package com.android.view;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.Scroller;
import android.widget.Toast;
import com.android.entity.Constant;
/**
* Created by Administrator on 2016/5/31.
*/
public class SildingFinishFramLayout extends FrameLayout {
private String TAG = Constant.TAG;
//SildingFinishFramLayout 布局的父布局
private ViewGroup mParentView;
/**
* 滑动的最小距离
*/
private int mTouchSlop;
/**
* 按下点的X坐标
*/
private int downX;
/**
* 按下点的Y坐标
*/
private int downY;
/**
* 临时存储X坐标
*/
private int tempX;
/**
* 滑动类
*/
private Scroller mScroller;
/**
* SildingFinishLayout的宽度
*/
private int viewWidth;
/**
* 记录是否正在滑动
*/
private boolean isSilding;
private OnSildingFinishListener onSildingFinishListener;
private boolean enableLeftSildeEvent = true; //是否开启左侧切换事件
private boolean enableRightSildeEvent = true; // 是否开启右侧切换事件
private final int size = 400; //按下时范围(处于这个范围内就启用切换事件，目的是使当用户从左右边界点击时才响应)
private boolean isIntercept = false; //是否拦截触摸事件
private boolean canSwitch;//是否可切换
private boolean isSwitchFromLeft = false; //左侧切换
private boolean isSwitchFromRight = false; //右侧侧切换
private boolean isPreeButton = false; //按键位置
private int buttonWidth;
private int buttonHeight;
public SildingFinishFramLayout(Context context) {
this(context, null);
}
public SildingFinishFramLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SildingFinishFramLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
Log.e(TAG, "设备的最小滑动距离:" + mTouchSlop);
mScroller = new Scroller(context);
int y = (int)getResources().getDisplayMetrics().density *80;
buttonHeight = getResources().getDisplayMetrics().heightPixels - y;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (changed) {
// 获取SildingFinishFramLayout所在布局的父布局
mParentView = (ViewGroup) this.getParent();
viewWidth = this.getWidth();
}
Log.e(TAG, "viewWidth=" + viewWidth);
}
public void setEnableLeftSildeEvent(boolean enableLeftSildeEvent) {
this.enableLeftSildeEvent = enableLeftSildeEvent;
}
public void setEnableRightSildeEvent(boolean enableRightSildeEvent) {
this.enableRightSildeEvent = enableRightSildeEvent;
}
/**
* 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity
*
* @param onSildingFinishListener
*/
public void setOnSildingFinishListener(
OnSildingFinishListener onSildingFinishListener) {
this.onSildingFinishListener = onSildingFinishListener;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
float downX = ev.getRawX();
float downY = ev.getRawY();
Log.e(TAG, "downX =" + downX + ",viewWidth=" + viewWidth);
Log.e(TAG, "downY =" + downY + ",viewWidth=" + (buttonHeight-getChildAt(5).getWidth()) + " , height :"+buttonHeight);
if(downY>buttonHeight-getChildAt(5).getWidth() && downY <buttonHeight){
Log.i(TAG,"SildingGinishFramLayout : down button sildingfinish ");
isPreeButton = true;
}else{
isPreeButton = false;
}
if(enableLeftSildeEvent && downX < size && !isPreeButton){
Log.e(TAG, "downX 在左侧范围内 ,拦截事件");
isIntercept = true;
isSwitchFromLeft = true;
isSwitchFromRight = false;
return true;
}else if(enableRightSildeEvent && downX > (viewWidth - size) && !isPreeButton){
Log.e(TAG, "downX 在右侧范围内 ,拦截事件");
isIntercept = true;
isSwitchFromRight = true;
isSwitchFromLeft = false;
return true;
}else{
Log.e(TAG, "downX 不在范围内 ,不拦截事件");
isIntercept = false;
isSwitchFromLeft = false;
isSwitchFromRight = false;
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if(!isIntercept){//不拦截事件时 不处理
return false;
}
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
downX = tempX = (int) event.getRawX();
downY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
int moveX = (int) event.getRawX();
int deltaX = tempX - moveX;
tempX = moveX;
if (Math.abs(moveX - downX) > mTouchSlop && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
isSilding = true;
}
Log.e(TAG, "scroll deltaX=" + deltaX);
if(enableLeftSildeEvent){//左侧滑动
if (moveX - downX >= 0 && isSilding) {
mParentView.scrollBy(deltaX, 0);
}
}
if(enableRightSildeEvent){//右侧滑动
if (moveX - downX <= 0 && isSilding) {
mParentView.scrollBy(deltaX, 0);
}
}
Log.e(TAG + "/onTouchEvent", "mParentView.getScrollX()=" + mParentView.getScrollX());
break;
case MotionEvent.ACTION_UP:
isSilding = false;
//mParentView.getScrollX() <= -viewWidth / 2 ==>指左侧滑动
//mParentView.getScrollX() >= viewWidth / 2 ==>指右侧滑动
if (mParentView.getScrollX() <= -viewWidth / 2 || mParentView.getScrollX() >= viewWidth / 2) {
canSwitch = true;
if(isSwitchFromLeft){
scrollToRight();
}
if(isSwitchFromRight){
scrollToLeft();
}
} else {
scrollOrigin();
canSwitch = false;
}
break;
}
return true;
}
/**
* 滚动出界面至右侧
*/
private void scrollToRight() {
final int delta = (viewWidth + mParentView.getScrollX());
// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0, Math.abs(delta));
postInvalidate();
}
/**
* 滚动出界面至左侧
*/
private void scrollToLeft() {
final int delta = (viewWidth - mParentView.getScrollX());
// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
mScroller.startScroll(mParentView.getScrollX(), 0, delta - 1, 0, Math.abs(delta));//此处就不可用+1，也不卡直接用delta
postInvalidate();
}
/**
* 滚动到起始位置
*/
private void scrollOrigin() {
int delta = mParentView.getScrollX();
mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0,
Math.abs(delta));
postInvalidate();
}
@Override
public void computeScroll() {
// 调用startScroll的时候scroller.computeScrollOffset()返回true，
if (mScroller.computeScrollOffset()) {
mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
if (mScroller.isFinished()) {
if (onSildingFinishListener != null && canSwitch) {
Log.e(TAG, "mScroller finish");
if(isSwitchFromLeft){//回调，左侧切换事件
onSildingFinishListener.onSildingBack();
}
if(isSwitchFromRight){//右侧切换事件
onSildingFinishListener.onSildingForward();
}
}
}
}
}
public interface OnSildingFinishListener {
public void onSildingBack();
public void onSildingForward();
}
}