Dave,
Well, you are doing quite a bit of work there in the method.
Specifically, I see three brushes (which should have Dispose called on them,
btw) which you are creating each time that method is called. The paint
event can be fired a number of times, so I would recommend that you create
filler, blackbrush, greybrush, etc, etc outside of the paint method, and
then change them when needed (when you change the color in your
preferences). That way, you are not constantly allocating those objects.
You would then dispose those brushes when the appropriate preferences
change, or when the application terminates.
You might also want to cache the StringFormat instance (or better yet,
create it once for the lifetime of your app, since it doesn't seem like it
is dependent on anything in it).
--
- Nicholas Paldino [.NET/C# MVP]
-
mvp@spam.guard.caspershouse.com
"DaveL" <dvs_bis@sbcglobal.netwrote in message
news:7LEQk.2365$%11.898@flpi144.ffdc.sbc.com...
Quote:
when painting the background of a mdi app window
how can i resolve the flicker when it paints
from darker to lighter colors
>
below is the code i wrote
>
>
private void ShellWindow_Gradient(object sender, PaintEventArgs e)
{
>
>
>
Graphics oGraphics = (Graphics)e.Graphics;
//enum i Defined
if (this.StyleType == NetToolsUI.WindowStyle.Solid)
{
>
this.oMdi.BackColor = this.SolidColor; //.RoyalBlue;
//.FromArgb(35,7,143); //.Brushes.AliceBlue;
>
}
else if (this.StyleType == NetToolsUI.WindowStyle.Gradient)
{
Rectangle rect = oMdi.ClientRectangle;
rect.Inflate(2, 2);// to completely fill the client area
>
LinearGradientBrush filler = new LinearGradientBrush(
rect,
this.SolidColor,
this.LightColor,
90,true); //this._angle);
oGraphics.FillRectangle(filler, rect);
>
>
filler.Dispose();
}
//Draw Some Text On the Window
// Create string to draw.
//e.MeasureString(drawString, this.Font);
// Create font and brush.
System.Drawing.SizeF TxtSize = oGraphics.MeasureString(Header,
this.HeaderFont);
SolidBrush GreyBrush = new SolidBrush(this.ShadowColor);
SolidBrush BlackBrush = new SolidBrush(this.HeaderColor);
// Create point for upper-left corner of drawing.
//x=widht
//y=height
//centers
//float x = (this.ClientSize.Width / 2) - (TxtSize.Width / 2);
//float y = (this.ClientSize.Height / 2) - (TxtSize.Height /
2);
float x = (oMdi.ClientSize.Width / 2) - (TxtSize.Width / 2);
float y = ((float)(oMdi.ClientSize.Height
/this.HeaderLocation)) - (float)(TxtSize.Height/HeaderLocation );
// Set format of string.
StringFormat drawFormat = new StringFormat();
drawFormat.FormatFlags =
StringFormatFlags.MeasureTrailingSpaces;
//draw Shadow
oGraphics.DrawString(Header, this.HeaderFont, GreyBrush, x + 3,
y + 3, drawFormat);
// Draw string to screen.
>
oGraphics.DrawString(Header, this.HeaderFont, BlackBrush, x, y,
drawFormat);
//draw Owner Notice bottom Right
>
>
BlackBrush = new SolidBrush(this.FooterColor);
TxtSize = oGraphics.MeasureString(Footer, this.FooterFont);
>
//text
oGraphics.DrawString(Footer, this.FooterFont, BlackBrush,
oMdi.ClientSize.Width - (TxtSize.Width+10),
>
oMdi.ClientSize.Height - (TxtSize.Height+10), drawFormat);
>
>
}
>
Thanks DaveL
>
>
