EhViewer/src/com/hippo/ehviewer/preference/ListPreference.java

/*
 * Copyright (C) 2014 Hippo Seven
 *
 * 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.hippo.ehviewer.preference;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;

import com.hippo.ehviewer.app.MaterialAlertDialog;
import com.hippo.ehviewer.app.MaterialAlertDialog.Builder;

public class ListPreference extends DialogPreference {

    private CharSequence[] mEntries;
    private CharSequence[] mEntryValues;
    private String mValue;
    private String mSummary;
    private int mClickedDialogEntryIndex;
    private boolean mValueSet;

    public ListPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs, 0);
    }

    public ListPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs, defStyle);
    }

    private void init(Context context, AttributeSet attrs, int defStyle) {
        TypedArray a = context.obtainStyledAttributes(attrs,
                new int[]{ 16842930, 16843256 }, 0, 0);
        mEntries = a.getTextArray(0);
        mEntryValues = a.getTextArray(1);
        a.recycle();

        a = context.obtainStyledAttributes(attrs,
                new int[]{ 16842754, 16842765, 16842766,
                16842994, 16843233, 16843238, 16843240,
                16843241, 16843242, 16843243, 16843244,
                16843245, 16843246, 16843491 }, 0, 0);
        mSummary = a.getString(7);
        a.recycle();
    }

    public void setEntries(CharSequence[] entries) {
        mEntries = entries;
    }

    public void setEntries(int entriesResId) {
        setEntries(getContext().getResources().getTextArray(entriesResId));
    }

    public CharSequence[] getEntries() {
        return mEntries;
    }

    public void setEntryValues(CharSequence[] entryValues) {
        mEntryValues = entryValues;
    }

    public void setEntryValues(int entryValuesResId) {
        setEntryValues(getContext().getResources().getTextArray(entryValuesResId));
    }

    public CharSequence[] getEntryValues() {
        return mEntryValues;
    }

    public void setValue(String value) {
        // Always persist/notify the first time.
        final boolean changed = !TextUtils.equals(mValue, value);
        if (changed || !mValueSet) {
            mValue = value;
            mValueSet = true;
            persistString(value);
            if (changed) {
                notifyChanged();
            }
        }
    }

    @Override
    public CharSequence getSummary() {
        final CharSequence entry = getEntry();
        if (entry == null) {
            return super.getSummary();
        } else if (mSummary == null) {
            return entry;
        } else {
            return String.format(mSummary, entry);
        }
    }

    @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();
        }
    }

    public void setValueIndex(int index) {
        if (mEntryValues != null) {
            setValue(mEntryValues[index].toString());
        }
    }

    public String getValue() {
        return mValue;
    }

    public CharSequence getEntry() {
        int index = getValueIndex();
        return index >= 0 && mEntries != null ? mEntries[index] : null;
    }

    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 int getValueIndex() {
        return findIndexOfValue(mValue);
    }

    @Override
    protected boolean inScrollView() {
        return false;
    }

    @Override
    protected void onBindDialogView(View view) {
        // Empty
    }

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {

        mClickedDialogEntryIndex = getValueIndex();

        builder.setSingleChoiceItems(mEntries, mClickedDialogEntryIndex,
                new MaterialAlertDialog.OnClickListener() {
                    @Override
                    public boolean onClick(MaterialAlertDialog dialog, int which) {
                        mClickedDialogEntryIndex = which;
                        ListPreference.this.onClick(dialog, MaterialAlertDialog.POSITIVE);
                        return true;
                    }
                });
    }


    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);

        if (positiveResult && mClickedDialogEntryIndex >= 0 && mEntryValues != null) {
            String value = mEntryValues[mClickedDialogEntryIndex].toString();
            if (callChangeListener(value)) {
                setValue(value);
            }
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getString(index);
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setValue(restoreValue ? getPersistedString(mValue) : (String) 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 static class SavedState extends BaseSavedState {
        String value;

        public SavedState(Parcel source) {
            super(source);
            value = source.readString();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeString(value);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        @SuppressWarnings("unused")
        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}