diff --git a/src/dock.js b/src/dock.js
index 7ddc55883..585b2441d 100644
--- a/src/dock.js
+++ b/src/dock.js
@@ -336,24 +336,250 @@ module.exports = class Dock {
 
   // PaneContainer-delegating methods
 
+  /*
+  Section: Event Subscription
+  */
+
+  // Essential: Invoke the given callback with all current and future text
+  // editors in the dock.
+  //
+  // * `callback` {Function} to be called with current and future text editors.
+  //   * `editor` An {TextEditor} that is present in {::getTextEditors} at the time
+  //     of subscription or that is added at some later time.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observeTextEditors (callback) {
+    for (const textEditor of this.getTextEditors()) {
+      callback(textEditor)
+    }
+    return this.onDidAddTextEditor(({textEditor}) => callback(textEditor))
+  }
+
+  // Essential: Invoke the given callback with all current and future panes items
+  // in the dock.
+  //
+  // * `callback` {Function} to be called with current and future pane items.
+  //   * `item` An item that is present in {::getPaneItems} at the time of
+  //      subscription or that is added at some later time.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observePaneItems (callback) {
+    return this.paneContainer.observePaneItems(callback)
+  }
+
+  // Essential: Invoke the given callback when the active pane item changes.
+  //
+  // Because observers are invoked synchronously, it's important not to perform
+  // any expensive operations via this method. Consider
+  // {::onDidStopChangingActivePaneItem} to delay operations until after changes
+  // stop occurring.
+  //
+  // * `callback` {Function} to be called when the active pane item changes.
+  //   * `item` The active pane item.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidChangeActivePaneItem (callback) {
+    return this.paneContainer.onDidChangeActivePaneItem(callback)
+  }
+
+  // Essential: Invoke the given callback when the active pane item stops
+  // changing.
+  //
+  // Observers are called asynchronously 100ms after the last active pane item
+  // change. Handling changes here rather than in the synchronous
+  // {::onDidChangeActivePaneItem} prevents unneeded work if the user is quickly
+  // changing or closing tabs and ensures critical UI feedback, like changing the
+  // highlighted tab, gets priority over work that can be done asynchronously.
+  //
+  // * `callback` {Function} to be called when the active pane item stopts
+  //   changing.
+  //   * `item` The active pane item.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidStopChangingActivePaneItem (callback) {
+    return this.paneContainer.onDidStopChangingActivePaneItem(callback)
+  }
+
+  // Essential: Invoke the given callback with the current active pane item and
+  // with all future active pane items in the dock.
+  //
+  // * `callback` {Function} to be called when the active pane item changes.
+  //   * `item` The current active pane item.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observeActivePaneItem (callback) {
+    return this.paneContainer.observeActivePaneItem(callback)
+  }
+
+  // Extended: Invoke the given callback when a pane is added to the dock.
+  //
+  // * `callback` {Function} to be called panes are added.
+  //   * `event` {Object} with the following keys:
+  //     * `pane` The added pane.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidAddPane (callback) {
+    return this.paneContainer.onDidAddPane(callback)
+  }
+
+  // Extended: Invoke the given callback before a pane is destroyed in the
+  // dock.
+  //
+  // * `callback` {Function} to be called before panes are destroyed.
+  //   * `event` {Object} with the following keys:
+  //     * `pane` The pane to be destroyed.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onWillDestroyPane (callback) {
+    return this.paneContainer.onWillDestroyPane(callback)
+  }
+
+  // Extended: Invoke the given callback when a pane is destroyed in the dock.
+  //
+  // * `callback` {Function} to be called panes are destroyed.
+  //   * `event` {Object} with the following keys:
+  //     * `pane` The destroyed pane.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidDestroyPane (callback) {
+    return this.paneContainer.onDidDestroyPane(callback)
+  }
+
+  // Extended: Invoke the given callback with all current and future panes in the
+  // dock.
+  //
+  // * `callback` {Function} to be called with current and future panes.
+  //   * `pane` A {Pane} that is present in {::getPanes} at the time of
+  //      subscription or that is added at some later time.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observePanes (callback) {
+    return this.paneContainer.observePanes(callback)
+  }
+
+  // Extended: Invoke the given callback when the active pane changes.
+  //
+  // * `callback` {Function} to be called when the active pane changes.
+  //   * `pane` A {Pane} that is the current return value of {::getActivePane}.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidChangeActivePane (callback) {
+    return this.paneContainer.onDidChangeActivePane(callback)
+  }
+
+  // Extended: Invoke the given callback with the current active pane and when
+  // the active pane changes.
+  //
+  // * `callback` {Function} to be called with the current and future active#
+  //   panes.
+  //   * `pane` A {Pane} that is the current return value of {::getActivePane}.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  observeActivePane (callback) {
+    return this.paneContainer.observeActivePane(callback)
+  }
+
+  // Extended: Invoke the given callback when a pane item is added to the dock.
+  //
+  // * `callback` {Function} to be called when pane items are added.
+  //   * `event` {Object} with the following keys:
+  //     * `item` The added pane item.
+  //     * `pane` {Pane} containing the added item.
+  //     * `index` {Number} indicating the index of the added item in its pane.
+  //
+  // Returns a {Disposable} on which `.dispose()` can be called to unsubscribe.
+  onDidAddPaneItem (callback) {
+    return this.paneContainer.onDidAddPaneItem(callback)
+  }
+
+  // Extended: Invoke the given callback when a pane item is about to be
+  // destroyed, before the user is prompted to save it.
+  //
+  // * `callback` {Function} to be called before pane items are destroyed.
+  //   * `event` {Object} with the following keys:
+  //     * `item` The item to be destroyed.
+  //     * `pane` {Pane} containing the item to be destroyed.
+  //     * `index` {Number} indicating the index of the item to be destroyed in
+  //       its pane.
+  //
+  // Returns a {Disposable} on which `.dispose` can be called to unsubscribe.
+  onWillDestroyPaneItem (callback) {
+    return this.paneContainer.onWillDestroyPaneItem(callback)
+  }
+
+  // Extended: Invoke the given callback when a pane item is destroyed.
+  //
+  // * `callback` {Function} to be called when pane items are destroyed.
+  //   * `event` {Object} with the following keys:
+  //     * `item` The destroyed item.
+  //     * `pane` {Pane} containing the destroyed item.
+  //     * `index` {Number} indicating the index of the destroyed item in its
+  //       pane.
+  //
+  // Returns a {Disposable} on which `.dispose` can be called to unsubscribe.
+  onDidDestroyPaneItem (callback) {
+    return this.paneContainer.onDidDestroyPaneItem(callback)
+  }
+
+  /*
+  Section: Pane Items
+  */
+
+  // Essential: Get all pane items in the dock.
+  //
+  // Returns an {Array} of items.
+  getPaneItems () {
+    return this.paneContainer.getPaneItems()
+  }
+
+  // Essential: Get the active {Pane}'s active item.
+  //
+  // Returns an pane item {Object}.
+  getActivePaneItem () {
+    return this.paneContainer.getActivePaneItem()
+  }
+
+  // Essential: Get all text editors in the dock.
+  //
+  // Returns an {Array} of {TextEditor}s.
+  getTextEditors () {
+    return this.paneContainer.getTextEditors()
+  }
+
+  // Essential: Get the active item if it is an {TextEditor}.
+  //
+  // Returns an {TextEditor} or `undefined` if the current active item is not an
+  // {TextEditor}.
+  getActiveTextEditor () {
+    const activeItem = this.getActivePaneItem()
+    if (activeItem instanceof TextEditor) { return activeItem }
+  }
+
+  // Save all pane items.
+  saveAll () {
+    this.paneContainer.saveAll()
+  }
+
+  confirmClose (options) {
+    return this.paneContainer.confirmClose(options)
+  }
+
+  /*
+  Section: Panes
+  */
+
+  // Extended: Get all panes in the dock.
+  //
+  // Returns an {Array} of {Pane}s.
   getPanes () {
     return this.paneContainer.getPanes()
   }
 
-  observePanes (fn) {
-    return this.paneContainer.observePanes(fn)
-  }
-
-  onDidAddPane (fn) {
-    return this.paneContainer.onDidAddPane(fn)
-  }
-
-  onWillDestroyPane (fn) {
-    return this.paneContainer.onWillDestroyPane(fn)
-  }
-
-  onDidDestroyPane (fn) {
-    return this.paneContainer.onDidDestroyPane(fn)
+  // Extended: Get the active {Pane}.
+  //
+  // Returns a {Pane}.
+  getActivePane () {
+    return this.paneContainer.getActivePane()
   }
 
   paneForURI (uri) {
@@ -364,49 +590,12 @@ module.exports = class Dock {
     return this.paneContainer.paneForItem(item)
   }
 
-  getActivePane () {
-    return this.paneContainer.getActivePane()
-  }
-
-  getPaneItems () {
-    return this.paneContainer.getPaneItems()
-  }
-
-  getActivePaneItem () {
-    return this.paneContainer.getActivePaneItem()
-  }
-
-  getTextEditors () {
-    return this.paneContainer.getTextEditors()
-  }
-
-  getActiveTextEditor () {
-    const activeItem = this.getActivePaneItem()
-    if (activeItem instanceof TextEditor) { return activeItem }
-  }
-
-  observePaneItems (fn) {
-    return this.paneContainer.observePaneItems(fn)
-  }
-
-  onDidAddPaneItem (fn) {
-    return this.paneContainer.onDidAddPaneItem(fn)
-  }
-
-  onWillDestroyPaneItem (fn) {
-    return this.paneContainer.onWillDestroyPaneItem(fn)
-  }
-
-  onDidDestroyPaneItem (fn) {
-    return this.paneContainer.onDidDestroyPaneItem(fn)
-  }
-
-  saveAll () {
-    this.paneContainer.saveAll()
-  }
-
-  confirmClose (options) {
-    return this.paneContainer.confirmClose(options)
+  // Destroy (close) the active pane.
+  destroyActivePane () {
+    const activePane = this.getActivePane()
+    if (activePane != null) {
+      activePane.destroy()
+    }
   }
 }
 
diff --git a/src/workspace-center.js b/src/workspace-center.js
index c2c875b74..4979f4a6f 100644
--- a/src/workspace-center.js
+++ b/src/workspace-center.js
@@ -14,7 +14,7 @@ module.exports = class WorkspaceCenter {
   */
 
   // Essential: Invoke the given callback with all current and future text
-  // editors in the workspace.
+  // editors in the workspace center.
   //
   // * `callback` {Function} to be called with current and future text editors.
   //   * `editor` An {TextEditor} that is present in {::getTextEditors} at the time
@@ -27,7 +27,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Essential: Invoke the given callback with all current and future panes items
-  // in the workspace.
+  // in the workspace center.
   //
   // * `callback` {Function} to be called with current and future pane items.
   //   * `item` An item that is present in {::getPaneItems} at the time of
@@ -70,7 +70,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Essential: Invoke the given callback with the current active pane item and
-  // with all future active pane items in the workspace.
+  // with all future active pane items in the workspace center.
   //
   // * `callback` {Function} to be called when the active pane item changes.
   //   * `item` The current active pane item.
@@ -80,7 +80,8 @@ module.exports = class WorkspaceCenter {
     return this.paneContainer.observeActivePaneItem(callback)
   }
 
-  // Extended: Invoke the given callback when a pane is added to the workspace.
+  // Extended: Invoke the given callback when a pane is added to the workspace
+  // center.
   //
   // * `callback` {Function} to be called panes are added.
   //   * `event` {Object} with the following keys:
@@ -92,7 +93,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Extended: Invoke the given callback before a pane is destroyed in the
-  // workspace.
+  // workspace center.
   //
   // * `callback` {Function} to be called before panes are destroyed.
   //   * `event` {Object} with the following keys:
@@ -104,7 +105,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Extended: Invoke the given callback when a pane is destroyed in the
-  // workspace.
+  // workspace center.
   //
   // * `callback` {Function} to be called panes are destroyed.
   //   * `event` {Object} with the following keys:
@@ -116,7 +117,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Extended: Invoke the given callback with all current and future panes in the
-  // workspace.
+  // workspace center.
   //
   // * `callback` {Function} to be called with current and future panes.
   //   * `pane` A {Pane} that is present in {::getPanes} at the time of
@@ -150,7 +151,7 @@ module.exports = class WorkspaceCenter {
   }
 
   // Extended: Invoke the given callback when a pane item is added to the
-  // workspace.
+  // workspace center.
   //
   // * `callback` {Function} to be called when pane items are added.
   //   * `event` {Object} with the following keys:
@@ -196,7 +197,7 @@ module.exports = class WorkspaceCenter {
   Section: Pane Items
   */
 
-  // Essential: Get all pane items in the workspace.
+  // Essential: Get all pane items in the workspace center.
   //
   // Returns an {Array} of items.
   getPaneItems () {
@@ -210,7 +211,7 @@ module.exports = class WorkspaceCenter {
     return this.paneContainer.getActivePaneItem()
   }
 
-  // Essential: Get all text editors in the workspace.
+  // Essential: Get all text editors in the workspace center.
   //
   // Returns an {Array} of {TextEditor}s.
   getTextEditors () {
@@ -239,7 +240,7 @@ module.exports = class WorkspaceCenter {
   Section: Panes
   */
 
-  // Extended: Get all panes in the workspace.
+  // Extended: Get all panes in the workspace center.
   //
   // Returns an {Array} of {Pane}s.
   getPanes () {