gui_server_api/
touch.rs

1// SPDX-FileCopyrightText: 2024 Foundation Devices, Inc. <hello@foundation.xyz>
2// SPDX-License-Identifier: GPL-3.0-or-later
3
4use num_derive::{FromPrimitive, ToPrimitive};
5use num_traits::{FromPrimitive, ToPrimitive};
6
7#[derive(Debug, Copy, Clone, PartialEq, Eq, ToPrimitive, FromPrimitive)]
8pub enum TouchKind {
9    Press = 0,
10    Release,
11    Drag,
12}
13
14#[derive(Debug, Copy, Clone)]
15pub struct Touch {
16    pub kind: TouchKind,
17    pub id: usize,
18    pub x: usize,
19    pub y: usize,
20}
21
22impl Touch {
23    #[must_use]
24    pub fn translate_pos(&self, origin_x: usize, origin_y: usize) -> Touch {
25        Touch { x: self.x.saturating_sub(origin_x), y: self.y.saturating_sub(origin_y), ..*self }
26    }
27
28    #[must_use]
29    pub fn with_offset(&self, offset_x: i32, offset_y: i32) -> Touch {
30        Touch {
31            x: (self.x as i32).saturating_add(offset_x) as usize,
32            y: (self.y as i32).saturating_add(offset_y) as usize,
33            ..*self
34        }
35    }
36
37    pub fn is_within_area(&self, x: usize, y: usize, w: usize, h: usize) -> bool {
38        (self.x >= x && self.x < x + w) && (self.y >= y && self.y < y + h)
39    }
40
41    pub fn is_press(&self) -> bool { matches!(self.kind, TouchKind::Press) }
42
43    pub fn is_drag(&self) -> bool { matches!(self.kind, TouchKind::Drag) }
44
45    pub fn is_release(&self) -> bool { matches!(self.kind, TouchKind::Release) }
46
47    /// Used by `gui-server` to convert `Touch` message into `InputMessage` format for the
48    /// use in GUI apps.
49    pub fn as_input_message(&self, msg_id: usize) -> xous::Message {
50        xous::Message::new_scalar(msg_id, self.kind.to_usize().expect("to u32"), self.id, self.x, self.y)
51    }
52
53    /// To be used by GUI apps to parse an `InputMessage` from the `gui-server`'s
54    /// `receive_input()`.
55    pub fn try_from_input_message(msg: &xous::Message) -> Option<Self> {
56        let scalar = msg.scalar_message()?;
57        let kind = TouchKind::from_usize(scalar.arg1)?;
58        let id = scalar.arg2;
59        let x = scalar.arg3;
60        let y = scalar.arg4;
61        Some(Touch { kind, id, x, y })
62    }
63
64    pub fn diff(&self, other: &Touch) -> (isize, isize) {
65        (self.x as isize - other.x as isize, self.y as isize - other.y as isize)
66    }
67
68    /// Calculate the distance between two touches.
69    pub fn distance_to(&self, other: &Touch) -> f32 {
70        let (dx, dy) = self.diff(other);
71        (dx as f32 * dx as f32 + dy as f32 * dy as f32).sqrt()
72    }
73}
gui_server_api/touch.rs

gui_server_api/
touch.rs
