carnelian/input/
key3.rs

1// Copyright 2022 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use crate::input::{input3_key_to_hid_usage, keyboard, DeviceId, Event, EventType, Modifiers};
6use std::collections::HashSet;
7
8#[derive(Default)]
9pub(crate) struct KeyboardInputHandler {
10    keyboard_device_id: DeviceId,
11    pressed_keys: HashSet<fidl_fuchsia_input::Key>,
12}
13
14impl KeyboardInputHandler {
15    pub fn new() -> Self {
16        Self {
17            keyboard_device_id: DeviceId("scenic-keyboard".to_string()),
18            pressed_keys: HashSet::new(),
19        }
20    }
21
22    pub fn handle_key_event(&mut self, event: &fidl_fuchsia_ui_input3::KeyEvent) -> Vec<Event> {
23        if event.type_.is_none() || event.timestamp.is_none() || event.key.is_none() {
24            println!("Malformed key event {:?}", event);
25            return vec![];
26        }
27        let event_type = event.type_.unwrap();
28        let timestamp = event.timestamp.unwrap() as u64;
29        let key = event.key.unwrap();
30        let phase: Option<keyboard::Phase> = match event_type {
31            fidl_fuchsia_ui_input3::KeyEventType::Pressed => Some(keyboard::Phase::Pressed),
32            fidl_fuchsia_ui_input3::KeyEventType::Released => Some(keyboard::Phase::Released),
33            fidl_fuchsia_ui_input3::KeyEventType::Cancel => Some(keyboard::Phase::Cancelled),
34            // The input3 sync feature is not supported
35            fidl_fuchsia_ui_input3::KeyEventType::Sync => None,
36        };
37        if phase.is_none() {
38            return vec![];
39        }
40        let phase = phase.unwrap();
41
42        match phase {
43            keyboard::Phase::Pressed => {
44                self.pressed_keys.insert(key);
45            }
46            keyboard::Phase::Released | keyboard::Phase::Cancelled => {
47                self.pressed_keys.remove(&key);
48            }
49            _ => (),
50        }
51
52        let device_id = self.keyboard_device_id.clone();
53        let hid_usage = input3_key_to_hid_usage(key);
54        let modifiers = Modifiers::from_pressed_keys_3(&self.pressed_keys);
55
56        // Apply the resolved code point if one is available.  Fall back to US_QWERTY if no such
57        // luck. Note that the fallback currently includes the nonprintable keys, which may need to
58        // change in the future. Filter out code point if 0.
59        let code_point = match event.key_meaning {
60            Some(fidl_fuchsia_ui_input3::KeyMeaning::Codepoint(cp)) => Some(cp),
61            Some(fidl_fuchsia_ui_input3::KeyMeaning::NonPrintableKey(_)) | _ => keymaps::US_QWERTY
62                .hid_usage_to_code_point_for_mods(hid_usage, modifiers.shift, modifiers.caps_lock),
63        }
64        .filter(|cp| *cp != 0);
65
66        let keyboard_event = keyboard::Event { code_point, hid_usage, modifiers, phase };
67
68        let event = Event {
69            event_time: timestamp,
70            event_type: EventType::Keyboard(keyboard_event),
71            device_id,
72        };
73
74        vec![event]
75    }
76}
carnelian/input/key3.rs

carnelian/input/
key3.rs
