Android Browser学习六 多窗口: NavScreen 切换窗口
前面咱们简单介绍了Tab和TabControl的大致结构,可是若是想要实现浏览器的多标签切换功能, 还须要一个用户交互界面, 这个界面在Android Browser中就是NavScreen了: java
这里咱们介绍一下下面这个UI的实现, 主要代码在NavScreen.java中. web
咱们知道, 在Android Browser中 用以和用户打交道的功能基本都被限制在了BaseUI中, 在手机上它的实现就是PhoneUI: 浏览器
显示多窗口列表固然也是不例外的:PhoneUI::showNavScreen: 数据结构
//点击按钮显示多窗口列表
void showNavScreen() {
mUiController.setBlockEvents(true); //拦截多窗口外的其余操做
if (mNavScreen == null) {
mNavScreen = new NavScreen(mActivity, mUiController, this);
mCustomViewContainer.addView(mNavScreen, COVER_SCREEN_PARAMS);
} else {
mNavScreen.setVisibility(View.VISIBLE);
mNavScreen.setAlpha(1f);
mNavScreen.refreshAdapter();
}
mActiveTab.capture();
if (mAnimScreen == null) {
//这是动画的视图 ,多标签窗口切换的动画师phoneui来实现的而不是 navscreen ,也就是说我点击一个tab 剩下的看到的实际上是
//真正的web窗口
mAnimScreen = new AnimScreen(mActivity);
} else {
mAnimScreen.mMain.setAlpha(1f);
mAnimScreen.mTitle.setAlpha(1f);
mAnimScreen.setScaleFactor(1f);
}
//设置动画须要截图的view
mAnimScreen.set(getTitleBar(), getWebView());
if (mAnimScreen.mMain.getParent() == null) {
//若是animscreen 的main没有父亲, 说明是执行了 全屏模式
mCustomViewContainer.addView(mAnimScreen.mMain, COVER_SCREEN_PARAMS);
}
mCustomViewContainer.setVisibility(View.VISIBLE);
mCustomViewContainer.bringToFront();//把这个view放到顶层
mAnimScreen.mMain.layout(0, 0, mContentView.getWidth(),
mContentView.getHeight()); //动画的宽度和contentview同样大
int fromLeft = 0;
int fromTop = getTitleBar().getHeight();
int fromRight = mContentView.getWidth();
int fromBottom = mContentView.getHeight();
int width = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_width);
int height = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_height);
int ntth = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_titleheight);
int toLeft = (mContentView.getWidth() - width) / 2;
int toTop = ((fromBottom - (ntth + height)) / 2 + ntth);
int toRight = toLeft + width;
int toBottom = toTop + height;
float scaleFactor = width / (float) mContentView.getWidth();
detachTab(mActiveTab);
mContentView.setVisibility(View.GONE);
AnimatorSet set1 = new AnimatorSet();
AnimatorSet inanim = new AnimatorSet();
//使用上下左右的位置 使得 tab的运动轨迹 从整个屏幕 位置缩小到tab,不管当前tab在哪里
ObjectAnimator tx = ObjectAnimator.ofInt(mAnimScreen.mContent, "left",
fromLeft, toLeft);
ObjectAnimator ty = ObjectAnimator.ofInt(mAnimScreen.mContent, "top",
fromTop, toTop);
ObjectAnimator tr = ObjectAnimator.ofInt(mAnimScreen.mContent, "right",
fromRight, toRight);
ObjectAnimator tb = ObjectAnimator.ofInt(mAnimScreen.mContent, "bottom",
fromBottom, toBottom);
ObjectAnimator title = ObjectAnimator.ofFloat(mAnimScreen.mTitle, "alpha",
1f, 0f);
ObjectAnimator sx = ObjectAnimator.ofFloat(mAnimScreen, "scaleFactor",
1f, scaleFactor);
ObjectAnimator blend1 = ObjectAnimator.ofFloat(mAnimScreen.mMain,
"alpha", 1f, 0f);
blend1.setDuration(100);
inanim.playTogether(tx, ty, tr, tb, sx, title);
inanim.setDuration(200);
set1.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator anim) {
mCustomViewContainer.removeView(mAnimScreen.mMain);
finishAnimationIn();
mUiController.setBlockEvents(false);
}
});
set1.playSequentially(inanim, blend1);//inanim播放ok后播放 blend1 也就是先缩放而后在透明
set1.start();
}
他的结构也不是很复杂, 拿到了Activity 和Controller的引用, 而后有一个NavTabScroller (继承自NavTabScroller )和 一个TabAdapter (继承自 BaseAdapter)的成员, 他们是多窗口列表view的具体实现和数据来源了. NavScreen有一些Tab的操做, 他们基本都须要通知到Controller, 由于NavScreen只不过是UI 真正的操做是Controller来作的. ide
看一下NavTabScroller 是一个ScrollView, 多窗口之因此能够滑动就全靠他了, 他还实现了横向竖向滑动, 载入adapter的数据等功能: 函数
public class NavTabScroller extends ScrollerView {
static final int INVALID_POSITION = -1;
static final float[] PULL_FACTOR = { 2.5f, 0.9f };
interface OnRemoveListener {
public void onRemovePosition(int position);
}
interface OnLayoutListener {
public void onLayout(int l, int t, int r, int b);
}
private ContentLayout mContentView; //其实是一个linearlayout
private BaseAdapter mAdapter;
private OnRemoveListener mRemoveListener;
private OnLayoutListener mLayoutListener;
private int mGap;
private int mGapPosition;
private ObjectAnimator mGapAnimator;
// after drag animation velocity in pixels/sec
private static final float MIN_VELOCITY = 1500; //最小的滑动
private AnimatorSet mAnimator;
private float mFlingVelocity;
private boolean mNeedsScroll;
private int mScrollPosition;
DecelerateInterpolator mCubic;
int mPullValue;
他装载数据的操做是setAdapter函数调用handleDataChanged函数实现的: 布局
//装载多窗口数据
void handleDataChanged(int newscroll) {
int scroll = getScrollValue(); //是x方向scroll 仍是y
if (mGapAnimator != null) {
mGapAnimator.cancel();//取消动画
}
mContentView.removeAllViews();
for (int i = 0; i < mAdapter.getCount(); i++) {
View v = mAdapter.getView(i, null, mContentView);//从adapter中拿到view 添加到linearlayout上listview等其实也是这样实现的
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.gravity = (mHorizontal ? Gravity.CENTER_VERTICAL : Gravity.CENTER_HORIZONTAL);
mContentView.addView(v, lp);//添加tabview到那个mContentView . 居中显示
if (mGapPosition > INVALID_POSITION){
adjustViewGap(v, i);
}
}
if (newscroll > INVALID_POSITION) {
newscroll = Math.min(mAdapter.getCount() - 1, newscroll);//newscroll 是从0 开始到 adapter.count的
mNeedsScroll = true;
mScrollPosition = newscroll;
requestLayout();
} else {
setScrollValue(scroll); //滑动到顶部/左边
}
}
好 大致的UI就差很少这些了, 下面是其动画的实现: post
其动画分为如下几个: 动画
1.点击多窗口按钮 的时候, 整个浏览器窗口会缩小到多窗口列表, 而后显示出其余的窗口标签供做者选择 ui
2.点击多窗口列表任何一个窗口 其余的多窗口标签会消失 ,
整个窗口会扩到到整个屏幕
3.在多窗口列表中左右滑动任何一个窗口, 整个窗口会渐变和移动 直到删除
4.其实这个"listview"还有回弹功能, 效果是使小窗口的间距缩小,不过效果不是很明显, 应该有点小bug
那就从第一个动画开始分析:
这个动画是在PhoneUI::showNavScreen()函数实现的, 其实就是一个animator动画：
//点击按钮显示多窗口列表
void showNavScreen() {
mUiController.setBlockEvents(true); //拦截多窗口外的其余操做
if (mNavScreen == null) {
mNavScreen = new NavScreen(mActivity, mUiController, this);
mCustomViewContainer.addView(mNavScreen, COVER_SCREEN_PARAMS);
} else {
mNavScreen.setVisibility(View.VISIBLE);
mNavScreen.setAlpha(1f);
mNavScreen.refreshAdapter();
}
mActiveTab.capture();
if (mAnimScreen == null) {
//这是动画的视图 ,多标签窗口切换的动画师phoneui来实现的而不是 navscreen ,也就是说我点击一个tab 剩下的看到的实际上是
//真正的web窗口
mAnimScreen = new AnimScreen(mActivity);
} else {
mAnimScreen.mMain.setAlpha(1f);
mAnimScreen.mTitle.setAlpha(1f);
mAnimScreen.setScaleFactor(1f);
}
//设置动画须要截图的view
mAnimScreen.set(getTitleBar(), getWebView());
if (mAnimScreen.mMain.getParent() == null) {
//若是animscreen 的main没有父亲, 说明是执行了 全屏模式
mCustomViewContainer.addView(mAnimScreen.mMain, COVER_SCREEN_PARAMS); //把须要作动画的view添加到整个布局的上层
}
mCustomViewContainer.setVisibility(View.VISIBLE);
mCustomViewContainer.bringToFront();//把这个view放到顶层
mAnimScreen.mMain.layout(0, 0, mContentView.getWidth(),
mContentView.getHeight()); //动画的宽度和contentview同样大
int fromLeft = 0;
int fromTop = getTitleBar().getHeight();
int fromRight = mContentView.getWidth();
int fromBottom = mContentView.getHeight();
int width = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_width);
int height = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_height);
int ntth = mActivity.getResources().getDimensionPixelSize(R.dimen.nav_tab_titleheight);
int toLeft = (mContentView.getWidth() - width) / 2;
int toTop = ((fromBottom - (ntth + height)) / 2 + ntth);
int toRight = toLeft + width;
int toBottom = toTop + height;
float scaleFactor = width / (float) mContentView.getWidth();
detachTab(mActiveTab);
mContentView.setVisibility(View.GONE);
AnimatorSet set1 = new AnimatorSet();
AnimatorSet inanim = new AnimatorSet();
//使用上下左右的位置 使得 tab的运动轨迹 从整个屏幕 位置缩小到屏幕的中心 ,不管当前tab在哪里, 不过轨迹是同样的
ObjectAnimator tx = ObjectAnimator.ofInt(mAnimScreen.mContent, "left",
fromLeft, toLeft);
ObjectAnimator ty = ObjectAnimator.ofInt(mAnimScreen.mContent, "top",
fromTop, toTop);
ObjectAnimator tr = ObjectAnimator.ofInt(mAnimScreen.mContent, "right",
fromRight, toRight);
ObjectAnimator tb = ObjectAnimator.ofInt(mAnimScreen.mContent, "bottom",
fromBottom, toBottom);
ObjectAnimator title = ObjectAnimator.ofFloat(mAnimScreen.mTitle, "alpha",
1f, 0f);
ObjectAnimator sx = ObjectAnimator.ofFloat(mAnimScreen, "scaleFactor",
1f, scaleFactor);
ObjectAnimator blend1 = ObjectAnimator.ofFloat(mAnimScreen.mMain,
"alpha", 1f, 0f);
blend1.setDuration(100);
inanim.playTogether(tx, ty, tr, tb, sx, title);
inanim.setDuration(200);
set1.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator anim) {
mCustomViewContainer.removeView(mAnimScreen.mMain);//把作动画的view删除
finishAnimationIn();
mUiController.setBlockEvents(false);
}
});
set1.playSequentially(inanim, blend1);//inanim播放ok后播放 blend1 也就是先缩放而后在透明
set1.start();
}
/*
*其实动画是使用两个imageview在作, 这两个imageview 分别绘制了titlebar和webview
*/
static class AnimScreen {
private View mMain;
private ImageView mTitle;
private ImageView mContent;
private float mScale;
private Bitmap mTitleBarBitmap;
private Bitmap mContentBitmap;
public AnimScreen(Context ctx) {
mMain = LayoutInflater.from(ctx).inflate(R.layout.anim_screen,
null);
mTitle = (ImageView) mMain.findViewById(R.id.title);
mContent = (ImageView) mMain.findViewById(R.id.content);
mContent.setScaleType(ImageView.ScaleType.MATRIX);
mContent.setImageMatrix(new Matrix());
mScale = 1.0f;
setScaleFactor(getScaleFactor());
}
/**
* 包titilebar和webview的截图画到动画的view上
* @param tbar
* @param web
*/
public void set(TitleBar tbar, WebView web) {
if (tbar == null || web == null) {
return;
}
if (tbar.getWidth() > 0 && tbar.getEmbeddedHeight() > 0) {
if (mTitleBarBitmap == null
|| mTitleBarBitmap.getWidth() != tbar.getWidth()
|| mTitleBarBitmap.getHeight() != tbar.getEmbeddedHeight()) {
mTitleBarBitmap = safeCreateBitmap(tbar.getWidth(),
tbar.getEmbeddedHeight());
}
if (mTitleBarBitmap != null) {
Canvas c = new Canvas(mTitleBarBitmap);
tbar.draw(c);
c.setBitmap(null);
}
} else {
mTitleBarBitmap = null;
}
mTitle.setImageBitmap(mTitleBarBitmap);
mTitle.setVisibility(View.VISIBLE);
int h = web.getHeight() - tbar.getEmbeddedHeight();
if (mContentBitmap == null
|| mContentBitmap.getWidth() != web.getWidth()
|| mContentBitmap.getHeight() != h) {
mContentBitmap = safeCreateBitmap(web.getWidth(), h);
}
if (mContentBitmap != null) {
Canvas c = new Canvas(mContentBitmap);
int tx = web.getScrollX();
int ty = web.getScrollY();
c.translate(-tx, -ty - tbar.getEmbeddedHeight());
web.draw(c);
c.setBitmap(null);
}
mContent.setImageBitmap(mContentBitmap);
}
private Bitmap safeCreateBitmap(int width, int height) {
if (width <= 0 || height <= 0) {
Log.w(LOGTAG, "safeCreateBitmap failed! width: " + width
+ ", height: " + height);
return null;
}
return Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
}
/*
* 这个版本至显示content
*/
public void set(Bitmap image) {
mTitle.setVisibility(View.GONE);
mContent.setImageBitmap(image);
}
private void setScaleFactor(float sf) {
mScale = sf;
Matrix m = new Matrix();
m.postScale(sf,sf);
mContent.setImageMatrix(m);
}
private float getScaleFactor() {
return mScale;
}
}
知道了第一个动画如何实现, 第二个动画就好理解了, 正好是第一个动画的反过来, 不过此次动画的轨迹可能不同, 由于用户可能点击的是上面或者最底下的tab:固然, 经过navScreen就能够拿到选择tab的位置:整个操做调用的地方仍是比较多的好比选择tab 新建tab等都会调用到这个和动画.
//隐藏多窗口切换 动画基本同上面显示多标签
void hideNavScreen(int position, boolean animate) {
if (!showingNavScreen()) return;
final Tab tab = mUiController.getTabControl().getTab(position);
if ((tab == null) || !animate) {//彷佛还有别的能够打开tab的方式可是还不是很清楚在哪里
if (tab != null) {
setActiveTab(tab);
} else if (mTabControl.getTabCount() > 0) {
// use a fallback tab
setActiveTab(mTabControl.getCurrentTab());
}
mContentView.setVisibility(View.VISIBLE);
finishAnimateOut();
return;
}
NavTabView tabview = (NavTabView) mNavScreen.getTabView(position);
if (tabview == null) {
if (mTabControl.getTabCount() > 0) {
// use a fallback tab
setActiveTab(mTabControl.getCurrentTab());
}
mContentView.setVisibility(View.VISIBLE);
finishAnimateOut();
return;
}
mUiController.setBlockEvents(true);
mUiController.setActiveTab(tab);
mContentView.setVisibility(View.VISIBLE);
if (mAnimScreen == null) {
mAnimScreen = new AnimScreen(mActivity);
}
mAnimScreen.set(tab.getScreenshot());
mCustomViewContainer.addView(mAnimScreen.mMain, COVER_SCREEN_PARAMS); //全屏模式
mAnimScreen.mMain.layout(0, 0, mContentView.getWidth(),
mContentView.getHeight());
mNavScreen.mScroller.finishScroller();
ImageView target = tabview.mImage;
int toLeft = 0;
int toTop = getTitleBar().getHeight();
int toRight = mContentView.getWidth();
int width = target.getDrawable().getIntrinsicWidth();
int height = target.getDrawable().getIntrinsicHeight();
int fromLeft = tabview.getLeft() + target.getLeft() - mNavScreen.mScroller.getScrollX();
int fromTop = tabview.getTop() + target.getTop() - mNavScreen.mScroller.getScrollY();//target就是选择的tab tab的顶部位置 为了给人以 从原来位置扩大到整个屏幕的感受
int fromRight = fromLeft + width;
int fromBottom = fromTop + height;
float scaleFactor = mContentView.getWidth() / (float) width;
int toBottom = toTop + (int) (height * scaleFactor);
mAnimScreen.mContent.setLeft(fromLeft);
mAnimScreen.mContent.setTop(fromTop);
mAnimScreen.mContent.setRight(fromRight);
mAnimScreen.mContent.setBottom(fromBottom);
mAnimScreen.setScaleFactor(1f);
AnimatorSet set1 = new AnimatorSet();
ObjectAnimator fade2 = ObjectAnimator.ofFloat(mAnimScreen.mMain, "alpha", 0f, 1f);
ObjectAnimator fade1 = ObjectAnimator.ofFloat(mNavScreen, "alpha", 1f, 0f);
set1.playTogether(fade1, fade2);
set1.setDuration(100);
//使用上下左右的位置 使得 tab的运动轨迹 从原来位置扩展到整个屏幕,不管整个tab在哪里
AnimatorSet set2 = new AnimatorSet();
ObjectAnimator l = ObjectAnimator.ofInt(mAnimScreen.mContent, "left",
fromLeft, toLeft);
ObjectAnimator t = ObjectAnimator.ofInt(mAnimScreen.mContent, "top",
fromTop, toTop);
ObjectAnimator r = ObjectAnimator.ofInt(mAnimScreen.mContent, "right",
fromRight, toRight);
ObjectAnimator b = ObjectAnimator.ofInt(mAnimScreen.mContent, "bottom",
fromBottom, toBottom);
ObjectAnimator scale = ObjectAnimator.ofFloat(mAnimScreen, "scaleFactor",
1f, scaleFactor);
ObjectAnimator otheralpha = ObjectAnimator.ofFloat(mCustomViewContainer, "alpha", 1f, 0f);
otheralpha.setDuration(100);
set2.playTogether(l, t, r, b, scale);
set2.setDuration(200);
AnimatorSet combo = new AnimatorSet();
combo.playSequentially(set1, set2, otheralpha);
combo.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator anim) {
mCustomViewContainer.removeView(mAnimScreen.mMain);//动画结束的时候把动画view 隐藏
finishAnimateOut();//让当前窗口渐变消失
mUiController.setBlockEvents(false);
}
});
combo.start();
}
对于第三个动画, 左右滑动删除的动画, 其入口有二
a. Scrollview的onTouchEvent事件中调用的NavTabScroller::onOrthoDragFinished()函数, 其实最后仍是调用到animateOut函数
/*这是scrollview回调的一个函数,做用是 在用户左右滑动 tab以后 判断是否删除这个tab*/
@Override
protected void onOrthoDragFinished(View downView) {
if (mAnimator != null) return;
if (mIsOrthoDragged && downView != null) {
// offset
float diff = mHorizontal ? downView.getTranslationY() : downView.getTranslationX();
if (Math.abs(diff) > (mHorizontal ? downView.getHeight() : downView.getWidth()) / 2) {
// remove it 达到了删除tab的调节,开始删除
animateOut(downView, Math.signum(diff) * mFlingVelocity, diff);
} else {
// snap back 没有达到条件,就让view回来
offsetView(downView, 0);
}
}
}
在用户按住小tab移动的时候会执行offsetView函数:
private void offsetView(View v, float distance) {
v.setAlpha(getAlpha(v, distance));
//setTranslationY 这个功能应该只有3.0之后才支持 让view左右滑动
if (mHorizontal) {
v.setTranslationY(distance);
} else {
v.setTranslationX(distance);
}
}
b另外一种调用动画的方式比较简单了,其实就是直接调用animateOut函数:
看一下这个函数到底作了什么吧:
1.须要删除窗口的平移和alpha渐变
2.删除窗口后,其余窗口的上移,这是比较复杂的一个逻辑 ,大致是经过改变mGap这个参数实现,动画也是使用了animator:
/*删除 tab 动画 (左右滑动删除 )的显示*/
private void animateOut(final View v, float velocity, float start) {
if ((v == null) || (mAnimator != null)) return; //有其余动画就不要执行这个动画
final int position = mContentView.indexOfChild(v);
int target = 0;
if (velocity < 0) {//动画结束的位置
target = mHorizontal ? -getHeight() : -getWidth();
} else {
target = mHorizontal ? getHeight() : getWidth();
}
int distance = target - (mHorizontal ? v.getTop() : v.getLeft());
long duration = (long) (Math.abs(distance) * 1000 / Math.abs(velocity));//动画持续时间
int scroll = 0;
int translate = 0;
int gap = mHorizontal ? v.getWidth() : v.getHeight();
int centerView = getViewCenter(v);//获取view的中心
int centerScreen = getScreenCenter();//获取屏幕的中心
int newpos = INVALID_POSITION;
if (centerView < centerScreen - gap / 2) {
// top view删除的是上面的view
scroll = - (centerScreen - centerView - gap);
translate = (position > 0) ? gap : 0;
newpos = position;
} else if (centerView > centerScreen + gap / 2) {
// bottom view 删除的是底部的view
scroll = - (centerScreen + gap - centerView);
if (position < mAdapter.getCount() - 1) {
translate = -gap;
}
} else {
// center view 删除的是中间的view
scroll = - (centerScreen - centerView);
if (position < mAdapter.getCount() - 1) {
translate = -gap;
} else {
scroll -= gap;
}
}
mGapPosition = position;
final int pos = newpos;
ObjectAnimator trans = ObjectAnimator.ofFloat(v,
(mHorizontal ? TRANSLATION_Y : TRANSLATION_X), start, target); //控制待删除view的水平 移动
ObjectAnimator alpha = ObjectAnimator.ofFloat(v, ALPHA, getAlpha(v,start),//控制待删除view的透明变化
getAlpha(v,target));
AnimatorSet set1 = new AnimatorSet();
set1.playTogether(trans, alpha);
set1.setDuration(duration);
mAnimator = new AnimatorSet();
ObjectAnimator trans2 = null;
ObjectAnimator scroll1 = null;
if (scroll != 0) {
if (mHorizontal) {//调整scrollview的scroll位置
scroll1 = ObjectAnimator.ofInt(this, "scrollX", getScrollX(), getScrollX() + scroll);
} else {
scroll1 = ObjectAnimator.ofInt(this, "scrollY", getScrollY(), getScrollY() + scroll);
}
}
if (translate != 0) {
trans2 = ObjectAnimator.ofInt(this, "gap", 0, translate); //删除view会留下一个空白,须要让上面的view补充上 这里gap是 负值,由于view少了,坐标也就小了
}
final int duration2 = 200;
if (scroll1 != null) {
if (trans2 != null) {
AnimatorSet set2 = new AnimatorSet();
set2.playTogether(scroll1, trans2);
set2.setDuration(duration2);
mAnimator.playSequentially(set1, set2);
} else {
scroll1.setDuration(duration2);
mAnimator.playSequentially(set1, scroll1);
}
} else {
if (trans2 != null) {
trans2.setDuration(duration2);
mAnimator.playSequentially(set1, trans2);
}
}
mAnimator.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator a) {
if (mRemoveListener != null) {
mRemoveListener.onRemovePosition(position);//通知移除tab
mAnimator = null;
mGapPosition = INVALID_POSITION;
mGap = 0;
handleDataChanged(pos);
}
}
});
mAnimator.start();
}
至于切换就简单了,是在controller::setActiveTab()函数进行处理.
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