Merge pull request janheinrichmerker#211 from meierjan/feature/multi-…

…parallaxable-layouts Parallax*Fragment; support multiple parallax-layouts
reyadrahman · Jul 10, 2017 · f227a0b · f227a0b
2 parents ede071e + 4c4b266
commit f227a0b
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Showing 3 changed files with 67 additions and 49 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
@@ -5,40 +5,23 @@
 import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 import android.view.View;
-import android.view.ViewGroup;
 
-import java.util.LinkedList;
-import java.util.Queue;
+import com.heinrichreimersoftware.materialintro.view.parallax.util.ParallaxUtil;
+
+import java.util.ArrayList;
+import java.util.List;
 
 public class ParallaxFragment extends Fragment implements Parallaxable {
-    @Nullable
-    private Parallaxable parallaxLayout;
+
+    private final List<Parallaxable> parallaxableChildren = new ArrayList<>();
 
     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
-        parallaxLayout = findParallaxLayout(view);
-    }
-
-    public Parallaxable findParallaxLayout(View root) {
-        Queue<View> queue = new LinkedList<>();
-        queue.add(root);
-        while (!queue.isEmpty()) {
-            View child = queue.remove();
-            if (child instanceof Parallaxable) {
-                return (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;
+        parallaxableChildren.addAll(ParallaxUtil.findParallaxableChildren(view));
     }
 
     @Override
     public void setOffset(@FloatRange(from = -1.0, to = 1.0) float offset) {
-        if (parallaxLayout != null)
-            parallaxLayout.setOffset(offset);
+        ParallaxUtil.setOffsetToParallaxableList(parallaxableChildren, offset);
     }
 }
diff --git a/...in/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxSlideFragment.java b/...in/java/com/heinrichreimersoftware/materialintro/view/parallax/ParallaxSlideFragment.java
@@ -4,42 +4,26 @@
 import android.support.annotation.FloatRange;
 import android.support.annotation.Nullable;
 import android.view.View;
-import android.view.ViewGroup;
 
 import com.heinrichreimersoftware.materialintro.app.SlideFragment;
+import com.heinrichreimersoftware.materialintro.view.parallax.util.ParallaxUtil;
+
+import java.util.ArrayList;
+import java.util.List;
 
-import java.util.LinkedList;
-import java.util.Queue;
 
 public class ParallaxSlideFragment extends SlideFragment implements Parallaxable {
-    @Nullable
-    private Parallaxable parallaxLayout;
+
+    private final List<Parallaxable> parallaxableChildren = new ArrayList<>();
 
     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
-        parallaxLayout = findParallaxLayout(view);
+        parallaxableChildren.addAll(ParallaxUtil.findParallaxableChildren(view));
     }
 
-    public Parallaxable findParallaxLayout(View root) {
-        Queue<View> queue = new LinkedList<>();
-        queue.add(root);
-        while (!queue.isEmpty()) {
-            View child = queue.remove();
-            if (child instanceof Parallaxable) {
-                return (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;
-    }
 
     @Override
     public void setOffset(@FloatRange(from = -1.0, to = 1.0) float offset) {
-        if (parallaxLayout != null)
-            parallaxLayout.setOffset(offset);
+        ParallaxUtil.setOffsetToParallaxableList(parallaxableChildren, offset);
     }
 }
diff --git a/...c/main/java/com/heinrichreimersoftware/materialintro/view/parallax/util/ParallaxUtil.java b/...c/main/java/com/heinrichreimersoftware/materialintro/view/parallax/util/ParallaxUtil.java
@@ -0,0 +1,51 @@
+package com.heinrichreimersoftware.materialintro.view.parallax.util;
+
+import android.support.annotation.FloatRange;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.heinrichreimersoftware.materialintro.view.parallax.Parallaxable;
+
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+
+public class ParallaxUtil {
+    private ParallaxUtil() {}
+
+    public static List<Parallaxable> findParallaxableChildren(View root) {
+        List<Parallaxable> parallaxableChildrenFound = new LinkedList<>();
+        Queue<View> queue = new LinkedList<>();
+        queue.add(root);
+        while (!queue.isEmpty()) {
+            View child = queue.remove();
+            if (child instanceof Parallaxable) {
+                parallaxableChildrenFound.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 parallaxableChildrenFound;
+    }
+
+    /**
+     * Set the provided offset to a list of parallaxable items.
+     *
+     * @param parallaxableChildren The list of parallaxable items to set the offset to.
+     * @param offset The offset to assign.
+     */
+    public static void setOffsetToParallaxableList(
+            final List<Parallaxable> parallaxableChildren,
+            @FloatRange(from = -1.0, to = 1.0) float offset
+    ) {
+        if (!parallaxableChildren.isEmpty()) {
+            for (Parallaxable parallaxable : parallaxableChildren) {
+                parallaxable.setOffset(offset);
+            }
+        }
+    }
+
+}