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Fix always-enabled dark mode shadow bug #4685

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Fix always-enabled dark mode shadow bug #4685

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11 changes: 11 additions & 0 deletions ...mplateStudioForWinUICs/Templates/Proj/Default/Param_ProjectName/Helpers/TitleBarHelper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ internal class TitleBarHelper
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);

[DllImport("dwmapi.dll")]
private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);

public static void UpdateTitleBar(ElementTheme theme)
{
if (App.MainWindow.ExtendsContentIntoTitleBar)
Expand Down Expand Up @@ -95,6 +98,14 @@ public static void UpdateTitleBar(ElementTheme theme)
SendMessage(hwnd, WMACTIVATE, WAACTIVE, IntPtr.Zero);
SendMessage(hwnd, WMACTIVATE, WAINACTIVE, IntPtr.Zero);
}

var isDarkModeInt = theme switch
{
ElementTheme.Dark => 1,
ElementTheme.Light => 0,
_ => 0
};
DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE, ref isDarkModeInt, sizeof(int));
}
}

Expand Down