From 8286a76cdf580f4adc1e536cabd3cb3ce3427f15 Mon Sep 17 00:00:00 2001
From: Martin Fietz <Martin.Fietz@gmail.com>
Date: Sat, 7 Nov 2015 01:25:15 +0100
Subject: [PATCH] Fancy drag/swipe effect

---
 .../adapter/AllEpisodesRecycleAdapter.java    | 38 +++++++++++++++++-
 .../adapter/QueueRecyclerAdapter.java         | 39 ++++++++++++++++++-
 .../fragment/NewEpisodesFragment.java         | 27 +++++++++++++
 .../antennapod/fragment/QueueFragment.java    | 26 +++++++++++++
 4 files changed, 128 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/de/danoeh/antennapod/adapter/AllEpisodesRecycleAdapter.java b/app/src/main/java/de/danoeh/antennapod/adapter/AllEpisodesRecycleAdapter.java
index 1d04baf7a..b35ff0aa9 100644
--- a/app/src/main/java/de/danoeh/antennapod/adapter/AllEpisodesRecycleAdapter.java
+++ b/app/src/main/java/de/danoeh/antennapod/adapter/AllEpisodesRecycleAdapter.java
@@ -5,6 +5,7 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.support.v7.widget.PopupMenu;
 import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.text.format.DateUtils;
 import android.util.Log;
 import android.view.ContextMenu;
@@ -24,6 +25,7 @@ import com.bumptech.glide.load.resource.drawable.GlideDrawable;
 import com.bumptech.glide.request.animation.GlideAnimation;
 import com.bumptech.glide.request.target.GlideDrawableImageViewTarget;
 import com.joanzapata.iconify.Iconify;
+import com.nineoldandroids.view.ViewHelper;
 
 import java.lang.ref.WeakReference;
 
@@ -250,7 +252,9 @@ public class AllEpisodesRecycleAdapter extends RecyclerView.Adapter<AllEpisodesR
     };
 
     public class Holder extends RecyclerView.ViewHolder
-        implements View.OnClickListener, View.OnCreateContextMenuListener {
+            implements View.OnClickListener,
+                       View.OnCreateContextMenuListener,
+                       ItemTouchHelperViewHolder {
         TextView placeholder;
         TextView title;
         TextView pubDate;
@@ -278,6 +282,16 @@ public class AllEpisodesRecycleAdapter extends RecyclerView.Adapter<AllEpisodesR
             }
         }
 
+        @Override
+        public void onItemSelected() {
+            ViewHelper.setAlpha(itemView, 0.5f);
+        }
+
+        @Override
+        public void onItemClear() {
+            ViewHelper.setAlpha(itemView, 1.0f);
+        }
+
         public FeedItem getFeedItem() { return item; }
 
         @Override
@@ -317,4 +331,26 @@ public class AllEpisodesRecycleAdapter extends RecyclerView.Adapter<AllEpisodesR
         boolean isInQueue(FeedItem item);
 
     }
+
+    /**
+     * Notifies a View Holder of relevant callbacks from
+     * {@link ItemTouchHelper.Callback}.
+     */
+    public interface ItemTouchHelperViewHolder {
+
+        /**
+         * Called when the {@link ItemTouchHelper} first registers an
+         * item as being moved or swiped.
+         * Implementations should update the item view to indicate
+         * it's active state.
+         */
+        void onItemSelected();
+
+
+        /**
+         * Called when the {@link ItemTouchHelper} has completed the
+         * move or swipe, and the active item state should be cleared.
+         */
+        void onItemClear();
+    }
 }
diff --git a/app/src/main/java/de/danoeh/antennapod/adapter/QueueRecyclerAdapter.java b/app/src/main/java/de/danoeh/antennapod/adapter/QueueRecyclerAdapter.java
index 3402d39f1..062f883bc 100644
--- a/app/src/main/java/de/danoeh/antennapod/adapter/QueueRecyclerAdapter.java
+++ b/app/src/main/java/de/danoeh/antennapod/adapter/QueueRecyclerAdapter.java
@@ -26,6 +26,7 @@ import com.bumptech.glide.load.resource.drawable.GlideDrawable;
 import com.bumptech.glide.request.animation.GlideAnimation;
 import com.bumptech.glide.request.target.GlideDrawableImageViewTarget;
 import com.joanzapata.iconify.Iconify;
+import com.nineoldandroids.view.ViewHelper;
 
 import java.lang.ref.WeakReference;
 
@@ -101,7 +102,9 @@ public class QueueRecyclerAdapter extends RecyclerView.Adapter<QueueRecyclerAdap
     }
 
     public class ViewHolder extends RecyclerView.ViewHolder
-            implements View.OnClickListener, View.OnCreateContextMenuListener {
+            implements View.OnClickListener,
+                       View.OnCreateContextMenuListener,
+                       ItemTouchHelperViewHolder {
 
         private final ImageView dragHandle;
         private final TextView placeholder;
@@ -170,6 +173,16 @@ public class QueueRecyclerAdapter extends RecyclerView.Adapter<QueueRecyclerAdap
                     itemAccess.getQueueIds());
         }
 
+        @Override
+        public void onItemSelected() {
+            ViewHelper.setAlpha(itemView, 0.5f);
+        }
+
+        @Override
+        public void onItemClear() {
+            ViewHelper.setAlpha(itemView, 1.0f);
+        }
+
         public void bind(FeedItem item) {
             this.item = item;
             if(locked) {
@@ -248,6 +261,8 @@ public class QueueRecyclerAdapter extends RecyclerView.Adapter<QueueRecyclerAdap
                 .dontAnimate()
                 .into(new CoverTarget(item.getFeed().getImageUri(), placeholder, cover));
         }
+
+
     }
     
 
@@ -306,4 +321,26 @@ public class QueueRecyclerAdapter extends RecyclerView.Adapter<QueueRecyclerAdap
         int getItemDownloadProgressPercent(FeedItem item);
         LongList getQueueIds();
     }
+
+    /**
+     * Notifies a View Holder of relevant callbacks from
+     * {@link ItemTouchHelper.Callback}.
+     */
+    public interface ItemTouchHelperViewHolder {
+
+        /**
+         * Called when the {@link ItemTouchHelper} first registers an
+         * item as being moved or swiped.
+         * Implementations should update the item view to indicate
+         * it's active state.
+         */
+        void onItemSelected();
+
+
+        /**
+         * Called when the {@link ItemTouchHelper} has completed the
+         * move or swipe, and the active item state should be cleared.
+         */
+        void onItemClear();
+    }
 }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/NewEpisodesFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/NewEpisodesFragment.java
index 00ed99444..d684c064c 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/NewEpisodesFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/NewEpisodesFragment.java
@@ -14,6 +14,7 @@ import java.util.List;
 
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.adapter.AllEpisodesRecycleAdapter;
+import de.danoeh.antennapod.adapter.QueueRecyclerAdapter;
 import de.danoeh.antennapod.core.event.QueueEvent;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedMedia;
@@ -104,6 +105,32 @@ public class NewEpisodesFragment extends AllEpisodesFragment {
                 snackbar.show();
                 h.postDelayed(r, (int)Math.ceil(snackbar.getDuration() * 1.05f));
             }
+
+            @Override
+            public void onSelectedChanged(RecyclerView.ViewHolder viewHolder,
+                                          int actionState) {
+                // We only want the active item
+                if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
+                    if (viewHolder instanceof AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder) {
+                        AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder itemViewHolder =
+                                (AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder) viewHolder;
+                        itemViewHolder.onItemSelected();
+                    }
+                }
+
+                super.onSelectedChanged(viewHolder, actionState);
+            }
+            @Override
+            public void clearView(RecyclerView recyclerView,
+                                  RecyclerView.ViewHolder viewHolder) {
+                super.clearView(recyclerView, viewHolder);
+
+                if (viewHolder instanceof AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder) {
+                    AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder itemViewHolder =
+                            (AllEpisodesRecycleAdapter.ItemTouchHelperViewHolder) viewHolder;
+                    itemViewHolder.onItemClear();
+                }
+            }
         };
 
         ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
index ecd2c77a2..709d7038a 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
@@ -402,6 +402,32 @@ public class QueueFragment extends Fragment {
                 public boolean isItemViewSwipeEnabled() {
                     return false == UserPreferences.isQueueLocked();
                 }
+
+                @Override
+                public void onSelectedChanged(RecyclerView.ViewHolder viewHolder,
+                                              int actionState) {
+                    // We only want the active item
+                    if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
+                        if (viewHolder instanceof QueueRecyclerAdapter.ItemTouchHelperViewHolder) {
+                            QueueRecyclerAdapter.ItemTouchHelperViewHolder itemViewHolder =
+                                    (QueueRecyclerAdapter.ItemTouchHelperViewHolder) viewHolder;
+                            itemViewHolder.onItemSelected();
+                        }
+                    }
+
+                    super.onSelectedChanged(viewHolder, actionState);
+                }
+                @Override
+                public void clearView(RecyclerView recyclerView,
+                                      RecyclerView.ViewHolder viewHolder) {
+                    super.clearView(recyclerView, viewHolder);
+
+                    if (viewHolder instanceof QueueRecyclerAdapter.ItemTouchHelperViewHolder) {
+                        QueueRecyclerAdapter.ItemTouchHelperViewHolder itemViewHolder =
+                                (QueueRecyclerAdapter.ItemTouchHelperViewHolder) viewHolder;
+                        itemViewHolder.onItemClear();
+                    }
+                }
             }
         );
         itemTouchHelper.attachToRecyclerView(recyclerView);