这就是我想要的...
![Windows Form Shadow](https://istack.dev59.com/2uIl8.webp)
(来源: codeproject.com)
在WinForms中,您可以仅覆盖窗体的受保护的CreateParams
属性,并向类样式添加CS_DROPSHADOW
标志。例如:
public class ShadowedForm : Form {
protected override CreateParams CreateParams {
get {
const int CS_DROPSHADOW = 0x20000;
CreateParams cp = base.CreateParams;
cp.ClassStyle |= CS_DROPSHADOW;
return cp;
}
}
// ... other code ...
}
但是,有几个注意事项…
此标志仅适用于顶级窗口,在 Win32 中指重叠和弹出窗口。它对子窗口(例如控件)没有影响。我记得在某个地方听说过这种限制已经从 Windows 8 中删除,但我找不到确认这一点的链接,并且我没有安装用于测试的 Windows 8。
用户可能已经完全禁用了此功能。如果是这样,无论你如何要求,都不会得到阴影效果。这是设计上的考虑。你的应用程序不应该尝试覆盖此请求。你可以通过 P/Invoke SystemParametersInfo
函数并传递 SPI_GETDROPSHADOW
标志来确定是否启用或禁用了投影效果。
Aero 主题还为顶级窗口添加阴影。这个效果与 CS_DROPSHADOW
是分开且独立的,只有在启用 Aero 时才起作用。没有办法为单个窗口关闭或打开此效果。此外,由于 Aero 主题已从 Windows 8 中删除,它将永远不会有这些阴影。
这是我的C#实现。它类似于Al.Petro的,但您会注意到当您失去焦点并重新获取焦点时,阴影会重新绘制。
我还添加了允许鼠标拖动的代码。
public partial class Form1: Form
{
[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
(
int nLeftRect, // x-coordinate of upper-left corner
int nTopRect, // y-coordinate of upper-left corner
int nRightRect, // x-coordinate of lower-right corner
int nBottomRect, // y-coordinate of lower-right corner
int nWidthEllipse, // height of ellipse
int nHeightEllipse // width of ellipse
);
[DllImport("dwmapi.dll")]
public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
[DllImport("dwmapi.dll")]
public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
[DllImport("dwmapi.dll")]
public static extern int DwmIsCompositionEnabled(ref int pfEnabled);
private bool m_aeroEnabled; // variables for box shadow
private const int CS_DROPSHADOW = 0x00020000;
private const int WM_NCPAINT = 0x0085;
private const int WM_ACTIVATEAPP = 0x001C;
public struct MARGINS // struct for box shadow
{
public int leftWidth;
public int rightWidth;
public int topHeight;
public int bottomHeight;
}
private const int WM_NCHITTEST = 0x84; // variables for dragging the form
private const int HTCLIENT = 0x1;
private const int HTCAPTION = 0x2;
protected override CreateParams CreateParams
{
get
{
m_aeroEnabled = CheckAeroEnabled();
CreateParams cp = base.CreateParams;
if (!m_aeroEnabled)
cp.ClassStyle |= CS_DROPSHADOW;
return cp;
}
}
private bool CheckAeroEnabled()
{
if (Environment.OSVersion.Version.Major >= 6)
{
int enabled = 0;
DwmIsCompositionEnabled(ref enabled);
return (enabled == 1) ? true : false;
}
return false;
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_NCPAINT: // box shadow
if (m_aeroEnabled)
{
var v = 2;
DwmSetWindowAttribute(this.Handle, 2, ref v, 4);
MARGINS margins = new MARGINS()
{
bottomHeight = 1,
leftWidth = 1,
rightWidth = 1,
topHeight = 1
};
DwmExtendFrameIntoClientArea(this.Handle, ref margins);
}
break;
default:
break;
}
base.WndProc(ref m);
if (m.Msg == WM_NCHITTEST && (int)m.Result == HTCLIENT) // drag the form
m.Result = (IntPtr)HTCAPTION;
}
public Form1()
{
m_aeroEnabled = false;
this.FormBorderStyle = FormBorderStyle.None;
InitializeComponent();
}
}
CreateParams cp = base.CreateParams;
附近,请问有什么解决方法吗? - Pavel只需复制代码,就可以得到像这样的Windows 7投影效果 >>> http://marcin.floryan.pl/wp-content/uploads/2010/08/WPF-Window-native-shadow.png
Imports System.Runtime.InteropServices
Public Class IMSS_SplashScreen
Private aeroEnabled As Boolean
Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
CheckAeroEnabled()
Dim cp As CreateParams = MyBase.CreateParams
If Not aeroEnabled Then
cp.ClassStyle = cp.ClassStyle Or NativeConstants.CS_DROPSHADOW
Return cp
Else
Return cp
End If
End Get
End Property
Protected Overrides Sub WndProc(ByRef m As Message)
Select Case m.Msg
Case NativeConstants.WM_NCPAINT
Dim val = 2
If aeroEnabled Then
NativeMethods.DwmSetWindowAttribute(Handle, 2, val, 4)
Dim bla As New NativeStructs.MARGINS()
With bla
.bottomHeight = 1
.leftWidth = 1
.rightWidth = 1
.topHeight = 1
End With
NativeMethods.DwmExtendFrameIntoClientArea(Handle, bla)
End If
Exit Select
End Select
MyBase.WndProc(m)
End Sub
Private Sub CheckAeroEnabled()
If Environment.OSVersion.Version.Major >= 6 Then
Dim enabled As Integer = 0
Dim response As Integer = NativeMethods.DwmIsCompositionEnabled(enabled)
aeroEnabled = (enabled = 1)
Else
aeroEnabled = False
End If
End Sub
End Class
Public Class NativeStructs
Public Structure MARGINS
Public leftWidth As Integer
Public rightWidth As Integer
Public topHeight As Integer
Public bottomHeight As Integer
End Structure
End Class
Public Class NativeMethods
<DllImport("dwmapi")> _
Public Shared Function DwmExtendFrameIntoClientArea(ByVal hWnd As IntPtr, ByRef pMarInset As NativeStructs.MARGINS) As Integer
End Function
<DllImport("dwmapi")> _
Friend Shared Function DwmSetWindowAttribute(ByVal hwnd As IntPtr, ByVal attr As Integer, ByRef attrValue As Integer, ByVal attrSize As Integer) As Integer
End Function
<DllImport("dwmapi.dll")> _
Public Shared Function DwmIsCompositionEnabled(ByRef pfEnabled As Integer) As Integer
End Function
End Class
Public Class NativeConstants
Public Const CS_DROPSHADOW As Integer = &H20000
Public Const WM_NCPAINT As Integer = &H85
End Class
我已经在这里回答过了:如何在无边框Winform窗体上添加阴影,且不会出现闪烁或消失
以下是我的答案:
请尝试以下步骤,并在有错误时回复:
将以下代码添加到名为 DropShadow.cs 的新代码文件中;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Core
{
public class DropShadow
{
#region Shadowing
#region Fields
private bool _isAeroEnabled = false;
private bool _isDraggingEnabled = false;
private const int WM_NCHITTEST = 0x84;
private const int WS_MINIMIZEBOX = 0x20000;
private const int HTCLIENT = 0x1;
private const int HTCAPTION = 0x2;
private const int CS_DBLCLKS = 0x8;
private const int CS_DROPSHADOW = 0x00020000;
private const int WM_NCPAINT = 0x0085;
private const int WM_ACTIVATEAPP = 0x001C;
#endregion
#region Structures
[EditorBrowsable(EditorBrowsableState.Never)]
public struct MARGINS
{
public int leftWidth;
public int rightWidth;
public int topHeight;
public int bottomHeight;
}
#endregion
#region Methods
#region Public
[DllImport("dwmapi.dll")]
[EditorBrowsable(EditorBrowsableState.Never)]
public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
[DllImport("dwmapi.dll")]
[EditorBrowsable(EditorBrowsableState.Never)]
public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
[DllImport("dwmapi.dll")]
[EditorBrowsable(EditorBrowsableState.Never)]
public static extern int DwmIsCompositionEnabled(ref int pfEnabled);
[EditorBrowsable(EditorBrowsableState.Never)]
public static bool IsCompositionEnabled()
{
if (Environment.OSVersion.Version.Major < 6) return false;
bool enabled;
DwmIsCompositionEnabled(out enabled);
return enabled;
}
#endregion
#region Private
[DllImport("dwmapi.dll")]
private static extern int DwmIsCompositionEnabled(out bool enabled);
[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
(
int nLeftRect,
int nTopRect,
int nRightRect,
int nBottomRect,
int nWidthEllipse,
int nHeightEllipse
);
private bool CheckIfAeroIsEnabled()
{
if (Environment.OSVersion.Version.Major >= 6)
{
int enabled = 0;
DwmIsCompositionEnabled(ref enabled);
return (enabled == 1) ? true : false;
}
return false;
}
#endregion
#region Overrides
public void ApplyShadows(Form form)
{
var v = 2;
DwmSetWindowAttribute(form.Handle, 2, ref v, 4);
MARGINS margins = new MARGINS()
{
bottomHeight = 1,
leftWidth = 0,
rightWidth = 0,
topHeight = 0
};
DwmExtendFrameIntoClientArea(form.Handle, ref margins);
}
#endregion
#endregion
#endregion
}
}
(new Core.DropShadow()).ApplyShadows(this);
然而,我建议切换到WPF。我自己曾经长期使用WinForms,但是WPF在设计用户界面方面提供了更好的灵活性。您还可以自定义所有控件,而无需任何框架或包。学习WPF需要一些时间,但是这很值得。
BackColor
下不可见,但如果您设置一个深色的 BackColor
,例如 45; 45; 48
,您就可以看到它。有没有什么办法可以纠正这个问题?感谢您的时间!!! - Simos Sigma