Module undo_support 

Undo support for widgets. Undo support for widgets.

This module provides the UndoSupport trait that widgets can implement to enable undo/redo functionality for their state changes.

Design

The undo system is based on the Command Pattern. Each undoable operation creates a command that knows how to:

1. Execute the operation (already done when the command is created)
2. Undo the operation (reverse the change)
3. Redo the operation (reapply the change)

Commands are stored in a history stack managed by HistoryManager.

Usage

Widgets that implement UndoSupport can generate commands for their state changes. These commands can then be pushed to a history manager for undo/redo support.

use ftui_widgets::undo_support::{UndoSupport, TextEditOperation};
use ftui_runtime::undo::HistoryManager;

let mut history = HistoryManager::default();
let mut input = TextInput::new();

// Perform an edit and create an undo command
if let Some(cmd) = input.create_undo_command(TextEditOperation::Insert {
    position: 0,
    text: "Hello".to_string(),
}) {
    history.push(cmd);
}

Structs

UndoWidgetId

Unique identifier for a widget instance.

WidgetTextEditCmd

A widget undo command for text editing.

Enums

ListOperation

List selection operation types.

SelectionOperation

Selection state operation types.

TableOperation

Table operation types.

TextEditOperation

Text edit operation types.

TreeOperation

Tree expansion operation types.

Traits

ListUndoExt

Extension trait for list widgets with undo support.

TableUndoExt

Extension trait for table widgets with undo support.

TextInputUndoExt

Extension trait for text input widgets with undo support.

TreeUndoExt

Extension trait for tree widgets with undo support.

UndoSupport

Trait for widgets that support undo operations.

Type Aliases

TextEditApplyFn

Callback for applying a text edit operation.

TextEditUndoFn

Callback for undoing a text edit operation.