Factorize input hooks into reusable monitor classes

Those monitors will need some context so this will be useful
in the nearby future.

src/duckstation-qt/inputbindingmonitor.cpp

@@ -0,0 +1,60 @@
+#include "inputbindingmonitor.h"
+
+ControllerInterface::Hook::CallbackResult
+InputButtonBindingMonitor::operator()(const ControllerInterface::Hook& ei) const
+{
+  if (ei.type == ControllerInterface::Hook::Type::Axis)
+  {
+    // wait until it's at least half pushed so we don't get confused between axises with small movement
+    if (std::abs(ei.value) < 0.5f)
+      return ControllerInterface::Hook::CallbackResult::ContinueMonitoring;
+
+    // TODO: this probably should consider the "last value"
+    QMetaObject::invokeMethod(m_parent, "bindToControllerAxis", Q_ARG(int, ei.controller_index),
+                              Q_ARG(int, ei.button_or_axis_number), Q_ARG(std::optional<bool>, ei.value > 0));
+    return ControllerInterface::Hook::CallbackResult::StopMonitoring;
+  }
+  else if (ei.type == ControllerInterface::Hook::Type::Button && ei.value > 0.0f)
+  {
+    QMetaObject::invokeMethod(m_parent, "bindToControllerButton", Q_ARG(int, ei.controller_index),
+                              Q_ARG(int, ei.button_or_axis_number));
+    return ControllerInterface::Hook::CallbackResult::StopMonitoring;
+  }
+
+  return ControllerInterface::Hook::CallbackResult::ContinueMonitoring;
+}
+
+ControllerInterface::Hook::CallbackResult InputAxisBindingMonitor::operator()(const ControllerInterface::Hook& ei) const
+{
+  if (ei.type == ControllerInterface::Hook::Type::Axis)
+  {
+    // wait until it's at least half pushed so we don't get confused between axises with small movement
+    if (std::abs(ei.value) < 0.5f)
+      return ControllerInterface::Hook::CallbackResult::ContinueMonitoring;
+
+    QMetaObject::invokeMethod(m_parent, "bindToControllerAxis", Q_ARG(int, ei.controller_index),
+                              Q_ARG(int, ei.button_or_axis_number), Q_ARG(std::optional<bool>, std::nullopt));
+    return ControllerInterface::Hook::CallbackResult::StopMonitoring;
+  }
+  else if (ei.type == ControllerInterface::Hook::Type::Button && m_axis_type == Controller::AxisType::Half &&
+           ei.value > 0.0f)
+  {
+    QMetaObject::invokeMethod(m_parent, "bindToControllerButton", Q_ARG(int, ei.controller_index),
+                              Q_ARG(int, ei.button_or_axis_number));
+    return ControllerInterface::Hook::CallbackResult::StopMonitoring;
+  }
+
+  return ControllerInterface::Hook::CallbackResult::ContinueMonitoring;
+}
+
+ControllerInterface::Hook::CallbackResult
+InputRumbleBindingMonitor::operator()(const ControllerInterface::Hook& ei) const
+{
+  if (ei.type == ControllerInterface::Hook::Type::Button && ei.value > 0.0f)
+  {
+    QMetaObject::invokeMethod(m_parent, "bindToControllerRumble", Q_ARG(int, ei.controller_index));
+    return ControllerInterface::Hook::CallbackResult::StopMonitoring;
+  }
+
+  return ControllerInterface::Hook::CallbackResult::ContinueMonitoring;
+}