最近,我的 win 表单应用程序需要一个垂直进度条。派生类如下所示。我还需要在进度条上添加文本。由于透明度问题,它上面的标签不起作用。经过一番研究,我发现了一些东西。但问题是,虽然进度条是垂直的,但它上面的文本却是水平的。我也需要垂直的。我怎样才能做到这一点?
谢谢。
public class VProgressBar : ProgressBar
{
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.Style |= 0x04;
if (Environment.OSVersion.Platform == PlatformID.Win32NT && Environment.OSVersion.Version.Major >= 6)
{
cp.ExStyle |= 0x02000000; // WS_EX_COMPOSITED
}
return cp;
}
}
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == 0x000F)
{
using (Graphics graphics = CreateGraphics())
using (SolidBrush brush = new SolidBrush(ForeColor))
{
SizeF textSize = graphics.MeasureString(Text, Font);
graphics.DrawString(Text, Font, brush, (Width - textSize.Width) / 2, (Height - textSize.Height) / 2);
}
}
}
[EditorBrowsable(EditorBrowsableState.Always)]
[Browsable(true)]
public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
Refresh();
}
}
[EditorBrowsable(EditorBrowsableState.Always)]
[Browsable(true)]
public override Font Font
{
get
{
return base.Font;
}
set
{
base.Font = value;
Refresh();
}
}
}