Qt: Clear all keyboard bind states when focus is lost

src/frontend-common/input_manager.cpp

@@ -915,6 +915,71 @@ bool InputManager::InvokeEvents(InputBindingKey key, float value, GenericInputBi
   return true;
 }
 
+void InputManager::ClearBindStateFromSource(InputBindingKey key)
+{
+  // Why are we doing it this way? Because any of the bindings could cause a reload and invalidate our iterators :(.
+  // Axis handlers should be fine, so we'll do those as a first pass.
+  for (const auto& [match_key, binding] : s_binding_map)
+  {
+    if (key.source_type != match_key.source_type || key.source_subtype != match_key.source_subtype ||
+        key.source_index != match_key.source_index || !IsAxisHandler(binding->handler))
+    {
+      continue;
+    }
+
+    for (u32 i = 0; i < binding->num_keys; i++)
+    {
+      if (binding->keys[i].MaskDirection() != match_key)
+        continue;
+
+      std::get<InputAxisEventHandler>(binding->handler)(0.0f);
+      break;
+    }
+  }
+
+  // Now go through the button handlers, and pick them off.
+  bool matched;
+  do
+  {
+    matched = false;
+
+    for (const auto& [match_key, binding] : s_binding_map)
+    {
+      if (key.source_type != match_key.source_type || key.source_subtype != match_key.source_subtype ||
+          key.source_index != match_key.source_index || IsAxisHandler(binding->handler))
+      {
+        continue;
+      }
+
+      for (u32 i = 0; i < binding->num_keys; i++)
+      {
+        if (binding->keys[i].MaskDirection() != match_key)
+          continue;
+
+        // Skip if we weren't pressed.
+        const u8 bit = static_cast<u8>(1) << i;
+        if ((binding->current_mask & bit) == 0)
+          continue;
+
+        // Only fire handler if we're changing from active state.
+        const u8 current_mask = binding->current_mask;
+        binding->current_mask &= ~bit;
+
+        if (current_mask == binding->full_mask)
+        {
+          std::get<InputButtonEventHandler>(binding->handler)(0.0f);
+          matched = true;
+          break;
+        }
+      }
+
+      // Need to start again, might've reloaded.
+      if (matched)
+        break;
+    }
+  } while (matched);
+}
+
 bool InputManager::PreprocessEvent(InputBindingKey key, float value, GenericInputBinding generic_key)
 {
   // does imgui want the event?