我正在使用Relm在Rust中使用SpinButton进行挣扎。 (免责声明,我是Rust 和 GTK的菜鸟)
#![feature(proc_macro)]
extern crate gtk;
use chrono::{NaiveTime, Duration};
use gtk::prelude::*;
use gtk::{
WidgetExt,
ContainerExt,
EntryExt,
Adjustment
};
use relm::Widget;
use relm_attributes::widget;
#[derive(Msg, Debug)]
pub enum Msg {
Changed,
Display,
}
#[widget]
impl Widget for DurationSpin {
fn model(m: Duration) -> Duration {
m
}
fn update(&mut self, event: Msg) {
match event {
Msg::Display => self.format_display(),
Msg::Changed => {
println!("update, self.spin_btn.get_value_as_int() = {:?}", self.spin_btn.get_value_as_int());
self.model = Duration::minutes(self.spin_btn.get_value_as_int() as i64)
},
};
}
fn format_display(&mut self) {
println!("format_display, self.spin_btn.get_value_as_int() = {:?}", self.spin_btn.get_value_as_int());
let minus = self.model.num_hours() * 60;
self.spin_btn.set_text(&format!("{:02}:{:02}",
self.model.num_hours(), self.model.num_minutes() - minus));
}
view! {
#[name="spin_btn"]
gtk::SpinButton {
max_width_chars: 5,
width_chars: 5,
max_length: 5,
numeric: false,
output => (Msg::Display, Inhibit(false)),
value_changed => Msg::Changed,
adjustment: &Adjustment::new(self.model.num_minutes() as f64, 0.0, 720.0, 1.0, 60.0, 0.0),
}
}
}
(整个项目:https://github.com/Geobert/rusty_flexi)
我的问题是点击" +"让get_value_as_int
始终返回' 1'。
似乎我的output
信号导致了这种情况,因为停用连接可以解决错误,但我无法看清它的错误。
答案 0 :(得分:0)
似乎output
信号处理程序不能异步。这意味着在这种情况下,您不应使用relm消息传递。
您应该执行以下操作:
fn init_view(&mut self) {
let hours = self.model.num_hours();
let minutes = self.model.num_minutes();
self.spin_btn.connect_output(move |spin_btn| {
let minus = hours * 60;
spin_btn.set_text(&format!("{:02}:{:02}",
hours, minutes - minus));
Inhibit(false)
});
}
并删除output => (Msg::Display, Inhibit(false)),