Initial framework to allow for dismissing apps in updates tab.

app/src/main/java/org/fdroid/fdroid/views/apps/AppListItemController.java

@@ -26,6 +26,7 @@ import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.ImageLoader;
@@ -160,6 +161,11 @@ public abstract class AppListItemController extends RecyclerView.ViewHolder {
         itemView.setOnClickListener(onAppClicked);
     }
 
+    @Nullable
+    protected final AppUpdateStatus getCurrentStatus() {
+        return currentStatus;
+    }
+
     public void bindModel(@NonNull App app) {
         currentApp = app;
 
@@ -187,6 +193,36 @@ public abstract class AppListItemController extends RecyclerView.ViewHolder {
         broadcastManager.registerReceiver(onStatusChanged, intentFilter);
     }
 
+    /** To be overridden if required */
+    public boolean canDismiss() {
+        return false;
+    }
+
+    /**
+     * If able, forwards the request onto {@link #onDismissApp(App)}.
+     * This mainly exists to keep the API consistent, in that the {@link App} is threaded through to the relevant
+     * method with a guarantee that it is not null, rather than every method having to check if it is null or not.
+     */
+    public final void onDismiss() {
+        if (currentApp != null && canDismiss()) {
+            CharSequence message = onDismissApp(currentApp);
+            if (message != null) {
+                Toast.makeText(activity, message, Toast.LENGTH_SHORT).show();
+            }
+        }
+    }
+
+    /**
+     * Override to respond to the user swiping an app to dismiss it from the list.
+     * @return Optionally return a description of what you did if it is not obvious to the user. It will be shown as
+     * a {@link android.widget.Toast} for a {@link android.widget.Toast#LENGTH_SHORT} time.
+     * @see #canDismiss() This must also be overriden and should return true.
+     */
+    @Nullable
+    protected CharSequence onDismissApp(@NonNull App app) {
+        return null;
+    }
+
     /**
      * Updates both the progress bar and the circular install button (which shows progress around the outside of
      * the circle). Also updates the app label to indicate that the app is being downloaded.

app/src/main/java/org/fdroid/fdroid/views/updates/UpdatesAdapter.java

@@ -341,4 +341,6 @@ public class UpdatesAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
         }
     };
 
+    public void onItemDismissed() {
+    }
 }

app/src/main/java/org/fdroid/fdroid/views/updates/UpdatesItemTouchCallback.java

@@ -0,0 +1,70 @@
+package org.fdroid.fdroid.views.updates;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+import org.fdroid.fdroid.views.apps.AppListItemController;
+import org.fdroid.fdroid.views.updates.items.AppStatusListItemController;
+import org.fdroid.fdroid.views.updates.items.KnownVulnAppListItemController;
+import org.fdroid.fdroid.views.updates.items.UpdateableAppListItemController;
+
+/**
+ * Certain views within the {@link UpdatesAdapter} can be swiped to dismiss. Depending on which item is swiped, there
+ * is a different behaviour, but all of it revolves around dismissing the item.
+ *
+ * <ul>
+ *   <li>
+ *     {@link KnownVulnAppListItemController}: Will be marked as "Ignored" and wont warn the user in the future.
+ *   </li>
+ *   <li>
+ *     {@link UpdateableAppListItemController}: Will get marked as "Ignore this update".
+ *   </li>
+ *   <li>
+ *     {@link AppStatusListItemController}:
+ *     <ul>
+ *         <li>If downloading or queued to download, cancel the download.</li>
+ *         <li>If downloaded waiting to install, forget that we downloaded it.</li>
+ *         <li>If installed ready to run, stop prompting the user to run the app.</li>
+ *     </ul>
+ *   <li>
+ * </ul>
+ */
+public class UpdatesItemTouchCallback extends ItemTouchHelper.Callback {
+
+    private final UpdatesAdapter adapter;
+
+    public UpdatesItemTouchCallback(UpdatesAdapter adapter) {
+        this.adapter = adapter;
+    }
+
+    @Override
+    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+        int swipeFlags = 0;
+        if (viewHolder instanceof AppListItemController) {
+            AppListItemController controller = (AppListItemController) viewHolder;
+            if (controller.canDismiss()) {
+                swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
+            }
+        }
+        return makeMovementFlags(0, swipeFlags);
+    }
+
+    @Override
+    public boolean onMove(
+            RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
+        return false;
+    }
+
+    @Override
+    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+        AppListItemController controller = (AppListItemController) viewHolder;
+        controller.onDismiss();
+        adapter.onItemDismissed();
+    }
+
+    @Override
+    public boolean isItemViewSwipeEnabled() {
+        return true;
+    }
+
+}

app/src/main/java/org/fdroid/fdroid/views/updates/UpdatesViewBinder.java

@@ -3,6 +3,7 @@ package org.fdroid.fdroid.views.updates;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
@@ -28,6 +29,9 @@ public class UpdatesViewBinder {
         list.setLayoutManager(new LinearLayoutManager(activity));
         list.setAdapter(adapter);
 
+        ItemTouchHelper touchHelper = new ItemTouchHelper(new UpdatesItemTouchCallback(adapter));
+        touchHelper.attachToRecyclerView(list);
+
         emptyState = (TextView) view.findViewById(R.id.empty_state);
         emptyImage = (ImageView) view.findViewById(R.id.image);
     }