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package github.ankushsachdeva.emojicon;
import android.os.Handler;
import android.os.SystemClock;
import android.view.MotionEvent;
import android.view.View;
/**
* A class, that can be used as a TouchListener on any view (e.g. a Button).
* It cyclically runs a clickListener, emulating keyboard-like behaviour. First
* click is fired immediately, next before initialInterval, and subsequent before
* normalInterval.
* <p/>
* <p>Interval is scheduled before the onClick completes, so it has to run fast.
* If it runs slow, it does not generate skipped onClicks.
*/
class RepeatTouchListener implements View.OnTouchListener {
private Handler handler = new Handler();
private int initialInterval;
private final int normalInterval;
private final View.OnClickListener clickListener;
private Runnable handlerRunnable = new Runnable() {
@Override
public void run() {
if (downView == null) {
return;
}
handler.removeCallbacksAndMessages(downView);
handler.postAtTime(this, downView, SystemClock.uptimeMillis() + normalInterval);
clickListener.onClick(downView);
}
};
private View downView;
/**
* @param initialInterval The interval before first click event
* @param normalInterval The interval before second and subsequent click
* events
* @param clickListener The OnClickListener, that will be called
* periodically
*/
public RepeatTouchListener(int initialInterval, int normalInterval, View.OnClickListener clickListener) {
if (clickListener == null)
throw new IllegalArgumentException("null runnable");
if (initialInterval < 0 || normalInterval < 0)
throw new IllegalArgumentException("negative interval");
this.initialInterval = initialInterval;
this.normalInterval = normalInterval;
this.clickListener = clickListener;
}
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
downView = view;
handler.removeCallbacks(handlerRunnable);
handler.postAtTime(handlerRunnable, downView, SystemClock.uptimeMillis() + initialInterval);
clickListener.onClick(view);
return true;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_OUTSIDE:
handler.removeCallbacksAndMessages(downView);
downView = null;
return true;
}
return false;
}
}
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