Single instance

shared/mapping.cpp

@@ -17,6 +17,8 @@ const char* action_type_token(ActionType type) {
             return "key";
         case ActionType::Command:
             return "command";
+        case ActionType::KeyHold:
+            return "keyhold";
         case ActionType::Disabled:
         default:
             return "disabled";
@@ -30,6 +32,9 @@ ActionType action_type_from_token(const std::string& token) {
     if (token == "command") {
         return ActionType::Command;
     }
+    if (token == "keyhold") {
+        return ActionType::KeyHold;
+    }
     return ActionType::Disabled;
 }
 

shared/mapping.h

@@ -5,6 +5,7 @@
 //     G1=key:ctrl+c,ctrl+v
 //     G2=command:/usr/bin/firefox
 //     G3=disabled:
+//     G4=keyhold:ctrl+w      (held down while G4 is held down)
 #ifndef GKEYMAPPER_MAPPING_H
 #define GKEYMAPPER_MAPPING_H
 
@@ -16,7 +17,10 @@ namespace gkeymapper {
 
 constexpr int kNumKeys = 9; // G1..G9
 
-enum class ActionType { Disabled, Key, Command };
+// KeyHold keeps its keys down until the G key is released; the others fire once
+// on the press. The order is not part of the file format (the tokens are), but
+// keep it stable: the GUI maps dropdown indices explicitly.
+enum class ActionType { Disabled, Key, Command, KeyHold };
 
 struct Mapping {
     ActionType type = ActionType::Disabled;