7 changed files with 297 additions and 178 deletions
@ -0,0 +1,279 @@ |
|||
// Copyright (c) The Avalonia Project. All rights reserved.
|
|||
// Licensed under the MIT license. See licence.md file in the project root for full license information.
|
|||
|
|||
using System; |
|||
using Avalonia.Media; |
|||
|
|||
namespace Avalonia.Controls.Utils |
|||
{ |
|||
internal class BorderRenderHelper |
|||
{ |
|||
private bool _useComplexRendering; |
|||
private StreamGeometry _backgroundGeometryCache; |
|||
private StreamGeometry _borderGeometryCache; |
|||
|
|||
public void Update(Size finalSize, Thickness borderThickness, CornerRadius cornerRadius) |
|||
{ |
|||
if (borderThickness.IsUniform && cornerRadius.IsUniform) |
|||
{ |
|||
_backgroundGeometryCache = null; |
|||
_borderGeometryCache = null; |
|||
_useComplexRendering = false; |
|||
} |
|||
else |
|||
{ |
|||
_useComplexRendering = true; |
|||
|
|||
var boundRect = new Rect(finalSize); |
|||
var innerRect = boundRect.Deflate(borderThickness); |
|||
var innerCoordinates = new BorderCoordinates(cornerRadius, borderThickness, false); |
|||
|
|||
StreamGeometry backgroundGeometry = null; |
|||
|
|||
if (innerRect.Width != 0 && innerRect.Height != 0) |
|||
{ |
|||
backgroundGeometry = new StreamGeometry(); |
|||
|
|||
using (var ctx = backgroundGeometry.Open()) |
|||
{ |
|||
CreateGeometry(ctx, innerRect, innerCoordinates); |
|||
} |
|||
|
|||
_backgroundGeometryCache = backgroundGeometry; |
|||
} |
|||
else |
|||
{ |
|||
_backgroundGeometryCache = null; |
|||
} |
|||
|
|||
if (boundRect.Width != 0 && innerRect.Height != 0) |
|||
{ |
|||
var outerCoordinates = new BorderCoordinates(cornerRadius, borderThickness, true); |
|||
var borderGeometry = new StreamGeometry(); |
|||
|
|||
using (var ctx = borderGeometry.Open()) |
|||
{ |
|||
CreateGeometry(ctx, boundRect, outerCoordinates); |
|||
|
|||
if (backgroundGeometry != null) |
|||
{ |
|||
CreateGeometry(ctx, innerRect, innerCoordinates); |
|||
} |
|||
} |
|||
|
|||
_borderGeometryCache = borderGeometry; |
|||
} |
|||
else |
|||
{ |
|||
_borderGeometryCache = null; |
|||
} |
|||
} |
|||
} |
|||
|
|||
public void Render(DrawingContext context, Size size, Thickness borders, CornerRadius radii, IBrush background, IBrush borderBrush) |
|||
{ |
|||
if (_useComplexRendering) |
|||
{ |
|||
var backgroundGeometry = _backgroundGeometryCache; |
|||
if (backgroundGeometry != null) |
|||
{ |
|||
context.DrawGeometry(background, null, backgroundGeometry); |
|||
} |
|||
|
|||
var borderGeometry = _borderGeometryCache; |
|||
if (borderGeometry != null) |
|||
{ |
|||
context.DrawGeometry(borderBrush, null, borderGeometry); |
|||
} |
|||
} |
|||
else |
|||
{ |
|||
var borderThickness = borders.Left; |
|||
var cornerRadius = (float)radii.TopLeft; |
|||
var rect = new Rect(size); |
|||
|
|||
if (background != null) |
|||
{ |
|||
context.FillRectangle(background, rect.Deflate(borders), cornerRadius); |
|||
} |
|||
|
|||
if (borderBrush != null && borderThickness > 0) |
|||
{ |
|||
context.DrawRectangle(new Pen(borderBrush, borderThickness), rect.Deflate(borderThickness), cornerRadius); |
|||
} |
|||
} |
|||
} |
|||
|
|||
private static void CreateGeometry(StreamGeometryContext context, Rect boundRect, BorderCoordinates borderCoordinates) |
|||
{ |
|||
var topLeft = new Point(borderCoordinates.LeftTop, 0); |
|||
var topRight = new Point(boundRect.Width - borderCoordinates.RightTop, 0); |
|||
var rightTop = new Point(boundRect.Width, borderCoordinates.TopRight); |
|||
var rightBottom = new Point(boundRect.Width, boundRect.Height - borderCoordinates.BottomRight); |
|||
var bottomRight = new Point(boundRect.Width - borderCoordinates.RightBottom, boundRect.Height); |
|||
var bottomLeft = new Point(borderCoordinates.LeftBottom, boundRect.Height); |
|||
var leftBottom = new Point(0, boundRect.Height - borderCoordinates.BottomLeft); |
|||
var leftTop = new Point(0, borderCoordinates.TopLeft); |
|||
|
|||
|
|||
if (topLeft.X > topRight.X) |
|||
{ |
|||
var scaledX = borderCoordinates.LeftTop / (borderCoordinates.LeftTop + borderCoordinates.RightTop) * boundRect.Width; |
|||
topLeft = new Point(scaledX, topLeft.Y); |
|||
topRight = new Point(scaledX, topRight.Y); |
|||
} |
|||
|
|||
if (rightTop.Y > rightBottom.Y) |
|||
{ |
|||
var scaledY = borderCoordinates.TopRight / (borderCoordinates.TopRight + borderCoordinates.BottomRight) * boundRect.Height; |
|||
rightTop = new Point(rightTop.X, scaledY); |
|||
rightBottom = new Point(rightBottom.X, scaledY); |
|||
} |
|||
|
|||
if (bottomRight.X < bottomLeft.X) |
|||
{ |
|||
var scaledX = borderCoordinates.LeftBottom / (borderCoordinates.LeftBottom + borderCoordinates.RightBottom) * boundRect.Width; |
|||
bottomRight = new Point(scaledX, bottomRight.Y); |
|||
bottomLeft = new Point(scaledX, bottomLeft.Y); |
|||
} |
|||
|
|||
if (leftBottom.Y < leftTop.Y) |
|||
{ |
|||
var scaledY = borderCoordinates.TopLeft / (borderCoordinates.TopLeft + borderCoordinates.BottomLeft) * boundRect.Height; |
|||
leftBottom = new Point(leftBottom.X, scaledY); |
|||
leftTop = new Point(leftTop.X, scaledY); |
|||
} |
|||
|
|||
var offset = new Vector(boundRect.TopLeft.X, boundRect.TopLeft.Y); |
|||
topLeft += offset; |
|||
topRight += offset; |
|||
rightTop += offset; |
|||
rightBottom += offset; |
|||
bottomRight += offset; |
|||
bottomLeft += offset; |
|||
leftBottom += offset; |
|||
leftTop += offset; |
|||
|
|||
context.BeginFigure(topLeft, true); |
|||
|
|||
//Top
|
|||
context.LineTo(topRight); |
|||
|
|||
//TopRight corner
|
|||
var radiusX = boundRect.TopRight.X - topRight.X; |
|||
var radiusY = rightTop.Y - boundRect.TopRight.Y; |
|||
if (radiusX != 0 || radiusY != 0) |
|||
{ |
|||
context.ArcTo(rightTop, new Size(radiusY, radiusY), 0, false, SweepDirection.Clockwise); |
|||
} |
|||
|
|||
//Right
|
|||
context.LineTo(rightBottom); |
|||
|
|||
//BottomRight corner
|
|||
radiusX = boundRect.BottomRight.X - bottomRight.X; |
|||
radiusY = boundRect.BottomRight.Y - rightBottom.Y; |
|||
if (radiusX != 0 || radiusY != 0) |
|||
{ |
|||
context.ArcTo(bottomRight, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise); |
|||
} |
|||
|
|||
//Bottom
|
|||
context.LineTo(bottomLeft); |
|||
|
|||
//BottomLeft corner
|
|||
radiusX = bottomLeft.X - boundRect.BottomLeft.X; |
|||
radiusY = boundRect.BottomLeft.Y - leftBottom.Y; |
|||
if (radiusX != 0 || radiusY != 0) |
|||
{ |
|||
context.ArcTo(leftBottom, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise); |
|||
} |
|||
|
|||
//Left
|
|||
context.LineTo(leftTop); |
|||
|
|||
//TopLeft corner
|
|||
radiusX = topLeft.X - boundRect.TopLeft.X; |
|||
radiusY = leftTop.Y - boundRect.TopLeft.Y; |
|||
|
|||
if (radiusX != 0 || radiusY != 0) |
|||
{ |
|||
context.ArcTo(topLeft, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise); |
|||
} |
|||
|
|||
context.EndFigure(true); |
|||
} |
|||
|
|||
private struct BorderCoordinates |
|||
{ |
|||
internal BorderCoordinates(CornerRadius cornerRadius, Thickness borderThickness, bool isOuter) |
|||
{ |
|||
var left = 0.5 * borderThickness.Left; |
|||
var top = 0.5 * borderThickness.Top; |
|||
var right = 0.5 * borderThickness.Right; |
|||
var bottom = 0.5 * borderThickness.Bottom; |
|||
|
|||
if (isOuter) |
|||
{ |
|||
if (cornerRadius.TopLeft == 0) |
|||
{ |
|||
LeftTop = TopLeft = 0.0; |
|||
} |
|||
else |
|||
{ |
|||
LeftTop = cornerRadius.TopLeft + left; |
|||
TopLeft = cornerRadius.TopLeft + top; |
|||
} |
|||
if (cornerRadius.TopRight == 0) |
|||
{ |
|||
TopRight = RightTop = 0; |
|||
} |
|||
else |
|||
{ |
|||
TopRight = cornerRadius.TopRight + top; |
|||
RightTop = cornerRadius.TopRight + right; |
|||
} |
|||
if (cornerRadius.BottomRight == 0) |
|||
{ |
|||
RightBottom = BottomRight = 0; |
|||
} |
|||
else |
|||
{ |
|||
RightBottom = cornerRadius.BottomRight + right; |
|||
BottomRight = cornerRadius.BottomRight + bottom; |
|||
} |
|||
if (cornerRadius.BottomLeft == 0) |
|||
{ |
|||
BottomLeft = LeftBottom = 0; |
|||
} |
|||
else |
|||
{ |
|||
BottomLeft = cornerRadius.BottomLeft + bottom; |
|||
LeftBottom = cornerRadius.BottomLeft + left; |
|||
} |
|||
} |
|||
else |
|||
{ |
|||
LeftTop = Math.Max(0, cornerRadius.TopLeft - left); |
|||
TopLeft = Math.Max(0, cornerRadius.TopLeft - top); |
|||
TopRight = Math.Max(0, cornerRadius.TopRight - top); |
|||
RightTop = Math.Max(0, cornerRadius.TopRight - right); |
|||
RightBottom = Math.Max(0, cornerRadius.BottomRight - right); |
|||
BottomRight = Math.Max(0, cornerRadius.BottomRight - bottom); |
|||
BottomLeft = Math.Max(0, cornerRadius.BottomLeft - bottom); |
|||
LeftBottom = Math.Max(0, cornerRadius.BottomLeft - left); |
|||
} |
|||
} |
|||
|
|||
internal readonly double LeftTop; |
|||
internal readonly double TopLeft; |
|||
internal readonly double TopRight; |
|||
internal readonly double RightTop; |
|||
internal readonly double RightBottom; |
|||
internal readonly double BottomRight; |
|||
internal readonly double BottomLeft; |
|||
internal readonly double LeftBottom; |
|||
} |
|||
|
|||
} |
|||
} |
|||
Loading…
Reference in new issue