Android Open Source - android-pdfview Animation Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright 2014 Joan Zapata/*w ww  .  j a  va 2 s  . co  m*/
 *
 * This file is part of Android-pdfview.
 *
 * Android-pdfview 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.
 *
 * Android-pdfview 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 Android-pdfview.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.joanzapata.pdfview;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.graphics.PointF;
import android.view.animation.DecelerateInterpolator;

import com.joanzapata.pdfview.PDFView;

/**
 * @author Joan Zapata
 *         <p/>
 *         This manager is used by the PDFView to launch animations.
 *         It uses the ValueAnimator appeared in API 11 to start
 *         an animation, and call moveTo() on the PDFView as a result
 *         of each animation update.
 */
class AnimationManager {

    /** PDF View */
    private PDFView pdfView;

    private ValueAnimator animation;

    public AnimationManager(PDFView pdfView) {
        this.pdfView = pdfView;
    }

    public void startXAnimation(float xFrom, float xTo) {
        if (animation != null) {
            animation.cancel();
        }
        animation = ValueAnimator.ofFloat(xFrom, xTo);
        animation.setInterpolator(new DecelerateInterpolator());
        animation.addUpdateListener(new XAnimation());
        animation.setDuration(400);
        animation.start();
    }

    public void startZoomAnimation(float zoomFrom, float zoomTo) {
        if (animation != null) {
            animation.cancel();
        }
        animation = ValueAnimator.ofFloat(zoomFrom, zoomTo);
        animation.setInterpolator(new DecelerateInterpolator());
        ZoomAnimation zoomAnim = new ZoomAnimation();
        animation.addUpdateListener(zoomAnim);
        animation.addListener(zoomAnim);
        animation.setDuration(400);
        animation.start();
    }

    public void stopAll() {
        if (animation != null) {
            animation.cancel();
            animation = null;
        }
    }

    class XAnimation implements AnimatorUpdateListener {

        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            float offset = (Float) animation.getAnimatedValue();
            pdfView.moveTo(offset, pdfView.getCurrentYOffset());
        }

    }

    class ZoomAnimation implements AnimatorUpdateListener, AnimatorListener {

        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            float zoom = (Float) animation.getAnimatedValue();
            pdfView.zoomCenteredTo(zoom, new PointF(pdfView.getWidth() / 2, pdfView.getHeight() / 2));
        }

        @Override
        public void onAnimationCancel(Animator animation) {
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            pdfView.loadPages();
        }

        @Override
        public void onAnimationRepeat(Animator animation) {
        }

        @Override
        public void onAnimationStart(Animator animation) {
        }

    }

}

Java Source Code List

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