Add more scroll related methods

atom-minimap · Dec 12, 2014 · 2e51742 · 2e51742
1 parent 481a39e
commit 2e51742
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diff --git a/lib/minimap.coffee b/lib/minimap.coffee
@@ -18,6 +18,10 @@ class Minimap
 
   getLineHeight: -> @charHeight + @interline
 
+  getMinimapScrollHeight: -> Math.max(0, @getHeight() - @textEditor.getHeight())
+
+  canScroll: -> @getMinimapScrollHeight() > 0
+
   subscribeToConfig: ->
     @subscriptions.add atom.config.observe 'minimap.charHeight', (@charHeight) =>
     @subscriptions.add atom.config.observe 'minimap.charWidth', (@charWidth) =>

diff --git a/spec/minimap-spec.coffee b/spec/minimap-spec.coffee
@@ -41,3 +41,18 @@ describe 'Minimap', ->
     editor.setScrollTop(1000)
 
     expect(minimap.getTextEditorScroll()).toEqual(500)
+
+  it 'measures the available minimap scroll', ->
+    editor.setText(largeSample)
+    largeLineCount = editor.getLineCount()
+
+    expect(minimap.getMinimapScrollHeight()).toEqual(largeLineCount * 5 - 50)
+    expect(minimap.canScroll()).toBeTruthy()
+
+  describe 'when there is no scrolling needed to display the whole minimap', ->
+    describe 'measuring the available minimap scroll', ->
+      it 'returns 0', ->
+        editor.setText(smallSample)
+
+        expect(minimap.getMinimapScrollHeight()).toEqual(0)
+        expect(minimap.canScroll()).toBeFalsy()