Parallax*Fragment; support multiple parallax-layouts

reyadrahman · Jun 1, 2017 · 45565d1 · 45565d1
1 parent 98a2068
commit 45565d1
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Showing 2 changed files with 31 additions and 16 deletions.
diff --git a/...rc/main/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxFragment.java b/...rc/main/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxFragment.java
@@ -7,38 +7,45 @@
 import android.view.View;
 import android.view.ViewGroup;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.LinkedList;
+import java.util.List;
 import java.util.Queue;
 
 public class ParallaxFragment extends Fragment implements Parallaxable {
-    @Nullable
-    private Parallaxable parallaxLayout;
+
+    private List<Parallaxable> parallaxableChildren = Collections.emptyList();
 
     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
-        parallaxLayout = findParallaxLayout(view);
+        parallaxableChildren = findParallaxLayouts(view);
     }
 
-    public Parallaxable findParallaxLayout(View root) {
+    public List<Parallaxable> findParallaxLayouts(View root) {
+        List<Parallaxable> parallaxableChildren = new ArrayList<>();
         Queue<View> queue = new LinkedList<>();
         queue.add(root);
         while (!queue.isEmpty()) {
             View child = queue.remove();
             if (child instanceof Parallaxable) {
-                return (Parallaxable) child;
+                parallaxableChildren.add((Parallaxable) child);
             } else if (child instanceof ViewGroup) {
                 ViewGroup viewGroup = (ViewGroup) child;
                 for (int i = viewGroup.getChildCount() - 1; i >= 0; i--) {
                     queue.add(viewGroup.getChildAt(i));
                 }
             }
         }
-        return null;
+        return parallaxableChildren;
     }
 
     @Override
     public void setOffset(@FloatRange(from = -1.0, to = 1.0) float offset) {
-        if (parallaxLayout != null)
-            parallaxLayout.setOffset(offset);
+        if (!parallaxableChildren.isEmpty()) {
+            for (Parallaxable parallaxable : parallaxableChildren) {
+                parallaxable.setOffset(offset);
+            }
+        }
     }
 }
diff --git a/...in/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxSlideFragment.java b/...in/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxSlideFragment.java
@@ -2,44 +2,52 @@
 
 import android.os.Bundle;
 import android.support.annotation.FloatRange;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.view.View;
 import android.view.ViewGroup;
 
 import com.heinrichreimersoftware.materialintro.app.SlideFragment;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.LinkedList;
+import java.util.List;
 import java.util.Queue;
 
 public class ParallaxSlideFragment extends SlideFragment implements Parallaxable {
-    @Nullable
-    private Parallaxable parallaxLayout;
+
+    private List<Parallaxable> parallaxableChildren = Collections.emptyList();
 
     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
-        parallaxLayout = findParallaxLayout(view);
+        parallaxableChildren = findParallaxLayouts(view);
     }
 
-    public Parallaxable findParallaxLayout(View root) {
+    public List<Parallaxable> findParallaxLayouts(View root) {
+        List<Parallaxable> parallaxableChildren = new ArrayList<>();
         Queue<View> queue = new LinkedList<>();
         queue.add(root);
         while (!queue.isEmpty()) {
             View child = queue.remove();
             if (child instanceof Parallaxable) {
-                return (Parallaxable) child;
+                parallaxableChildren.add((Parallaxable) child);
             } else if (child instanceof ViewGroup) {
                 ViewGroup viewGroup = (ViewGroup) child;
                 for (int i = viewGroup.getChildCount() - 1; i >= 0; i--) {
                     queue.add(viewGroup.getChildAt(i));
                 }
             }
         }
-        return null;
+        return parallaxableChildren;
     }
 
     @Override
     public void setOffset(@FloatRange(from = -1.0, to = 1.0) float offset) {
-        if (parallaxLayout != null)
-            parallaxLayout.setOffset(offset);
+        if (!parallaxableChildren.isEmpty()) {
+            for (Parallaxable parallaxable : parallaxableChildren) {
+                parallaxable.setOffset(offset);
+            }
+        }
     }
 }