ttext_box: added support for defining a maximum input length

data/gui/schema.cfg

@@ -1801,6 +1801,11 @@
                                         type="string"
                                         default=""
                                     [/key]
+                                    [key]
+                                        name="max_input_length"
+                                        type="int"
+                                        default=0
+                                    [/key]
                                     [key]
                                         name="label"
                                         type="t_string"

src/gui/auxiliary/window_builder/text_box.cpp

@@ -27,7 +27,9 @@ namespace implementation
 {
 
 tbuilder_text_box::tbuilder_text_box(const config& cfg)
-	: tbuilder_control(cfg), history(cfg["history"])
+	: tbuilder_control(cfg)
+	, history(cfg["history"])
+	, max_input_length(cfg["max_input_length"])
 {
 }
 
@@ -44,6 +46,8 @@ twidget* tbuilder_text_box::build() const
 		widget->set_history(history);
 	}
 
+	widget->set_max_input_length(max_input_length);
+
 	DBG_GUI_G << "Window builder: placed text box '" << id
 			  << "' with definition '" << definition << "'.\n";
 

src/gui/auxiliary/window_builder/text_box.hpp

@@ -33,6 +33,8 @@ public:
 	twidget* build() const;
 
 	std::string history;
+
+	size_t max_input_length;
 };
 
 

src/gui/widgets/text_box.cpp

@@ -99,6 +99,7 @@ std::string ttext_history::get_value() const
 ttext_box::ttext_box()
 	: ttext_()
 	, history_()
+	, max_input_length_(0)
 	, text_x_offset_(0)
 	, text_y_offset_(0)
 	, text_height_(0)
@@ -124,6 +125,10 @@ void ttext_box::place(const tpoint& origin, const tpoint& size)
 	set_maximum_width(get_text_maximum_width());
 	set_maximum_height(get_text_maximum_height(), false);
 
+	if(max_input_length_ != 0) {
+		set_maximum_length(max_input_length_);
+	}
+
 	update_offsets();
 }
 
@@ -135,6 +140,9 @@ void ttext_box::update_canvas()
 	const unsigned start = get_selection_start();
 	const int length = get_selection_length();
 
+	if(max_input_length_ != 0) {
+		set_maximum_length(max_input_length_);
+	}
 
 	PangoEllipsizeMode ellipse_mode = PANGO_ELLIPSIZE_NONE;
 	if(!can_wrap()) {

src/gui/widgets/text_box.hpp

@@ -131,6 +131,11 @@ public:
 		history_ = ttext_history::get_history(id, true);
 	}
 
+	void set_max_input_length(const size_t length)
+	{
+		max_input_length_ = length;
+	}
+
 	void clear()
 	{
 		set_value("");
@@ -171,6 +176,9 @@ private:
 	/** The history text for this widget. */
 	ttext_history history_;
 
+	/** The maximum length of the text input. */
+	size_t max_input_length_;
+
 	/**
 	 * The x offset in the widget where the text starts.
 	 *