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// Catch potential problems with clippy and the macro
#![warn(
missing_debug_implementations,
rust_2018_idioms,
unreachable_pub,
unused_qualifications,
clippy::cargo,
clippy::must_use_candidate,
clippy::used_underscore_binding
)]
use gtk::prelude::{
BoxExt, ButtonExt, GridExt, GtkWindowExt, ObjectExt, OrientableExt, ToggleButtonExt, WidgetExt,
};
use relm4::{ComponentParts, ComponentSender, RelmApp, RelmWidgetExt, SimpleComponent};
#[tracker::track]
struct App {
value: u8,
}
#[derive(Debug)]
enum Msg {
Increment,
Decrement,
}
struct AppInit {
counter: u8,
}
#[relm4::component(pub)]
impl SimpleComponent for App {
type Init = AppInit;
type Input = Msg;
type Output = ();
// AppWidgets is generated by the macro,
// Can be omitted in most cases.
type Widgets = AppWidgets;
view! {
#[root]
#[name(main_window)]
gtk::Window {
set_title: Some("Macro reference example"),
set_default_size: (300, 100),
gtk::Box {
set_orientation: gtk::Orientation::Vertical,
set_spacing: 5,
set_margin_all: 5,
append: inc_button = >k::Button {
set_label: "Increment",
// Only set this if `icon_name` is Some
set_icon_name?: icon_name,
connect_clicked[sender] => move |_| {
sender.input(Msg::Increment);
}
},
gtk::Button {
set_label: "Decrement",
connect_clicked => Msg::Decrement,
},
gtk::Grid {
attach[1, 1, 1, 1] = >k::Label {
set_label: "Count to 10 to see if the tracker works!",
// Alternative: #[track = "counter.value % 10 == 0"]
#[track(skip_init, counter.value.is_multiple_of(10))]
set_label: &format!("Grid works! ({})", counter.value),
}
},
// A conditional widget
// Alternative: #[transition = "SlideLeft"]
#[transition(SlideLeft)]
append = if counter.value.is_multiple_of(2) {
gtk::Label {
set_label: "Value is even",
}
} else if counter.value.is_multiple_of(3) {
gtk::Label {
set_label: "Value is dividable by 3",
}
} else {
gtk::Label {
set_label: "Value is odd",
}
},
#[transition = "SlideRight"]
append: match_stack = match counter.value {
(0..=2) => {
gtk::Label {
set_label: "Value is smaller than 3",
}
},
_ => {
gtk::Label {
set_label: "Value is higher than 2",
}
},
},
append = >k::Label,
gtk::Label::builder()
.label("Builder pattern works!")
.selectable(true)
.build(),
gtk::Label::new(Some("Constructors work!")),
/// Counter label
#[name = "counter_label"]
gtk::Label {
// Mirror property "label" for widget "bind_label"
#[chain(build())]
bind_property: ("label", &bind_label, "label"),
set_label: "Click the counter so see the value!",
#[watch(skip_init)]
set_label: &format!("Counter: {}", counter.value),
#[track]
set_margin_all: counter.value.into(),
},
#[name = "bind_label"]
gtk::Label {},
// You can also use returned widgets
gtk::Stack {
add_child = >k::Label {
set_label: "placeholder",
} -> {
// Set the title of the stack page
set_title: "page title",
}
},
gtk::ToggleButton {
set_label: "Counter is even",
#[watch]
#[block_signal(toggle_handler)]
set_active: counter.value.is_multiple_of(2),
connect_toggled[sender] => move |_| {
sender.input(Msg::Increment);
} @toggle_handler,
},
#[local]
local_label -> gtk::Label {
set_opacity: 0.7,
},
#[local_ref]
local_ref_label -> gtk::Label {
set_opacity: 0.7,
set_size_request: (40, 40),
},
}
},
gtk::Window {
set_title: Some("Another window"),
set_default_size: (300, 100),
set_transient_for: Some(&main_window),
set_visible: false,
// Empty args
grab_focus: (),
#[watch]
set_visible: counter.value == 42,
#[name = "my_label_name"]
gtk::Label {
set_label: "You made it to 42!",
}
}
}
// Initialize the component.
fn init(
init: Self::Init,
renamed_root: Self::Root,
sender: ComponentSender<Self>,
) -> ComponentParts<Self> {
let counter = App {
value: init.counter,
tracker: 0,
};
// Set icon name randomly to Some("go-up-symbolic") or None
let icon_name = rand::random::<bool>().then_some("go-up-symbolic");
let local_label = gtk::Label::new(Some("local_label"));
let local_ref_label_value = gtk::Label::new(Some("local_ref_label"));
let local_ref_label = &local_ref_label_value;
// Insert the macro code generation here
let widgets = view_output!();
ComponentParts {
model: counter,
widgets,
}
}
fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) {
self.reset();
match msg {
Msg::Increment => {
self.set_value(self.value.wrapping_add(1));
}
Msg::Decrement => {
self.set_value(self.value.wrapping_sub(1));
}
}
}
}
fn main() {
let app = RelmApp::new("relm4.example.macro_reference");
app.run::<App>(AppInit { counter: 0 });
}