Added feature to disable parallax in specific views (#10)

Author: Sloy

README.md

@@ -149,6 +149,20 @@ If you need a different parallax order you can change this behavior by overridin
 </com.schibsted.spain.parallaxlayerlayout.ParallaxLayerLayout>
 ```
 
+## Static layer
+
+You can disable the parallax effect in any of the views to stop them from moving with the attribute **layout_parallaxEnabled**:
+
+```xml
+<View
+    android:id="@+id/layer_static"
+    android:layout_width="180dp"
+    android:layout_height="180dp"
+    android:background="@color/colorPrimaryDark"
+    app:layout_parallaxEnabled="false" />
+```
+
+
 # Contribute
 For bugs, requests, questions and discussions please use [Github Issues](https://github.com/SchibstedSpain/parallax-layer-layout/issues).	
 

library/src/main/java/com/schibsted/spain/parallaxlayerlayout/ParallaxLayerLayout.java

@@ -121,6 +121,9 @@ public void setTranslationUpdater(TranslationUpdater translationUpdater) {
   @Size(2)
   private float[] calculateFinalTranslationPx(View child, @Size(2) float[] translations) {
     LayoutParams lp = (LayoutParams) child.getLayoutParams();
+    if (!lp.enabled) {
+      return new float[] { 0f, 0f };
+    }
     int xSign = translations[0] > 0 ? 1 : -1;
     int ySign = translations[1] > 0 ? 1 : -1;
 
@@ -168,6 +171,7 @@ public static class LayoutParams extends FrameLayout.LayoutParams {
     private float offsetPx;
     private int customIndex = -1;
     private float incrementMultiplier = 1.0f;
+    private boolean enabled = true;
 
     public LayoutParams(Context c, AttributeSet attrs) {
       super(c, attrs);
@@ -178,6 +182,8 @@ public LayoutParams(Context c, AttributeSet attrs) {
             a.getInt(R.styleable.ParallaxLayerLayout_LayoutParams_layout_parallaxZIndex, -1);
         incrementMultiplier = a.getFloat(
             R.styleable.ParallaxLayerLayout_LayoutParams_layout_parallaxIncrementMultiplier, 1.0f);
+        enabled = a.getBoolean(
+            R.styleable.ParallaxLayerLayout_LayoutParams_layout_parallaxEnabled, true);
       } finally {
         a.recycle();
       }

library/src/main/res/values/attrs.xml

@@ -16,5 +16,7 @@
           format="integer"/>
     <attr name="layout_parallaxIncrementMultiplier"
           format="float"/>
+    <attr name="layout_parallaxEnabled"
+          format="boolean"/>
   </declare-styleable>
 </resources>