Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I11db999bd10656801e618f78ab2b2ef74136fff1

src/com/android/messaging/ui/attachmentchooser/AttachmentGridView.java

@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2015 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.messaging.ui.attachmentchooser;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.net.Uri;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.AttributeSet;
+import android.widget.GridView;
+
+import com.android.messaging.datamodel.data.MessagePartData;
+import com.android.messaging.ui.attachmentchooser.AttachmentChooserFragment.AttachmentGridAdapter;
+import com.android.messaging.util.Assert;
+import com.android.messaging.util.UiUtils;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Displays a grid of attachment previews for the user to choose which to select/unselect
+ */
+public class AttachmentGridView extends GridView implements
+        AttachmentGridItemView.HostInterface {
+    public interface AttachmentGridHost {
+        void displayPhoto(final Rect viewRect, final Uri photoUri);
+        void updateSelectionCount(final int count);
+    }
+
+    // By default everything is selected so only need to keep track of the unselected set.
+    private final Set<MessagePartData> mUnselectedSet;
+    private AttachmentGridHost mHost;
+
+    public AttachmentGridView(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+        mUnselectedSet = new HashSet<>();
+    }
+
+    public void setHost(final AttachmentGridHost host) {
+        mHost = host;
+    }
+
+    @Override
+    public boolean isItemSelected(final MessagePartData attachment) {
+        return !mUnselectedSet.contains(attachment);
+    }
+
+    @Override
+    public void onItemClicked(final AttachmentGridItemView view, final MessagePartData attachment) {
+        // If the item is an image, show the photo viewer. All the other types (video, audio,
+        // vcard) have internal click handling for showing previews so we don't need to handle them
+        if (attachment.isImage()) {
+            mHost.displayPhoto(UiUtils.getMeasuredBoundsOnScreen(view), attachment.getContentUri());
+        }
+    }
+
+    @Override
+    public void onItemCheckedChanged(AttachmentGridItemView view, MessagePartData attachment) {
+        // Toggle selection.
+        if (isItemSelected(attachment)) {
+            mUnselectedSet.add(attachment);
+        } else {
+            mUnselectedSet.remove(attachment);
+        }
+        view.updateSelectedState();
+        updateSelectionCount();
+    }
+
+    public Set<MessagePartData> getUnselectedAttachments() {
+        return Collections.unmodifiableSet(mUnselectedSet);
+    }
+
+    private void updateSelectionCount() {
+        final int count = getAdapter().getCount() - mUnselectedSet.size();
+        Assert.isTrue(count >= 0);
+        mHost.updateSelectionCount(count);
+    }
+
+    private void refreshViews() {
+        if (getAdapter() instanceof AttachmentGridAdapter) {
+            ((AttachmentGridAdapter) getAdapter()).notifyDataSetChanged();
+        }
+    }
+
+    @Override
+    public Parcelable onSaveInstanceState() {
+        final Parcelable superState = super.onSaveInstanceState();
+        final SavedState savedState = new SavedState(superState);
+        savedState.unselectedParts = mUnselectedSet
+                .toArray(new MessagePartData[mUnselectedSet.size()]);
+        return savedState;
+    }
+
+    @Override
+    public void onRestoreInstanceState(final Parcelable state) {
+        if (!(state instanceof SavedState)) {
+            super.onRestoreInstanceState(state);
+            return;
+        }
+
+        final SavedState savedState = (SavedState) state;
+        super.onRestoreInstanceState(savedState.getSuperState());
+        mUnselectedSet.clear();
+        for (int i = 0; i < savedState.unselectedParts.length; i++) {
+            final MessagePartData unselectedPart = savedState.unselectedParts[i];
+            mUnselectedSet.add(unselectedPart);
+        }
+        refreshViews();
+    }
+
+    /**
+     * Persists the item selection state to saved instance state so we can restore on activity
+     * recreation
+     */
+    public static class SavedState extends BaseSavedState {
+        MessagePartData[] unselectedParts;
+
+        SavedState(final Parcelable superState) {
+            super(superState);
+        }
+
+        private SavedState(final Parcel in) {
+            super(in);
+
+            // Read parts
+            final int partCount = in.readInt();
+            unselectedParts = new MessagePartData[partCount];
+            for (int i = 0; i < partCount; i++) {
+                unselectedParts[i] = ((MessagePartData) in.readParcelable(
+                        MessagePartData.class.getClassLoader()));
+            }
+        }
+
+        @Override
+        public void writeToParcel(final Parcel out, final int flags) {
+            super.writeToParcel(out, flags);
+
+            // Write parts
+            out.writeInt(unselectedParts.length);
+            for (final MessagePartData image : unselectedParts) {
+                out.writeParcelable(image, flags);
+            }
+        }
+
+        public static final Parcelable.Creator<SavedState> CREATOR =
+                new Parcelable.Creator<SavedState>() {
+            @Override
+            public SavedState createFromParcel(final Parcel in) {
+                return new SavedState(in);
+            }
+            @Override
+            public SavedState[] newArray(final int size) {
+                return new SavedState[size];
+            }
+        };
+    }
+}