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use std::{cell::RefCell, rc::Rc};
use gpui::{
AnyElement, App, Context, Corner, DismissEvent, Element, ElementId, Entity, Focusable,
GlobalElementId, InspectorElementId, InteractiveElement, IntoElement, MouseButton,
MouseDownEvent, ParentElement, Pixels, Point, StyleRefinement, Styled, Subscription, Window,
anchored, deferred, div, prelude::FluentBuilder, px,
};
use crate::menu::PopupMenu;
/// A extension trait for adding a context menu to an element.
pub trait ContextMenuExt: ParentElement + Styled {
/// Add a context menu to the element.
///
/// This will changed the element to be `relative` positioned, and add a child `ContextMenu` element.
/// Because the `ContextMenu` element is positioned `absolute`, it will not affect the layout of the parent element.
fn context_menu(
self,
f: impl Fn(PopupMenu, &mut Window, &mut Context<PopupMenu>) -> PopupMenu + 'static,
) -> ContextMenu<Self> {
ContextMenu::new("context-menu", self).menu(f)
}
}
impl<E: ParentElement + Styled> ContextMenuExt for E {}
/// A context menu that can be shown on right-click.
pub struct ContextMenu<E: ParentElement + Styled + Sized> {
id: ElementId,
element: Option<E>,
menu: Option<Rc<dyn Fn(PopupMenu, &mut Window, &mut Context<PopupMenu>) -> PopupMenu>>,
// This is not in use, just for style refinement forwarding.
_ignore_style: StyleRefinement,
anchor: Corner,
}
impl<E: ParentElement + Styled> ContextMenu<E> {
/// Create a new context menu with the given ID.
pub fn new(id: impl Into<ElementId>, element: E) -> Self {
Self {
id: id.into(),
element: Some(element),
menu: None,
anchor: Corner::TopLeft,
_ignore_style: StyleRefinement::default(),
}
}
/// Build the context menu using the given builder function.
#[must_use]
fn menu<F>(mut self, builder: F) -> Self
where
F: Fn(PopupMenu, &mut Window, &mut Context<PopupMenu>) -> PopupMenu + 'static,
{
self.menu = Some(Rc::new(builder));
self
}
fn with_element_state<R>(
&mut self,
id: &GlobalElementId,
window: &mut Window,
cx: &mut App,
f: impl FnOnce(&mut Self, &mut ContextMenuState, &mut Window, &mut App) -> R,
) -> R {
window.with_optional_element_state::<ContextMenuState, _>(
Some(id),
|element_state, window| {
let mut element_state = element_state.unwrap().unwrap_or_default();
let result = f(self, &mut element_state, window, cx);
(result, Some(element_state))
},
)
}
}
impl<E: ParentElement + Styled> ParentElement for ContextMenu<E> {
fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
if let Some(element) = &mut self.element {
element.extend(elements);
}
}
}
impl<E: ParentElement + Styled> Styled for ContextMenu<E> {
fn style(&mut self) -> &mut StyleRefinement {
if let Some(element) = &mut self.element {
element.style()
} else {
&mut self._ignore_style
}
}
}
impl<E: ParentElement + Styled + IntoElement + 'static> IntoElement for ContextMenu<E> {
type Element = Self;
fn into_element(self) -> Self::Element {
self
}
}
struct ContextMenuSharedState {
menu_view: Option<Entity<PopupMenu>>,
open: bool,
position: Point<Pixels>,
_subscription: Option<Subscription>,
}
pub struct ContextMenuState {
element: Option<AnyElement>,
shared_state: Rc<RefCell<ContextMenuSharedState>>,
}
impl Default for ContextMenuState {
fn default() -> Self {
Self {
element: None,
shared_state: Rc::new(RefCell::new(ContextMenuSharedState {
menu_view: None,
open: false,
position: Default::default(),
_subscription: None,
})),
}
}
}
impl<E: ParentElement + Styled + IntoElement + 'static> Element for ContextMenu<E> {
type RequestLayoutState = ContextMenuState;
type PrepaintState = ();
fn id(&self) -> Option<ElementId> {
Some(self.id.clone())
}
fn source_location(&self) -> Option<&'static std::panic::Location<'static>> {
None
}
fn request_layout(
&mut self,
id: Option<&gpui::GlobalElementId>,
_: Option<&gpui::InspectorElementId>,
window: &mut Window,
cx: &mut App,
) -> (gpui::LayoutId, Self::RequestLayoutState) {
let anchor = self.anchor;
self.with_element_state(
id.unwrap(),
window,
cx,
|this, state: &mut ContextMenuState, window, cx| {
let (position, open) = {
let shared_state = state.shared_state.borrow();
(shared_state.position, shared_state.open)
};
let menu_view = state.shared_state.borrow().menu_view.clone();
let mut menu_element = None;
if open {
let has_menu_item = menu_view
.as_ref()
.map(|menu| !menu.read(cx).is_empty())
.unwrap_or(false);
if has_menu_item {
menu_element = Some(
deferred(
anchored().child(
div()
.w(window.bounds().size.width)
.h(window.bounds().size.height)
.occlude()
.child(
anchored()
.position(position)
.snap_to_window_with_margin(px(8.))
.anchor(anchor)
.when_some(menu_view, |this, menu| {
// Focus the menu, so that can be handle the action.
if !menu
.focus_handle(cx)
.contains_focused(window, cx)
{
menu.focus_handle(cx).focus(window);
}
this.child(menu.clone())
}),
),
),
)
.with_priority(1)
.into_any(),
);
}
}
let mut element = this
.element
.take()
.expect("Element should exists.")
.children(menu_element)
.into_any_element();
let layout_id = element.request_layout(window, cx);
(
layout_id,
ContextMenuState {
element: Some(element),
..Default::default()
},
)
},
)
}
fn prepaint(
&mut self,
_: Option<&gpui::GlobalElementId>,
_: Option<&InspectorElementId>,
_: gpui::Bounds<gpui::Pixels>,
request_layout: &mut Self::RequestLayoutState,
window: &mut Window,
cx: &mut App,
) -> Self::PrepaintState {
if let Some(element) = &mut request_layout.element {
element.prepaint(window, cx);
}
}
fn paint(
&mut self,
id: Option<&gpui::GlobalElementId>,
_: Option<&InspectorElementId>,
bounds: gpui::Bounds<gpui::Pixels>,
request_layout: &mut Self::RequestLayoutState,
_: &mut Self::PrepaintState,
window: &mut Window,
cx: &mut App,
) {
if let Some(element) = &mut request_layout.element {
element.paint(window, cx);
}
// Take the builder before setting up element state to avoid borrow issues
let builder = self.menu.clone();
self.with_element_state(
id.unwrap(),
window,
cx,
|_view, state: &mut ContextMenuState, window, _| {
let shared_state = state.shared_state.clone();
// When right mouse click, to build content menu, and show it at the mouse position.
window.on_mouse_event(move |event: &MouseDownEvent, phase, window, cx| {
if phase.bubble()
&& event.button == MouseButton::Right
&& bounds.contains(&event.position)
{
{
let mut shared_state = shared_state.borrow_mut();
// Clear any existing menu view to allow immediate replacement
// Set the new position and open the menu
shared_state.menu_view = None;
shared_state._subscription = None;
shared_state.position = event.position;
shared_state.open = true;
}
// Use defer to build the menu in the next frame, avoiding race conditions
window.defer(cx, {
let shared_state = shared_state.clone();
let builder = builder.clone();
move |window, cx| {
let menu = PopupMenu::build(window, cx, move |menu, window, cx| {
let Some(build) = &builder else {
return menu;
};
build(menu, window, cx)
});
// Set up the subscription for dismiss handling
let _subscription = window.subscribe(&menu, cx, {
let shared_state = shared_state.clone();
move |_, _: &DismissEvent, window, _cx| {
shared_state.borrow_mut().open = false;
window.refresh();
}
});
// Update the shared state with the built menu and subscription
{
let mut state = shared_state.borrow_mut();
state.menu_view = Some(menu.clone());
state._subscription = Some(_subscription);
window.refresh();
}
}
});
}
});
},
);
}
}