1// Copyright © SixtyFPS GmbH <info@slint.dev>
2// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
3
4//! Passe that transform the Timer element into a timer in the Component
5
6use crate::diagnostics::BuildDiagnostics;
7use crate::expression_tree::{BuiltinFunction, Expression, NamedReference};
8use crate::langtype::ElementType;
9use crate::object_tree::*;
10use smol_str::SmolStr;
11use std::rc::Rc;
12
13pub fn lower_timers(component: &Rc<Component>, diag: &mut BuildDiagnostics) {
14 recurse_elem_including_sub_components_no_borrow(
15 component,
16 &None,
17 &mut |elem: &Rc>, parent_element: &Option<ElementRc>| {
18 let is_timer: bool = matches!(&elem.borrow().base_type, ElementType::Builtin(base_type) if base_type.name == "Timer");
19 if is_timer {
20 lower_timer(timer_element:elem, parent_element.as_ref(), diag);
21 }
22 Some(elem.clone())
23 },
24 )
25}
26
27fn lower_timer(
28 timer_element: &ElementRc,
29 parent_element: Option<&ElementRc>,
30 diag: &mut BuildDiagnostics,
31) {
32 let parent_component = timer_element.borrow().enclosing_component.upgrade().unwrap();
33 let Some(parent_element) = parent_element else {
34 diag.push_error("A component cannot inherit from Timer".into(), &*timer_element.borrow());
35 return;
36 };
37
38 if Rc::ptr_eq(&parent_component.root_element, timer_element) {
39 diag.push_error(
40 "Timer cannot be directly repeated or conditional".into(),
41 &*timer_element.borrow(),
42 );
43 return;
44 }
45
46 if !timer_element.borrow().is_binding_set("interval", true) {
47 diag.push_error(
48 "Timer must have a binding set for its 'interval' property".into(),
49 &*timer_element.borrow(),
50 );
51 return;
52 }
53
54 // Remove the timer_element from its parent
55 let mut parent_element_borrowed = parent_element.borrow_mut();
56 let index = parent_element_borrowed
57 .children
58 .iter()
59 .position(|child| Rc::ptr_eq(child, timer_element))
60 .expect("Timer must be a child of its parent");
61 let removed = parent_element_borrowed.children.remove(index);
62 parent_component.optimized_elements.borrow_mut().push(removed);
63 drop(parent_element_borrowed);
64 if let Some((p, idx, _)) = &mut *parent_component.child_insertion_point.borrow_mut() {
65 if Rc::ptr_eq(p, parent_element) && *idx > index {
66 *idx -= 1;
67 }
68 }
69
70 parent_component.timers.borrow_mut().push(Timer {
71 interval: NamedReference::new(timer_element, SmolStr::new_static("interval")),
72 running: NamedReference::new(timer_element, SmolStr::new_static("running")),
73 triggered: NamedReference::new(timer_element, SmolStr::new_static("triggered")),
74 });
75 let update_timers = Expression::FunctionCall {
76 function: BuiltinFunction::UpdateTimers.into(),
77 arguments: vec![],
78 source_location: None,
79 };
80 let change_callbacks = &mut timer_element.borrow_mut().change_callbacks;
81 change_callbacks.entry("running".into()).or_default().borrow_mut().push(update_timers.clone());
82 change_callbacks.entry("interval".into()).or_default().borrow_mut().push(update_timers);
83}
84