mirror of
https://github.com/DioxusLabs/dioxus
synced 2024-11-23 20:53:06 +00:00
9e4ec43b1e
I also removed all trailing whitespace from lines since I have Emacs configured to highlight this.
107 lines
3.6 KiB
Markdown
107 lines
3.6 KiB
Markdown
# Html (and SVG) Namespace for Dioxus
|
|
|
|
The Dioxus `rsx!` and `html!` macros can accept any compile-time correct namespace on top of NodeFactory. This crate provides the HTML (and SVG) namespaces which get imported in the Dioxus prelude.
|
|
|
|
However, this abstraction enables you to add any namespace of elements, provided they're in scope when rsx! is called. For an example, a UI that is designed for Augmented Reality might use different primitives than HTML:
|
|
|
|
```rust
|
|
use ar_namespace::*;
|
|
|
|
rsx! {
|
|
magic_div {
|
|
magic_header {}
|
|
magic_paragraph {
|
|
on_magic_click: move |event| {
|
|
//
|
|
}
|
|
}
|
|
}
|
|
}
|
|
```
|
|
|
|
This is currently a not-very-explored part of Dioxus. However, the namespacing system does make it possible to provide syntax highlighting, documentation, "go to definition" and compile-time correctness, so it's worth having it abstracted.
|
|
|
|
## How it works:
|
|
|
|
Elements for dioxus must implement the (simple) DioxusElement trait to be used in the rsx! macro.
|
|
|
|
```rust
|
|
struct div;
|
|
impl DioxusElement for div {
|
|
const TAG_NAME: &'static str = "div";
|
|
const NAME_SPACE: Option<&'static str> = None;
|
|
}
|
|
```
|
|
|
|
All elements should be defined as a zero-sized-struct (also known as unit struct). These structs are zero-cost and just provide the type-level trickery to Rust for compile-time correct templates.
|
|
|
|
Attributes would then be implemented as methods on these unit structs.
|
|
|
|
The HTML namespace is defined mostly with macros. However, the expanded form would look something like this:
|
|
```rust
|
|
struct base;
|
|
impl DioxusElement for base {
|
|
const TAG_NAME: &'static str = "base";
|
|
const NAME_SPACE: Option<&'static str> = None;
|
|
}
|
|
impl base {
|
|
#[inline]
|
|
fn href<'a>(&self, f: NodeFactory<'a>, v: Arguments) -> Attribute<'a> {
|
|
f.attr("href", v, None, false)
|
|
}
|
|
#[inline]
|
|
fn target<'a>(&self, f: NodeFactory<'a>, v: Arguments) -> Attribute<'a> {
|
|
f.attr("target", v, None, false)
|
|
}
|
|
}
|
|
```
|
|
Because attributes are defined as methods on the unit struct, they guard the attribute creation behind a compile-time correct interface.
|
|
|
|
|
|
## How to extend it:
|
|
|
|
Whenever the rsx! macro is called, it relies on a module `dioxus_elements` to be in scope. When you enable the `html` feature in dioxus, this module gets imported in the prelude. However, you can extend this with your own set of custom elements by making your own `dioxus_elements` module and re-exporting the html namespace.
|
|
|
|
```rust
|
|
mod dioxus_elements {
|
|
use dioxus::prelude::dioxus_elements::*;
|
|
struct my_element;
|
|
impl DioxusElement for my_element {
|
|
const TAG_NAME: &'static str = "base";
|
|
const NAME_SPACE: Option<&'static str> = None;
|
|
}
|
|
}
|
|
```
|
|
|
|
## Limitations:
|
|
-
|
|
|
|
## How to work around it:
|
|
If an attribute in Dioxus is invalid (defined incorrectly) - first, make an issue - but then, you can work around it. The raw builder API is actually somewhat ergonomic to work with, and the NodeFactory type exposes a bunch of methods to make any type of tree - even invalid ones! So obviously, be careful, but there's basically anything you can do.
|
|
|
|
```rust
|
|
cx.render(rsx!{
|
|
div {
|
|
h1 {}
|
|
// Oh no! I need a super custom element
|
|
{LazyNodes::new(move |f| {
|
|
f.raw_element(
|
|
// tag name
|
|
"custom_element",
|
|
|
|
// attributes
|
|
&[f.attr("billy", format_args!("goat"))],
|
|
|
|
// listeners
|
|
&[f.listener(onclick(move |_| {}))],
|
|
|
|
// children
|
|
&[cx.render(rsx!(div {} ))],
|
|
|
|
// key
|
|
None
|
|
)
|
|
})}
|
|
}
|
|
})
|
|
```
|