| /* |
| * Copyright (C) 2013 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.settings.accessibility; |
| |
| import android.app.AlertDialog; |
| import android.app.Dialog; |
| 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; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.AbsListView; |
| import android.widget.AdapterView; |
| import android.widget.BaseAdapter; |
| |
| import com.android.settingslib.CustomDialogPreference; |
| |
| /** |
| * Abstract dialog preference that displays a set of values and optional titles. |
| */ |
| public abstract class ListDialogPreference extends CustomDialogPreference { |
| private CharSequence[] mEntryTitles; |
| private int[] mEntryValues; |
| |
| private OnValueChangedListener mOnValueChangedListener; |
| |
| /** The layout resource to use for grid items. */ |
| private int mListItemLayout; |
| |
| /** The current value of this preference. */ |
| private int mValue; |
| |
| /** The index within the value set of the current value. */ |
| private int mValueIndex; |
| |
| /** Whether the value had been set using {@link #setValue}. */ |
| private boolean mValueSet; |
| |
| public ListDialogPreference(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| /** |
| * Sets a listened to invoke when the value of this preference changes. |
| * |
| * @param listener the listener to invoke |
| */ |
| public void setOnValueChangedListener(OnValueChangedListener listener) { |
| mOnValueChangedListener = listener; |
| } |
| |
| /** |
| * Sets the layout to use for grid items. |
| * |
| * @param layoutResId the layout to use for displaying grid items |
| */ |
| public void setListItemLayoutResource(int layoutResId) { |
| mListItemLayout = layoutResId; |
| } |
| |
| /** |
| * Sets the list of item values. Values must be distinct. |
| * |
| * @param values the list of item values |
| */ |
| public void setValues(int[] values) { |
| mEntryValues = values; |
| |
| if (mValueSet && mValueIndex == AbsListView.INVALID_POSITION) { |
| mValueIndex = getIndexForValue(mValue); |
| } |
| } |
| |
| /** |
| * Sets the list of item titles. May be null if no titles are specified, or |
| * may be shorter than the list of values to leave some titles unspecified. |
| * |
| * @param titles the list of item titles |
| */ |
| public void setTitles(CharSequence[] titles) { |
| mEntryTitles = titles; |
| } |
| |
| /** |
| * Populates a list item view with data for the specified index. |
| * |
| * @param view the view to populate |
| * @param index the index for which to populate the view |
| * @see #setListItemLayoutResource(int) |
| * @see #getValueAt(int) |
| * @see #getTitleAt(int) |
| */ |
| protected abstract void onBindListItem(View view, int index); |
| |
| /** |
| * @return the title at the specified index, or null if none specified |
| */ |
| protected CharSequence getTitleAt(int index) { |
| if (mEntryTitles == null || mEntryTitles.length <= index) { |
| return null; |
| } |
| |
| return mEntryTitles[index]; |
| } |
| |
| /** |
| * @return the value at the specified index |
| */ |
| protected int getValueAt(int index) { |
| return mEntryValues[index]; |
| } |
| |
| @Override |
| public CharSequence getSummary() { |
| if (mValueIndex >= 0) { |
| return getTitleAt(mValueIndex); |
| } |
| |
| return null; |
| } |
| |
| @Override |
| protected void onPrepareDialogBuilder(AlertDialog.Builder builder, |
| DialogInterface.OnClickListener listener) { |
| super.onPrepareDialogBuilder(builder, listener); |
| |
| final Context context = getContext(); |
| final int dialogLayout = getDialogLayoutResource(); |
| final View picker = LayoutInflater.from(context).inflate(dialogLayout, null); |
| final ListPreferenceAdapter adapter = new ListPreferenceAdapter(); |
| final AbsListView list = (AbsListView) picker.findViewById(android.R.id.list); |
| list.setAdapter(adapter); |
| list.setOnItemClickListener(new AdapterView.OnItemClickListener() { |
| @Override |
| public void onItemClick(AdapterView<?> adapter, View v, int position, long id) { |
| if (callChangeListener((int) id)) { |
| setValue((int) id); |
| } |
| |
| final Dialog dialog = getDialog(); |
| if (dialog != null) { |
| dialog.dismiss(); |
| } |
| } |
| }); |
| |
| // Set initial selection. |
| final int selectedPosition = getIndexForValue(mValue); |
| if (selectedPosition != AbsListView.INVALID_POSITION) { |
| list.setSelection(selectedPosition); |
| } |
| |
| builder.setView(picker); |
| builder.setPositiveButton(null, null); |
| } |
| |
| /** |
| * @return the index of the specified value within the list of entry values, |
| * or {@link AbsListView#INVALID_POSITION} if not found |
| */ |
| protected int getIndexForValue(int value) { |
| final int[] values = mEntryValues; |
| if (values != null) { |
| final int count = values.length; |
| for (int i = 0; i < count; i++) { |
| if (values[i] == value) { |
| return i; |
| } |
| } |
| } |
| |
| return AbsListView.INVALID_POSITION; |
| } |
| |
| /** |
| * Sets the current value. If the value exists within the set of entry |
| * values, updates the selection index. |
| * |
| * @param value the value to set |
| */ |
| public void setValue(int value) { |
| final boolean changed = mValue != value; |
| if (changed || !mValueSet) { |
| mValue = value; |
| mValueIndex = getIndexForValue(value); |
| mValueSet = true; |
| persistInt(value); |
| if (changed) { |
| notifyDependencyChange(shouldDisableDependents()); |
| notifyChanged(); |
| } |
| if (mOnValueChangedListener != null) { |
| mOnValueChangedListener.onValueChanged(this, value); |
| } |
| } |
| } |
| |
| /** |
| * @return the current value |
| */ |
| public int getValue() { |
| return mValue; |
| } |
| |
| @Override |
| protected Object onGetDefaultValue(TypedArray a, int index) { |
| return a.getInt(index, 0); |
| } |
| |
| @Override |
| protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { |
| setValue(restoreValue ? getPersistedInt(mValue) : (Integer) 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.value = getValue(); |
| 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()); |
| setValue(myState.value); |
| } |
| |
| private class ListPreferenceAdapter extends BaseAdapter { |
| private LayoutInflater mInflater; |
| |
| @Override |
| public int getCount() { |
| return mEntryValues.length; |
| } |
| |
| @Override |
| public Integer getItem(int position) { |
| return mEntryValues[position]; |
| } |
| |
| @Override |
| public long getItemId(int position) { |
| return mEntryValues[position]; |
| } |
| |
| @Override |
| public boolean hasStableIds() { |
| return true; |
| } |
| |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| if (convertView == null) { |
| if (mInflater == null) { |
| mInflater = LayoutInflater.from(parent.getContext()); |
| } |
| convertView = mInflater.inflate(mListItemLayout, parent, false); |
| } |
| onBindListItem(convertView, position); |
| return convertView; |
| } |
| } |
| |
| private static class SavedState extends BaseSavedState { |
| public int value; |
| |
| public SavedState(Parcel source) { |
| super(source); |
| value = source.readInt(); |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| super.writeToParcel(dest, flags); |
| dest.writeInt(value); |
| } |
| |
| public SavedState(Parcelable superState) { |
| super(superState); |
| } |
| |
| @SuppressWarnings({ "hiding", "unused" }) |
| public static final Creator<SavedState> CREATOR = new Creator<SavedState>() { |
| @Override |
| public SavedState createFromParcel(Parcel in) { |
| return new SavedState(in); |
| } |
| |
| @Override |
| public SavedState[] newArray(int size) { |
| return new SavedState[size]; |
| } |
| }; |
| } |
| |
| public interface OnValueChangedListener { |
| public void onValueChanged(ListDialogPreference preference, int value); |
| } |
| } |