Create WBackground widget.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

lib/widget.h

@@ -18,6 +18,7 @@ typedef struct WGroup WGroup;
 #include "lib/widget/rect.h"
 #include "lib/widget/widget-common.h"
 #include "lib/widget/group.h"
+#include "lib/widget/background.h"
 #include "lib/widget/frame.h"
 #include "lib/widget/dialog.h"
 #include "lib/widget/history.h"

lib/widget/Makefile.am

@@ -2,6 +2,7 @@
 noinst_LTLIBRARIES = libmcwidget.la
 
 libmcwidget_la_SOURCES = \
+	background.c background.h \
 	button.c button.h \
 	buttonbar.c buttonbar.h \
 	check.c check.h \

lib/widget/background.c

@@ -0,0 +1,119 @@
+/*
+   Widgets for the Midnight Commander
+
+   Copyright (C) 2020
+   The Free Software Foundation, Inc.
+
+   Authors:
+   Andrew Borodin <aborodin@vmail.ru>, 2020
+
+   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 hline.c
+ *  \brief Source: WBackground widget (background area of dialog)
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include "lib/global.h"
+#include "lib/tty/tty.h"
+#include "lib/tty/color.h"
+#include "lib/widget.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+background_adjust (WBackground * b)
+{
+    Widget *w = WIDGET (b);
+    Widget *wo = WIDGET (w->owner);
+
+    w->y = wo->y;
+    w->x = wo->x;
+    w->lines = wo->lines;
+    w->cols = wo->cols;
+
+    w->pos_flags |= WPOS_KEEP_ALL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+background_draw (const WBackground * b)
+{
+    const Widget *w = CONST_WIDGET (b);
+
+    tty_setcolor (b->color);
+    tty_fill_region (w->y, w->x, w->lines, w->cols, b->pattern);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+cb_ret_t
+background_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
+{
+    WBackground *b = BACKGROUND (w);
+
+    switch (msg)
+    {
+    case MSG_INIT:
+        background_adjust (b);
+        return MSG_HANDLED;
+
+    case MSG_DRAW:
+        background_draw (b);
+        return MSG_HANDLED;
+
+    default:
+        return widget_default_callback (w, sender, msg, parm, data);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+WBackground *
+background_new (int y, int x, int lines, int cols, int color, unsigned char pattern,
+                widget_cb_fn callback)
+{
+    WBackground *b;
+    Widget *w;
+
+    b = g_new (WBackground, 1);
+    w = WIDGET (b);
+    widget_init (w, y, x, lines, cols, callback != NULL ? callback : background_callback, NULL);
+
+    b->color = color;
+    b->pattern = pattern;
+
+    return b;
+}
+
+/* --------------------------------------------------------------------------------------------- */

lib/widget/background.h

@@ -0,0 +1,36 @@
+
+/** \file background.h
+ *  \brief Header: WBackground widget
+ */
+
+#ifndef MC__WIDGET_BACKGROUND_H
+#define MC__WIDGET_BACKGROUND_H
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+#define BACKGROUND(x) ((WBackground *)(x))
+#define CONST_BACKGROUND(x) ((const WBackground *)(x))
+
+/*** enums ***************************************************************************************/
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+typedef struct
+{
+    Widget widget;
+
+    int color;                  /* Color to fill area */
+    unsigned char pattern;      /* Symbol to fill area */
+} WBackground;
+
+/*** global variables defined in .c file *********************************************************/
+
+/*** declarations of public functions ************************************************************/
+
+WBackground *background_new (int y, int x, int lines, int cols, int color, unsigned char pattern,
+                             widget_cb_fn callback);
+cb_ret_t background_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data);
+
+/*** inline functions ****************************************************************************/
+
+#endif /* MC__WIDGET_BACKGROUND_H */