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fix: calculator example

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This commit is contained in:
YuKun Liu 2022-01-07 02:08:14 +08:00
parent 4aadec1e30
commit 859be4a2f6
1 changed files with 68 additions and 38 deletions
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106
examples/calculator.rs
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@ -18,12 +18,56 @@ fn main() {
});
}
fn app(cx: Scope) -> Element {
let cur_val = use_state(&cx, || 0.0_f64);
let operator = use_state(&cx, Option::default);
let display_value = use_state(&cx, String::new);
fn clac_val(val: String) -> f64 {
let input_digit = move |num: u8| display_value.modify().push_str(num.to_string().as_str());
let mut result = 0.0_f64;
let mut temp = String::new();
let mut operation = "+".to_string();
for c in val.chars() {
println!("{:?}: {:?} - {:?}", result, c, val);
if c == '+' || c == '-' || c == '*' || c == '/' {
match &operation as &str {
"+" => {result += temp.parse::<f64>().unwrap();},
"-" => {result -= temp.parse::<f64>().unwrap();},
"*" => {result *= temp.parse::<f64>().unwrap();},
"/" => {result /= temp.parse::<f64>().unwrap();},
_ => unreachable!(),
};
operation = c.to_string();
temp = String::new();
} else {
temp.push(c);
}
}
if temp != "" {
match &operation as &str {
"+" => {result += temp.parse::<f64>().unwrap();},
"-" => {result -= temp.parse::<f64>().unwrap();},
"*" => {result *= temp.parse::<f64>().unwrap();},
"/" => {result /= temp.parse::<f64>().unwrap();},
_ => unreachable!(),
};
}
result
}
fn app(cx: Scope) -> Element {
let cur_val = use_state(&cx, || 0.0_f64);
let display_value: UseState<String> = use_state(&cx,String::new);
let input_digit = move |num: u8| {
display_value.modify().push_str(num.to_string().as_str());
};
let input_operator = move |key: &str| {
display_value.modify().push_str(key);
};
cx.render(rsx!(
style { [include_str!("./assets/calculator.css")] }
@ -31,10 +75,10 @@ fn app(cx: Scope) -> Element {
div { class: "app",
div { class: "calculator",
onkeydown: move |evt| match evt.key_code {
KeyCode::Add => operator.set(Some("+")),
KeyCode::Subtract => operator.set(Some("-")),
KeyCode::Divide => operator.set(Some("/")),
KeyCode::Multiply => operator.set(Some("*")),
KeyCode::Add => input_operator("+"),
KeyCode::Subtract => input_operator("-"),
KeyCode::Divide => input_operator("/"),
KeyCode::Multiply => input_operator("*"),
KeyCode::Num0 => input_digit(0),
KeyCode::Num1 => input_digit(1),
KeyCode::Num2 => input_digit(2),
@ -46,7 +90,7 @@ fn app(cx: Scope) -> Element {
KeyCode::Num8 => input_digit(8),
KeyCode::Num9 => input_digit(9),
KeyCode::Backspace => {
if !display_value.as_str().eq("0") {
if !display_value.len() != 0 {
display_value.modify().pop();
}
}
@ -59,30 +103,28 @@ fn app(cx: Scope) -> Element {
button {
class: "calculator-key key-clear",
onclick: move |_| {
display_value.set("0".to_string());
if display_value != "0" {
operator.set(None);
display_value.set(String::new());
if display_value != "" {
cur_val.set(0.0);
}
},
[if display_value == "0" { "C" } else { "AC" }]
[if display_value == "" { "C" } else { "AC" }]
}
button {
class: "calculator-key key-sign",
onclick: move |_| {
if display_value.starts_with("-") {
display_value.set(display_value.trim_start_matches("-").to_string())
} else {
display_value.set(format!("-{}", *display_value))
}
// if display_value.starts_with("-") {
// display_value.set(display_value.trim_start_matches("-").to_string())
// } else {
// display_value.set(format!("-{}", *display_value))
// }
},
"±"
}
button {
class: "calculator-key key-percent",
onclick: move |_| {
let pct = (display_value.parse::<f64>().unwrap() / 100.0).to_string();
display_value.set(pct);
cur_val.set(clac_val(display_value.get().clone()) / 100.0);
},
"%"
}
@ -106,36 +148,24 @@ fn app(cx: Scope) -> Element {
}
div { class: "operator-keys",
button { class: "calculator-key key-divide",
onclick: move |_| operator.set(Some("/")),
onclick: move |_| input_operator("/"),
"÷"
}
button { class: "calculator-key key-multiply",
onclick: move |_| operator.set(Some("*")),
onclick: move |_| input_operator("*"),
"×"
}
button { class: "calculator-key key-subtract",
onclick: move |_| operator.set(Some("-")),
onclick: move |_| input_operator("-"),
"−"
}
button { class: "calculator-key key-add",
onclick: move |_| operator.set(Some("+")),
onclick: move |_| input_operator("+"),
"+"
}
button { class: "calculator-key key-equals",
onclick: move |_| {
if let Some(op) = operator.as_ref() {
let rhs = display_value.parse::<f64>().unwrap();
let new_val = match *op {
"+" => *cur_val + rhs,
"-" => *cur_val - rhs,
"*" => *cur_val * rhs,
"/" => *cur_val / rhs,
_ => unreachable!(),
};
cur_val.set(new_val);
display_value.set(new_val.to_string());
operator.set(None);
}
cur_val.set(clac_val(display_value.get().clone()));
},
"="
}