xref: /packages/apps/Calendar/src/com/android/calendar/event/EditEventFragment.java

/*
 * Copyright (C) 2010 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.calendar.event;

import com.android.calendar.AsyncQueryService;
import com.android.calendar.CalendarController;
import com.android.calendar.CalendarController.EventHandler;
import com.android.calendar.CalendarController.EventInfo;
import com.android.calendar.CalendarController.EventType;
import com.android.calendar.CalendarEventModel;
import com.android.calendar.CalendarEventModel.Attendee;
import com.android.calendar.DeleteEventHelper;
import com.android.calendar.R;
import com.android.calendar.Utils;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.content.AsyncQueryHandler;
import android.content.ContentProviderOperation;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Calendar.Attendees;
import android.provider.Calendar.Calendars;
import android.provider.Calendar.Events;
import android.provider.Calendar.Reminders;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.Toast;

import java.io.Serializable;
import java.util.ArrayList;

public class EditEventFragment extends Fragment implements EventHandler {
    private static final String TAG = "EditEventActivity";

    private static final String BUNDLE_KEY_MODEL = "key_model";
    private static final String BUNDLE_KEY_EDIT_STATE = "key_edit_state";
    private static final String BUNDLE_KEY_EVENT = "key_event";
    private static final String BUNDLE_KEY_READ_ONLY = "key_read_only";

    private static final boolean DEBUG = false;

    private static final int TOKEN_EVENT = 1;
    private static final int TOKEN_ATTENDEES = 1 << 1;
    private static final int TOKEN_REMINDERS = 1 << 2;
    private static final int TOKEN_CALENDARS = 1 << 3;
    private static final int TOKEN_ALL = TOKEN_EVENT | TOKEN_ATTENDEES | TOKEN_REMINDERS
            | TOKEN_CALENDARS;
    private static final int TOKEN_UNITIALIZED = 1 << 31;

    /**
     * A bitfield of TOKEN_* to keep track which query hasn't been completed
     * yet. Once all queries have returned, the model can be applied to the
     * view.
     */
    private int mOutstandingQueries = TOKEN_UNITIALIZED;

    EditEventHelper mHelper;
    CalendarEventModel mModel;
    CalendarEventModel mOriginalModel;
    CalendarEventModel mRestoreModel;
    EditEventView mView;
    QueryHandler mHandler;

    private AlertDialog mModifyDialog;
    int mModification = Utils.MODIFY_UNINITIALIZED;

    private EventInfo mEvent;
    private EventBundle mEventBundle;
    private Uri mUri;
    private long mBegin;
    private long mEnd;

    private Activity mContext;
    private Done mOnDone = new Done();
    private Menu mMenu;

    private boolean mSaveOnDetach = true;
    private boolean mIsReadOnly = false;
    public boolean mShowModifyDialogOnLaunch = false;

    private InputMethodManager mInputMethodManager;

    // TODO turn this into a helper function in EditEventHelper for building the
    // model
    private class QueryHandler extends AsyncQueryHandler {
        public QueryHandler(ContentResolver cr) {
            super(cr);
        }

        @Override
        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
            // If the query didn't return a cursor for some reason return
            if (cursor == null) {
                return;
            }

            // If the Activity is finishing, then close the cursor.
            // Otherwise, use the new cursor in the adapter.
            final Activity activity = EditEventFragment.this.getActivity();
            if (activity == null || activity.isFinishing()) {
                cursor.close();
                return;
            }
            long eventId;
            switch (token) {
                case TOKEN_EVENT:
                    if (cursor.getCount() == 0) {
                        // The cursor is empty. This can happen if the event
                        // was deleted.
                        cursor.close();
                        mOnDone.setDoneCode(Utils.DONE_EXIT);
                        mOnDone.run();
                        return;
                    }
                    mOriginalModel = new CalendarEventModel();
                    EditEventHelper.setModelFromCursor(mOriginalModel, cursor);
                    EditEventHelper.setModelFromCursor(mModel, cursor);
                    cursor.close();

                    mOriginalModel.mUri = mUri.toString();

                    mModel.mUri = mUri.toString();
                    mModel.mOriginalStart = mBegin;
                    mModel.mOriginalEnd = mEnd;
                    mModel.mIsFirstEventInSeries = mBegin == mOriginalModel.mStart;
                    mModel.mStart = mBegin;
                    mModel.mEnd = mEnd;

                    eventId = mModel.mId;

                    // TOKEN_ATTENDEES
                    if (mModel.mHasAttendeeData && eventId != -1) {
                        Uri attUri = Attendees.CONTENT_URI;
                        String[] whereArgs = {
                            Long.toString(eventId)
                        };
                        mHandler.startQuery(TOKEN_ATTENDEES, null, attUri,
                                EditEventHelper.ATTENDEES_PROJECTION,
                                EditEventHelper.ATTENDEES_WHERE /* selection */,
                                whereArgs /* selection args */, null /* sort order */);
                    } else {
                        setModelIfDone(TOKEN_ATTENDEES);
                    }

                    // TOKEN_REMINDERS
                    if (mModel.mHasAlarm) {
                        Uri rUri = Reminders.CONTENT_URI;
                        String[] remArgs = {
                                Long.toString(eventId), Integer.toString(Reminders.METHOD_ALERT),
                                Integer.toString(Reminders.METHOD_DEFAULT)
                        };
                        mHandler
                                .startQuery(TOKEN_REMINDERS, null, rUri,
                                        EditEventHelper.REMINDERS_PROJECTION,
                                        EditEventHelper.REMINDERS_WHERE /* selection */,
                                        remArgs /* selection args */, null /* sort order */);
                    } else {
                        setModelIfDone(TOKEN_REMINDERS);
                    }

                    // TOKEN_CALENDARS
                    String[] selArgs = {
                        Long.toString(mModel.mCalendarId)
                    };
                    mHandler.startQuery(TOKEN_CALENDARS, null, Calendars.CONTENT_URI,
                            EditEventHelper.CALENDARS_PROJECTION, EditEventHelper.CALENDARS_WHERE,
                            selArgs /* selection args */, null /* sort order */);

                    setModelIfDone(TOKEN_EVENT);
                    break;
                case TOKEN_ATTENDEES:
                    try {
                        while (cursor.moveToNext()) {
                            String name = cursor.getString(EditEventHelper.ATTENDEES_INDEX_NAME);
                            String email = cursor.getString(EditEventHelper.ATTENDEES_INDEX_EMAIL);
                            int status = cursor.getInt(EditEventHelper.ATTENDEES_INDEX_STATUS);
                            int relationship = cursor
                                    .getInt(EditEventHelper.ATTENDEES_INDEX_RELATIONSHIP);
                            if (relationship == Attendees.RELATIONSHIP_ORGANIZER) {
                                if (email != null) {
                                    mModel.mOrganizer = email;
                                    mModel.mIsOrganizer = mModel.mOwnerAccount
                                            .equalsIgnoreCase(email);
                                    mOriginalModel.mOrganizer = email;
                                    mOriginalModel.mIsOrganizer = mOriginalModel.mOwnerAccount
                                            .equalsIgnoreCase(email);
                                }

                                if (TextUtils.isEmpty(name)) {
                                    mModel.mOrganizerDisplayName = mModel.mOrganizer;
                                    mOriginalModel.mOrganizerDisplayName =
                                            mOriginalModel.mOrganizer;
                                } else {
                                    mModel.mOrganizerDisplayName = name;
                                    mOriginalModel.mOrganizerDisplayName = name;
                                }
                            }

                            if (email != null) {
                                if (mModel.mOwnerAccount != null &&
                                        mModel.mOwnerAccount.equalsIgnoreCase(email)) {
                                    int attendeeId =
                                        cursor.getInt(EditEventHelper.ATTENDEES_INDEX_ID);
                                    mModel.mOwnerAttendeeId = attendeeId;
                                    mModel.mSelfAttendeeStatus = status;
                                    mOriginalModel.mOwnerAttendeeId = attendeeId;
                                    mOriginalModel.mSelfAttendeeStatus = status;
                                    continue;
                                }
                            }
                            Attendee attendee = new Attendee(name, email);
                            attendee.mStatus = status;
                            mModel.addAttendee(attendee);
                            mOriginalModel.addAttendee(attendee);
                        }
                    } finally {
                        cursor.close();
                    }

                    setModelIfDone(TOKEN_ATTENDEES);
                    break;
                case TOKEN_REMINDERS:
                    try {
                        // Add all reminders to the models
                        while (cursor.moveToNext()) {
                            int minutes = cursor.getInt(EditEventHelper.REMINDERS_INDEX_MINUTES);
                            mModel.mReminderMinutes.add(minutes);
                            mOriginalModel.mReminderMinutes.add(minutes);
                        }
                    } finally {
                        cursor.close();
                    }

                    setModelIfDone(TOKEN_REMINDERS);
                    break;
                case TOKEN_CALENDARS:
                    try {
                        if (mModel.mCalendarId == -1) {
                            // Populate Calendar spinner only if no calendar is set e.g. new event
                            MatrixCursor matrixCursor = Utils.matrixCursorFromCursor(cursor);
                            if (DEBUG) {
                                Log.d(TAG, "onQueryComplete: setting cursor with "
                                        + matrixCursor.getCount() + " calendars");
                            }
                            mView.setCalendarsCursor(matrixCursor, isAdded() && isResumed());
                        } else {
                            // Populate model for an existing event
                            EditEventHelper.setModelFromCalendarCursor(mModel, cursor);
                            EditEventHelper.setModelFromCalendarCursor(mOriginalModel, cursor);
                        }
                    } finally {
                        cursor.close();
                    }

                    setModelIfDone(TOKEN_CALENDARS);
                    break;
            }
        }
    }

    private void setModelIfDone(int queryType) {
        synchronized (this) {
            mOutstandingQueries &= ~queryType;
            if (mOutstandingQueries == 0) {
                if (mRestoreModel != null) {
                    mModel = mRestoreModel;
                }
                if (mShowModifyDialogOnLaunch && mModification == Utils.MODIFY_UNINITIALIZED) {
                    if (!TextUtils.isEmpty(mModel.mRrule)) {
                        displayEditWhichDialog();
                    } else {
                        mModification = Utils.MODIFY_ALL;
                    }

                }
                mView.setModel(mModel);
                mView.setModification(mModification);
                if (mMenu != null) {
                    updateActionBar();
                }
            }
        }
    }

    private void updateActionBar() {
        if (mMenu == null) {
            return;
        }
        MenuItem cancelItem = mMenu.findItem(R.id.action_cancel);
        MenuItem deleteItem = mMenu.findItem(R.id.action_delete);
        MenuItem editItem = mMenu.findItem(R.id.action_edit);
        boolean canModifyEvent = EditEventHelper.canModifyEvent(mModel);
        boolean canModifyCalendar = EditEventHelper.canModifyCalendar(mModel);

        if (canModifyCalendar && mModel.mUri != null) {
            deleteItem.setVisible(true);
        } else {
            deleteItem.setVisible(false);
        }
        if (mIsReadOnly) {
            mMenu.findItem(R.id.action_done).setVisible(false);
        }
        if (mModification == Utils.MODIFY_UNINITIALIZED) {
            cancelItem.setVisible(false);
            if (canModifyEvent) {
                editItem.setVisible(true);
            } else {
                editItem.setVisible(false);
            }
            return;
        } else {
            editItem.setVisible(false);
        }
        boolean canRespond = EditEventHelper.canRespond(mModel);

        if (canRespond || canModifyEvent) {
            cancelItem.setVisible(true);
        } else {
            cancelItem.setVisible(false);
        }
    }

    public EditEventFragment() {
        this(null, false);
    }

    public EditEventFragment(EventInfo event, boolean readOnly) {
        mEvent = event;
        mIsReadOnly = readOnly;
        setHasOptionsMenu(true);
    }

    private void startQuery() {
        mUri = null;
        mBegin = -1;
        mEnd = -1;
        if (mEvent != null) {
            if (mEvent.id != -1) {
                mModel.mId = mEvent.id;
                mUri = ContentUris.withAppendedId(Events.CONTENT_URI, mEvent.id);
            }
            if (mEvent.startTime != null) {
                mBegin = mEvent.startTime.toMillis(true);
            }
            if (mEvent.endTime != null) {
                mEnd = mEvent.endTime.toMillis(true);
            }
        } else if (mEventBundle != null) {
            if (mEventBundle.id != -1) {
                mModel.mId = mEventBundle.id;
                mUri = ContentUris.withAppendedId(Events.CONTENT_URI, mEventBundle.id);
            }
            mBegin = mEventBundle.start;
            mEnd = mEventBundle.end;
        }

        if (mBegin <= 0) {
            // use a default value instead
            mBegin = mHelper.constructDefaultStartTime(System.currentTimeMillis());
        }
        if (mEnd < mBegin) {
            // use a default value instead
            mEnd = mHelper.constructDefaultEndTime(mBegin);
        }

        // Kick off the query for the event
        boolean newEvent = mUri == null;
        if (!newEvent) {
            mModel.mCalendarAccessLevel = Calendars.NO_ACCESS;
            mOutstandingQueries = TOKEN_ALL;
            if (DEBUG) {
                Log.d(TAG, "startQuery: uri for event is " + mUri.toString());
            }
            mHandler.startQuery(TOKEN_EVENT, null, mUri, EditEventHelper.EVENT_PROJECTION,
                    null /* selection */, null /* selection args */, null /* sort order */);
        } else {
            mOutstandingQueries = TOKEN_CALENDARS;
            if (DEBUG) {
                Log.d(TAG, "startQuery: Editing a new event.");
            }
            mModel.mStart = mBegin;
            mModel.mEnd = mEnd;
            mModel.mSelfAttendeeStatus = Attendees.ATTENDEE_STATUS_ACCEPTED;

            // Start a query in the background to read the list of calendars
            mHandler.startQuery(TOKEN_CALENDARS, null, Calendars.CONTENT_URI,
                    EditEventHelper.CALENDARS_PROJECTION,
                    EditEventHelper.CALENDARS_WHERE_WRITEABLE_VISIBLE, null /* selection args */,
                    null /* sort order */);

            mModification = Utils.MODIFY_ALL;
            updateActionBar();
            mView.setModification(mModification);
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        mContext = activity;

        mHelper = new EditEventHelper(activity, null);
        mHandler = new QueryHandler(activity.getContentResolver());
        mModel = new CalendarEventModel(activity);
        mInputMethodManager = (InputMethodManager)
                activity.getSystemService(Context.INPUT_METHOD_SERVICE);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
//        mContext.requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        View view;
        if (mIsReadOnly) {
            view = inflater.inflate(R.layout.edit_event_single_column, null);
        } else {
            view = inflater.inflate(R.layout.edit_event, null);
        }
        mView = new EditEventView(mContext, view, mOnDone);
        startQuery();
        return view;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            if (savedInstanceState.containsKey(BUNDLE_KEY_MODEL)) {
                mRestoreModel = (CalendarEventModel) savedInstanceState.getSerializable(
                        BUNDLE_KEY_MODEL);
            }
            if (savedInstanceState.containsKey(BUNDLE_KEY_EDIT_STATE)) {
                mModification = savedInstanceState.getInt(BUNDLE_KEY_EDIT_STATE);
            }
            if (savedInstanceState.containsKey(BUNDLE_KEY_EVENT)) {
                mEventBundle = (EventBundle) savedInstanceState.getSerializable(BUNDLE_KEY_EVENT);
            }
            if (savedInstanceState.containsKey(BUNDLE_KEY_READ_ONLY)) {
                mIsReadOnly = savedInstanceState.getBoolean(BUNDLE_KEY_READ_ONLY);
            }
        }
    }


    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.edit_event_title_bar, menu);
        synchronized (this) {
            mMenu = menu;
            updateActionBar();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_done:
                if (EditEventHelper.canModifyEvent(mModel) || EditEventHelper.canRespond(mModel)) {
                    if (mView != null && mView.prepareForSave()) {
                        if (mModification == Utils.MODIFY_UNINITIALIZED) {
                            mModification = Utils.MODIFY_ALL;
                        }
                        mOnDone.setDoneCode(Utils.DONE_SAVE | Utils.DONE_EXIT);
                        mOnDone.run();
                    } else {
                        mOnDone.setDoneCode(Utils.DONE_REVERT);
                        mOnDone.run();
                    }
                } else if (EditEventHelper.canAddReminders(mModel) && mModel.mId != -1
                        && mOriginalModel != null && mView.prepareForSave()) {
                    saveReminders();
                    mOnDone.setDoneCode(Utils.DONE_EXIT);
                    mOnDone.run();
                } else {
                    mOnDone.setDoneCode(Utils.DONE_REVERT);
                    mOnDone.run();
                }
                break;
            case R.id.action_cancel:
                mOnDone.setDoneCode(Utils.DONE_REVERT);
                mOnDone.run();
                break;
            case R.id.action_delete:
                mOnDone.setDoneCode(Utils.DONE_DELETE);
                mOnDone.run();
                break;
            case R.id.action_edit:
                if (mIsReadOnly) {
                    CalendarController.getInstance(mContext).sendEventRelatedEvent(this,
                            EventType.EDIT_EVENT, mModel.mId, mModel.mStart, mModel.mEnd, -1, -1);
                } else if (!TextUtils.isEmpty(mModel.mRrule)) {
                    displayEditWhichDialog();
                } else {
                    mModification = Utils.MODIFY_ALL;
                    updateActionBar();
                    mView.setModification(mModification);
                }
                break;
        }
        return true;
    }

    private void saveReminders() {
        ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>(3);
        boolean changed = EditEventHelper.saveReminders(ops, mModel.mId, mModel.mReminderMinutes,
                mOriginalModel.mReminderMinutes, false /* no force save */);

        if (!changed) {
            return;
        }

        AsyncQueryService service = new AsyncQueryService(getActivity());
        service.startBatch(0, null, Calendars.CONTENT_URI.getAuthority(), ops, 0);
        // Update the "hasAlarm" field for the event
        Uri uri = ContentUris.withAppendedId(Events.CONTENT_URI, mModel.mId);
        int len = mModel.mReminderMinutes.size();
        boolean hasAlarm = len > 0;
        if (hasAlarm != mOriginalModel.mHasAlarm) {
            ContentValues values = new ContentValues();
            values.put(Events.HAS_ALARM, hasAlarm ? 1 : 0);
            service.startUpdate(0, null, uri, values, null, null, 0);
        }

        Toast.makeText(mContext, R.string.saving_event, Toast.LENGTH_SHORT).show();
    }

    protected void displayEditWhichDialog() {
        if (!TextUtils.isEmpty(mModel.mRrule) && mModification == Utils.MODIFY_UNINITIALIZED) {
            final boolean notSynced = mModel.mSyncId == null;
            boolean isFirstEventInSeries = mModel.mIsFirstEventInSeries;
            int itemIndex = 0;
            CharSequence[] items;

            if (notSynced) {
                // If this event has not been synced, then don't allow deleting
                // or changing a single instance.
                if (isFirstEventInSeries) {
                    // Still display the option so the user knows all events are
                    // changing
                    items = new CharSequence[1];
                } else {
                    items = new CharSequence[2];
                }
            } else {
                if (isFirstEventInSeries) {
                    items = new CharSequence[2];
                } else {
                    items = new CharSequence[3];
                }
                items[itemIndex++] = mContext.getText(R.string.modify_event);
            }
            items[itemIndex++] = mContext.getText(R.string.modify_all);

            // Do one more check to make sure this remains at the end of the list
            if (!isFirstEventInSeries) {
                items[itemIndex++] = mContext.getText(R.string.modify_all_following);
            }

            // Display the modification dialog.
            if (mModifyDialog != null) {
                mModifyDialog.dismiss();
                mModifyDialog = null;
            }
            mModifyDialog = new AlertDialog.Builder(mContext)
                    .setTitle(R.string.edit_event_label).setItems(items, new OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    if (which == 0) {
                        mModification = notSynced ? Utils.MODIFY_ALL : Utils.MODIFY_SELECTED;
                        mModel.mOriginalEvent = notSynced ? null : mModel.mSyncId;
                    } else if (which == 1) {
                        mModification = notSynced ? Utils.MODIFY_ALL_FOLLOWING : Utils.MODIFY_ALL;
                    } else if (which == 2) {
                        mModification = Utils.MODIFY_ALL_FOLLOWING;
                    }

                    mView.setModification(mModification);
                    updateActionBar();
                }
            }).show();
        }
    }

    class Done implements EditEventHelper.EditDoneRunnable {
        private int mCode = -1;

        public void setDoneCode(int code) {
            mCode = code;
        }

        public void run() {
            // We only want this to get called once, either because the user
            // pressed back/home or one of the buttons on screen
            mSaveOnDetach = false;

            if ((mCode & Utils.DONE_SAVE) != 0 && mModel != null
                    && (EditEventHelper.canRespond(mModel)
                            || EditEventHelper.canModifyEvent(mModel))
                    && !isEmptyNewEvent()
                    && !mModel.isUnchanged(mOriginalModel)
                    && mHelper.saveEvent(mModel, mOriginalModel, mModification)) {
                int stringResource;
                if (mModel.mUri != null) {
                    stringResource = R.string.saving_event;
                } else {
                    stringResource = R.string.creating_event;
                }
                Toast.makeText(mContext, stringResource, Toast.LENGTH_SHORT).show();
            }

            if ((mCode & Utils.DONE_DELETE) != 0 && mModel != null
                    && EditEventHelper.canModifyCalendar(mModel)) {
                long begin = mModel.mStart;
                long end = mModel.mEnd;
                int which = -1;
                switch (mModification) {
                    case Utils.MODIFY_SELECTED:
                        which = DeleteEventHelper.DELETE_SELECTED;
                        break;
                    case Utils.MODIFY_ALL_FOLLOWING:
                        which = DeleteEventHelper.DELETE_ALL_FOLLOWING;
                        break;
                    case Utils.MODIFY_ALL:
                        which = DeleteEventHelper.DELETE_ALL;
                        break;
                }
                DeleteEventHelper deleteHelper = new DeleteEventHelper(
                        mContext, mContext, !mIsReadOnly /* exitWhenDone */);
                // TODO update delete helper to use the model instead of the cursor
                deleteHelper.delete(begin, end, mOriginalModel, which);
            }

            if ((mCode & Utils.DONE_EXIT) != 0) {
                // This will exit the edit event screen, should be called
                // when we want to return to the main calendar views
                EditEventFragment.this.getActivity().finish();
            }

            // Hide a software keyboard so that user won't see it even after this Fragment's
            // disappearing.
            final View focusedView = mContext.getCurrentFocus();
            if (focusedView != null) {
                mInputMethodManager.hideSoftInputFromWindow(focusedView.getWindowToken(), 0);
                focusedView.clearFocus();
            }
        }
    }

    boolean isEmptyNewEvent() {
        if (mOriginalModel != null) {
            // Not new
            return false;
        }

        return isEmpty();
    }

    private boolean isEmpty() {
        if (mModel.mTitle != null) {
            String title = mModel.mTitle.trim();
            if (title.length() > 0) {
                return false;
            }
        }

        if (mModel.mLocation != null) {
            String location = mModel.mLocation.trim();
            if (location.length() > 0) {
                return false;
            }
        }

        if (mModel.mDescription != null) {
            String description = mModel.mDescription.trim();
            if (description.length() > 0) {
                return false;
            }
        }

        return true;
    }

    @Override
    public void onPause() {
        Activity act = getActivity();
        if (mSaveOnDetach && act != null && !mIsReadOnly && !act.isChangingConfigurations()
                && mView.prepareForSave()) {
            mOnDone.setDoneCode(Utils.DONE_SAVE);
            mOnDone.run();
        }
        super.onPause();
    }

    @Override
    public void onDestroy() {
        if (mView != null) {
            mView.setModel(null);
        }
        if (mModifyDialog != null) {
            mModifyDialog.dismiss();
            mModifyDialog = null;
        }

        super.onDestroy();
    }

    @Override
    public void eventsChanged() {
        // TODO Requery to see if event has changed
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        mView.prepareForSave();
        outState.putSerializable(BUNDLE_KEY_MODEL, mModel);
        outState.putInt(BUNDLE_KEY_EDIT_STATE, mModification);
        if (mEventBundle == null && mEvent != null) {
            mEventBundle = new EventBundle();
            mEventBundle.id = mEvent.id;
            if (mEvent.startTime != null) {
                mEventBundle.start = mEvent.startTime.toMillis(true);
            }
            if (mEvent.endTime != null) {
                mEventBundle.end = mEvent.startTime.toMillis(true);
            }
        }

        outState.putSerializable(BUNDLE_KEY_EVENT, mEventBundle);
        outState.putBoolean(BUNDLE_KEY_READ_ONLY, mIsReadOnly);
    }

    @Override
    public long getSupportedEventTypes() {
        return EventType.USER_HOME;
    }

    @Override
    public void handleEvent(EventInfo event) {
        // It's currently unclear if we want to save the event or not when home
        // is pressed. When creating a new event we shouldn't save since we
        // can't get the id of the new event easily.
        if ((false && event.eventType == EventType.USER_HOME) || (event.eventType == EventType.GO_TO
                && mSaveOnDetach)) {
            if (mView != null && mView.prepareForSave()) {
                mOnDone.setDoneCode(Utils.DONE_SAVE);
                mOnDone.run();
            }
        }
    }

    private static class EventBundle implements Serializable {
        long id = -1;
        long start = -1;
        long end = -1;
    }
}