diff options
Diffstat (limited to 'src/com/android/calendar/DeleteEventHelper.java')
| -rw-r--r-- | src/com/android/calendar/DeleteEventHelper.java | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/com/android/calendar/DeleteEventHelper.java b/src/com/android/calendar/DeleteEventHelper.java new file mode 100644 index 00000000..7f958b71 --- /dev/null +++ b/src/com/android/calendar/DeleteEventHelper.java @@ -0,0 +1,306 @@ +/* + * Copyright (C) 2008 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; + +import android.app.Activity; +import android.app.AlertDialog; +import android.content.ContentResolver; +import android.content.ContentUris; +import android.content.ContentValues; +import android.content.DialogInterface; +import android.database.Cursor; +import android.net.Uri; +import android.pim.EventRecurrence; +import android.pim.Time; +import android.provider.Calendar; +import android.provider.Calendar.Events; + +/** + * A helper class for deleting events. If a normal event is selected for + * deletion, then this pops up a confirmation dialog. If the user confirms, + * then the normal event is deleted. + * + * <p> + * If a repeating event is selected for deletion, then this pops up dialog + * asking if the user wants to delete just this one instance, or all the + * events in the series, or this event plus all following events. The user + * may also cancel the delete. + * </p> + * + * <p> + * To use this class, create an instance, passing in the parent activity + * and a boolean that determines if the parent activity should exit if the + * event is deleted. Then to use the instance, call one of the + * {@link delete()} methods on this class. + * + * An instance of this class may be created once and reused (by calling + * {@link #delete()} multiple times). + */ +public class DeleteEventHelper { + + private final Activity mParent; + private final ContentResolver mContentResolver; + + private long mStartMillis; + private long mEndMillis; + private Cursor mCursor; + + /** + * If true, then call finish() on the parent activity when done. + */ + private boolean mExitWhenDone; + + /** + * These are the corresponding indices into the array of strings + * "R.array.delete_repeating_labels" in the resource file. + */ + static final int DELETE_SELECTED = 0; + static final int DELETE_ALL_FOLLOWING = 1; + static final int DELETE_ALL = 2; + + private int mWhichDelete; + + private static final String[] EVENT_PROJECTION = new String[] { + Events._ID, + Events.TITLE, + Events.ALL_DAY, + Events.CALENDAR_ID, + Events.RRULE, + Events.DTSTART, + Events._SYNC_ID, + Events.EVENT_TIMEZONE, + }; + + private int mEventIndexId; + private int mEventIndexRrule; + + public DeleteEventHelper(Activity parent, boolean exitWhenDone) { + mParent = parent; + mContentResolver = mParent.getContentResolver(); + mExitWhenDone = exitWhenDone; + } + + public void setExitWhenDone(boolean exitWhenDone) { + mExitWhenDone = exitWhenDone; + } + + /** + * This callback is used when a normal event is deleted. + */ + private DialogInterface.OnClickListener mDeleteNormalDialogListener = + new DialogInterface.OnClickListener() { + public void onClick(DialogInterface dialog, int button) { + long id = mCursor.getInt(mEventIndexId); + Uri uri = ContentUris.withAppendedId(Calendar.Events.CONTENT_URI, id); + mContentResolver.delete(uri, null /* where */, null /* selectionArgs */); + if (mExitWhenDone) { + mParent.finish(); + } + } + }; + + /** + * This callback is used when a list item for a repeating event is selected + */ + private DialogInterface.OnClickListener mDeleteListListener = + new DialogInterface.OnClickListener() { + public void onClick(DialogInterface dialog, int button) { + mWhichDelete = button; + } + }; + + /** + * This callback is used when a repeating event is deleted. + */ + private DialogInterface.OnClickListener mDeleteRepeatingDialogListener = + new DialogInterface.OnClickListener() { + public void onClick(DialogInterface dialog, int button) { + if (mWhichDelete != -1) { + deleteRepeatingEvent(mWhichDelete); + } + } + }; + + /** + * Does the required processing for deleting an event, which includes + * first popping up a dialog asking for confirmation (if the event is + * a normal event) or a dialog asking which events to delete (if the + * event is a repeating event). The "which" parameter is used to check + * the initial selection and is only used for repeating events. Set + * "which" to -1 to have nothing selected initially. + * + * @param begin the begin time of the event, in UTC milliseconds + * @param end the end time of the event, in UTC milliseconds + * @param eventId the event id + * @param which one of the values {@link DELETE_SELECTED}, + * {@link DELETE_ALL_FOLLOWING}, {@link DELETE_ALL}, or -1 + */ + public void delete(long begin, long end, long eventId, int which) { + Uri uri = ContentUris.withAppendedId(Calendar.Events.CONTENT_URI, eventId); + Cursor cursor = mParent.managedQuery(uri, EVENT_PROJECTION, null, null); + if (cursor == null) { + return; + } + cursor.moveToFirst(); + delete(begin, end, cursor, which); + } + + /** + * Does the required processing for deleting an event. This method + * takes a {@link Cursor} object as a parameter, which must point to + * a row in the Events table containing the required database fields. + * The required fields for a normal event are: + * + * <ul> + * <li> Events._ID </li> + * <li> Events.TITLE </li> + * <li> Events.RRULE </li> + * </ul> + * + * The required fields for a repeating event include the above plus the + * following fields: + * + * <ul> + * <li> Events.ALL_DAY </li> + * <li> Events.CALENDAR_ID </li> + * <li> Events.DTSTART </li> + * <li> Events._SYNC_ID </li> + * <li> Events.EVENT_TIMEZONE </li> + * </ul> + * + * @param begin the begin time of the event, in UTC milliseconds + * @param end the end time of the event, in UTC milliseconds + * @param cursor the database cursor containing the required fields + * @param which one of the values {@link DELETE_SELECTED}, + * {@link DELETE_ALL_FOLLOWING}, {@link DELETE_ALL}, or -1 + */ + public void delete(long begin, long end, Cursor cursor, int which) { + mWhichDelete = which; + mStartMillis = begin; + mEndMillis = end; + mCursor = cursor; + mEventIndexId = mCursor.getColumnIndexOrThrow(Events._ID); + mEventIndexRrule = mCursor.getColumnIndexOrThrow(Events.RRULE); + + // If this is a repeating event, then pop up a dialog asking the + // user if they want to delete all of the repeating events or + // just some of them. + String rRule = mCursor.getString(mEventIndexRrule); + if (rRule == null) { + // This is a normal event. Pop up a confirmation dialog. + new AlertDialog.Builder(mParent) + .setTitle(R.string.delete_title) + .setMessage(R.string.delete_this_event_title) + .setIcon(android.R.drawable.ic_dialog_alert) + .setPositiveButton(R.string.ok_label, mDeleteNormalDialogListener) + .setNegativeButton(R.string.cancel_label, null) + .show(); + } else { + // This is a repeating event. Pop up a dialog asking which events + // to delete. + new AlertDialog.Builder(mParent) + .setTitle(R.string.delete_title) + .setIcon(android.R.drawable.ic_dialog_alert) + .setSingleChoiceItems(R.array.delete_repeating_labels, which, mDeleteListListener) + .setPositiveButton(R.string.ok_label, mDeleteRepeatingDialogListener) + .setNegativeButton(R.string.cancel_label, null) + .show(); + } + } + + private void deleteRepeatingEvent(int which) { + int indexDtstart = mCursor.getColumnIndexOrThrow(Events.DTSTART); + int indexSyncId = mCursor.getColumnIndexOrThrow(Events._SYNC_ID); + int indexAllDay = mCursor.getColumnIndexOrThrow(Events.ALL_DAY); + int indexTitle = mCursor.getColumnIndexOrThrow(Events.TITLE); + int indexTimezone = mCursor.getColumnIndexOrThrow(Events.EVENT_TIMEZONE); + int indexCalendarId = mCursor.getColumnIndexOrThrow(Events.CALENDAR_ID); + + String rRule = mCursor.getString(mEventIndexRrule); + boolean allDay = mCursor.getInt(indexAllDay) != 0; + long dtstart = mCursor.getLong(indexDtstart); + long id = mCursor.getInt(mEventIndexId); + + switch (which) { + case DELETE_SELECTED: + { + // Create a recurrence exception by creating a new event + // with the status "cancelled". + ContentValues values = new ContentValues(); + + // The title might not be necessary, but it makes it easier + // to find this entry in the database when there is a problem. + String title = mCursor.getString(indexTitle); + values.put(Events.TITLE, title); + + String syncId = mCursor.getString(indexSyncId); + String timezone = mCursor.getString(indexTimezone); + int calendarId = mCursor.getInt(indexCalendarId); + values.put(Events.EVENT_TIMEZONE, timezone); + values.put(Events.CALENDAR_ID, calendarId); + values.put(Events.DTSTART, mStartMillis); + values.put(Events.DTEND, mEndMillis); + values.put(Events.ORIGINAL_EVENT, syncId); + values.put(Events.ORIGINAL_INSTANCE_TIME, mStartMillis); + values.put(Events.STATUS, Events.STATUS_CANCELED); + + mContentResolver.insert(Events.CONTENT_URI, values); + break; + } + case DELETE_ALL: { + Uri uri = ContentUris.withAppendedId(Calendar.Events.CONTENT_URI, id); + mContentResolver.delete(uri, null /* where */, null /* selectionArgs */); + break; + } + case DELETE_ALL_FOLLOWING: { + // If we are deleting the first event in the series and all + // following events, then delete them all. + if (dtstart == mStartMillis) { + Uri uri = ContentUris.withAppendedId(Calendar.Events.CONTENT_URI, id); + mContentResolver.delete(uri, null /* where */, null /* selectionArgs */); + break; + } + + // Modify the repeating event to end just before this event time + EventRecurrence eventRecurrence = new EventRecurrence(); + eventRecurrence.parse(rRule); + Time date = new Time(); + if (allDay) { + date.timezone = Time.TIMEZONE_UTC; + } + date.set(mStartMillis); + date.second--; + date.normalize(false); + + // Google calendar seems to require the UNTIL string to be + // in UTC. + date.switchTimezone(Time.TIMEZONE_UTC); + eventRecurrence.until = date.format2445(); + + ContentValues values = new ContentValues(); + values.put(Events.DTSTART, dtstart); + values.put(Events.RRULE, eventRecurrence.toString()); + Uri uri = ContentUris.withAppendedId(Calendar.Events.CONTENT_URI, id); + mContentResolver.update(uri, values, null, null); + break; + } + } + if (mExitWhenDone) { + mParent.finish(); + } + } +} |