protected virtual IDisposable DrawRibbonGroupGradientOne(RenderContext context,
Rectangle rect,
PaletteState state,
IPaletteRibbonBack palette,
IDisposable memento)
{
if ((rect.Width > 0) && (rect.Height > 0))
{
Color c1 = palette.GetRibbonBackColor1(state);
Color c2 = palette.GetRibbonBackColor2(state);
bool generate = true;
MementoRibbonGroupGradientOne cache;
// Access a cache instance and decide if cache resources need generating
if ((memento == null) || !(memento is MementoRibbonGroupGradientOne))
{
if (memento != null)
memento.Dispose();
cache = new MementoRibbonGroupGradientOne(rect, c1, c2);
memento = cache;
}
else
{
cache = (MementoRibbonGroupGradientOne)memento;
generate = !cache.UseCachedValues(rect, c1, c2);
}
// Do we need to generate the contents of the cache?
if (generate)
{
// Dispose of existing values
cache.Dispose();
RectangleF rectF = new RectangleF(rect.Left - 1, rect.Top - 1, rect.Width + 2, rect.Height + 2);
cache.brush = new LinearGradientBrush(rectF, c1, c2, 90f);
cache.brush.Blend = _ribbonGroup8Blend;
}
// Perform actual drawing using the cache values
context.Graphics.FillRectangle(cache.brush, rect);
}
return memento;
}