如何让我的面板停止闪烁

Question

你好，我正在尝试制作一个面板，当它悬停在图片上时会显示一些文本，我希望它跟随光标，所以我

System.Windows.Forms.Panel pan = new System.Windows.Forms.Panel();
    public Form1()
    {
        InitializeComponent();
        Product p = new Product();
        p.SetValues();
        this.pictureBox1.Image = (Image)Properties.Resources.ResourceManager.GetObject("pictureName");

    }

    private void pictureBox1_MouseEnter(object sender, EventArgs e)
    {
        pan.Height = 200;
        pan.Width = 100;
        pan.BackColor = Color.Blue;
        this.Controls.Add(pan);
        pan.BringToFront();
        //pan.Location = PointToClient(Cursor.Position);
    }

    private void pictureBox1_MouseLeave(object sender, EventArgs e)
    {
        Controls.Remove(pan);
    }

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        pan.Location = PointToClient(Cursor.Position);  
    }

我尝试添加 this.doublebuffered = true; 但是当我移动鼠标时它看起来像是面板的残像

当我将鼠标悬停在我的图片上时，它会显示面板，但它会疯狂闪烁这是正常现象还是有解决办法或者这是我的电脑问题

Answer 1

将 this.DoubleDuffered = true; 添加到 Form 只会影响 Form，不会影响 Panel。

所以使用双缓冲 Panel subclass:

class DrawPanel : Panel
{
    public DrawPanel ()
    {
      this.DoubleBuffered = true;
    }
}

然而，四处移动大件物品会造成伤害。顺便说一句，PictureBox class 已经是双缓冲的。此外，将面板添加到 PictureBox 似乎更合乎逻辑，而不是表单：pictureBox1.Controls.Add(pan); 并将 pictureBox1.Refresh(); 添加到 MouseMove.

Update：因为你不在Panel上画画，还需要它与PictureBox重叠，所以上面的想法并不适用；使用 subclass 不是必需的，尽管它在某些时候可能会派上用场。是的，需要将面板添加到窗体的控件集合中！

这段代码在这里工作得很好：

public Form1()
{
    InitializeComponent();

    // your other init code here

    Controls.Add(pan);  // add only once
    pan.BringToFront();
    pan.Hide();         // and hide or show
    this.DoubleDuffered = true  // !!
}

private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
    pan.Hide();         // hide or show
}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    pan.Location = pictureBox1.PointToClient(Cursor.Position);
    pictureBox1.Refresh();  // !!
    Refresh();              // !!
}

private void pictureBox1_MouseEnter(object sender, EventArgs e)
{
    pan.Height = 200;
    pan.Width = 100;
    pan.BackColor = Color.Blue;
    pan.Location = pictureBox1.PointToClient(Cursor.Position);
    pan.Show();        // and hide or show
}

看起来你错过了 doublebuffering Form 和 refreshing 的正确组合， Form 和 PictureBox.

如何让我的面板停止闪烁

How to make my panel stop flickering

c#

panel

windows-forms-designer