protected void RenderCacheImages()
{
CustomProgressBar.DisposeToNull(backgroundCacheImage);
CustomProgressBar.DisposeToNull(overlayCacheImage);
backgroundCacheImage = new Bitmap(Width, Height);
using (Graphics backgroundCacheGraphics = Graphics.FromImage(backgroundCacheImage))
{
// Render the background, here we pass the entire width of the progressbar as the distance value because we
// always want the entire background to be drawn.
Render(backgroundCacheGraphics, backgroundImage, backgroundDrawMethod, backgroundLeadingSize, backgroundTrailingSize, this.Width);
}
overlayCacheImage = new Bitmap(Width, Height);
using (Graphics overlayCacheGraphics = Graphics.FromImage(overlayCacheImage))
{
// Make sure that we retain our chroma key value by starting with a fully transparent overlay cache image
#if PocketPC
overlayCacheGraphics.FillRectangle(new SolidBrush(Color.Magenta), ClientRectangle);
#else
overlayCacheGraphics.FillRectangle(new SolidBrush(Color.Transparent), ClientRectangle);
#endif
// Render the overlay, this way we can get neat border on our progress bar (for example)
Render(overlayCacheGraphics, overlayImage, overlayDrawMethod, overlayLeadingSize, overlayTrailingSize, this.Width);
}
}
private void ProgressBar_Resize(object sender, EventArgs e)
{
//
// If the progressbar is resized we dump out current offscreen and set it to null, a new one
// will then be created as the OnPaint method will request this if it is null.
//
CustomProgressBar.DisposeToNull(offscreenImage);
CustomProgressBar.DisposeToNull(offscreen);
DoLayout();
RenderCacheImages();
}
