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Avoid panic by accessing view handle by global in wrong window
View handles are window specific but this global will be doing things in all windows, that would cause a panic when it attempted to update a status bar mode indicator in a background window Co-Authored-By: Mikayla Maki <mikayla@zed.dev>
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6a0e1d5345
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fc9687d163
@ -1,20 +1,60 @@
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use gpui::{elements::Label, AnyElement, Element, Entity, View, ViewContext};
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use gpui::{
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elements::{Empty, Label},
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AnyElement, Element, Entity, Subscription, View, ViewContext,
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};
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use settings::SettingsStore;
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use workspace::{item::ItemHandle, StatusItemView};
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use crate::state::Mode;
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use crate::{state::Mode, Vim, VimEvent, VimModeSetting};
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pub struct ModeIndicator {
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pub mode: Mode,
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pub mode: Option<Mode>,
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_subscription: Subscription,
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}
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impl ModeIndicator {
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pub fn new(mode: Mode) -> Self {
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Self { mode }
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pub fn new(cx: &mut ViewContext<Self>) -> Self {
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let handle = cx.handle().downgrade();
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let _subscription = cx.subscribe_global::<VimEvent, _>(move |&event, cx| {
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if let Some(mode_indicator) = handle.upgrade(cx) {
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match event {
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VimEvent::ModeChanged { mode } => {
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cx.update_window(mode_indicator.window_id(), |cx| {
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mode_indicator.update(cx, move |mode_indicator, cx| {
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mode_indicator.set_mode(mode, cx);
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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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cx.observe_global::<SettingsStore, _>(move |mode_indicator, cx| {
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if settings::get::<VimModeSetting>(cx).0 {
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mode_indicator.mode = cx
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.has_global::<Vim>()
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.then(|| cx.global::<Vim>().state.mode);
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} else {
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mode_indicator.mode.take();
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}
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})
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.detach();
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// Vim doesn't exist in some tests
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let mode = cx
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.has_global::<Vim>()
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.then(|| cx.global::<Vim>().state.mode);
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Self {
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mode,
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_subscription,
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}
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}
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pub fn set_mode(&mut self, mode: Mode, cx: &mut ViewContext<Self>) {
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if mode != self.mode {
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self.mode = mode;
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if self.mode != Some(mode) {
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self.mode = Some(mode);
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cx.notify();
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}
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}
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@ -30,11 +70,16 @@ impl View for ModeIndicator {
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}
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fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
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let Some(mode) = self.mode.as_ref() else {
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return Empty::new().into_any();
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};
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let theme = &theme::current(cx).workspace.status_bar;
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// we always choose text to be 12 monospace characters
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// so that as the mode indicator changes, the rest of the
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// UI stays still.
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let text = match self.mode {
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let text = match mode {
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Mode::Normal => "-- NORMAL --",
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Mode::Insert => "-- INSERT --",
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Mode::Visual { line: false } => "-- VISUAL --",
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@ -215,7 +215,7 @@ async fn test_status_indicator(
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assert_eq!(
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cx.workspace(|_, cx| mode_indicator.read(cx).mode),
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Mode::Normal
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Some(Mode::Normal)
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);
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// shows the correct mode
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@ -223,7 +223,7 @@ async fn test_status_indicator(
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deterministic.run_until_parked();
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assert_eq!(
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cx.workspace(|_, cx| mode_indicator.read(cx).mode),
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Mode::Insert
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Some(Mode::Insert)
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);
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// shows even in search
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@ -231,7 +231,7 @@ async fn test_status_indicator(
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deterministic.run_until_parked();
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assert_eq!(
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cx.workspace(|_, cx| mode_indicator.read(cx).mode),
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Mode::Visual { line: false }
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Some(Mode::Visual { line: false })
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);
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// hides if vim mode is disabled
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@ -239,15 +239,15 @@ async fn test_status_indicator(
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deterministic.run_until_parked();
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cx.workspace(|workspace, cx| {
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let status_bar = workspace.status_bar().read(cx);
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let mode_indicator = status_bar.item_of_type::<ModeIndicator>();
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assert!(mode_indicator.is_none());
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let mode_indicator = status_bar.item_of_type::<ModeIndicator>().unwrap();
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assert!(mode_indicator.read(cx).mode.is_none());
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});
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cx.enable_vim();
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deterministic.run_until_parked();
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cx.workspace(|workspace, cx| {
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let status_bar = workspace.status_bar().read(cx);
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let mode_indicator = status_bar.item_of_type::<ModeIndicator>();
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assert!(mode_indicator.is_some());
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let mode_indicator = status_bar.item_of_type::<ModeIndicator>().unwrap();
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assert!(mode_indicator.read(cx).mode.is_some());
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});
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}
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@ -43,6 +43,10 @@ impl<'a> VimTestContext<'a> {
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toolbar.add_item(project_search_bar, cx);
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})
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});
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workspace.status_bar().update(cx, |status_bar, cx| {
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let vim_mode_indicator = cx.add_view(ModeIndicator::new);
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status_bar.add_right_item(vim_mode_indicator, cx);
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});
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});
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Self { cx }
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@ -43,6 +43,11 @@ struct Number(u8);
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actions!(vim, [Tab, Enter]);
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impl_actions!(vim, [Number, SwitchMode, PushOperator]);
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#[derive(Copy, Clone, Debug)]
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enum VimEvent {
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ModeChanged { mode: Mode },
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}
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pub fn init(cx: &mut AppContext) {
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settings::register::<VimModeSetting>(cx);
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@ -121,8 +126,6 @@ pub fn observe_keystrokes(cx: &mut WindowContext) {
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pub struct Vim {
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active_editor: Option<WeakViewHandle<Editor>>,
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editor_subscription: Option<Subscription>,
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mode_indicator: Option<ViewHandle<ModeIndicator>>,
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enabled: bool,
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state: VimState,
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}
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@ -181,9 +184,7 @@ impl Vim {
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self.state.mode = mode;
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self.state.operator_stack.clear();
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if let Some(mode_indicator) = &self.mode_indicator {
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mode_indicator.update(cx, |mode_indicator, cx| mode_indicator.set_mode(mode, cx))
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}
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cx.emit_global(VimEvent::ModeChanged { mode });
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// Sync editor settings like clip mode
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self.sync_vim_settings(cx);
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@ -271,44 +272,6 @@ impl Vim {
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}
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}
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fn sync_mode_indicator(cx: &mut WindowContext) {
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let Some(workspace) = cx.root_view()
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.downcast_ref::<Workspace>()
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.map(|workspace| workspace.downgrade()) else {
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return;
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};
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cx.spawn(|mut cx| async move {
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workspace.update(&mut cx, |workspace, cx| {
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Vim::update(cx, |vim, cx| {
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workspace.status_bar().update(cx, |status_bar, cx| {
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let current_position = status_bar.position_of_item::<ModeIndicator>();
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if vim.enabled && current_position.is_none() {
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if vim.mode_indicator.is_none() {
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vim.mode_indicator =
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Some(cx.add_view(|_| ModeIndicator::new(vim.state.mode)));
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};
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let mode_indicator = vim.mode_indicator.as_ref().unwrap();
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let position = status_bar
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.position_of_item::<language_selector::ActiveBufferLanguage>();
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if let Some(position) = position {
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status_bar.insert_item_after(position, mode_indicator.clone(), cx)
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} else {
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status_bar.add_left_item(mode_indicator.clone(), cx)
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}
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} else if !vim.enabled {
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if let Some(position) = current_position {
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status_bar.remove_item_at(position, cx)
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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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.detach_and_log_err(cx);
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}
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fn set_enabled(&mut self, enabled: bool, cx: &mut AppContext) {
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if self.enabled != enabled {
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self.enabled = enabled;
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@ -359,8 +322,6 @@ impl Vim {
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self.unhook_vim_settings(editor, cx);
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}
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});
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Vim::sync_mode_indicator(cx);
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}
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fn unhook_vim_settings(&self, editor: &mut Editor, cx: &mut ViewContext<Editor>) {
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@ -308,6 +308,7 @@ pub fn initialize_workspace(
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);
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let active_buffer_language =
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cx.add_view(|_| language_selector::ActiveBufferLanguage::new(workspace));
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let vim_mode_indicator = cx.add_view(|cx| vim::ModeIndicator::new(cx));
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let feedback_button = cx.add_view(|_| {
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feedback::deploy_feedback_button::DeployFeedbackButton::new(workspace)
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});
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@ -319,6 +320,7 @@ pub fn initialize_workspace(
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status_bar.add_right_item(feedback_button, cx);
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status_bar.add_right_item(copilot, cx);
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status_bar.add_right_item(active_buffer_language, cx);
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status_bar.add_right_item(vim_mode_indicator, cx);
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status_bar.add_right_item(cursor_position, cx);
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});
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