예제 #1
0
        private void DrawDefaultShadow(CALayer layer, CGRect bounds, nfloat cornerRadius)
        {
            var pancake = Element as PancakeView;

            // Ideally we want to be able to have individual corner radii + shadows
            // However, on iOS we can only do one radius + shadow.
            layer.CornerRadius  = cornerRadius;
            layer.ShadowRadius  = 10;
            layer.ShadowColor   = UIColor.Black.CGColor;
            layer.ShadowOpacity = 0.4f;
            layer.ShadowOffset  = new SizeF();

            if (pancake.Sides != 4)
            {
                layer.ShadowPath = ShapeUtils.CreatePolygonPath(bounds, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle).CGPath;
            }
            else
            {
                layer.ShadowPath = ShapeUtils.CreateRoundedRectPath(bounds, pancake.CornerRadius).CGPath;
            }
        }
예제 #2
0
        private void DrawElevation(CALayer layer, int elevation, CGRect bounds, nfloat cornerRadius)
        {
            // Source: https://medium.com/material-design-for-ios/part-1-elevation-e48ff795c693
            var pancake = Element as PancakeView;

            layer.CornerRadius  = cornerRadius;
            layer.ShadowRadius  = elevation;
            layer.ShadowColor   = UIColor.Black.CGColor;
            layer.ShadowOpacity = 0.24f;
            layer.ShadowOffset  = new CGSize(0, elevation);

            if (pancake.Sides != 4)
            {
                layer.ShadowPath = ShapeUtils.CreatePolygonPath(bounds, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle).CGPath;
            }
            else
            {
                layer.ShadowPath = ShapeUtils.CreateRoundedRectPath(bounds, pancake.CornerRadius).CGPath;
            }

            layer.MasksToBounds = false;
        }
예제 #3
0
        private void DrawBorder()
        {
            var pancake   = Element as PancakeView;
            var layerName = "borderLayer";

            // remove previous background layer if any
            var prevBorderLayer = _wrapperView.Layer.Sublayers?.FirstOrDefault(x => x.Name == layerName);

            prevBorderLayer?.RemoveFromSuperLayer();

            if (pancake.BorderThickness > 0)
            {
                var borderLayer = new CAShapeLayer
                {
                    StrokeColor = pancake.BorderColor == Xamarin.Forms.Color.Default ? UIColor.Clear.CGColor : pancake.BorderColor.ToCGColor(),
                    FillColor   = null,
                    LineWidth   = pancake.BorderThickness,
                    Name        = layerName
                };

                // Create arcs for the given corner radius.
                bool hasShadowOrElevation = pancake.HasShadow || pancake.Elevation > 0;

                borderLayer.Path = pancake.Sides != 4 ?
                                   ShapeUtils.CreatePolygonPath(Bounds, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle).CGPath :
                                   ShapeUtils.CreateRoundedRectPath(Bounds, pancake.CornerRadius).CGPath; // insetBounds?

                var layerPosition = new CGPoint(borderLayer.Path.BoundingBox.Width / 2, borderLayer.Path.BoundingBox.Height / 2);

                borderLayer.Frame    = borderLayer.Path.BoundingBox;
                borderLayer.Position = layerPosition;

                // Dash pattern for the border.
                if (pancake.BorderIsDashed)
                {
                    borderLayer.LineDashPattern = new NSNumber[] { new NSNumber(6), new NSNumber(3) };
                }

                if ((pancake.BorderGradientStartColor != default(Xamarin.Forms.Color) && pancake.BorderGradientEndColor != default(Xamarin.Forms.Color)) || (pancake.BorderGradientStops != null && pancake.BorderGradientStops.Any()))
                {
                    var gradientFrame = Bounds.Inset(-pancake.BorderThickness, -pancake.BorderThickness);
                    var gradientLayer = CreateGradientLayer(pancake.BorderGradientAngle, gradientFrame);
                    gradientLayer.Position = new CGPoint((gradientFrame.Width / 2) - (pancake.BorderThickness), (gradientFrame.Height / 2) - (pancake.BorderThickness));

                    // Create a clone from the border layer and use that one as the mask.
                    // Why? Because the mask and the border somehow can't be the same, so
                    // don't want to do adjustments to borderLayer because it would influence the border.
                    var maskLayer = new CAShapeLayer()
                    {
                        Path            = borderLayer.Path,
                        Position        = new CGPoint(pancake.BorderThickness, pancake.BorderThickness),
                        FillColor       = null,
                        LineWidth       = pancake.BorderThickness,
                        StrokeColor     = UIColor.Red.CGColor,
                        LineDashPattern = borderLayer.LineDashPattern
                    };

                    gradientLayer.Mask = maskLayer;
                    gradientLayer.Name = layerName;

                    if (pancake.BorderGradientStops != null && pancake.BorderGradientStops.Count > 0)
                    {
                        // A range of colors is given. Let's add them.
                        var orderedStops = pancake.BorderGradientStops.OrderBy(x => x.Offset).ToList();
                        gradientLayer.Colors    = orderedStops.Select(x => x.Color.ToCGColor()).ToArray();
                        gradientLayer.Locations = orderedStops.Select(x => new NSNumber(x.Offset)).ToArray();
                    }
                    else
                    {
                        // Only two colors provided, use that.
                        gradientLayer.Colors = new CGColor[] { pancake.BorderGradientStartColor.ToCGColor(), pancake.BorderGradientEndColor.ToCGColor() };
                    }

                    AddLayer(gradientLayer, -1, _wrapperView);
                }
                else
                {
                    AddLayer(borderLayer, -1, _wrapperView);
                }
            }
        }
예제 #4
0
        private void DrawBackground()
        {
            var pancake   = Element as PancakeView;
            var layerName = "backgroundLayer";

            // Remove previous background layer if any
            var prevBackgroundLayer = _actualView.Layer.Sublayers?.FirstOrDefault(x => x.Name == layerName);

            prevBackgroundLayer?.RemoveFromSuperLayer();

            UIBezierPath cornerPath = null;

            if (pancake.Sides != 4)
            {
                cornerPath = ShapeUtils.CreatePolygonPath(Bounds, pancake.Sides, pancake.CornerRadius.TopLeft, pancake.OffsetAngle);
            }
            else
            {
                cornerPath = ShapeUtils.CreateRoundedRectPath(Bounds, pancake.CornerRadius);
            }

            // The layer used to mask other layers we draw on the background.
            var maskLayer = new CAShapeLayer
            {
                Frame = Bounds,
                Path  = cornerPath.CGPath
            };

            _actualView.Layer.Mask          = maskLayer;
            _actualView.Layer.MasksToBounds = true;

            if ((pancake.BackgroundGradientStartColor != default(Xamarin.Forms.Color) && pancake.BackgroundGradientEndColor != default(Xamarin.Forms.Color)) || (pancake.BackgroundGradientStops != null && pancake.BackgroundGradientStops.Any()))
            {
                // Create a gradient layer that draws our background.
                var gradientLayer = CreateGradientLayer(pancake.BackgroundGradientAngle, Bounds);
                gradientLayer.Name = layerName;

                if (pancake.BackgroundGradientStops != null && pancake.BackgroundGradientStops.Count > 0)
                {
                    // A range of colors is given. Let's add them.
                    var orderedStops = pancake.BackgroundGradientStops.OrderBy(x => x.Offset).ToList();
                    gradientLayer.Colors    = orderedStops.Select(x => x.Color.ToCGColor()).ToArray();
                    gradientLayer.Locations = orderedStops.Select(x => new NSNumber(x.Offset)).ToArray();
                }
                else
                {
                    // Only two colors provided, use that.
                    gradientLayer.Colors = new CGColor[] { pancake.BackgroundGradientStartColor.ToCGColor(), pancake.BackgroundGradientEndColor.ToCGColor() };
                }

                AddLayer(gradientLayer, 0, _actualView);
            }
            else
            {
                // Create a shape layer that draws our background.
                var shapeLayer = new CAShapeLayer
                {
                    Frame         = Bounds,
                    Path          = cornerPath.CGPath,
                    MasksToBounds = true,
                    FillColor     = _colorToRender.CGColor,
                    Name          = layerName
                };

                AddLayer(shapeLayer, 0, _actualView);
            }
        }