/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="owner">The parent layer to apply the shape</param>
/// <param name="area">The rendering area</param>
/// <param name="background">The background brush</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="backgroundImage">The background image in case of a ImageBrush background</param>
public void UpdateLayer(
FrameworkElement owner,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
object backgroundImage
)
{
// Bounds is captured to avoid calling twice calls below.
var area = new Rect(0, 0, owner.ActualWidth, owner.ActualHeight);
var newState = new LayoutState(area, background, borderThickness, borderBrush, cornerRadius, backgroundImage);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
if (
background != null ||
cornerRadius != CornerRadius.None ||
(borderThickness != Thickness.Empty && borderBrush != null)
)
{
_layerDisposable.Disposable = null;
_layerDisposable.Disposable = InnerCreateLayer(owner, newState);
}
else
{
_layerDisposable.Disposable = null;
}
_currentState = newState;
}
}
/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="view">The view to which we should add the layers</param>
/// <param name="background">The background brush of the border</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="padding">The padding to apply on the content</param>
public void UpdateLayer(
FrameworkElement view,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
Thickness padding,
bool willUpdateMeasures = false
)
{
// This is required because android Height and Width are hidden by Control.
var baseView = view as View;
var logicalDrawArea = view.LayoutSlot;
// Set origin to 0, because drawArea should be in the coordinates of the view itself
logicalDrawArea.X = 0;
logicalDrawArea.Y = 0;
var drawArea = logicalDrawArea.LogicalToPhysicalPixels();
var newState = new LayoutState(drawArea, background, borderThickness, borderBrush, cornerRadius, padding);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
bool imageHasChanged = newState.BackgroundImageSource != previousLayoutState?.BackgroundImageSource;
bool shouldDisposeEagerly = imageHasChanged || newState.BackgroundImageSource == null;
if (shouldDisposeEagerly)
{
// Clear previous value anyway in order to make sure the previous values are unset before the new ones.
// This prevents the case where a second update would set a new background and then set the background to null when disposing the previous.
_layerDisposable.Disposable = null;
}
Action onImageSet = null;
var disposable = InnerCreateLayers(view, drawArea, background, borderThickness, borderBrush, cornerRadius, () => onImageSet?.Invoke());
// Most of the time we immediately dispose the previous layer. In the case where we're using an ImageBrush,
// and the backing image hasn't changed, we dispose the previous layer at the moment the new background is applied,
// to prevent a visible flicker.
if (shouldDisposeEagerly)
{
_layerDisposable.Disposable = disposable;
}
else
{
onImageSet = () => _layerDisposable.Disposable = disposable;
}
if (willUpdateMeasures)
{
view.RequestLayout();
}
else
{
view.Invalidate();
}
_currentState = newState;
}
}
/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="owner">The parent layer to apply the shape</param>
/// <param name="area">The rendering area</param>
/// <param name="background">The background brush</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="backgroundImage">The background image in case of a ImageBrush background</param>
public void UpdateLayer(
UIView owner,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
UIImage backgroundImage
)
{
// Frame is captured to avoid calling twice calls below.
var frame = owner.Frame;
var area = new CGRect(0, 0, frame.Width, frame.Height);
var newState = new LayoutState(area, background, borderThickness, borderBrush, cornerRadius, backgroundImage);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
if (
background != null ||
(borderThickness != Thickness.Empty && borderBrush != null)
)
{
_layerDisposable.Disposable = null;
_layerDisposable.Disposable = InnerCreateLayer(owner.Layer, area, background, borderThickness, borderBrush, cornerRadius);
}
else
{
_layerDisposable.Disposable = null;
}
_currentState = newState;
}
}
/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="owner">The parent layer to apply the shape</param>
/// <param name="area">The rendering area</param>
/// <param name="background">The background brush</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="backgroundImage">The background image in case of a ImageBrush background</param>
/// <returns>An updated BoundsPath if the layer has been created or updated; null if there is no change.</returns>
public CGPath UpdateLayer(
_View owner,
Brush background,
BackgroundSizing backgroundSizing,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
_Image backgroundImage)
{
// Bounds is captured to avoid calling twice calls below.
var bounds = owner.Bounds;
var area = new CGRect(0, 0, bounds.Width, bounds.Height);
var newState = new LayoutState(area, background, backgroundSizing, borderThickness, borderBrush, cornerRadius, backgroundImage);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
#if __MACOS__
owner.WantsLayer = true;
#endif
_layerDisposable.Disposable = null;
_layerDisposable.Disposable = InnerCreateLayer(owner as UIElement, owner.Layer, newState);
_currentState = newState;
}
return(newState.BoundsPath);
}
/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="view">The view to which we should add the layers</param>
/// <param name="background">The background brush of the border</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="padding">The padding to apply on the content</param>
public void UpdateLayers(
FrameworkElement view,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
Thickness padding
)
{
// This is required because android Height and Width are hidden by Control.
var baseView = view as View;
Size targetSize = new Size(baseView.Width, baseView.Height);
var drawArea = new Windows.Foundation.Rect(0, 0, targetSize.Width, targetSize.Height);
var newState = new LayoutState(drawArea, background, borderThickness, borderBrush, cornerRadius, padding);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
bool imageHasChanged = newState.BackgroundImageSource != previousLayoutState?.BackgroundImageSource;
bool shouldDisposeEagerly = imageHasChanged || newState.BackgroundImageSource == null;
if (shouldDisposeEagerly)
{
// Clear previous value anyway in order to make sure the previous values are unset before the new ones.
// This prevents the case where a second update would set a new background and then set the background to null when disposing the previous.
_layerDisposable.Disposable = null;
}
if (
background != null ||
(borderThickness != Thickness.Empty && borderBrush != null)
)
{
Action onImageSet = null;
var disposable = InnerCreateLayers(view, drawArea, background, borderThickness, borderBrush, cornerRadius, () => onImageSet?.Invoke());
// Most of the time we immediately dispose the previous layer. In the case where we're using an ImageBrush,
// and the backing image hasn't changed, we dispose the previous layer at the moment the new background is applied,
// to prevent a visible flicker.
if (shouldDisposeEagerly)
{
_layerDisposable.Disposable = disposable;
}
else
{
onImageSet = () => _layerDisposable.Disposable = disposable;
}
}
view.Invalidate();
_currentState = newState;
}
}
/// <summary>
/// Updates or creates a sublayer to render a border-like shape.
/// </summary>
/// <param name="owner">The parent layer to apply the shape</param>
/// <param name="area">The rendering area</param>
/// <param name="background">The background brush</param>
/// <param name="borderThickness">The border thickness</param>
/// <param name="borderBrush">The border brush</param>
/// <param name="cornerRadius">The corner radius</param>
/// <param name="backgroundImage">The background image in case of a ImageBrush background</param>
public void UpdateLayer(
_View owner,
Brush background,
Thickness borderThickness,
Brush borderBrush,
CornerRadius cornerRadius,
_Image backgroundImage
)
{
// Bounds is captured to avoid calling twice calls below.
var bounds = owner.Bounds;
var area = new CGRect(0, 0, bounds.Width, bounds.Height);
var newState = new LayoutState(area, background, borderThickness, borderBrush, cornerRadius, backgroundImage);
var previousLayoutState = _currentState;
if (!newState.Equals(previousLayoutState))
{
if (
background != null ||
(borderThickness != Thickness.Empty && borderBrush != null)
)
{
#if __MACOS__
owner.WantsLayer = true;
#endif
_layerDisposable.Disposable = null;
_layerDisposable.Disposable = InnerCreateLayer(owner.Layer, area, background, borderThickness, borderBrush, cornerRadius);
}
else
{
_layerDisposable.Disposable = null;
}
_currentState = newState;
}
}