将文本添加到工具条进度条

Question

我正在尝试将一些文本添加到工具条进度条,但到目前为止我还没有成功,这里是我在这里找到的一些代码:

private void pbPrecentage(ToolStripProgressBar pb)
{
    ProgressBar p = new ProgressBar();

    int percent = (int)(((double)(pb.Value - pb.Minimum) /
    (double)(pb.Maximum - pb.Minimum)) * 100);
    using (Graphics gr = pb.CreateGraphics())
    {
        gr.DrawString(percent.ToString() + "%",
            SystemFonts.DefaultFont,
            Brushes.Black,
            new PointF(pb.Width / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Width / 2.0F),
            pb.Height / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Height / 2.0F)));
    }
}

问题是Tool Strip Progress Bar没有CreateGraphics方法.所以我想知道是否有人能够成功地将文本添加到工具条进度条.

UPDATE

好吧,似乎ToolStripProgressBar有一个进度条属性,后者又有CreateGraphics方法,但现在的问题是文本值闪烁并闪烁,我该如何修复它？这是修改后的代码:

private void pbPrecentage(ToolStripProgressBar pb)
{
    int percent = (int)(((double)(pb.Value - pb.Minimum) /
    (double)(pb.Maximum - pb.Minimum)) * 100);

    using (Graphics gr = pb.ProgressBar.CreateGraphics())
    {
        gr.DrawString(percent.ToString() + "%",
            SystemFonts.DefaultFont,
            Brushes.Black,
            new PointF(pb.Width / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Width / 2.0F),
            pb.Height / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Height / 2.0F)));
    }
}

Answer 1

您遇到了一个关于Windows Forms的非常常见的问题,它基于GDI +.用于绘制控件(以及用户绘图上下文,如图形)的双缓冲的标准设置已关闭.所以只需在表单中添加一些代码:

public Form1()
{
//Activate Double Buffering for all kind of drawing within your form
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);
}

如果您想要另外获得更好的图形,那么您还应该使用SmoothingMode作为绘图上下文:

private void pbPrecentage(ToolStripProgressBar pb)
{
    int percent = (int)(((double)(pb.Value - pb.Minimum) /
    (double)(pb.Maximum - pb.Minimum)) * 100);

    using (Graphics gr = pb.ProgressBar.CreateGraphics())
    {
        //Switch to Antialiased drawing for better (smoother) graphic results
        gr.SmoothingMode = SmoothingMode.AntiAlias;
        gr.DrawString(percent.ToString() + "%",
            SystemFonts.DefaultFont,
            Brushes.Black,
            new PointF(pb.Width / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Width / 2.0F),
            pb.Height / 2 - (gr.MeasureString(percent.ToString() + "%",
                SystemFonts.DefaultFont).Height / 2.0F)));
    }
}