Update readme

README.md

@@ -38,7 +38,7 @@ Get started by wrapping your layout in a BottomSheet. So if you currently have t
 
 You would have to update it to look like this:
 ```xml
-<com.flipboard.bottomsheet.BottomSheet
+<com.flipboard.bottomsheet.BottomSheetLayout
 	android:id="@+id/bottomsheet"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
@@ -61,12 +61,12 @@ You would have to update it to look like this:
 
 	</LinearLayout>
 
-</com.flipboard.bottomsheet.BottomSheet>
+</com.flipboard.bottomsheet.BottomSheetLayout>
 ```
 
 Back in your activity or fragment you would get a reference to the BottomSheet like any other view.
 ```java
-BottomSheet bottomSheet = (BottomSheet) findViewById(R.id.bottomsheet);
+BottomSheetLayout bottomSheet = (BottomSheetLayout) findViewById(R.id.bottomsheet);
 ```
 
 Now all you need to do is show a view in the bottomSheet:
@@ -88,7 +88,7 @@ bottomSheet.showWithSheetView(new IntentPickerSheetView(this, shareIntent, "Shar
 That's it for the simplest of use cases. Check out the API documentation below to find out how to customize BottomSheet to fit your use cases.
 
 ##API
-###BottomSheet
+###BottomSheetLayout
  ```java
 /**
  * Set the presented sheet to be in an expanded state.
@@ -212,7 +212,7 @@ public void setOnSheetStateChangeListener(OnSheetStateChangeListener onSheetStat
  *
  * @param bottomSheet The bottom sheet which contained the presented sheet.
  */
-void onDismissed(BottomSheet bottomSheet);
+void onDismissed(BottomSheetLayout bottomSheet);
 ```
 
 ###ViewTransformer
@@ -227,9 +227,25 @@ void onDismissed(BottomSheet bottomSheet);
  * @param parent The BottomSheet presenting the sheet view.
  * @param view The content view to transform.
  */
-void transformView(float translation, float maxTranslation, float peekedTranslation, BottomSheet parent, View view);
+void transformView(float translation, float maxTranslation, float peekedTranslation, BottomSheetLayout parent, View view);
+
+/**
+ * Called on when the translation of the sheet view changes allowing you to customize the amount of dimming which
+ * is applied to the content view.
+ *
+ * @param translation The current translation of the presented sheet view.
+ * @param maxTranslation The max translation of the presented sheet view.
+ * @param peekedTranslation The peeked state translation of the presented sheet view.
+ * @param parent The BottomSheet presenting the sheet view.
+ * @param view The content view to transform.
+ *
+ * @return The alpha to apply to the dim overlay.
+ */
+float getDimAlpha(float translation, float maxTranslation, float peekedTranslation, BottomSheetLayout parent, View view);
 ```
 
+`BaseViewTransformer` exists for you to extend if you would like the default dimming behaviour.
+
 ##Common Components
 These are located in the optional `bottomsheet-commons` dependency and implement common use cases for bottom sheet.