WpfCodeEditor 0.9.6.7

WpfCodeEditor

A full-featured WPF code editor UserControl for .NET 8.
Drop it into any WPF window — no IDE, no plugin host, no external dependencies.

dotnet add package WpfCodeEditor

Quick Start

1 — Add the namespace

<Window
    xmlns:ce="clr-namespace:WpfHexEditor.Editor.CodeEditor.Controls;assembly=WpfHexEditor.Editor.CodeEditor">

2 — Place the control

<ce:CodeEditorSplitHost x:Name="Editor" />

3 — Load a file

using WpfHexEditor.Editor.CodeEditor.Controls;

// Load text
Editor.PrimaryEditor.LoadText(File.ReadAllText("Program.cs"));

// Optional: apply syntax highlighting
var lang = Editor.PrimaryEditor.GetLanguageForExtension(".cs");
Editor.SetLanguage(lang);

4 — Read back

string content = Editor.PrimaryEditor.Text;
bool isDirty  = Editor.IsDirty;
await Editor.SaveAsync(); // saves to the file that was opened

Lightweight plain-text variant

xmlns:te="clr-namespace:WpfHexEditor.Editor.TextEditor;assembly=WpfHexEditor.Editor.TextEditor"
...
<te:TextEditor x:Name="TextEdit" />

TextEdit.LoadText(File.ReadAllText("notes.txt"));
string content = TextEdit.Text;

Use TextEditor when you only need plain text.
Use CodeEditorSplitHost for syntax highlighting, folding, search, and LSP.

Features

Editing

• Multi-caret editing (Ctrl+Click)
• Smart auto-complete — context-aware, expression-filtered
• Code snippets with Tab expansion
• Block selection (Alt+Drag)
• Drag-and-drop text blocks
• Auto-indent and smart brace matching
• Unified undo/redo engine (coalescence)

Syntax & Languages

• 400+ language definitions (.whfmt format, embedded in the package)
• Syntax highlighting with customizable themes
• LSP semantic token coloring
• Code folding — braces, regions, tags
• End-of-block hover hints

Navigation

• Line numbers with configurable gutter
• Minimap overview panel
• Go to line (Ctrl+G) / Go to position dialog
• Breadcrumb navigation bar
• Bookmarks
• Ctrl+F inline search panel

Search & Replace

• Find / replace with regex support
• Match case / whole word
• Search result highlighting with scroll-bar tick marks

Advanced

• LSP (Language Server Protocol) integration
• Split view (horizontal or vertical)
• Diagnostic markers (errors, warnings, info)
• Scroll marker panel
• Column guides
• Word wrap
• Read-only mode (selection and copy still work)
• Word occurrence highlighting

Settings

• Built-in settings panel with auto-generated UI
• JSON settings persistence (export / import)
• Full DependencyProperty API for programmatic control

Standalone setup (no IDE host)

WpfCodeEditor runs without any plugin host or shell.
The only requirement is merging the resource dictionary so themes resolve correctly:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/WpfHexEditor.Editor.CodeEditor;component/Themes/Generic.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

Context menus and pop-ups use opaque backgrounds by default; no extra theming is needed.

Included Assemblies

All bundled inside the package — zero external NuGet dependencies:

What's New in 0.9.6.7

• New: Ctrl+F inline search panel — find next/previous without a separate dialog.
• New: Drag-and-drop text blocks — select a region and drag to reposition.
• New: CodeEditor refresh command — force-reload the current document from disk.
• New: Undo/Redo unification — HexEditor and CodeEditor share a single UndoEngine.
• New: LSP semantic token highlighting — richer coloring driven by the language server.
• New: Go-to-position dialog — jump to an absolute byte/line offset.
• New: Empty editor tabs — open a placeholder tab before loading a file.
• Fix: Scroll-bar theming consistent across split-view panes.
• Fix: TextEditor viewport line-count sync after window resize.
• Fix: SmartComplete expression-aware filtering — token type at caret drives suggestion list.
• Fix: Plugin error routing — plugin errors forwarded to output rather than silently dropped.
• Fix: LSP host startup stability improvements.

What's New in 0.9.6.6

• Fix: SmartComplete popup no longer steals keyboard focus. The suggestion list is non-focusable — caret blink and word-highlight timers are never interrupted. Up/Down/PageUp/PageDown/Home/End/Enter/Tab/Escape are forwarded from the editor to the popup.
• Fix: CodeEditorSplitHost — IDE docking focus (Focus() on the Grid container) is correctly routed to the active editor via OnGotKeyboardFocus. Secondary editor ModifiedChanged is now wired. IsDirty, Save, and SaveAsync always delegate to the primary editor (which owns the file path).
• Fix: Word-highlight feedback loop eliminated — cursor position is tracked before InvalidateRegion, preventing a second 250ms debounce cycle from firing on every arrow-key press.
• Fix: Arrow-key navigation now triggers NotifyCursorMoved() so word-highlight updates without waiting for the next render frame.
• Fix: Save guard — writing an empty buffer over a non-empty file on disk is blocked with a status message (prevents data loss from timing races during OpenAsync).
• Fix: LSP burst-init dispatcher calls downgraded to DispatcherPriority.Background so Roslyn workspace startup does not block WPF frame rendering.
• New: EnableWordHighlight setting — toggle occurrence highlighting via the Code Editor options page or CodeEditorDefaultSettings.EnableWordHighlight.

What's New in 0.9.6.5

• Fix: LSP inlay hints and declaration hints (code lens) no longer render as ghost overlays on top of code text. Hints now correctly align with the text area origin, accounting for gutter offset, top margin, and horizontal scroll.
• Fix: ReadOnly mode no longer blocks text selection and caret placement. Only text modification is blocked — selection (Shift+Arrow, drag), caret click, copy (Ctrl+C), and select all (Ctrl+A) now work as expected.

License

GNU Affero General Public License v3.0 (AGPL-3.0)

Links

• GitHub Repository
• Report Issues