Implement the tips panel in the new titlescreen.

data/gui/default/window/title_screen.cfg

@@ -49,6 +49,108 @@
 [/window_definition]
 
 #define _GUI_TIP_SECTION
+	[panel]
+		definition = "title_screen"
+
+		[grid]
+
+			[row]
+
+				[column]
+					border = "all"
+					border_size = 5
+					horizontal_grow = "true"
+
+					[label]
+						id = "tip"
+						definition = "default"
+
+						wrap = "true"
+					[/label]
+
+				[/column]
+
+			[/row]
+
+			[row]
+
+				[column]
+					border = "all"
+					border_size = 5
+					horizontal_alignment = "right"
+
+					[label]
+						id = "source"
+						definition = "default"
+					[/label]
+
+				[/column]
+
+			[/row]
+
+			[row]
+
+				[column]
+					horizontal_grow = "true" 
+
+					[grid]
+
+						[row]
+
+							[column]
+								border = "all"
+								border_size = 5
+								horizontal_alignment = "left"
+
+								[button]
+									id = "help"
+									definition = "default"
+
+									label = _ "Help"
+								[/button]
+
+							[/column]
+
+							[column]
+								border = "all"
+								border_size = 5
+								grow_factor = 1
+								horizontal_alignment = "right"
+
+								[button]
+									id = "previous_tip"
+									definition = "default"
+
+									label = _ "Previous"
+								[/button]
+
+							[/column]
+
+							[column]
+								border = "all"
+								border_size = 5
+								horizontal_alignment = "right"
+
+								[button]
+									id = "next_tip"
+									definition = "default"
+
+									label = _ "Next"
+								[/button]
+
+							[/column]
+
+						[/row]
+
+					[/grid]
+
+				[/column]
+
+			[/row]
+
+		[/grid]
+
+	[/panel]
 #enddef
 
 
@@ -109,6 +211,11 @@
 
 			[row]
 
+				[column]
+					vertical_alignment = "bottom"
+					{_GUI_TIP_SECTION}	
+				[/column]
+
 				[column]
 					horizontal_alignment = "right"
 					{_GUI_MENU_SECTION}

src/gui/dialogs/title_screen.cpp

@@ -22,7 +22,9 @@
 #include "gui/dialogs/addon_connect.hpp"
 #include "gui/dialogs/language_selection.hpp"
 #include "gui/widgets/button.hpp"
+#include "gui/widgets/label.hpp"
 #include "gui/widgets/window.hpp"
+#include "titlescreen.hpp"
 
 static lg::log_domain log_config("config");
 #define ERR_CF LOG_STREAM(err, log_config)
@@ -52,6 +54,13 @@ void show_dialog(twidget* caller)
  * This shows the title screen.
  */
 
+ttitle_screen::ttitle_screen()
+	: video_(NULL)
+	, tips_()
+{
+	read_tips_of_day(tips_);
+}
+
 twindow* ttitle_screen::build_window(CVideo& video)
 {
 	return build(video, get_id(TITLE_SCREEN));
@@ -69,13 +78,22 @@ void ttitle_screen::pre_show(CVideo& video, twindow& window)
 
 	/**** Set the buttons ****/
 	window.get_widget<tbutton>("addons", false).
-		set_callback_mouse_left_click(show_dialog<gui2::taddon_connect>);
+			set_callback_mouse_left_click(show_dialog<gui2::taddon_connect>);
 
 	// Note changing the language doesn't upate the title screen...
 	window.get_widget<tbutton>("language", false).
 			set_callback_mouse_left_click(
 				show_dialog<gui2::tlanguage_selection>);
 
+	/**** Set the tip of the day ****/
+	update_tip(window, true);
+
+	window.get_widget<tbutton>("next_tip", false).
+			set_callback_mouse_left_click(next_tip);
+
+	window.get_widget<tbutton>("previous_tip", false).
+			set_callback_mouse_left_click(previous_tip);
+
 	/***** Select a random game_title *****/
 	std::vector<std::string> game_title_list =
 		utils::split(game_config::game_title
@@ -95,4 +113,42 @@ void ttitle_screen::post_show(twindow& /*window*/)
 	video_ = NULL;
 }
 
+void ttitle_screen::update_tip(twindow& window, const bool previous)
+{
+	next_tip_of_day(tips_, previous);
+	const config *tip = get_tip_of_day(tips_);
+	assert(tip);
+
+	window.get_widget<tlabel>("tip", false).set_label((*tip)["text"]);
+	window.get_widget<tlabel>("source", false).set_label((*tip)["source"]);
+
+	/**
+	 * @todo Convert the code to use a multi_page so the invalidate is not
+	 * needed.
+	 */
+	window.invalidate_layout();
+}
+
+void ttitle_screen::next_tip(twidget* caller)
+{
+	ttitle_screen *dialog = dynamic_cast<ttitle_screen*>(caller->dialog());
+	assert(dialog);
+
+	twindow *window = caller->get_window();
+	assert(window);
+
+	dialog->update_tip(*window, true);
+}
+
+void ttitle_screen::previous_tip(twidget* caller)
+{
+	ttitle_screen *dialog = dynamic_cast<ttitle_screen*>(caller->dialog());
+	assert(dialog);
+
+	twindow *window = caller->get_window();
+	assert(window);
+
+	dialog->update_tip(*window, false);
+}
+
 } // namespace gui2

src/gui/dialogs/title_screen.hpp

@@ -17,15 +17,14 @@
 
 #include "gui/dialogs/dialog.hpp"
 
+#include "config.hpp"
+
 namespace gui2 {
 
 class ttitle_screen : public tdialog
 {
 public:
-	ttitle_screen() :
-		video_(NULL)
-	{
-	}
+	ttitle_screen();
 
 	CVideo* video() { return video_; }
 
@@ -41,6 +40,23 @@ private:
 
 	/** Inherited from tdialog. */
 	void post_show(twindow& window);
+
+	/** Hold the tips of the day. */
+	config tips_;
+
+	/** 
+	 * Updates the tip of day widget.
+	 *
+	 * @param previous            Show the previous tip, else shows the next
+	 *                            one.
+	 */
+	void update_tip(twindow& window, const bool previous);
+
+	/** Helper to forward the call to update_tip. */
+	static void next_tip(twidget* caller);
+
+	/** Helper to forward the call to update_tip. */
+	static void previous_tip(twidget* caller);
 };
 
 } // namespace gui2

src/gui/widgets/window.cpp

@@ -336,6 +336,8 @@ twindow::tretval twindow::get_retval_by_id(const std::string& id)
 	 * engine can't handle all dialogs yet, so it needs to fall back to the old
 	 * engine to make certain things happen.
 	 */
+	} else if(id == "help") {
+		return static_cast<tretval>(gui::SHOW_HELP);
 	} else if(id == "campaign") {
 		return static_cast<tretval>(gui::NEW_CAMPAIGN);
 	} else if(id == "multiplayer") {