/// <summary>
/// Border computes the position of its single child and applies its child's alignments to the child.
/// </summary>
/// <param name="finalSize">The size reserved for this element by the parent</param>
/// <returns>The actual ink area of the element, typically the same as finalSize</returns>
protected override Size ArrangeOverride(Size finalSize)
{
var borders = BorderThickness;
if (UseLayoutRounding)
{
var dpi = DpiUtil.GetDpi(this);
borders = new Thickness(UIElementUtil.RoundLayoutValue(borders.Left, dpi.DpiScaleX), UIElementUtil.RoundLayoutValue(borders.Top, dpi.DpiScaleY),
UIElementUtil.RoundLayoutValue(borders.Right, dpi.DpiScaleX), UIElementUtil.RoundLayoutValue(borders.Bottom, dpi.DpiScaleY));
}
var boundRect = new Rect(finalSize);
var innerRect = RectUtil.Deflate(boundRect, borders);
// arrange child
var child = Child;
if (child != null)
{
Rect childRect = RectUtil.Deflate(innerRect, Padding);
child.Arrange(childRect);
}
var radius = CornerRadius;
useComplexRender = !CornerRadiusUtil.IsUniform(radius) || !ThicknessUtil.IsUniform(borders);
backgroundGeometryCache = upperLeftCache = upperRightCache = lowerRightCache = lowerLeftCache = null;
if (useComplexRender)
{
// calculate border / background rendering geometry
if (!DoubleUtil.IsZero(boundRect.Width) && !DoubleUtil.IsZero(boundRect.Height))
{
var outerRadii = new Radii(boundRect, radius, borders, true);
// Upper-right corner
var radiusX = boundRect.TopRight.X - outerRadii.TopRight.X;
var radiusY = outerRadii.RightTop.Y - boundRect.TopRight.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
upperRightCache = GenerateRoundedGeometry(outerRadii.TopRight, outerRadii.RightTop, new Size(radiusX, radiusY));
}
// Lower-right corner
radiusX = boundRect.BottomRight.X - outerRadii.BottomRight.X;
radiusY = boundRect.BottomRight.Y - outerRadii.RightBottom.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
lowerRightCache = GenerateRoundedGeometry(outerRadii.RightBottom, outerRadii.BottomRight, new Size(radiusX, radiusY));
}
// Lower-left corner
radiusX = outerRadii.BottomLeft.X - boundRect.BottomLeft.X;
radiusY = boundRect.BottomLeft.Y - outerRadii.LeftBottom.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
lowerLeftCache = GenerateRoundedGeometry(outerRadii.BottomLeft, outerRadii.LeftBottom, new Size(radiusX, radiusY));
}
// Upper-left corner
radiusX = outerRadii.TopLeft.X - boundRect.TopLeft.X;
radiusY = outerRadii.LeftTop.Y - boundRect.TopLeft.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
upperLeftCache = GenerateRoundedGeometry(outerRadii.LeftTop, outerRadii.TopLeft, new Size(radiusX, radiusY));
}
}
if (!DoubleUtil.IsZero(innerRect.Width) && !DoubleUtil.IsZero(innerRect.Height))
{
var innerRadii = new Radii(innerRect, radius, borders, false);
var backgroundGeometry = new StreamGeometry();
using (StreamGeometryContext sc = backgroundGeometry.Open())
{
// create the border geometry
sc.BeginFigure(innerRadii.TopLeft, true /* is filled */, true /* is closed */);
// Top line
sc.LineTo(innerRadii.TopRight, true /* is stroked */, false /* is smooth join */);
// Upper-right corners
var radiusX = innerRect.TopRight.X - innerRadii.TopRight.X;
var radiusY = innerRadii.RightTop.Y - innerRect.TopRight.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
sc.ArcTo(innerRadii.RightTop, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise, true, false);
}
// Right line
sc.LineTo(innerRadii.RightBottom, true /* is stroked */, false /* is smooth join */);
// Lower-right corners
radiusX = innerRect.BottomRight.X - innerRadii.BottomRight.X;
radiusY = innerRect.BottomRight.Y - innerRadii.RightBottom.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
sc.ArcTo(innerRadii.BottomRight, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise, true, false);
}
// Bottom line
sc.LineTo(innerRadii.BottomLeft, true /* is stroked */, false /* is smooth join */);
// Lower-left corners
radiusX = innerRadii.BottomLeft.X - innerRect.BottomLeft.X;
radiusY = innerRect.BottomLeft.Y - innerRadii.LeftBottom.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
sc.ArcTo(innerRadii.LeftBottom, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise, true, false);
}
// Left line
sc.LineTo(innerRadii.LeftTop, true /* is stroked */, false /* is smooth join */);
// Upper-left corners
radiusX = innerRadii.TopLeft.X - innerRect.TopLeft.X;
radiusY = innerRadii.LeftTop.Y - innerRect.TopLeft.Y;
if (!DoubleUtil.IsZero(radiusX) || !DoubleUtil.IsZero(radiusY))
{
sc.ArcTo(innerRadii.TopLeft, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise, true, false);
}
}
backgroundGeometry.Freeze();
backgroundGeometryCache = backgroundGeometry;
}
}
return(finalSize);
}
private static bool IsCornerRadiusValid(object value)
{
return(CornerRadiusUtil.IsValid((CornerRadius)value, false, false, false, false));
}