DolphinQt: Add generic tooltip controls

Source/Core/DolphinQt/Config/ToolTipControls/ToolTipWidget.h

@@ -0,0 +1,55 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <optional>
+
+#include <QString>
+
+#include "DolphinQt/Config/Graphics/BalloonTip.h"
+
+template <class Derived>
+class ToolTipWidget : public Derived
+{
+public:
+  using Derived::Derived;
+
+  void SetTitle(QString title) { m_title = std::move(title); }
+
+  void SetDescription(QString description) { m_description = std::move(description); }
+
+private:
+  void enterEvent(QEvent* event) override
+  {
+    if (m_timer_id)
+      return;
+    m_timer_id = this->startTimer(300);
+  }
+
+  void leaveEvent(QEvent* event) override
+  {
+    if (m_timer_id)
+    {
+      this->killTimer(*m_timer_id);
+      m_timer_id.reset();
+    }
+    BalloonTip::HideBalloon();
+  }
+
+  void timerEvent(QTimerEvent* event) override
+  {
+    this->killTimer(*m_timer_id);
+    m_timer_id.reset();
+
+    BalloonTip::ShowBalloon(QIcon(), m_title, m_description,
+                            this->parentWidget()->mapToGlobal(GetToolTipPosition()), this);
+  }
+
+  virtual QPoint GetToolTipPosition() const = 0;
+
+  std::optional<int> m_timer_id;
+  QString m_title;
+  QString m_description;
+};