xaml-csharp-development-skill-for-avalonia

WinUI Text Editing, IME, Undo/Redo, and InputScope to Avalonia

Table of Contents

1. Scope and APIs
2. Concept Mapping
3. Conversion Example
4. Migration Notes

Scope and APIs

Primary WinUI APIs:

• TextBox, SelectionStart, SelectionLength, CanUndo, Undo, Redo, InputScope

Primary Avalonia APIs:

• TextBox, SelectionStart, SelectionEnd, CanUndo, Undo, Redo, TextInputOptions

Concept Mapping

WinUI idiom	Avalonia idiom
TextBox.InputScope	TextInputOptions.ContentType
Return key hints	TextInputOptions.ReturnKeyType
Undo/Redo APIs	Undo/Redo APIs on TextBox
SelectionStart + SelectionLength	SelectionStart + SelectionEnd/SelectAll
TextChanging/TextChanged	TextChanging/TextChanged

Conversion Example

WinUI XAML:

<TextBox x:Name="Editor"
         Text="{x:Bind ViewModel.Query, Mode=TwoWay}"
         InputScope="Search"
         AcceptsReturn="True" />

WinUI C#:

if (Editor.CanUndo)
    Editor.Undo();

Editor.SelectionStart = 0;
Editor.SelectionLength = Editor.Text?.Length ?? 0;

Avalonia XAML:

<TextBox xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         x:Name="Editor"
         Text="{Binding Query}"
         AcceptsReturn="True"
         TextInputOptions.ContentType="Search"
         TextInputOptions.ReturnKeyType="Search" />

Avalonia C#:

if (Editor.CanUndo)
    Editor.Undo();

Editor.SelectAll();

if (Editor.CanRedo)
    Editor.Redo();

Migration Notes

1. Move InputScope intent to TextInputOptions attached properties.
2. Keep undo/redo command wiring bound to CanUndo/CanRedo.
3. Prefer explicit text-input options for mobile/IME parity.

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