Add support of pressed_texture of image_button

Fix params number

Add pressed texture name

Fix string def

Fix syntax error

doc/lua_api.txt

@@ -933,16 +933,24 @@ button[<X>,<Y>;<W>,<H>;<name>;<label>]
 
 image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]
 ^ x, y, w, h, and name work as per button
-^ image is the filename of an image
+^ texture name is the filename of an image
 ^ Position and size units are inventory slots
 
 image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>;<noclip>;<drawborder>]
 ^ x, y, w, h, and name work as per button
-^ image is the filename of an image
+^ texture name is the filename of an image
 ^ Position and size units are inventory slots
 ^ noclip true meand imagebutton doesn't need to be within specified formsize
 ^ drawborder draw button bodrer or not
 
+image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>;<noclip>;<drawborder>;<pressed texture name>]
+^ x, y, w, h, and name work as per button
+^ texture name is the filename of an image
+^ Position and size units are inventory slots
+^ noclip true meand imagebutton doesn't need to be within specified formsize
+^ drawborder draw button bodrer or not
+^ pressed texture name is the filename of an image on pressed state
+
 item_image_button[<X>,<Y>;<W>,<H>;<item name>;<name>;<label>]
 ^ x, y, w, h, name and label work as per button
 ^ item name is the registered name of an item/node,

src/guiFormSpecMenu.cpp

@@ -1116,7 +1116,7 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data,std::string element) {
 void GUIFormSpecMenu::parseImageButton(parserData* data,std::string element,std::string type) {
 	std::vector<std::string> parts = split(element,';');
 
-	if ((parts.size() == 5) || (parts.size() == 7)) {
+	if ((parts.size() == 5) || (parts.size() == 7) || (parts.size() == 8)) {
 		std::vector<std::string> v_pos = split(parts[0],',');
 		std::vector<std::string> v_geom = split(parts[1],',');
 		std::string image_name = parts[2];
@@ -1136,13 +1136,19 @@ void GUIFormSpecMenu::parseImageButton(parserData* data,std::string element,std:
 		bool noclip = false;
 		bool drawborder = true;
 
-		if ((parts.size() == 7)) {
+		if ((parts.size() >= 7)) {
 			if (parts[5] == "true")
 				noclip = true;
 
 			if (parts[6] == "false")
 				drawborder = false;
 		}
+		
+		std::string pressed_image_name = "";
+		
+		if ((parts.size() == 8)) {
+			pressed_image_name = parts[7];
+		}
 
 		core::rect<s32> rect = core::rect<s32>(pos.X, pos.Y, pos.X+geom.X, pos.Y+geom.Y);
 
@@ -1169,21 +1175,31 @@ void GUIFormSpecMenu::parseImageButton(parserData* data,std::string element,std:
 			spec.is_exit = true;
 
 		video::ITexture *texture = 0;
+		video::ITexture *pressed_texture = 0;
 		//if there's no gamedef specified try to get direct
 		//TODO check for possible texture leak
-		if (m_gamedef != 0)
+		if (m_gamedef != 0) {
 			texture = m_gamedef->tsrc()->getTexture(image_name);
-		else {
+			if ((parts.size() == 8)) {
+				pressed_texture = m_gamedef->tsrc()->getTexture(pressed_image_name);
+			}
+		} else {
 			if (fs::PathExists(image_name)) {
 				texture = Environment->getVideoDriver()->getTexture(image_name.c_str());
 				m_Textures.push_back(texture);
 			}
+			if (fs::PathExists(pressed_image_name)) {
+				pressed_texture = Environment->getVideoDriver()->getTexture(pressed_image_name.c_str());
+				m_Textures.push_back(pressed_texture);
+			}
 		}
+		if (parts.size() < 8)
+			pressed_texture = texture;
 
 		gui::IGUIButton *e = Environment->addButton(rect, this, spec.fid, spec.flabel.c_str());
 		e->setUseAlphaChannel(true);
 		e->setImage(texture);
-		e->setPressedImage(texture);
+		e->setPressedImage(pressed_texture);
 		e->setScaleImage(true);
 		e->setNotClipped(noclip);
 		e->setDrawBorder(drawborder);