与模糊背景C＃对话框的形式 [英] C# dialog form with blur background

问题描述

下午好，

只是一个简单的问题。有没有可能当你表现出的WinForms一个新的对话形式，使一个父窗体模糊？如果它是不可能在默认情况下，有什么解决方法？这里是我想要的存档只是一个样本图片：

Just a simple question. Is it possible to make a parent form blurry while you show a new dialog form in winforms? if it's not possible by default, are there any workarounds? here is just a sample picture of what I want to archive:

推荐答案

我不认为这是可能的，但我发现了一个类似的问题在这里： 层效果（模糊等）的WinForms

I didn't think this was possible but I found a similar question here: Layer effects (blur, etc.) in WinForms

在code是一个答案在那里，但我已经略有改变它......你需要与不安全编译（请参阅构建项目的属性选项卡（允许不安全code） ）。

The code is from an answer over there but I've changed it slightly... You'll need to compile with the unsafe on (see build tab of your project's properties (Allow unsafe code)).

Basicly你把一切都在你的形式在面板（称为PANEL1在code）和调用模糊功能。我还添加了一个unblur功能回到正常的：

Basicly you put everything in your form in a panel (called panel1 in the code) and call the blur function. I also added an unblur function to go back to normal:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private PictureBox pb;

        public Form1()
        {
            InitializeComponent();

            pb = new PictureBox();
            panel1.Controls.Add(pb);
            pb.Dock = DockStyle.Fill;
        }

        private void Blur()
        {
            Bitmap bmp = Screenshot.TakeSnapshot(panel1);
            BitmapFilter.GaussianBlur(bmp, 4);

            pb.Image = bmp;
            pb.BringToFront();
        }

        private void UnBlur()
        {
            pb.Image = null;
            pb.SendToBack();
        }
    }

    public class BitmapFilter
    {
        private static bool Conv3x3(Bitmap b, ConvMatrix m)
        {
            // Avoid divide by zero errors
            if (0 == m.Factor) return false;

            Bitmap bSrc = (Bitmap)b.Clone();

            // GDI+ still lies to us - the return format is BGR, NOT RGB.
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            BitmapData bmSrc = bSrc.LockBits(new Rectangle(0, 0, bSrc.Width, bSrc.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            int stride = bmData.Stride;
            int stride2 = stride * 2;
            System.IntPtr Scan0 = bmData.Scan0;
            System.IntPtr SrcScan0 = bmSrc.Scan0;

            unsafe
            {
                byte* p = (byte*)(void*)Scan0;
                byte* pSrc = (byte*)(void*)SrcScan0;

                int nOffset = stride + 6 - b.Width * 3;
                int nWidth = b.Width - 2;
                int nHeight = b.Height - 2;

                int nPixel;

                for (int y = 0; y < nHeight; ++y)
                {
                    for (int x = 0; x < nWidth; ++x)
                    {
                        nPixel = ((((pSrc[2] * m.TopLeft) + (pSrc[5] * m.TopMid) + (pSrc[8] * m.TopRight) +
                            (pSrc[2 + stride] * m.MidLeft) + (pSrc[5 + stride] * m.Pixel) + (pSrc[8 + stride] * m.MidRight) +
                            (pSrc[2 + stride2] * m.BottomLeft) + (pSrc[5 + stride2] * m.BottomMid) + (pSrc[8 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[5 + stride] = (byte)nPixel;

                        nPixel = ((((pSrc[1] * m.TopLeft) + (pSrc[4] * m.TopMid) + (pSrc[7] * m.TopRight) +
                            (pSrc[1 + stride] * m.MidLeft) + (pSrc[4 + stride] * m.Pixel) + (pSrc[7 + stride] * m.MidRight) +
                            (pSrc[1 + stride2] * m.BottomLeft) + (pSrc[4 + stride2] * m.BottomMid) + (pSrc[7 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[4 + stride] = (byte)nPixel;

                        nPixel = ((((pSrc[0] * m.TopLeft) + (pSrc[3] * m.TopMid) + (pSrc[6] * m.TopRight) +
                            (pSrc[0 + stride] * m.MidLeft) + (pSrc[3 + stride] * m.Pixel) + (pSrc[6 + stride] * m.MidRight) +
                            (pSrc[0 + stride2] * m.BottomLeft) + (pSrc[3 + stride2] * m.BottomMid) + (pSrc[6 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[3 + stride] = (byte)nPixel;

                        p += 3;
                        pSrc += 3;
                    }

                    p += nOffset;
                    pSrc += nOffset;
                }
            }

            b.UnlockBits(bmData);
            bSrc.UnlockBits(bmSrc);

            return true;
        }

        public static bool GaussianBlur(Bitmap b, int nWeight /* default to 4*/)
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(1);
            m.Pixel = nWeight;
            m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 2;
            m.Factor = nWeight + 12;

            return BitmapFilter.Conv3x3(b, m);
        }

        public class ConvMatrix
        {
            public int TopLeft = 0, TopMid = 0, TopRight = 0;
            public int MidLeft = 0, Pixel = 1, MidRight = 0;
            public int BottomLeft = 0, BottomMid = 0, BottomRight = 0;
            public int Factor = 1;
            public int Offset = 0;
            public void SetAll(int nVal)
            {
                TopLeft = TopMid = TopRight = MidLeft = Pixel = MidRight = BottomLeft = BottomMid = BottomRight = nVal;
            }
        }
    }

    class Screenshot
    {
        public static Bitmap TakeSnapshot(Control ctl) 
        { 
            Bitmap bmp = new Bitmap(ctl.Size.Width, ctl.Size.Height);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp); 
            g.CopyFromScreen(ctl.PointToScreen(ctl.ClientRectangle.Location), new Point(0, 0), ctl.ClientRectangle.Size); 
            return bmp; 
        }
    }
}

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