reapack

commit 759201bbcd1eb9f44bb9cb2a691dadeef008d1b1
parent 29992f4df28f0d6c5b52027dd173c5446ce9d054
Author: cfillion <cfillion@users.noreply.github.com>
Date:   Sun, 23 Feb 2020 20:58:21 -0800

about: preserve formatting when DPI changes in Per-Monitor v2 mode

Diffstat:
A
src/dllimport.hpp
 | 
54
++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
src/richedit-win32.cpp
 | 
11
+++++++++++

2 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/src/dllimport.hpp b/src/dllimport.hpp
@@ -0,0 +1,54 @@
+/* ReaPack: Package manager for REAPER
+ * Copyright (C) 2015-2020  Christian Fillion
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef REAPACK_DLLIMPORT_HPP
+#define REAPACK_DLLIMPORT_HPP
+
+#ifndef _WIN32
+#  error This file should not be included on non-Windows systems.
+#endif
+
+#include <windows.h>
+
+template<typename Proc, typename = std::enable_if_t<std::is_function_v<Proc>>>
+class DllImport {
+public:
+  DllImport(const wchar_t *dll, const char *func)
+  {
+    if (m_lib = LoadLibrary(dll))
+      m_proc = reinterpret_cast<Proc *>(GetProcAddress(m_lib, func));
+    else
+      m_proc = nullptr;
+  }
+
+  ~DllImport()
+  {
+    if (m_lib)
+      FreeLibrary(m_lib);
+  }
+
+  operator bool() const { return m_proc != nullptr; }
+
+  template<typename... Args>
+  auto operator()(Args&&... args) const { return m_proc(std::forward<Args>(args)...); }
+
+private:
+  HINSTANCE m_lib;
+  Proc *m_proc;
+};
+
+#endif
diff --git a/src/richedit-win32.cpp b/src/richedit-win32.cpp
@@ -20,6 +20,7 @@
 // This is the Win32 implementation of RichEdit
 // The macOS implementation is in richedit.mm, Linux is in richedit-generic.cpp
 
+#include "dllimport.hpp"
 #include "win32.hpp"
 
 #include <memory>
@@ -51,6 +52,16 @@ RichEdit::RichEdit(HWND handle)
   SendMessage(handle, EM_SETEVENTMASK, 0, ENM_LINK);
   SendMessage(handle, EM_SETEDITSTYLE,
     SES_HYPERLINKTOOLTIPS, SES_HYPERLINKTOOLTIPS);
+
+  // available since Windows 10 version 1703
+  static DllImport<decltype(SetDialogControlDpiChangeBehavior)>
+    _SetDialogControlDpiChangeBehavior
+    {L"user32.dll", "SetDialogControlDpiChangeBehavior"};
+
+  if(_SetDialogControlDpiChangeBehavior) {
+    _SetDialogControlDpiChangeBehavior(handle,
+      DCDC_DISABLE_FONT_UPDATE, DCDC_DISABLE_FONT_UPDATE);
+  }
 }
 
 RichEdit::~RichEdit() = default;