protected override void OnDraw(ACanvas canvas)
{
if (Element == null)
{
return;
}
var pancake = Element as PancakeView;
SetClipChildren(true);
//Create path to clip the child
if (pancake.Sides != 4)
{
using (var path = DrawingExtensions.CreatePolygonPath(Width, Height, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle))
{
canvas.Save();
canvas.ClipPath(path);
}
}
else
{
using (var path = DrawingExtensions.CreateRoundedRectPath(Width, Height,
Context.ToPixels(pancake.CornerRadius.TopLeft),
Context.ToPixels(pancake.CornerRadius.TopRight),
Context.ToPixels(pancake.CornerRadius.BottomRight),
Context.ToPixels(pancake.CornerRadius.BottomLeft)))
{
canvas.Save();
canvas.ClipPath(path);
}
}
DrawBorder(canvas, pancake);
}
public override void GetOutline(global::Android.Views.View view, Outline outline)
{
if (_pancake.Sides != 4)
{
var hexPath = DrawingExtensions.CreatePolygonPath(view.Width, view.Height, _pancake.Sides, _pancake.Shadow != null ? 0 : _pancake.CornerRadius.TopLeft, _pancake.OffsetAngle);
if (hexPath.IsConvex)
{
outline.SetConvexPath(hexPath);
}
}
else
{
var path = DrawingExtensions.CreateRoundedRectPath(view.Width, view.Height,
_convertToPixels(_pancake.CornerRadius.TopLeft),
_convertToPixels(_pancake.CornerRadius.TopRight),
_convertToPixels(_pancake.CornerRadius.BottomRight),
_convertToPixels(_pancake.CornerRadius.BottomLeft));
if (path.IsConvex)
{
outline.SetConvexPath(path);
}
}
}
void DrawBackground(ACanvas canvas, int width, int height, CornerRadius cornerRadius)
{
using (var paint = new Paint {
AntiAlias = true
})
using (Path.Direction direction = Path.Direction.Cw)
using (Paint.Style style = Paint.Style.Fill)
{
var path = new Path();
if (_pancake.Sides != 4)
{
path = DrawingExtensions.CreatePolygonPath(width, height, _pancake.Sides, _pancake.CornerRadius.TopLeft, _pancake.OffsetAngle);
}
else
{
float topLeft = _convertToPixels(cornerRadius.TopLeft);
float topRight = _convertToPixels(cornerRadius.TopRight);
float bottomRight = _convertToPixels(cornerRadius.BottomRight);
float bottomLeft = _convertToPixels(cornerRadius.BottomLeft);
path = DrawingExtensions.CreateRoundedRectPath(width, height, topLeft, topRight, bottomRight, bottomLeft);
}
if (_pancake.BackgroundGradientStops != null && _pancake.BackgroundGradientStops.Any())
{
// A range of colors is given. Let's add them.
var orderedStops = _pancake.BackgroundGradientStops.OrderBy(x => x.Offset).ToList();
var colors = orderedStops.Select(x => x.Color.ToAndroid().ToArgb()).ToArray();
var locations = orderedStops.Select(x => x.Offset).ToArray();
var shader = new LinearGradient((float)(canvas.Width * _pancake.BackgroundGradientStartPoint.X),
(float)(canvas.Height * _pancake.BackgroundGradientStartPoint.Y),
(float)(canvas.Width * _pancake.BackgroundGradientEndPoint.X),
(float)(canvas.Height * _pancake.BackgroundGradientEndPoint.Y),
colors, locations, Shader.TileMode.Clamp);
paint.SetShader(shader);
}
else
{
global::Android.Graphics.Color color = _pancake.BackgroundColor.ToAndroid();
paint.SetStyle(style);
paint.Color = color;
}
canvas.DrawPath(path, paint);
}
}
protected override bool DrawChild(ACanvas canvas, global::Android.Views.View child, long drawingTime)
{
if (Element == null)
{
return(false);
}
var pancake = Element as PancakeView;
SetClipChildren(true);
//Create path to clip the child
if (pancake.Sides != 4)
{
using (var path = DrawingExtensions.CreatePolygonPath(Width, Height, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle))
{
canvas.Save();
canvas.ClipPath(path);
}
}
else
{
using (var path = DrawingExtensions.CreateRoundedRectPath(Width, Height,
Context.ToPixels(pancake.CornerRadius.TopLeft),
Context.ToPixels(pancake.CornerRadius.TopRight),
Context.ToPixels(pancake.CornerRadius.BottomRight),
Context.ToPixels(pancake.CornerRadius.BottomLeft)))
{
canvas.Save();
canvas.ClipPath(path);
}
}
// Draw the child first so that the border shows up above it.
var result = base.DrawChild(canvas, child, drawingTime);
canvas.Restore();
DrawBorder(canvas, pancake);
return(result);
}
private void DrawBorder(ACanvas canvas, PancakeView pancake)
{
if (pancake.Border != null && pancake.Border.Thickness != default)
{
var borderThickness = Context.ToPixels(pancake.Border.Thickness);
var halfBorderThickness = borderThickness / 2;
bool hasShadowOrElevation = pancake.Shadow != null && Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop;
// TODO: This doesn't look entirely right yet when using it with rounded corners.
using (var paint = new Paint {
AntiAlias = true
})
using (Path.Direction direction = Path.Direction.Cw)
using (Paint.Style style = Paint.Style.Stroke)
using (var rect = new RectF(pancake.Border.DrawingStyle == BorderDrawingStyle.Outside && !hasShadowOrElevation ? -halfBorderThickness : halfBorderThickness,
pancake.Border.DrawingStyle == BorderDrawingStyle.Outside && !hasShadowOrElevation ? -halfBorderThickness : halfBorderThickness,
pancake.Border.DrawingStyle == BorderDrawingStyle.Outside && !hasShadowOrElevation ? canvas.Width + halfBorderThickness : canvas.Width - halfBorderThickness,
pancake.Border.DrawingStyle == BorderDrawingStyle.Outside && !hasShadowOrElevation ? canvas.Height + halfBorderThickness : canvas.Height - halfBorderThickness))
{
Path path = null;
if (pancake.Sides != 4)
{
path = DrawingExtensions.CreatePolygonPath(Width, Height, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle);
}
else
{
path = DrawingExtensions.CreateRoundedRectPath(Width, Height,
Context.ToPixels(pancake.CornerRadius.TopLeft),
Context.ToPixels(pancake.CornerRadius.TopRight),
Context.ToPixels(pancake.CornerRadius.BottomRight),
Context.ToPixels(pancake.CornerRadius.BottomLeft));
}
if (pancake.Border.DashPattern.Pattern != null && pancake.Border.DashPattern.Pattern.Length > 0)
{
var items = pancake.Border.DashPattern.Pattern.Select(x => Context.ToPixels(Convert.ToSingle(x))).ToArray();
// dashes merge when thickness is increased
// off-distance should be scaled according to thickness
for (int i = 0; i < items.Count(); i++)
{
if (i % 2 != 0)
{
items[i] = items[i] * ((float)pancake.Border.Thickness * 0.5f);
}
}
paint.SetPathEffect(new DashPathEffect(items, 0));
}
if (pancake.Border.GradientStops != null && pancake.Border.GradientStops.Any())
{
// A range of colors is given. Let's add them.
var orderedStops = pancake.Border.GradientStops.OrderBy(x => x.Offset).ToList();
var colors = orderedStops.Select(x => x.Color.ToAndroid().ToArgb()).ToArray();
var locations = orderedStops.Select(x => x.Offset).ToArray();
var shader = new LinearGradient((float)(canvas.Width * pancake.Border.GradientStartPoint.X),
(float)(canvas.Height * pancake.Border.GradientStartPoint.Y),
(float)(canvas.Width * pancake.Border.GradientEndPoint.X),
(float)(canvas.Height * pancake.Border.GradientEndPoint.Y),
colors, locations, Shader.TileMode.Clamp);
paint.SetShader(shader);
}
else
{
paint.Color = pancake.Border.Color.ToAndroid();
}
paint.StrokeCap = Paint.Cap.Square;
paint.StrokeWidth = borderThickness;
paint.SetStyle(style);
canvas.DrawPath(path, paint);
}
}
}