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feat: add opt-in RevertOnFalse support for data triggers - #349

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wieslawsoltes merged 19 commits into
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DamirLisak:master
Aug 19, 2026
Merged

wieslawsoltes merged 19 commits into
wieslawsoltes:masterfrom
DamirLisak:master

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@DamirLisak

@DamirLisak DamirLisak commented May 28, 2026 •

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Summary

Adds opt-in reversible execution to DataTriggerBehavior and MultiDataTriggerBehavior. When RevertOnFalse is enabled, actions run on the false-to-true transition and reversible actions restore state on the true-to-false transition. The default remains false, so existing trigger behavior is unchanged.

Implementation

  • adds the documented RevertOnFalse styled property to both trigger types
  • introduces the focused IReversibleAction contract
  • makes ChangePropertyAction snapshot and restore readable CLR and Avalonia properties
  • preserves Avalonia binding/style value sources by using current-value updates
  • keeps write-only CLR properties executable while correctly reporting that they cannot be reverted
  • reverts multi-action collections in reverse application order
  • coordinates overlapping reversible actions per target/property so removing an earlier trigger does not overwrite a later active trigger
  • clears property coordination state after the last active action reverts

Validation

  • compiled XAML coverage for DataTrigger and MultiDataTrigger opt-in behavior
  • regression coverage for Avalonia styled-value source preservation
  • regression coverage for write-only CLR properties
  • regression coverage for action-order reversal
  • regression coverage for both overlapping-trigger reversion orders
  • local focused suite: 12 passed
  • local full Interactions suite: 53 passed, 2 pre-existing skips
  • GitHub Actions: Ubuntu, macOS, and Windows validation requested

Compatibility

This is additive and backward compatible. Triggers retain their previous one-way behavior unless RevertOnFalse is explicitly enabled.

Closes #348

add a new RevertOnFalse option to DataTriggerBehavior (default is false)
keep old behavior unchanged when RevertOnFalse is false
when RevertOnFalse is true:
execute actions when condition changes from false to true
revert reversible actions when condition changes from true to false
add the same RevertOnFalse option to MultiDataTriggerBehavior
introduce reversible action support and implement it for ChangePropertyAction
this is backward compatible and non-breaking by default
@wieslawsoltes

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Comment thread src/Xaml.Behaviors.Interactivity/Helpers/PropertyHelper.cs
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@DamirLisak

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@wieslawsoltes thanks for the code review! Do I need to do anything else now, or are the suggested changes from Codex already implemented?

@wieslawsoltes
wieslawsoltes merged commit 66d3606 into wieslawsoltes:master Aug 19, 2026
@DamirLisak

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@wieslawsoltes 🙏👍

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Feature request: opt-in RevertOnFalse for DataTriggerBehavior and MultiDataTriggerBehavior

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