src/com/android/calendar/EditResponseHelper.java

/*
 * Copyright (C) 2009 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.DialogInterface;
import android.widget.Button;

/**
 * A helper class for editing the response to an invitation when the invitation
 * is a repeating event.
 */
public class EditResponseHelper implements DialogInterface.OnClickListener {
    private final Activity mParent;
    private int mWhichEvents = -1;
    private AlertDialog mAlertDialog;

    /**
     * This callback is passed in to this object when this object is created
     * and is invoked when the "Ok" button is selected.
     */
    private DialogInterface.OnClickListener mDialogListener;

    public EditResponseHelper(Activity parent) {
        mParent = parent;
    }

    public void setOnClickListener(DialogInterface.OnClickListener listener) {
        mDialogListener = listener;
    }

    public int getWhichEvents() {
        return mWhichEvents;
    }

    public void setWhichEvents(int which) {
        mWhichEvents = which;
    }

    public void onClick(DialogInterface dialog, int which) {
    }

    /**
     * This callback is used when a list item is selected
     */
    private DialogInterface.OnClickListener mListListener =
            new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            mWhichEvents = which;

            // Enable the "ok" button now that the user has selected which
            // events in the series to delete.
            Button ok = mAlertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
            ok.setEnabled(true);
        }
    };

    public void showDialog(int whichEvents) {
        // We need to have a non-null listener, otherwise we get null when
        // we try to fetch the "Ok" button.
        if (mDialogListener == null) {
            mDialogListener = this;
        }
        AlertDialog dialog = new AlertDialog.Builder(mParent).setTitle(
                R.string.change_response_title).setIconAttribute(android.R.attr.alertDialogIcon)
                .setSingleChoiceItems(R.array.change_response_labels, whichEvents, mListListener)
                .setPositiveButton(android.R.string.ok, mDialogListener)
                .setNegativeButton(android.R.string.cancel, null).show();
        mAlertDialog = dialog;

        if (whichEvents == -1) {
            // Disable the "Ok" button until the user selects which events to
            // delete.
            Button ok = dialog.getButton(DialogInterface.BUTTON_POSITIVE);
            ok.setEnabled(false);
        }
    }
}