DateWidget.java

/*
 * Copyright (C) 2009 University of Washington
 * 
 * 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 org.odk.collect.android.widgets;

import java.util.Calendar;
import java.util.Date;

import org.javarosa.core.model.data.DateData;
import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.form.api.FormEntryPrompt;
import org.joda.time.DateTime;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.view.Gravity;
import android.view.inputmethod.InputMethodManager;
import android.widget.DatePicker;

/**
 * Displays a DatePicker widget. DateWidget handles leap years and does not allow dates that do not
 * exist.
 * 
 * @author Carl Hartung (carlhartung@gmail.com)
 * @author Yaw Anokwa (yanokwa@gmail.com)
 */
public class DateWidget extends QuestionWidget {

    private DatePicker mDatePicker;
    private DatePicker.OnDateChangedListener mDateListener;


    @SuppressLint("NewApi")
    public DateWidget(Context context, FormEntryPrompt prompt) {
        super(context, prompt);
        mDatePicker = new DatePicker(getContext());
        mDatePicker.setFocusable(!prompt.isReadOnly());
        mDatePicker.setEnabled(!prompt.isReadOnly());
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            mDatePicker.setCalendarViewShown(false);
        }
        
        mDateListener = new DatePicker.OnDateChangedListener() {
        	/*
        	 * (non-Javadoc)
        	 * @see android.widget.DatePicker.OnDateChangedListener#onDateChanged(android.widget.DatePicker, int, int, int)
        	 */
            @Override
            public void onDateChanged(DatePicker view, int year, int month, int day) {
                if (mPrompt.isReadOnly()) {
                    setAnswer();
                } else {
                    // TODO support dates <1900 >2100
                    // handle leap years and number of days in month
                    // http://code.google.com/p/android/issues/detail?id=2081
                    Calendar c = Calendar.getInstance();
                    c.set(year, month, 1);
                    int max = c.getActualMaximum(Calendar.DAY_OF_MONTH);                        
                    if (day > max) {
                        //If the day has fallen out of spec, set it to the correct max
                        mDatePicker.updateDate(year, month, max);
                    } else {
                        if(!(mDatePicker.getDayOfMonth() == day && mDatePicker.getMonth() == month && mDatePicker.getYear() == year)) {
                            //CTS: No reason to change the day if it's already correct
                            mDatePicker.updateDate(year, month, day);
                            
                        } else{
                            return;
                        }
                    }
                }
                
                //TODO: Not here, the change isn't processed yet.
                widgetEntryChanged();
                
            }
        };

        // If there's an answer, use it.
        setAnswer();

        setGravity(Gravity.LEFT);
        addView(mDatePicker);
    }

    private void setAnswer() {
        if (getCurrentAnswer() != null) {
            DateTime ldt =
                new DateTime(((Date) ((DateData) getCurrentAnswer()).getValue()).getTime());
            mDatePicker.init(ldt.getYear(), ldt.getMonthOfYear() - 1, ldt.getDayOfMonth(),
                mDateListener);
        } else {
            // create date widget with current time as of right now
            clearAnswer();
        }
    }


    /*
     * (non-Javadoc)
     * @see org.odk.collect.android.widgets.QuestionWidget#clearAnswer()
     * Resets date to today.
     */
    @Override
    public void clearAnswer() {
        DateTime ldt = new DateTime();
        mDatePicker.init(ldt.getYear(), ldt.getMonthOfYear() - 1, ldt.getDayOfMonth(),
            mDateListener);
    }


    /*
     * (non-Javadoc)
     * @see org.odk.collect.android.widgets.QuestionWidget#getAnswer()
     */
    @Override
    public IAnswerData getAnswer() {
        mDatePicker.clearFocus();
        DateTime ldt = new DateTime(mDatePicker.getYear(), mDatePicker.getMonth() + 1,
                    mDatePicker.getDayOfMonth(), 0, 0);
       // DateTime utc = ldt.withZone(DateTimeZone.forID("UTC"));
        return new DateData(ldt.toDate());
    }


    /*
     * (non-Javadoc)
     * @see org.odk.collect.android.widgets.QuestionWidget#setFocus(android.content.Context)
     */
    @Override
    public void setFocus(Context context) {
        // Hide the soft keyboard if it's showing.
        InputMethodManager inputManager =
            (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        inputManager.hideSoftInputFromWindow(this.getWindowToken(), 0);
    }


    /*
     * (non-Javadoc)
     * @see org.odk.collect.android.widgets.QuestionWidget#setOnLongClickListener(android.view.View.OnLongClickListener)
     */
    @Override
    public void setOnLongClickListener(OnLongClickListener l) {
        mDatePicker.setOnLongClickListener(l);
    }


    /*
     * (non-Javadoc)
     * @see org.odk.collect.android.widgets.QuestionWidget#cancelLongPress()
     */
    @Override
    public void cancelLongPress() {
        super.cancelLongPress();
        mDatePicker.cancelLongPress();
    }

}