vertical ? GTK_POS_TOP : GTK_POS_LEFT;
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else if (value == upper)
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edge_pos = vertical ? GTK_POS_BOTTOM : GTK_POS_RIGHT;
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else
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return;
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/* Invert horizontal edge position on RTL */
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if (!vertical &&
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gtk_widget_get_direction (GTK_WIDGET (scrolled_window)) == GTK_TEXT_DIR_RTL)
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edge_pos = (edge_pos == GTK_POS_LEFT) ? GTK_POS_RIGHT : GTK_POS_LEFT;
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g_signal_emit (scrolled_window, signals[EDGE_OVERSHOT], 0, edge_pos);
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}
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static gboolean
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@ -133,6 +133,7 @@ noinst_PROGRAMS = $(TEST_PROGS) \
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testexpander \
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testvolumebutton \
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testscrolledwindow \
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testscrolledge \
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testswitch \
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testcellarea \
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testswitch \
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@ -270,6 +271,7 @@ testgrouping_DEPENDENCIES = $(TEST_DEPS)
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testtooltips_DEPENDENCIES = $(TEST_DEPS)
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testvolumebutton_DEPENDENCIES = $(TEST_DEPS)
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testscrolledwindow_DEPENDENCIES = $(TEST_DEPS)
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testscrolledge_DEPENDENCIES = $(TEST_DEPS)
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testcellarea_DEPENDENCIES = $(TEST_DEPS)
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testtreemenu_DEPENDENCIES = $(TEST_DEPS)
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testwindows_DEPENDENCIES = $(TEST_DEPS)
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129
tests/testscrolledge.c
Normal file
129
tests/testscrolledge.c
Normal file
@ -0,0 +1,129 @@
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/* 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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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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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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