ClearableEditText.java

/**
 * Copyright 2014 Alex Yanchenko
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package eu.se_bastiaan.popcorntimeremote.widget;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.view.View.OnTouchListener;
import android.widget.EditText;

import eu.se_bastiaan.popcorntimeremote.R;

/**
 * To change clear icon, set
 *
 * <pre>
 * android:drawableRight="@drawable/custom_icon"
 * </pre>
 */
public class ClearableEditText extends EditText implements OnTouchListener, OnFocusChangeListener {

    public interface Listener {
        void didClearText();
    }

    private Drawable xD;
    private Listener listener;
    private Boolean iconAlwaysVisible = false;

    private OnTouchListener l;
    private OnFocusChangeListener f;

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

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

    public ClearableEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }

    public void setIconAlwaysVisible(Boolean iconAlwaysVisible) {
        this.iconAlwaysVisible = iconAlwaysVisible;
        if(iconAlwaysVisible) setClearIconVisible(true);
    }

    @Override
    public void setOnTouchListener(OnTouchListener l) {
        this.l = l;
    }

    @Override
    public void setOnFocusChangeListener(OnFocusChangeListener f) {
        this.f = f;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (getCompoundDrawables()[2] != null) {
            boolean tappedX = event.getX() > (getWidth() - getPaddingRight() - xD
                    .getIntrinsicWidth());
            if (tappedX) {
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    setText("");
                    if (listener != null) {
                        listener.didClearText();
                    }
                }
                return true;
            }
        }
        if (l != null) {
            return l.onTouch(v, event);
        }
        return false;
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus && !getText().toString().equals("") || iconAlwaysVisible) {
            setClearIconVisible(true);
        } else {
            setClearIconVisible(false);
        }
        if (f != null) {
            f.onFocusChange(v, hasFocus);
        }
    }

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);

        if (isFocused() && !iconAlwaysVisible) {
            setClearIconVisible(!getText().toString().equals(""));
        }
    }

    private void init() {
        xD = getCompoundDrawables()[2];
        if (xD == null) {
            xD = getResources()
                    .getDrawable(R.drawable.abc_ic_clear_mtrl_alpha);
        }
        xD.setBounds(0, 0, xD.getIntrinsicWidth(), xD.getIntrinsicHeight());
        setClearIconVisible(false);
        super.setOnTouchListener(this);
        super.setOnFocusChangeListener(this);
    }

    protected void setClearIconVisible(boolean visible) {
        Drawable x = visible ? xD : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], x, getCompoundDrawables()[3]);
    }
}