sixtyfps_compilerlib/passes/
visible.rs

1// Copyright © SixtyFPS GmbH <info@sixtyfps.io>
2// SPDX-License-Identifier: (GPL-3.0-only OR LicenseRef-SixtyFPS-commercial)
3
4//! Pass that lowers synthetic `visible` properties to Clip element
5
6use std::cell::RefCell;
7use std::rc::Rc;
8
9use crate::expression_tree::{Expression, NamedReference};
10use crate::langtype::{NativeClass, Type};
11use crate::object_tree::{self, Component, Element, ElementRc};
12use crate::typeregister::TypeRegister;
13
14pub fn handle_visible(component: &Rc<Component>, type_register: &TypeRegister) {
15    let native_clip = type_register.lookup("Clip").as_builtin().native_class.clone();
16
17    crate::object_tree::recurse_elem_including_sub_components(
18        component,
19        &(),
20        &mut |elem: &ElementRc, _| {
21            let is_lowered_from_visible_property =
22                elem.borrow().native_class().map_or(false, |n| {
23                    Rc::ptr_eq(&n, &native_clip) && elem.borrow().id.ends_with("-visibility")
24                });
25            if is_lowered_from_visible_property {
26                // This is the element we just created. Skip it.
27                return;
28            }
29
30            let old_children = {
31                let mut elem = elem.borrow_mut();
32                let new_children = Vec::with_capacity(elem.children.len());
33                std::mem::replace(&mut elem.children, new_children)
34            };
35
36            let has_visible_binding = |e: &ElementRc| {
37                e.borrow().base_type.lookup_property("visible").property_type != Type::Invalid
38                    && (e.borrow().bindings.contains_key("visible")
39                        || e.borrow()
40                            .property_analysis
41                            .borrow()
42                            .get("visible")
43                            .map_or(false, |a| a.is_set))
44            };
45
46            for mut child in old_children {
47                if child.borrow().repeated.is_some() {
48                    let root_elem = child.borrow().base_type.as_component().root_element.clone();
49                    if has_visible_binding(&root_elem) {
50                        object_tree::inject_element_as_repeated_element(
51                            &child,
52                            create_visibility_element(&root_elem, &native_clip),
53                        )
54                    }
55                } else if has_visible_binding(&child) {
56                    let new_child = create_visibility_element(&child, &native_clip);
57                    new_child.borrow_mut().children.push(child);
58                    child = new_child;
59                }
60
61                elem.borrow_mut().children.push(child);
62            }
63        },
64    );
65}
66
67fn create_visibility_element(child: &ElementRc, native_clip: &Rc<NativeClass>) -> ElementRc {
68    let element = Element {
69        id: format!("{}-visibility", child.borrow().id),
70        base_type: Type::Native(native_clip.clone()),
71        enclosing_component: child.borrow().enclosing_component.clone(),
72        bindings: std::iter::once((
73            "clip".to_owned(),
74            RefCell::new(
75                Expression::UnaryOp {
76                    sub: Box::new(Expression::PropertyReference(NamedReference::new(
77                        child, "visible",
78                    ))),
79                    op: '!',
80                }
81                .into(),
82            ),
83        ))
84        .collect(),
85        ..Default::default()
86    };
87    Rc::new(RefCell::new(element))
88}
sixtyfps_compilerlib/passes/visible.rs

sixtyfps_compilerlib/passes/
visible.rs
