279 lines
9.6 KiB
Rust
279 lines
9.6 KiB
Rust
use crate::{
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h_stack, prelude::*, v_stack, Icon, IconElement, KeyBinding, Label, List, ListItem,
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ListSeparator, ListSubHeader,
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};
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use gpui::{
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px, Action, AppContext, DismissEvent, Div, EventEmitter, FocusHandle, FocusableView,
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IntoElement, Render, Subscription, View, VisualContext,
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};
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use menu::{SelectFirst, SelectLast, SelectNext, SelectPrev};
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use std::{rc::Rc, time::Duration};
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pub enum ContextMenuItem {
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Separator,
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Header(SharedString),
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Entry {
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label: SharedString,
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icon: Option<Icon>,
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handler: Rc<dyn Fn(&mut WindowContext)>,
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action: Option<Box<dyn Action>>,
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},
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}
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pub struct ContextMenu {
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items: Vec<ContextMenuItem>,
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focus_handle: FocusHandle,
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selected_index: Option<usize>,
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delayed: bool,
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_on_blur_subscription: Subscription,
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}
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impl FocusableView for ContextMenu {
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fn focus_handle(&self, _cx: &AppContext) -> FocusHandle {
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self.focus_handle.clone()
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}
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}
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impl EventEmitter<DismissEvent> for ContextMenu {}
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impl ContextMenu {
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pub fn build(
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cx: &mut WindowContext,
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f: impl FnOnce(Self, &mut WindowContext) -> Self,
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) -> View<Self> {
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cx.build_view(|cx| {
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let focus_handle = cx.focus_handle();
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let _on_blur_subscription = cx.on_blur(&focus_handle, |this: &mut ContextMenu, cx| {
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this.cancel(&menu::Cancel, cx)
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});
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f(
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Self {
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items: Default::default(),
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focus_handle,
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selected_index: None,
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delayed: false,
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_on_blur_subscription,
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},
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cx,
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)
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})
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}
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pub fn header(mut self, title: impl Into<SharedString>) -> Self {
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self.items.push(ContextMenuItem::Header(title.into()));
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self
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}
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pub fn separator(mut self) -> Self {
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self.items.push(ContextMenuItem::Separator);
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self
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}
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pub fn entry(
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mut self,
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label: impl Into<SharedString>,
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handler: impl Fn(&mut WindowContext) + 'static,
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) -> Self {
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self.items.push(ContextMenuItem::Entry {
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label: label.into(),
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handler: Rc::new(handler),
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icon: None,
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action: None,
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});
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self
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}
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pub fn action(mut self, label: impl Into<SharedString>, action: Box<dyn Action>) -> Self {
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self.items.push(ContextMenuItem::Entry {
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label: label.into(),
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action: Some(action.boxed_clone()),
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handler: Rc::new(move |cx| cx.dispatch_action(action.boxed_clone())),
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icon: None,
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});
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self
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}
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pub fn link(mut self, label: impl Into<SharedString>, action: Box<dyn Action>) -> Self {
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self.items.push(ContextMenuItem::Entry {
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label: label.into(),
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action: Some(action.boxed_clone()),
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handler: Rc::new(move |cx| cx.dispatch_action(action.boxed_clone())),
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icon: Some(Icon::Link),
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});
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self
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}
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pub fn confirm(&mut self, _: &menu::Confirm, cx: &mut ViewContext<Self>) {
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if let Some(ContextMenuItem::Entry { handler, .. }) =
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self.selected_index.and_then(|ix| self.items.get(ix))
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{
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(handler)(cx)
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}
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cx.emit(DismissEvent);
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}
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pub fn cancel(&mut self, _: &menu::Cancel, cx: &mut ViewContext<Self>) {
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cx.emit(DismissEvent);
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cx.emit(DismissEvent);
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}
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fn select_first(&mut self, _: &SelectFirst, cx: &mut ViewContext<Self>) {
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self.selected_index = self.items.iter().position(|item| item.is_selectable());
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cx.notify();
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}
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fn select_last(&mut self, _: &SelectLast, cx: &mut ViewContext<Self>) {
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for (ix, item) in self.items.iter().enumerate().rev() {
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if item.is_selectable() {
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self.selected_index = Some(ix);
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cx.notify();
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break;
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}
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}
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}
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fn select_next(&mut self, _: &SelectNext, cx: &mut ViewContext<Self>) {
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if let Some(ix) = self.selected_index {
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for (ix, item) in self.items.iter().enumerate().skip(ix + 1) {
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if item.is_selectable() {
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self.selected_index = Some(ix);
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cx.notify();
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break;
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}
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}
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} else {
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self.select_first(&Default::default(), cx);
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}
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}
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pub fn select_prev(&mut self, _: &SelectPrev, cx: &mut ViewContext<Self>) {
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if let Some(ix) = self.selected_index {
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for (ix, item) in self.items.iter().enumerate().take(ix).rev() {
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if item.is_selectable() {
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self.selected_index = Some(ix);
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cx.notify();
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break;
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}
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}
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} else {
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self.select_last(&Default::default(), cx);
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}
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}
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pub fn on_action_dispatch(&mut self, dispatched: &Box<dyn Action>, cx: &mut ViewContext<Self>) {
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if let Some(ix) = self.items.iter().position(|item| {
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if let ContextMenuItem::Entry {
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action: Some(action),
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..
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} = item
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{
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action.partial_eq(&**dispatched)
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} else {
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false
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}
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}) {
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self.selected_index = Some(ix);
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self.delayed = true;
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cx.notify();
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let action = dispatched.boxed_clone();
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cx.spawn(|this, mut cx| async move {
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cx.background_executor()
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.timer(Duration::from_millis(50))
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.await;
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this.update(&mut cx, |this, cx| {
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cx.dispatch_action(action);
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this.cancel(&Default::default(), cx)
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})
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})
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.detach_and_log_err(cx);
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} else {
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cx.propagate()
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}
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}
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}
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impl ContextMenuItem {
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fn is_selectable(&self) -> bool {
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matches!(self, Self::Entry { .. })
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}
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}
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impl Render for ContextMenu {
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type Element = Div;
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fn render(&mut self, cx: &mut ViewContext<Self>) -> Self::Element {
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div().elevation_2(cx).flex().flex_row().child(
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v_stack()
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.min_w(px(200.))
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.track_focus(&self.focus_handle)
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.on_mouse_down_out(cx.listener(|this, _, cx| this.cancel(&Default::default(), cx)))
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.key_context("menu")
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.on_action(cx.listener(ContextMenu::select_first))
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.on_action(cx.listener(ContextMenu::select_last))
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.on_action(cx.listener(ContextMenu::select_next))
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.on_action(cx.listener(ContextMenu::select_prev))
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.on_action(cx.listener(ContextMenu::confirm))
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.on_action(cx.listener(ContextMenu::cancel))
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.when(!self.delayed, |mut el| {
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for item in self.items.iter() {
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if let ContextMenuItem::Entry {
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action: Some(action),
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..
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} = item
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{
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el = el.on_boxed_action(
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action,
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cx.listener(ContextMenu::on_action_dispatch),
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);
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}
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}
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el
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})
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.flex_none()
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.child(
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List::new().children(self.items.iter().enumerate().map(
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|(ix, item)| match item {
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ContextMenuItem::Separator => ListSeparator.into_any_element(),
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ContextMenuItem::Header(header) => {
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ListSubHeader::new(header.clone()).into_any_element()
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}
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ContextMenuItem::Entry {
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label,
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handler,
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icon,
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action,
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} => {
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let handler = handler.clone();
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let label_element = if let Some(icon) = icon {
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h_stack()
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.gap_1()
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.child(Label::new(label.clone()))
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.child(IconElement::new(*icon))
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.into_any_element()
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} else {
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Label::new(label.clone()).into_any_element()
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};
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ListItem::new(label.clone())
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.inset(true)
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.selected(Some(ix) == self.selected_index)
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.on_click(move |_, cx| handler(cx))
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.child(
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h_stack()
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.w_full()
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.justify_between()
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.child(label_element)
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.children(action.as_ref().and_then(|action| {
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KeyBinding::for_action(&**action, cx)
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.map(|binding| div().ml_1().child(binding))
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})),
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)
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.into_any_element()
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}
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},
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)),
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),
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)
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}
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}
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