1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
use crate::{list_item, UiExt as _};
/// A collapsible section header, with support for optional help tooltip and button.
///
/// It toggles on click.
#[allow(clippy::type_complexity)]
pub struct SectionCollapsingHeader<'a> {
label: egui::WidgetText,
default_open: bool,
button: Option<Box<dyn list_item::ItemButton + 'a>>,
help: Option<Box<dyn FnOnce(&mut egui::Ui) + 'a>>,
}
impl<'a> SectionCollapsingHeader<'a> {
/// Create a new [`Self`].
///
/// See also [`crate::UiExt::section_collapsing_header`]
pub fn new(label: impl Into<egui::WidgetText>) -> Self {
Self {
label: label.into(),
default_open: true,
button: None,
help: None,
}
}
/// Set the default open state of the section header.
///
/// Defaults to `true`.
#[inline]
pub fn default_open(mut self, default_open: bool) -> Self {
self.default_open = default_open;
self
}
/// Set the button to be shown in the header.
#[inline]
pub fn button(mut self, button: impl list_item::ItemButton + 'a) -> Self {
self.button = Some(Box::new(button));
self
}
/// Set the help text tooltip to be shown in the header.
//TODO(#6191): the help button should be just another `impl ItemButton`.
#[inline]
pub fn help_text(mut self, help: impl Into<egui::WidgetText>) -> Self {
let help = help.into();
self.help = Some(Box::new(move |ui| {
ui.label(help);
}));
self
}
/// Set the help markdown tooltip to be shown in the header.
//TODO(#6191): the help button should be just another `impl ItemButton`.
#[inline]
pub fn help_markdown(mut self, help: &'a str) -> Self {
self.help = Some(Box::new(move |ui| {
ui.markdown_ui(help);
}));
self
}
/// Set the help UI closure to be shown in the header.
//TODO(#6191): the help button should be just another `impl ItemButton`.
#[inline]
pub fn help_ui(mut self, help: impl FnOnce(&mut egui::Ui) + 'a) -> Self {
self.help = Some(Box::new(help));
self
}
/// Display the header.
pub fn show(
self,
ui: &mut egui::Ui,
add_body: impl FnOnce(&mut egui::Ui),
) -> egui::CollapsingResponse<()> {
let Self {
label,
default_open,
button,
help,
} = self;
let id = ui.make_persistent_id(label.text());
let mut content = list_item::LabelContent::new(label);
if button.is_some() || help.is_some() {
content = content
.with_buttons(|ui| {
let button_response = button.map(|button| button.ui(ui));
let help_response = help.map(|help| ui.help_hover_button().on_hover_ui(help));
match (button_response, help_response) {
(Some(button_response), Some(help_response)) => {
button_response | help_response
}
(Some(response), None) | (None, Some(response)) => response,
(None, None) => unreachable!("at least one of button or help is set"),
}
})
.always_show_buttons(true);
}
let resp = list_item::ListItem::new()
.interactive(true)
.force_background(crate::design_tokens().section_collapsing_header_color())
.show_hierarchical_with_children_unindented(ui, id, default_open, content, |ui| {
//TODO(ab): this space is not desirable when the content actually is list items
ui.add_space(4.0); // Add space only if there is a body to make minimized headers stick together.
add_body(ui);
ui.add_space(4.0); // Same here
});
if resp.item_response.clicked() {
// `show_hierarchical_with_children_unindented` already toggles on double-click,
// but we are _only_ a collapsing header, so we should also toggle on normal click:
if let Some(mut state) = egui::collapsing_header::CollapsingState::load(ui.ctx(), id) {
state.toggle(ui);
state.store(ui.ctx());
}
}
egui::CollapsingResponse {
header_response: resp.item_response,
body_response: resp.body_response.map(|r| r.response),
body_returned: None,
openness: resp.openness,
}
}
}