Android Open Source - Android-PullToRefreshWithProgressBar Rotate Loading Layout

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License

The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.// ww w  .  j a  v a2  s  .  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.content.Context;
import android.content.res.TypedArray;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView.ScaleType;

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

public class RotateLoadingLayout extends LoadingLayout {

  static final int ROTATION_ANIMATION_DURATION = 1200;

  private final Animation mRotateAnimation;
  private final Matrix mHeaderImageMatrix;

  private float mRotationPivotX, mRotationPivotY;

  private final boolean mRotateDrawableWhilePulling;

  public RotateLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {
    super(context, mode, scrollDirection, attrs, null);

    mRotateDrawableWhilePulling = attrs.getBoolean(R.styleable.PullToRefresh_ptrRotateDrawableWhilePulling, true);

    mHeaderImage.setScaleType(ScaleType.MATRIX);
    mHeaderImageMatrix = new Matrix();
    mHeaderImage.setImageMatrix(mHeaderImageMatrix);

    mRotateAnimation = new RotateAnimation(0, 720, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
        0.5f);
    mRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
    mRotateAnimation.setDuration(ROTATION_ANIMATION_DURATION);
    mRotateAnimation.setRepeatCount(Animation.INFINITE);
    mRotateAnimation.setRepeatMode(Animation.RESTART);
  }

  public void onLoadingDrawableSet(Drawable imageDrawable) {
    if (null != imageDrawable) {
      mRotationPivotX = Math.round(imageDrawable.getIntrinsicWidth() / 2f);
      mRotationPivotY = Math.round(imageDrawable.getIntrinsicHeight() / 2f);
    }
  }

  protected void onPullImpl(float scaleOfLayout) {
    float angle;
    if (mRotateDrawableWhilePulling) {
      angle = scaleOfLayout * 90f;
    } else {
      angle = Math.max(0f, Math.min(180f, scaleOfLayout * 360f - 180f));
    }

    mHeaderImageMatrix.setRotate(angle, mRotationPivotX, mRotationPivotY);
    mHeaderImage.setImageMatrix(mHeaderImageMatrix);
  }

  @Override
  protected void refreshingImpl() {
    mHeaderImage.startAnimation(mRotateAnimation);
  }

  @Override
  protected void resetImpl() {
    mHeaderImage.clearAnimation();
    resetImageRotation();
  }

  private void resetImageRotation() {
    if (null != mHeaderImageMatrix) {
      mHeaderImageMatrix.reset();
      mHeaderImage.setImageMatrix(mHeaderImageMatrix);
    }
  }

  @Override
  protected void pullToRefreshImpl() {
    // NO-OP
  }

  @Override
  protected void releaseToRefreshImpl() {
    // NO-OP
  }

  @Override
  protected int getDefaultDrawableResId() {
    return R.drawable.default_ptr_rotate;
  }

}

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