Add styles to most elements

build/android/jni/Android.mk

@@ -177,6 +177,7 @@ LOCAL_SRC_FILES := \
 		jni/src/filesys.cpp                       \
 		jni/src/genericobject.cpp                 \
 		jni/src/gettext.cpp                       \
+		jni/src/gui/guiButton.cpp                 \
 		jni/src/gui/guiChatConsole.cpp            \
 		jni/src/gui/guiConfirmRegistration.cpp    \
 		jni/src/gui/guiEditBoxWithScrollbar.cpp   \

builtin/mainmenu/dlg_delete_content.lua

@@ -22,7 +22,7 @@ local function delete_content_formspec(dialogdata)
 		"size[11.5,4.5,true]" ..
 		"label[2,2;" ..
 		fgettext("Are you sure you want to delete \"$1\"?", dialogdata.content.name) .. "]"..
-		"style[dlg_delete_content_confirm;bgcolor;red]" ..
+		"style[dlg_delete_content_confirm;bgcolor=red]" ..
 		"button[3.25,3.5;2.5,0.5;dlg_delete_content_confirm;" .. fgettext("Delete") .. "]" ..
 		"button[5.75,3.5;2.5,0.5;dlg_delete_content_cancel;" .. fgettext("Cancel") .. "]"
 

builtin/mainmenu/dlg_delete_world.lua

@@ -21,7 +21,7 @@ local function delete_world_formspec(dialogdata)
 		"size[10,2.5,true]" ..
 		"label[0.5,0.5;" ..
 		fgettext("Delete World \"$1\"?", dialogdata.delete_name) .. "]" ..
-		"style[world_delete_confirm;bgcolor;red]" ..
+		"style[world_delete_confirm;bgcolor=red]" ..
 		"button[0.5,1.5;2.5,0.5;world_delete_confirm;" .. fgettext("Delete") .. "]" ..
 		"button[7.0,1.5;2.5,0.5;world_delete_cancel;" .. fgettext("Cancel") .. "]"
 	return retval

builtin/mainmenu/tab_local.lua

@@ -102,9 +102,6 @@ local function get_formspec(tabview, name, tabdata)
 				)
 
 	retval = retval ..
-			"style_type[button;bgcolor;#006699]" ..
-			"style[world_delete;bgcolor;red]" ..
-			"style[world_delete;textcolor;yellow]" ..
 			"button[4,3.95;2.6,1;world_delete;".. fgettext("Delete") .. "]" ..
 			"button[6.5,3.95;2.8,1;world_configure;".. fgettext("Configure") .. "]" ..
 			"button[9.2,3.95;2.5,1;world_create;".. fgettext("New") .. "]" ..

doc/lua_api.txt

@@ -1884,7 +1884,10 @@ When displaying text which can contain formspec code, e.g. text set by a player,
 use `minetest.formspec_escape`.
 For coloured text you can use `minetest.colorize`.
 
-WARNING: Minetest allows you to add elements to every single formspec instance
+**WARNING**: do _not_ use a element name starting with `key_`; those names are
+reserved to pass key press events to formspec!
+
+**WARNING**: Minetest allows you to add elements to every single formspec instance
 using `player:set_formspec_prepend()`, which may be the reason backgrounds are
 appearing when you don't expect them to, or why things are styled differently
 to normal. See [`no_prepend[]`] and [Styling Formspecs].
@@ -2351,22 +2354,17 @@ Elements
         * `span=<value>`: number of following columns to affect
           (default: infinite).
 
-**Note**: do _not_ use a element name starting with `key_`; those names are
+### `style[<name>;<prop1>;<prop2>;...]`
-reserved to pass key press events to formspec!
 
-### `style[<name>;<propery>;<value]`
+* Set the style for the named element `name`.
-
+* Note: this **must** be before the element is defined.
-Set the style for the named element `name`.
+* See [Styling Formspecs].
-Note: this **must** be before the element's tag.
-
-See [Styling Formspecs].
 
 
-### `style_type[<type>;<propery>;<value>]`
+### `style_type[<type>;<prop1>;<prop2>;...]`
 
-Sets the style for all elements of type `type` which appear after this tag.
+* Sets the style for all elements of type `type` which appear after this element.
-
+* See [Styling Formspecs].
-See [Styling Formspecs].
 
 Migrating to Real Coordinates
 -----------------------------
@@ -2406,27 +2404,82 @@ offsets when migrating:
 Styling Formspecs
 -----------------
 
-Formspec elements can be themed using the style tags:
+Formspec elements can be themed using the style elements:
 
-	style[ELEMENT_NAME;PROPERTY;VALUE]
+    style[<name>;<prop1>;<prop2>;...]
-	style_type[ELEMENT_TYPE;PROPERTY;VALUE]
+    style_type[<type>;<prop1>;<prop2>;...]
+
+Where a prop is:
+
+    property_name=property_value
 
 For example:
 
-	style_type[button;bgcolor;#006699]
+    style_type[button;bgcolor=#006699]
-	style[world_delete;bgcolor;#ff0000]
+    style[world_delete;bgcolor=red;textcolor=yellow]
     button[4,3.95;2.6,1;world_delete;Delete]
 
+Setting a property to nothing will reset it to the default value. For example:
+
+    style_type[button;bgimg=button.png;bgimg_pressed=button_pressed.png;border=false]
+    style[btn_exit;bgimg=;bgimg_pressed=;border=;bgcolor=red]
+
+
+### Supported Element Types
+
+Some types may inherit styles from parent types.
+
+* button
+* button_exit, inherits from button
+* checkbox
+* scrollbar
+* table
+* textlist
+* dropdown
+* field
+* pwdfield, inherits from field
+* textarea
+* label
+* vertlabel, inherits from field
+* image_button
+* item_image_button, inherits from image_button
+* tabheader
+
+
 ### Valid Properties
 
-* button and button_exit
+* button, button_exit
-	* bgcolor - sets button tint
+    * bgcolor - color, sets button tint
-	* textcolor
+    * textcolor - color, default white
+    * border - boolean, draw border. Set to false to hide the bevelled button pane.  Default true.
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+    * bgimg - standard image. Defaults to none.
+    * bgimg_pressed - image when pressed. Defaults to bgimg when not provided.
+    * alpha - boolean, whether to draw alpha in bgimg. Default true.
+* checkbox
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+* scrollbar
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+* table, textlist
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+* dropdown
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+* field, pwdfield, textarea
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+    * border - set to false to hide the textbox background and border. Default true.
+    * textcolor - color. Default white.
+* label, vertlabel
+    * bgcolor - color. Default unset.
+    * textcolor - color. Default white.
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+    * border - boolean, set to true to get a border. Default true.
+* image_button, item_image_button
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
+    * border - boolean, draw border. Set to false to hide the bevelled button pane. Default false.
+    * alpha - boolean, whether to draw alpha in bgimg. Default true.
 * tabheader
-	* bgcolor - tab background
+    * noclip - boolean, set to true to allow the element to exceed formspec bounds.
-	* textcolor
+    * textcolor - color. Default white.
-
-
 
 Inventory
 =========

src/client/renderingengine.cpp

@@ -61,7 +61,7 @@ static gui::GUISkin* createSkin(gui::IGUIEnvironment *environment,
 	gui::GUISkin *skin = new gui::GUISkin(type, driver);
 
 	gui::IGUIFont *builtinfont = environment->getBuiltInFont();
-	gui::IGUIFontBitmap* bitfont = 0;
+	gui::IGUIFontBitmap *bitfont = nullptr;
 	if (builtinfont && builtinfont->getType() == gui::EGFT_BITMAP)
 		bitfont = (gui::IGUIFontBitmap*)builtinfont;
 

src/gui/StyleSpec.h

@@ -18,85 +18,118 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "irrlichttypes_extrabloated.h"
+#include <array>
 
 #pragma once
 
-
 class StyleSpec
 {
 public:
-	enum Property {
+	enum Property
-		NONE = 0,
+	{
 		TEXTCOLOR,
 		BGCOLOR,
-		NUM_PROPERTIES
+		NOCLIP,
+		BORDER,
+		BGIMG,
+		BGIMG_PRESSED,
+		ALPHA,
+		NUM_PROPERTIES,
+		NONE
 	};
 
 private:
-	std::unordered_map<Property, std::string> properties;
+	std::array<bool, NUM_PROPERTIES> property_set;
+	std::array<std::string, NUM_PROPERTIES> properties;
 
 public:
-	static Property GetPropertyByName(const std::string &name) {
+	static Property GetPropertyByName(const std::string &name)
+	{
 		if (name == "textcolor") {
 			return TEXTCOLOR;
 		} else if (name == "bgcolor") {
 			return BGCOLOR;
+		} else if (name == "noclip") {
+			return NOCLIP;
+		} else if (name == "border") {
+			return BORDER;
+		} else if (name == "bgimg") {
+			return BGIMG;
+		} else if (name == "bgimg_pressed") {
+			return BGIMG_PRESSED;
+		} else if (name == "alpha") {
+			return ALPHA;
 		} else {
 			return NONE;
 		}
 	}
 
-	std::string get(Property prop, std::string def) const {
+	std::string get(Property prop, std::string def) const
-		auto it = properties.find(prop);
+	{
-		if (it == properties.end()) {
+		const auto &val = properties[prop];
+		return val.empty() ? def : val;
+	}
+
+	void set(Property prop, const std::string &value)
+	{
+		properties[prop] = value;
+		property_set[prop] = true;
+	}
+
+	video::SColor getColor(Property prop, video::SColor def) const
+	{
+		const auto &val = properties[prop];
+		if (val.empty()) {
 			return def;
 		}
 
-		return it->second;
+		parseColorString(val, def, false, 0xFF);
-	}
-
-	void set(Property prop, std::string value) {
-		properties[prop] = std::move(value);
-	}
-
-	video::SColor getColor(Property prop, video::SColor def) const {
-		auto it = properties.find(prop);
-		if (it == properties.end()) {
 		return def;
 	}
 
-		parseColorString(it->second, def, false, 0xFF);
+	video::SColor getColor(Property prop) const
-		return def;
+	{
-	}
+		const auto &val = properties[prop];
-
+		FATAL_ERROR_IF(val.empty(), "Unexpected missing property");
-	video::SColor getColor(Property prop) const {
-		auto it = properties.find(prop);
-		FATAL_ERROR_IF(it == properties.end(), "Unexpected missing property");
 
 		video::SColor color;
-		parseColorString(it->second, color, false, 0xFF);
+		parseColorString(val, color, false, 0xFF);
 		return color;
 	}
 
-	bool hasProperty(Property prop) const {
+	bool getBool(Property prop, bool def) const
-		return properties.find(prop) != properties.end();
+	{
+		const auto &val = properties[prop];
+		if (val.empty()) {
+			return def;
 		}
 
-	StyleSpec &operator|=(const StyleSpec &other) {
+		return is_yes(val);
-		for (size_t i = 1; i < NUM_PROPERTIES; i++) {
+	}
+
+	inline bool isNotDefault(Property prop) const
+	{
+		return !properties[prop].empty();
+	}
+
+	inline bool hasProperty(Property prop) const { return property_set[prop]; }
+
+	StyleSpec &operator|=(const StyleSpec &other)
+	{
+		for (size_t i = 0; i < NUM_PROPERTIES; i++) {
 			auto prop = (Property)i;
 			if (other.hasProperty(prop)) {
-				properties[prop] = other.get(prop, "");
+				set(prop, other.get(prop, ""));
 			}
 		}
 
 		return *this;
 	}
 
-	StyleSpec operator|(const StyleSpec &other) const {
+	StyleSpec operator|(const StyleSpec &other) const
+	{
 		StyleSpec newspec = *this;
 		newspec |= other;
 		return newspec;
 	}
 };
-

src/gui/guiFormSpecMenu.cpp

@@ -500,6 +500,9 @@ void GUIFormSpecMenu::parseCheckbox(parserData* data, const std::string &element
 		gui::IGUICheckBox* e = Environment->addCheckBox(fselected, rect, this,
 					spec.fid, spec.flabel.c_str());
 
+		auto style = getStyleForElement("checkbox", name);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+
 		if (spec.fname == data->focused_fieldname) {
 			Environment->setFocus(e);
 		}
@@ -556,6 +559,9 @@ void GUIFormSpecMenu::parseScrollBar(parserData* data, const std::string &elemen
 		gui::IGUIScrollBar* e =
 				Environment->addScrollBar(is_horizontal,rect,this,spec.fid);
 
+		auto style = getStyleForElement("scrollbar", name);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+
 		e->setMax(1000);
 		e->setMin(0);
 		e->setPos(stoi(parts[4]));
@@ -702,15 +708,35 @@ void GUIFormSpecMenu::parseButton(parserData* data, const std::string &element,
 
 		GUIButton *e = GUIButton::addButton(Environment, rect, this, spec.fid, spec.flabel.c_str());
 
-		auto style = getThemeForElement(type, name);
+		auto style = getStyleForElement(type, name, (type != "button") ? "button" : "");
-		if (style.hasProperty(StyleSpec::BGCOLOR)) {
+		if (style.isNotDefault(StyleSpec::BGCOLOR)) {
 			e->setColor(style.getColor(StyleSpec::BGCOLOR));
 		}
-		if (style.hasProperty(StyleSpec::TEXTCOLOR)) {
+		if (style.isNotDefault(StyleSpec::TEXTCOLOR)) {
 			e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR));
 		}
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+		e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
 
-//		e->setSprite();
+		if (style.isNotDefault(StyleSpec::BGIMG)) {
+			std::string image_name = style.get(StyleSpec::BGIMG, "");
+			std::string pressed_image_name = style.get(StyleSpec::BGIMG_PRESSED, "");
+
+			video::ITexture *texture = 0;
+			video::ITexture *pressed_texture = 0;
+			texture = m_tsrc->getTexture(image_name);
+			if (!pressed_image_name.empty())
+				pressed_texture = m_tsrc->getTexture(pressed_image_name);
+			else
+				pressed_texture = texture;
+
+			e->setUseAlphaChannel(style.getBool(StyleSpec::ALPHA, true));
+			e->setImage(guiScalingImageButton(
+					Environment->getVideoDriver(), texture, geom.X, geom.Y));
+			e->setPressedImage(guiScalingImageButton(
+					Environment->getVideoDriver(), pressed_texture, geom.X, geom.Y));
+			e->setScaleImage(true);
+		}
 
 		if (spec.fname == data->focused_fieldname) {
 			Environment->setFocus(e);
@@ -889,6 +915,9 @@ void GUIFormSpecMenu::parseTable(parserData* data, const std::string &element)
 		if (!str_initial_selection.empty() && str_initial_selection != "0")
 			e->setSelected(stoi(str_initial_selection));
 
+		auto style = getStyleForElement("table", name);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+
 		m_tables.emplace_back(spec, e);
 		m_fields.push_back(spec);
 		return;
@@ -963,6 +992,9 @@ void GUIFormSpecMenu::parseTextList(parserData* data, const std::string &element
 		if (!str_initial_selection.empty() && str_initial_selection != "0")
 			e->setSelected(stoi(str_initial_selection));
 
+		auto style = getStyleForElement("textlist", name);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+
 		m_tables.emplace_back(spec, e);
 		m_fields.push_back(spec);
 		return;
@@ -1035,6 +1067,9 @@ void GUIFormSpecMenu::parseDropDown(parserData* data, const std::string &element
 		if (!str_initial_selection.empty())
 			e->setSelected(stoi(str_initial_selection)-1);
 
+		auto style = getStyleForElement("dropdown", name);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+
 		m_fields.push_back(spec);
 
 		m_dropdowns.emplace_back(spec, std::vector<std::string>());
@@ -1118,6 +1153,11 @@ void GUIFormSpecMenu::parsePwdField(parserData* data, const std::string &element
 
 		e->setPasswordBox(true,L'*');
 
+		auto style = getStyleForElement("pwdfield", name, "field");
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+		e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
+		e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+
 		irr::SEvent evt;
 		evt.EventType            = EET_KEY_INPUT_EVENT;
 		evt.KeyInput.Key         = KEY_END;
@@ -1194,6 +1234,14 @@ void GUIFormSpecMenu::createTextField(parserData *data, FieldSpec &spec,
 			evt.KeyInput.PressedDown = true;
 			e->OnEvent(evt);
 		}
+
+		auto style = getStyleForElement(is_multiline ? "textarea" : "field", spec.fname);
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+		e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
+		e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+		if (style.get(StyleSpec::BGCOLOR, "") == "transparent") {
+			e->setDrawBackground(false);
+		}
 	}
 
 	if (!spec.flabel.empty()) {
@@ -1407,6 +1455,15 @@ void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 			gui::IGUIStaticText *e = gui::StaticText::add(Environment,
 				spec.flabel.c_str(), rect, false, false, this, spec.fid);
 			e->setTextAlignment(gui::EGUIA_UPPERLEFT, gui::EGUIA_CENTER);
+
+			auto style = getStyleForElement("label", spec.fname);
+			e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+			e->setDrawBorder(style.getBool(StyleSpec::BORDER, false));
+			e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+			if (style.isNotDefault(StyleSpec::BGCOLOR)) {
+				e->setBackgroundColor(style.getColor(StyleSpec::BGCOLOR));
+			}
+
 			m_fields.push_back(spec);
 		}
 
@@ -1475,9 +1532,18 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &elemen
 			L"",
 			258+m_fields.size()
 		);
-		gui::IGUIStaticText *t = gui::StaticText::add(Environment, spec.flabel.c_str(),
+		gui::IGUIStaticText *e = gui::StaticText::add(Environment, spec.flabel.c_str(),
 			rect, false, false, this, spec.fid);
-		t->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_CENTER);
+		e->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_CENTER);
+
+		auto style = getStyleForElement("vertlabel", spec.fname, "label");
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+		e->setDrawBorder(style.getBool(StyleSpec::BORDER, false));
+		e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+		if (style.isNotDefault(StyleSpec::BGCOLOR)) {
+			e->setBackgroundColor(style.getColor(StyleSpec::BGCOLOR));
+		}
+
 		m_fields.push_back(spec);
 		return;
 	}
@@ -1563,14 +1629,21 @@ void GUIFormSpecMenu::parseImageButton(parserData* data, const std::string &elem
 			Environment->setFocus(e);
 		}
 
-		e->setUseAlphaChannel(true);
+		auto style = getStyleForElement("image_button", spec.fname);
+
+		e->setUseAlphaChannel(style.getBool(StyleSpec::ALPHA, true));
 		e->setImage(guiScalingImageButton(
 			Environment->getVideoDriver(), texture, geom.X, geom.Y));
 		e->setPressedImage(guiScalingImageButton(
 			Environment->getVideoDriver(), pressed_texture, geom.X, geom.Y));
 		e->setScaleImage(true);
+		if (parts.size() >= 7) {
 			e->setNotClipped(noclip);
 			e->setDrawBorder(drawborder);
+		} else {
+			e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+			e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
+		}
 
 		m_fields.push_back(spec);
 		return;
@@ -1656,7 +1729,7 @@ void GUIFormSpecMenu::parseTabHeader(parserData* data, const std::string &elemen
 				pos.Y+geom.Y);
 
 		gui::IGUITabControl *e = Environment->addTabControl(rect, this,
-				false, show_border, spec.fid);
+				show_background, show_border, spec.fid);
 		e->setAlignment(irr::gui::EGUIA_UPPERLEFT, irr::gui::EGUIA_UPPERLEFT,
 				irr::gui::EGUIA_UPPERLEFT, irr::gui::EGUIA_LOWERRIGHT);
 		e->setTabHeight(geom.Y);
@@ -1665,16 +1738,13 @@ void GUIFormSpecMenu::parseTabHeader(parserData* data, const std::string &elemen
 			Environment->setFocus(e);
 		}
 
-		e->setNotClipped(true);
+		auto style = getStyleForElement("tabheader", name);
-
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, true));
-		auto style = getThemeForElement("tabheader", name);
 
 		for (const std::string &button : buttons) {
 			auto tab = e->addTab(unescape_translate(unescape_string(
 				utf8_to_wide(button))).c_str(), -1);
-			tab->setDrawBackground(false);
+			if (style.isNotDefault(StyleSpec::BGCOLOR))
-			tab->setBackgroundColor(video::SColor(0xFFFF0000));
-			if (style.hasProperty(StyleSpec::BGCOLOR))
 				tab->setBackgroundColor(style.getColor(StyleSpec::BGCOLOR));
 
 			tab->setTextColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
@@ -1753,6 +1823,10 @@ void GUIFormSpecMenu::parseItemImageButton(parserData* data, const std::string &
 
 		gui::IGUIButton *e = Environment->addButton(rect, this, spec.fid, L"");
 
+		auto style = getStyleForElement("item_image_button", spec.fname, "image_button");
+		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
+		e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
+
 		if (spec.fname == data->focused_fieldname) {
 			Environment->setFocus(e);
 		}
@@ -2043,32 +2117,48 @@ bool GUIFormSpecMenu::parseStyle(parserData *data, const std::string &element, b
 {
 	std::vector<std::string> parts = split(element, ';');
 
-	if (parts.size() != 3) {
+	if (parts.size() < 2) {
 		errorstream << "Invalid style element (" << parts.size() << "): '" << element
 					<< "'" << std::endl;
 		return false;
 	}
 
 	std::string selector = trim(parts[0]);
-	std::string propname = trim(parts[1]);
+	if (selector.empty()) {
-	std::string value    = trim(parts[2]);
+		errorstream << "Invalid style element (Selector required): '" << element
-
-	StyleSpec::Property prop = StyleSpec::GetPropertyByName(propname);
-	if (prop == StyleSpec::NONE) {
-		errorstream << "Invalid style element (Unknown property " << prop << "): '" << element
 					<< "'" << std::endl;
 		return false;
 	}
 
 	StyleSpec spec;
-	spec.set(prop, value);
 
-	if (selector.empty()) {
+	for (size_t i = 1; i < parts.size(); i++) {
-		errorstream << "Invalid style element (Selector required): '" << element
+		size_t equal_pos = parts[i].find('=');
+		if (equal_pos == std::string::npos) {
+			errorstream << "Invalid style element (Property missing value): '" << element
 						<< "'" << std::endl;
 			return false;
 		}
 
+		std::string propname = trim(parts[i].substr(0, equal_pos));
+		std::string value    = trim(unescape_string(parts[i].substr(equal_pos + 1)));
+
+		std::transform(propname.begin(), propname.end(), propname.begin(), ::tolower);
+
+		StyleSpec::Property prop = StyleSpec::GetPropertyByName(propname);
+		if (prop == StyleSpec::NONE) {
+			if (property_warned.find(propname) != property_warned.end()) {
+				warningstream << "Invalid style element (Unknown property " << propname << "): '"
+						<< element
+						<< "'" << std::endl;
+				property_warned.insert(propname);
+			}
+			return false;
+		}
+
+		spec.set(prop, value);
+	}
+
 	if (style_type) {
 		theme_by_type[selector] |= spec;
 	} else {
@@ -4115,9 +4205,17 @@ std::wstring GUIFormSpecMenu::getLabelByID(s32 id)
 	return L"";
 }
 
-StyleSpec GUIFormSpecMenu::getThemeForElement(const std::string &type, const std::string &name) {
+StyleSpec GUIFormSpecMenu::getStyleForElement(const std::string &type,
+		const std::string &name, const std::string &parent_type) {
 	StyleSpec ret;
 
+	if (!parent_type.empty()) {
+		auto it = theme_by_type.find(parent_type);
+		if (it != theme_by_type.end()) {
+			ret |= it->second;
+		}
+	}
+
 	auto it = theme_by_type.find(type);
 	if (it != theme_by_type.end()) {
 		ret |= it->second;

src/gui/guiFormSpecMenu.h

@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include <utility>
 #include <stack>
+#include <unordered_set>
 
 #include "irrlichttypes_extrabloated.h"
 #include "inventorymanager.h"
@@ -404,8 +405,10 @@ protected:
 
 	std::unordered_map<std::string, StyleSpec> theme_by_type;
 	std::unordered_map<std::string, StyleSpec> theme_by_name;
+	std::unordered_set<std::string> property_warned;
 
-	StyleSpec getThemeForElement(const std::string &type, const std::string &name);
+	StyleSpec getStyleForElement(const std::string &type,
+			const std::string &name="", const std::string &parent_type="");
 
 	v2s32 padding;
 	v2f32 spacing;
@@ -574,7 +577,6 @@ private:
 	 * and the default value for the setting is true.
 	 */
 	bool m_remap_dbl_click;
-
 };
 
 class FormspecFormSource: public IFormSource