Added resize callback, made main callback optional

include/terml.h

@@ -6,9 +6,15 @@ extern "C"
 {
 #endif
 
-typedef void (*terml_main_callback)();
-typedef int  (*terml_quit_callback)();
-typedef void (*terml_key_callback) (char code);
+typedef void (*terml_main_callback)  ();
+typedef int  (*terml_quit_callback)  ();
+typedef void (*terml_key_callback)   (char code);
+typedef void (*terml_resize_callback)(
+	unsigned int previous_width,
+	unsigned int previous_height,
+	unsigned int new_width,
+	unsigned int new_height
+);
 
 int terml_init();
 int terml_deinit();
@@ -23,6 +29,7 @@ void terml_flush();
 void terml_set_main_callback(terml_main_callback);
 void terml_set_quit_callback(terml_quit_callback);
 void terml_set_key_callback(terml_key_callback);
+void terml_set_resize_callback(terml_resize_callback);
 
 void terml_start();
 void terml_stop();

source/terml.cpp

@@ -13,6 +13,7 @@ terml::terml() :
 	main(nullptr),
 	quit(nullptr),
 	key(nullptr),
+	resize(nullptr),
 	buffer(nullptr),
 	width(0),
 	height(0)
@@ -136,7 +137,12 @@ void terml::set_key_callback(terml_key_callback callback)
 	key = callback;
 }
 
-void terml::key_event(char code)
+void terml::set_resize_callback(terml_resize_callback callback)
+{
+	resize = callback;
+}
+
+void terml::key_event(char code) const
 {
 	if (key)
 	{
@@ -158,7 +164,10 @@ void terml::mainloop()
 
 		while (current_time >= last_time + wait_time)
 		{
-			main();
+			if (main)
+			{
+				main();
+			}
 
 			process_events();
 
@@ -215,6 +224,9 @@ void terml::setup_buffer()
 
 	if (width != new_width || height != new_height)
 	{
+		const unsigned int old_width = width;
+		const unsigned int old_height = height;
+
 		width = new_width;
 		height = new_height;
 
@@ -229,6 +241,11 @@ void terml::setup_buffer()
 		}
 
 		buffer[CELL_SIZE * width * height] = '\0';
+
+		if (resize)
+		{
+			resize(old_width, old_height, new_width, new_height);
+		}
 	}
 }
 
@@ -321,6 +338,11 @@ extern "C"
 		TERML_G->set_key_callback(callback);
 	}
 
+	void terml_set_resize_callback(terml_resize_callback callback)
+	{
+		TERML_G->set_resize_callback(callback);
+	}
+
 	void terml_start()
 	{
 		try

source/terml_private.h

@@ -44,6 +44,7 @@ public:
 	void set_main_callback(terml_main_callback);
 	void set_quit_callback(terml_quit_callback);
 	void set_key_callback(terml_key_callback);
+	void set_resize_callback(terml_resize_callback);
 
 	void mainloop();
 	void stop();
@@ -62,7 +63,7 @@ protected:
 	virtual unsigned long long timer_frequency() = 0;
 	virtual void process_events() = 0;
 
-	void key_event(char code);
+	void key_event(char code) const;
 
 private:
 	char* buffer;
@@ -71,6 +72,7 @@ private:
 	terml_main_callback main;
 	terml_quit_callback quit;
 	terml_key_callback key;
+	terml_resize_callback resize;
 	bool should_quit;
 	bool really_should_quit;