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VisibleDelegate.java
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VisibleDelegate.java
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package me.yokeyword.fragmentation.helper.internal;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import java.util.List;
import androidx.fragment.app.FragmentationMagician;
import me.yokeyword.fragmentation.ISupportFragment;
/**
* Created by YoKey on 17/4/4.
*/
public class VisibleDelegate {
private static final String FRAGMENTATION_STATE_SAVE_IS_INVISIBLE_WHEN_LEAVE = "fragmentation_invisible_when_leave";
private static final String FRAGMENTATION_STATE_SAVE_COMPAT_REPLACE = "fragmentation_compat_replace";
// SupportVisible相关
private boolean mIsSupportVisible;
private boolean mNeedDispatch = true;
private boolean mInvisibleWhenLeave;
private boolean mIsFirstVisible = true;
private boolean mFirstCreateViewCompatReplace = true;
private boolean mAbortInitVisible = false;
private Runnable taskDispatchSupportVisible;
private Handler mHandler;
private Bundle mSaveInstanceState;
private ISupportFragment mSupportF;
private Fragment mFragment;
public VisibleDelegate(ISupportFragment fragment) {
this.mSupportF = fragment;
this.mFragment = (Fragment) fragment;
}
public void onCreate(@Nullable Bundle savedInstanceState) {
if (savedInstanceState != null) {
mSaveInstanceState = savedInstanceState;
// setUserVisibleHint() may be called before onCreate()
mInvisibleWhenLeave = savedInstanceState.getBoolean(FRAGMENTATION_STATE_SAVE_IS_INVISIBLE_WHEN_LEAVE);
mFirstCreateViewCompatReplace = savedInstanceState.getBoolean(FRAGMENTATION_STATE_SAVE_COMPAT_REPLACE);
}
}
public void onSaveInstanceState(Bundle outState) {
outState.putBoolean(FRAGMENTATION_STATE_SAVE_IS_INVISIBLE_WHEN_LEAVE, mInvisibleWhenLeave);
outState.putBoolean(FRAGMENTATION_STATE_SAVE_COMPAT_REPLACE, mFirstCreateViewCompatReplace);
}
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
if (!mFirstCreateViewCompatReplace && mFragment.getTag() != null && mFragment.getTag().startsWith("android:switcher:")) {
return;
}
if (mFirstCreateViewCompatReplace) {
mFirstCreateViewCompatReplace = false;
}
initVisible();
}
private void initVisible() {
if (!mInvisibleWhenLeave && !mFragment.isHidden() && mFragment.getUserVisibleHint()) {
if ((mFragment.getParentFragment() != null && isFragmentVisible(mFragment.getParentFragment()))
|| mFragment.getParentFragment() == null) {
mNeedDispatch = false;
safeDispatchUserVisibleHint(true);
}
}
}
public void onResume() {
if (!mIsFirstVisible) {
if (!mIsSupportVisible && !mInvisibleWhenLeave && isFragmentVisible(mFragment)) {
mNeedDispatch = false;
dispatchSupportVisible(true);
}
} else {
if (mAbortInitVisible) {
mAbortInitVisible = false;
initVisible();
}
}
}
public void onPause() {
if (taskDispatchSupportVisible != null) {
getHandler().removeCallbacks(taskDispatchSupportVisible);
mAbortInitVisible = true;
return;
}
if (mIsSupportVisible && isFragmentVisible(mFragment)) {
mNeedDispatch = false;
mInvisibleWhenLeave = false;
dispatchSupportVisible(false);
} else {
mInvisibleWhenLeave = true;
}
}
public void onHiddenChanged(boolean hidden) {
if (!hidden && !mFragment.isResumed()) {
//if fragment is shown but not resumed, ignore...
onFragmentShownWhenNotResumed();
return;
}
if (hidden) {
safeDispatchUserVisibleHint(false);
} else {
enqueueDispatchVisible();
}
}
private void onFragmentShownWhenNotResumed() {
mInvisibleWhenLeave = false;
dispatchChildOnFragmentShownWhenNotResumed();
}
private void dispatchChildOnFragmentShownWhenNotResumed() {
FragmentManager fragmentManager = mFragment.getChildFragmentManager();
List<Fragment> childFragments = FragmentationMagician.getActiveFragments(fragmentManager);
if (childFragments != null) {
for (Fragment child : childFragments) {
if (child instanceof ISupportFragment && !child.isHidden() && child.getUserVisibleHint()) {
((ISupportFragment) child).getSupportDelegate().getVisibleDelegate().onFragmentShownWhenNotResumed();
}
}
}
}
public void onDestroyView() {
mIsFirstVisible = true;
}
public void setUserVisibleHint(boolean isVisibleToUser) {
if (mFragment.isResumed() || (!mFragment.isAdded() && isVisibleToUser)) {
if (!mIsSupportVisible && isVisibleToUser) {
safeDispatchUserVisibleHint(true);
} else if (mIsSupportVisible && !isVisibleToUser) {
dispatchSupportVisible(false);
}
}
}
private void safeDispatchUserVisibleHint(boolean visible) {
if (mIsFirstVisible) {
if (!visible) return;
enqueueDispatchVisible();
} else {
dispatchSupportVisible(visible);
}
}
private void enqueueDispatchVisible() {
taskDispatchSupportVisible = new Runnable() {
@Override
public void run() {
taskDispatchSupportVisible = null;
dispatchSupportVisible(true);
}
};
getHandler().post(taskDispatchSupportVisible);
}
private void dispatchSupportVisible(boolean visible) {
if (visible && isParentInvisible()) return;
if (mIsSupportVisible == visible) {
mNeedDispatch = true;
return;
}
mIsSupportVisible = visible;
if (visible) {
if (checkAddState()) return;
mSupportF.onSupportVisible();
if (mIsFirstVisible) {
mIsFirstVisible = false;
mSupportF.onLazyInitView(mSaveInstanceState);
}
dispatchChild(true);
} else {
dispatchChild(false);
mSupportF.onSupportInvisible();
}
}
private void dispatchChild(boolean visible) {
if (!mNeedDispatch) {
mNeedDispatch = true;
} else {
if (checkAddState()) return;
FragmentManager fragmentManager = mFragment.getChildFragmentManager();
List<Fragment> childFragments = FragmentationMagician.getActiveFragments(fragmentManager);
if (childFragments != null) {
for (Fragment child : childFragments) {
if (child instanceof ISupportFragment && !child.isHidden() && child.getUserVisibleHint()) {
((ISupportFragment) child).getSupportDelegate().getVisibleDelegate().dispatchSupportVisible(visible);
}
}
}
}
}
private boolean isParentInvisible() {
Fragment parentFragment = mFragment.getParentFragment();
if (parentFragment instanceof ISupportFragment) {
return !((ISupportFragment) parentFragment).isSupportVisible();
}
return parentFragment != null && !parentFragment.isVisible();
}
private boolean checkAddState() {
if (!mFragment.isAdded()) {
mIsSupportVisible = !mIsSupportVisible;
return true;
}
return false;
}
private boolean isFragmentVisible(Fragment fragment) {
return !fragment.isHidden() && fragment.getUserVisibleHint();
}
public boolean isSupportVisible() {
return mIsSupportVisible;
}
private Handler getHandler() {
if (mHandler == null) {
mHandler = new Handler(Looper.getMainLooper());
}
return mHandler;
}
}