Android Open Source - Android-PullToRefresh-master Indicator Layout

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes./*  w  w  w  .  j ava2s  .c om*/
 *
 * 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 com.handmark.pulltorefresh.library.internal;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.R;

@SuppressLint("ViewConstructor")
public class IndicatorLayout extends FrameLayout implements AnimationListener {

  static final int DEFAULT_ROTATION_ANIMATION_DURATION = 150;

  private Animation mInAnim, mOutAnim;
  private ImageView mArrowImageView;

  private final Animation mRotateAnimation, mResetRotateAnimation;

  public IndicatorLayout(Context context, PullToRefreshBase.Mode mode) {
    super(context);
    mArrowImageView = new ImageView(context);

    Drawable arrowD = getResources().getDrawable(R.drawable.indicator_arrow);
    mArrowImageView.setImageDrawable(arrowD);

    final int padding = getResources().getDimensionPixelSize(R.dimen.indicator_internal_padding);
    mArrowImageView.setPadding(padding, padding, padding, padding);
    addView(mArrowImageView);

    int inAnimResId, outAnimResId;
    switch (mode) {
      case PULL_FROM_END:
        inAnimResId = R.anim.slide_in_from_bottom;
        outAnimResId = R.anim.slide_out_to_bottom;
        setBackgroundResource(R.drawable.indicator_bg_bottom);

        // Rotate Arrow so it's pointing the correct way
        mArrowImageView.setScaleType(ScaleType.MATRIX);
        Matrix matrix = new Matrix();
        matrix.setRotate(180f, arrowD.getIntrinsicWidth() / 2f, arrowD.getIntrinsicHeight() / 2f);
        mArrowImageView.setImageMatrix(matrix);
        break;
      default:
      case PULL_FROM_START:
        inAnimResId = R.anim.slide_in_from_top;
        outAnimResId = R.anim.slide_out_to_top;
        setBackgroundResource(R.drawable.indicator_bg_top);
        break;
    }

    mInAnim = AnimationUtils.loadAnimation(context, inAnimResId);
    mInAnim.setAnimationListener(this);

    mOutAnim = AnimationUtils.loadAnimation(context, outAnimResId);
    mOutAnim.setAnimationListener(this);

    final Interpolator interpolator = new LinearInterpolator();
    mRotateAnimation = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
        0.5f);
    mRotateAnimation.setInterpolator(interpolator);
    mRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
    mRotateAnimation.setFillAfter(true);

    mResetRotateAnimation = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF, 0.5f,
        Animation.RELATIVE_TO_SELF, 0.5f);
    mResetRotateAnimation.setInterpolator(interpolator);
    mResetRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
    mResetRotateAnimation.setFillAfter(true);

  }

  public final boolean isVisible() {
    Animation currentAnim = getAnimation();
    if (null != currentAnim) {
      return mInAnim == currentAnim;
    }

    return getVisibility() == View.VISIBLE;
  }

  public void hide() {
    startAnimation(mOutAnim);
  }

  public void show() {
    mArrowImageView.clearAnimation();
    startAnimation(mInAnim);
  }

  @Override
  public void onAnimationEnd(Animation animation) {
    if (animation == mOutAnim) {
      mArrowImageView.clearAnimation();
      setVisibility(View.GONE);
    } else if (animation == mInAnim) {
      setVisibility(View.VISIBLE);
    }

    clearAnimation();
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
    // NO-OP
  }

  @Override
  public void onAnimationStart(Animation animation) {
    setVisibility(View.VISIBLE);
  }

  public void releaseToRefresh() {
    mArrowImageView.startAnimation(mRotateAnimation);
  }

  public void pullToRefresh() {
    mArrowImageView.startAnimation(mResetRotateAnimation);
  }

}

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