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RefreshViewRenderer.cs
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RefreshViewRenderer.cs
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using System;
using System.ComponentModel;
using Android.Content;
using Android.OS;
using Android.Views;
using Android.Widget;
using AndroidX.Core.View;
using AndroidX.Core.Widget;
using AndroidX.RecyclerView.Widget;
using AndroidX.SwipeRefreshLayout.Widget;
using Microsoft.Maui.Controls.Internals;
using Microsoft.Maui.Controls.Platform;
using Microsoft.Maui.Graphics;
using AView = Android.Views.View;
using AWebView = Android.Webkit.WebView;
namespace Microsoft.Maui.Controls.Compatibility.Platform.Android
{
public class RefreshViewRenderer : SwipeRefreshLayout, IVisualElementRenderer, IEffectControlProvider, SwipeRefreshLayout.IOnRefreshListener
{
bool _isDisposed;
bool _init;
bool _refreshing;
IVisualElementRenderer _renderer;
int? _defaultLabelFor;
public event EventHandler<VisualElementChangedEventArgs> ElementChanged;
public event EventHandler<PropertyChangedEventArgs> ElementPropertyChanged;
public RefreshViewRenderer(Context context)
: base(context)
{
}
public VisualElementTracker Tracker { get; private set; }
public AView View => this;
public SwipeRefreshLayout SwipeRefreshLayout => View as SwipeRefreshLayout;
public VisualElement Element { get; private set; }
public RefreshView RefreshView => Element != null ? (RefreshView)Element : null;
public override bool Refreshing
{
get
{
return _refreshing;
}
set
{
_refreshing = value;
if (RefreshView != null && RefreshView.IsRefreshing != _refreshing)
RefreshView.SetValueFromRenderer(RefreshView.IsRefreshingProperty, _refreshing);
base.Refreshing = _refreshing;
}
}
public override bool CanChildScrollUp() => CanScrollUp(_renderer.View);
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
base.OnLayout(changed, l, t, r, b);
var refreshViewContent = RefreshView?.Content;
if (refreshViewContent == null)
return;
IVisualElementRenderer renderer = Platform.GetRenderer(refreshViewContent);
renderer?.UpdateLayout();
}
public void SetElement(VisualElement element)
{
var oldElement = Element;
if (oldElement != null)
oldElement.PropertyChanged -= HandlePropertyChanged;
Element = element;
if (Element != null)
{
UpdateContent();
Element.PropertyChanged += HandlePropertyChanged;
}
if (!_init)
{
_init = true;
Tracker = new VisualElementTracker(this);
SetOnRefreshListener(this);
}
UpdateColors();
UpdateIsRefreshing();
UpdateIsEnabled();
ElementChanged?.Invoke(this, new VisualElementChangedEventArgs(oldElement, Element));
EffectUtilities.RegisterEffectControlProvider(this, oldElement, element);
}
void UpdateContent()
{
if (_renderer != null)
{
_renderer.View.RemoveFromParent();
_renderer.Dispose();
_renderer = null;
}
if (RefreshView.Content != null)
{
_renderer = Platform.CreateRenderer(RefreshView.Content, Context);
Platform.SetRenderer(RefreshView.Content, _renderer);
if (_renderer.View.Parent != null)
_renderer.View.RemoveFromParent();
using (var layoutParams = new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent))
SwipeRefreshLayout.AddView(_renderer.View, layoutParams);
}
}
void UpdateColors()
{
if (RefreshView == null)
return;
if (RefreshView.RefreshColor != null)
SetColorSchemeColors(RefreshView.RefreshColor.ToAndroid());
if (RefreshView.BackgroundColor != null)
SetProgressBackgroundColorSchemeColor(RefreshView.BackgroundColor.ToAndroid());
}
void UpdateIsRefreshing() => Refreshing = RefreshView.IsRefreshing;
void UpdateIsEnabled() => SwipeRefreshLayout.Enabled = RefreshView.IsEnabled;
bool CanScrollUp(AView view)
{
if (!(view is ViewGroup viewGroup))
return base.CanChildScrollUp();
if (Forms.SdkInt < BuildVersionCodes.JellyBean && viewGroup.IsScrollContainer)
return base.CanChildScrollUp();
if (!CanScrollUpViewByType(view))
return false;
for (int i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
if (!CanScrollUpViewByType(child))
return false;
if (child is SwipeRefreshLayout)
{
return CanScrollUp(child as ViewGroup);
}
}
return true;
}
bool CanScrollUpViewByType(AView view)
{
if (view is AbsListView absListView)
{
if (absListView.FirstVisiblePosition == 0)
{
var subChild = absListView.GetChildAt(0);
return subChild != null && subChild.Top != 0;
}
return true;
}
if (view is RecyclerView recyclerView)
return recyclerView.ComputeVerticalScrollOffset() > 0;
if (view is NestedScrollView nestedScrollView)
return nestedScrollView.ComputeVerticalScrollOffset() > 0;
if (view is AWebView webView)
return webView.ScrollY > 0;
return true;
}
public void OnRefresh()
{
Refreshing = true;
}
void HandlePropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == ContentView.ContentProperty.PropertyName)
UpdateContent();
else if (e.PropertyName == VisualElement.IsEnabledProperty.PropertyName)
UpdateIsEnabled();
else if (e.PropertyName == RefreshView.IsRefreshingProperty.PropertyName)
UpdateIsRefreshing();
else if (e.IsOneOf(RefreshView.RefreshColorProperty, VisualElement.BackgroundColorProperty, VisualElement.BackgroundProperty))
UpdateColors();
ElementPropertyChanged?.Invoke(sender, e);
}
public SizeRequest GetDesiredSize(int widthConstraint, int heightConstraint)
{
_renderer.View.Measure(widthConstraint, heightConstraint);
return new SizeRequest(new Size(_renderer.View.MeasuredWidth, _renderer.View.MeasuredHeight), new Size(100, 100));
}
public void UpdateLayout() => Tracker?.UpdateLayout();
protected override void Dispose(bool disposing)
{
if (_isDisposed)
return;
if (disposing)
{
if (Element != null)
{
Element.PropertyChanged -= HandlePropertyChanged;
}
SetOnRefreshListener(null);
_renderer?.View.RemoveFromParent();
_renderer?.Dispose();
_renderer = null;
Tracker?.Dispose();
Tracker = null;
_init = false;
}
_isDisposed = true;
base.Dispose(disposing);
}
public void SetLabelFor(int? id)
{
if (_defaultLabelFor == null)
{
_defaultLabelFor = ViewCompat.GetLabelFor(this);
}
ViewCompat.SetLabelFor(this, (int)(id ?? _defaultLabelFor));
}
void IEffectControlProvider.RegisterEffect(Effect effect)
{
if (effect is PlatformEffect platformEffect)
OnRegisterEffect(platformEffect);
}
void OnRegisterEffect(PlatformEffect effect)
{
effect.Container = this;
effect.Control = this;
}
}
}