feat: push checkout (#14)

Reviewed-on: https://git.reya.su/reya/signed/pulls/14

crates/dock/src/lib.rs

@@ -1,15 +1,7 @@
-//! The Signed dock skin.
-//!
-//! The dock engine lives upstream (`gpui_base::dock` owns the layout tree,
-//! drags, zoom and persistence); this crate is the appearance the app used
-//! to vendor from gpui-component — a 44px tab bar that doubles as the
-//! window title bar, with pill tabs, window controls, title-bar dragging
-//! and previous/next tab buttons.
-//!
-//! Everything `gpui_component::dock` exports is re-exported here, so the app
-//! keeps importing the dock from a single place.
+use std::sync::Arc;
 
-use gpui::{Pixels, px};
+use gpui::{Context, Pixels, Window, px};
+use gpui_base::dock::PanelView;
 
 mod dock_area;
 mod invalid_panel;
@@ -19,20 +11,27 @@ mod window_controls;
 
 pub use dock_area::SignedDockSkin;
 pub use gpui_component::dock::{
-    AnyDrag, BasePanel, BasePanelView, ClosePanel, DockArea, DockAreaState, DockContext, DockEvent,
-    DockLayout, DockPlacement, DockState, DragPanel, DropIndicator, DropPlaceholderBounds,
-    DropTarget, Panel, PanelControl, PanelEvent, PanelHandle, PanelInfo, PanelState, PanelStyle,
-    PanelView, TitleStyle, ToggleZoom, panel_handle, register_panel,
+    BasePanel, DockArea, DockEvent, DockLayout, DockPlacement, Panel, PanelEvent, panel_handle,
 };
 
+/// Add an already-wrapped panel handle to the center of `area`.
+///
+/// Every panel entry point opens its panel there.
+pub fn add_center_panel(
+    area: &mut DockArea,
+    panel: Arc<dyn PanelView>,
+    window: &mut Window,
+    cx: &mut Context<DockArea>,
+) {
+    area.add_panel_view(panel, DockPlacement::Center, None, window, cx);
+}
+
 /// The fixed height of the tab bar, which doubles as the window title bar.
 pub const TAB_BAR_HEIGHT: Pixels = px(44.);
 
-/// Minimal i18n shim replacing gpui-component's `rust_i18n::t!()`, keeping the
-/// same `Dock.*` keys resolved to English so the crate has no i18n dependency.
+/// i18n shim resolving `Dock.*` keys to English, so the crate has no i18n dependency.
 pub(crate) fn t(key: &'static str) -> &'static str {
     match key {
-        "Dock.Unnamed" => "Unnamed",
         "Dock.Close" => "Close",
         "Dock.Zoom In" => "Zoom In",
         "Dock.Zoom Out" => "Zoom Out",