Android Open Source - friendica-for-android Pull To Refresh List View

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The source code is released under:
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.// ww  w.  j ava 2  s.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;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ListAdapter;
import android.widget.ListView;

import com.handmark.pulltorefresh.library.internal.EmptyViewMethodAccessor;
import com.handmark.pulltorefresh.library.internal.LoadingLayout;

public class PullToRefreshListView extends PullToRefreshAdapterViewBase<ListView> {

  private LoadingLayout mHeaderLoadingView;
  private LoadingLayout mFooterLoadingView;

  private FrameLayout mLvFooterLoadingFrame;

  public PullToRefreshListView(Context context) {
    super(context);
    setDisableScrollingWhileRefreshing(false);
  }

  public PullToRefreshListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setDisableScrollingWhileRefreshing(false);
  }

  public PullToRefreshListView(Context context, Mode mode) {
    super(context, mode);
    setDisableScrollingWhileRefreshing(false);
  }

  @Override
  public ContextMenuInfo getContextMenuInfo() {
    return ((InternalListView) getRefreshableView()).getContextMenuInfo();
  }

  public void setPullLabel(String pullLabel, Mode mode) {
    super.setPullLabel(pullLabel, mode);

    if (null != mHeaderLoadingView && mode.canPullDown()) {
      mHeaderLoadingView.setPullLabel(pullLabel);
    }
    if (null != mFooterLoadingView && mode.canPullUp()) {
      mFooterLoadingView.setPullLabel(pullLabel);
    }
  }

  public void setRefreshingLabel(String refreshingLabel, Mode mode) {
    super.setRefreshingLabel(refreshingLabel, mode);

    if (null != mHeaderLoadingView && mode.canPullDown()) {
      mHeaderLoadingView.setRefreshingLabel(refreshingLabel);
    }
    if (null != mFooterLoadingView && mode.canPullUp()) {
      mFooterLoadingView.setRefreshingLabel(refreshingLabel);
    }
  }

  public void setReleaseLabel(String releaseLabel, Mode mode) {
    super.setReleaseLabel(releaseLabel, mode);

    if (null != mHeaderLoadingView && mode.canPullDown()) {
      mHeaderLoadingView.setReleaseLabel(releaseLabel);
    }
    if (null != mFooterLoadingView && mode.canPullUp()) {
      mFooterLoadingView.setReleaseLabel(releaseLabel);
    }
  }

  @Override
  protected final ListView createRefreshableView(Context context, AttributeSet attrs) {
    ListView lv = new InternalListView(context, attrs);

    // Get Styles from attrs
    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PullToRefresh);

    // Create Loading Views ready for use later
    FrameLayout frame = new FrameLayout(context);
    mHeaderLoadingView = new LoadingLayout(context, Mode.PULL_DOWN_TO_REFRESH, a);
    frame.addView(mHeaderLoadingView, FrameLayout.LayoutParams.FILL_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT);
    mHeaderLoadingView.setVisibility(View.GONE);
    lv.addHeaderView(frame, null, false);

    mLvFooterLoadingFrame = new FrameLayout(context);
    mFooterLoadingView = new LoadingLayout(context, Mode.PULL_UP_TO_REFRESH, a);
    mLvFooterLoadingFrame.addView(mFooterLoadingView, FrameLayout.LayoutParams.FILL_PARENT,
        FrameLayout.LayoutParams.WRAP_CONTENT);
    mFooterLoadingView.setVisibility(View.GONE);

    a.recycle();

    // Set it to this so it can be used in ListActivity/ListFragment
    lv.setId(android.R.id.list);
    return lv;
  }

  protected int getNumberInternalFooterViews() {
    return null != mFooterLoadingView ? 1 : 0;
  }

  protected int getNumberInternalHeaderViews() {
    return null != mHeaderLoadingView ? 1 : 0;
  }

  @Override
  protected void resetHeader() {

    // If we're not showing the Refreshing view, or the list is empty, then
    // the header/footer views won't show so we use the
    // normal method
    ListAdapter adapter = mRefreshableView.getAdapter();
    if (!getShowViewWhileRefreshing() || null == adapter || adapter.isEmpty()) {
      super.resetHeader();
      return;
    }

    LoadingLayout originalLoadingLayout;
    LoadingLayout listViewLoadingLayout;

    int scrollToHeight = getHeaderHeight();
    int selection;
    boolean scroll;

    switch (getCurrentMode()) {
      case PULL_UP_TO_REFRESH:
        originalLoadingLayout = getFooterLayout();
        listViewLoadingLayout = mFooterLoadingView;
        selection = mRefreshableView.getCount() - 1;
        scroll = mRefreshableView.getLastVisiblePosition() == selection;
        break;
      case PULL_DOWN_TO_REFRESH:
      default:
        originalLoadingLayout = getHeaderLayout();
        listViewLoadingLayout = mHeaderLoadingView;
        scrollToHeight *= -1;
        selection = 0;
        scroll = mRefreshableView.getFirstVisiblePosition() == selection;
        break;
    }

    // Set our Original View to Visible
    originalLoadingLayout.setVisibility(View.VISIBLE);

    /**
     * Scroll so the View is at the same Y as the ListView header/footer,
     * but only scroll if we've pulled to refresh and it's positioned
     * correctly
     */
    if (scroll && getState() != MANUAL_REFRESHING) {
      mRefreshableView.setSelection(selection);
      setHeaderScroll(scrollToHeight);
    }

    // Hide the ListView Header/Footer
    listViewLoadingLayout.setVisibility(View.GONE);

    super.resetHeader();
  }

  @Override
  protected void setRefreshingInternal(boolean doScroll) {

    // If we're not showing the Refreshing view, or the list is empty, then
    // the header/footer views won't show so we use the
    // normal method
    ListAdapter adapter = mRefreshableView.getAdapter();
    if (!getShowViewWhileRefreshing() || null == adapter || adapter.isEmpty()) {
      super.setRefreshingInternal(doScroll);
      return;
    }

    super.setRefreshingInternal(false);

    final LoadingLayout originalLoadingLayout, listViewLoadingLayout;
    final int selection, scrollToY;

    switch (getCurrentMode()) {
      case PULL_UP_TO_REFRESH:
        originalLoadingLayout = getFooterLayout();
        listViewLoadingLayout = mFooterLoadingView;
        selection = mRefreshableView.getCount() - 1;
        scrollToY = getScrollY() - getHeaderHeight();
        break;
      case PULL_DOWN_TO_REFRESH:
      default:
        originalLoadingLayout = getHeaderLayout();
        listViewLoadingLayout = mHeaderLoadingView;
        selection = 0;
        scrollToY = getScrollY() + getHeaderHeight();
        break;
    }

    if (doScroll) {
      // We scroll slightly so that the ListView's header/footer is at the
      // same Y position as our normal header/footer
      setHeaderScroll(scrollToY);
    }

    // Hide our original Loading View
    originalLoadingLayout.setVisibility(View.INVISIBLE);

    // Show the ListView Loading View and set it to refresh
    listViewLoadingLayout.setVisibility(View.VISIBLE);
    listViewLoadingLayout.refreshing();

    if (doScroll) {
      // Make sure the ListView is scrolled to show the loading
      // header/footer
      mRefreshableView.setSelection(selection);

      // Smooth scroll as normal
      smoothScrollTo(0);
    }
  }

  class InternalListView extends ListView implements EmptyViewMethodAccessor {

    private boolean mAddedLvFooter = false;

    public InternalListView(Context context, AttributeSet attrs) {
      super(context, attrs);
    }

    @Override
    public void draw(Canvas canvas) {
      /**
       * This is a bit hacky, but ListView has got a bug in it when using
       * Header/Footer Views and the list is empty. This masks the issue
       * so that it doesn't cause an FC. See Issue #66.
       */
      try {
        super.draw(canvas);
      } catch (Exception e) {
        e.printStackTrace();
      }
    }

    public ContextMenuInfo getContextMenuInfo() {
      return super.getContextMenuInfo();
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
      // Add the Footer View at the last possible moment
      if (!mAddedLvFooter) {
        addFooterView(mLvFooterLoadingFrame, null, false);
        mAddedLvFooter = true;
      }

      super.setAdapter(adapter);
    }

    @Override
    public void setEmptyView(View emptyView) {
      PullToRefreshListView.this.setEmptyView(emptyView);
    }

    public void setEmptyViewInternal(View emptyView) {
      super.setEmptyView(emptyView);
    }
  }

}
Java Source Code List
