api/keys: fix multiple shortcut receivers

We can't depend on std::vector's address of array subscript to remain
constant, duh.

2 files changed, 16 insertions, 19 deletions

diff --git a/opentrack/keybinding-worker.cpp b/opentrack/keybinding-worker.cpp
index 3c801cf2..9ff825a0 100644
--- a/opentrack/keybinding-worker.cpp
+++ b/opentrack/keybinding-worker.cpp
@@ -119,7 +119,7 @@ void KeybindingWorker::run() {
                         k.held = held;
 
                         for (auto& r : receivers)
-                            r(k);
+                            r->operator()(k);
                     };
 
                     joy_ctx.poll(f);
@@ -147,7 +147,7 @@ void KeybindingWorker::run() {
                             k.keycode = i;
 
                             for (auto& r : receivers)
-                                r(k);
+                                r->operator()(k);
                             break;
                         }
                     }
@@ -160,12 +160,13 @@ void KeybindingWorker::run() {
     }
 }
 
-KeybindingWorker::fun* KeybindingWorker::_add_receiver(KeybindingWorker::fun receiver)
+KeybindingWorker::fun* KeybindingWorker::_add_receiver(fun& receiver)
 {
     QMutexLocker l(&mtx);
-    receivers.push_back(receiver);
-    qDebug() << "add receiver" << (long) &receivers[receivers.size()-1];
-    return &receivers[receivers.size()-1];
+    receivers.push_back(std::unique_ptr<fun>(new fun(receiver)));
+    fun* f = receivers[receivers.size() - 1].get();
+    qDebug() << "add receiver" << (long) f;
+    return f;
 }
 
 void KeybindingWorker::remove_receiver(KeybindingWorker::fun* pos)
@@ -175,7 +176,7 @@ void KeybindingWorker::remove_receiver(KeybindingWorker::fun* pos)
 
     for (int i = receivers.size() - 1; i >= 0; i--)
     {
-        if (&receivers[i] == pos)
+        if (receivers[i].get() == pos)
         {
             ok = true;
             qDebug() << "remove receiver" << (long) pos;
diff --git a/opentrack/keybinding-worker.hpp b/opentrack/keybinding-worker.hpp
index 5b669331..c8d8e009 100644
--- a/opentrack/keybinding-worker.hpp
+++ b/opentrack/keybinding-worker.hpp
@@ -47,8 +47,8 @@ private:
     LPDIRECTINPUTDEVICE8 dinkeyboard;
     win32_joy_ctx& joy_ctx;
     volatile bool should_quit;
-    using fun = std::function<void(Key&)>;
-    std::vector<fun> receivers;
+    using fun = std::function<void(const Key&)>;
+    std::vector<std::unique_ptr<fun>> receivers;
     QMutex mtx;
 
     void run() override;
@@ -57,27 +57,23 @@ private:
     KeybindingWorker(const KeybindingWorker&) = delete;
     KeybindingWorker& operator=(KeybindingWorker&) = delete;
     static KeybindingWorker& make();
-    fun* _add_receiver(fun receiver);
+    fun* _add_receiver(fun &receiver);
     void remove_receiver(fun* pos);
     ~KeybindingWorker();
 public:
     class Token
     {
         fun* pos;
-        //Token(const Token&) = delete;
+        Token(const Token&) = delete;
         Token& operator=(Token&) = delete;
     public:
-        Token(fun receiver)
-        {
-            pos = make()._add_receiver(receiver);
-        }
         ~Token()
         {
             make().remove_receiver(pos);
         }
+        Token(fun receiver)
+        {
+            pos = make()._add_receiver(receiver);
+        }
     };
-    static Token add_receiver(fun receiver)
-    {
-        return Token(receiver);
-    }
 };