/*
* Copyright (C) 2012 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 android.preference;
import java.util.Arrays;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
/**
* @hide
* A {@link Preference} that displays a list of entries as
* a dialog which allow the user to toggle each individually on and off.
*
* @attr ref android.R.styleable#ListPreference_entries
* @attr ref android.R.styleable#ListPreference_entryValues
*/
public class MultiCheckPreference extends DialogPreference {
private CharSequence[] mEntries;
private String[] mEntryValues;
private boolean[] mSetValues;
private boolean[] mOrigValues;
private String mSummary;
public MultiCheckPreference(
Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
TypedArray a = context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.ListPreference, defStyleAttr, defStyleRes);
mEntries = a.getTextArray(com.android.internal.R.styleable.ListPreference_entries);
if (mEntries != null) {
setEntries(mEntries);
}
setEntryValuesCS(a.getTextArray(
com.android.internal.R.styleable.ListPreference_entryValues));
a.recycle();
/* Retrieve the Preference summary attribute since it's private
* in the Preference class.
*/
a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.Preference, 0, 0);
mSummary = a.getString(com.android.internal.R.styleable.Preference_summary);
a.recycle();
}
public MultiCheckPreference(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public MultiCheckPreference(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.dialogPreferenceStyle);
}
public MultiCheckPreference(Context context) {
this(context, null);
}
/**
* Sets the human-readable entries to be shown in the list. This will be
* shown in subsequent dialogs.
* <p>
* Each entry must have a corresponding index in
* {@link #setEntryValues(CharSequence[])}.
*
* @param entries The entries.
* @see #setEntryValues(CharSequence[])
*/
public void setEntries(CharSequence[] entries) {
mEntries = entries;
mSetValues = new boolean[entries.length];
mOrigValues = new boolean[entries.length];
}
/**
* @see #setEntries(CharSequence[])
* @param entriesResId The entries array as a resource.
*/
public void setEntries(int entriesResId) {
setEntries(getContext().getResources().getTextArray(entriesResId));
}
/**
* The list of entries to be shown in the list in subsequent dialogs.
*
* @return The list as an array.
*/
public CharSequence[] getEntries() {
return mEntries;
}
/**
* The array to find the value to save for a preference when an entry from
* entries is selected. If a user clicks on the second item in entries, the
* second item in this array will be saved to the preference.
*
* @param entryValues The array to be used as values to save for the preference.
*/
public void setEntryValues(String[] entryValues) {
mEntryValues = entryValues;
Arrays.fill(mSetValues, false);
Arrays.fill(mOrigValues, false);
}
/**
* @see #setEntryValues(CharSequence[])
* @param entryValuesResId The entry values array as a resource.
*/
public void setEntryValues(int entryValuesResId) {
setEntryValuesCS(getContext().getResources().getTextArray(entryValuesResId));
}
private void setEntryValuesCS(CharSequence[] values) {
setValues(null);
if (values != null) {
mEntryValues = new String[values.length];
for (int i=0; i<values.length; i++) {
mEntryValues[i] = values[i].toString();
}
}
}
/**
* Returns the array of values to be saved for the preference.
*
* @return The array of values.
*/
public String[] getEntryValues() {
return mEntryValues;
}
/**
* Get the boolean state of a given value.
*/
public boolean getValue(int index) {
return mSetValues[index];
}
/**
* Set the boolean state of a given value.
*/
public void setValue(int index, boolean state) {
mSetValues[index] = state;
}
/**
* Sets the current values.
*/
public void setValues(boolean[] values) {
if (mSetValues != null) {
Arrays.fill(mSetValues, false);
Arrays.fill(mOrigValues, false);
if (values != null) {
System.arraycopy(values, 0, mSetValues, 0,
values.length < mSetValues.length ? values.length : mSetValues.length);
}
}
}
/**
* Returns the summary of this ListPreference. If the summary
* has a {@linkplain java.lang.String#format String formatting}
* marker in it (i.e. "%s" or "%1$s"), then the current entry
* value will be substituted in its place.
*
* @return the summary with appropriate string substitution
*/
@Override
public CharSequence getSummary() {
if (mSummary == null) {
return super.getSummary();
} else {
return mSummary;
}
}
/**
* Sets the summary for this Preference with a CharSequence.
* If the summary has a
* {@linkplain java.lang.String#format String formatting}
* marker in it (i.e. "%s" or "%1$s"), then the current entry
* value will be substituted in its place when it's retrieved.
*
* @param summary The summary for the preference.
*/
@Override
public void setSummary(CharSequence summary) {
super.setSummary(summary);
if (summary == null && mSummary != null) {
mSummary = null;
} else if (summary != null && !summary.equals(mSummary)) {
mSummary = summary.toString();
}
}
/**
* Returns the currently selected values.
*/
public boolean[] getValues() {
return mSetValues;
}
/**
* Returns the index of the given value (in the entry values array).
*
* @param value The value whose index should be returned.
* @return The index of the value, or -1 if not found.
*/
public int findIndexOfValue(String value) {
if (value != null && mEntryValues != null) {
for (int i = mEntryValues.length - 1; i >= 0; i--) {
if (mEntryValues[i].equals(value)) {
return i;
}
}
}
return -1;
}
@Override
protected void onPrepareDialogBuilder(Builder builder) {
super.onPrepareDialogBuilder(builder);
if (mEntries == null || mEntryValues == null) {
throw new IllegalStateException(
"ListPreference requires an entries array and an entryValues array.");
}
mOrigValues = Arrays.copyOf(mSetValues, mSetValues.length);
builder.setMultiChoiceItems(mEntries, mSetValues,
new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
mSetValues[which] = isChecked;
}
});
}
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
if (positiveResult) {
if (callChangeListener(getValues())) {
return;
}
}
System.arraycopy(mOrigValues, 0, mSetValues, 0, mSetValues.length);
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getString(index);
}
@Override
protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
}
@Override
protected Parcelable onSaveInstanceState() {
final Parcelable superState = super.onSaveInstanceState();
if (isPersistent()) {
// No need to save instance state since it's persistent
return superState;
}
final SavedState myState = new SavedState(superState);
myState.values = getValues();
return myState;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (state == null || !state.getClass().equals(SavedState.class)) {
// Didn't save state for us in onSaveInstanceState
super.onRestoreInstanceState(state);
return;
}
SavedState myState = (SavedState) state;
super.onRestoreInstanceState(myState.getSuperState());
setValues(myState.values);
}
private static class SavedState extends BaseSavedState {
boolean[] values;
public SavedState(Parcel source) {
super(source);
values = source.createBooleanArray();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeBooleanArray(values);
}
public SavedState(Parcelable superState) {
super(superState);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}
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