问题
is there a way to add a drop shadow to controls?
are there any controls out there with this feature?
回答1:
This question has been around for 6 years and needs an answer. I hope that anyone who needs to do this can extrapolate an answer for any control set from my solution. I had a panel and wanted to draw a drop shadow underneath every child control - in this instance one or more panels (but the solution should hold good for other control types with some minor code changes).
As the drop shadow for a control has to be drawn on the surface of that control's container we start by adding a function to the container's Paint() event.
Container.Paint += dropShadow;
dropShadow() looks like this:
private void dropShadow(object sender, PaintEventArgs e)
{
Panel panel = (Panel)sender;
Color[] shadow = new Color[3];
shadow[0] = Color.FromArgb(181, 181, 181);
shadow[1] = Color.FromArgb(195, 195, 195);
shadow[2] = Color.FromArgb(211, 211, 211);
Pen pen = new Pen(shadow[0]);
using (pen)
{
foreach (Panel p in panel.Controls.OfType<Panel>())
{
Point pt = p.Location;
pt.Y += p.Height;
for (var sp = 0; sp < 3; sp++)
{
pen.Color = shadow[sp];
e.Graphics.DrawLine(pen, pt.X, pt.Y, pt.X + p.Width - 1, pt.Y);
pt.Y++;
}
}
}
}
Clearly you can pick a different control type from the container's collection and you can vary the colour and depth of the shadow with some minor tweaks.
回答2:
You have to overwrite the CreateParams
property like this:
private const int CS_DROPSHADOW = 0x00020000;
protected override CreateParams CreateParams
{
get
{
// add the drop shadow flag for automatically drawing
// a drop shadow around the form
CreateParams cp = base.CreateParams;
cp.ClassStyle |= CS_DROPSHADOW;
return cp;
}
}
回答3:
There is in WPF if you can stretch to using that instead, I don't believe there is an alternative in Windows Forms due to the limited capabilities of GDI+.
来源:https://stackoverflow.com/questions/2463519/drop-shadow-in-winforms-controls