Android Open Source - PatternAndroid Flip Loading Layout

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Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.//  w w  w.  j a va  2  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.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
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;

@SuppressLint("ViewConstructor")
public class FlipLoadingLayout extends LoadingLayout {

  static final int FLIP_ANIMATION_DURATION = 150;

  private final Animation mRotateAnimation, mResetRotateAnimation;

  public FlipLoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {
    super(context, mode, scrollDirection, attrs);

    final int rotateAngle = mode == Mode.PULL_FROM_START ? -180 : 180;

    mRotateAnimation = new RotateAnimation(0, rotateAngle, Animation.RELATIVE_TO_SELF, 0.5f,
        Animation.RELATIVE_TO_SELF, 0.5f);
    mRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
    mRotateAnimation.setDuration(FLIP_ANIMATION_DURATION);
    mRotateAnimation.setFillAfter(true);

    mResetRotateAnimation = new RotateAnimation(rotateAngle, 0, Animation.RELATIVE_TO_SELF, 0.5f,
        Animation.RELATIVE_TO_SELF, 0.5f);
    mResetRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
    mResetRotateAnimation.setDuration(FLIP_ANIMATION_DURATION);
    mResetRotateAnimation.setFillAfter(true);
  }

  @Override
  protected void onLoadingDrawableSet(Drawable imageDrawable) {
    if (null != imageDrawable) {
      final int dHeight = imageDrawable.getIntrinsicHeight();
      final int dWidth = imageDrawable.getIntrinsicWidth();

      /**
       * We need to set the width/height of the ImageView so that it is
       * square with each side the size of the largest drawable dimension.
       * This is so that it doesn't clip when rotated.
       */
      ViewGroup.LayoutParams lp = mHeaderImage.getLayoutParams();
      lp.width = lp.height = Math.max(dHeight, dWidth);
      mHeaderImage.requestLayout();

      /**
       * We now rotate the Drawable so that is at the correct rotation,
       * and is centered.
       */
      mHeaderImage.setScaleType(ScaleType.MATRIX);
      Matrix matrix = new Matrix();
      matrix.postTranslate((lp.width - dWidth) / 2f, (lp.height - dHeight) / 2f);
      matrix.postRotate(getDrawableRotationAngle(), lp.width / 2f, lp.height / 2f);
      mHeaderImage.setImageMatrix(matrix);
    }
  }

  @Override
  protected void onPullImpl(float scaleOfLayout) {
    // NO-OP
  }

  @Override
  protected void pullToRefreshImpl() {
    // Only start reset Animation, we've previously show the rotate anim
    if (mRotateAnimation == mHeaderImage.getAnimation()) {
      mHeaderImage.startAnimation(mResetRotateAnimation);
    }
  }

  @Override
  protected void refreshingImpl() {
    mHeaderImage.clearAnimation();
    mHeaderImage.setVisibility(View.INVISIBLE);
    mHeaderProgress.setVisibility(View.VISIBLE);
  }

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

  @Override
  protected void resetImpl() {
    mHeaderImage.clearAnimation();
    mHeaderProgress.setVisibility(View.GONE);
    mHeaderImage.setVisibility(View.VISIBLE);
  }

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

  private float getDrawableRotationAngle() {
    float angle = 0f;
    switch (mMode) {
      case PULL_FROM_END:
        if (mScrollDirection == Orientation.HORIZONTAL) {
          angle = 90f;
        } else {
          angle = 180f;
        }
        break;

      case PULL_FROM_START:
        if (mScrollDirection == Orientation.HORIZONTAL) {
          angle = 270f;
        }
        break;

      default:
        break;
    }

    return angle;
  }

}
Java Source Code List
