[idd] helper/config: implement window positioning, fonts, and high DPI support

idd/LGIddHelper/UIHelpers.h

@@ -0,0 +1,49 @@
+#pragma once
+#include <windows.h>
+
+struct FontTraits
+{
+  typedef HFONT Type;
+  inline static bool Close(Type h) { return DeleteObject(h); }
+  inline static Type GetInvalidValue() { return nullptr; }
+};
+
+class WidgetPositioner
+{
+  HDWP hdwp;
+  double m_scale;
+  DWORD width, height;
+  inline int scale(int value) { return (int)round(value * m_scale); }
+
+public:
+  WidgetPositioner(double scale, DWORD width, DWORD height) :
+    m_scale(scale), width(width), height(height),
+    hdwp(BeginDeferWindowPos(10)) {}
+
+  ~WidgetPositioner() { EndDeferWindowPos(hdwp); }
+
+  void move(HWND child, int x, int y, int cx, int cy)
+  {
+    hdwp = DeferWindowPos(hdwp, child, nullptr, x, y, cx, cy, SWP_NOACTIVATE | SWP_NOZORDER);
+  }
+
+  void pinTopLeft(HWND child, int x, int y, int cx, int cy)
+  {
+    move(child, scale(x), scale(y), scale(cx), scale(cy));
+  }
+
+  void pinTopRight(HWND child, int x, int y, int cx, int cy)
+  {
+    move(child, scale(x), scale(y), width - scale(cx), scale(cy));
+  }
+
+  void pinTopLeftRight(HWND child, int x, int y, int rx, int cy)
+  {
+    move(child, scale(x), scale(y), width - scale(rx + x), scale(cy));
+  }
+
+  void pinLeftTopBottom(HWND child, int x, int y, int cx, int by)
+  {
+    move(child, scale(x), scale(y), cx, height - scale(y + by));
+  }
+};