From f780bae05cc2fdd23a6d7326c770783da8d94ea3 Mon Sep 17 00:00:00 2001
From: Hugues Ross <hugues.ross@gmail.com>
Date: Sat, 11 Apr 2020 16:39:30 -0400
Subject: Formspecs: Add state-selection to style elements (#9378)

---
 src/gui/StyleSpec.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 59 insertions(+), 6 deletions(-)

(limited to 'src/gui/StyleSpec.h')

diff --git a/src/gui/StyleSpec.h b/src/gui/StyleSpec.h
index 999c1d237..799fbf46d 100644
--- a/src/gui/StyleSpec.h
+++ b/src/gui/StyleSpec.h
@@ -18,6 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "client/tile.h" // ITextureSource
+#include "debug.h"
 #include "irrlichttypes_extrabloated.h"
 #include "util/string.h"
 #include <array>
@@ -31,25 +32,34 @@ public:
 	{
 		TEXTCOLOR,
 		BGCOLOR,
-		BGCOLOR_HOVERED,
-		BGCOLOR_PRESSED,
+		BGCOLOR_HOVERED, // Note: Deprecated property
+		BGCOLOR_PRESSED, // Note: Deprecated property
 		NOCLIP,
 		BORDER,
 		BGIMG,
-		BGIMG_HOVERED,
+		BGIMG_HOVERED, // Note: Deprecated property
 		BGIMG_MIDDLE,
-		BGIMG_PRESSED,
+		BGIMG_PRESSED, // Note: Deprecated property
 		FGIMG,
-		FGIMG_HOVERED,
-		FGIMG_PRESSED,
+		FGIMG_HOVERED, // Note: Deprecated property
+		FGIMG_PRESSED, // Note: Deprecated property
 		ALPHA,
 		NUM_PROPERTIES,
 		NONE
 	};
+	enum State
+	{
+		STATE_DEFAULT = 0,
+		STATE_HOVERED = 1 << 0,
+		STATE_PRESSED = 1 << 1,
+		NUM_STATES = 1 << 2,
+		STATE_INVALID = 1 << 3,
+	};
 
 private:
 	std::array<bool, NUM_PROPERTIES> property_set{};
 	std::array<std::string, NUM_PROPERTIES> properties;
+	State state_map = STATE_DEFAULT;
 
 public:
 	static Property GetPropertyByName(const std::string &name)
@@ -99,6 +109,49 @@ public:
 		property_set[prop] = true;
 	}
 
+	//! Parses a name and returns the corresponding state enum
+	static State getStateByName(const std::string &name)
+	{
+		if (name == "default") {
+			return STATE_DEFAULT;
+		} else if (name == "hovered") {
+			return STATE_HOVERED;
+		} else if (name == "pressed") {
+			return STATE_PRESSED;
+		} else {
+			return STATE_INVALID;
+		}
+	}
+
+	//! Gets the state that this style is intended for
+	State getState() const
+	{
+		return state_map;
+	}
+
+	//! Set the given state on this style
+	void addState(State state)
+	{
+		FATAL_ERROR_IF(state >= NUM_STATES, "Out-of-bounds state received");
+
+		state_map = static_cast<State>(state_map | state);
+	}
+
+	//! Using a list of styles mapped to state values, calculate the final
+	//  combined style for a state by propagating values in its component states
+	static StyleSpec getStyleFromStatePropagation(const std::array<StyleSpec, NUM_STATES> &styles, State state)
+	{
+		StyleSpec temp = styles[StyleSpec::STATE_DEFAULT];
+		temp.state_map = state;
+		for (int i = StyleSpec::STATE_DEFAULT + 1; i <= state; i++) {
+			if ((state & i) != 0) {
+				temp = temp | styles[i];
+			}
+		}
+
+		return temp;
+	}
+
 	video::SColor getColor(Property prop, video::SColor def) const
 	{
 		const auto &val = properties[prop];
-- 
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