package com.pedro.example;

import android.content.Context;
import android.support.constraint.ConstraintLayout;
import android.util.AttributeSet;
import android.util.Log;

/**
 * A common ConstraintLayout with a listener callback that notifies when the soft keyboard
 * is shown or hidden, as for now there is no such feature in the android framework
 */
public class SoftKeyboardAwareConstraintLayout extends ConstraintLayout {

    private SoftKeyboardVisibilityChangeListener callback;

    private boolean isKeyboardShown;


    public SoftKeyboardAwareConstraintLayout(Context context) {
        super(context);
    }

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

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


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if(callback != null) {
            final int proposedHeight = MeasureSpec.getSize(heightMeasureSpec);
            final int actualHeight = getHeight();

            if (actualHeight > proposedHeight) {
                if(!isKeyboardShown) {
                    Log.d("KEYBOARD_EVENTS", "Keyboard is shown");
                    callback.onSoftKeyboardShow();
                    isKeyboardShown = true;
                }
            } else {
                if(isKeyboardShown) {
                    Log.d("KEYBOARD_EVENTS", "Keyboard is hidden");
                    callback.onSoftKeyboardHide();
                    isKeyboardShown = false;
                }
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    public void setCallback(SoftKeyboardVisibilityChangeListener callback) {
        this.callback = callback;
    }


    public interface SoftKeyboardVisibilityChangeListener {
        void onSoftKeyboardShow();
        void onSoftKeyboardHide();
    }
}