/**
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* @file XListViewHeader.java
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* @create Apr 18, 2012 5:22:27 PM
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* @author Maxwin
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* @description XListView's header
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*/
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package medusa.theone.waterdroplistview.view;
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import android.animation.Animator;
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import android.animation.AnimatorListenerAdapter;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.Gravity;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewTreeObserver;
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import android.widget.FrameLayout;
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import android.widget.LinearLayout;
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import android.widget.ProgressBar;
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import medusa.theone.waterdroplistview.R;
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import medusa.theone.waterdroplistview.utils.Utils;
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public class WaterDropListViewHeader extends FrameLayout {
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private LinearLayout mContainer;
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private ProgressBar mProgressBar;
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private WaterDropView mWaterDropView;
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private STATE mState = STATE.normal;
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private IStateChangedListener mStateChangedListener;
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private int stretchHeight;
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private int readyHeight;
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private static final int DISTANCE_BETWEEN_STRETCH_READY = 250;
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public enum STATE {
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normal,//正常
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stretch,//准备进行拉伸
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ready,//拉伸到最大位置
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refreshing,//刷新
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end//刷新结束，回滚
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}
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public WaterDropListViewHeader(Context context) {
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super(context);
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initView(context);
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}
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/**
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* @param context
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* @param attrs
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*/
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public WaterDropListViewHeader(Context context, AttributeSet attrs) {
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super(context, attrs);
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initView(context);
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}
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private void initView(Context context) {
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mContainer = (LinearLayout) LayoutInflater.from(context).inflate(
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R.layout.waterdroplistview_header, null);
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mProgressBar = (ProgressBar) mContainer.findViewById(R.id.waterdroplist_header_progressbar);
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mWaterDropView = (WaterDropView) mContainer.findViewById(R.id.waterdroplist_waterdrop);
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// 初始情况，设置下拉刷新view高度为0
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LayoutParams lp = new LayoutParams(
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LayoutParams.MATCH_PARENT, 0);
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addView(mContainer, lp);
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initHeight();
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}
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private void initHeight(){
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mContainer.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
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@Override
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public void onGlobalLayout() {
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stretchHeight = mWaterDropView.getHeight();
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readyHeight = stretchHeight + DISTANCE_BETWEEN_STRETCH_READY;
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getViewTreeObserver().removeGlobalOnLayoutListener(this);
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}
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});
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}
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/**
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* 修改状态。注：状态的改变与前一个状态以及下拉头高度有关
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*
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* @param state
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*/
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public void updateState(STATE state) {
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if (state == mState) return;
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STATE oldState = mState;
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mState = state;
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if (mStateChangedListener != null) {
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mStateChangedListener.notifyStateChanged(oldState, mState);
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}
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switch (mState) {
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case normal:
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handleStateNormal();
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break;
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case stretch:
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handleStateStretch();
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break;
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case ready:
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handleStateReady();
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break;
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case refreshing:
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handleStateRefreshing();
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break;
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case end:
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handleStateEnd();
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break;
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default:
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}
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}
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/**
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* 处理处于normal状态的值
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*/
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private void handleStateNormal() {
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mWaterDropView.setVisibility(View.VISIBLE);
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mProgressBar.setVisibility(View.GONE);
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mContainer.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL);
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}
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/**
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* 处理水滴拉伸状态
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*/
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private void handleStateStretch() {
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mWaterDropView.setVisibility(View.VISIBLE);
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mProgressBar.setVisibility(View.GONE);
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mContainer.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
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}
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/**
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* 处理水滴ready状态，回弹效果
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*/
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private void handleStateReady() {
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mWaterDropView.setVisibility(View.VISIBLE);
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mProgressBar.setVisibility(View.GONE);
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Animator shrinkAnimator = mWaterDropView.createAnimator();
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shrinkAnimator.addListener(new AnimatorListenerAdapter() {
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@Override
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public void onAnimationEnd(Animator animation) {
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//回弹结束后即进入refreshing状态
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updateState(STATE.refreshing);
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}
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});
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shrinkAnimator.start();//开始回弹
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}
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/**
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* 处理正在进行刷新状态
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*/
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private void handleStateRefreshing() {
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mWaterDropView.setVisibility(View.GONE);
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mProgressBar.setVisibility(View.VISIBLE);
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}
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/**
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* 处理刷新完毕状态
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*/
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private void handleStateEnd() {
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mWaterDropView.setVisibility(View.GONE);
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mProgressBar.setVisibility(View.GONE);
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}
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public void setVisiableHeight(int height) {
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if (height < 0)
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height = 0;
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LayoutParams lp = (LayoutParams) mContainer
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.getLayoutParams();
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lp.height = height;
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mContainer.setLayoutParams(lp);
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//通知水滴进行更新
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if(mState == STATE.stretch){
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float pullOffset = (float) Utils.mapValueFromRangeToRange(height, stretchHeight, readyHeight, 0, 1);
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if(pullOffset < 0 || pullOffset >1){
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throw new IllegalArgumentException("pullOffset should between 0 and 1!"+mState+" "+height);
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}
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Log.e("pullOffset", "pullOffset:" + pullOffset);
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mWaterDropView.updateComleteState(pullOffset);
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}
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}
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public int getVisiableHeight() {
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return mContainer.getHeight();
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}
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public STATE getCurrentState() {
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return mState;
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}
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public int getStretchHeight() {
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return stretchHeight;
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}
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public int getReadyHeight() {
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return readyHeight;
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}
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public void setStateChangedListener(IStateChangedListener l) {
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mStateChangedListener = l;
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}
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public interface IStateChangedListener {
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public void notifyStateChanged(STATE oldState, STATE newState);
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}
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}
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