ncurseswwin/form/
callbacks.rs

1/*
2    src/form/callbacks.rs
3
4    Copyright (c) 2020-2022 Stephen Whittle  All rights reserved.
5
6    Permission is hereby granted, free of charge, to any person obtaining a copy
7    of this software and associated documentation files (the "Software"),
8    to deal in the Software without restriction, including without limitation
9    the rights to use, copy, modify, merge, publish, distribute, sublicense,
10    and/or sell copies of the Software, and to permit persons to whom
11    the Software is furnished to do so, subject to the following conditions:
12    The above copyright notice and this permission notice shall be included
13    in all copies or substantial portions of the Software.
14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20    IN THE SOFTWARE.
21*/
22
23use std::{collections::HashMap, sync::Mutex};
24use strum::IntoEnumIterator;
25use strum_macros::EnumIter;
26use ncursesw::{SCREEN, form::FORM};
27use crate::form::Form;
28
29static MODULE_PATH: &str = "ncurseswwin::form::callbacks::";
30
31#[derive(PartialEq, Eq, Hash)]
32struct FormKey {
33    form: FORM
34}
35
36impl FormKey {
37    fn new(form: FORM) -> Self {
38        Self { form }
39    }
40}
41
42unsafe impl Send for FormKey { }
43unsafe impl Sync for FormKey { }
44
45#[derive(Copy, Clone, PartialEq, Eq, Hash)]
46struct FormValue {
47    screen: Option<SCREEN>
48}
49
50impl FormValue {
51    fn new(screen: Option<SCREEN>) -> Self {
52        Self { screen }
53    }
54
55    fn screen(&self) -> Option<SCREEN> {
56        self.screen
57    }
58}
59
60unsafe impl Send for FormValue { }
61unsafe impl Sync for FormValue { }
62
63#[derive(Clone, Copy, EnumIter, Debug, PartialEq, Eq, Hash)]
64pub(in crate::form) enum CallbackType {
65    FieldInit,
66    FieldTerm,
67    FormInit,
68    FormTerm
69}
70
71#[derive(PartialEq, Eq, Hash)]
72struct CallbackKey {
73    form:          Option<FORM>,
74    callback_type: CallbackType
75}
76
77impl CallbackKey {
78    fn new(form: Option<FORM>, callback_type: CallbackType) -> Self {
79        Self { form, callback_type }
80    }
81}
82
83unsafe impl Send for CallbackKey { }
84unsafe impl Sync for CallbackKey { }
85
86type Callback = Option<Box<dyn Fn(&Form) + Send>>;
87
88lazy_static! {
89    static ref FORMSCREENS: Mutex<HashMap<FormKey, FormValue>> = Mutex::new(HashMap::new());
90    static ref CALLBACKS: Mutex<HashMap<CallbackKey, Callback>> = Mutex::new(HashMap::new());
91}
92
93macro_rules! extern_form_callback {
94    ($func: ident, $cb_t: ident) => {
95        pub(in crate::form) extern fn $func(form: FORM) {
96            form_callback(form, CallbackType::$cb_t)
97        }
98    }
99}
100
101extern_form_callback!(extern_field_init, FieldInit);
102extern_form_callback!(extern_field_term, FieldTerm);
103extern_form_callback!(extern_form_init, FormInit);
104extern_form_callback!(extern_form_term, FormTerm);
105
106fn form_callback(form: FORM, cb_type: CallbackType) {
107    let get_form = || -> Form {
108        let screen = FORMSCREENS
109            .lock()
110            .unwrap_or_else(|_| panic!("{}form_callback({:p}, {:?}) : FORMSCREENS.lock() failed!!!", MODULE_PATH, form, cb_type))
111            .get(&FormKey::new(form))
112            .unwrap_or_else(|| panic!("{}form_callback({:p}, {:?}) : FORMSCREENS.lock().get() failed!!!", MODULE_PATH, form, cb_type))
113            .screen();
114
115        Form::_from(screen, form, unsafe { (*form).field }, false)
116    };
117
118    let callbacks = CALLBACKS
119        .lock()
120        .unwrap_or_else(|_| panic!("{}form_callback({:p}, {:?}) : CALLBACKS.lock() failed!!!", MODULE_PATH, form, cb_type));
121
122    if let Some(ref callback) = callbacks
123        .get(&CallbackKey::new(Some(form), cb_type))
124        .unwrap_or(&None)
125    {
126        callback(&get_form())
127    } else if let Some(ref callback) = callbacks
128        .get(&CallbackKey::new(None, cb_type))
129        .unwrap_or(&None)
130    {
131        callback(&get_form())
132    } else {
133        panic!("{}form_callback({:p}, {:?}) : callbacks.lock().get() returned None!!!", MODULE_PATH, form, cb_type)
134    }
135}
136
137pub(in crate::form) fn set_form_screen(form: FORM, screen: Option<SCREEN>) {
138    FORMSCREENS
139        .lock()
140        .unwrap_or_else(|_| panic!("{}set_form_screen({:p}) : FORMSCREENS.lock() failed!!!", MODULE_PATH, form))
141        .insert(FormKey::new(form), FormValue::new(screen));
142}
143
144pub(in crate::form) fn set_form_callback<F>(form: Option<FORM>, cb_type: CallbackType, func: F)
145    where F: Fn(&Form) + 'static + Send
146{
147    CALLBACKS
148        .lock()
149        .unwrap_or_else(|_| panic!("{}set_form_callback() : CALLBACKS.lock() failed!!!", MODULE_PATH))
150        .insert(CallbackKey::new(form, cb_type), Some(Box::new(move |form| func(form))));
151}
152
153pub(in crate::form) fn form_tidyup(form: FORM) {
154    let mut form_screens = FORMSCREENS
155        .lock()
156        .unwrap_or_else(|_| panic!("{}form_tidyup({:p}) : FORMSCREENS.lock() failed!!!", MODULE_PATH, form));
157
158    form_screens.remove(&FormKey::new(form));
159    form_screens.shrink_to_fit();
160
161    let mut callbacks = CALLBACKS
162        .lock()
163        .unwrap_or_else(|_| panic!("{}form_tidyup({:p}) : CALLBACKS.lock() failed!!!", MODULE_PATH, form));
164
165    let mut shrink_to_fit = false;
166
167    for cb_type in CallbackType::iter() {
168        if callbacks.remove(&CallbackKey::new(Some(form), cb_type)).is_some() {
169            shrink_to_fit = true;
170        }
171    }
172
173    if shrink_to_fit {
174        callbacks.shrink_to_fit();
175    }
176}
ncurseswwin/form/callbacks.rs

ncurseswwin/form/
callbacks.rs
