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A library jar that provides APIs for Applications written for the Google Android Platform.

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/*
 * Copyright (C) 2011 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 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;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

/**
 * @hide
 */
public class SeekBarPreference extends Preference
        implements OnSeekBarChangeListener {

    private int mProgress;
    private int mMax;
    private boolean mTrackingTouch;

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

        TypedArray a = context.obtainStyledAttributes(
                attrs, com.android.internal.R.styleable.ProgressBar, defStyleAttr, defStyleRes);
        setMax(a.getInt(com.android.internal.R.styleable.ProgressBar_max, mMax));
        a.recycle();

        a = context.obtainStyledAttributes(attrs,
                com.android.internal.R.styleable.SeekBarPreference, defStyleAttr, defStyleRes);
        final int layoutResId = a.getResourceId(
                com.android.internal.R.styleable.SeekBarPreference_layout,
                com.android.internal.R.layout.preference_widget_seekbar);
        a.recycle();

        setLayoutResource(layoutResId);
    }

    public SeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

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

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

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

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

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

    @Override
    protected Object 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;
    }

    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();
            }
        }
    }

    public int getProgress() {
        return mProgress;
    }

    /**
     * Persist the seekBar's progress value if callChangeListener
     * returns true, otherwise set the seekBar's progress to the stored value
     */
    void syncProgress(SeekBar seekBar) {
        int progress = seekBar.getProgress();
        if (progress != mProgress) {
            if (callChangeListener(progress)) {
                setProgress(progress, false);
            } else {
                seekBar.setProgress(mProgress);
            }
        }
    }

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

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

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

    @Override
    protected Parcelable onSaveInstanceState() {
        /*
         * Suppose a client uses this preference type without persisting. We
         * must save the instance state so it is able to, for example, survive
         * orientation changes.
         */

        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            // No need to save instance state since it's persistent
            return superState;
        }

        // Save the instance state
        final SavedState myState = new SavedState(superState);
        myState.progress = mProgress;
        myState.max = mMax;
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!state.getClass().equals(SavedState.class)) {
            // Didn't save state for us in onSaveInstanceState
            super.onRestoreInstanceState(state);
            return;
        }

        // Restore the instance state
        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        mProgress = myState.progress;
        mMax = myState.max;
        notifyChanged();
    }

    /**
     * SavedState, a subclass of {@link BaseSavedState}, will store the state
     * of MyPreference, a subclass of Preference.
     * 

* It is important to always call through to super methods. */ private static class SavedState extends BaseSavedState { int progress; int max; public SavedState(Parcel source) { super(source); // Restore the click counter progress = source.readInt(); max = source.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); // Save the click counter dest.writeInt(progress); dest.writeInt(max); } public SavedState(Parcelable superState) { super(superState); } @SuppressWarnings("unused") public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { public SavedState createFromParcel(Parcel in) { return new SavedState(in); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; } }





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