SeekBarPreference.java

package org.holoeverywhere.preference;

import org.holoeverywhere.widget.SeekBar;
import org.holoeverywhere.widget.SeekBar.OnSeekBarChangeListener;

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

public class SeekBarPreference extends Preference implements
        OnSeekBarChangeListener {
    private static class SavedState extends BaseSavedState {
        int max;
        int progress;

        public SavedState(Parcel source) {
            super(source);
            progress = source.readInt();
            max = source.readInt();
        }

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

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(progress);
            dest.writeInt(max);
        }
    }

    private int mMax;
    private int mProgress;

    private boolean mTrackingTouch;

    public SeekBarPreference(Context context) {
        this(context, null);
    }

    public SeekBarPreference(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.seekBarPreferenceStyle);
    }

    public SeekBarPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        context = getContext();
        TypedArray a = context.obtainStyledAttributes(attrs,
                R.styleable.SeekBarPreference, defStyle, 0);
        setMax(a.getInt(R.styleable.SeekBarPreference_max, mMax));
        a.recycle();
    }

    public int getProgress() {
        return mProgress;
    }

    @Override
    public CharSequence getSummary() {
        return null;
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekbar);
        seekBar.setOnSeekBarChangeListener(this);
        seekBar.setMax(mMax);
        seekBar.setProgress(mProgress);
        seekBar.setEnabled(isEnabled());
    }

    @Override
    protected Integer onGetDefaultValue(TypedArray a, int index) {
        return a.getInt(index, 0);
    }

    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (event.getAction() != KeyEvent.ACTION_UP) {
            if (keyCode == KeyEvent.KEYCODE_PLUS
                    || keyCode == KeyEvent.KEYCODE_EQUALS) {
                setProgress(getProgress() + 1);
                return true;
            }
            if (keyCode == KeyEvent.KEYCODE_MINUS) {
                setProgress(getProgress() - 1);
                return true;
            }
        }
        return false;
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        if (fromUser && !mTrackingTouch) {
            syncProgress(seekBar);
        }
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!state.getClass().equals(SavedState.class)) {
            super.onRestoreInstanceState(state);
            return;
        }
        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        mProgress = myState.progress;
        mMax = myState.max;
        notifyChanged();
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            return superState;
        }
        final SavedState myState = new SavedState(superState);
        myState.progress = mProgress;
        myState.max = mMax;
        return myState;
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setProgress(restoreValue ? getPersistedInt(mProgress)
                : (Integer) defaultValue);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        mTrackingTouch = true;
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        mTrackingTouch = false;
        if (seekBar.getProgress() != mProgress) {
            syncProgress(seekBar);
        }
    }

    public void setMax(int max) {
        if (max != mMax) {
            mMax = max;
            notifyChanged();
        }
    }

    public void setProgress(int progress) {
        setProgress(progress, true);
    }

    private void setProgress(int progress, boolean notifyChanged) {
        if (progress > mMax) {
            progress = mMax;
        }
        if (progress < 0) {
            progress = 0;
        }
        if (progress != mProgress) {
            mProgress = progress;
            persistInt(progress);
            if (notifyChanged) {
                notifyChanged();
            }
        }
    }

    void syncProgress(SeekBar seekBar) {
        int progress = seekBar.getProgress();
        if (progress != mProgress) {
            if (callChangeListener(progress)) {
                setProgress(progress, false);
            } else {
                seekBar.setProgress(mProgress);
            }
        }
    }
}