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Add a proc macro for deriving override structs with optional fields

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This commit is contained in:
Nathan Sobo 2023-08-17 09:39:23 -06:00
parent b95b2af3e0
commit ab9356e9d8
9 changed files with 209 additions and 96 deletions
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100
crates/gpui/playground/src/element.rs
View file

@ -1,7 +1,7 @@
use crate::{
adapter::Adapter,
color::Hsla,
style::{Display, ElementStyle, Fill, Overflow, Position},
style::{Display, ElementStyle, ElementStyleOverrides, Fill, Overflow, Position},
};
use anyhow::Result;
pub use gpui::LayoutContext;
@ -27,6 +27,7 @@ pub struct Layout<'a, E: ?Sized> {
pub struct ElementMetadata<V> {
pub style: ElementStyle,
pub hover_style: ElementStyleOverrides,
pub handlers: Vec<EventHandler<V>>,
}
@ -50,6 +51,7 @@ impl<V> Default for ElementMetadata<V> {
fn default() -> Self {
Self {
style: ElementStyle::default(),
hover_style: ElementStyleOverrides::default(),
handlers: Vec::new(),
}
}
@ -58,8 +60,7 @@ impl<V> Default for ElementMetadata<V> {
pub trait Element<V: 'static>: 'static {
type Layout: 'static;
fn style_mut(&mut self) -> &mut ElementStyle;
fn handlers_mut(&mut self) -> &mut Vec<EventHandler<V>>;
fn metadata(&mut self) -> &mut ElementMetadata<V>;
fn layout(&mut self, view: &mut V, cx: &mut LayoutContext<V>)
-> Result<(NodeId, Self::Layout)>;
@ -126,7 +127,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.handlers_mut().push(EventHandler {
self.metadata().handlers.push(EventHandler {
handler: Rc::new(move |view, event, event_cx| {
let event = event.downcast_ref::<MouseButtonEvent>().unwrap();
if event.button == button && event.is_down {
@ -147,7 +148,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.handlers_mut().push(EventHandler {
self.metadata().handlers.push(EventHandler {
handler: Rc::new(move |view, event, event_cx| {
let event = event.downcast_ref::<MouseButtonEvent>().unwrap();
if event.button == button && event.is_down {
@ -168,7 +169,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.handlers_mut().push(EventHandler {
self.metadata().handlers.push(EventHandler {
handler: Rc::new(move |view, event, event_cx| {
let event = event.downcast_ref::<MouseButtonEvent>().unwrap();
if event.button == button && !event.is_down {
@ -189,7 +190,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.handlers_mut().push(EventHandler {
self.metadata().handlers.push(EventHandler {
handler: Rc::new(move |view, event, event_cx| {
let event = event.downcast_ref::<MouseButtonEvent>().unwrap();
if event.button == button && !event.is_down {
@ -208,7 +209,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().display = Display::Block;
self.metadata().style.display = Display::Block;
self
}
@ -216,7 +217,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().display = Display::Flex;
self.metadata().style.display = Display::Flex;
self
}
@ -224,7 +225,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().display = Display::Grid;
self.metadata().style.display = Display::Grid;
self
}
@ -234,8 +235,8 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Visible;
self.style_mut().overflow.y = Overflow::Visible;
self.metadata().style.overflow.x = Overflow::Visible;
self.metadata().style.overflow.y = Overflow::Visible;
self
}
@ -243,8 +244,8 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Hidden;
self.style_mut().overflow.y = Overflow::Hidden;
self.metadata().style.overflow.x = Overflow::Hidden;
self.metadata().style.overflow.y = Overflow::Hidden;
self
}
@ -252,8 +253,8 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Scroll;
self.style_mut().overflow.y = Overflow::Scroll;
self.metadata().style.overflow.x = Overflow::Scroll;
self.metadata().style.overflow.y = Overflow::Scroll;
self
}
@ -261,7 +262,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Visible;
self.metadata().style.overflow.x = Overflow::Visible;
self
}
@ -269,7 +270,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Hidden;
self.metadata().style.overflow.x = Overflow::Hidden;
self
}
@ -277,7 +278,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.x = Overflow::Scroll;
self.metadata().style.overflow.x = Overflow::Scroll;
self
}
@ -285,7 +286,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.y = Overflow::Visible;
self.metadata().style.overflow.y = Overflow::Visible;
self
}
@ -293,7 +294,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.y = Overflow::Hidden;
self.metadata().style.overflow.y = Overflow::Hidden;
self
}
@ -301,7 +302,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().overflow.y = Overflow::Scroll;
self.metadata().style.overflow.y = Overflow::Scroll;
self
}
@ -311,7 +312,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().position = Position::Relative;
self.metadata().style.position = Position::Relative;
self
}
@ -319,7 +320,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().position = Position::Absolute;
self.metadata().style.position = Position::Absolute;
self
}
@ -329,10 +330,10 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().inset.top = length;
self.style_mut().inset.right = length;
self.style_mut().inset.bottom = length;
self.style_mut().inset.left = length;
self.metadata().style.inset.top = length;
self.metadata().style.inset.right = length;
self.metadata().style.inset.bottom = length;
self.metadata().style.inset.left = length;
self
}
@ -340,7 +341,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.width = width.into();
self.metadata().style.size.width = width.into();
self
}
@ -348,7 +349,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.width = Length::Auto;
self.metadata().style.size.width = Length::Auto;
self
}
@ -357,7 +358,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.width = length;
self.metadata().style.size.width = length;
self
}
@ -366,7 +367,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().min_size.width = length;
self.metadata().style.min_size.width = length;
self
}
@ -374,7 +375,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.height = height.into();
self.metadata().style.size.height = height.into();
self
}
@ -382,7 +383,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.height = Length::Auto;
self.metadata().style.size.height = Length::Auto;
self
}
@ -391,7 +392,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().size.height = height;
self.metadata().style.size.height = height;
self
}
@ -400,7 +401,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().min_size.height = length;
self.metadata().style.min_size.height = length;
self
}
@ -408,7 +409,7 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().fill = fill.into();
self.metadata().style.fill = fill.into();
self
}
@ -416,15 +417,14 @@ pub trait Element<V: 'static>: 'static {
where
Self: Sized,
{
self.style_mut().text_color = Some(color.into());
self.metadata().style.text_color = Some(color.into());
self
}
}
// Object-safe counterpart of Element used by AnyElement to store elements as trait objects.
trait ElementObject<V> {
fn style_mut(&mut self) -> &mut ElementStyle;
fn handlers_mut(&mut self) -> &mut Vec<EventHandler<V>>;
fn metadata(&mut self) -> &mut ElementMetadata<V>;
fn layout(&mut self, view: &mut V, cx: &mut LayoutContext<V>)
-> Result<(NodeId, Box<dyn Any>)>;
fn paint(
@ -436,12 +436,8 @@ trait ElementObject<V> {
}
impl<V: 'static, E: Element<V>> ElementObject<V> for E {
fn style_mut(&mut self) -> &mut ElementStyle {
Element::style_mut(self)
}
fn handlers_mut(&mut self) -> &mut Vec<EventHandler<V>> {
Element::handlers_mut(self)
fn metadata(&mut self) -> &mut ElementMetadata<V> {
Element::metadata(self)
}
fn layout(
@ -490,7 +486,7 @@ impl<V: 'static> AnyElement<V> {
}
pub fn push_text_style(&mut self, cx: &mut impl RenderContext) -> bool {
let text_style = self.element.style_mut().text_style();
let text_style = self.element.metadata().style.text_style();
if let Some(text_style) = text_style {
let mut current_text_style = cx.text_style();
text_style.apply(&mut current_text_style);
@ -516,7 +512,7 @@ impl<V: 'static> AnyElement<V> {
from_element: element_layout.as_mut(),
};
for event_handler in self.element.handlers_mut().iter().cloned() {
for event_handler in self.element.metadata().handlers.iter().cloned() {
let EngineLayout { order, bounds } = layout.from_engine;
let view_id = cx.view_id();
@ -551,12 +547,8 @@ impl<V: 'static> AnyElement<V> {
impl<V: 'static> Element<V> for AnyElement<V> {
type Layout = ();
fn style_mut(&mut self) -> &mut ElementStyle {
self.element.style_mut()
}
fn handlers_mut(&mut self) -> &mut Vec<EventHandler<V>> {
self.element.handlers_mut()
fn metadata(&mut self) -> &mut ElementMetadata<V> {
self.element.metadata()
}
fn layout(