private static IDisposable InnerCreateLayers(BindableView view,
Windows.Foundation.Rect drawArea,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
Action onImageSet
)
{
var disposables = new CompositeDisposable();
var physicalBorderThickness = borderThickness.LogicalToPhysicalPixels();
if (cornerRadius != 0)
{
if (view is UIElement uiElement && uiElement.FrameRoundingAdjustment is { } fra)
{
drawArea.Height += fra.Height;
drawArea.Width += fra.Width;
}
var adjustedArea = drawArea.DeflateBy(physicalBorderThickness);
using (var backgroundPath = cornerRadius.GetOutlinePath(adjustedArea.ToRectF()))
{
//We only need to set a background if the drawArea is non-zero
if (!drawArea.HasZeroArea())
{
if (background is ImageBrush imageBrushBackground)
{
//Copy the path because it will be disposed when we exit the using block
var pathCopy = new Path(backgroundPath);
var setBackground = DispatchSetImageBrushAsBackground(view, imageBrushBackground, drawArea, onImageSet, pathCopy);
disposables.Add(setBackground);
}
else if (background is AcrylicBrush acrylicBrush)
{
var apply = acrylicBrush.Subscribe(view, drawArea, backgroundPath);
disposables.Add(apply);
}
else
{
var fillPaint = background?.GetFillPaint(drawArea) ?? new Paint()
{
Color = Android.Graphics.Color.Transparent
};
ExecuteWithNoRelayout(view, v => v.SetBackgroundDrawable(Brush.GetBackgroundDrawable(background, drawArea, fillPaint, backgroundPath)));
}
disposables.Add(() => ExecuteWithNoRelayout(view, v => v.SetBackgroundDrawable(null)));
}
if (borderThickness != Thickness.Empty && borderBrush != null && !(borderBrush is ImageBrush))
{
using (var strokePaint = new Paint(borderBrush.GetStrokePaint(drawArea)))
{
//Create the path for the outer and inner rectangles that will become our border shape
var borderPath = cornerRadius.GetOutlinePath(drawArea.ToRectF());
borderPath.AddRoundRect(adjustedArea.ToRectF(), cornerRadius.GetRadii(), Path.Direction.Ccw);
var overlay = GetOverlayDrawable(
strokePaint,
physicalBorderThickness,
new global::System.Drawing.Size((int)drawArea.Width, (int)drawArea.Height),
borderPath);
if (overlay != null)
{
overlay.SetBounds(0, 0, view.Width, view.Height);
SetOverlay(view, disposables, overlay);
}
}
}
}
}
else // No corner radius
{
//We only need to set a background if the drawArea is non-zero
if (!drawArea.HasZeroArea())
{
if (background is ImageBrush imageBrushBackground)
{
var setBackground = DispatchSetImageBrushAsBackground(view, imageBrushBackground, drawArea, onImageSet);
disposables.Add(setBackground);
}
else if (background is AcrylicBrush acrylicBrush)
{
var apply = acrylicBrush.Subscribe(view, drawArea, maskingPath: null);
disposables.Add(apply);
}
else
{
var fillPaint = background?.GetFillPaint(drawArea) ?? new Paint()
{
Color = Android.Graphics.Color.Transparent
};
ExecuteWithNoRelayout(view, v => v.SetBackgroundDrawable(Brush.GetBackgroundDrawable(background, drawArea, fillPaint)));
}
disposables.Add(() => ExecuteWithNoRelayout(view, v => v.SetBackgroundDrawable(null)));
}
}
if (borderBrush != null && !(borderBrush is ImageBrush))
{
//TODO: Handle case that BorderBrush is an ImageBrush
using (var strokePaint = borderBrush.GetStrokePaint(drawArea))
{
var overlay = GetOverlayDrawable(strokePaint, physicalBorderThickness, new global::System.Drawing.Size(view.Width, view.Height));
if (overlay != null)
{
overlay.SetBounds(0, 0, view.Width, view.Height);
SetOverlay(view, disposables, overlay);
}
}
}
return(disposables);
}
