ControllerInterface: Add a way to register callbacks

This adds RegisterHotplugCallback() to register a callback which will
be invoked by the input backends' hotplug threads when there is a new
device, so that Core (GCKeyboard, GCPad, Wiimote, Hotkey) can reload
the configuration without adding a dependency to Core from InputCommon.

1 files changed, 22 insertions, 0 deletions

diff --git a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
index 700d390b92..cc80b7b234 100644
--- a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
+++ b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
@@ -173,6 +173,28 @@ void ControllerInterface::UpdateInput()
 }
 
 //
+// RegisterHotplugCallback
+//
+// Register a callback to be called from the input backends' hotplug thread
+// when there is a new device
+//
+void ControllerInterface::RegisterHotplugCallback(std::function<void()> callback)
+{
+  m_hotplug_callbacks.emplace_back(std::move(callback));
+}
+
+//
+// InvokeHotplugCallbacks
+//
+// Invoke all callbacks that were registered
+//
+void ControllerInterface::InvokeHotplugCallbacks() const
+{
+  for (const auto& callback : m_hotplug_callbacks)
+    callback();
+}
+
+//
 // InputReference :: State
 //
 // Gets the state of an input reference