327 строки
9.6 KiB
C#
327 строки
9.6 KiB
C#
using System;
|
|
using System.ComponentModel;
|
|
using System.Drawing;
|
|
using System.Threading;
|
|
using CoreAnimation;
|
|
using Xamarin.Forms.Internals;
|
|
#if __MOBILE__
|
|
using Xamarin.Forms.PlatformConfiguration.iOSSpecific;
|
|
|
|
namespace Xamarin.Forms.Platform.iOS
|
|
#else
|
|
|
|
namespace Xamarin.Forms.Platform.MacOS
|
|
#endif
|
|
{
|
|
public class VisualElementTracker : IDisposable
|
|
{
|
|
readonly EventHandler<EventArg<VisualElement>> _batchCommittedHandler;
|
|
|
|
readonly PropertyChangedEventHandler _propertyChangedHandler;
|
|
readonly EventHandler _sizeChangedEventHandler;
|
|
bool _disposed;
|
|
VisualElement _element;
|
|
|
|
// Track these by hand because the calls down into iOS are too expensive
|
|
bool _isInteractive;
|
|
Rectangle _lastBounds;
|
|
#if !__MOBILE__
|
|
Rectangle _lastParentBounds;
|
|
#endif
|
|
CALayer _layer;
|
|
int _updateCount;
|
|
|
|
public VisualElementTracker(IVisualElementRenderer renderer)
|
|
{
|
|
Renderer = renderer ?? throw new ArgumentNullException("renderer");
|
|
|
|
_propertyChangedHandler = HandlePropertyChanged;
|
|
_sizeChangedEventHandler = HandleSizeChanged;
|
|
_batchCommittedHandler = HandleRedrawNeeded;
|
|
|
|
renderer.ElementChanged += OnRendererElementChanged;
|
|
SetElement(null, renderer.Element);
|
|
}
|
|
|
|
IVisualElementRenderer Renderer { get; set; }
|
|
|
|
public void Dispose()
|
|
{
|
|
Dispose(true);
|
|
}
|
|
|
|
public event EventHandler NativeControlUpdated;
|
|
|
|
protected virtual void Dispose(bool disposing)
|
|
{
|
|
if (_disposed)
|
|
return;
|
|
|
|
_disposed = true;
|
|
|
|
if (disposing)
|
|
{
|
|
SetElement(_element, null);
|
|
|
|
if (_layer != null)
|
|
{
|
|
_layer.Dispose();
|
|
_layer = null;
|
|
}
|
|
|
|
Renderer.ElementChanged -= OnRendererElementChanged;
|
|
Renderer = null;
|
|
}
|
|
}
|
|
|
|
void HandlePropertyChanged(object sender, PropertyChangedEventArgs e)
|
|
{
|
|
if (e.PropertyName == VisualElement.XProperty.PropertyName || e.PropertyName == VisualElement.YProperty.PropertyName || e.PropertyName == VisualElement.WidthProperty.PropertyName ||
|
|
e.PropertyName == VisualElement.HeightProperty.PropertyName || e.PropertyName == VisualElement.AnchorXProperty.PropertyName || e.PropertyName == VisualElement.AnchorYProperty.PropertyName ||
|
|
e.PropertyName == VisualElement.TranslationXProperty.PropertyName || e.PropertyName == VisualElement.TranslationYProperty.PropertyName || e.PropertyName == VisualElement.ScaleProperty.PropertyName || e.PropertyName == VisualElement.ScaleXProperty.PropertyName || e.PropertyName == VisualElement.ScaleYProperty.PropertyName ||
|
|
e.PropertyName == VisualElement.RotationProperty.PropertyName || e.PropertyName == VisualElement.RotationXProperty.PropertyName || e.PropertyName == VisualElement.RotationYProperty.PropertyName ||
|
|
e.PropertyName == VisualElement.IsVisibleProperty.PropertyName || e.PropertyName == VisualElement.IsEnabledProperty.PropertyName ||
|
|
e.PropertyName == VisualElement.InputTransparentProperty.PropertyName || e.PropertyName == VisualElement.OpacityProperty.PropertyName ||
|
|
e.PropertyName == Layout.CascadeInputTransparentProperty.PropertyName)
|
|
UpdateNativeControl(); // poorly optimized
|
|
}
|
|
|
|
void HandleRedrawNeeded(object sender, EventArgs e)
|
|
{
|
|
UpdateNativeControl();
|
|
}
|
|
|
|
void HandleSizeChanged(object sender, EventArgs e)
|
|
{
|
|
UpdateNativeControl();
|
|
}
|
|
|
|
void OnRendererElementChanged(object s, VisualElementChangedEventArgs e)
|
|
{
|
|
if (_element == e.NewElement)
|
|
return;
|
|
|
|
SetElement(_element, e.NewElement);
|
|
}
|
|
|
|
void OnUpdateNativeControl(CALayer caLayer)
|
|
{
|
|
var view = Renderer.Element;
|
|
var uiview = Renderer.NativeView;
|
|
|
|
if (view == null || view.Batched)
|
|
return;
|
|
|
|
bool shouldInteract;
|
|
|
|
if (view is Layout layout)
|
|
{
|
|
if (layout.InputTransparent)
|
|
{
|
|
shouldInteract = !layout.CascadeInputTransparent;
|
|
}
|
|
else
|
|
{
|
|
shouldInteract = layout.IsEnabled;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
shouldInteract = !view.InputTransparent && view.IsEnabled;
|
|
}
|
|
|
|
if (_isInteractive != shouldInteract)
|
|
{
|
|
#if __MOBILE__
|
|
uiview.UserInteractionEnabled = shouldInteract;
|
|
#endif
|
|
_isInteractive = shouldInteract;
|
|
}
|
|
|
|
var boundsChanged = _lastBounds != view.Bounds;
|
|
#if !__MOBILE__
|
|
var viewParent = view.RealParent as VisualElement;
|
|
var parentBoundsChanged = _lastParentBounds != (viewParent == null ? Rectangle.Zero : viewParent.Bounds);
|
|
#else
|
|
var thread = !boundsChanged && !caLayer.Frame.IsEmpty && Application.Current?.OnThisPlatform()?.GetHandleControlUpdatesOnMainThread() == false;
|
|
#endif
|
|
var anchorX = (float)view.AnchorX;
|
|
var anchorY = (float)view.AnchorY;
|
|
var translationX = (float)view.TranslationX;
|
|
var translationY = (float)view.TranslationY;
|
|
var rotationX = (float)view.RotationX;
|
|
var rotationY = (float)view.RotationY;
|
|
var rotation = (float)view.Rotation;
|
|
var scale = (float)view.Scale;
|
|
var scaleX = (float)view.ScaleX * scale;
|
|
var scaleY = (float)view.ScaleY * scale;
|
|
var width = (float)view.Width;
|
|
var height = (float)view.Height;
|
|
var x = (float)view.X + (float)CompressedLayout.GetHeadlessOffset(view).X;
|
|
var y = (float)view.Y + (float)CompressedLayout.GetHeadlessOffset(view).Y;
|
|
var opacity = (float)view.Opacity;
|
|
var isVisible = view.IsVisible;
|
|
|
|
var updateTarget = Interlocked.Increment(ref _updateCount);
|
|
|
|
void update()
|
|
{
|
|
if (updateTarget != _updateCount)
|
|
return;
|
|
#if __MOBILE__
|
|
var visualElement = view;
|
|
#endif
|
|
var parent = view.RealParent;
|
|
|
|
var shouldRelayoutSublayers = false;
|
|
if (isVisible && caLayer.Hidden)
|
|
{
|
|
#if !__MOBILE__
|
|
uiview.Hidden = false;
|
|
#endif
|
|
caLayer.Hidden = false;
|
|
if (!caLayer.Frame.IsEmpty)
|
|
shouldRelayoutSublayers = true;
|
|
}
|
|
|
|
if (!isVisible && !caLayer.Hidden)
|
|
{
|
|
#if !__MOBILE__
|
|
uiview.Hidden = true;
|
|
#endif
|
|
caLayer.Hidden = true;
|
|
shouldRelayoutSublayers = true;
|
|
}
|
|
|
|
// ripe for optimization
|
|
var transform = CATransform3D.Identity;
|
|
|
|
#if __MOBILE__
|
|
bool shouldUpdate = (!(visualElement is Page) || visualElement is ContentPage) && width > 0 && height > 0 && parent != null && boundsChanged;
|
|
#else
|
|
// We don't care if it's a page or not since bounds of the window can change
|
|
// TODO: Find why it doesn't work to check if the parentsBounds changed and remove true;
|
|
parentBoundsChanged = true;
|
|
bool shouldUpdate = width > 0 && height > 0 && parent != null && (boundsChanged || parentBoundsChanged);
|
|
#endif
|
|
// Dont ever attempt to actually change the layout of a Page unless it is a ContentPage
|
|
// iOS is a really big fan of you not actually modifying the View's of the UIViewControllers
|
|
if (shouldUpdate)
|
|
{
|
|
#if __MOBILE__
|
|
var target = new RectangleF(x, y, width, height);
|
|
#else
|
|
var visualParent = parent as VisualElement;
|
|
float newY = visualParent == null ? y : Math.Max(0, (float)(visualParent.Height - y - view.Height));
|
|
var target = new RectangleF(x, newY, width, height);
|
|
#endif
|
|
|
|
// must reset transform prior to setting frame...
|
|
caLayer.Transform = transform;
|
|
uiview.Frame = target;
|
|
if (shouldRelayoutSublayers)
|
|
caLayer.LayoutSublayers();
|
|
}
|
|
else if (width <= 0 || height <= 0)
|
|
{
|
|
//TODO: FInd why it doesn't work
|
|
#if __MOBILE__
|
|
caLayer.Hidden = true;
|
|
#endif
|
|
return;
|
|
}
|
|
#if __MOBILE__
|
|
caLayer.AnchorPoint = new PointF(anchorX, anchorY);
|
|
#else
|
|
caLayer.AnchorPoint = new PointF(anchorX - 0.5f, anchorY - 0.5f);
|
|
#endif
|
|
caLayer.Opacity = opacity;
|
|
const double epsilon = 0.001;
|
|
|
|
// position is relative to anchor point
|
|
if (Math.Abs(anchorX - .5) > epsilon)
|
|
transform = transform.Translate((anchorX - .5f) * width, 0, 0);
|
|
if (Math.Abs(anchorY - .5) > epsilon)
|
|
transform = transform.Translate(0, (anchorY - .5f) * height, 0);
|
|
|
|
if (Math.Abs(translationX) > epsilon || Math.Abs(translationY) > epsilon)
|
|
transform = transform.Translate(translationX, translationY, 0);
|
|
|
|
if (Math.Abs(scaleX - 1) > epsilon || Math.Abs(scaleY - 1) > epsilon)
|
|
transform = transform.Scale(scaleX, scaleY, scale);
|
|
|
|
// not just an optimization, iOS will not "pixel align" a view which has m34 set
|
|
if (Math.Abs(rotationY % 180) > epsilon || Math.Abs(rotationX % 180) > epsilon)
|
|
transform.m34 = 1.0f / -400f;
|
|
|
|
if (Math.Abs(rotationX % 360) > epsilon)
|
|
transform = transform.Rotate(rotationX * (float)Math.PI / 180.0f, 1.0f, 0.0f, 0.0f);
|
|
if (Math.Abs(rotationY % 360) > epsilon)
|
|
transform = transform.Rotate(rotationY * (float)Math.PI / 180.0f, 0.0f, 1.0f, 0.0f);
|
|
|
|
transform = transform.Rotate(rotation * (float)Math.PI / 180.0f, 0.0f, 0.0f, 1.0f);
|
|
caLayer.Transform = transform;
|
|
}
|
|
|
|
#if __MOBILE__
|
|
if (thread)
|
|
CADisplayLinkTicker.Default.Invoke(update);
|
|
else
|
|
update();
|
|
#else
|
|
update();
|
|
#endif
|
|
|
|
_lastBounds = view.Bounds;
|
|
#if !__MOBILE__
|
|
_lastParentBounds = viewParent?.Bounds ?? Rectangle.Zero;
|
|
#endif
|
|
}
|
|
|
|
void SetElement(VisualElement oldElement, VisualElement newElement)
|
|
{
|
|
if (oldElement != null)
|
|
{
|
|
oldElement.PropertyChanged -= _propertyChangedHandler;
|
|
oldElement.SizeChanged -= _sizeChangedEventHandler;
|
|
oldElement.BatchCommitted -= _batchCommittedHandler;
|
|
}
|
|
|
|
_element = newElement;
|
|
|
|
if (newElement != null)
|
|
{
|
|
newElement.BatchCommitted += _batchCommittedHandler;
|
|
newElement.SizeChanged += _sizeChangedEventHandler;
|
|
newElement.PropertyChanged += _propertyChangedHandler;
|
|
|
|
UpdateNativeControl();
|
|
}
|
|
}
|
|
|
|
void UpdateNativeControl()
|
|
{
|
|
Performance.Start(out string reference);
|
|
|
|
if (_disposed)
|
|
return;
|
|
|
|
if (_layer == null)
|
|
{
|
|
#if !__MOBILE__
|
|
Renderer.NativeView.WantsLayer = true;
|
|
#endif
|
|
_layer = Renderer.NativeView.Layer;
|
|
#if __MOBILE__
|
|
_isInteractive = Renderer.NativeView.UserInteractionEnabled;
|
|
#endif
|
|
}
|
|
|
|
OnUpdateNativeControl(_layer);
|
|
|
|
NativeControlUpdated?.Invoke(this, EventArgs.Empty);
|
|
Performance.Stop(reference);
|
|
}
|
|
}
|
|
}
|