Merge pull request #717 from everettraven/Windows-10-DPI-process-fix

Implemented DPI process bug fix

src/winforms/toga_winforms/app.py

@@ -2,7 +2,7 @@
 
 import toga
 
-from .libs import Threading, WinForms, add_handler, user32, win_version
+from .libs import Threading, WinForms, add_handler, user32, win_version, shcore
 from .window import Window
 
 
@@ -21,8 +21,24 @@ def __init__(self, interface):
     def create(self):
         self.native = WinForms.Application
 
-        if win_version >= 6:
-            user32.SetProcessDPIAware(True)
+        # Check the version of windows and make sure we are setting the DPI mode
+        # with the most up to date API
+        # Windows Versioning Check Sources : https://www.lifewire.com/windows-version-numbers-2625171
+        # and https://docs.microsoft.com/en-us/windows/release-information/
+        if win_version.Major >= 6:  # Checks for Windows Vista or later
+            # Represents Windows 8.1 up to Windows 10 before Build 1703 which should use
+            # SetProcessDpiAwareness(True)
+            if ((win_version.Major == 6 and win_version.Minor == 3) or
+                    (win_version.Major == 10 and win_version.Build < 15063)):
+                shcore.SetProcessDpiAwareness(True)
+            # Represents Windows 10 Build 1703 and beyond which should use
+            # SetProcessDpiAwarenessContext(-2)
+            elif win_version.Major == 10 and win_version.Build >= 15063:
+                user32.SetProcessDpiAwarenessContext(-2)
+            # Any other version of windows should use SetProcessDPIAware(True)
+            else:
+                user32.SetProcessDPIAware(True)
+
         self.native.EnableVisualStyles()
         self.native.SetCompatibleTextRenderingDefault(False)
 

src/winforms/toga_winforms/libs.py

@@ -31,7 +31,8 @@
 )  # noqa: E402
 
 user32 = ctypes.windll.user32
-win_version = Environment.OSVersion.Version.Major
+shcore = ctypes.windll.shcore
+win_version = Environment.OSVersion.Version
 
 
 def TextAlignment(value):