Android Open Source - Android-PullToRefresh-master Loading Layout

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Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes./*from  w  ww  . ja  va  2s  .c  o m*/
 *
 * 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.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

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

@SuppressLint("ViewConstructor")
public abstract class LoadingLayout extends FrameLayout implements ILoadingLayout {

  static final String LOG_TAG = "PullToRefresh-LoadingLayout";

  static final Interpolator ANIMATION_INTERPOLATOR = new LinearInterpolator();

  private FrameLayout mInnerLayout;

  protected final ImageView mHeaderImage;
  protected final ProgressBar mHeaderProgress;

  private boolean mUseIntrinsicAnimation;

  private final TextView mHeaderText;
  private final TextView mSubHeaderText;

  protected final Mode mMode;
  protected final Orientation mScrollDirection;

  private CharSequence mPullLabel;
  private CharSequence mRefreshingLabel;
  private CharSequence mReleaseLabel;

  public LoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {
    super(context);
    mMode = mode;
    mScrollDirection = scrollDirection;

    switch (scrollDirection) {
      case HORIZONTAL:
        LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_horizontal, this);
        break;
      case VERTICAL:
      default:
        LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_vertical, this);
        break;
    }

    mInnerLayout = (FrameLayout) findViewById(R.id.fl_inner);
    mHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_text);
    mHeaderProgress = (ProgressBar) mInnerLayout.findViewById(R.id.pull_to_refresh_progress);
    mSubHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_sub_text);
    mHeaderImage = (ImageView) mInnerLayout.findViewById(R.id.pull_to_refresh_image);

    FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mInnerLayout.getLayoutParams();

    switch (mode) {
      case PULL_FROM_END:
        lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.TOP : Gravity.LEFT;

        // Load in labels
        mPullLabel = context.getString(R.string.pull_to_refresh_from_bottom_pull_label);
        mRefreshingLabel = context.getString(R.string.pull_to_refresh_from_bottom_refreshing_label);
        mReleaseLabel = context.getString(R.string.pull_to_refresh_from_bottom_release_label);
        break;

      case PULL_FROM_START:
      default:
        lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.BOTTOM : Gravity.RIGHT;

        // Load in labels
        mPullLabel = context.getString(R.string.pull_to_refresh_pull_label);
        mRefreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label);
        mReleaseLabel = context.getString(R.string.pull_to_refresh_release_label);
        break;
    }

    if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderBackground)) {
      Drawable background = attrs.getDrawable(R.styleable.PullToRefresh_ptrHeaderBackground);
      if (null != background) {
        ViewCompat.setBackground(this, background);
      }
    }

    if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance)) {
      TypedValue styleID = new TypedValue();
      attrs.getValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance, styleID);
      setTextAppearance(styleID.data);
    }
    if (attrs.hasValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance)) {
      TypedValue styleID = new TypedValue();
      attrs.getValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance, styleID);
      setSubTextAppearance(styleID.data);
    }

    // Text Color attrs need to be set after TextAppearance attrs
    if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextColor)) {
      ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderTextColor);
      if (null != colors) {
        setTextColor(colors);
      }
    }
    if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderSubTextColor)) {
      ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderSubTextColor);
      if (null != colors) {
        setSubTextColor(colors);
      }
    }

    // Try and get defined drawable from Attrs
    Drawable imageDrawable = null;
    if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawable)) {
      imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawable);
    }

    // Check Specific Drawable from Attrs, these overrite the generic
    // drawable attr above
    switch (mode) {
      case PULL_FROM_START:
      default:
        if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableStart)) {
          imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableStart);
        } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableTop)) {
          Utils.warnDeprecation("ptrDrawableTop", "ptrDrawableStart");
          imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableTop);
        }
        break;

      case PULL_FROM_END:
        if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableEnd)) {
          imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableEnd);
        } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableBottom)) {
          Utils.warnDeprecation("ptrDrawableBottom", "ptrDrawableEnd");
          imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableBottom);
        }
        break;
    }

    // If we don't have a user defined drawable, load the default
    if (null == imageDrawable) {
      imageDrawable = context.getResources().getDrawable(getDefaultDrawableResId());
    }

    // Set Drawable, and save width/height
    setLoadingDrawable(imageDrawable);

    reset();
  }

  public final void setHeight(int height) {
    ViewGroup.LayoutParams lp = (ViewGroup.LayoutParams) getLayoutParams();
    lp.height = height;
    requestLayout();
  }

  public final void setWidth(int width) {
    ViewGroup.LayoutParams lp = (ViewGroup.LayoutParams) getLayoutParams();
    lp.width = width;
    requestLayout();
  }

  public final int getContentSize() {
    switch (mScrollDirection) {
      case HORIZONTAL:
        return mInnerLayout.getWidth();
      case VERTICAL:
      default:
        return mInnerLayout.getHeight();
    }
  }

  public final void hideAllViews() {
    if (View.VISIBLE == mHeaderText.getVisibility()) {
      mHeaderText.setVisibility(View.INVISIBLE);
    }
    if (View.VISIBLE == mHeaderProgress.getVisibility()) {
      mHeaderProgress.setVisibility(View.INVISIBLE);
    }
    if (View.VISIBLE == mHeaderImage.getVisibility()) {
      mHeaderImage.setVisibility(View.INVISIBLE);
    }
    if (View.VISIBLE == mSubHeaderText.getVisibility()) {
      mSubHeaderText.setVisibility(View.INVISIBLE);
    }
  }

  public final void onPull(float scaleOfLayout) {
    if (!mUseIntrinsicAnimation) {
      onPullImpl(scaleOfLayout);
    }
  }

  public final void pullToRefresh() {
    if (null != mHeaderText) {
      mHeaderText.setText(mPullLabel);
    }

    // Now call the callback
    pullToRefreshImpl();
  }

  public final void refreshing() {
    if (null != mHeaderText) {
      mHeaderText.setText(mRefreshingLabel);
    }

    if (mUseIntrinsicAnimation) {
      ((AnimationDrawable) mHeaderImage.getDrawable()).start();
    } else {
      // Now call the callback
      refreshingImpl();
    }

    if (null != mSubHeaderText) {
      mSubHeaderText.setVisibility(View.GONE);
    }
  }

  public final void releaseToRefresh() {
    if (null != mHeaderText) {
      mHeaderText.setText(mReleaseLabel);
    }

    // Now call the callback
    releaseToRefreshImpl();
  }

  public final void reset() {
    if (null != mHeaderText) {
      mHeaderText.setText(mPullLabel);
    }
    mHeaderImage.setVisibility(View.VISIBLE);

    if (mUseIntrinsicAnimation) {
      ((AnimationDrawable) mHeaderImage.getDrawable()).stop();
    } else {
      // Now call the callback
      resetImpl();
    }

    if (null != mSubHeaderText) {
      if (TextUtils.isEmpty(mSubHeaderText.getText())) {
        mSubHeaderText.setVisibility(View.GONE);
      } else {
        mSubHeaderText.setVisibility(View.VISIBLE);
      }
    }
  }

  @Override
  public void setLastUpdatedLabel(CharSequence label) {
    setSubHeaderText(label);
  }

  public final void setLoadingDrawable(Drawable imageDrawable) {
    // Set Drawable
    mHeaderImage.setImageDrawable(imageDrawable);
    mUseIntrinsicAnimation = (imageDrawable instanceof AnimationDrawable);

    // Now call the callback
    onLoadingDrawableSet(imageDrawable);
  }

  public void setPullLabel(CharSequence pullLabel) {
    mPullLabel = pullLabel;
  }

  public void setRefreshingLabel(CharSequence refreshingLabel) {
    mRefreshingLabel = refreshingLabel;
  }

  public void setReleaseLabel(CharSequence releaseLabel) {
    mReleaseLabel = releaseLabel;
  }

  @Override
  public void setTextTypeface(Typeface tf) {
    mHeaderText.setTypeface(tf);
  }

  public final void showInvisibleViews() {
    if (View.INVISIBLE == mHeaderText.getVisibility()) {
      mHeaderText.setVisibility(View.VISIBLE);
    }
    if (View.INVISIBLE == mHeaderProgress.getVisibility()) {
      mHeaderProgress.setVisibility(View.VISIBLE);
    }
    if (View.INVISIBLE == mHeaderImage.getVisibility()) {
      mHeaderImage.setVisibility(View.VISIBLE);
    }
    if (View.INVISIBLE == mSubHeaderText.getVisibility()) {
      mSubHeaderText.setVisibility(View.VISIBLE);
    }
  }

  /**
   * Callbacks for derivative Layouts
   */

  protected abstract int getDefaultDrawableResId();

  protected abstract void onLoadingDrawableSet(Drawable imageDrawable);

  protected abstract void onPullImpl(float scaleOfLayout);

  protected abstract void pullToRefreshImpl();

  protected abstract void refreshingImpl();

  protected abstract void releaseToRefreshImpl();

  protected abstract void resetImpl();

  private void setSubHeaderText(CharSequence label) {
    if (null != mSubHeaderText) {
      if (TextUtils.isEmpty(label)) {
        mSubHeaderText.setVisibility(View.GONE);
      } else {
        mSubHeaderText.setText(label);

        // Only set it to Visible if we're GONE, otherwise VISIBLE will
        // be set soon
        if (View.GONE == mSubHeaderText.getVisibility()) {
          mSubHeaderText.setVisibility(View.VISIBLE);
        }
      }
    }
  }

  private void setSubTextAppearance(int value) {
    if (null != mSubHeaderText) {
      mSubHeaderText.setTextAppearance(getContext(), value);
    }
  }

  private void setSubTextColor(ColorStateList color) {
    if (null != mSubHeaderText) {
      mSubHeaderText.setTextColor(color);
    }
  }

  private void setTextAppearance(int value) {
    if (null != mHeaderText) {
      mHeaderText.setTextAppearance(getContext(), value);
    }
    if (null != mSubHeaderText) {
      mSubHeaderText.setTextAppearance(getContext(), value);
    }
  }

  private void setTextColor(ColorStateList color) {
    if (null != mHeaderText) {
      mHeaderText.setTextColor(color);
    }
    if (null != mSubHeaderText) {
      mSubHeaderText.setTextColor(color);
    }
  }

}
Java Source Code List
