public static DPI_AWARENESS GetProcessDpiAwareness()
{
DPI_AWARENESS result = DPI_AWARENESS.DPI_AWARENESS_INVALID;
IntPtr pid = Process.GetCurrentProcess().Handle;
try
{
_GetProcessDpiAwareness(pid, out result);
}
catch (Exception)
{
}
return(result);
}
/*
* // Dpi awareness context values. Matching windows values.
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_UNAWARE = (-1);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_SYSTEM_AWARE = (-2);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE = (-3);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 = (-4);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_UNSPECIFIED = (0);*/
internal static DpiAwarenessContext GetDpiAwarenessContextForWindow(IntPtr hWnd)
{
DpiAwarenessContext dpiAwarenessContext = DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNSPECIFIED;
if (OsVersion.IsWindows10_1607OrGreater)
{
// Works only >= Windows 10/1607
IntPtr awarenessContext = GetWindowDpiAwarenessContext(hWnd);
DPI_AWARENESS awareness = GetAwarenessFromDpiAwarenessContext(awarenessContext);
dpiAwarenessContext = ConvertToDpiAwarenessContext(awareness);
}
return(dpiAwarenessContext);
}
/*
* // Dpi awareness context values. Matching windows values.
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_UNAWARE = (-1);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_SYSTEM_AWARE = (-2);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE = (-3);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 = (-4);
* public static readonly DPI_AWARENESS_CONTEXT DPI_AWARENESS_CONTEXT_UNSPECIFIED = (0);*/
internal static DpiAwarenessContext GetDpiAwarenessContextForWindow(IntPtr hWnd)
{
DpiAwarenessContext dpiAwarenessContext = DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNSPECIFIED;
if (ApiHelper.IsApiAvailable(ExternDll.User32, "GetWindowDpiAwarenessContext") &&
ApiHelper.IsApiAvailable(ExternDll.User32, "GetAwarenessFromDpiAwarenessContext"))
{
// Works only >= Windows 10/1607
IntPtr awarenessContext = GetWindowDpiAwarenessContext(hWnd);
DPI_AWARENESS awareness = GetAwarenessFromDpiAwarenessContext(awarenessContext);
dpiAwarenessContext = ConvertToDpiAwarenessContext(awareness);
}
return(dpiAwarenessContext);
}
private static DpiAwarenessContext ConvertToDpiAwarenessContext(DPI_AWARENESS dpiAwareness)
{
switch (dpiAwareness)
{
case DPI_AWARENESS.DPI_AWARENESS_UNAWARE:
return(DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNAWARE);
case DPI_AWARENESS.DPI_AWARENESS_SYSTEM_AWARE:
return(DpiAwarenessContext.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
case DPI_AWARENESS.DPI_AWARENESS_PER_MONITOR_AWARE:
return(DpiAwarenessContext.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
default:
return(DpiAwarenessContext.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
}
}
protected override void WndProc(ref Message message)
{
if (this.IsHandleCreated == true &&
this.DPIAware == true &&
message.Msg == 0x02E0) // WM_DPICHANGED
{
uint uDpi = 96;
DPI_AWARENESS dpiAwareness = GetAwarenessFromDpiAwarenessContext(GetThreadDpiAwarenessContext());
switch (dpiAwareness)
{
case DPI_AWARENESS.SystemAware:
uDpi = GetDpiForSystem();
break;
case DPI_AWARENESS.PerMonitorAware:
uDpi = GetDpiForWindow(this.Handle);
break;
}
this.Font = new Font(this.Font.FontFamily, ((float)uDpi / PreviousDPI) * this.Font.Size, this.Font.Style);
// incompleted
foreach (var control in this.Controls)
{
if (control is Label)
{
var ctrl = control as Control;
if (ctrl.Font != null)
{
ctrl.Font = new Font(ctrl.Font.FontFamily, ((float)uDpi / PreviousDPI) * ctrl.Font.Size, ctrl.Font.Style);
}
}
}
// save previous dpi
PreviousDPI = uDpi;
return;
}
base.WndProc(ref message);
}
internal static System.Windows.Forms.DpiAwarenessContext TryGetDpiAwarenessContextForWindow(IntPtr hWnd)
{
System.Windows.Forms.DpiAwarenessContext result = System.Windows.Forms.DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNSPECIFIED;
try
{
if (ApiHelper.IsApiAvailable("user32.dll", "GetWindowDpiAwarenessContext"))
{
if (ApiHelper.IsApiAvailable("user32.dll", "GetAwarenessFromDpiAwarenessContext"))
{
IntPtr windowDpiAwarenessContext = GetWindowDpiAwarenessContext(hWnd);
DPI_AWARENESS awarenessFromDpiAwarenessContext = GetAwarenessFromDpiAwarenessContext(windowDpiAwarenessContext);
result = ConvertToDpiAwarenessContext(awarenessFromDpiAwarenessContext);
return(result);
}
return(result);
}
return(result);
}
catch
{
return(result);
}
}
private static extern IntPtr _SetProcessDpiAwareness(DPI_AWARENESS awareness);
public static IntPtr SetProcessDpiAwareness(DPI_AWARENESS awareness)
{
return(_SetProcessDpiAwareness(awareness));
}
private static extern void _GetProcessDpiAwareness(IntPtr hprocess, out DPI_AWARENESS awareness);
private static System.Windows.Forms.DpiAwarenessContext ConvertToDpiAwarenessContext(DPI_AWARENESS dpiAwareness)
{
return(dpiAwareness switch
{
DPI_AWARENESS.DPI_AWARENESS_UNAWARE => System.Windows.Forms.DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNAWARE,
DPI_AWARENESS.DPI_AWARENESS_SYSTEM_AWARE => System.Windows.Forms.DpiAwarenessContext.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE,
DPI_AWARENESS.DPI_AWARENESS_PER_MONITOR_AWARE => System.Windows.Forms.DpiAwarenessContext.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2,
_ => System.Windows.Forms.DpiAwarenessContext.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE,
});
internal static extern bool SetProcessDpiAwareness(DPI_AWARENESS awareness);