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