SeekBarPreference.java

/*
 * Tint Browser for Android
 * 
 * Copyright (C) 2012 - to infinity and beyond J. Devauchelle and contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 3 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package com.seal.ui.preferences;

import android.content.Context;
import android.content.res.TypedArray;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TextView;

import com.seal.R;

public class SeekBarPreference extends Preference implements SeekBar.OnSeekBarChangeListener {

	private int mDefaultValue;
	private int mMinValue;
	private int mMaxValue;
	private int mStepValue;

	private String mSymbol;

	private TextView mTitle;
	private TextView mSummary;
	private TextView mValue;
	private SeekBar mSeekBar;

	public SeekBarPreference(Context context, AttributeSet attrs) {
		super(context, attrs);

		if (attrs != null) {
			TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.SeekBarPreference);

			mMinValue = a.getInt(R.styleable.SeekBarPreference_minValue, 0);
			mMaxValue = a.getInt(R.styleable.SeekBarPreference_maxValue, 10);
			mStepValue = a.getInt(R.styleable.SeekBarPreference_stepValue, 1);

			if (mMaxValue <= mMinValue) {
				mMaxValue = mMinValue + 1;
			}

			if (mDefaultValue < mMinValue) {
				mDefaultValue = mMinValue;
			}

			if (mStepValue <= 0) {
				mStepValue = 1;
			}

			mMinValue = Math.round(mMinValue / mStepValue);
			mMaxValue = Math.round(mMaxValue / mStepValue);

			mDefaultValue = a.getInt(R.styleable.SeekBarPreference_android_defaultValue, 0);

			mSymbol = a.getString(R.styleable.SeekBarPreference_symbol);

			a.recycle();
		}
	}

	@Override
	protected View onCreateView(ViewGroup parent) {
		LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		View v = inflater.inflate(R.layout.seekbar_preference, null);

		mTitle = (TextView) v.findViewById(R.id.SeekBarPreferenceTitle);
		mTitle.setText(getTitle());

		mSummary = (TextView) v.findViewById(R.id.SeekBarPreferenceSummary);
		if (!TextUtils.isEmpty(getSummary())) {
			mSummary.setText(getSummary());
		} else {
			mSummary.setVisibility(View.GONE);
		}

		mValue = (TextView) v.findViewById(R.id.SeekBarPreferenceValue);

		mSeekBar = (SeekBar) v.findViewById(R.id.SeekBarPreferenceSeekBar);
		mSeekBar.setMax(mMaxValue - mMinValue);

		int currentValue = getBoundedValue(PreferenceManager.getDefaultSharedPreferences(getContext()).getInt(getKey(), mDefaultValue));
		currentValue = currentValue - mMinValue;

		mSeekBar.setProgress(currentValue);
		updateValue(currentValue, false);
		mSeekBar.setOnSeekBarChangeListener(this);

		return v;
	}

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
		updateValue(progress, true);
	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
	}

	private int getBoundedValue(int value) {

		value = Math.round(value / mStepValue);

		if (value < mMinValue) {
			value = mMinValue;
		}

		if (value > mMaxValue) {
			value = mMaxValue;
		}

		return value;
	}

	private void updateValue(int value, boolean save) {

		value = (value + mMinValue) * mStepValue;

		mValue.setText(String.format("%s" + mSymbol, value));

		if (save) {
			PreferenceManager.getDefaultSharedPreferences(getContext()).edit().putInt(getKey(), value).commit();
		}
	}

}