1 files changed, 190 insertions, 0 deletions
diff --git a/src/com/android/photos/MultiChoiceManager.java b/src/com/android/photos/MultiChoiceManager.java
new file mode 100644
index 000000000..e00c842fe
--- /dev/null
+++ b/src/com/android/photos/MultiChoiceManager.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.photos;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.util.SparseBooleanArray;
+import android.view.ActionMode;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.widget.AbsListView.MultiChoiceModeListener;
+import android.widget.ShareActionProvider;
+import android.widget.ShareActionProvider.OnShareTargetSelectedListener;
+
+import com.android.gallery3d.R;
+import com.android.gallery3d.data.MediaObject;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MultiChoiceManager implements MultiChoiceModeListener,
+    OnShareTargetSelectedListener, SelectionManager.SelectedUriSource {
+
+    public interface Delegate {
+        public SparseBooleanArray getSelectedItemPositions();
+        public int getSelectedItemCount();
+        public int getItemMediaType(Object item);
+        public int getItemSupportedOperations(Object item);
+        public ArrayList<Uri> getSubItemUrisForItem(Object item);
+        public Object getItemAtPosition(int position);
+        public Object getPathForItemAtPosition(int position);
+        public void deleteItemWithPath(Object itemPath);
+    }
+
+    private SelectionManager mSelectionManager;
+    private ShareActionProvider mShareActionProvider;
+    private ActionMode mActionMode;
+    private int numSubItemsCollected = 0;
+    private Context mContext;
+    private Delegate mDelegate;
+
+    private ArrayList<Uri> mSelectedUrisArray = new ArrayList<Uri>();
+
+    public MultiChoiceManager(Context context, Delegate delegate) {
+        mContext = context;
+        mDelegate = delegate;
+    }
+
+    public void setSelectionManager(SelectionManager selectionManager) {
+        mSelectionManager = selectionManager;
+    }
+
+    @Override
+    public ArrayList<Uri> getSelectedShareableUris() {
+        return mSelectedUrisArray;
+    }
+
+    private void updateSelectedTitle(ActionMode mode) {
+        int count = mDelegate.getSelectedItemCount();
+        mode.setTitle(mContext.getResources().getQuantityString(
+                R.plurals.number_of_items_selected, count, count));
+    }
+
+    @Override
+    public void onItemCheckedStateChanged(ActionMode mode, int position, long id,
+            boolean checked) {
+        updateSelectedTitle(mode);
+        Object item = mDelegate.getItemAtPosition(position);
+
+        ArrayList<Uri> subItems = mDelegate.getSubItemUrisForItem(item);
+        if (checked) {
+            mSelectedUrisArray.addAll(subItems);
+            numSubItemsCollected += subItems.size();
+        } else {
+            mSelectedUrisArray.removeAll(subItems);
+            numSubItemsCollected -= subItems.size();
+        }
+
+        mSelectionManager.onItemSelectedStateChanged(mShareActionProvider,
+                mDelegate.getItemMediaType(item),
+                mDelegate.getItemSupportedOperations(item),
+                checked);
+        updateActionItemVisibilities(mode.getMenu(),
+                mSelectionManager.getSupportedOperations());
+    }
+
+    private void updateActionItemVisibilities(Menu menu, int supportedOperations) {
+        MenuItem shareItem = menu.findItem(R.id.menu_share);
+        MenuItem deleteItem = menu.findItem(R.id.menu_delete);
+        shareItem.setVisible((supportedOperations & MediaObject.SUPPORT_SHARE) > 0);
+        deleteItem.setVisible((supportedOperations & MediaObject.SUPPORT_DELETE) > 0);
+    }
+
+    @Override
+    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+        mSelectionManager.setSelectedUriSource(this);
+        mActionMode = mode;
+        MenuInflater inflater = mode.getMenuInflater();
+        inflater.inflate(R.menu.gallery_multiselect, menu);
+        MenuItem menuItem = menu.findItem(R.id.menu_share);
+        mShareActionProvider = (ShareActionProvider) menuItem.getActionProvider();
+        mShareActionProvider.setOnShareTargetSelectedListener(this);
+        updateSelectedTitle(mode);
+        return true;
+    }
+
+    @Override
+    public void onDestroyActionMode(ActionMode mode) {
+        // onDestroyActionMode gets called when the share target was selected,
+        // but apparently before the ArrayList is serialized in the intent
+        // so we can't clear the old one here.
+        mSelectedUrisArray = new ArrayList<Uri>();
+        mSelectionManager.onClearSelection();
+        mSelectionManager.setSelectedUriSource(null);
+        mShareActionProvider = null;
+        mActionMode = null;
+    }
+
+    @Override
+    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+        updateSelectedTitle(mode);
+        return false;
+    }
+
+    @Override
+    public boolean onShareTargetSelected(ShareActionProvider provider, Intent intent) {
+        mActionMode.finish();
+        return false;
+    }
+
+    private static class BulkDeleteTask extends AsyncTask<Void, Void, Void> {
+        private Delegate mDelegate;
+        private List<Object> mPaths;
+
+        public BulkDeleteTask(Delegate delegate, List<Object> paths) {
+            mDelegate = delegate;
+            mPaths = paths;
+        }
+
+        @Override
+        protected Void doInBackground(Void... ignored) {
+            for (Object path : mPaths) {
+                mDelegate.deleteItemWithPath(path);
+            }
+            return null;
+        }
+    }
+
+    @Override
+    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_delete:
+                BulkDeleteTask deleteTask = new BulkDeleteTask(mDelegate,
+                        getPathsForSelectedItems());
+                deleteTask.execute();
+                mode.finish();
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    private List<Object> getPathsForSelectedItems() {
+        List<Object> paths = new ArrayList<Object>();
+        SparseBooleanArray selected = mDelegate.getSelectedItemPositions();
+        for (int i = 0; i < selected.size(); i++) {
+            if (selected.valueAt(i)) {
+                paths.add(mDelegate.getPathForItemAtPosition(i));
+            }
+        }
+        return paths;
+    }
+}