Adding upstream version 3:4.8.29.upstream/3%4.8.29upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 968 insertions, 0 deletions

diff --git a/lib/widget/group.c b/lib/widget/group.c
new file mode 100644
index 0000000..9ff52d9
--- /dev/null
+++ b/lib/widget/group.c
@@ -0,0 +1,968 @@
+/*
+   Widget group features module for the Midnight Commander
+
+   Copyright (C) 2020-2022
+   The Free Software Foundation, Inc.
+
+   Written by:
+   Andrew Borodin <aborodin@vmail.ru>, 2020-2022
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander 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.
+
+   The Midnight Commander 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/>.
+ */
+
+/** \file group.c
+ *  \brief Source: widget group features module
+ */
+
+#include <config.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lib/global.h"
+
+#include "lib/tty/key.h"        /* ALT() */
+
+#include "lib/widget.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/* Control widget positions in a group */
+typedef struct
+{
+    int shift_x;
+    int scale_x;
+    int shift_y;
+    int scale_y;
+} widget_shift_scale_t;
+
+typedef struct
+{
+    widget_state_t state;
+    gboolean enable;
+} widget_state_info_t;
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_widget_init (void *data, void *user_data)
+{
+    (void) user_data;
+
+    send_message (WIDGET (data), NULL, MSG_INIT, 0, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static GList *
+group_get_next_or_prev_of (GList * list, gboolean next)
+{
+    GList *l = NULL;
+
+    if (list != NULL)
+    {
+        WGroup *owner = WIDGET (list->data)->owner;
+
+        if (owner != NULL)
+        {
+            if (next)
+            {
+                l = g_list_next (list);
+                if (l == NULL)
+                    l = owner->widgets;
+            }
+            else
+            {
+                l = g_list_previous (list);
+                if (l == NULL)
+                    l = g_list_last (owner->widgets);
+            }
+        }
+    }
+
+    return l;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_select_next_or_prev (WGroup * g, gboolean next)
+{
+    if (g->widgets != NULL && g->current != NULL)
+    {
+        GList *l = g->current;
+
+        do
+        {
+            l = group_get_next_or_prev_of (l, next);
+        }
+        while (!widget_is_focusable (l->data) && l != g->current);
+
+        widget_select (l->data);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_widget_set_state (gpointer data, gpointer user_data)
+{
+    widget_state_info_t *state = (widget_state_info_t *) user_data;
+
+    widget_set_state (WIDGET (data), state->state, state->enable);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Send broadcast message to all widgets in the group that have specified options.
+ *
+ * @param g WGroup object
+ * @param msg message sent to widgets
+ * @param reverse if TRUE, send message in reverse order, FALSE -- in direct one.
+ * @param options if WOP_DEFAULT, the message is sent to all widgets. Else message is sent to widgets
+ *                that have specified options.
+ */
+
+static void
+group_send_broadcast_msg_custom (WGroup * g, widget_msg_t msg, gboolean reverse,
+                                 widget_options_t options)
+{
+    GList *p, *first;
+
+    if (g->widgets == NULL)
+        return;
+
+    if (g->current == NULL)
+        g->current = g->widgets;
+
+    p = group_get_next_or_prev_of (g->current, !reverse);
+    first = p;
+
+    do
+    {
+        Widget *w = WIDGET (p->data);
+
+        p = group_get_next_or_prev_of (p, !reverse);
+
+        if (options == WOP_DEFAULT || (options & w->options) != 0)
+            /* special case: don't draw invisible widgets */
+            if (msg != MSG_DRAW || widget_get_state (w, WST_VISIBLE))
+                send_message (w, NULL, msg, 0, NULL);
+    }
+    while (first != p);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+  * Default group callback to convert group coordinates from local (relative to owner) to global
+  * (relative to screen).
+  *
+  * @param w widget
+  */
+
+static void
+group_default_make_global (Widget * w, const WRect * delta)
+{
+    GList *iter;
+
+    if (delta != NULL)
+    {
+        /* change own coordinates */
+        widget_default_make_global (w, delta);
+        /* change child widget coordinates */
+        for (iter = GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+            WIDGET (iter->data)->make_global (WIDGET (iter->data), delta);
+    }
+    else if (w->owner != NULL)
+    {
+        WRect r = WIDGET (w->owner)->rect;
+
+        r.lines = 0;
+        r.cols = 0;
+        /* change own coordinates */
+        widget_default_make_global (w, &r);
+        /* change child widget coordinates */
+        for (iter = GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+            WIDGET (iter->data)->make_global (WIDGET (iter->data), &r);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+  * Default group callback to convert group coordinates from global (relative to screen) to local
+  * (relative to owner).
+  *
+  * @param w widget
+  */
+
+static void
+group_default_make_local (Widget * w, const WRect * delta)
+{
+    GList *iter;
+
+    if (delta != NULL)
+    {
+        /* change own coordinates */
+        widget_default_make_local (w, delta);
+        /* change child widget coordinates */
+        for (iter = GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+            WIDGET (iter->data)->make_local (WIDGET (iter->data), delta);
+    }
+    else if (w->owner != NULL)
+    {
+        WRect r = WIDGET (w->owner)->rect;
+
+        r.lines = 0;
+        r.cols = 0;
+        /* change own coordinates */
+        widget_default_make_local (w, &r);
+        /* change child widget coordinates */
+        for (iter = GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+            WIDGET (iter->data)->make_local (WIDGET (iter->data), &r);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Default group callback function to find widget in the group.
+ *
+ * @param w WGroup object
+ * @param what widget to find
+ *
+ * @return holder of @what if found, NULL otherwise
+ */
+
+static GList *
+group_default_find (const Widget * w, const Widget * what)
+{
+    GList *w0;
+
+    w0 = widget_default_find (w, what);
+    if (w0 == NULL)
+    {
+        GList *iter;
+
+        for (iter = CONST_GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+        {
+            w0 = widget_find (WIDGET (iter->data), what);
+            if (w0 != NULL)
+                break;
+        }
+    }
+
+    return w0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Default group callback function to find widget in the group using widget callback.
+ *
+ * @param w WGroup object
+ * @param cb widget callback
+ *
+ * @return widget object if found, NULL otherwise
+ */
+
+static Widget *
+group_default_find_by_type (const Widget * w, widget_cb_fn cb)
+{
+    Widget *w0;
+
+    w0 = widget_default_find_by_type (w, cb);
+    if (w0 == NULL)
+    {
+        GList *iter;
+
+        for (iter = CONST_GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+        {
+            w0 = widget_find_by_type (WIDGET (iter->data), cb);
+            if (w0 != NULL)
+                break;
+        }
+    }
+
+    return w0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Default group callback function to find widget by widget ID in the group.
+ *
+ * @param w WGroup object
+ * @param id widget ID
+ *
+ * @return widget object if widget with specified id is found in group, NULL otherwise
+ */
+
+static Widget *
+group_default_find_by_id (const Widget * w, unsigned long id)
+{
+    Widget *w0;
+
+    w0 = widget_default_find_by_id (w, id);
+    if (w0 == NULL)
+    {
+        GList *iter;
+
+        for (iter = CONST_GROUP (w)->widgets; iter != NULL; iter = g_list_next (iter))
+        {
+            w0 = widget_find_by_id (WIDGET (iter->data), id);
+            if (w0 != NULL)
+                break;
+        }
+    }
+
+    return w0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Update cursor position in the active widget of the group.
+ *
+ * @param g WGroup object
+ *
+ * @return MSG_HANDLED if cursor was updated in the specified group, MSG_NOT_HANDLED otherwise
+ */
+
+static cb_ret_t
+group_update_cursor (WGroup * g)
+{
+    GList *p = g->current;
+
+    if (p != NULL && widget_get_state (WIDGET (g), WST_ACTIVE))
+        do
+        {
+            Widget *w = WIDGET (p->data);
+
+            /* Don't use widget_is_selectable() here.
+               If WOP_SELECTABLE option is not set, widget can handle mouse events.
+               For example, commandl line in file manager */
+            if (widget_get_options (w, WOP_WANT_CURSOR) && widget_get_state (w, WST_VISIBLE)
+                && !widget_get_state (w, WST_DISABLED) && widget_update_cursor (WIDGET (p->data)))
+                return MSG_HANDLED;
+
+            p = group_get_widget_next_of (p);
+        }
+        while (p != g->current);
+
+    return MSG_NOT_HANDLED;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_widget_set_position (gpointer data, gpointer user_data)
+{
+    /* there are, mainly, 2 generally possible situations:
+     * 1. control sticks to one side - it should be moved
+     * 2. control sticks to two sides of one direction - it should be sized
+     */
+
+    Widget *c = WIDGET (data);
+    const WRect *g = &CONST_WIDGET (c->owner)->rect;
+    const widget_shift_scale_t *wss = (const widget_shift_scale_t *) user_data;
+    WRect r = c->rect;
+
+    if ((c->pos_flags & WPOS_CENTER_HORZ) != 0)
+        r.x = g->x + (g->cols - c->rect.cols) / 2;
+    else if ((c->pos_flags & WPOS_KEEP_LEFT) != 0 && (c->pos_flags & WPOS_KEEP_RIGHT) != 0)
+    {
+        r.x += wss->shift_x;
+        r.cols += wss->scale_x;
+    }
+    else if ((c->pos_flags & WPOS_KEEP_LEFT) != 0)
+        r.x += wss->shift_x;
+    else if ((c->pos_flags & WPOS_KEEP_RIGHT) != 0)
+        r.x += wss->shift_x + wss->scale_x;
+
+    if ((c->pos_flags & WPOS_CENTER_VERT) != 0)
+        r.y = g->y + (g->lines - c->rect.lines) / 2;
+    else if ((c->pos_flags & WPOS_KEEP_TOP) != 0 && (c->pos_flags & WPOS_KEEP_BOTTOM) != 0)
+    {
+        r.y += wss->shift_y;
+        r.lines += wss->scale_y;
+    }
+    else if ((c->pos_flags & WPOS_KEEP_TOP) != 0)
+        r.y += wss->shift_y;
+    else if ((c->pos_flags & WPOS_KEEP_BOTTOM) != 0)
+        r.y += wss->shift_y + wss->scale_y;
+
+    send_message (c, NULL, MSG_RESIZE, 0, &r);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_set_position (WGroup * g, const WRect * r)
+{
+    WRect *w = &WIDGET (g)->rect;
+    widget_shift_scale_t wss;
+    /* save old positions, will be used to reposition childs */
+    WRect or = *w;
+
+    *w = *r;
+
+    /* dialog is empty */
+    if (g->widgets == NULL)
+        return;
+
+    if (g->current == NULL)
+        g->current = g->widgets;
+
+    /* values by which controls should be moved */
+    wss.shift_x = w->x - or.x;
+    wss.scale_x = w->cols - or.cols;
+    wss.shift_y = w->y - or.y;
+    wss.scale_y = w->lines - or.lines;
+
+    if (wss.shift_x != 0 || wss.shift_y != 0 || wss.scale_x != 0 || wss.scale_y != 0)
+        g_list_foreach (g->widgets, group_widget_set_position, &wss);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_default_resize (WGroup * g, WRect * r)
+{
+    /* This is default resizing mechanism.
+     * The main idea of this code is to resize dialog according to flags
+     * (if any of flags require automatic resizing, like WPOS_CENTER,
+     * end after that reposition controls in dialog according to flags of widget)
+     */
+
+    Widget *w = WIDGET (g);
+    WRect r0;
+
+    r0 = r != NULL ? *r : w->rect;
+    widget_adjust_position (w->pos_flags, &r0);
+    group_set_position (g, &r0);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+group_draw (WGroup * g)
+{
+    Widget *wg = WIDGET (g);
+
+    /* draw all widgets in Z-order, from first to last */
+    if (widget_get_state (wg, WST_ACTIVE))
+    {
+        GList *p;
+
+        if (g->winch_pending)
+        {
+            g->winch_pending = FALSE;
+            send_message (wg, NULL, MSG_RESIZE, 0, NULL);
+        }
+
+        for (p = g->widgets; p != NULL; p = g_list_next (p))
+            widget_draw (WIDGET (p->data));
+
+        widget_update_cursor (wg);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+group_handle_key (WGroup * g, int key)
+{
+    cb_ret_t handled;
+
+    /* first try the hotkey */
+    handled = send_message (g, NULL, MSG_HOTKEY, key, NULL);
+
+    /* not used - then try widget_callback */
+    if (handled == MSG_NOT_HANDLED)
+        handled = send_message (g->current->data, NULL, MSG_KEY, key, NULL);
+
+    /* not used - try to use the unhandled case */
+    if (handled == MSG_NOT_HANDLED)
+        handled = send_message (g, g->current->data, MSG_UNHANDLED_KEY, key, NULL);
+
+    return handled;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+group_handle_hotkey (WGroup * g, int key)
+{
+    GList *current;
+    Widget *w;
+    cb_ret_t handled = MSG_NOT_HANDLED;
+    int c;
+
+    if (g->widgets == NULL)
+        return MSG_NOT_HANDLED;
+
+    if (g->current == NULL)
+        g->current = g->widgets;
+
+    w = WIDGET (g->current->data);
+
+    if (!widget_get_state (w, WST_VISIBLE) || widget_get_state (w, WST_DISABLED))
+        return MSG_NOT_HANDLED;
+
+    /* Explanation: we don't send letter hotkeys to other widgets
+     * if the currently selected widget is an input line */
+    if (widget_get_options (w, WOP_IS_INPUT))
+    {
+        /* skip ascii control characters, anything else can valid character in some encoding */
+        if (key >= 32 && key < 256)
+            return MSG_NOT_HANDLED;
+    }
+
+    /* If it's an alt key, send the message */
+    c = key & ~ALT (0);
+    if (key & ALT (0) && g_ascii_isalpha (c))
+        key = g_ascii_tolower (c);
+
+    if (widget_get_options (w, WOP_WANT_HOTKEY))
+        handled = send_message (w, NULL, MSG_HOTKEY, key, NULL);
+
+    /* If not used, send hotkey to other widgets */
+    if (handled == MSG_HANDLED)
+        return MSG_HANDLED;
+
+    current = group_get_widget_next_of (g->current);
+
+    /* send it to all widgets */
+    while (g->current != current && handled == MSG_NOT_HANDLED)
+    {
+        w = WIDGET (current->data);
+
+        if (widget_get_options (w, WOP_WANT_HOTKEY) && !widget_get_state (w, WST_DISABLED))
+            handled = send_message (w, NULL, MSG_HOTKEY, key, NULL);
+
+        if (handled == MSG_NOT_HANDLED)
+            current = group_get_widget_next_of (current);
+    }
+
+    if (handled == MSG_HANDLED)
+    {
+        w = WIDGET (current->data);
+        widget_select (w);
+        send_message (g, w, MSG_HOTKEY_HANDLED, 0, NULL);
+    }
+
+    return handled;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Initialize group.
+ *
+ * @param g WGroup widget
+ * @param y1 y-coordinate of top-left corner
+ * @param x1 x-coordinate of top-left corner
+ * @param lines group height
+ * @param cols group width
+ * @param callback group callback
+ * @param mouse_callback group mouse handler
+ */
+
+void
+group_init (WGroup * g, const WRect * r, widget_cb_fn callback, widget_mouse_cb_fn mouse_callback)
+{
+    Widget *w = WIDGET (g);
+
+    widget_init (w, r, callback != NULL ? callback : group_default_callback, mouse_callback);
+
+    w->mouse_handler = group_handle_mouse_event;
+
+    w->make_global = group_default_make_global;
+    w->make_local = group_default_make_local;
+
+    w->find = group_default_find;
+    w->find_by_type = group_default_find_by_type;
+    w->find_by_id = group_default_find_by_id;
+
+    w->set_state = group_default_set_state;
+
+    g->mouse_status = MOU_UNHANDLED;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+cb_ret_t
+group_default_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
+{
+    WGroup *g = GROUP (w);
+
+    switch (msg)
+    {
+    case MSG_INIT:
+        g_list_foreach (g->widgets, group_widget_init, NULL);
+        return MSG_HANDLED;
+
+    case MSG_DRAW:
+        group_draw (g);
+        return MSG_HANDLED;
+
+    case MSG_KEY:
+        return group_handle_key (g, parm);
+
+    case MSG_HOTKEY:
+        return group_handle_hotkey (g, parm);
+
+    case MSG_CURSOR:
+        return group_update_cursor (g);
+
+    case MSG_RESIZE:
+        group_default_resize (g, RECT (data));
+        return MSG_HANDLED;
+
+    case MSG_DESTROY:
+        g_list_foreach (g->widgets, (GFunc) widget_destroy, NULL);
+        g_list_free (g->widgets);
+        g->widgets = NULL;
+        return MSG_HANDLED;
+
+    default:
+        return widget_default_callback (w, sender, msg, parm, data);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Change state of group.
+ *
+ * @param w      group
+ * @param state  widget state flag to modify
+ * @param enable specifies whether to turn the flag on (TRUE) or off (FALSE).
+ *               Only one flag per call can be modified.
+ * @return       MSG_HANDLED if set was handled successfully, MSG_NOT_HANDLED otherwise.
+ */
+cb_ret_t
+group_default_set_state (Widget * w, widget_state_t state, gboolean enable)
+{
+    gboolean ret = MSG_HANDLED;
+    WGroup *g = GROUP (w);
+    widget_state_info_t st = {
+        .state = state,
+        .enable = enable
+    };
+
+    ret = widget_default_set_state (w, state, enable);
+
+    if (state == WST_ACTIVE || state == WST_SUSPENDED || state == WST_CLOSED)
+        /* inform all child widgets */
+        g_list_foreach (g->widgets, group_widget_set_state, &st);
+
+    if ((w->state & WST_ACTIVE) != 0)
+    {
+        if ((w->state & WST_FOCUSED) != 0)
+        {
+            /* update current widget */
+            if (g->current != NULL)
+                widget_set_state (WIDGET (g->current->data), WST_FOCUSED, enable);
+        }
+        else
+            /* inform all child widgets */
+            g_list_foreach (g->widgets, group_widget_set_state, &st);
+    }
+
+    return ret;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Handling mouse events.
+ *
+ * @param g WGroup object
+ * @param event GPM mouse event
+ *
+ * @return result of mouse event handling
+ */
+int
+group_handle_mouse_event (Widget * w, Gpm_Event * event)
+{
+    WGroup *g = GROUP (w);
+
+    if (g->widgets != NULL)
+    {
+        GList *p;
+
+        /* send the event to widgets in reverse Z-order */
+        p = g_list_last (g->widgets);
+        do
+        {
+            Widget *wp = WIDGET (p->data);
+
+            /* Don't use widget_is_selectable() here.
+               If WOP_SELECTABLE option is not set, widget can handle mouse events.
+               For example, commandl line in file manager */
+            if (widget_get_state (w, WST_VISIBLE) && !widget_get_state (wp, WST_DISABLED))
+            {
+                /* put global cursor position to the widget */
+                int ret;
+
+                ret = wp->mouse_handler (wp, event);
+                if (ret != MOU_UNHANDLED)
+                    return ret;
+            }
+
+            p = g_list_previous (p);
+        }
+        while (p != NULL);
+    }
+
+    return MOU_UNHANDLED;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Insert widget to group before specified widget with specified positioning.
+ * Make the inserted widget current.
+ *
+ * @param g WGroup object
+ * @param w widget to be added
+ * @pos positioning flags
+ * @param before add @w before this widget
+ *
+ * @return widget ID
+ */
+
+unsigned long
+group_add_widget_autopos (WGroup * g, void *w, widget_pos_flags_t pos_flags, const void *before)
+{
+    Widget *wg = WIDGET (g);
+    Widget *ww = WIDGET (w);
+    GList *new_current;
+
+    /* Don't accept NULL widget. This shouldn't happen */
+    assert (ww != NULL);
+
+    if ((pos_flags & WPOS_CENTER_HORZ) != 0)
+        ww->rect.x = (wg->rect.cols - ww->rect.cols) / 2;
+
+    if ((pos_flags & WPOS_CENTER_VERT) != 0)
+        ww->rect.y = (wg->rect.lines - ww->rect.lines) / 2;
+
+    ww->owner = g;
+    ww->pos_flags = pos_flags;
+    widget_make_global (ww);
+
+    if (g->widgets == NULL || before == NULL)
+    {
+        g->widgets = g_list_append (g->widgets, ww);
+        new_current = g_list_last (g->widgets);
+    }
+    else
+    {
+        GList *b;
+
+        b = g_list_find (g->widgets, before);
+
+        /* don't accept widget not from group. This shouldn't happen */
+        assert (b != NULL);
+
+        b = g_list_next (b);
+        g->widgets = g_list_insert_before (g->widgets, b, ww);
+        if (b != NULL)
+            new_current = g_list_previous (b);
+        else
+            new_current = g_list_last (g->widgets);
+    }
+
+    /* widget has been added at runtime */
+    if (widget_get_state (wg, WST_ACTIVE))
+    {
+        group_widget_init (ww, NULL);
+        widget_select (ww);
+    }
+    else
+        g->current = new_current;
+
+    return ww->id;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Remove widget from group.
+ *
+ * @param w Widget object
+ */
+void
+group_remove_widget (void *w)
+{
+    Widget *ww = WIDGET (w);
+    WGroup *g;
+    GList *d;
+
+    /* Don't accept NULL widget. This shouldn't happen */
+    assert (w != NULL);
+
+    g = ww->owner;
+
+    d = g_list_find (g->widgets, ww);
+    if (d == g->current)
+        group_set_current_widget_next (g);
+
+    g->widgets = g_list_delete_link (g->widgets, d);
+    if (g->widgets == NULL)
+        g->current = NULL;
+
+    /* widget has been deleted at runtime */
+    if (widget_get_state (WIDGET (g), WST_ACTIVE))
+    {
+        group_draw (g);
+        group_select_current_widget (g);
+    }
+
+    widget_make_local (ww);
+    ww->owner = NULL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Switch current widget to widget after current in group.
+ *
+ * @param g WGroup object
+ */
+
+void
+group_set_current_widget_next (WGroup * g)
+{
+    g->current = group_get_next_or_prev_of (g->current, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Switch current widget to widget before current in group.
+ *
+ * @param g WGroup object
+ */
+
+void
+group_set_current_widget_prev (WGroup * g)
+{
+    g->current = group_get_next_or_prev_of (g->current, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Get widget that is after specified widget in group.
+ *
+ * @param w widget holder
+ *
+ * @return widget that is after "w" or NULL if "w" is NULL or widget doesn't have owner
+ */
+
+GList *
+group_get_widget_next_of (GList * w)
+{
+    return group_get_next_or_prev_of (w, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Get widget that is before specified widget in group.
+ *
+ * @param w widget holder
+ *
+ * @return widget that is before "w" or NULL if "w" is NULL or widget doesn't have owner
+ */
+
+GList *
+group_get_widget_prev_of (GList * w)
+{
+    return group_get_next_or_prev_of (w, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Try to select next widget in the Z order.
+ *
+ * @param g WGroup object
+ */
+
+void
+group_select_next_widget (WGroup * g)
+{
+    group_select_next_or_prev (g, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Try to select previous widget in the Z order.
+ *
+ * @param g WGroup object
+ */
+
+void
+group_select_prev_widget (WGroup * g)
+{
+    group_select_next_or_prev (g, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Find the widget with the specified ID in the group and select it
+ *
+ * @param g WGroup object
+ * @param id widget ID
+ */
+
+void
+group_select_widget_by_id (const WGroup * g, unsigned long id)
+{
+    Widget *w;
+
+    w = widget_find_by_id (CONST_WIDGET (g), id);
+    if (w != NULL)
+        widget_select (w);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Send broadcast message to all widgets in the group.
+ *
+ * @param g WGroup object
+ * @param msg message sent to widgets
+ */
+
+void
+group_send_broadcast_msg (WGroup * g, widget_msg_t msg)
+{
+    group_send_broadcast_msg_custom (g, msg, FALSE, WOP_DEFAULT);
+}
+
+/* --------------------------------------------------------------------------------------------- */