RepeatableImageKey.java

package org.thoughtcrime.SMP.components;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.HapticFeedbackConstants;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.ImageButton;

public class RepeatableImageKey extends ImageButton {

  private KeyEventListener listener;

  public RepeatableImageKey(Context context) {
    super(context);
    init();
  }

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

  public RepeatableImageKey(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  @TargetApi(VERSION_CODES.LOLLIPOP)
  public RepeatableImageKey(Context context, AttributeSet attrs, int defStyleAttr,
                            int defStyleRes)
  {
    super(context, attrs, defStyleAttr, defStyleRes);
    init();
  }

  private void init() {
    setOnClickListener(new RepeaterClickListener());
    setOnTouchListener(new RepeaterTouchListener());
  }

  public void setOnKeyEventListener(KeyEventListener listener) {
    this.listener = listener;
  }

  private void notifyListener() {
    if (this.listener != null) this.listener.onKeyEvent();
  }

  private class RepeaterClickListener implements OnClickListener {
    @Override public void onClick(View v) {
      notifyListener();
    }
  }

  private class Repeater implements Runnable {
    @TargetApi(VERSION_CODES.HONEYCOMB_MR1)
    @Override
    public void run() {
      notifyListener();
      postDelayed(this, VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB_MR1
                        ? ViewConfiguration.getKeyRepeatDelay()
                        : 50);
    }
  }

  private class RepeaterTouchListener implements OnTouchListener {
    private Repeater repeater;

    public RepeaterTouchListener() {
      this.repeater = new Repeater();
    }

    @TargetApi(VERSION_CODES.HONEYCOMB_MR1)
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
      switch (motionEvent.getAction()) {
      case MotionEvent.ACTION_DOWN:
        view.postDelayed(repeater, VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB_MR1
                                   ? ViewConfiguration.getKeyRepeatTimeout()
                                   : ViewConfiguration.getLongPressTimeout());
        performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP);
        return false;
      case MotionEvent.ACTION_CANCEL:
      case MotionEvent.ACTION_UP:
        view.removeCallbacks(repeater);
        return false;
      default:
        return false;
      }
    }
  }

  public interface KeyEventListener {
    void onKeyEvent();
  }
}