1 files changed, 61 insertions, 1 deletions

diff --git a/backends/keymapper/hardware-key.h b/backends/keymapper/hardware-key.h
index 8ddeada51e..34631a9484 100644
--- a/backends/keymapper/hardware-key.h
+++ b/backends/keymapper/hardware-key.h
@@ -64,6 +64,29 @@ struct HardwareKey {
 	}
 };
 
+/**
+* Describes an available hardware modifier
+*/
+struct HardwareMod {
+	/** unique id used for saving/loading to config */
+	char hwModId[HWKEY_ID_SIZE];
+
+	/** Human readable description */
+	String description;
+
+	/**
+	* The modifier flags that are generated by the 
+	* back-end when this modifier key is pressed.
+	*/
+	byte modFlags;
+
+	HardwareMod(const char *i, byte mf, String desc = "")
+		: modFlags(mf), description(desc) {
+		assert(i);
+		strncpy(hwModId, i, HWKEY_ID_SIZE);
+	}
+};
+
 
 /**
  * Simple class to encapsulate a device's set of HardwareKeys.
@@ -80,6 +103,11 @@ public:
 			delete *it;
 	}
 
+	void addHardwareMod(HardwareMod *mod) {
+		checkForMod(mod);
+		_mods.push_back(mod);
+	}
+
 	void addHardwareKey(HardwareKey *key) {
 		checkForKey(key);
 		_keys.push_back(key);
@@ -99,7 +127,27 @@ public:
 		List<const HardwareKey*>::const_iterator it;
 
 		for (it = _keys.begin(); it != _keys.end(); it++) {
-			if ((*it)->key == keystate)
+			if ((*it)->key.keycode == keystate.keycode)
+				return (*it);
+		}
+		return 0;
+	}
+
+	const HardwareMod *findHardwareMod(const char *id) const {
+		List<const HardwareMod*>::const_iterator it;
+
+		for (it = _mods.begin(); it != _mods.end(); it++) {
+			if (strncmp((*it)->hwModId, id, HWKEY_ID_SIZE) == 0)
+				return (*it);
+		}
+		return 0;
+	}
+
+	const HardwareMod *findHardwareMod(const KeyState& keystate) const {
+		List<const HardwareMod*>::const_iterator it;
+
+		for (it = _mods.begin(); it != _mods.end(); it++) {
+			if ((*it)->modFlags == keystate.flags)
 				return (*it);
 		}
 		return 0;
@@ -127,7 +175,19 @@ private:
 		}
 	}
 
+	void checkForMod(HardwareMod *mod) {
+		List<const HardwareMod*>::iterator it;
+
+		for (it = _mods.begin(); it != _mods.end(); it++) {
+			if (strncmp((*it)->hwModId, mod->hwModId, HWKEY_ID_SIZE) == 0)
+				error("Error adding HardwareMod '%s' - id of %s already in use!", mod->description.c_str(), mod->hwModId);
+			else if ((*it)->modFlags == mod->modFlags)
+				error("Error adding HardwareMod '%s' - modFlags already in use!", mod->description.c_str());
+		}
+	}
+
 	List<const HardwareKey*> _keys;
+	List<const HardwareMod*> _mods;
 };