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Add VisualElementTracker to update frames

This commit is contained in:
Frank A. Krueger 2017-11-09 12:52:20 -08:00
parent 71611af1e2
commit e3627b5b90
3 changed files with 226 additions and 31 deletions
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32
Ooui.Forms/VisualElementRenderer.cs
View File

@ -8,6 +8,9 @@ namespace Ooui.Forms
{
public class VisualElementRenderer<TElement> : Ooui.Element, IVisualElementRenderer where TElement : VisualElement
{
bool disposedValue = false; // To detect redundant calls
VisualElementTracker _tracker;
readonly Color _defaultColor = Color.Clear;
readonly PropertyChangedEventHandler _propertyChangedHandler;
@ -62,10 +65,10 @@ namespace Ooui.Forms
if (element.BackgroundColor != Xamarin.Forms.Color.Default || (oldElement != null && element.BackgroundColor != oldElement.BackgroundColor))
SetBackgroundColor (element.BackgroundColor);
//if (_tracker == null) {
// _tracker = new VisualElementTracker (this);
// _tracker.NativeControlUpdated += (sender, e) => UpdateNativeWidget ();
//}
if (_tracker == null) {
_tracker = new VisualElementTracker (this);
_tracker.NativeControlUpdated += (sender, e) => UpdateNativeWidget ();
}
//if (AutoPackage && _packager == null) {
// _packager = new VisualElementPackager (this);
@ -130,37 +133,18 @@ namespace Ooui.Forms
element.SendViewInitialized (nativeView);
}
#region IDisposable Support
private bool disposedValue = false; // To detect redundant calls
protected virtual void Dispose (bool disposing)
{
if (!disposedValue) {
if (disposing) {
// TODO: dispose managed state (managed objects).
}
// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.
disposedValue = true;
}
}
// TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
// ~VisualElementRenderer() {
// // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
// Dispose(false);
// }
// This code added to correctly implement the disposable pattern.
public void Dispose ()
{
// Do not change this code. Put cleanup code in Dispose(bool disposing) above.
Dispose (true);
// TODO: uncomment the following line if the finalizer is overridden above.
// GC.SuppressFinalize(this);
}
#endregion
}
}
}

220
Ooui.Forms/VisualElementTracker.cs
View File

@ -1,12 +1,218 @@
namespace Ooui.Forms
{
internal class VisualElementTracker
{
private VisualElementRenderer<object> visualElementRenderer;
using System;
using System.ComponentModel;
using System.Threading;
using Xamarin.Forms;
using Xamarin.Forms.Internals;
public VisualElementTracker(VisualElementRenderer<object> visualElementRenderer)
namespace Ooui.Forms
{
this.visualElementRenderer = visualElementRenderer;
public class VisualElementTracker
{
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
int _updateCount;
public VisualElementTracker (IVisualElementRenderer renderer)
{
if (renderer == null)
throw new ArgumentNullException (nameof (renderer));
_propertyChangedHandler = HandlePropertyChanged;
_sizeChangedEventHandler = HandleSizeChanged;
_batchCommittedHandler = HandleRedrawNeeded;
Renderer = renderer;
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);
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.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)
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 ()
{
var view = Renderer.Element;
var uiview = Renderer.NativeView;
if (view == null || view.Batched)
return;
var shouldInteract = !view.InputTransparent && view.IsEnabled;
if (_isInteractive != shouldInteract) {
_isInteractive = shouldInteract;
}
var boundsChanged = _lastBounds != view.Bounds;
var viewParent = view.RealParent as VisualElement;
var parentBoundsChanged = _lastParentBounds != (viewParent == null ? Rectangle.Zero : viewParent.Bounds);
var thread = !boundsChanged;
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 width = (float)view.Width;
var height = (float)view.Height;
var x = (float)view.X;
var y = (float)view.Y;
var opacity = (float)view.Opacity;
var isVisible = view.IsVisible;
var updateTarget = Interlocked.Increment (ref _updateCount);
if (updateTarget != _updateCount)
return;
var parent = view.RealParent;
if (isVisible && uiview.IsHidden) {
uiview.IsHidden = false;
}
if (!isVisible && !uiview.IsHidden) {
uiview.IsHidden = true;
}
parentBoundsChanged = true;
bool shouldUpdate = width > 0 && height > 0 && parent != null && (boundsChanged || parentBoundsChanged);
if (shouldUpdate) {
var visualParent = parent as VisualElement;
float newY = visualParent == null ? y : Math.Max (0, (float)(visualParent.Height - y - view.Height));
var target = new Rectangle (x, newY, width, height);
uiview.Style.Left = x;
uiview.Style.Top = newY;
uiview.Style.Width = width;
uiview.Style.Height = height;
}
else if (width <= 0 || height <= 0) {
return;
}
uiview.Style.Opacity = opacity;
//var transform = 0;
//const double epsilon = 0.001;
//caLayer.AnchorPoint = new PointF (anchorX - 0.5f, anchorY - 0.5f);
//// 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 (scale - 1) > epsilon)
// transform = transform.Scale (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;
_lastBounds = view.Bounds;
_lastParentBounds = viewParent?.Bounds ?? Rectangle.Zero;
}
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 ()
{
if (_disposed)
return;
OnUpdateNativeControl ();
NativeControlUpdated?.Invoke (this, EventArgs.Empty);
}
}
}

5
Ooui/Style.cs
View File

@ -232,6 +232,11 @@ namespace Ooui
}
}
public Value Opacity {
get => this["opacity"];
set => this["opacity"] = value;
}
public Value Order {
get => this["order"];
set => this["order"] = value;