FixPortal.FixAtdl.Wpf.Core 1.0.7

FixPortal.FixAtdl.Wpf

A .NET 10 WPF library that renders editable FIXatdl strategy forms from FixPortal.FixAtdl models. The library supplies the form; the host owns its window, application lifecycle and order submission.

The adapter supports all 15 FIXatdl control types, nested panel layouts, single and multiple list selections, editable dropdowns, state rules and parameter/strategy validation. Templates load automatically.

Both halves are the same strategy document rendered by the same code, in a host running WPF's Fluent theme in light and in dark. The library owns no palette: chrome resolves through the host's own brushes and styles, so an embedded panel follows whatever the host is running rather than painting over it. Run it yourself with the sample:

dotnet run --project samples/FixPortal.FixAtdl.Wpf.Sample

Read these first

• Usage guide — parse, host a panel, validation, theming, 957 read-back.
• API reference — AtdlPanel, EditViewModel, custom renderers.
• Core usage — loading XML and the headless model.

Both packages version together from the git tag; non-tag packs default to 1.0.0. See the changelog for the current release.

Use in a WPF application

Target net10.0-windows with UseWPF enabled. Install FixPortal.FixAtdl.Wpf from NuGet.org:

dotnet add package FixPortal.FixAtdl.Wpf

The package brings in FixPortal.FixAtdl.Wpf.Core, the platform-independent view-model, state-rule and validation layer. It in turn uses the headless FixPortal.FixAtdl core.

Related projects:

• FixPortal.FixAtdl — the .NET parser, model, validator and FIX-tag emitter.
• FixPortal.FixAtdl.Wpf.Core — the platform-independent layer published with this repository.
• @fix-portal/fixatdl-react (repository) — a separate React adapter; it is not a dependency of this WPF package.

See CONTRIBUTING.md for local builds and the credential-free public package restore path.

Register the adapter with your host's service collection:

services.AddFixAtdlWpf();

After parsing a strategy with FixPortal.FixAtdl, initialize its controls once using the core value provider. For a new order with no existing FIX values:

strategy.LoadInitialControlValues(FixFieldValueProvider.Empty);
var (view, editor) = AtdlPanel.Create(strategy, serviceProvider);
contentControl.Content = view;

Use FixPortal.FixAtdl.Wpf, FixPortal.FixAtdl.Wpf.Core.ViewModels, FixPortal.FixAtdl.Xml, FixPortal.FixAtdl.Model.Elements and FixPortal.FixAtdl.Fix. Create and use the panel on the WPF dispatcher thread. An editor owns mutable strategy state: use a separate strategy instance for each open editor. For order amendments, load the existing order through the core before creating the panel; the adapter preserves loaded control values.

Use AtdlPanel.Create(strategy, serviceProvider, isAmendment: true) or new EditViewModel(strategy, isAmendment: true) to enforce mutableOnCxlRpl="false". Immutable values stay disabled and reject direct assignments and state-rule changes. A radio group with an immutable selected member is also locked.

if (!editor.HasErrors)
{
    IReadOnlyDictionary<int, string> values = editor.ReadBackFixValues();
    IReadOnlyList<(int Tag, string Value)> grp = editor.ReadBackStrategyParametersGrp();
    // Direct tags and/or the 957–960 group; the host builds the order.
}

ControlViewModel implements INotifyDataErrorInfo. Parameter errors are available on each control, and editor.StrategyErrors contains strategy-level validation failures. ReadBackFixValues() throws if the editor has errors. Values use the parameter's FIX wire conversion, including enum mappings, boolean wire values and UTC clock values.

Clock controls use their core Clock_t.Clock and LocalMktTz settings. The time picker passes a time-only value to that boundary; it never chooses a date from the desktop's local clock. Configure the core clock before loading initial values when reproducible time behavior is needed.

Conformance scope

State-rule tests share Fixtures/Conformance/state-transitions.json with the headless core and React adapter. They cover initial false enabled/visible inversion, {NULL} clear/restore, ordinary value transitions, cascades and cycle rejection against FIXatdl 1.1 state-rule conventions i–v.

Radio controls sharing a parameter emit one FIX tag from the selected member; complementary mappings and null unchecked mappings are covered. Spinner buttons use the declared increment; Tick/LotSize policies fall back to that increment because the adapter has no instrument-data provider. Parameter limits block submission of invalid values; the buttons do not clamp them.

Sliders with ListItems render enumerated choices; sliders without ListItems render a continuous numeric range using parameter bounds and the declared increment. Percentage bounds are displayed in whole-percent units. Unset values stay unset during rendering and can be cleared explicitly. Without declared bounds, the numeric slider uses 0–100 (or the parameter type's minimum). If only a negative maximum or a minimum above 100 is declared, the missing opposite bound leaves a range of 100 display units, capped at decimal limits. The clock editor exposes hours and minutes; editing sets seconds to zero. Full FIXatdl conformance is not claimed: instrument data and cancel/replace message policy belong to the host. ReadBackStrategyParametersGrp() emits tags 957–960 from the current parameter values; combining them with direct tags and the rest of the order is still the host's.

Custom renderers

The default renderers are IControlRenderer services registered by AddFixAtdlWpf() and consumed as IEnumerable<IControlRenderer> by StrategyPanelRenderer, which keys them by ControlType (last registration wins) before handing the deduplicated set to WpfControlRenderer. To override one control type, implement IControlRenderer<T> for that Control_t and register it as an additional IControlRenderer in the host's service collection. An unrecognised broker control reaches the visitor fallback, which throws NotSupportedException naming the control type and id.

Troubleshooting

Build and release

Windows and the .NET 10 SDK are required for the WPF project and UI tests. The core project and its tests run without WPF. CI checks formatting, builds, tests both projects on Windows and packs both libraries.

Tags vMAJOR.MINOR.PATCH on commits reachable from main publish both packages to NuGet.org (and GitHub Packages) after CI succeeds. Creating a tag is a release action; ordinary branch and pull-request builds only produce artifacts.

The renderer creates and parses XAML. See SECURITY.md for its trust boundaries and vulnerability reporting.

Attribution

The control and layout code derives from Steve Wilkinson's MIT-licensed Atdl4net WPF implementation (2010–2011). FixPortal modifications are Apache-2.0 licensed. NOTICE preserves upstream attribution and the MIT terms; LICENSE contains the Apache-2.0 terms.