c# - BufferedGraphics 闪烁

Question

我试图实现自定义双缓冲，但它会导致闪烁。

这是控件（从控件继承的自定义控件）构造函数中的代码：

bufferContext = new BufferedGraphicsContext();
SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
SetStyle(ControlStyles.DoubleBuffer, false);
SetStyle(ControlStyles.ResizeRedraw, false);
SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
SetStyle(ControlStyles.Opaque, true);

OnPaint 事件：

protected override void OnPaint(PaintEventArgs e)
{
    if (buffer == null)
    {
        Draw(e);
        return;
    }

    if (Repaint)
    {
        Repaint = false;
        PaintEventArgs pe = new PaintEventArgs(buffer.Graphics, e.ClipRectangle);
        Draw(pe);
    }

    buffer.Render(e.Graphics);
}

此外，在调整与缓冲相关的大小时会激活此代码：

Graphics g = this.CreateGraphics();

if (buffer != null)
{
    buffer.Dispose();
    buffer = null;
}

if (!(bufferContext == null || DisplayRectangle.Width <= 0 || DisplayRectangle.Height <= 0))
{
    buffer = bufferContext.Allocate(g, DisplayRectangle);
    Repaint = true;
}

Draw 方法比较复杂，但它首先用 BackColor 填充控件，其他无关紧要。

我有时可以用眼睛发现闪烁，主要是在调整窗口大小时。据我所知，黑色首先在控件上绘制，然后是缓冲区中的图形，它会导致闪烁。但是，BackColor 绝不是黑色。

该怎么做才能阻止这种情况？

Answer 1

这个例子展示了如何正确使用缓冲图形：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GDI_PAINTING_EXAMPLE
{
    public class PaintingExample : Control
    {
        public Graphics G;
        public Bitmap Frame = new Bitmap(256, 256);
        public Bitmap Buffer = new Bitmap(256, 256);

        public PaintingExample()
        {
            // Create a new Graphics instance.
            G = Graphics.FromImage(Buffer);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            // Clears Buffer To White
            G.Clear(Color.White);



            //
            // Do Your Painting Routine
            //

            //
            // End Your Painting Routine
            //



            // Set Frame to draw as Buffer
            Frame = Buffer;

            // Draw Frame with Paint Event Graphics as one image.
            e.Graphics.DrawImage(Frame, new Point(0, 0));
        }
        protected override void OnPaintBackground(PaintEventArgs pevent)
        {
        }
    }
}