|
protected OnWindowlessPaint ( |
||
| sender | ||
| graphics | ||
| origin | Point | |
| clipRectangle | ||
| return | void | |
protected void OnWindowlessPaint(WindowlessControlHost sender, Graphics graphics, Point origin, Rectangle clipRectangle)
{
SyncWindows();
Rectangle rect = clipRectangle;
Graphics g = graphics;
Point o = origin;
Bitmap backBuffer = null;
Region oldClip = null;
if (DoubleBuffer || sender == this)
{
PrepareBackBuffer(clipRectangle);
o = Point.Empty;
if (DoubleBuffer)
{
g = myGraphics;
backBuffer = myBackBuffer;
PrepareDirtyRegion();
if (myDirtyRegion.IsVisible(clipRectangle))
{
RectangleF regionBounds = myDirtyRegion.GetBounds(myGraphics);
rect = new Rectangle((int)Math.Round(regionBounds.X, 0), (int)Math.Round(regionBounds.Y, 0), (int)Math.Round(regionBounds.Width, 0), (int)Math.Round(regionBounds.Height, 0));
rect.Intersect(clipRectangle);
myDirtyRegion.Exclude(rect);
}
else
{
rect = Rectangle.Empty;
}
}
else
{
o = new Point(-clipRectangle.X, -clipRectangle.Y);
clipRectangle.X = 0;
clipRectangle.Y = 0;
g = ourGraphics;
backBuffer = ourBackBuffer;
}
oldClip = g.Clip;
g.Clip = myDummyRegion;
oldClip.MakeEmpty();
oldClip.Union(clipRectangle);
if (DoubleBuffer)
{
oldClip.Intersect(myDirtyRegion);
}
g.Clip = oldClip;
}
if (rect.Width != 0 && rect.Height != 0)
{
if (BackColor == Color.Transparent)
{
WindowlessControlHost host = Parent as WindowlessControlHost;
if (host != null)
{
Rectangle parentRect = rect;
parentRect.X += Left;
parentRect.Y += Top;
host.OnWindowlessPaint(sender, g, new Point(o.X - Left, o.Y - Top), parentRect);
}
else
{
g.FillRectangle(PlatformBitmap.TransparentBrush, origin.X + clipRectangle.X, origin.Y + clipRectangle.Y, clipRectangle.Width, clipRectangle.Height);
}
}
WindowlessPaintHost(this, g, o, rect);
}
if (DoubleBuffer || sender == this)
{
Rectangle sourceRectangle = clipRectangle;
if (sender == this)
{
clipRectangle.X = -o.X;
clipRectangle.Y = -o.Y;
sourceRectangle.X = 0;
sourceRectangle.Y = 0;
}
g.Clip = oldClip;
if (graphics != null)
{
graphics.DrawImage(backBuffer, new Rectangle(origin.X + clipRectangle.Left, origin.Y + clipRectangle.Top, clipRectangle.Width, clipRectangle.Height), sourceRectangle, GraphicsUnit.Pixel);
}
}
}
