Compare Layout Snapshots

This standalone, read-only program compares two snapshots without treating display names as IDs. It is a useful starting point for a layout history tool. Install the two crates, then run it with cargo run. See desktop management for ID lifetime and coordinate semantics.

use std::collections::HashMap;
use std::io;
use rdi_core::DesktopController;
use rdi_platform_windows::WindowsBackend;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let controller = DesktopController::new(WindowsBackend::new())?;
    let before: HashMap<_, _> = controller.list_icons()?.into_iter()
        .map(|icon| (icon.id, icon.position)).collect();
    println!("Move an icon manually, then press Enter to compare.");
    io::stdin().read_line(&mut String::new())?;
    let after = controller.list_icons()?;
    for icon in &after {
        match before.get(&icon.id) {
            Some(origin) if *origin != icon.position =>
                println!("Moved {}: {origin:?} -> {:?}", icon.display_name, icon.position),
            None => println!("Added: {}", icon.display_name),
            _ => {}
        }
    }
    let missing = before.keys().filter(|identity|
        !after.iter().any(|icon| &icon.id == *identity)).count();
    println!("No longer present: {missing}");
    Ok(())
}

To build restoration, retain the (IconId, Point) pairs, review them against the current monitors, then pass selected pairs to set_positions. That step is a real Shell write and can be affected by Auto arrange. For animated restoration, construct specs from the saved targets and use the lifecycle recipe.