Qt/TAS: Implement turbo mode

Source/Core/DolphinQt/TAS/TASCheckBox.cpp

@@ -0,0 +1,40 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt/TAS/TASCheckBox.h"
+
+#include <QMouseEvent>
+
+#include "Core/Movie.h"
+
+TASCheckBox::TASCheckBox(const QString& text) : QCheckBox(text)
+{
+  setTristate(true);
+}
+
+bool TASCheckBox::GetValue()
+{
+  if (checkState() == Qt::PartiallyChecked)
+    return Movie::GetCurrentFrame() % 2 == static_cast<u64>(m_trigger_on_odd);
+
+  return isChecked();
+}
+
+void TASCheckBox::mousePressEvent(QMouseEvent* event)
+{
+  if (event->button() != Qt::RightButton)
+  {
+    setChecked(!isChecked());
+    return;
+  }
+
+  if (checkState() == Qt::PartiallyChecked)
+  {
+    setCheckState(Qt::Unchecked);
+    return;
+  }
+
+  m_trigger_on_odd = Movie::GetCurrentFrame() % 2 == 0;
+  setCheckState(Qt::PartiallyChecked);
+}