Android Open Source - FPlayAndroid Base List

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
//// w w w .  ja va2 s.  com
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.list;

import android.database.DataSetObserver;
import android.widget.BaseAdapter;

import java.lang.reflect.Array;
import java.util.Arrays;

import br.com.carlosrafaelgn.fplay.ui.BgListView;
import br.com.carlosrafaelgn.fplay.ui.UI;

//
//SINCE ALL CALLS MADE BY Player ARE MADE ON THE MAIN THREAD, THERE IS NO
//NEED TO SYNCHRONIZE THE ACCESS TO THE ITEMS
//
public abstract class BaseList<E extends BaseItem> extends BaseAdapter {
  public static interface BaseSectionIndexer {
    public boolean hasSections();
    public String[] getSectionStrings();
    public int[] getSectionPositions();
  }
  
  protected static final int LIST_DELTA = 32;
  
  protected static final int SELECTION_CHANGED = 0;
  protected static final int LIST_CLEARED = 1;
  protected static final int CONTENT_MOVED = 2;
  protected static final int CONTENT_ADDED = 3;
  protected static final int CONTENT_REMOVED = 4;
  
  protected BgListView listObserver;
  protected DataSetObserver observer;
  protected final Object sync;
  protected E[] items;
  protected int count, current, firstSel, lastSel, originalSel, indexOfPreviouslyDeletedCurrentItem, modificationVersion;
  
  @SuppressWarnings("unchecked")
  public BaseList(Class<E> c) {
    this.sync = new Object();
    this.items = (E[])Array.newInstance(c, LIST_DELTA);
    this.current = -1;
    this.firstSel = -1;
    this.lastSel = -1;
    this.originalSel = -1;
    this.indexOfPreviouslyDeletedCurrentItem = -1;
  }
  
  protected void addingItems(int position, int count) { }
  
  protected void removingItems(int position, int count) { }
  
  protected void clearingItems() { }
  
  private void setCapacity(int capacity) {
    if (capacity >= count && (capacity > items.length || capacity <= (items.length - (2 * LIST_DELTA))))
      items = Arrays.copyOf(items, capacity + LIST_DELTA);
  }
  
  public final void add(E item, int position) {
    if (firstSel != lastSel)
      setSelection(firstSel, firstSel, false, false);
    
    if (position < 0 || position >= count)
      position = count;
    
    setCapacity(count + 1);
    
    //synchronized (sync) {
      modificationVersion++;
      if (count != position)
        System.arraycopy(items, position, items, position + 1, count - position);
      items[position] = item;
      count++;
      if (current >= position)
        current++;
      if (current >= count)
        current = count - 1;
      if (firstSel >= position)
        firstSel++;
      if (lastSel >= position)
        lastSel++;
      addingItems(position, 1);
    //}
    
    notifyDataSetChanged(-1, CONTENT_ADDED);
  }
  
  public final void add(int position, E[] items, int firstIndex, int count) {
    if (count <= 0)
      return;
    
    if (position < 0 || position >= this.count)
      position = this.count;
    if (count > items.length)
      count = items.length;
    
    setCapacity(this.count + count);
    
    //synchronized (sync) {
      modificationVersion++;
      if (this.count != position)
        System.arraycopy(this.items, position, this.items, position + count, this.count - position);
      System.arraycopy(items, firstIndex, this.items, position, count);
      this.count += count;
      if (current >= position)
        current += count;
      if (firstSel >= position)
        firstSel += count;
      if (lastSel >= position)
        lastSel += count;
      if (originalSel >= position)
        originalSel += count;
      addingItems(position, count);
    //}
    
    notifyDataSetChanged(-1, CONTENT_ADDED);
  }
  
  public final void clear() {
    //synchronized (sync) {
      clearingItems();
      
      modificationVersion++;
      for (int i = items.length - 1; i >= 0; i--)
        items[i] = null;
      count = 0;
      current = -1;
      firstSel = -1;
      lastSel = -1;
      originalSel = -1;
      indexOfPreviouslyDeletedCurrentItem = -1;
    //}
    notifyDataSetChanged(-1, LIST_CLEARED);
  }
  
  public final boolean removeSelection() {
    int position = firstSel, count = lastSel - firstSel + 1;
    if (position < 0 || position >= this.count || count <= 0)
      return false;
    
    if ((position + count) > this.count)
      count = this.count - position;
    if (count <= 0)
      return false;
    
    if (firstSel != lastSel)
      setSelection(firstSel, firstSel, false, false);
    
    //synchronized (sync) {
      removingItems(position, count);
      
      modificationVersion++;
      
      System.arraycopy(items, position + count, items, position, (this.count - position - count));
      
      final int oldCount = this.count;
      this.count -= count;
      for (int i = this.count; i < oldCount; i++)
        items[i] = null;
      
      if (indexOfPreviouslyDeletedCurrentItem >= 0) {
        if (indexOfPreviouslyDeletedCurrentItem >= position && indexOfPreviouslyDeletedCurrentItem < (position + count))
          indexOfPreviouslyDeletedCurrentItem = position;
        else if (indexOfPreviouslyDeletedCurrentItem > position)
          indexOfPreviouslyDeletedCurrentItem -= count;
        if (indexOfPreviouslyDeletedCurrentItem >= this.count)
          indexOfPreviouslyDeletedCurrentItem = -1;
      }
      if (current >= position && current < (position + count)) {
        indexOfPreviouslyDeletedCurrentItem = position;
        current = -1;
      } else if (current > position) {
        current -= count;
      }
      if (current >= this.count)
        current = -1;
      if (firstSel >= this.count)
        firstSel = this.count - 1;
      //if (firstSel >= position && firstSel < (position + count)) {
      //  firstSel = -1;
      //  lastSel = -1;
      //} else if (firstSel > position) {
      //  firstSel -= count;
      //  lastSel = firstSel;
      //}
      lastSel = firstSel;
      originalSel = firstSel;
    //}
    setCapacity(this.count);
    
    notifyDataSetChanged(originalSel, CONTENT_REMOVED);
    
    return true;
  }
  
  public final void moveSelection(int to) {
    int from = firstSel, count = lastSel - firstSel + 1;
    if (from < 0 || to < 0 || count <= 0)
      return;
    if (count > this.count)
      count = this.count;
    if ((from + count) > this.count)
      count = this.count - from;
    if (count <= 0)
      return;
    if (to >= this.count)
      to = this.count - 1;
    if (to >= from && to < (from + count)) {
      if (originalSel != to) {
        originalSel = to;
        notifyDataSetChanged(-1, SELECTION_CHANGED);
      }
      return;
    }
    Object[] tmp = new Object[count];
    System.arraycopy(items, from, tmp, 0, count);
    //synchronized (sync) {
      modificationVersion++;
      final int delta;
      if (to < from) {
        delta = to - from;
        System.arraycopy(items, to, items, to + count, from - to);
        System.arraycopy(tmp, 0, items, to, count);
      } else {
        delta = to - (from + count) + 1;
        System.arraycopy(items, from + count, items, from, delta);
        System.arraycopy(tmp, 0, items, from + delta, count);
      }
      if (current < from && current >= to)
        current += count;
      else if (current >= from && current < (from + count))
        current += delta;
      else if (current > from && current <= to)
        current -= count;
      firstSel += delta;
      lastSel += delta;
      originalSel = to;
    //}
    notifyDataSetChanged(-1, CONTENT_MOVED);
  }
  
  public final int getSelection() {
    return originalSel;
  }
  
  public final int getCurrentPosition() {
    return current;
  }
  
  public final int getFirstSelectedPosition() {
    return firstSel;
  }
  
  public final int getLastSelectedPosition() {
    return lastSel;
  }
  
  public final boolean isSelected(int position) {
    return (position >= 0 && position >= firstSel && position <= lastSel);
  }
  
  public final void setSelection(int position, boolean byUserInteraction) {
    setSelection(position, position, position, true, byUserInteraction);
  }
  
  public final void setSelection(int from, int to, boolean notifyChanged, boolean byUserInteraction) {
    setSelection(from, to, -1, notifyChanged, byUserInteraction);
  }
  
  public final void setSelection(int from, int to, int original, boolean notifyChanged, boolean byUserInteraction) {
    int gotoPosition = -1;
    firstSel = -1;
    lastSel = -1;
    if (from >= 0 && to >= 0) {
      if (from >= count)
        from = count - 1;
      if (to >= count)
        to = count - 1;
      if (from > to) {
        firstSel = to;
        lastSel = from;
      } else {
        firstSel = from;
        lastSel = to;
      }
      if (from == to && ((original < 0) || (from < 0))) {
        originalSel = from;
        gotoPosition = from;
      }
    } else {
      originalSel = -1;
    }
    if (original >= 0 && original >= firstSel && original <= lastSel) {
      originalSel = original;
      gotoPosition = original;
    }
    if (notifyChanged)
      notifyDataSetChanged(byUserInteraction ? -1 : gotoPosition, SELECTION_CHANGED);
  }
  
  public final int indexOf(E item) {
    for (int i = 0; i < count; i++) {
      if (items[i] == item)
        return i;
    }
    return -1;
  }
  
  public final int lastIndexOf(E item) {
    for (int i = count - 1; i >= 0; i--) {
      if (items[i] == item)
        return i;
    }
    return -1;
  }
  
  @Override
  public final int getCount() {
    return count;
  }
  
  @Override
  public final Object getItem(int position) {
    return items[position];
  }
  
  public final E getItemT(int position) {
    return items[position];
  }
  
  @Override
  public final long getItemId(int position) {
    return items[position].id;
  }
  
  @Override
  public final boolean areAllItemsEnabled() {
    return true;
  }
  
  @Override
  public final int getItemViewType(int position) {
    return 0;
  }
  
  @Override
  public final int getViewTypeCount() {
    return 1;
  }
  
  @Override
  public final boolean hasStableIds() {
    return true;
  }
  
  @Override
  public final boolean isEnabled(int position) {
    return true;
  }
  
  @Override
  public final boolean isEmpty() {
    return (count == 0);
  }
  
  public final void setObserver(BgListView list) {
    //if (listObserver != null)
    //  listObserver.setAdapter(null);
    listObserver = list;
    if (list != null)
      list.setAdapter(this);
  }
  
  @Override
  public final void registerDataSetObserver(DataSetObserver observer) {
    //we only need to support one observer
    this.observer = observer;
  }
  
  @Override
  public final void unregisterDataSetObserver(DataSetObserver observer) {
    //we only need to support one observer
    this.observer = null;
  }
  
  protected void notifyDataSetChanged(int gotoPosition, int whatHappened) {
    if (observer != null)
      observer.onChanged();
    if (listObserver != null && gotoPosition >= 0)
      listObserver.centerItem(gotoPosition, false);
  }
  
  public void notifyCheckedChanged() {
    notifyDataSetChanged(-1, SELECTION_CHANGED);
  }
  
  protected final int getItemState(int position) {
    return ((position == current) ? UI.STATE_CURRENT : 0) | ((position == originalSel) ? UI.STATE_SELECTED :
      ((position >= firstSel && position <= lastSel) ? UI.STATE_MULTISELECTED : 0));
  }
  
  public abstract int getViewHeight();
}
Java Source Code List
