/*******************************************************************************
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* Copyright 2011, 2012 Chris Banes.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.videogo.widget.pulltorefresh;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.os.Build.VERSION;
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import android.os.Build.VERSION_CODES;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.MotionEvent;
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import android.view.View;
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import android.widget.FrameLayout;
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import android.widget.ListAdapter;
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import android.widget.ListView;
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import ezviz.ezopensdk.R;
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public class PullToRefreshListView extends PullToRefreshAdapterViewBase<ListView> {
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private LoadingLayout mHeaderLoadingView;
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private LoadingLayout mFooterLoadingView;
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private FrameLayout mLvFooterLoadingFrame;
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private boolean mListViewExtrasEnabled;
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public PullToRefreshListView(Context context) {
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super(context);
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}
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public PullToRefreshListView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public PullToRefreshListView(Context context, Mode mode) {
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super(context, mode);
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}
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@Override
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public final Orientation getPullToRefreshScrollDirection() {
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return Orientation.VERTICAL;
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}
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@Override
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protected void onRefreshing(final Boolean doScroll) {
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/**
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* If we're not showing the Refreshing view, or the list is empty, the the header/footer
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* views won't show so we use the normal method.
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*/
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ListAdapter adapter = mRefreshableView.getAdapter();
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if (!mListViewExtrasEnabled || !getShowViewWhileRefreshing() || null == adapter || adapter.isEmpty()) {
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super.onRefreshing(doScroll);
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return;
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}
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super.onRefreshing(false);
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final LoadingLayout origLoadingView, listViewLoadingView, oppositeListViewLoadingView;
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final int selection, scrollToY;
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switch (getCurrentMode()) {
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case MANUAL_REFRESH_ONLY:
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case PULL_FROM_END:
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origLoadingView = getFooterLayout();
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listViewLoadingView = mFooterLoadingView;
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oppositeListViewLoadingView = mHeaderLoadingView;
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selection = mRefreshableView.getCount() - 1;
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scrollToY = getScrollY() - getFooterSize();
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break;
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case PULL_FROM_START:
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default:
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origLoadingView = getHeaderLayout();
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listViewLoadingView = mHeaderLoadingView;
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oppositeListViewLoadingView = mFooterLoadingView;
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selection = 0;
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scrollToY = getScrollY() + getHeaderSize();
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break;
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}
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// Hide our original Loading View
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origLoadingView.reset();
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origLoadingView.hideAllViews();
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// Make sure the opposite end is hidden too
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if (oppositeListViewLoadingView != null)
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oppositeListViewLoadingView.setVisibility(View.GONE);
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// Show the ListView Loading View and set it to refresh.
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listViewLoadingView.setVisibility(View.VISIBLE);
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listViewLoadingView.refreshing();
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if (doScroll) {
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// We need to disable the automatic visibility changes for now
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disableLoadingLayoutVisibilityChanges();
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// We scroll slightly so that the ListView's header/footer is at the
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// same Y position as our normal header/footer
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setHeaderScroll(scrollToY);
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// Make sure the ListView is scrolled to show the loading
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// header/footer
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mRefreshableView.setSelection(selection);
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// Smooth scroll as normal
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smoothScrollTo(0);
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}
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}
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@Override
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protected void onReset() {
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/**
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* If the extras are not enabled, just call up to super and return.
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*/
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if (!mListViewExtrasEnabled) {
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super.onReset();
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return;
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}
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final LoadingLayout originalLoadingLayout, listViewLoadingLayout;
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final int scrollToHeight, selection;
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final boolean scrollLvToEdge;
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switch (getCurrentMode()) {
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case MANUAL_REFRESH_ONLY:
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case PULL_FROM_END:
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originalLoadingLayout = getFooterLayout();
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listViewLoadingLayout = mFooterLoadingView;
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selection = mRefreshableView.getCount() - 1;
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scrollToHeight = getFooterSize();
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scrollLvToEdge = Math.abs(mRefreshableView.getLastVisiblePosition() - selection) <= 1;
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break;
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case PULL_FROM_START:
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default:
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originalLoadingLayout = getHeaderLayout();
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listViewLoadingLayout = mHeaderLoadingView;
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scrollToHeight = -getHeaderSize();
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selection = 0;
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scrollLvToEdge = Math.abs(mRefreshableView.getFirstVisiblePosition() - selection) <= 1;
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break;
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}
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// If the ListView header loading layout is showing, then we need to
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// flip so that the original one is showing instead
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if (listViewLoadingLayout.getVisibility() == View.VISIBLE) {
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// Set our Original View to Visible
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originalLoadingLayout.showInvisibleViews();
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// Hide the ListView Header/Footer
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listViewLoadingLayout.setVisibility(View.GONE);
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/**
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* Scroll so the View is at the same Y as the ListView header/footer, but only scroll
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* if: we've pulled to refresh, it's positioned correctly
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*/
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if (scrollLvToEdge && getState() != State.MANUAL_REFRESHING) {
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mRefreshableView.setSelection(selection);
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setHeaderScroll(scrollToHeight);
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}
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}
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// Finally, call up to super
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super.onReset();
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}
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@Override
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protected LoadingLayoutProxy createLoadingLayoutProxy(final boolean includeStart, final boolean includeEnd) {
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LoadingLayoutProxy proxy = super.createLoadingLayoutProxy(includeStart, includeEnd);
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if (mListViewExtrasEnabled) {
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final Mode mode = getMode();
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if (includeStart && mode.showHeaderLoadingLayout()) {
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proxy.addLayout(mHeaderLoadingView);
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}
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if (includeEnd && mode.showFooterLoadingLayout()) {
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proxy.addLayout(mFooterLoadingView);
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}
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}
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return proxy;
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}
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protected ListView createListView(Context context, AttributeSet attrs) {
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final ListView lv;
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if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
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lv = new InternalListViewSDK9(context, attrs);
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} else {
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lv = new InternalListView(context, attrs);
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}
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return lv;
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}
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@Override
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protected ListView createRefreshableView(Context context, AttributeSet attrs) {
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ListView lv = createListView(context, attrs);
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// Set it to this so it can be used in ListActivity/ListFragment
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lv.setId(android.R.id.list);
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return lv;
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}
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@Override
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protected void handleStyledAttributes(TypedArray a) {
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super.handleStyledAttributes(a);
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mListViewExtrasEnabled = a.getBoolean(R.styleable.PullToRefresh_ptrListViewExtrasEnabled, true);
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if (mListViewExtrasEnabled) {
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/**
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* If the value for Scrolling While Refreshing hasn't been explicitly set via XML,
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* enable Scrolling While Refreshing.
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*/
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if (!a.hasValue(R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled)) {
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setScrollingWhileRefreshingEnabled(true);
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}
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}
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}
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@Override
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public void setLoadingLayoutCreator(LoadingLayoutCreator creator) {
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super.setLoadingLayoutCreator(creator);
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if (mListViewExtrasEnabled) {
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final FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
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FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL);
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// Create Loading Views ready for use later
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FrameLayout frame = new FrameLayout(getContext());
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mHeaderLoadingView = getLoadingLayoutCreator()
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.create(getContext(), true, getPullToRefreshScrollDirection());
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if (mHeaderLoadingView != null) {
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mHeaderLoadingView.setVisibility(View.GONE);
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frame.addView(mHeaderLoadingView, lp);
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mRefreshableView.addHeaderView(frame, null, false);
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}
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mLvFooterLoadingFrame = new FrameLayout(getContext());
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mFooterLoadingView = getLoadingLayoutCreator().create(getContext(), false,
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getPullToRefreshScrollDirection());
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if (mFooterLoadingView != null) {
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mFooterLoadingView.setVisibility(View.GONE);
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mLvFooterLoadingFrame.addView(mFooterLoadingView, lp);
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}
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}
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}
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@TargetApi(9)
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final class InternalListViewSDK9 extends InternalListView {
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public InternalListViewSDK9(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
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int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
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final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
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scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);
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// Does all of the hard work...
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OverscrollHelper.overScrollBy(PullToRefreshListView.this, deltaX, scrollX, deltaY, scrollY, isTouchEvent);
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return returnValue;
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}
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}
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protected class InternalListView extends ListView implements EmptyViewMethodAccessor {
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private boolean mAddedLvFooter = false;
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public InternalListView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected void dispatchDraw(Canvas canvas) {
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/**
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* This is a bit hacky, but Samsung's ListView has got a bug in it when using
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* Header/Footer Views and the list is empty. This masks the issue so that it doesn't
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* cause an FC. See Issue #66.
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*/
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try {
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super.dispatchDraw(canvas);
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} catch (IndexOutOfBoundsException e) {
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e.printStackTrace();
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}
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}
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@Override
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public boolean dispatchTouchEvent(MotionEvent ev) {
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/**
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* This is a bit hacky, but Samsung's ListView has got a bug in it when using
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* Header/Footer Views and the list is empty. This masks the issue so that it doesn't
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* cause an FC. See Issue #66.
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*/
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try {
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return super.dispatchTouchEvent(ev);
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} catch (IndexOutOfBoundsException e) {
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e.printStackTrace();
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return false;
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}
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}
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@Override
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public void setAdapter(ListAdapter adapter) {
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// Add the Footer View at the last possible moment
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if (null != mLvFooterLoadingFrame && !mAddedLvFooter) {
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addFooterView(mLvFooterLoadingFrame, null, false);
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mAddedLvFooter = true;
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}
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super.setAdapter(adapter);
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}
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@Override
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public void setEmptyView(View emptyView) {
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PullToRefreshListView.this.setEmptyView(emptyView);
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}
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@Override
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public void setEmptyViewInternal(View emptyView) {
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super.setEmptyView(emptyView);
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}
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}
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}
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