Add GameScriptDisplayString.h and .cpp.

TR5Main/Scripting/GameScriptDisplayString.cpp

@@ -0,0 +1,61 @@
+#include "framework.h"
+#include "GameScriptDisplayString.h"
+
+UserDisplayString::UserDisplayString(std::string const& key, int x, int y, D3DCOLOR col, int flags) :
+	m_key{ key },
+	m_x{ x },
+	m_y{ y },
+	m_color{ col },
+	m_flags{ flags }
+{
+}
+
+GameScriptDisplayString::GameScriptDisplayString() {
+	// We don't ever dereference this pointer; it's just
+	// a handy way to get a most-likely-unique key
+	// for a hash map.
+	m_id = reinterpret_cast<DisplayStringIDType>(this);
+}
+
+std::unique_ptr<GameScriptDisplayString> GameScriptDisplayString::Create(std::string const & key, int x, int y, GameScriptColor col, int flags)
+{
+	auto ptr = std::make_unique<GameScriptDisplayString>();
+	auto id = ptr->m_id;
+	UserDisplayString ds{ key, x, y, col, flags };
+
+	s_addItemCallback(id, ds);
+	return ptr;
+}
+
+GameScriptDisplayString::~GameScriptDisplayString()
+{
+	s_removeItemCallback(m_id);
+}
+
+void GameScriptDisplayString::Register(sol::state* state)
+{
+	state->new_usertype<GameScriptDisplayString>(
+		"DisplayString",
+		"new", sol::factories(&GameScriptDisplayString::Create)
+		);
+}
+
+DisplayStringIDType GameScriptDisplayString::GetID() const
+{
+	return m_id;
+}
+
+AddItemCallback GameScriptDisplayString::s_addItemCallback = [](DisplayStringIDType, UserDisplayString)
+{
+	std::string err = "\"Add string\" callback is not set.";
+	throw TENScriptException(err);
+};
+
+// This is called by a destructor (or will be if we forget to assign it during a refactor)
+// and destructors "must never throw", so we terminate instead.
+RemoveItemCallback GameScriptDisplayString::s_removeItemCallback = [](DisplayStringIDType)
+{
+	TENLog("\"Remove string\" callback is not set.", LogLevel::Error);
+	std::terminate();
+};
+