package com.tweetlanes.android.core.widget.pulltorefresh;
import android.content.Context;
import android.util.AttributeSet;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import com.tweetlanes.android.core.widget.pulltorefresh.internal.EmptyViewMethodAccessor;
public abstract class PullToRefreshAdapterViewBase<T extends AbsListView>
extends PullToRefreshBase<T> implements OnScrollListener {
private int mLastSavedFirstVisibleItem = -1;
private OnScrollListener mOnScrollListener;
private OnLastItemVisibleListener mOnLastItemVisibleListener;
private View mEmptyView;
private FrameLayout mRefreshableViewHolder;
PullToRefreshAdapterViewBase(Context context) {
super(context);
mRefreshableView.setOnScrollListener(this);
}
PullToRefreshAdapterViewBase(Context context, int mode) {
super(context, mode);
mRefreshableView.setOnScrollListener(this);
}
PullToRefreshAdapterViewBase(Context context, AttributeSet attrs) {
super(context, attrs);
mRefreshableView.setOnScrollListener(this);
}
abstract public ContextMenuInfo getContextMenuInfo();
public final void onScroll(final AbsListView view,
final int firstVisibleItem, final int visibleItemCount,
final int totalItemCount) {
if (null != mOnLastItemVisibleListener) {
// detect if last item is visible
if (visibleItemCount > 0
&& (firstVisibleItem + visibleItemCount == totalItemCount)) {
// only process first event
if (firstVisibleItem != mLastSavedFirstVisibleItem) {
mLastSavedFirstVisibleItem = firstVisibleItem;
mOnLastItemVisibleListener.onLastItemVisible();
}
}
}
if (null != mOnScrollListener) {
mOnScrollListener.onScroll(view, firstVisibleItem,
visibleItemCount, totalItemCount);
}
}
public final void onScrollStateChanged(final AbsListView view,
final int scrollState) {
if (null != mOnScrollListener) {
mOnScrollListener.onScrollStateChanged(view, scrollState);
}
}
/**
* Sets the Empty View to be used by the Adapter View.
* <p/>
* We need it handle it ourselves so that we can Pull-to-Refresh when the
* Empty View is shown.
* <p/>
* Please note, you do <strong>not</strong> usually need to call this method
* yourself. Calling setEmptyView on the AdapterView will automatically call
* this method and set everything up. This includes when the Android
* Framework automatically sets the Empty View based on it's ID.
*
* @param newEmptyView - Empty View to be used
*/
final void setEmptyView(View newEmptyView) {
// If we already have an Empty View, remove it
if (null != mEmptyView) {
mRefreshableViewHolder.removeView(mEmptyView);
}
if (null != newEmptyView) {
ViewParent newEmptyViewParent = newEmptyView.getParent();
if (null != newEmptyViewParent
&& newEmptyViewParent instanceof ViewGroup) {
((ViewGroup) newEmptyViewParent).removeView(newEmptyView);
}
this.mRefreshableViewHolder.addView(newEmptyView,
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT);
}
if (mRefreshableView instanceof EmptyViewMethodAccessor) {
((EmptyViewMethodAccessor) mRefreshableView)
.setEmptyViewInternal(newEmptyView);
} else {
this.mRefreshableView.setEmptyView(newEmptyView);
}
}
public final void setOnLastItemVisibleListener(
OnLastItemVisibleListener listener) {
mOnLastItemVisibleListener = listener;
}
public final void setOnScrollListener(OnScrollListener listener) {
mOnScrollListener = listener;
}
protected void addRefreshableView(Context context, T refreshableView) {
mRefreshableViewHolder = new FrameLayout(context);
mRefreshableViewHolder.addView(refreshableView,
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT);
addView(mRefreshableViewHolder, new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, 0, 1.0f));
}
protected boolean isReadyForPullDown() {
return isFirstItemVisible();
}
protected boolean isReadyForPullUp() {
return isLastItemVisible();
}
private boolean isFirstItemVisible() {
if (this.mRefreshableView.getCount() == 0) {
return true;
} else if (mRefreshableView.getFirstVisiblePosition() == 0) {
final View firstVisibleChild = mRefreshableView.getChildAt(0);
if (firstVisibleChild != null) {
return firstVisibleChild.getTop() >= mRefreshableView.getTop();
}
}
return false;
}
private boolean isLastItemVisible() {
final int count = this.mRefreshableView.getCount();
final int lastVisiblePosition = mRefreshableView
.getLastVisiblePosition();
if (count == 0) {
return true;
} else if (lastVisiblePosition == count - 1) {
final int childIndex = lastVisiblePosition
- mRefreshableView.getFirstVisiblePosition();
final View lastVisibleChild = mRefreshableView
.getChildAt(childIndex);
if (lastVisibleChild != null) {
return lastVisibleChild.getBottom() <= mRefreshableView
.getBottom();
}
}
return false;
}
}