Add core:move-to-top and core:move-to-bottom support to tree view

spec/extensions/tree-view-spec.coffee

@@ -314,7 +314,7 @@ describe "TreeView", ->
     afterEach ->
       expect(treeView.find('.selected').length).toBeLessThan 2
 
-    describe "move-down", ->
+    describe "core:move-down", ->
       describe "when a collapsed directory is selected", ->
         it "skips to the next directory", ->
           treeView.root.find('.directory:eq(0)').click()
@@ -408,6 +408,33 @@ describe "TreeView", ->
           treeView.trigger 'core:move-up'
           expect(treeView.root).toHaveClass 'selected'
 
+    describe "core:move-to-top", ->
+      it "scrolls to the top", ->
+        treeView.height(100)
+        treeView.attachToDom()
+        $(element).view().expand() for element in treeView.find('.directory')
+        expect(treeView.prop('scrollHeight')).toBeGreaterThan treeView.outerHeight()
+
+        expect(treeView.scrollTop()).toBe 0
+
+        entryCount = treeView.find(".entry").length
+        _.times entryCount, -> treeView.moveDown()
+        expect(treeView.scrollTop()).toBeGreaterThan 0
+
+        treeView.trigger 'core:move-to-top'
+        expect(treeView.scrollTop()).toBe 0
+
+    describe "core:move-to-bottom", ->
+      it "scrolls to the bottom", ->
+        treeView.height(100)
+        treeView.attachToDom()
+        $(element).view().expand() for element in treeView.find('.directory')
+        expect(treeView.prop('scrollHeight')).toBeGreaterThan treeView.outerHeight()
+
+        expect(treeView.scrollTop()).toBe 0
+        treeView.trigger 'core:move-to-bottom'
+        expect(treeView.scrollBottom()).toBe treeView.prop('scrollHeight')
+
     describe "movement outside of viewable region", ->
       it "scrolls the tree view to the selected item", ->
         treeView.height(100)

src/extensions/tree-view/tree-view.coffee

@@ -48,6 +48,8 @@ class TreeView extends View
     @on 'click', '.entry', (e) => @entryClicked(e)
     @on 'core:move-up', => @moveUp()
     @on 'core:move-down', => @moveDown()
+    @on 'core:move-to-top', => @scrollToTop()
+    @on 'core:move-to-bottom', => @scrollToBottom()
     @on 'tree-view:expand-directory', => @expandDirectory()
     @on 'tree-view:collapse-directory', => @collapseDirectory()
     @on 'tree-view:open-selected-entry', => @openSelectedEntry(true)

src/stdlib/jquery-extensions.coffee

@@ -6,6 +6,12 @@ $.fn.scrollBottom = (newValue) ->
   else
     @scrollTop() + @height()
 
+$.fn.scrollToTop = ->
+  @scrollTop(0)
+
+$.fn.scrollToBottom = ->
+  @scrollTop(@prop('scrollHeight'))
+
 $.fn.scrollRight = (newValue) ->
   if newValue?
     @scrollLeft(newValue - @width())