/*
* 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 org.ohmage;
import android.content.Context;
import android.os.Handler;
import android.text.InputFilter;
import android.text.InputType;
import android.text.Spanned;
import android.text.method.NumberKeyListener;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
/**
* A view for selecting a number
*
* For a dialog using this view, see {@link android.app.TimePickerDialog}.
* @hide
*/
public class NumberPicker extends LinearLayout {
/**
* The callback interface used to indicate the number value has been adjusted.
*/
public interface OnChangedListener {
/**
* @param picker The NumberPicker associated with this listener.
* @param oldVal The previous value.
* @param newVal The new value.
*/
void onChanged(NumberPicker picker, int oldVal, int newVal);
}
/**
* Interface used to format the number into a string for presentation
*/
public interface Formatter {
String toString(int value);
}
/*
* Use a custom NumberPicker formatting callback to use two-digit
* minutes strings like "01". Keeping a static formatter etc. is the
* most efficient way to do this; it avoids creating temporary objects
* on every call to format().
*/
public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER =
new NumberPicker.Formatter() {
final StringBuilder mBuilder = new StringBuilder();
final java.util.Formatter mFmt = new java.util.Formatter(
mBuilder, java.util.Locale.US);
final Object[] mArgs = new Object[1];
@Override
public String toString(int value) {
mArgs[0] = value;
mBuilder.delete(0, mBuilder.length());
mFmt.format("%02d", mArgs);
return mFmt.toString();
}
};
private final Handler mHandler;
private final Runnable mRunnable = new Runnable() {
@Override
public void run() {
validateInput(mText);
if (mIncrement) {
changeCurrent(mCurrent + 1);
mHandler.postDelayed(this, mSpeed);
} else if (mDecrement) {
changeCurrent(mCurrent - 1);
mHandler.postDelayed(this, mSpeed);
}
}
};
private final EditText mText;
private final InputFilter mNumberInputFilter;
private String[] mDisplayedValues;
/**
* Lower value of the range of numbers allowed for the NumberPicker
*/
private int mStart;
/**
* Upper value of the range of numbers allowed for the NumberPicker
*/
private int mEnd;
/**
* Current value of this NumberPicker
*/
private int mCurrent;
/**
* Previous value of this NumberPicker.
*/
private int mPrevious;
private OnChangedListener mListener;
private Formatter mFormatter;
private long mSpeed = 300;
private boolean mIncrement;
private boolean mDecrement;
/**
* Create a new number picker
* @param context the application environment
*/
public NumberPicker(Context context) {
this(context, null);
}
/**
* Create a new number picker
* @param context the application environment
* @param attrs a collection of attributes
*/
public NumberPicker(Context context, AttributeSet attrs) {
super(context, attrs);
setOrientation(VERTICAL);
LayoutInflater inflater =
(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.number_picker, this, true);
mHandler = new Handler();
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
validateInput(mText);
if (!mText.hasFocus()) mText.requestFocus();
// now perform the increment/decrement
if (R.id.increment == v.getId()) {
changeCurrent(mCurrent + 1);
} else if (R.id.decrement == v.getId()) {
changeCurrent(mCurrent - 1);
}
}
};
OnFocusChangeListener focusListener = new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
/* When focus is lost check that the text field
* has valid values.
*/
if (!hasFocus) {
validateInput(v);
}
}
};
OnLongClickListener longClickListener = new OnLongClickListener() {
/**
* We start the long click here but rely on the {@link NumberPickerButton}
* to inform us when the long click has ended.
*/
@Override
public boolean onLongClick(View v) {
/* The text view may still have focus so clear it's focus which will
* trigger the on focus changed and any typed values to be pulled.
*/
mText.clearFocus();
if (R.id.increment == v.getId()) {
mIncrement = true;
mHandler.post(mRunnable);
} else if (R.id.decrement == v.getId()) {
mDecrement = true;
mHandler.post(mRunnable);
}
return true;
}
};
InputFilter inputFilter = new NumberPickerInputFilter();
mNumberInputFilter = new NumberRangeKeyListener();
mIncrementButton = (NumberPickerButton) findViewById(R.id.increment);
mIncrementButton.setOnClickListener(clickListener);
mIncrementButton.setOnLongClickListener(longClickListener);
mIncrementButton.setNumberPicker(this);
mDecrementButton = (NumberPickerButton) findViewById(R.id.decrement);
mDecrementButton.setOnClickListener(clickListener);
mDecrementButton.setOnLongClickListener(longClickListener);
mDecrementButton.setNumberPicker(this);
mText = (EditText) findViewById(R.id.timepicker_input);
mText.setOnFocusChangeListener(focusListener);
mText.setFilters(new InputFilter[] {inputFilter});
mText.setRawInputType(InputType.TYPE_CLASS_NUMBER);
if (!isEnabled()) {
setEnabled(false);
}
}
/**
* Set the enabled state of this view. The interpretation of the enabled
* state varies by subclass.
*
* @param enabled True if this view is enabled, false otherwise.
*/
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
mIncrementButton.setEnabled(enabled);
mDecrementButton.setEnabled(enabled);
mText.setEnabled(enabled);
}
/**
* Set the callback that indicates the number has been adjusted by the user.
* @param listener the callback, should not be null.
*/
public void setOnChangeListener(OnChangedListener listener) {
mListener = listener;
}
/**
* Set the formatter that will be used to format the number for presentation
* @param formatter the formatter object. If formatter is null, String.valueOf()
* will be used
*/
public void setFormatter(Formatter formatter) {
mFormatter = formatter;
}
/**
* Set the range of numbers allowed for the number picker. The current
* value will be automatically set to the start.
*
* @param start the start of the range (inclusive)
* @param end the end of the range (inclusive)
*/
public void setRange(int start, int end) {
setRange(start, end, null/*displayedValues*/);
}
/**
* Set the range of numbers allowed for the number picker. The current
* value will be automatically set to the start. Also provide a mapping
* for values used to display to the user.
*
* @param start the start of the range (inclusive)
* @param end the end of the range (inclusive)
* @param displayedValues the values displayed to the user.
*/
public void setRange(int start, int end, String[] displayedValues) {
mDisplayedValues = displayedValues;
mStart = start;
mEnd = end;
mCurrent = start;
updateView();
if (displayedValues != null) {
// Allow text entry rather than strictly numeric entry.
mText.setRawInputType(InputType.TYPE_CLASS_TEXT |
InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
}
}
/**
* Set the current value for the number picker.
*
* @param current the current value the start of the range (inclusive)
* @throws IllegalArgumentException when current is not within the range
* of of the number picker
*/
public void setCurrent(int current) {
if (current < mStart || current > mEnd) {
throw new IllegalArgumentException(
"current should be >= start and <= end");
}
mCurrent = current;
updateView();
}
/**
* Sets the speed at which the numbers will scroll when the +/-
* buttons are longpressed
*
* @param speed The speed (in milliseconds) at which the numbers will scroll
* default 300ms
*/
public void setSpeed(long speed) {
mSpeed = speed;
}
private String formatNumber(int value) {
return (mFormatter != null)
? mFormatter.toString(value)
: String.valueOf(value);
}
/**
* Sets the current value of this NumberPicker, and sets mPrevious to the previous
* value. If current is greater than mEnd less than mStart, the value of mCurrent
* is wrapped around.
*
* Subclasses can override this to change the wrapping behavior
*
* @param current the new value of the NumberPicker
*/
protected void changeCurrent(int current) {
// Don't wrap around the values if we go past the start or end
if (current > mEnd) {
current = mEnd;
} else if (current < mStart) {
current = mStart;
}
mPrevious = mCurrent;
mCurrent = current;
notifyChange();
updateView();
}
/**
* Notifies the listener, if registered, of a change of the value of this
* NumberPicker.
*/
private void notifyChange() {
if (mListener != null) {
mListener.onChanged(this, mPrevious, mCurrent);
}
}
@Override
public void onDetachedFromWindow() {
super.onDetachedFromWindow();
validateInput(mText);
}
/**
* Updates the view of this NumberPicker. If displayValues were specified
* in {@link #setRange}, the string corresponding to the index specified by
* the current value will be returned. Otherwise, the formatter specified
* in {@link setFormatter} will be used to format the number.
*/
private void updateView() {
/* If we don't have displayed values then use the
* current number else find the correct value in the
* displayed values for the current number.
*/
if (mDisplayedValues == null) {
mText.setText(formatNumber(mCurrent));
} else {
mText.setText(mDisplayedValues[mCurrent - mStart]);
}
mText.setSelection(mText.getText().length());
}
private boolean validateCurrentView(CharSequence str) {
int val = getSelectedPos(str.toString());
if ((val >= mStart) && (val <= mEnd)) {
if (mCurrent != val) {
mPrevious = mCurrent;
mCurrent = val;
notifyChange();
}
}
updateView();
return (val >= mStart) && (val <= mEnd);
}
private boolean validateInput(View v) {
String str = String.valueOf(((TextView) v).getText());
if ("".equals(str)) {
// Restore to the old value as we don't allow empty values
updateView();
return false;
} else {
// Check the new value and ensure it's in range
return validateCurrentView(str);
}
}
/**
* @hide
*/
public void cancelIncrement() {
mIncrement = false;
}
/**
* @hide
*/
public void cancelDecrement() {
mDecrement = false;
}
private static final char[] DIGIT_CHARACTERS = new char[] {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
};
private NumberPickerButton mIncrementButton;
private NumberPickerButton mDecrementButton;
private class NumberPickerInputFilter implements InputFilter {
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
if (mDisplayedValues == null) {
return mNumberInputFilter.filter(source, start, end, dest, dstart, dend);
}
CharSequence filtered = String.valueOf(source.subSequence(start, end));
String result = String.valueOf(dest.subSequence(0, dstart))
+ filtered
+ dest.subSequence(dend, dest.length());
String str = String.valueOf(result).toLowerCase();
for (String val : mDisplayedValues) {
val = val.toLowerCase();
if (val.startsWith(str)) {
return filtered;
}
}
return "";
}
}
private class NumberRangeKeyListener extends NumberKeyListener {
// XXX This doesn't allow for range limits when controlled by a
// soft input method!
@Override
public int getInputType() {
return InputType.TYPE_CLASS_NUMBER;
}
@Override
protected char[] getAcceptedChars() {
return DIGIT_CHARACTERS;
}
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
CharSequence filtered = super.filter(source, start, end, dest, dstart, dend);
if (filtered == null) {
filtered = source.subSequence(start, end);
}
// Add the negative sign back in to the front if it was there if we accept negative numbers
if(mStart < 0 && source.length() > 0 && source.charAt(0) == '-')
filtered = "-" + filtered;
String result = String.valueOf(dest.subSequence(0, dstart))
+ filtered
+ dest.subSequence(dend, dest.length());
if ("".equals(result)) {
return result;
}
int val = getSelectedPos(result);
/* Ensure the user can't type in a value greater
* than the max allowed. We have to allow less than min
* as the user might want to delete some numbers
* and then type a new number.
*/
if (val > mEnd) {
return "";
} else {
return filtered;
}
}
}
private int getSelectedPos(String str) {
if (mDisplayedValues == null) {
try {
return Integer.parseInt(str);
} catch (NumberFormatException e) {
/* Ignore as if it's not a number we don't care */
}
} else {
for (int i = 0; i < mDisplayedValues.length; i++) {
/* Don't force the user to type in jan when ja will do */
str = str.toLowerCase();
if (mDisplayedValues[i].toLowerCase().startsWith(str)) {
return mStart + i;
}
}
/* The user might have typed in a number into the month field i.e.
* 10 instead of OCT so support that too.
*/
try {
return Integer.parseInt(str);
} catch (NumberFormatException e) {
/* Ignore as if it's not a number we don't care */
}
}
return mStart;
}
/**
* Returns the current value of the NumberPicker
* @return the current value.
*/
public int getCurrent() {
return mCurrent;
}
/**
* Returns the upper value of the range of the NumberPicker
* @return the uppper number of the range.
*/
protected int getEndRange() {
return mEnd;
}
/**
* Returns the lower value of the range of the NumberPicker
* @return the lower number of the range.
*/
protected int getBeginRange() {
return mStart;
}
public boolean forceValidateInput() {
return validateInput(mText);
}
}