Enable button toggle for keyboard in the modifier button

src/input_common/keyboard.cpp

@@ -12,20 +12,37 @@ namespace InputCommon {
 
 class KeyButton final : public Input::ButtonDevice {
 public:
-    explicit KeyButton(std::shared_ptr<KeyButtonList> key_button_list_)
-        : key_button_list(std::move(key_button_list_)) {}
+    explicit KeyButton(std::shared_ptr<KeyButtonList> key_button_list_, bool toggle_)
+        : key_button_list(std::move(key_button_list_)), toggle(toggle_) {}
 
     ~KeyButton() override;
 
     bool GetStatus() const override {
+        if (toggle) {
+            return toggled_status.load();
+        }
         return status.load();
     }
 
+    void ToggleButton() {
+        if (!lock) {
+            lock = true;
+            toggled_status.store(!toggled_status.load());
+        }
+    }
+
+    void UnlockButton() {
+        lock = false;
+    }
+
     friend class KeyButtonList;
 
 private:
     std::shared_ptr<KeyButtonList> key_button_list;
     std::atomic<bool> status{false};
+    std::atomic<bool> toggled_status{false};
+    bool lock = {};
+    const bool toggle;
 };
 
 struct KeyButtonPair {
@@ -51,6 +68,11 @@ public:
         for (const KeyButtonPair& pair : list) {
             if (pair.key_code == key_code) {
                 pair.key_button->status.store(pressed);
+                if (pressed) {
+                    pair.key_button->ToggleButton();
+                } else {
+                    pair.key_button->UnlockButton();
+                }
             }
         }
     }
@@ -75,7 +97,8 @@ KeyButton::~KeyButton() {
 
 std::unique_ptr<Input::ButtonDevice> Keyboard::Create(const Common::ParamPackage& params) {
     const int key_code = params.Get("code", 0);
-    std::unique_ptr<KeyButton> button = std::make_unique<KeyButton>(key_button_list);
+    const bool toggle = params.Get("toggle", false);
+    std::unique_ptr<KeyButton> button = std::make_unique<KeyButton>(key_button_list, toggle);
     key_button_list->AddKeyButton(key_code, button.get());
     return button;
 }