import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

import com.ybzf.mobile.pharmacist.R;

/**
 * Created by Lampo on 15/12/10.
 */
public class ClearEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {
    /**
     * 刪除按鈕的引用
     */
    private Drawable mClearDrawable;
    /**
     * 控制元件是否有焦點
     */
    private boolean hasFoucs;

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

    public ClearEditText(Context context, AttributeSet attrs) {
        super(context, attrs, android.R.attr.editTextStyle);
    }

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

    private void init() {
        //獲取EditText的DrawableRight,假如沒有設定我們就使用預設的圖片
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
//         throw new NullPointerException("You can add drawableRight attribute in XML");
            mClearDrawable = getResources().getDrawable(R.mipmap.delete);
        }
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
        //預設設定隱藏圖示
        setClearIconVisible(false);
        setOnFocusChangeListener(this);
        addTextChangedListener(this);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            if (getCompoundDrawables()[2] != null) {
                boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
                        && (event.getX() < (getWidth() - getPaddingRight()));

                if (touchable) {
                    this.setText("");
                }
            }
        }
        return super.onTouchEvent(event);
    }


    /**
     * 設定清除圖示的顯示與隱藏，呼叫setCompoundDrawables為EditText繪製上去
     *
     * @param visible
     */
    protected void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }


    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        this.hasFoucs = hasFocus;
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }

    @Override
    public void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        if (hasFoucs) {
            setClearIconVisible(text.length() > 0);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void afterTextChanged(Editable s) {

    }
}