rust_widgets 1.1.3

Pure Rust cross-platform native GUI library with hardware-adaptive rendering, 60+ widgets, touch/gesture support, i18n, and SVG-pipeline-accurate output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

// SPDX-FileCopyrightText: Copyright (c) 2026 Mike Li/Mikewolfli/Wei Li(mikewolfli@163.com)
// SPDX-License-Identifier: MIT

use super::{CommandDescription, CommandId, UndoCommand};
use std::cell::RefCell;
use std::rc::Rc;
use std::sync::atomic::{AtomicU64, Ordering};

static NEXT_TEXT_COMMAND_ID: AtomicU64 = AtomicU64::new(1);

/// Snapshot command shared by text-editing widgets.
pub(crate) struct TextSnapshotCommand {
    id: CommandId,
    target: Rc<RefCell<String>>,
    before: String,
    after: String,
    command_type: &'static str,
}

impl TextSnapshotCommand {
    /// Creates a command for a mutation that has already been applied.
    pub(crate) fn new(
        target: Rc<RefCell<String>>,
        before: String,
        after: String,
        command_type: &'static str,
    ) -> Self {
        Self {
            id: CommandId(NEXT_TEXT_COMMAND_ID.fetch_add(1, Ordering::Relaxed)),
            target,
            before,
            after,
            command_type,
        }
    }
}

impl UndoCommand for TextSnapshotCommand {
    fn id(&self) -> CommandId {
        self.id
    }

    fn description(&self) -> CommandDescription {
        CommandDescription {
            text: "Edit text".to_string(),
            timestamp_ms: 0,
            command_type: self.command_type,
        }
    }

    fn execute(&mut self) -> Result<(), String> {
        *self.target.borrow_mut() = self.after.clone();
        Ok(())
    }

    fn undo(&mut self) -> Result<(), String> {
        *self.target.borrow_mut() = self.before.clone();
        Ok(())
    }
}