Dear George,
Based on my understanding, you're using a ToolBar control(.NET 1.x ), the
ToolBarButton shows an image when it is enabled, but when the ToolBarButton
is disabled, the image is not displayed.
As far as I know this is a by design feature with the old ToolBar
control(.NET 1.x), you can refer to this document:
ToolBarButton.Enable Property
http://msdn.microsoft.com/en-us/library/system.windows.forms.toolbarbutton.e
nabled.aspx
It says:
[MSDN]
If the image or text has multiple colors, they display in a monochromatic
gray.
[/MSDN]
So, if the image you used is colorful, when a ToolBarButton is disabled, a
monochromatic gray would be displayed on it, resulting the disappear of the
image.
For .NET 2.0 and above, there's a new control named "ToolStrip", which can
show a nice gray image when the ToolStripButton is disabled. If you're
working on Visual Studio 2005/2008, I would recommend you use this
ToolStrip control instead.
However, if you're using Visual Studio 2003, you can try my resolution
below to show a gray image on the ToolBarButton when it is disabled,
Sample code for your information:
public class ToolBarEx : ToolBar
{
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == 0x000F) //WM_PAINT
{
foreach (ToolBarButton b in this.Buttons)
{
if (!b.Enabled)
{
using (Graphics g = this.CreateGraphics())
{
Bitmap bmp =
this.GetGrayImage(this.ImageList.Images[b.ImageIndex]);
g.DrawImage(bmp, b.Rectangle.X + 4,
b.Rectangle.Y + 3);
}
}
}
}
}
private Bitmap GetGrayImage(Image ImgSource)
{
Bitmap bmp = new Bitmap(ImgSource.Width, ImgSource.Height);
Bitmap img = ImgSource as Bitmap;
for (int h = 0; h < bmp.Height; h++)
{
for (int w = 0; w < bmp.Width; w++)
{
Color c = img.GetPixel(w, h);
Color newColor = Color.FromArgb(
(int)(0.5 * c.R + 0.3 * c.G + 0.2 * c.B),
(int)(0.5 * c.R + 0.3 * c.G + 0.2 * c.B),
(int)(0.5 * c.R + 0.3 * c.G + 0.2 * c.B));
bmp.SetPixel(w, h, newColor);
}
}
return bmp;
}
}
If anything is unclear, please don't hesitate to let me know. I'm glad to
be of assistance.
Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team
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