* Reminder for future me.
* Move compiled bindings to Avalonia base.
* Update suppressions.
* Tweaked `BindingExpressionVisitor`.
And documented public (internal) API.
* Fix ncrunch config.
* Add comprehensive unit tests for BindingExpressionVisitor.
Tests cover all supported features including property access, indexers,
AvaloniaProperty access, logical NOT, stream bindings, and type operators.
Also includes tests for unsupported operations that should throw exceptions.
Discovered bug: IsAssignableFrom check at line 139 is backwards, causing
upcasts to incorrectly throw and downcasts to be incorrectly ignored.
Bug is documented with skipped tests showing expected behavior and passing
tests documenting current broken behavior.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Fix backwards IsAssignableFrom check in BindingExpressionVisitor.
Fixed the inheritance cast check which was inverted, causing:
- Upcasts (derived→base) to incorrectly throw exceptions
- Downcasts (base→derived) to be incorrectly ignored
Changed line 139 from:
node.Operand.Type.IsAssignableFrom(node.Type)
to:
node.Type.IsAssignableFrom(node.Operand.Type)
This correctly identifies safe upcasts (which are ignored) vs unsafe
downcasts (which throw exceptions).
Updated tests to remove skip attributes and removed the temporary tests
that documented the broken behavior. All 33 tests now pass.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Allow downcasts and all reference type casts in binding expressions.
Changed the cast handling to allow both upcasts and downcasts for reference
types. This makes casts actually useful in binding expressions while still
rejecting value type conversions that would require actual conversion logic.
The logic now checks:
- Both types must be reference types (not value types)
- One type must be assignable to/from the other (either direction)
This allows practical scenarios like:
- Upcasts: (BaseClass)derived
- Downcasts: (DerivedClass)baseInstance
- Casting through object: (TargetType)(object)source
The binding system will gracefully handle any runtime type mismatches.
Updated tests to verify downcasts are allowed and added test for casting
through object pattern.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Add clarifying test for cast transparency in binding expressions.
Added test showing that casts are transparent in property chains.
For example, ((TestClass)x).Property produces just one node for the
property access - the cast doesn't create additional nodes.
This clarifies that empty nodes for (TestClass)x is correct behavior:
- Empty nodes = bind to source directly
- The cast is just a type annotation, transparent to the binding path
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Fix: Casts should create ReflectionTypeCastNode, not be transparent.
Casts were incorrectly being treated as transparent (not creating nodes),
but CompiledBindingPath uses TypeCastPathElement which creates FuncTransformNode.
For consistency and correctness, BindingExpressionVisitor should also create
cast nodes using ReflectionTypeCastNode.
Changes:
- Convert expressions now create ReflectionTypeCastNode
- TypeAs expressions now create ReflectionTypeCastNode
- Both upcasts and downcasts create nodes (runtime checks handle failures)
Examples:
- x => (TestClass)x → 1 node (cast)
- x => ((TestClass)x).Prop → 2 nodes (cast + property)
- x => x.Child as object → 2 nodes (property + cast)
This matches the behavior of CompiledBindingPathBuilder.TypeCast<T>().
Updated all related tests to verify cast nodes are created.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Use compiled cast functions instead of reflection-based type checks.
Changed from ReflectionTypeCastNode (which uses Type.IsInstanceOfType) to
FuncTransformNode with a compiled cast function. This matches how
CompiledBindingPath handles TypeCastPathElement and provides better
performance by avoiding reflection.
The CreateCastFunc method compiles an expression `(object? obj) => obj as T`
which generates efficient IL similar to the 'is T' pattern used in
TypeCastPathElement<T>, rather than using reflection-based type checks.
Performance improvement:
- Before: Type.IsInstanceOfType() reflection call for each cast
- After: Compiled IL using 'as' operator (same as TypeCastPathElement<T>)
Updated tests to expect FuncTransformNode instead of ReflectionTypeCastNode.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Reuse TypeCastPathElement<T> cast function directly.
Instead of compiling our own cast expression, extract the Cast delegate
directly from TypeCastPathElement<T>. This ensures we use the exact same
code path as CompiledBindingPath, avoiding any potential behavioral
differences and code duplication.
Benefits:
- Code reuse - single implementation of cast logic
- Consistency - same behavior as CompiledBindingPathBuilder.TypeCast<T>()
- No duplicate expression compilation logic
Implementation uses reflection to create the closed generic type and
extract the pre-compiled Cast delegate, which is still more efficient
than reflection-based type checks at runtime.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Revert to lambda compilation approach for cast functions.
Reverted from using TypeCastPathElement<T> back to compiling lambda
expressions directly. The lambda approach is cleaner and more straightforward:
Benefits of lambda compilation:
- No Activator.CreateInstance call (avoids reflection for construction)
- More direct - creates exactly what we need
- No coupling to TypeCastPathElement internal implementation
- Simpler code flow
The compiled lambda generates the same efficient IL code (using 'as' operator)
as TypeCastPathElement<T> does, just without the indirection.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Code cleanup: Fix XML docs and remove unused usings.
- Changed CreateCastFunc XML docs to use <remarks> tag for better formatting
- Removed unused 'using Avalonia.Data;' from tests
- Removed redundant '#nullable enable' from tests
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Refactor BindingExpressionVisitor to use CompiledBindingPathBuilder.
Changes BindingExpressionVisitor to use CompiledBindingPathBuilder instead of
directly creating ExpressionNode instances, unifying the approach with
compile-time XAML bindings. Adds new BuildPath() method that returns
CompiledBindingPath, while maintaining backwards compatibility through the
existing BuildNodes() wrapper method.
Key changes:
- Replace internal List<ExpressionNode> with CompiledBindingPathBuilder
- Refactor all visitor methods to call builder methods
- Add accessor factory methods and implementations for property access
- Support AvaloniaProperty, CLR properties, arrays, indexers, streams, casts
- Update tests to expect PropertyAccessorNode, StreamNode, ArrayIndexerNode
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Remove CompiledBindingPathFromExpressionBuilder in favor of BindingExpressionVisitor.
Now that BindingExpressionVisitor has been refactored to use
CompiledBindingPathBuilder and provides a BuildPath() method, the test-only
CompiledBindingPathFromExpressionBuilder class is redundant and can be removed.
Changes:
- Replace CompiledBindingPathFromExpressionBuilder.Build() with
BindingExpressionVisitor<TIn>.BuildPath() in BindingExpressionTests
- Delete CompiledBindingPathFromExpressionBuilder.cs test file
- All 122 tests in BindingExpressionTests.Compiled continue to pass
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Move test-only methods from production code to test extensions.
Removes BindingExpression.Create and BindingExpressionVisitor.BuildNodes
from production code since they were only used by unit tests.
Changes:
- Remove BindingExpression.Create<TIn, TOut> method
- Remove BindingExpressionVisitor.BuildNodes method
- Add BindingExpressionVisitorExtensions in Base.UnitTests
- Add BindingExpressionExtensions in LeakTests
- Add static helper methods in test classes to reduce noise
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Add public CompiledBinding.Create factory methods from LINQ expressions.
Adds two static factory methods to create CompiledBinding instances from
lambda expressions using BindingExpressionVisitor.BuildPath():
- Create<TIn, TOut>(expression, converter, mode)
Creates binding without explicit source (uses DataContext)
- Create<TIn, TOut>(source, expression, converter, mode)
Creates binding with explicit source
This provides a type-safe, ergonomic API for creating compiled bindings
from code without string-based paths.
Usage:
var binding = CompiledBinding.Create(viewModel, vm => vm.Title);
textBlock.Bind(TextBlock.TextProperty, binding);
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* Merge CompiledBinding.Create overloads and add all binding property parameters.
Consolidates the two Create method overloads into a single method with source
as an optional parameter. Adds optional parameters for all CompiledBinding
properties (priority, converterCulture, converterParameter, fallbackValue,
stringFormat, targetNullValue, updateSourceTrigger, delay) per PR feedback.
Properties that default to AvaloniaProperty.UnsetValue (source, fallbackValue,
targetNullValue) use null-coalescing to convert null parameter values.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
* (Re-)update suppressions.
* Add missing using.
* Fix ncrunch build.
* Remove file I committed by accident.
* PR feedback.
* Store static members outside generic class.
Based on PR feedback.
---------
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
* Update to xunit.v3
* Little more progress
* More fixes
* Keep VSTest supported
* Adjust Nuke
* Few fixes
* Fix for xunit 2
* Fix GetData override
* Adjust
* Use MTP for xunit 2
* Fix test
* Better fix
* --no-progress
* Few more fixes
* no progress
* Fix test
* Better fix
* TRX
* Move to Directory.Build.props
* Unify on MTP v2
* Update
* Update to stable
* 1.0.1
* 1.0.2
* Fix some warnings
* Fix more warnings
* Fix more warnings
* Enable nullability in RenderTests
* Enable nullability in LeakTests
* Enable nullability in Skia.UnitTests
* Enable nullability in Generators.Tests
* Enable nullability in DesignerSupport.Tests
* Enable nullability in Build.Tasks.UnitTests
* Remove netstandard2.0 from almost all projects
* Fix duplicated target frameworks in unit tests
* Fix DesignerSupport tests
* Fix Designer.HostApp packaging
* Build ControlCatalog.Desktop on CI
* Fix another bad auto merge
* Fix LeakTests duplicated target frameworks
* Don't hardcode target framework in DesignerSupportTests
* removed duplicated code between Window.Show and Window.ShowDialog
* Handling different cases of window initial position and size + unit test
* positioning cursor on resize grip in WindowOrder_Modal_Dialog_Stays_InFront_Of_Parent_When_Clicking_Resize_Grip test
* Fix for flaky test
* displaying decimal digits of slider value to avoid some issues with rounding
---------
Co-authored-by: Herman Kirshin <herman.kirshin@jetbrains.com>
* Add Points binding observability support for Polygon and Polyline
* Add simple tests for Polygon and Polyline Points updating
* Revert "Add Points binding observability support for Polygon and Polyline"
This reverts commit e16d987945.
* Move Geometry.Changed handler to Shape class to make it available to all inheritors
* Fixes the event subscriptions
* Fix tests
* Add memory leak tests
* Update ncrunch config.
* WIP: Benchmarks
* Initial refactor of binding infrastructure.
- `ExpressionObserver` has been removed and its functionality merged with `BindingExpression`
- `BindingExpression` handles all types of `BindingMode` itself; doesn't require `BindingOperations.Apply` to set up a separate observable for `TwoWay/`OneWayToSource` bindings
- This allows us to fix some long-standing issues with `OneWayToSource` bindings
- Expression nodes have been refactored
- No longer split between `Avalonia.Base` and `Avalonia.Markup`
- Categorize them according to whether they use reflection or not
A few tests are failing around binding warnings: this is because the next step here is to fix binding warnings.
* Make default binding Source = UnsetProperty.
Null is a theoretically valid value for `Source`; setting it to null shouldn't mean "use the data context".
* Move logging to BindingExpression.
As `BindingExpression` now has enough information to decide when it's appropriate to log an error/warning or not.
Fixes#5762Fixes#9422
* Add compatibility hack for older compiled bindings.
Previously, `CompiledBindingPathBuilder` didn't have a `TemplatedParent` method and instead the XAML compiler rewrite templated parent bindings to be a `$self.TemplateParent` property binding. resulting in extraneous logs.
Add a constructor with an `apiVersion` to `CompiledBindingPathBuilder` which will be used by newer versions of the XAML compiler, and if a usage is detected using an `apiVersion` of 0, then upgrade `$self.TemplatedParent` to use a `TemplatedParentPathElement`.
* Log errors from property accessors.
* Don't log errors for named control bindings...
...on elements which aren't yet rooted.
* Log errors for failed conversions.
* Use consistent wording for binding warnings.
"Could not convert" instead of "Cannot convert".
* Log warnings for converter exceptions.
* Don't convert new TargetTypeConverters each time.
* Added failing test for implicit conversion.
* Support cast operators in compiled bindings.
A bit of a hack as we'd ideally not be using reflection when using compiled bindings.
* This shouldn't be a public API.
Should only be used for tests.
* Make enum/int conversion work.
* Check for SetValue equality after conversion.
And also use "identity equals" where value types and strings use `object.Equals` and reference types use `object.ReferenceEquals`.
* Added ConverterCulture back to bindings.
* Fix merge error.
Removed deleted files from csproj that were re-added due to indentation changes.
* Use BindingExpression directly in ValueStoe.
* Introduce BindingExpressionBase.
And `UntypedBindingExpressionBase`.
* Make TemplateBinding a BindingExpression.
* Make DynamicResource use a BindingExpression.
* WIP: Start exposing a BindingExpression API.
* Finish exposing a BindingExpression API.
* Fix OneTimeBinding.
* Remove unneeded classes/methods.
* Don't call obsolete API.
* Make BindingExpressionBase the public API.
This matches WPF's API.
* Added BindingExpressionBase.UpdateTarget.
* Initial implementation of UpdateSourceTrigger.
* Don't use weak references for values.
If they're boxed values, they can get collected.
* No need for virtual/generic methods here now.
* Reintroduce support for binding anchors.
Turns out these were needed by animations, just our animation system has no unit tests so I missed that fact earlier. Add a basic animation unit test that fails without anchor support, and add binding anchors back in. Currently a private API as I suspect this feature shouldn't be needed outside the framework.
* Include new property in clone.
And add real-life example of `UpdateSourceTrigger=LostFocus` to BindingDemo.
* Fix merge error.
* Updated BindingExpression tests.
- Make them run for both compiled and reflection bindings (found a bunch of tests that fail with compiled bindings)
- Make them not depend on converting the `BindingExpression` to an observable and instead test the end result of the binding on an `AvaloniaObject`
* Fix compiled binding indexer tests.
* Use data validation plugins in PropertyAccessorNode.
Added a warning suppression for now: we may need a separate `DataValidators` list for AOT-friendly plugins.
* Don't separate plugins by reflection.
`DataAnnotationsValidationPlugin` is public and so it can't be moved. No point in moving the others if this one will be in the wrong place.
* Remove unneeded methods.
* Make reflection binding tests use a string.
Convert the `System.Linq.Expression` to a string and then use this, as reflection bindings will always be instanced with a string path.
* Added TODO12 plan for IBinding2.
* Use more specific exception.
* Fix nits from code review.
* Make expression nodes sealed where possible.
* Unsubscribe on Stop, don't re-subscribe.
D'oh.
* Tweak ExpressionNode lists.
Saves a few K in benchmarks and it's a cleaner API.
* Add a pooled option in BindingExpressionGrammar.
Micro-optimization.
* Avoid allocations when enumerating binding plugins.
* Add IBinding2 support to observable bind overloads.
In the case of `TemplateBinding`, the `IObservable<object?>` bind overload is selected by C#. Add an explicit check for an `IBinding2` here to use the more performant code-path.
* Remove disposed binding from ImmediateBindingFrame.
* Added TemplateBinding benchmarks.
* Remove duplicate items.
Seems to have been caused by a merge error.
* Fix exception when closing color picker.
And add tests.
* Don't skip converter when binding to self.
* Don't pass UnsetValue to converters.
This follows WPF behavior.
* Log element name if present.
More useful than just logging the control hash code.
* Respect binding priority.
* Throw on mismatched binding priorities.
We don't want to respect the binding priority in this case as it breaks `TemplateBindings` when the default `LocalValue` priority is passed. Instead make sure that the priority parameter matches that of the expression.
This reverts commit a72765d705.
* Convert to target type in TemplateBinding.
* Short-circuit target type conversion for same types.
- animation/layout/render cycle is now managed from a central location
- animations are now throttled if animation/layout/render pass takes longer than a frame which previously caused a soft-freeze with input not being processed
- the public API is trimmed to make sure that we can make other planned changes during the 11.x support cycle
"Changelog":
- IClock is hidden and is planned to be replaced later
- Animator classes are hidden and are planned to be refactored later
- IAnimation members are hidden, it's supposed to be a marker interface for Style.Animations collection now, to start animations manually use Animation.RunAsync
- Sealed several classes in Avalonia.Animation namespace
- Spring class is removed from the public API (it wasn't possible to use it directly in a meaningful way anyway)
- Sealed brushes, transforms, effects and drawings
- Removed separate dispatcher priorities for Layout and Composition, everything now happens from a central place with Render priority (same as WPF)
- - some private "hook" priorities are added for now, those will be removed later
- IRenderLoop is hidden and removed from locator
- IRenderer is hidden (the plan is to remove that concept later)
- - Renderer.Start/Stop exposed as StartRendering/StopRendering on the toplevel (will be on a CompositionTarget/PresentationSource-like type later)
- - Renderer.Diagnistics exposed as RendererDiagnostics (same)
- - Renderer is no longer created by the platform code and is created by TopLevel itself
- - From the user-code hit-testing should be done by VisualExtensions.GetVisual(s)At, which has the same features
- - For unit tests a separate IHitTester interface is added which can be changed for a particular toplevel
- ILayoutManager is hidden
- - LayoutManager.ExecuteLayoutPass() exposed as TopLevel.UpdateLayout()
- Custom animators now have a separate base class that only deals with interpolation
Minor improvements:
- Compositor has a mode that doesn't use DispatcherTimers, useful for unit tests
- Introduced ScopedTestBase that auto-resets the locator when test is finished
- Check `CanFocus` in `FocusManager.SetFocusedElement`
- Check for `IsEffectivelyVisible` in `CanFocus`
- Clear focus when control made invisible
- Update tests that relied on unfocusable controls being focused
* Add Loaded/Unloaded events
* Don't allow OnLoaded() twice unless OnUnloaded() is called
* Call OnLoadedCore within Render()
* Call OnLoadedCore() from OnAttachedToVisualTreeCore by scheduling it on the dispatcher
* Improve comments
* Queue loaded events
* Make the loaded queue static
* Make more members static per review
* Make sure control wasn't already scheduling for Loaded event
* Add locks around HashSet usage for when enumerating
* Remove from loaded queue in OnUnloadedCore() as failsafe
* Make Window raise its own Loaded/Unloaded events
* Attempt to fix leak tests to work with Loaded events
* Make WindowBase raise its own Loaded/Unloaded events
* Move hotkey leak tests to the LeakTest project
* Address some code review comments
* Attempt at actually queueing Loaded events again
* Fix typo
* Minor improvements
* Update controls benchmark
Co-authored-by: Max Katz <maxkatz6@outlook.com>
Co-authored-by: Jumar Macato <16554748+jmacato@users.noreply.github.com>
Steven Kirk
Julien Lebosquain
Youssef Victor
pavelovcharov
Ilya Pospelov
Emmanuel Hansen
Nikita Tsukanov
Herman K.
SKProCH
Max Katz
adirh
flexxxxer
José Pedro
Steven Kirk
robloo