/// <summary>
/// Updates DesiredSize of the Border. Called by parent UIElement. This is the first pass of layout.
/// </summary>
/// <remarks>
/// Border determines its desired size it needs from the specified border the child: its sizing
/// properties, margin, and requested size.
/// </remarks>
/// <param name="constraint">Constraint size is an "upper limit" that the return value should not exceed.</param>
/// <returns>The Decorator's desired size.</returns>
protected override Size MeasureOverride(Size constraint)
{
var child = Child;
var desiredSize = new Size();
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));
}
// Compute the total size required
var borderSize = ThicknessUtil.CollapseThickness(borders);
var paddingSize = ThicknessUtil.CollapseThickness(Padding);
// If we have a child
if (child != null)
{
// Combine into total decorating size
var combined = new Size(borderSize.Width + paddingSize.Width, borderSize.Height + paddingSize.Height);
// Remove size of border only from child's reference size.
var childConstraint = new Size(Math.Max(0.0, constraint.Width - combined.Width),
Math.Max(0.0, constraint.Height - combined.Height));
child.Measure(childConstraint);
var childSize = child.DesiredSize;
// Now use the returned size to drive our size, by adding back the margins, etc.
desiredSize.Width = childSize.Width + combined.Width;
desiredSize.Height = childSize.Height + combined.Height;
}
else
{
// Combine into total decorating size
desiredSize = new Size(borderSize.Width + paddingSize.Width, borderSize.Height + paddingSize.Height);
}
return(desiredSize);
}
private void SimpleRender(DrawingContext dc)
{
var useLayoutRounding = UseLayoutRounding;
var dpi = DpiUtil.GetDpi(this);
Brush brush;
var borderStyle = BorderStyle;
var borders = BorderThickness;
var cornerRadius = CornerRadius;
var outerCornerRadius = cornerRadius.TopLeft; // Already validated that all corners have the same radius
var roundedCorners = !DoubleUtil.IsZero(outerCornerRadius);
var width = RenderSize.Width;
var height = RenderSize.Height;
// Draw border
if (!ThicknessUtil.IsZero(borders) && (brush = BorderBrush) != null)
{
var pen = GetPen(brush, borderStyle, borders.Left, dpi.DpiScaleX, useLayoutRounding);
var penThickness = pen.Thickness;
double x = penThickness * 0.5;
var rect = new Rect(x, x, width - penThickness, height - penThickness);
if (roundedCorners)
{
dc.DrawRoundedRectangle(null, pen, rect, outerCornerRadius, outerCornerRadius);
}
else
{
dc.DrawRectangle(null, pen, rect);
}
}
// Draw background in rectangle inside border.
if ((brush = Background) != null)
{
// Intialize background
Point ptTL, ptBR;
if (useLayoutRounding)
{
ptTL = new Point(UIElementUtil.RoundLayoutValue(borders.Left, dpi.DpiScaleX),
UIElementUtil.RoundLayoutValue(borders.Top, dpi.DpiScaleY));
ptBR = new Point(width - UIElementUtil.RoundLayoutValue(borders.Right, dpi.DpiScaleX),
height - UIElementUtil.RoundLayoutValue(borders.Bottom, dpi.DpiScaleY));
}
else
{
ptTL = new Point(borders.Left, borders.Top);
ptBR = new Point(width - borders.Right, height - borders.Bottom);
}
// Do not draw background if the borders are so large that they overlap.
if (ptBR.X > ptTL.X && ptBR.Y > ptTL.Y)
{
if (roundedCorners)
{
// Determine the inner edge radius
var innerCornerRadius = Math.Max(0.0, outerCornerRadius - borders.Top * 0.5);
dc.DrawRoundedRectangle(brush, null, new Rect(ptTL, ptBR), innerCornerRadius, innerCornerRadius);
}
else
{
dc.DrawRectangle(brush, null, new Rect(ptTL, ptBR));
}
}
}
}
/// <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 IsThicknessValid(object value)
{
return(ThicknessUtil.IsValid((Thickness)value, false, false, false, false));
}