private void UpdateRegion()
{
if (!IsHandleCreated)
{
return;
}
UpdateLocation();
var balloonBounds = new Rectangle(Point.Empty, Size);
switch (tailLocation)
{
case TailLocation.Left:
balloonBounds.X += TailLength;
balloonBounds.Width -= TailLength;
break;
case TailLocation.Bottom:
balloonBounds.Height -= TailLength;
break;
case TailLocation.Right:
balloonBounds.Width -= TailLength;
break;
}
var radius = Math.Min(CornerRadius, balloonBounds.Height / 2);
var figure = new GeometryPathFigure(balloonBounds.Left + radius, balloonBounds.Top);
figure.LineTo(balloonBounds.Right - radius, balloonBounds.Top);
figure.AddArc(-radius, 0, radius, 270, 90);
InsertBalloonTailRight(figure, balloonBounds);
figure.LineTo(balloonBounds.Right, balloonBounds.Bottom - radius);
figure.AddArc(-(radius * 2), -radius, radius, 0, 90);
InsertBalloonTailBottom(figure, balloonBounds);
figure.LineTo(balloonBounds.Left + radius, balloonBounds.Bottom);
figure.AddArc(-radius, -(radius * 2), radius, 90, 90);
InsertBalloonTailLeft(figure, balloonBounds);
figure.LineTo(balloonBounds.Left, balloonBounds.Top + radius);
figure.AddArc(0, -radius, radius, 180, 90);
if (balloonPath != null)
{
balloonPath.Dispose();
balloonPath = null;
}
balloonPath = figure.GetPath();
Region = new Region(balloonPath);
}
private void InsertBalloonTailLeft(GeometryPathFigure figure, Rectangle bounds)
{
if (tailLocation != TailLocation.Left)
{
return;
}
var anchorMid = anchorBounds.Top + (anchorBounds.Height / 2);
var balloonTop = Math.Max(anchorMid - (bounds.Height / 2), anchorScreen.Bounds.Top);
var tailStartAbsolute = Math.Min(Math.Max(anchorMid, balloonTop), balloonTop + bounds.Height - CornerRadius);
var tailStart = Math.Max(tailStartAbsolute - balloonTop, CornerRadius + (int)(TailLength / 1.5) + Fudge);
var tailEnd = tailStart - (int)(TailLength / 1.5);
figure.LineTo(bounds.Left, tailStart);
figure.LineTo(bounds.Left - TailLength, tailStart);
figure.LineTo(bounds.Left, tailEnd);
}
private void InsertBalloonTailBottom(GeometryPathFigure figure, Rectangle bounds)
{
if (tailLocation != TailLocation.Bottom)
{
return;
}
var anchorMid = anchorBounds.Left + (anchorBounds.Width / 2);
var balloonLeft = Math.Min(Math.Max(anchorMid - (bounds.Width / 2), anchorScreen.Bounds.Left), anchorScreen.Bounds.Right - bounds.Width);
var tailStartAbsolute = Math.Min(Math.Max(anchorMid, balloonLeft),
balloonLeft + bounds.Width - CornerRadius);
var tailStart = Math.Max(tailStartAbsolute - balloonLeft, CornerRadius + (int)(TailLength / 1.5) + Fudge);
var tailEnd = tailStart - (int)(TailLength / 1.5);
figure.LineTo(tailStart, bounds.Bottom);
figure.LineTo(tailStart, bounds.Bottom + TailLength);
figure.LineTo(tailEnd, bounds.Bottom);
}
