editor: show "Map Saved" and "Scenario Saved" messages as floating label

gui2 messages grab mouse focus (modal dialog), so the user needs to click on it first before doing anything else

src/editor/editor_display.cpp

@@ -20,6 +20,7 @@
 #include "editor/editor_display.hpp"
 #include "floating_label.hpp"
 #include "font/sdl_ttf_compat.hpp" // for pango_line_width
+#include "formula/string_utils.hpp"
 #include "lexical_cast.hpp"
 #include "overlay.hpp"
 #include "team.hpp"
@@ -111,7 +112,7 @@ void editor_display::layout()
 	display::layout();
 
 	config element;
-	config::attribute_value &text = element.add_child("element")["text"];
+	config::attribute_value& text = element.add_child("element")["text"];
 	// Fill in the terrain report
 	if (get_map().on_board_with_border(mouseoverHex_)) {
 		text = get_map().get_terrain_editor_string(mouseoverHex_);
@@ -157,6 +158,33 @@ display::overlay_map& editor_display::get_overlays()
 	return controller_.get_current_map_context().get_overlays();
 }
 
+void editor_display::set_status(const std::string& str, const bool is_success)
+{
+	const color_t color{0, 0, 0, 0xbb};
+	int size = font::SIZE_SMALL;
+	point canvas_size = video::game_canvas_size();
+	const int border = 3;
+
+	std::string formatted_str;
+	if (is_success) {
+		formatted_str = VGETTEXT("<span color='#66ff00'><span face='DejaVuSans'>✔</span> $msg</span>", {{"msg", str}});
+	} else {
+		formatted_str = VGETTEXT("<span color='red'><span face='DejaVuSans'>✘</span> $msg</span>", {{"msg", str}});
+	}
+
+	font::floating_label flabel(formatted_str);
+	flabel.set_font_size(size);
+	flabel.set_position(0, canvas_size.y);
+	flabel.set_bg_color(color);
+	flabel.set_border_size(border);
+	flabel.set_lifetime(1000, 10);
+	flabel.use_markup(true);
+
+	const int f_handle = font::add_floating_label(flabel);
+	const auto& r = font::get_floating_label_rect(f_handle);
+	font::move_floating_label(f_handle, r.w, -r.h);
+}
+
 void editor_display::set_help_string_enabled(bool value)
 {
 	help_string_enabled_ = value;

src/editor/editor_display.hpp

@@ -61,6 +61,16 @@ public:
 		mouseover_hex_overlay_.reset();
 	}
 
+	/**
+	 * Set a status text at the bottom left of the map area
+	 *
+	 * @param str                 The text to display.
+	 * @param is_success          Type of message.
+	 * When true, message is shown in green with checkmark.
+	 * When false, message is shown in red with cross mark
+	 */
+	void set_status(const std::string& str, const bool is_success);
+
 	/**
 	 * Sets and shows the tooltip-like text at the top or bottom of the map area.
 	 *

src/editor/map/context_manager.cpp

@@ -887,10 +887,10 @@ bool context_manager::write_scenario(bool display_confirmation)
 	try {
 		get_map_context().save_scenario();
 		if(display_confirmation) {
-			gui2::show_transient_message("", _("Scenario saved."));
+			gui_.set_status(_("Scenario saved."), true);
 		}
 	} catch (const editor_map_save_exception& e) {
-		gui2::show_transient_message("", e.what());
+		gui_.set_status(e.what(), false);
 		return false;
 	}
 
@@ -902,10 +902,10 @@ bool context_manager::write_map(bool display_confirmation)
 	try {
 		get_map_context().save_map();
 		if(display_confirmation) {
-			gui2::show_transient_message("", _("Map saved."));
+			gui_.set_status(_("Map saved"), true);
 		}
 	} catch (const editor_map_save_exception& e) {
-		gui2::show_transient_message("", e.what());
+		gui_.set_status(e.what(), false);
 		return false;
 	}
 

src/floating_label.cpp

@@ -122,7 +122,7 @@ bool floating_label::create_texture()
 		return false;
 	}
 
-	DBG_FT << "creating floating label texture";
+	DBG_FT << "creating floating label texture, text: " << text_.substr(0,15);
 	font::pango_text& text = font::get_text_renderer();
 
 	text.set_link_aware(false)