initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/private/window.h

@@ -0,0 +1,100 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/private/window.h
+// Purpose:     misc wxWindow helpers
+// Author:      Vaclav Slavik
+// Created:     2010-01-21
+// Copyright:   (c) 2010 Vaclav Slavik
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_PRIVATE_WINDOW_H_
+#define _WX_PRIVATE_WINDOW_H_
+
+#include "wx/gdicmn.h"
+#include "wx/dynlib.h"
+
+namespace wxPrivate
+{
+
+// Windows' computes dialog units using average character width over upper-
+// and lower-case ASCII alphabet and not using the average character width
+// metadata stored in the font; see
+// http://support.microsoft.com/default.aspx/kb/145994 for detailed discussion.
+//
+// This helper function computes font dimensions in the same way. It works with
+// either wxDC or wxWindow argument.
+template<typename T>
+inline wxSize GetAverageASCIILetterSize(const T& of_what)
+{
+    const wxStringCharType *TEXT_TO_MEASURE =
+        wxS("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
+
+    wxSize s = of_what.GetTextExtent(TEXT_TO_MEASURE);
+    s.x = (s.x / 26 + 1) / 2;
+    return s;
+}
+
+namespace
+{
+
+inline bool SupportsPerMonitorDPI()
+{
+    static bool s_checkDPI =
+#if defined(__WXMSW__)
+        // Only check the DPI when GetDpiForWindow is available because the old
+        // method (GetDeviceCaps) is a lot slower (about 1500 times).
+        // And when GetDpiForWindow is not available (for example older Windows
+        // versions), per-monitor DPI (V2) is also not available.
+        wxLoadedDLL("user32.dll").HasSymbol("GetDpiForWindow");
+#else
+        false;
+#endif
+    return s_checkDPI;
+}
+
+}
+
+template <typename T>
+class DpiDependentValue
+{
+public:
+    // Explicit initialization is needed if T is a primitive type.
+    DpiDependentValue()
+        : m_value(), m_dpi()
+    { }
+
+    bool HasChanged(const wxWindowBase* win)
+    {
+        if ( win && SupportsPerMonitorDPI() )
+        {
+            const wxSize dpi = win->GetDPI();
+            if ( dpi != m_dpi )
+            {
+                m_dpi = dpi;
+                return true;
+            }
+        }
+
+        // Ensure that we return true the first time we're called,
+        // assuming that the value will always be set to a non-default value.
+        return m_value == T();
+    }
+
+    void SetAtNewDPI(const T& value)
+    {
+        m_value = value;
+    }
+
+    T& Get()
+    {
+        return m_value;
+    }
+
+private:
+    T m_value;
+    wxSize m_dpi;
+};
+
+} // namespace wxPrivate
+
+#endif // _WX_PRIVATE_WINDOW_H_