CustomFrameLayout.java

/*
 * Copyright (c) 2015, Nils Braden
 *
 * This file is part of ttrss-reader-fork. This program is free software; you
 * can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation;
 * either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details. You should have received a
 * copy of the GNU General Public License along with this program; If
 * not, see http://www.gnu.org/licenses/.
 */

package org.ttrssreader.gui.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;

/**
 * @author Pavel Dudka (http://trickyandroid.com/fragments-translate-animation/)
 */
public class CustomFrameLayout extends FrameLayout {

	private float xFraction = 0;

	private ViewTreeObserver.OnPreDrawListener preDrawListener = null;

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

	public void setXFraction(float fraction) {

		this.xFraction = fraction;

		if (getWidth() == 0) {
			if (preDrawListener == null) {
				preDrawListener = new ViewTreeObserver.OnPreDrawListener() {
					@Override
					public boolean onPreDraw() {
						getViewTreeObserver().removeOnPreDrawListener(preDrawListener);
						setXFraction(xFraction);
						return true;
					}
				};
				getViewTreeObserver().addOnPreDrawListener(preDrawListener);
			}
			return;
		}

		float translationX = getWidth() * fraction;
		setTranslationX(translationX);
	}

	public float getXFraction() {
		return this.xFraction;
	}

}