问题描述
我对铁锈刚起步,对新手也比较陌生。我意识到这是早期,并且非常喜欢bevy,但是坦率地说,我发现示例和文档有所欠缺。
我以/examples/ui/button.rs
为起点。而且我想添加一堆按钮,而不是一个。
我正在寻找一种方法来区分单击了哪个按钮。
我意识到我可以为每个按钮添加一个系统,但这并不是任何语言的正确方法。
因此,我开始添加标记(如bevy-cheatsheet建议的那样)。
commands
.spawn(ButtonComponents { /* cut for brevity */ })
.with_children(|parent| {
parent
.spawn(TextComponents { /* cut for brevity */ })
.with(Marker1);
});
fn button_system(
button_materials: Res<ButtonMaterials>,mut interaction_query: Query<(
&Button,Mutated<Interaction>,&mut Handle<ColorMaterial>,&Children,)>,text_query: Query<&mut Text>,) {
for (_button,interaction,mut material,children) in &mut interaction_query.iter() {
let mut text = text_query.get_mut::<Text>(children[0]).unwrap();
match *interaction {
Interaction::Clicked => {
// This obvIoUsly doesn't work,just to illustrate what I'm looking for.
match text.spawned_with {
Marker1 => doSomething(),Marker2 => dobarrelRoll(),_ => unreachable!()
}
}
Interaction::Hovered => {
text.value = "Hover".to_string();
*material = button_materials.hovered.clone();
}
Interaction::None => {
text.value = "Button".to_string();
*material = button_materials.normal.clone();
}
}
}
}
欢迎任何提示,谢谢!
编辑:现在我很困惑,因为它实际上适用于按钮1(但会使按钮2崩溃):
Interaction::Clicked => {
let marker = text_query.get::<_>(children[0]).unwrap();
match *marker {
Marker1 => println!("marker 1"),_ => unreachable!(),}
}
但这甚至没有建立:
let marker = text_query.get::<_>(children[0]).unwrap();
match *marker {
Marker1 => println!("marker 1"),Marker2 => println!("marker 2"),}
这是错误:
| expected struct `Marker1`,found struct `Marker2`
| `Marker2` is interpreted as a unit struct,not a new binding
| help: introduce a new binding instead: `other_marker2`
解决方法
好的,我找到了答案,但是,如果您有一些更优雅的方法,我很乐于学习并做出正确的答案!
Interaction::Clicked => {
if let Ok(_) = text_query.get::<Marker1>(children[0]) {
println!("marker 1")
}
if let Ok(_) = text_query.get::<Marker2>(children[0]) {
println!("marker 2")
}
if let Ok(_) = text_query.get::<Marker3>(children[0]) {
doBarrelRoll()
}
...
}
在丹尼尔·库尔曼斯发表评论后,我最终得到了这样的东西:
#[derive(PartialEq)] // needed for comparison
pub enum Buttons {
MyFirstButton,MySecondButton,}
struct MyButton {
target: Buttons,}
然后...
commands
.spawn(ButtonComponents { /* cut for brevity */ })
.with_children(|parent| {
parent
.spawn(TextComponents { /* cut for brevity */ })
.with(MyButton { target: Buttons });
});
然后...
Interaction::Clicked => {
if let Ok(btn) = text_query.get_mut::<MyButton>(children[0]) {
match btn.target {
Buttons::MyFirstButton => {
...
},Buttons::MySecondButton => {
...
},_ => unreachable!(),}
}
}