Delete emote popup when it is closed.

2019-08-13 16:39:22 +02:00
parent 18f3a816ed
commit 7bf5a79f8a
6 changed files with 83 additions and 5 deletions
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <QObject>
+#include <type_traits>
+
+namespace chatterino
+{
+    /// Holds a pointer to a QObject and resets it to nullptr if the QObject
+    /// gets destroyed.
+    template <typename T>
+    class QObjectRef
+    {
+    public:
+        QObjectRef()
+        {
+            static_assert(std::is_base_of_v<QObject, T>);
+        }
+
+        explicit QObjectRef(T* t)
+        {
+            static_assert(std::is_base_of_v<QObject, T>);
+
+            this->swap(t);
+        }
+
+        ~QObjectRef()
+        {
+            this->swap(nullptr);
+        }
+
+        QObjectRef& operator=(T* t)
+        {
+            this->swap(t);
+            return *this;
+        }
+
+        operator bool()
+        {
+            return t_;
+        }
+
+        T* operator->()
+        {
+            return t_;
+        }
+
+        T* get()
+        {
+            return t_;
+        }
+
+        QObject* swap(T* other)
+        {
+            // old
+            if (this->conn_)
+            {
+                QObject::disconnect(this->conn_);
+            }
+
+            // new
+            if (other)
+            {
+                QObject::connect(other, &QObject::destroyed,
+                    [this]() { this->swap(nullptr); });
+            }
+
+            return std::exchange(this->t_, other);
+        }
+
+    private:
+        T* t_{};
+        QMetaObject::Connection conn_;
+    };
+}  // namespace chatterino