tsai
/
Avalonia
mirror of https://github.com/AvaloniaUI/Avalonia.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

Nullability fixes for Avalonia.Controls.ItemsRepeater

pull/10256/head
Julien Lebosquain 4 years ago
parent
e1138f2cb6
commit
15f3b746a8
No known key found for this signature in database GPG Key ID: 1833CAD10ACC46FD
3 changed files with 42 additions and 80 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 93
      src/Avalonia.Controls.ItemsRepeater/Controls/ItemsRepeater.cs
  2. 15
      src/Avalonia.Controls.ItemsRepeater/Controls/ViewManager.cs
  3. 14
      src/Avalonia.Controls.ItemsRepeater/Controls/ViewportManager.cs

93
src/Avalonia.Controls.ItemsRepeater/Controls/ItemsRepeater.cs
View File

@ -44,8 +44,8 @@ namespace Avalonia.Controls
/// <summary>
/// Defines the <see cref="Layout"/> property.
/// </summary>
public static readonly StyledProperty<AttachedLayout> LayoutProperty =
AvaloniaProperty.Register<ItemsRepeater, AttachedLayout>(nameof(Layout), new StackLayout());
public static readonly StyledProperty<AttachedLayout?> LayoutProperty =
AvaloniaProperty.Register<ItemsRepeater, AttachedLayout?>(nameof(Layout), new StackLayout());
/// <summary>
/// Defines the <see cref="VerticalCacheLength"/> property.
@ -53,8 +53,8 @@ namespace Avalonia.Controls
public static readonly StyledProperty<double> VerticalCacheLengthProperty =
AvaloniaProperty.Register<ItemsRepeater, double>(nameof(VerticalCacheLength), 2.0);
private static readonly StyledProperty<VirtualizationInfo> VirtualizationInfoProperty =
AvaloniaProperty.RegisterAttached<ItemsRepeater, Control, VirtualizationInfo>("VirtualizationInfo");
private static readonly StyledProperty<VirtualizationInfo?> VirtualizationInfoProperty =
AvaloniaProperty.RegisterAttached<ItemsRepeater, Control, VirtualizationInfo?>("VirtualizationInfo");
internal static readonly Rect InvalidRect = new Rect(-1, -1, -1, -1);
internal static readonly Point ClearedElementsArrangePosition = new Point(-10000.0, -10000.0);
@ -63,7 +63,7 @@ namespace Avalonia.Controls
private readonly ViewportManager _viewportManager;
private readonly TargetWeakEventSubscriber<ItemsRepeater, EventArgs> _layoutWeakSubscriber;
private IEnumerable? _items;
private VirtualizingLayoutContext? _layoutContext;
private RepeaterLayoutContext? _layoutContext;
private EventHandler<ChildIndexChangedEventArgs>? _childIndexChanged;
private bool _isLayoutInProgress;
private NotifyCollectionChangedEventArgs? _processingItemsSourceChange;
@ -104,7 +104,7 @@ namespace Avalonia.Controls
/// The layout used to size and position elements. The default is a StackLayout with
/// vertical orientation.
/// </value>
public AttachedLayout Layout
public AttachedLayout? Layout
{
get => GetValue(LayoutProperty);
set => SetValue(LayoutProperty, value);
@ -164,18 +164,7 @@ namespace Avalonia.Controls
private bool IsProcessingCollectionChange => _processingItemsSourceChange != null;
private LayoutContext LayoutContext
{
get
{
if (_layoutContext == null)
{
_layoutContext = new RepeaterLayoutContext(this);
}
return _layoutContext;
}
}
private RepeaterLayoutContext LayoutContext => _layoutContext ??= new RepeaterLayoutContext(this);
event EventHandler<ChildIndexChangedEventArgs>? IChildIndexProvider.ChildIndexChanged
{
@ -269,39 +258,22 @@ namespace Avalonia.Controls
internal void UnpinElement(Control element) => _viewManager.UpdatePin(element, false);
internal static VirtualizationInfo? TryGetVirtualizationInfo(Control element)
internal static VirtualizationInfo? TryGetVirtualizationInfo(Control? element)
{
return (element as AvaloniaObject)?.GetValue(VirtualizationInfoProperty);
}
internal static VirtualizationInfo CreateAndInitializeVirtualizationInfo(Control element)
{
if (TryGetVirtualizationInfo(element) != null)
{
throw new InvalidOperationException("VirtualizationInfo already created.");
}
var result = new VirtualizationInfo();
element.SetValue(VirtualizationInfoProperty, result);
return result;
return element?.GetValue(VirtualizationInfoProperty);
}
internal static VirtualizationInfo GetVirtualizationInfo(Control element)
{
if (element is AvaloniaObject ao)
{
var result = ao.GetValue(VirtualizationInfoProperty);
if (result == null)
{
result = new VirtualizationInfo();
ao.SetValue(VirtualizationInfoProperty, result);
}
var result = element.GetValue(VirtualizationInfoProperty);
return result;
if (result == null)
{
result = new VirtualizationInfo();
element.SetValue(VirtualizationInfoProperty, result);
}
throw new NotSupportedException("Custom implementations of AvaloniaObject not supported.");
return result;
}
private protected override void InvalidateMeasureOnChildrenChanged()
@ -309,6 +281,7 @@ namespace Avalonia.Controls
// Don't invalidate measure when children change.
}
/// <inheritdoc />
protected override Size MeasureOverride(Size availableSize)
{
if (_isLayoutInProgress)
@ -334,7 +307,7 @@ namespace Avalonia.Controls
if (layout != null)
{
var layoutContext = GetLayoutContext();
var layoutContext = LayoutContext;
desiredSize = layout.Measure(layoutContext, availableSize);
extent = new Rect(LayoutOrigin.X, LayoutOrigin.Y, desiredSize.Width, desiredSize.Height);
@ -364,6 +337,7 @@ namespace Avalonia.Controls
}
}
/// <inheritdoc />
protected override Size ArrangeOverride(Size finalSize)
{
if (_isLayoutInProgress)
@ -380,7 +354,7 @@ namespace Avalonia.Controls
try
{
var arrangeSize = Layout?.Arrange(GetLayoutContext(), finalSize) ?? default;
var arrangeSize = Layout?.Arrange(LayoutContext, finalSize) ?? default;
// The view manager might clear elements during this call.
// That's why we call it before arranging cleared elements
@ -421,6 +395,7 @@ namespace Avalonia.Controls
}
}
/// <inheritdoc />
protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
{
base.OnAttachedToVisualTree(e);
@ -428,11 +403,13 @@ namespace Avalonia.Controls
_viewportManager.ResetScrollers();
}
/// <inheritdoc />
protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
{
_viewportManager.ResetScrollers();
}
/// <inheritdoc />
protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
{
if (change.Property == ItemsProperty)
@ -501,7 +478,7 @@ namespace Avalonia.Controls
if (parent == this)
{
var virtInfo = TryGetVirtualizationInfo(element);
return _viewManager.GetElementIndex(virtInfo!);
return _viewManager.GetElementIndex(virtInfo);
}
return -1;
@ -529,7 +506,7 @@ namespace Avalonia.Controls
{
if (index >= 0 && index >= (ItemsSourceView?.Count ?? 0))
{
throw new ArgumentException("Argument index is invalid.", "index");
throw new ArgumentException("Argument index is invalid.", nameof(index));
}
if (_isLayoutInProgress)
@ -547,7 +524,7 @@ namespace Avalonia.Controls
throw new InvalidOperationException("Cannot make an Anchor when there is no attached layout.");
}
element = (Control)GetLayoutContext().GetOrCreateElementAt(index);
element = (Control)LayoutContext.GetOrCreateElementAt(index);
element.Measure(Size.Infinity);
}
@ -647,9 +624,9 @@ namespace Avalonia.Controls
if (Layout is VirtualizingLayout virtualLayout)
{
virtualLayout.OnItemsChanged(GetLayoutContext(), newValue, args);
virtualLayout.OnItemsChanged(LayoutContext, newValue, args);
}
else if (Layout is NonVirtualizingLayout nonVirtualLayout)
else if (Layout is NonVirtualizingLayout)
{
// Walk through all the elements and make sure they are cleared for
// non-virtualizing layouts.
@ -693,7 +670,7 @@ namespace Avalonia.Controls
try
{
virtualLayout.OnItemsChanged(GetLayoutContext(), newValue, args);
virtualLayout.OnItemsChanged(LayoutContext, newValue, args);
}
finally
{
@ -760,7 +737,7 @@ namespace Avalonia.Controls
AttachedLayout.ArrangeInvalidatedWeakEvent.Subscribe(newValue, _layoutWeakSubscriber);
}
bool isVirtualizingLayout = newValue != null && newValue is VirtualizingLayout;
bool isVirtualizingLayout = newValue is VirtualizingLayout;
_viewportManager.OnLayoutChanged(isVirtualizingLayout);
InvalidateMeasure();
}
@ -788,7 +765,7 @@ namespace Avalonia.Controls
{
if (Layout is VirtualizingLayout virtualLayout)
{
virtualLayout.OnItemsChanged(GetLayoutContext(), sender, args);
virtualLayout.OnItemsChanged(LayoutContext, sender, args);
}
else
{
@ -807,15 +784,5 @@ namespace Avalonia.Controls
{
_viewportManager.OnBringIntoViewRequested(e);
}
private VirtualizingLayoutContext GetLayoutContext()
{
if (_layoutContext == null)
{
_layoutContext = new RepeaterLayoutContext(this);
}
return _layoutContext;
}
}
}

15
src/Avalonia.Controls.ItemsRepeater/Controls/ViewManager.cs
View File

@ -53,7 +53,7 @@ namespace Avalonia.Controls
}
}
}
if (element == null) { element = GetElementFromUniqueIdResetPool(index); };
if (element == null) { element = GetElementFromUniqueIdResetPool(index); }
if (element == null) { element = GetElementFromPinnedElements(index); }
if (element == null) { element = GetElementFromElementFactory(index); }
@ -221,7 +221,7 @@ namespace Avalonia.Controls
return nextElement;
}
public int GetElementIndex(VirtualizationInfo virtInfo)
public int GetElementIndex(VirtualizationInfo? virtInfo)
{
if (virtInfo == null)
{
@ -627,11 +627,7 @@ namespace Avalonia.Controls
var element = GetElement();
var virtInfo = ItemsRepeater.TryGetVirtualizationInfo(element);
if (virtInfo == null)
{
virtInfo = ItemsRepeater.CreateAndInitializeVirtualizationInfo(element);
}
var virtInfo = ItemsRepeater.GetVirtualizationInfo(element);
// Clear flag
virtInfo.MustClearDataContext = false;
@ -710,9 +706,8 @@ namespace Avalonia.Controls
{
if (parent is ItemsRepeater repeater)
{
var element = child as Control;
if (repeater == owner &&
element is not null &&
child is Control element &&
ItemsRepeater.GetVirtualizationInfo(element).IsRealized)
{
focusedElement = element;
@ -722,7 +717,7 @@ namespace Avalonia.Controls
}
child = parent;
parent = child?.GetVisualParent();
parent = child.GetVisualParent();
}
}

14
src/Avalonia.Controls.ItemsRepeater/Controls/ViewportManager.cs
View File

@ -166,7 +166,7 @@ namespace Avalonia.Controls
if (Math.Abs(_expectedViewportShift.X) > 1 || Math.Abs(_expectedViewportShift.Y) > 1)
{
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Expecting viewport shift of ({Shift})",
_owner.Layout.LayoutId, _expectedViewportShift);
_owner.Layout?.LayoutId, _expectedViewportShift);
// There are cases where we might be expecting a shift but not get it. We will
// be waiting for the effective viewport event but if the scroll viewer is not able
@ -287,7 +287,7 @@ namespace Avalonia.Controls
if (_pendingViewportShift.X != 0 || _pendingViewportShift.Y != 0)
{
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Layout Updated with pending shift {Shift}- invalidating measure",
_owner.Layout.LayoutId,
_owner.Layout?.LayoutId,
_pendingViewportShift);
// Assume this is never going to come.
@ -436,7 +436,7 @@ namespace Avalonia.Controls
private void OnEffectiveViewportChanged(object? sender, EffectiveViewportChangedEventArgs e)
{
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: EffectiveViewportChanged event callback", _owner.Layout.LayoutId);
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: EffectiveViewportChanged event callback", _owner.Layout?.LayoutId);
UpdateViewport(e.EffectiveViewport);
_pendingViewportShift = default;
@ -490,14 +490,14 @@ namespace Avalonia.Controls
var previousVisibleWindow = _visibleWindow;
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Effective Viewport: ({Before})->({After})",
_owner.Layout.LayoutId,
_owner.Layout?.LayoutId,
previousVisibleWindow,
viewport);
if (-currentVisibleWindow.X <= ItemsRepeater.ClearedElementsArrangePosition.X &&
-currentVisibleWindow.Y <= ItemsRepeater.ClearedElementsArrangePosition.Y)
{
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Viewport is invalid. visible window cleared", _owner.Layout.LayoutId);
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Viewport is invalid. visible window cleared", _owner.Layout?.LayoutId);
// We got cleared.
_visibleWindow = default;
}
@ -509,7 +509,7 @@ namespace Avalonia.Controls
if (_visibleWindow != previousVisibleWindow)
{
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Used Viewport: ({Before})->({After})",
_owner.Layout.LayoutId,
_owner.Layout?.LayoutId,
previousVisibleWindow,
currentVisibleWindow);
TryInvalidateMeasure();
@ -532,7 +532,7 @@ namespace Avalonia.Controls
// We invalidate measure instead of just invalidating arrange because
// we don't invalidate measure in UpdateViewport if the view is changing to
// avoid layout cycles.
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Invalidating measure due to viewport change", _owner.Layout.LayoutId);
Logger.TryGet(LogEventLevel.Verbose, "Repeater")?.Log(this, "{LayoutId}: Invalidating measure due to viewport change", _owner.Layout?.LayoutId);
_owner.InvalidateMeasure();
}
}

Write Preview
Loading…
Cancel
Save