refactor: buttons and friends (#6102)

src/widgets/buttons/DimButton.cpp

@@ -0,0 +1,36 @@
+#include "widgets/buttons/DimButton.hpp"
+
+namespace chatterino {
+
+DimButton::DimButton(BaseWidget *parent)
+    : Button(parent)
+{
+}
+
+DimButton::Dim DimButton::dim() const noexcept
+{
+    return this->dim_;
+}
+
+void DimButton::setDim(Dim value)
+{
+    this->dim_ = value;
+
+    this->invalidateContent();
+}
+
+qreal DimButton::currentContentOpacity() const noexcept
+{
+    if (this->dim_ == Dim::None || this->mouseOver())
+    {
+        return 1;
+    }
+    if (this->dim_ == Dim::Some)
+    {
+        return 0.7;
+    }
+
+    return 0.15;
+}
+
+}  // namespace chatterino