Add trait object example
This commit is contained in:
Timothy Warren
parent
ec147dce21
commit
bac5c02bd8
2
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generated
2
.idea/misc.xml
generated
@ -32,6 +32,8 @@
|
||||
<cargoProject FILE="$PROJECT_DIR$/mutex/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/twelve_days_of_christmas/Cargo.toml" />
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9
.idea/rust.iml
generated
9
.idea/rust.iml
generated
@ -130,6 +130,13 @@
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<sourceFolder url="file://$MODULE_DIR$/twelve_days_of_christmas/examples" isTestSource="false" />
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@ -142,6 +149,7 @@
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@ -159,6 +167,7 @@
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170
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170
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@ -13,21 +13,7 @@
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@ -41,11 +27,13 @@
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<find>ftoc</find>
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<find>expensive_closure(intensity)</find>
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<find>ordinals</find>
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<replace>f_to_c</replace>
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<replace>expensive_result.value(intensity)</replace>
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@ -54,11 +42,6 @@
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@ -105,6 +88,11 @@
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@ -135,6 +123,17 @@
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@ -166,7 +165,7 @@
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@ -194,7 +193,7 @@
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@ -213,6 +212,16 @@
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<option name="channel" value="DEFAULT" />
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@ -223,26 +232,6 @@
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@ -263,6 +252,16 @@
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<option name="TEST_OBJECT" value="class" />
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@ -272,18 +271,15 @@
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<item itemvalue="Cargo Command.Run twelve_days_of_christmas" />
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@ -311,13 +307,15 @@
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@ -333,7 +331,7 @@
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@ -347,31 +345,6 @@
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@ -760,13 +733,6 @@
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@ -776,11 +742,45 @@
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|
||||
|
||||
7
gui/Cargo.toml
Normal file
7
gui/Cargo.toml
Normal file
@ -0,0 +1,7 @@
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[package]
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name = "gui"
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||||
version = "0.1.0"
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||||
authors = ["Timothy Warren <twarren@nabancard.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[dependencies]
|
||||
48
gui/src/lib.rs
Normal file
48
gui/src/lib.rs
Normal file
@ -0,0 +1,48 @@
|
||||
//! An implementation of a "trait object",
|
||||
//! which allows dynamic dispatch for implementing types,
|
||||
//! even allowing disparate types to be called, unlike a
|
||||
//! generic, which requires one specific implementation.
|
||||
//!
|
||||
//! Trait objects have some limitations (They must be "object-safe"):
|
||||
//! * Methods can not return `Self`
|
||||
//! * Methods can not have generic type parameters
|
||||
|
||||
/// The base trait definition
|
||||
pub trait Draw {
|
||||
fn draw(&self);
|
||||
}
|
||||
|
||||
/// A struct able to utilize the "trait object", via the Box<dyn Draw> type
|
||||
pub struct Screen {
|
||||
pub components: Vec<Box<dyn Draw>>,
|
||||
}
|
||||
|
||||
/// A method able to call the draw method on any objects
|
||||
/// implementing the Draw "trait object"
|
||||
impl Screen {
|
||||
pub fn run(&self) {
|
||||
for component in self.components.iter() {
|
||||
component.draw();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub struct Button {
|
||||
pub width: u32,
|
||||
pub height: u32,
|
||||
pub label: String,
|
||||
}
|
||||
|
||||
impl Draw for Button {
|
||||
fn draw(&self) {
|
||||
// code to actually draw a button
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
#[test]
|
||||
fn it_works() {
|
||||
assert_eq!(2 + 2, 4);
|
||||
}
|
||||
}
|
||||
36
gui/src/main.rs
Normal file
36
gui/src/main.rs
Normal file
@ -0,0 +1,36 @@
|
||||
use gui::{Button, Draw, Screen};
|
||||
|
||||
struct SelectBox {
|
||||
width: u32,
|
||||
height: u32,
|
||||
options: Vec<String>,
|
||||
}
|
||||
|
||||
impl Draw for SelectBox {
|
||||
fn draw(&self) {
|
||||
// code to actually draw a select box
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let screen = Screen {
|
||||
components: vec![
|
||||
Box::new(SelectBox {
|
||||
width: 75,
|
||||
height: 10,
|
||||
options: vec![
|
||||
String::from("Yes"),
|
||||
String::from("Maybe"),
|
||||
String::from("No")
|
||||
],
|
||||
}),
|
||||
Box::new(Button {
|
||||
width: 50,
|
||||
height: 10,
|
||||
label: String::from("OK"),
|
||||
}),
|
||||
],
|
||||
};
|
||||
|
||||
screen.run();
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user