WIP

crates/workspace2/src/status_bar.rs

@@ -0,0 +1,271 @@
+use std::ops::Range;
+
+use crate::{ItemHandle, Pane};
+use gpui::{
+    elements::*,
+    geometry::{
+        rect::RectF,
+        vector::{vec2f, Vector2F},
+    },
+    json::{json, ToJson},
+    AnyElement, AnyViewHandle, Entity, SizeConstraint, Subscription, View, ViewContext, ViewHandle,
+    WindowContext,
+};
+
+pub trait StatusItemView: View {
+    fn set_active_pane_item(
+        &mut self,
+        active_pane_item: Option<&dyn crate::ItemHandle>,
+        cx: &mut ViewContext<Self>,
+    );
+}
+
+trait StatusItemViewHandle {
+    fn as_any(&self) -> &AnyViewHandle;
+    fn set_active_pane_item(
+        &self,
+        active_pane_item: Option<&dyn ItemHandle>,
+        cx: &mut WindowContext,
+    );
+    fn ui_name(&self) -> &'static str;
+}
+
+pub struct StatusBar {
+    left_items: Vec<Box<dyn StatusItemViewHandle>>,
+    right_items: Vec<Box<dyn StatusItemViewHandle>>,
+    active_pane: ViewHandle<Pane>,
+    _observe_active_pane: Subscription,
+}
+
+impl Entity for StatusBar {
+    type Event = ();
+}
+
+impl View for StatusBar {
+    fn ui_name() -> &'static str {
+        "StatusBar"
+    }
+
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
+        let theme = &theme::current(cx).workspace.status_bar;
+
+        StatusBarElement {
+            left: Flex::row()
+                .with_children(self.left_items.iter().map(|i| {
+                    ChildView::new(i.as_any(), cx)
+                        .aligned()
+                        .contained()
+                        .with_margin_right(theme.item_spacing)
+                }))
+                .into_any(),
+            right: Flex::row()
+                .with_children(self.right_items.iter().rev().map(|i| {
+                    ChildView::new(i.as_any(), cx)
+                        .aligned()
+                        .contained()
+                        .with_margin_left(theme.item_spacing)
+                }))
+                .into_any(),
+        }
+        .contained()
+        .with_style(theme.container)
+        .constrained()
+        .with_height(theme.height)
+        .into_any()
+    }
+}
+
+impl StatusBar {
+    pub fn new(active_pane: &ViewHandle<Pane>, cx: &mut ViewContext<Self>) -> Self {
+        let mut this = Self {
+            left_items: Default::default(),
+            right_items: Default::default(),
+            active_pane: active_pane.clone(),
+            _observe_active_pane: cx
+                .observe(active_pane, |this, _, cx| this.update_active_pane_item(cx)),
+        };
+        this.update_active_pane_item(cx);
+        this
+    }
+
+    pub fn add_left_item<T>(&mut self, item: ViewHandle<T>, cx: &mut ViewContext<Self>)
+    where
+        T: 'static + StatusItemView,
+    {
+        self.left_items.push(Box::new(item));
+        cx.notify();
+    }
+
+    pub fn item_of_type<T: StatusItemView>(&self) -> Option<ViewHandle<T>> {
+        self.left_items
+            .iter()
+            .chain(self.right_items.iter())
+            .find_map(|item| item.as_any().clone().downcast())
+    }
+
+    pub fn position_of_item<T>(&self) -> Option<usize>
+    where
+        T: StatusItemView,
+    {
+        for (index, item) in self.left_items.iter().enumerate() {
+            if item.as_ref().ui_name() == T::ui_name() {
+                return Some(index);
+            }
+        }
+        for (index, item) in self.right_items.iter().enumerate() {
+            if item.as_ref().ui_name() == T::ui_name() {
+                return Some(index + self.left_items.len());
+            }
+        }
+        return None;
+    }
+
+    pub fn insert_item_after<T>(
+        &mut self,
+        position: usize,
+        item: ViewHandle<T>,
+        cx: &mut ViewContext<Self>,
+    ) where
+        T: 'static + StatusItemView,
+    {
+        if position < self.left_items.len() {
+            self.left_items.insert(position + 1, Box::new(item))
+        } else {
+            self.right_items
+                .insert(position + 1 - self.left_items.len(), Box::new(item))
+        }
+        cx.notify()
+    }
+
+    pub fn remove_item_at(&mut self, position: usize, cx: &mut ViewContext<Self>) {
+        if position < self.left_items.len() {
+            self.left_items.remove(position);
+        } else {
+            self.right_items.remove(position - self.left_items.len());
+        }
+        cx.notify();
+    }
+
+    pub fn add_right_item<T>(&mut self, item: ViewHandle<T>, cx: &mut ViewContext<Self>)
+    where
+        T: 'static + StatusItemView,
+    {
+        self.right_items.push(Box::new(item));
+        cx.notify();
+    }
+
+    pub fn set_active_pane(&mut self, active_pane: &ViewHandle<Pane>, cx: &mut ViewContext<Self>) {
+        self.active_pane = active_pane.clone();
+        self._observe_active_pane =
+            cx.observe(active_pane, |this, _, cx| this.update_active_pane_item(cx));
+        self.update_active_pane_item(cx);
+    }
+
+    fn update_active_pane_item(&mut self, cx: &mut ViewContext<Self>) {
+        let active_pane_item = self.active_pane.read(cx).active_item();
+        for item in self.left_items.iter().chain(&self.right_items) {
+            item.set_active_pane_item(active_pane_item.as_deref(), cx);
+        }
+    }
+}
+
+impl<T: StatusItemView> StatusItemViewHandle for ViewHandle<T> {
+    fn as_any(&self) -> &AnyViewHandle {
+        self
+    }
+
+    fn set_active_pane_item(
+        &self,
+        active_pane_item: Option<&dyn ItemHandle>,
+        cx: &mut WindowContext,
+    ) {
+        self.update(cx, |this, cx| {
+            this.set_active_pane_item(active_pane_item, cx)
+        });
+    }
+
+    fn ui_name(&self) -> &'static str {
+        T::ui_name()
+    }
+}
+
+impl From<&dyn StatusItemViewHandle> for AnyViewHandle {
+    fn from(val: &dyn StatusItemViewHandle) -> Self {
+        val.as_any().clone()
+    }
+}
+
+struct StatusBarElement {
+    left: AnyElement<StatusBar>,
+    right: AnyElement<StatusBar>,
+}
+
+impl Element<StatusBar> for StatusBarElement {
+    type LayoutState = ();
+    type PaintState = ();
+
+    fn layout(
+        &mut self,
+        mut constraint: SizeConstraint,
+        view: &mut StatusBar,
+        cx: &mut ViewContext<StatusBar>,
+    ) -> (Vector2F, Self::LayoutState) {
+        let max_width = constraint.max.x();
+        constraint.min = vec2f(0., constraint.min.y());
+
+        let right_size = self.right.layout(constraint, view, cx);
+        let constraint = SizeConstraint::new(
+            vec2f(0., constraint.min.y()),
+            vec2f(max_width - right_size.x(), constraint.max.y()),
+        );
+
+        self.left.layout(constraint, view, cx);
+
+        (vec2f(max_width, right_size.y()), ())
+    }
+
+    fn paint(
+        &mut self,
+        bounds: RectF,
+        visible_bounds: RectF,
+        _: &mut Self::LayoutState,
+        view: &mut StatusBar,
+        cx: &mut ViewContext<StatusBar>,
+    ) -> Self::PaintState {
+        let origin_y = bounds.upper_right().y();
+        let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
+
+        let left_origin = vec2f(bounds.lower_left().x(), origin_y);
+        self.left.paint(left_origin, visible_bounds, view, cx);
+
+        let right_origin = vec2f(bounds.upper_right().x() - self.right.size().x(), origin_y);
+        self.right.paint(right_origin, visible_bounds, view, cx);
+    }
+
+    fn rect_for_text_range(
+        &self,
+        _: Range<usize>,
+        _: RectF,
+        _: RectF,
+        _: &Self::LayoutState,
+        _: &Self::PaintState,
+        _: &StatusBar,
+        _: &ViewContext<StatusBar>,
+    ) -> Option<RectF> {
+        None
+    }
+
+    fn debug(
+        &self,
+        bounds: RectF,
+        _: &Self::LayoutState,
+        _: &Self::PaintState,
+        _: &StatusBar,
+        _: &ViewContext<StatusBar>,
+    ) -> serde_json::Value {
+        json!({
+            "type": "StatusBarElement",
+            "bounds": bounds.to_json()
+        })
+    }
+}