OEViewHandler.java

/*
 * OpenERP, Open Source Management Solution
 * Copyright (C) 2012-today OpenERP SA (<http:www.openerp.com>)
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http:www.gnu.org/licenses/>
 * 
 */
package com.openerp.util;

import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.Transformation;

public class OEViewHandler {
	public static void expand(final View v) {

		v.measure(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
		final int targtetHeight = v.getMeasuredHeight();

		v.getLayoutParams().height = 0;
		v.setVisibility(View.VISIBLE);

		Animation a = new Animation() {
			@Override
			protected void applyTransformation(float interpolatedTime,
					Transformation t) {
				v.getLayoutParams().height = interpolatedTime == 1 ? LayoutParams.WRAP_CONTENT
						: (int) (targtetHeight * interpolatedTime);
				v.requestLayout();
			}

			@Override
			public boolean willChangeBounds() {
				return true;
			}
		};

		// 1dp/ms
		a.setDuration((int) (targtetHeight / v.getContext().getResources()
				.getDisplayMetrics().density));
		v.startAnimation(a);
	}

	public static void collapse(final View v) {
		final int initialHeight = v.getMeasuredHeight();

		Animation a = new Animation() {
			@Override
			protected void applyTransformation(float interpolatedTime,
					Transformation t) {
				if (interpolatedTime == 1) {
					v.setVisibility(View.GONE);
				} else {
					v.getLayoutParams().height = initialHeight
							- (int) (initialHeight * interpolatedTime);
					v.requestLayout();
				}
			}

			@Override
			public boolean willChangeBounds() {
				return true;
			}
		};

		// 1dp/ms
		a.setDuration((int) (initialHeight / v.getContext().getResources()
				.getDisplayMetrics().density));
		v.startAnimation(a);
	}
}