1 files changed, 368 insertions, 0 deletions
diff --git a/lib/widget/dialog-switch.c b/lib/widget/dialog-switch.c
new file mode 100644
index 0000000..73e3f80
--- /dev/null
+++ b/lib/widget/dialog-switch.c
@@ -0,0 +1,368 @@
+/*
+   Support of multiply editors and viewers.
+
+   Original idea and code: Oleg "Olegarch" Konovalov <olegarch@linuxinside.com>
+
+   Copyright (C) 2009-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Daniel Borca <dborca@yahoo.com>, 2007
+   Andrew Borodin <aborodin@vmail.ru>, 2010-2022
+
+   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 dialog-switch.c
+ *  \brief Source: support of multiply editors and viewers.
+ */
+
+#include <config.h>
+
+#include "lib/global.h"
+#include "lib/tty/tty.h"        /* LINES, COLS */
+#include "lib/tty/color.h"      /* tty_set_normal_attrs() */
+#include "lib/widget.h"
+#include "lib/event.h"
+
+/*** global variables ****************************************************************************/
+
+WDialog *filemanager = NULL;
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* List of dialogs: filemanagers, editors, viewers */
+static GList *mc_dialogs = NULL;
+/* Currently active dialog */
+static GList *mc_current = NULL;
+/* Is there any dialogs that we have to run after returning to the manager from another dialog */
+static gboolean dialog_switch_pending = FALSE;
+
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static unsigned char
+get_hotkey (int n)
+{
+    return (n <= 9) ? '0' + n : 'a' + n - 10;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dialog_switch_suspend (void *data, void *user_data)
+{
+    (void) user_data;
+
+    if (data != mc_current->data)
+        widget_set_state (WIDGET (data), WST_SUSPENDED, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dialog_switch_goto (GList * dlg)
+{
+    if (mc_current != dlg)
+    {
+        WDialog *old = DIALOG (mc_current->data);
+
+        mc_current = dlg;
+
+        if (old == filemanager)
+        {
+            /* switch from panels to another dialog (editor, viewer, etc) */
+            dialog_switch_pending = TRUE;
+            dialog_switch_process_pending ();
+        }
+        else
+        {
+            /* switch from editor, viewer, etc to another dialog */
+            widget_set_state (WIDGET (old), WST_SUSPENDED, TRUE);
+
+            if (DIALOG (dlg->data) != filemanager)
+                /* switch to another editor, viewer, etc */
+                /* return to panels before run the required dialog */
+                dialog_switch_pending = TRUE;
+            else
+            {
+                /* switch to panels */
+                widget_set_state (WIDGET (filemanager), WST_ACTIVE, TRUE);
+                do_refresh ();
+            }
+        }
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dialog_switch_resize (WDialog * d)
+{
+    if (widget_get_state (WIDGET (d), WST_ACTIVE))
+        send_message (d, NULL, MSG_RESIZE, 0, NULL);
+    else
+        GROUP (d)->winch_pending = TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_add (WDialog * h)
+{
+    GList *dlg;
+
+    dlg = g_list_find (mc_dialogs, h);
+
+    if (dlg != NULL)
+        mc_current = dlg;
+    else
+    {
+        mc_dialogs = g_list_prepend (mc_dialogs, h);
+        mc_current = mc_dialogs;
+    }
+
+    /* suspend forced all other screens */
+    g_list_foreach (mc_dialogs, dialog_switch_suspend, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_remove (WDialog * h)
+{
+    GList *this;
+
+    if (DIALOG (mc_current->data) == h)
+        this = mc_current;
+    else
+        this = g_list_find (mc_dialogs, h);
+
+    mc_dialogs = g_list_delete_link (mc_dialogs, this);
+
+    /* adjust current dialog */
+    if (top_dlg != NULL)
+        mc_current = g_list_find (mc_dialogs, DIALOG (top_dlg->data));
+    else
+        mc_current = mc_dialogs;
+
+    /* resume forced the current screen */
+    if (mc_current != NULL)
+        widget_set_state (WIDGET (mc_current->data), WST_ACTIVE, TRUE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+size_t
+dialog_switch_num (void)
+{
+    return g_list_length (mc_dialogs);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_next (void)
+{
+    GList *next;
+
+    if (mc_global.midnight_shutdown || mc_current == NULL)
+        return;
+
+    next = g_list_next (mc_current);
+    if (next == NULL)
+        next = mc_dialogs;
+
+    dialog_switch_goto (next);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_prev (void)
+{
+    GList *prev;
+
+    if (mc_global.midnight_shutdown || mc_current == NULL)
+        return;
+
+    prev = g_list_previous (mc_current);
+    if (prev == NULL)
+        prev = g_list_last (mc_dialogs);
+
+    dialog_switch_goto (prev);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_list (void)
+{
+    const size_t dlg_num = g_list_length (mc_dialogs);
+    int lines, cols;
+    Listbox *listbox;
+    GList *h, *selected;
+    int i = 0;
+
+    if (mc_global.midnight_shutdown || mc_current == NULL)
+        return;
+
+    lines = MIN ((size_t) (LINES * 2 / 3), dlg_num);
+    cols = COLS * 2 / 3;
+
+    listbox = create_listbox_window (lines, cols, _("Screens"), "[Screen selector]");
+
+    for (h = mc_dialogs; h != NULL; h = g_list_next (h))
+    {
+        WDialog *dlg = DIALOG (h->data);
+        char *title;
+
+        if (dlg->get_title != NULL)
+            title = dlg->get_title (dlg, WIDGET (listbox->list)->rect.cols - 2);
+        else
+            title = g_strdup ("");
+
+        listbox_add_item (listbox->list, LISTBOX_APPEND_BEFORE, get_hotkey (i++), title, h, FALSE);
+
+        g_free (title);
+    }
+
+    selected = run_listbox_with_data (listbox, mc_current);
+    if (selected != NULL)
+        dialog_switch_goto (selected);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+dialog_switch_process_pending (void)
+{
+    int ret = 0;
+
+    while (dialog_switch_pending)
+    {
+        WDialog *h = DIALOG (mc_current->data);
+        Widget *wh = WIDGET (h);
+
+        dialog_switch_pending = FALSE;
+        widget_set_state (wh, WST_SUSPENDED, TRUE);
+        ret = dlg_run (h);
+        if (widget_get_state (wh, WST_CLOSED))
+        {
+            widget_destroy (wh);
+
+            /* return to panels */
+            if (mc_global.mc_run_mode == MC_RUN_FULL)
+            {
+                mc_current = g_list_find (mc_dialogs, filemanager);
+                mc_event_raise (MCEVENT_GROUP_FILEMANAGER, "update_panels", NULL);
+            }
+        }
+    }
+
+    repaint_screen ();
+
+    return ret;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_got_winch (void)
+{
+    GList *dlg;
+
+    for (dlg = mc_dialogs; dlg != NULL; dlg = g_list_next (dlg))
+        if (dlg != mc_current)
+            GROUP (dlg->data)->winch_pending = TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_switch_shutdown (void)
+{
+    while (mc_dialogs != NULL)
+    {
+        WDialog *dlg = DIALOG (mc_dialogs->data);
+
+        dlg_run (dlg);
+        widget_destroy (WIDGET (dlg));
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+repaint_screen (void)
+{
+    do_refresh ();
+    tty_refresh ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+mc_refresh (void)
+{
+#ifdef ENABLE_BACKGROUND
+    if (mc_global.we_are_background)
+        return;
+#endif /* ENABLE_BACKGROUND */
+
+    if (!tty_got_winch ())
+        tty_refresh ();
+    else
+    {
+        /* if winch was caugth, we should do not only redraw screen, but
+           reposition/resize all */
+        dialog_change_screen_size ();
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dialog_change_screen_size (void)
+{
+    GList *d;
+
+    tty_flush_winch ();
+    tty_change_screen_size ();
+
+#ifdef HAVE_SLANG
+    tty_keypad (TRUE);
+    tty_nodelay (FALSE);
+#endif
+
+    /* Inform all suspending dialogs */
+    dialog_switch_got_winch ();
+
+    /* Inform all running dialogs from first to last */
+    for (d = g_list_last (top_dlg); d != NULL; d = g_list_previous (d))
+        dialog_switch_resize (DIALOG (d->data));
+
+    /* Now, force the redraw */
+    repaint_screen ();
+}
+
+/* --------------------------------------------------------------------------------------------- */