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Implemented CsWin32.
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Implemented the CsWin32 library to have PInvoke declarations automatically generated.
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@pvginkel
pvginkel committed Jan 8, 2024
1 parent e78065f commit c6cde5c
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Showing 36 changed files with 516 additions and 1,708 deletions.
333 changes: 40 additions & 293 deletions src/Tql.App/Interop/Dwm.cs
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Original file line number Diff line number Diff line change
@@ -1,149 +1,51 @@
// From https://stackoverflow.com/questions/51578104/how-to-create-a-semi-transparent-or-blurred-backcolor-in-a-windows-form

using System.Drawing;
using System.Runtime.InteropServices;
using System.Security;
using Tql.App.Support;
using Windows.Win32.Graphics.Dwm;

// ReSharper disable UnusedMember.Local
// ReSharper disable UnusedMember.Global
// ReSharper disable InconsistentNaming

namespace Tql.App.Interop;

// These declarations cannot be generated by CsWin32 because they're undocumented.

[SuppressUnmanagedCodeSecurity]
public class Dwm
internal static class Dwm
{
public const int WM_DWMCOMPOSITIONCHANGED = 0x031E;

public struct MARGINS(int LeftWidth, int RightWidth, int TopHeight, int BottomHeight)
{
public int leftWidth = LeftWidth;
public int rightWidth = RightWidth;
public int topHeight = TopHeight;
public int bottomHeight = BottomHeight;

public void NoMargins()
{
leftWidth = 0;
rightWidth = 0;
topHeight = 0;
bottomHeight = 0;
}

public void SheetOfGlass()
{
leftWidth = -1;
rightWidth = -1;
topHeight = -1;
bottomHeight = -1;
}
}

[Flags]
public enum DWM_BB
{
Enable = 1,
BlurRegion = 2,
TransitionOnMaximized = 4
}

// https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
public enum DWMWINDOWATTRIBUTE : uint
{
NCRenderingEnabled = 1, //Get atttribute
NCRenderingPolicy, //Enable or disable non-client rendering
TransitionsForceDisabled,
AllowNCPaint,
CaptionButtonBounds, //Get atttribute
NonClientRtlLayout,
ForceIconicRepresentation,
Flip3DPolicy,
ExtendedFrameBounds, //Get atttribute
HasIconicBitmap,
DisallowPeek,
ExcludedFromPeek,
Cloak,
Cloaked, //Get atttribute. Returns a DWMCLOACKEDREASON
FreezeRepresentation,
PassiveUpdateMode,
UseHostBackDropBrush,
AccentPolicy = 19, // Win 10 (undocumented)
ImmersiveDarkMode = 20, // Win 11 22000
WindowCornerPreference = 33, // Win 11 22000
BorderColor, // Win 11 22000
CaptionColor, // Win 11 22000
TextColor, // Win 11 22000
VisibleFrameBorderThickness, // Win 11 22000
SystemBackdropType // Win 11 22621
}

public enum DWMCLOACKEDREASON : uint
{
DWM_CLOAKED_APP = 0x0000001, //cloaked by its owner application.
DWM_CLOAKED_SHELL = 0x0000002, //cloaked by the Shell.
DWM_CLOAKED_INHERITED = 0x0000004 //inherited from its owner window.
}

public enum DWMNCRENDERINGPOLICY : uint
{
UseWindowStyle, // Enable/disable non-client rendering based on window style
Disabled, // Disabled non-client rendering; window style is ignored
Enabled, // Enabled non-client rendering; window style is ignored
};
// Undocumented.
private const DWMWINDOWATTRIBUTE DWMWA_ACCENT_POLICY = (DWMWINDOWATTRIBUTE)19;

public enum DWMACCENTSTATE
{
ACCENT_DISABLED = 0,
ACCENT_ENABLE_GRADIENT = 1,
ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
ACCENT_ENABLE_BLURBEHIND = 3,
ACCENT_ENABLE_ACRYLICBLURBEHIND = 4
DWMAS_DISABLED = 0,
DWMAS_ENABLE_GRADIENT = 1,
DWMAS_ENABLE_TRANSPARENTGRADIENT = 2,
DWMAS_ENABLE_BLURBEHIND = 3,
DWMAS_ENABLE_ACRYLICBLURBEHIND = 4
}

public enum DWMACCENTFLAGS
{
DrawLeftBorder = 0x20,
DrawTopBorder = 0x40,
DrawRightBorder = 0x80,
DrawBottomBorder = 0x100,
DrawAllBorders = (DrawLeftBorder | DrawTopBorder | DrawRightBorder | DrawBottomBorder)
};

[Flags]
public enum CompositionAction : uint
{
DWM_EC_DISABLECOMPOSITION = 0,
DWM_EC_ENABLECOMPOSITION = 1
}

// Values designating how Flip3D treats a given window.
public enum DWMFLIP3DWINDOWPOLICY : uint
public enum DWMACCENTFLAGS
{
Default, // Hide or include the window in Flip3D based on window style and visibility.
ExcludeBelow, // Display the window under Flip3D and disabled.
ExcludeAbove, // Display the window above Flip3D and enabled.
DWMAF_DRAW_LEFT_BORDER = 0x20,
DWMAF_DRAW_TOP_BORDER = 0x40,
DWMAF_DRAW_RIGHT_BORDER = 0x80,
DWMAF_DRAW_BOTTOM_BORDER = 0x100,
DWMAF_DRAW_ALL_BORDERS =
(
DWMAF_DRAW_LEFT_BORDER
| DWMAF_DRAW_TOP_BORDER
| DWMAF_DRAW_RIGHT_BORDER
| DWMAF_DRAW_BOTTOM_BORDER
)
};

public enum ThumbProperties_dwFlags : uint
{
RectDestination = 0x00000001,
RectSource = 0x00000002,
Opacity = 0x00000004,
Visible = 0x00000008,
SourceClientAreaOnly = 0x00000010
}

public enum DWM_WINDOW_CORNER_PREFERENCE
{
DWMWCP_DEFAULT = 0,
DWMWCP_DONOTROUND = 1,
DWMWCP_ROUND = 2,
DWMWCP_ROUNDSMALL = 3
}

[StructLayout(LayoutKind.Sequential)]
public struct AccentPolicy(
public struct ACCENT_POLICY(
DWMACCENTSTATE accentState,
DWMACCENTFLAGS accentFlags,
int gradientColor,
Expand All @@ -157,134 +59,15 @@ int animationId
}

[StructLayout(LayoutKind.Sequential)]
public struct DWM_BLURBEHIND(bool enabled)
{
public DWM_BB dwFlags = DWM_BB.Enable;
public int fEnable = (enabled) ? 1 : 0;
public IntPtr hRgnBlur = IntPtr.Zero;
public int fTransitionOnMaximized = 0;

public Region Region => Region.FromHrgn(hRgnBlur);

public bool TransitionOnMaximized
{
get => fTransitionOnMaximized > 0;
set
{
fTransitionOnMaximized = (value) ? 1 : 0;
dwFlags |= DWM_BB.TransitionOnMaximized;
}
}

public void SetRegion(Graphics graphics, Region region)
{
hRgnBlur = region.GetHrgn(graphics);
dwFlags |= DWM_BB.BlurRegion;
}
}

[StructLayout(LayoutKind.Sequential)]
public struct WinCompositionAttrData(DWMWINDOWATTRIBUTE attribute, IntPtr data, int sizeOfData)
{
public DWMWINDOWATTRIBUTE Attribute = attribute;
public IntPtr Data = data; //Will point to an AccentPolicy struct, where Attribute will be DWMWINDOWATTRIBUTE.AccentPolicy
public int SizeOfData = sizeOfData;
}

[StructLayout(LayoutKind.Sequential)]
public struct COLORREF
{
public byte R;
public byte G;
public byte B;
}

private static int GetBlurBehindPolicyAccentFlags()
{
int drawLeftBorder = 20;
int drawTopBorder = 40;
int drawRightBorder = 80;
int drawBottomBorder = 100;
return (drawLeftBorder | drawTopBorder | drawRightBorder | drawBottomBorder);
}

//https://msdn.microsoft.com/en-us/library/windows/desktop/aa969508(v=vs.85).aspx
[DllImport("dwmapi.dll")]
internal static extern int DwmEnableBlurBehindWindow(
IntPtr hwnd,
ref DWM_BLURBEHIND blurBehind
);

[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmEnableComposition(CompositionAction uCompositionAction);

//https://msdn.microsoft.com/it-it/library/windows/desktop/aa969512(v=vs.85).aspx
[DllImport("dwmapi.dll")]
internal static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);

//https://msdn.microsoft.com/en-us/library/windows/desktop/aa969515(v=vs.85).aspx
[DllImport("dwmapi.dll")]
internal static extern int DwmGetWindowAttribute(
IntPtr hwnd,
DWMWINDOWATTRIBUTE attr,
ref int attrValue,
int attrSize
);

//https://msdn.microsoft.com/en-us/library/windows/desktop/aa969524(v=vs.85).aspx
[DllImport("dwmapi.dll")]
internal static extern int DwmSetWindowAttribute(
IntPtr hwnd,
DWMWINDOWATTRIBUTE attr,
ref int attrValue,
int attrSize
);

//https://msdn.microsoft.com/en-us/library/windows/desktop/aa969524(v=vs.85).aspx
[DllImport("dwmapi.dll")]
internal static extern int DwmSetWindowAttribute(
IntPtr hwnd,
DWMWINDOWATTRIBUTE attr,
ref COLORREF attrValue,
int attrSize
);

[DllImport("User32.dll", SetLastError = true)]
internal static extern int SetWindowCompositionAttribute(
IntPtr hwnd,
ref WinCompositionAttrData data
);

[DllImport("dwmapi.dll")]
internal static extern int DwmIsCompositionEnabled(ref int pfEnabled);

public static bool IsCompositionEnabled()
{
int pfEnabled = 0;
DwmIsCompositionEnabled(ref pfEnabled);
return pfEnabled == 1;
}

public static bool IsNonClientRenderingEnabled(IntPtr hWnd)
{
int gwaEnabled = 0;
DwmGetWindowAttribute(
hWnd,
DWMWINDOWATTRIBUTE.NCRenderingEnabled,
ref gwaEnabled,
sizeof(int)
);
return gwaEnabled == 1;
}

public static bool WindowSetAttribute(
IntPtr hWnd,
public struct WIN_COMPOSITION_ATTR_DATA(
DWMWINDOWATTRIBUTE attribute,
int attributeValue
IntPtr data,
int sizeOfData
)
{
int result = DwmSetWindowAttribute(hWnd, attribute, ref attributeValue, sizeof(int));
return (result == 0);
public DWMWINDOWATTRIBUTE Attribute = attribute;
public IntPtr Data = data; // Will point to an AccentPolicy struct, where Attribute will be DWMWINDOWATTRIBUTE.AccentPolicy
public int SizeOfData = sizeOfData;
}

public static void Windows10EnableBlurBehind(IntPtr hWnd)
Expand All @@ -293,64 +76,28 @@ public static void Windows10EnableBlurBehind(IntPtr hWnd)
Environment.OSVersion.Version.CompareTo(OSVersions.Windows10_April2018_CreatorsUpdate)
>= 0;

var accPolicy = new AccentPolicy
var accPolicy = new ACCENT_POLICY
{
AccentState = isCreatorsUpdate
? DWMACCENTSTATE.ACCENT_ENABLE_ACRYLICBLURBEHIND
: DWMACCENTSTATE.ACCENT_ENABLE_BLURBEHIND,
AccentFlags = DWMACCENTFLAGS.DrawAllBorders
? DWMACCENTSTATE.DWMAS_ENABLE_ACRYLICBLURBEHIND
: DWMACCENTSTATE.DWMAS_ENABLE_BLURBEHIND,
AccentFlags = DWMACCENTFLAGS.DWMAF_DRAW_ALL_BORDERS
};

int accentSize = Marshal.SizeOf(accPolicy);
IntPtr accentPtr = Marshal.AllocHGlobal(accentSize);
Marshal.StructureToPtr(accPolicy, accentPtr, false);

var data = new WinCompositionAttrData(
DWMWINDOWATTRIBUTE.AccentPolicy,
accentPtr,
accentSize
);
var data = new WIN_COMPOSITION_ATTR_DATA(DWMWA_ACCENT_POLICY, accentPtr, accentSize);

SetWindowCompositionAttribute(hWnd, ref data);

Marshal.FreeHGlobal(accentPtr);
}

public static bool WindowExtendIntoClientArea(IntPtr hWnd, MARGINS margins)
{
// Extend frame on the bottom of client area
int result = DwmExtendFrameIntoClientArea(hWnd, ref margins);
return result == 0;
}

public static bool WindowBorderlessDropShadow(IntPtr hWnd, int shadowSize)
{
MARGINS margins = new MARGINS(0, shadowSize, 0, shadowSize);
int result = DwmExtendFrameIntoClientArea(hWnd, ref margins);
return result == 0;
}

public static bool WindowSheetOfGlass(IntPtr hWnd)
{
MARGINS margins = new MARGINS();

//Margins set to All:-1 - Sheet Of Glass effect
margins.SheetOfGlass();
int result = DwmExtendFrameIntoClientArea(hWnd, ref margins);
return result == 0;
}

public static bool WindowDisableRendering(IntPtr hWnd)
{
int ncrp = (int)DWMNCRENDERINGPOLICY.Disabled;
// Disable non-client area rendering on the window.
int result = DwmSetWindowAttribute(
hWnd,
DWMWINDOWATTRIBUTE.NCRenderingPolicy,
ref ncrp,
sizeof(int)
);
return result == 0;
}
[DllImport("user32", SetLastError = true)]
internal static extern int SetWindowCompositionAttribute(
IntPtr hwnd,
ref WIN_COMPOSITION_ATTR_DATA data
);
}
//DWM
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