WX: HiDPI Support Framework

Portable flexible HiDPI image loading and other support for Windows/GTK/OSX.

Source/Core/DolphinWX/DolphinSlider.h

@@ -0,0 +1,51 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <wx/slider.h>
+
+// wxSlider has several bugs, including not scaling with DPI.
+// This extended slider class tries to paper over the flaws.
+// NOTE: wxSL_LABELS is not supported because it doesn't work correctly.
+class DolphinSlider : public wxSlider
+{
+public:
+  DolphinSlider();
+  ~DolphinSlider() override;
+  DolphinSlider(const DolphinSlider&) = delete;
+
+  DolphinSlider(wxWindow* parent, wxWindowID id, int value, int min_value, int max_value,
+                const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
+                long style = wxSL_HORIZONTAL, const wxValidator& validator = wxDefaultValidator,
+                const wxString& name = wxSliderNameStr)
+  {
+    Create(parent, id, value, min_value, max_value, pos, size, style, validator, name);
+  }
+
+  DolphinSlider& operator=(const DolphinSlider&) = delete;
+
+  bool Create(wxWindow* parent, wxWindowID id, int value, int min_value, int max_value,
+              const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
+              long style = wxSL_HORIZONTAL, const wxValidator& validator = wxDefaultValidator,
+              const wxString& name = wxSliderNameStr);
+
+#ifdef __WXMSW__
+  // For WM_THEMECHANGED to regenerate metrics
+  WXLRESULT MSWWindowProc(WXUINT msg, WXWPARAM wp, WXLPARAM lp) override;
+#endif
+
+protected:
+  // DoGetBestSize() in wxMSW::wxSlider is borked.
+  // This is called by GetEffectiveMinSize() which is used by
+  // wxSizers to decide the size of the widget for generating layout.
+  wxSize DoGetBestClientSize() const override;
+
+  // GTK Themes sometimes don't provide a default min size.
+  // Make other platforms consistent with Windows (i.e. min length = 100px)
+  wxSize DoGetBestSize() const override;
+
+private:
+  wxSize CorrectMinSize(wxSize size) const;
+};