Make OverlayPanel independent of AColor

src/widgets/OverlayPanel.cpp

@@ -10,7 +10,6 @@
 #include "OverlayPanel.h"
 
 #include "Overlay.h"
-#include "../AColor.h"
 #include <algorithm>
 #include <wx/dcclient.h>
 
@@ -134,3 +133,18 @@ void OverlayPanel::Compress()
 
 BEGIN_EVENT_TABLE(OverlayPanel, BackedPanel)
 END_EVENT_TABLE()
+
+// Maybe this class needs a better home
+void DCUnchanger::operator () (wxDC *pDC) const
+{
+   if (pDC) {
+      pDC->SetPen(pen);
+      pDC->SetBrush(brush);
+      pDC->SetLogicalFunction(wxRasterOperationMode(logicalOperation));
+   }
+}
+
+ADCChanger::ADCChanger(wxDC *pDC)
+   : Base{ pDC, ::DCUnchanger{ pDC->GetBrush(), pDC->GetPen(),
+      long(pDC->GetLogicalFunction()) } }
+{}

src/widgets/OverlayPanel.h

@@ -50,4 +50,30 @@ private:
    friend class GetInfoCommand;
 };
 
+/// Used to restore pen, brush and logical-op in a DC back to what they were.
+struct DCUnchanger {
+public:
+   DCUnchanger() {}
+
+   DCUnchanger(const wxBrush &brush_, const wxPen &pen_, long logicalOperation_)
+   : brush(brush_), pen(pen_), logicalOperation(logicalOperation_)
+   {}
+
+   void operator () (wxDC *pDC) const;
+
+   wxBrush brush {};
+   wxPen pen {};
+   long logicalOperation {};
+};
+
+/// Makes temporary drawing context changes that you back out of, RAII style
+//  It's like wxDCPenChanger, etc., but simple and general
+class ADCChanger : public std::unique_ptr<wxDC, ::DCUnchanger>
+{
+   using Base = std::unique_ptr<wxDC, ::DCUnchanger>;
+public:
+   ADCChanger() : Base{} {}
+   ADCChanger(wxDC *pDC);
+};
+
 #endif