Add the skeletal code for the new viewport widget.

The code is used to experiment with a different approach of the
implementation of a listbox.

po/wesnoth-lib/POTFILES.in

@@ -164,5 +164,6 @@ src/widgets/scrollbar.cpp
 src/widgets/scrollpane.cpp
 src/widgets/slider.cpp
 src/widgets/textbox.cpp
+src/widgets/viewport.cpp
 src/widgets/widget.cpp
 src/wml_exception.cpp

src/CMakeLists.txt

@@ -550,6 +550,7 @@ set(wesnoth-main_SRC
 	gui/widgets/tree_view.cpp
 	gui/widgets/tree_view_node.cpp
 	gui/widgets/vertical_scrollbar.cpp
+	gui/widgets/viewport.cpp
 	gui/widgets/widget.cpp
 	gui/widgets/window.cpp
 	halo.cpp

src/SConscript

@@ -127,6 +127,7 @@ libwesnoth_sources = Split("""
     widgets/scrollbar.cpp
     widgets/slider.cpp
     widgets/textbox.cpp
+    widgets/viewport.cpp
     widgets/widget.cpp
     wml_exception.cpp
     """)

src/gui/auxiliary/window_builder/listbox.cpp

@@ -22,12 +22,14 @@
 #include "gui/auxiliary/log.hpp"
 #include "gui/auxiliary/widget_definition/listbox.hpp"
 #include "gui/auxiliary/window_builder/helper.hpp"
+#include "gui/widgets/grid.hpp"
 #ifdef GUI2_EXPERIMENTAL_LISTBOX
 #include "gui/widgets/list.hpp"
 #else
 #include "gui/widgets/listbox.hpp"
 #endif
 #include "gui/widgets/pane.hpp"
+#include "gui/widgets/viewport.hpp"
 #include "gui/widgets/settings.hpp"
 #include "wml_exception.hpp"
 
@@ -100,9 +102,31 @@ twidget* tbuilder_listbox::build() const
 	return widget;
 #else
 	if(new_widgets) {
-		tpane *widget = new tpane(list_builder);
-		widget->set_id(id);
-		return widget;
+
+		tpane *pane = new tpane(list_builder);
+		pane->set_id(id);
+
+		tviewport *viewport = new tviewport();
+
+		tgrid* grid = new tgrid();
+		grid->set_rows_cols(1, 2);
+		grid->set_child(
+				  pane
+				, 0
+				, 0
+				, tgrid::VERTICAL_GROW_SEND_TO_CLIENT
+					| tgrid::HORIZONTAL_GROW_SEND_TO_CLIENT
+				, tgrid::BORDER_ALL);
+
+		grid->set_child(
+				  viewport
+				, 0
+				, 1
+				, tgrid::VERTICAL_GROW_SEND_TO_CLIENT
+					| tgrid::HORIZONTAL_GROW_SEND_TO_CLIENT
+				, tgrid::BORDER_ALL);
+
+		return grid;
 	}
 
 	tlistbox *widget = new tlistbox(

src/gui/widgets/viewport.cpp

@@ -0,0 +1,53 @@
+/* $Id$ */
+/*
+   Copyright (C) 2012 by Mark de Wever <koraq@xs4all.nl>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#define GETTEXT_DOMAIN "wesnoth-lib"
+
+#include "gui/widgets/viewport.hpp"
+
+#include "gui/auxiliary/log.hpp"
+
+#define LOG_SCOPE_HEADER "tviewport [" + id() + "] " + __func__
+#define LOG_HEADER LOG_SCOPE_HEADER + ':'
+
+namespace gui2 {
+
+tviewport::tviewport()
+{
+}
+
+void tviewport::request_reduce_width(const unsigned /*maximum_width*/)
+{
+}
+
+tpoint tviewport::calculate_best_size() const
+{
+	return tpoint(500, 500);
+}
+
+bool tviewport::disable_click_dismiss() const
+{
+	return false;
+}
+
+iterator::twalker_* tviewport::create_walker()
+{
+	/**
+	 * @todo Implement properly.
+	 */
+	return NULL;
+}
+
+} // namespace gui2

src/gui/widgets/viewport.hpp

@@ -0,0 +1,52 @@
+/* $Id$ */
+/*
+   Copyright (C) 2012 by Mark de Wever <koraq@xs4all.nl>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#ifndef GUI_WIDGETS_VIEWPORT_HPP_INCLUDED
+#define GUI_WIDGETS_VIEWPORT_HPP_INCLUDED
+
+#include "gui/widgets/widget.hpp"
+
+namespace gui2 {
+
+class tgrid;
+
+class tviewport
+	: public twidget
+{
+public:
+
+	tviewport();
+
+	/** Inherited from twidget. */
+	void request_reduce_width(const unsigned maximum_width);
+
+private:
+	/** Inherited from twidget. */
+	tpoint calculate_best_size() const;
+
+public:
+	/** Inherited from twidget. */
+	bool disable_click_dismiss() const;
+
+	/** Inherited from twidget. */
+	virtual iterator::twalker_* create_walker();
+
+private:
+
+};
+
+} // namespace gui2
+
+#endif