AnimationUtil.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime.util;
 
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
 
public final class AnimationUtil {
 
  private AnimationUtil() {
  }
 
  /*
   * Animates a component moving it horizontally.
   */
  private static void ApplyHorizontalScrollAnimation(View view, boolean left, int speed) {
    float sign = left ? 1f : -1f;
    AnimationSet animationSet = new AnimationSet(true);
    animationSet.setRepeatCount(Animation.INFINITE);
    animationSet.setRepeatMode(Animation.RESTART);
 
    TranslateAnimation move = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, sign * 0.70f,
        Animation.RELATIVE_TO_PARENT, sign * -0.70f, Animation.RELATIVE_TO_PARENT, 0,
        Animation.RELATIVE_TO_PARENT, 0);
    move.setStartOffset(0);
    move.setDuration(speed);
    move.setFillAfter(true);
    animationSet.addAnimation(move);
    view.startAnimation(animationSet);
  }
 
  public static void ApplyAnimation(View view, String animation) {
    // TODO(user): These string constants need to be extracted and defined somewhere else!
    // TODO(user): Also, the endless else-if is inefficient
    if (animation.equals("ScrollRightSlow")) {
      ApplyHorizontalScrollAnimation(view, false, 8000);
    } else if (animation.equals("ScrollRight")) {
      ApplyHorizontalScrollAnimation(view, false, 4000);
    } else if (animation.equals("ScrollRightFast")) {
      ApplyHorizontalScrollAnimation(view, false, 1000);
    } else if (animation.equals("ScrollLeftSlow")) {
      ApplyHorizontalScrollAnimation(view, true, 8000);
    } else if (animation.equals("ScrollLeft")) {
      ApplyHorizontalScrollAnimation(view, true, 4000);
    } else if (animation.equals("ScrollLeftFast")) {
      ApplyHorizontalScrollAnimation(view, true, 1000);
    } else if (animation.equals("Stop")) {
      view.clearAnimation();
    }
  }
 
  public static void ApplyOpenScreenAnimation(Activity activity, String animType) {
    if (animType == null) {
      return;
    }
    if (SdkLevel.getLevel() <= SdkLevel.LEVEL_DONUT) {
      Log.e("AnimationUtil", "Screen animations are not available on android versions less than 2.0.");
      return;
    }
    int enter = 0;
    int exit = 0;
 
    if (animType.equalsIgnoreCase("fade")) {
      enter = activity.getResources().getIdentifier("fadein", "anim", activity.getPackageName());
      exit = activity.getResources().getIdentifier("hold", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("zoom")) {
      exit = activity.getResources().getIdentifier("zoom_exit", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("zoom_enter", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("slidehorizontal")) {
      exit = activity.getResources().getIdentifier("slide_exit", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("slide_enter", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("slidevertical")) {
      exit = activity.getResources().getIdentifier("slide_v_exit", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("slide_v_enter", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("none")) {
      // enter and exit are already set to 0, so
      // no animations will be played.
    } else {
      // Return here so overridePendingTransitions isn't run, and android
      // does it's default thing.
      return;
    }
    EclairUtil.overridePendingTransitions(activity, enter, exit);
  }
 
  public static void ApplyCloseScreenAnimation(Activity activity, String animType) {
    if (animType == null) {
      return;
    }
    if (SdkLevel.getLevel() <= SdkLevel.LEVEL_DONUT) {
      Log.e("AnimationUtil", "Screen animations are not available on android versions less than 2.0.");
      return;
    }
    int enter = 0;
    int exit = 0;
    if (animType.equalsIgnoreCase("fade")) {
      exit = activity.getResources().getIdentifier("fadeout", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("hold", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("zoom")) {
      exit = activity.getResources().getIdentifier("zoom_exit_reverse", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("zoom_enter_reverse", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("slidehorizontal")) {
      exit = activity.getResources().getIdentifier("slide_exit_reverse", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("slide_enter_reverse", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("slidevertical")) {
      exit = activity.getResources().getIdentifier("slide_v_exit_reverse", "anim", activity.getPackageName());
      enter = activity.getResources().getIdentifier("slide_v_enter_reverse", "anim", activity.getPackageName());
    } else if (animType.equalsIgnoreCase("none")) {
      // enter and exit are already set to 0, so
      // no animations will be played.
    } else {
      // Return here so overridePendingTransitions isn't run, and android
      // does it's default thing.
      return;
    }
    EclairUtil.overridePendingTransitions(activity, enter, exit);
  }
 
}