Android Open Source - voicesmith Interval Picker

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Back to project page voicesmith.
License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Voicesmith <http://voicesmith.jurihock.de/>
 *//from   w  w w .jav a  2 s.  co m
 * Copyright (c) 2011-2014 Juergen Hock
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.jurihock.voicesmith.widgets;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.LayerDrawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import de.jurihock.voicesmith.R;

public final class IntervalPicker extends LinearLayout implements
  OnSeekBarChangeListener
{
  private final int        MAX_SEMITONES  = 24;
  private int            interval;

  private TextView        viewSeekLabel  = null;
  private SeekBar          viewSeekBar    = null;

  private PropertyChangeListener  listener    = null;

  /**
   * Returns the selected interval from -12 to 12 semitones.
   * */
  public int getInterval()
  {
    return interval;
  }

  public void setInterval(int interval)
  {
    if (this.interval == interval) return;

    this.interval = interval;

    // Update widgets
    viewSeekBar.setProgress(interval + MAX_SEMITONES / 2);
  }

  public void setPropertyChangeListener(PropertyChangeListener listener)
  {
    this.listener = listener;
  }

  public IntervalPicker(Context context, AttributeSet attrs)
  {
    super(context, attrs);
    initWidgets(context);
  }

  public IntervalPicker(Context context)
  {
    super(context);
    initWidgets(context);
  }

  private void initWidgets(Context context)
  {
    // Inflate layout
    View.inflate(context, R.layout.intervalpicker, this);

    // Find widgets
    viewSeekLabel = (TextView) findViewById(R.id.viewSeekLabel);
    viewSeekBar = (SeekBar) findViewById(R.id.viewSeekBar);

    // Set listeners
    viewSeekBar.setOnSeekBarChangeListener(this);

    // Disable the SeekBar progress gauge
    LayerDrawable d = (LayerDrawable)
      viewSeekBar.getProgressDrawable();
    d.setDrawableByLayerId(android.R.id.progress,
      new ColorDrawable(android.R.color.transparent));

    // Set SeekBar values
    viewSeekBar.setMax(MAX_SEMITONES);
    viewSeekBar.setSecondaryProgress(MAX_SEMITONES);
    viewSeekBar.setProgress(MAX_SEMITONES / 2);
  }

  /**
   * Updates the SeekBar label text.
   * */
  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
  {
    interval = progress - MAX_SEMITONES / 2;

    String text = String.format(viewSeekLabel.getTag().toString(),
      (interval > 0) ? "+" + interval : "" + interval);

    viewSeekLabel.setText(text);
  }

  /**
   * Notify the event subscriber.
   * */
  public void onStopTrackingTouch(SeekBar seekBar)
  {
    if (listener != null)
    {
      listener.propertyChange(new PropertyChangeEvent(
        this, "interval", null, interval));
    }
  }

  public void onStartTrackingTouch(SeekBar seekBar)
  {
    // Not important function
  }
}
Java Source Code List
