package com.wise.extend;
import com.wise.wawc.R;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Scroller;
/**
* 滑动菜单
* @author honesty
*/
public class SlidingMenuView extends ViewGroup{
private static final String TAG = "SlidingMenuView";
boolean isTag = true;
private static final int INVALID_SCREEN = -1;
private static final int SNAP_VELOCITY = 500;
private int mDefaultScreen = 1;
/**
* 当前显示屏幕
*/
private int mCurrentScreen;
private int mNextScreen = INVALID_SCREEN;
private Scroller mScroller;
private VelocityTracker mVelocityTracker;
private float mLastMotionX;
private float mLastMotionY;
private final static int TOUCH_STATE_REST = 0;
private final static int TOUCH_STATE_SCROLLING = 1;
/**
* 当前Touch状态，停止or移动
*/
public int mTouchState = TOUCH_STATE_REST;
private boolean mAllowLongPress;
private int mTouchSlop;
int rightWidth = 0;
int totalWidth = 0;
OnViewTouchMoveListener onViewTouchMoveListener;
int width;
public SlidingMenuView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// 获取屏幕宽度
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
width = Even((int) (wm.getDefaultDisplay().getWidth() * 0.8));// 屏幕宽度
}
public SlidingMenuView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initWorkspace();
postDelayed(new Runnable(){
@Override
public void run() {
Log.d(TAG, "findViewById(R.id.left_sliding_tab).getWidth() = " + findViewById(R.id.left_sliding_tab).getWidth());
scrollTo(findViewById(R.id.left_sliding_tab).getWidth(), 0);
}
}, 50);
}
private void initWorkspace() {
mScroller = new Scroller(getContext());
mCurrentScreen = mDefaultScreen;
mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
}
boolean isDefaultScreenShowing() {
return mCurrentScreen == mDefaultScreen;
}
public int getCurrentScreen() {
return mCurrentScreen;
}
public void setCurrentScreen(int currentScreen) {
mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1));
invalidate();
}
void showDefaultScreen() {
setCurrentScreen(mDefaultScreen);
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
} else if (mNextScreen != INVALID_SCREEN) {
mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1));
mNextScreen = INVALID_SCREEN;
clearChildrenCache();
}
}
@Override
public void scrollTo(int x, int y) {
super.scrollTo(x, y);
postInvalidate();
}
@Override
protected void dispatchDraw(Canvas canvas) {
final int scrollX = getScrollX();
super.dispatchDraw(canvas);
canvas.translate(scrollX, 0);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureViews(widthMeasureSpec, heightMeasureSpec);
}
public void measureViews(int widthMeasureSpec, int heightMeasureSpec){
int width_v1 = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
View v1 = findViewById(R.id.left_sliding_tab);
v1.measure(width_v1, heightMeasureSpec);
View v2 = findViewById(R.id.sliding_body);
v2.measure(widthMeasureSpec, heightMeasureSpec);
View v3 = findViewById(R.id.ll_right);
v3.measure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
rightWidth = getChildAt(0).getMeasuredWidth();
int childLeft = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != View.GONE) {
final int childWidth = child.getMeasuredWidth();
child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight());
childLeft += childWidth;
}
}
totalWidth = childLeft;
if(onViewTouchMoveListener != null){
onViewTouchMoveListener.OnViewLoad(totalWidth, getChildAt(0).getMeasuredWidth());
}
}
@Override
public boolean dispatchUnhandledMove(View focused, int direction) {
if (direction == View.FOCUS_LEFT) {
if (getCurrentScreen() > 0) {
snapToScreen(getCurrentScreen() - 1);
return true;
}
} else if (direction == View.FOCUS_RIGHT) {
if (getCurrentScreen() < getChildCount() - 1) {
snapToScreen(getCurrentScreen() + 1);
return true;
}
}
return super.dispatchUnhandledMove(focused, direction);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
//TODO
final int action = ev.getAction();
if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) {
return true;
}
final float x = ev.getX();
final float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_MOVE:
final int xDiff = (int) Math.abs(x - mLastMotionX);
final int yDiff = (int) Math.abs(y - mLastMotionY);
final int touchSlop = mTouchSlop;
boolean xMoved = xDiff > touchSlop;
boolean yMoved = yDiff > touchSlop;
if (xMoved || yMoved) {
if (xMoved) {
// Scroll if the user moved far enough along the X axis
mTouchState = TOUCH_STATE_SCROLLING;
enableChildrenCache();
}
// Either way, cancel any pending longpress
if (mAllowLongPress) {
mAllowLongPress = false;
// Try canceling the long press. It could also have been scheduled
// by a distant descendant, so use the mAllowLongPress flag to block
// everything
final View currentScreen = getChildAt(mCurrentScreen);
currentScreen.cancelLongPress();
}
}
break;
case MotionEvent.ACTION_DOWN:
// Remember location of down touch
mLastMotionX = x;
mLastMotionY = y;
mAllowLongPress = true;
mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
// Release the drag
clearChildrenCache();
mTouchState = TOUCH_STATE_REST;
mAllowLongPress = false;
break;
}
/*
* The only time we want to intercept motion events is if we are in the
* drag mode.
*/
return false;
//return mTouchState != TOUCH_STATE_REST;
}
void enableChildrenCache() {
//Log.d(TAG, "enableChildrenCache");
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View layout = (View) getChildAt(i);
layout.setDrawingCacheEnabled(true);
}
}
void clearChildrenCache() {
//Log.d(TAG, "clearChildrenCache");
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View layout = (View) getChildAt(i);
layout.setDrawingCacheEnabled(false);
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
final int action = ev.getAction();
final float x = ev.getX();
switch (action) {
case MotionEvent.ACTION_DOWN:
/*
* If being flinged and user touches, stop the fling. isFinished
* will be false if being flinged.
*/
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// Remember where the motion event started
mLastMotionX = x;
break;
case MotionEvent.ACTION_MOVE:
if (mTouchState == TOUCH_STATE_SCROLLING) {// TODO 考虑滑动过了的情况
int deltaX = (int) (mLastMotionX - x);
mLastMotionX = x;
deltaX = Even(deltaX);
if (deltaX < 0) {// 向右滑
if (getScrollX() > 0) {// 滚动的距离
if(getScrollX() > rightWidth){
}else{
int scrollX = Math.max(-getScrollX(), deltaX);
scrollBy(scrollX , 0);
if(onViewTouchMoveListener != null){
onViewTouchMoveListener.OnViewMove(getScrollX());
}
}
}
} else if (deltaX > 0) {
if(getScrollX() >= rightWidth){
}else{
final int availableToScroll = getChildAt(
getChildCount() - 1).getRight()
- getScrollX() - getWidth();
if (availableToScroll > 0) {
int scrollX = Math.min(availableToScroll, deltaX);
scrollBy(scrollX , 0);
if(onViewTouchMoveListener != null){
onViewTouchMoveListener.OnViewMove(getScrollX());
}
}
}
}
}
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000);
int velocityX = (int) velocityTracker.getXVelocity();
//Log.d(TAG, "mCurrentScreen = " + mCurrentScreen);
if(mCurrentScreen == 2){
}else{
if (velocityX > SNAP_VELOCITY) {//向左滑
snapToScreen(0);
} else if (velocityX < -SNAP_VELOCITY) {
snapToScreen(1);
} else {
snapToDestination();
}
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
mTouchState = TOUCH_STATE_REST;
break;
case MotionEvent.ACTION_CANCEL:
snapToDestination();
mTouchState = TOUCH_STATE_REST;
}
return true;
}
/**
* 偶数化
* @param deltaX
* @return
*/
private int Even(int deltaX){
if(deltaX%2 == 0){
}else{
deltaX += 1;
}
return deltaX;
}
protected void snapToDestination() {
int whichScreen = 0;
int count = getChildCount();
int start = 0;
int end = 0;
int viewWidth = 0;
int tend = 0;
int tstart = 0;
final int scrollX = getScrollX();
for(int i =0;i<count;i++){
viewWidth = getChildAt(i).getWidth();
tend = end + viewWidth/2;
if(i != 0 ){
viewWidth = getChildAt(i-1).getWidth();
}
tstart-=viewWidth;
if(scrollX > tstart && scrollX < tend){
break;
}
start+=viewWidth;
end+=viewWidth;
whichScreen++;
}
snapToScreen(whichScreen);
}
public void snapToScreen(int whichScreen) {
enableChildrenCache();
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
boolean changingScreens = whichScreen != mCurrentScreen;
mNextScreen = whichScreen;
mCurrentScreen = whichScreen;
Log.d(TAG, "whichScreen = " + whichScreen);
View focusedChild = getFocusedChild();
if (focusedChild != null && changingScreens && focusedChild == getChildAt(mCurrentScreen)) {
focusedChild.clearFocus();
}
int newX = 0;
for(int i=0;i<whichScreen;i++){
newX+=getChildAt(i).getWidth();
}
newX = Math.min(totalWidth - getWidth(), newX);
final int delta = newX - getScrollX();
int duration = Math.abs(delta)*2;
Log.d(TAG, "newX = " + newX + " , getScrollX() = " + getScrollX() + " , delta = " + delta);
//松开手后自动滑动
mScroller.startScroll(getScrollX(), 0, delta, 0, duration);
onViewTouchMoveListener.OnViewChange(getScrollX(), delta,whichScreen, duration);
invalidate();
}
void moveToDefaultScreen() {
snapToScreen(mDefaultScreen);
getChildAt(mDefaultScreen).requestFocus();
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
View child;
for(int i=0;i<getChildCount();i++){
child = getChildAt(i);
child.setFocusable(true);
child.setClickable(true);
}
//Log.d(TAG, "onFinishInflate");
}
public void setOnViewTouchMoveListener(OnViewTouchMoveListener onViewTouchMoveListener){
this.onViewTouchMoveListener = onViewTouchMoveListener;
}
}