replaced top and bottom shadow by background shadow 9patch

library/src/main/java/com/jmedeisis/draglinearlayout/DragLinearLayout.java

@@ -176,14 +176,10 @@ public void stopDetecting() {
     private int activePointerId = INVALID_POINTER_ID;
 
     /**
-     * The shadow to be drawn above the {@link #draggedItem}.
+     * The shadow to be drawn behind the {@link #draggedItem}.
      */
-    private final Drawable dragTopShadowDrawable;
-    /**
-     * The shadow to be drawn below the {@link #draggedItem}.
-     */
-    private final Drawable dragBottomShadowDrawable;
-    private final int dragShadowHeight;
+    private final Drawable dragShadowDrawable;
+    private final int dragShadowMargin;
 
     /**
      * See {@link #setContainerScrollView(android.widget.ScrollView)}.
@@ -209,9 +205,8 @@ public DragLinearLayout(Context context, AttributeSet attrs) {
         slop = vc.getScaledTouchSlop();
 
         final Resources resources = getResources();
-        dragTopShadowDrawable = ContextCompat.getDrawable(context, R.drawable.ab_solid_shadow_holo_flipped);
-        dragBottomShadowDrawable = ContextCompat.getDrawable(context, R.drawable.ab_solid_shadow_holo);
-        dragShadowHeight = resources.getDimensionPixelSize(R.dimen.downwards_drop_shadow_height);
+        dragShadowDrawable = ContextCompat.getDrawable(context, R.drawable.shadow_light);
+        dragShadowMargin = resources.getDimensionPixelSize(R.dimen.drop_shadow_margin);
 
         TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.DragLinearLayout, 0, 0);
         try {
@@ -394,8 +389,7 @@ public void onAnimationUpdate(ValueAnimator animation) {
                 draggedItem.setTotalOffset(((Float) animation.getAnimatedValue()).intValue());
 
                 final int shadowAlpha = (int) ((1 - animation.getAnimatedFraction()) * 255);
-                if (null != dragTopShadowDrawable) dragTopShadowDrawable.setAlpha(shadowAlpha);
-                dragBottomShadowDrawable.setAlpha(shadowAlpha);
+                if (null != dragShadowDrawable) dragShadowDrawable.setAlpha(shadowAlpha);
                 invalidate();
             }
         });
@@ -414,8 +408,7 @@ public void onAnimationEnd(Animator animation) {
                 draggedItem.settleAnimation = null;
                 draggedItem.stopDetecting();
 
-                if (null != dragTopShadowDrawable) dragTopShadowDrawable.setAlpha(255);
-                dragBottomShadowDrawable.setAlpha(255);
+                if (null != dragShadowDrawable) dragShadowDrawable.setAlpha(255);
 
                 // restore layout transition
                 if (layoutTransition != null && getLayoutTransition() == null) {
@@ -586,21 +579,16 @@ protected void dispatchDraw(@NonNull Canvas canvas) {
         if (draggedItem.detecting && (draggedItem.dragging || draggedItem.settling())) {
             canvas.save();
             canvas.translate(0, draggedItem.totalDragOffset);
-            draggedItem.viewDrawable.draw(canvas);
 
             final int left = draggedItem.viewDrawable.getBounds().left;
             final int right = draggedItem.viewDrawable.getBounds().right;
             final int top = draggedItem.viewDrawable.getBounds().top;
             final int bottom = draggedItem.viewDrawable.getBounds().bottom;
+            dragShadowDrawable.setBounds(left - dragShadowMargin, top - dragShadowMargin, right + dragShadowMargin, bottom + dragShadowMargin);
+            dragShadowDrawable.setAlpha(75);
+            dragShadowDrawable.draw(canvas);
 
-            dragBottomShadowDrawable.setBounds(left, bottom, right, bottom + dragShadowHeight);
-            dragBottomShadowDrawable.draw(canvas);
-
-            if (null != dragTopShadowDrawable) {
-                dragTopShadowDrawable.setBounds(left, top - dragShadowHeight, right, top);
-                dragTopShadowDrawable.draw(canvas);
-            }
-
+            draggedItem.viewDrawable.draw(canvas);
             canvas.restore();
         }
     }

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

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <dimen name="downwards_drop_shadow_height">16dp</dimen>
+    <dimen name="drop_shadow_margin">12dp</dimen>
 </resources>

sample/src/main/res/layout/activity_demo.xml

@@ -17,6 +17,7 @@
         android:text="@string/list_item_1"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:layout_margin="8dp"
         style="@style/SpaciousListItem" />
 
     <TextView

sample/src/main/res/values/strings.xml

@@ -3,7 +3,7 @@
 
     <string name="app_name">DragLinearLayout Demo</string>
     <string name="list_title">Simple linear layout</string>
-    <string name="list_item_1">Drag me! Drop me!</string>
+    <string name="list_item_1">Drag me! Drop me! I have a margin.</string>
     <string name="list_item_2">Swap with me! Swap with me!</string>
     <string name="list_item_3">I\'m quite sensitive\nabout my height.</string>
     <string name="list_item_4">I heard that one of us is a Button!</string>