/*
* Original code from Android MultiSelectListPreference
* Modified to add a drag and drop behavior
*
* Copyright (C) 2010 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.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.abewy.android.apps.klyph.R;
import com.mobeta.android.dslv.DragSortController;
import com.mobeta.android.dslv.DragSortListView;
/**
* A {@link Preference} that displays a list of entries as
* a dialog.
* <p>
* This preference will store a set of strings into the SharedPreferences. This
* set will contain one or more values from the
* {@link #setEntryValues(CharSequence[])} array.
*
* @attr ref R.styleable#MultiSelectDragListPreference_entries
* @attr ref R.styleable#MultiSelectDragListPreference_entryValues
*/
public class MultiSelectDragListPreference extends DialogPreference
{
private CharSequence[] mEntries;
private CharSequence[] mEntryValues;
private List<String> mValues = new ArrayList<String>();
private List<String> mNewValues = new ArrayList<String>();
private boolean mPreferenceChanged;
private DragSortListView listView;
public MultiSelectDragListPreference(Context context, AttributeSet attrs)
{
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.MultiSelectDragListPreference, 0, 0);
mEntries = a.getTextArray(R.styleable.MultiSelectDragListPreference_entries);
mEntryValues = a.getTextArray(R.styleable.MultiSelectDragListPreference_entryValues);
a.recycle();
}
public MultiSelectDragListPreference(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;
}
/**
* @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(CharSequence[] entryValues)
{
mEntryValues = entryValues;
}
/**
* @see #setEntryValues(CharSequence[])
* @param entryValuesResId The entry values array as a resource.
*/
public void setEntryValues(int entryValuesResId)
{
setEntryValues(getContext().getResources().getTextArray(entryValuesResId));
}
/**
* Returns the array of values to be saved for the preference.
*
* @return The array of values.
*/
public CharSequence[] getEntryValues()
{
return mEntryValues;
}
/**
* Sets the value of the key. This should contain entries in
* {@link #getEntryValues()}.
*
* @param values The values to set for the key.
*/
public void setValues(List<String> values)
{
mValues.clear();
mValues.addAll(values);
persistStringSet(values);
}
/**
* Attempts to persist a set of Strings to the
* {@link android.content.SharedPreferences}.
* <p>
* This will check if this Preference is persistent, get an editor from the
* {@link PreferenceManager}, put in the strings, and check if we should
* commit (and commit if so).
*
* @param values The values to persist.
* @return True if the Preference is persistent. (This is not whether the
* value was persisted, since we may not necessarily commit if there
* will be a batch commit later.)
* @see #getPersistedString(Set)
*
* @hide Pending API approval
*/
protected boolean persistStringSet(List<String> values)
{
if (shouldPersist())
{
// Shouldn't store null
if (values.equals(getPersistedStringSet("")))
{
// It's already there, so the same as persisting
return true;
}
SharedPreferences.Editor editor = mPreferenceManager.getSharedPreferences().edit();
editor.putString(getKey(), StringUtils.join(values, ","));
editor.commit();
return true;
}
return false;
}
/**
* Checks whether, at the given time this method is called,
* this Preference should store/restore its value(s) into the
* {@link SharedPreferences}. This, at minimum, checks whether this
* Preference is persistent and it currently has a key. Before you
* save/restore from the {@link SharedPreferences}, check this first.
*
* @return True if it should persist the value.
*/
protected boolean shouldPersist()
{
return mPreferenceManager != null && isPersistent() && hasKey();
}
/**
* Retrieves the current value of the key.
*/
public List<String> getValues()
{
return mValues;
}
/**
* 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;
}
private DragSortListView getListView()
{
return listView;
}
@Override
protected void onPrepareDialogBuilder(Builder builder)
{
super.onPrepareDialogBuilder(builder);
if (mEntries == null || mEntryValues == null)
{
throw new IllegalStateException("MultiSelectListPreference requires an entries array and "
+ "an entryValues array.");
}
String[] entries = new String[mEntries.length];
for (int i = 0; i < mEntries.length; i++)
{
entries[i] = mEntries[i].toString();
}
boolean [] selectedItems = getSelectedItems();
ArrayList<String> orderedList = new ArrayList<String>();
int n = selectedItems.length;
for (String value : mValues)
{
int index = ArrayUtils.indexOf(mEntryValues, value);
orderedList.add(mEntries[index].toString());
}
for (int i = 0; i < mEntries.length; i++)
{
if (!mValues.contains(mEntryValues[i]))
orderedList.add(mEntries[i].toString());
}
adapter = new ArrayAdapter<String>(getContext(), R.layout.item_list_preference_multi_drag, R.id.text,
orderedList);
listView = new DragSortListView(getContext(), null);
listView.setAdapter(adapter);
listView.setDropListener(onDrop);
listView.setDragEnabled(true);
listView.setFloatAlpha(0.8f);
DragSortController controller = new DragSortController(listView);
controller.setDragHandleId(R.id.drag_handle);
controller.setRemoveEnabled(false);
controller.setSortEnabled(true);
controller.setBackgroundColor(0xFFFFFF);
controller.setDragInitMode(DragSortController.ON_DOWN);
listView.setFloatViewManager(controller);
listView.setOnTouchListener(controller);
builder.setView(listView);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
{
mPreferenceChanged = true;
refreshNewValues();
}});
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
for (int i = 0; i < n; i++)
{
listView.setItemChecked(i, i < mValues.size());
}
/*
* boolean [] checkedItems = getSelectedItems();
* builder.setMultiChoiceItems(mEntries, checkedItems,
* new DialogInterface.OnMultiChoiceClickListener() {
* public void onClick(DialogInterface dialog, int which, boolean
* isChecked) {
* if (isChecked) {
* mPreferenceChanged |= mNewValues.add(mEntryValues[which].toString());
* } else {
* mPreferenceChanged |=
* mNewValues.remove(mEntryValues[which].toString());
* }
* }
* });
*/
mNewValues.clear();
mNewValues.addAll(mValues);
}
private ArrayAdapter<String> adapter;
private DragSortListView.DropListener onDrop = new DragSortListView.DropListener() {
@Override
public void drop(int from, int to)
{
if (from != to)
{
DragSortListView list = getListView();
String item = adapter.getItem(from);
adapter.remove(item);
adapter.insert(item, to);
list.moveCheckState(from, to);
mPreferenceChanged = true;
refreshNewValues();
}
}
};
private void refreshNewValues()
{
mNewValues.clear();
int n = adapter.getCount();
SparseBooleanArray checkedPositions = listView.getCheckedItemPositions();
for (int i = 0; i < n; i++)
{
if (checkedPositions.get(i) == true)
{
mNewValues.add((String) mEntryValues[ArrayUtils.indexOf(mEntries, adapter.getItem(i))]);
}
}
}
private boolean [] getSelectedItems()
{
final CharSequence[] entries = mEntryValues;
final int entryCount = entries.length;
final List<String> values = mValues;
boolean [] result = new boolean [entryCount];
for (int i = 0; i < entryCount; i++)
{
result[i] = values.contains(entries[i].toString());
}
return result;
}
@Override
protected void onDialogClosed(boolean positiveResult)
{
super.onDialogClosed(positiveResult);
if (positiveResult && mPreferenceChanged)
{
refreshNewValues();
final List<String> values = mNewValues;
if (callChangeListener(values) && values.size() > 0)
{
setValues(values);
}
}
mPreferenceChanged = false;
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index)
{
final CharSequence[] defaultValues = a.getTextArray(index);
final int valueCount = defaultValues.length;
final List<String> result = new ArrayList<String>();
for (int i = 0; i < valueCount; i++)
{
result.add(defaultValues[i].toString());
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void onSetInitialValue(boolean restoreValue, Object defaultValue)
{
List<String> v = (List<String>) defaultValue;
String defValue = PreferenceManager.getDefaultSharedPreferences(getContext()).getString(getKey(), StringUtils.join(v.toArray(), ","));
setValues(restoreValue ? getPersistedStringSet(StringUtils.join(mValues)) : Arrays.asList(defValue.split(",")));
}
PreferenceManager mPreferenceManager;
protected List<String> getPersistedStringSet(String defaultReturnValue)
{
if (!shouldPersist())
{
return Arrays.asList(defaultReturnValue.split(","));
}
return Arrays.asList(mPreferenceManager.getSharedPreferences().getString(getKey(), defaultReturnValue)
.split(","));
}
protected void onAttachedToHierarchy(PreferenceManager preferenceManager)
{
super.onAttachedToHierarchy(preferenceManager);
mPreferenceManager = preferenceManager;
}
@Override
protected Parcelable onSaveInstanceState()
{
final Parcelable superState = super.onSaveInstanceState();
if (isPersistent())
{
// No need to save instance state
return superState;
}
final SavedState myState = new SavedState(superState);
myState.values = StringUtils.join(getValues(), ",");
return myState;
}
private static class SavedState extends BaseSavedState
{
String values;
public SavedState(Parcel source)
{
super(source);
values = source.readString();
}
public SavedState(Parcelable superState)
{
super(superState);
}
@Override
public void writeToParcel(Parcel dest, int flags)
{
super.writeToParcel(dest, flags);
dest.writeString(values);
}
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];
}
};
}
}