Android Insets相关知识总结

WindowState.java //属于Server端
void notifyInsetsChanged() {
  ProtoLog.d(WM_DEBUG_IME, "notifyInsetsChanged for %s ", this);
  try {
    mClient.insetsChanged(getInsetsState());
  } catch (RemoteException e) {
    Slog.w(TAG, "Failed to deliver inset state change w=" + this, e);
  }
}

ViewRootImpl#W
@Override
public void insetsChanged(InsetsState insetsState) {
  final ViewRootImpl viewAncestor = mViewAncestor.get();
  if (viewAncestor != null) {
    viewAncestor.dispatchInsetsChanged(insetsState);
  }
}

@Override
public void insetsControlChanged(InsetsState insetsState,
    InsetsSourceControl[] activeControls) {
  final ViewRootImpl viewAncestor = mViewAncestor.get();
  if (viewAncestor != null) {
    viewAncestor.dispatchInsetsControlChanged(insetsState, activeControls);
  }
}

case MSG_INSETS_CHANGED:
  mInsetsController.onStateChanged((InsetsState) msg.obj);
  break;
case MSG_INSETS_CONTROL_CHANGED: {
  mInsetsController.onStateChanged((InsetsState) args.arg1);
  mInsetsController.onControlsChanged((InsetsSourceControl[]) args.arg2);
  break;  //首先都会调用InsetsController的onStateChanged方法
}

public boolean onStateChanged(InsetsState state) {
  boolean stateChanged = !mState.equals(state, true ,false ) //判断client端state和传来的state是否一致
      || !captionInsetsUnchanged();
  //同时判断上次server端传来的state是否同当前传传来的state一致
  if (!stateChanged && mLastDispatchedState.equals(state)) {
    return false;
  }
  if (DEBUG) Log.d(TAG, "onStateChanged: " + state);
  updateState(state); 
  //判断client端本地state是否已经发生改变
  boolean localStateChanged = !mState.equals(mLastDispatchedState,
      true , true );
  //更新mLastDispatchedState 即更新server端传来的state
  mLastDispatchedState.set(state, true );
  //将更新apply到本地
  applyLocalVisibilityOverride();
  if (localStateChanged) {
    if (DEBUG) Log.d(TAG, "onStateChanged, notifyInsetsChanged, send state to WM: " + mState);
    //如果本地Insets发生改变了，通知server端Insets更改了
    mHost.notifyInsetsChanged();
    //更新传递给server端的InsetsState
    updateRequestedState();
  }
  return true;
}

public void onControlsChanged(InsetsSourceControl[] activeControls) {
  if (activeControls != null) {
    for (InsetsSourceControl activeControl : activeControls) {
      if (activeControl != null) {
        // TODO(b/122982984): Figure out why it can be null.
        mTmpControlArray.put(activeControl.getType(), activeControl);
      }
    }
  }

  boolean requestedStateStale = false;
  final int[] showTypes = new int[1]; //系统Insets会根据showTypes数组内的值去更新可见性
  final int[] hideTypes = new int[1];

  //遍历所有的SourceConsumer 更新system_server传来的InsetsSourceControl
  for (int i = mSourceConsumers.size() - 1; i >= 0; i--) {
    final InsetsSourceConsumer consumer = mSourceConsumers.valueAt(i);
    final InsetsSourceControl control = mTmpControlArray.get(consumer.getType());
    consumer.setControl(control, showTypes, hideTypes);
  }

  // Ensure to create source consumers if not available yet.
  //便利system_server传递来的InsetsSourceControl
  for (int i = mTmpControlArray.size() - 1; i >= 0; i--) {
    final InsetsSourceControl control = mTmpControlArray.valueAt(i);
    final @InternalInsetsType int type = control.getType();
    final InsetsSourceConsumer consumer = getSourceConsumer(type);
//如果consumer不存在会创建
    consumer.setControl(control, showTypes, hideTypes); //可以看到如果存在対赢得consumer 会调用setControl方法两次

   ...

  }
  mTmpControlArray.clear();
  
  //showTypes、hideTypes值会在setControl方法内进行修改
  int animatingTypes = invokeControllableInsetsChangedListeners();
  showTypes[0] &= ~animatingTypes;
  hideTypes[0] &= ~animatingTypes;

  //假设showTypes[0]=8 代表要显示输入法
  if (showTypes[0] != 0) {
    applyAnimation(showTypes[0], true , false );
  }
  //假设hideTypes[0]=8 代表要隐藏输入法
  if (hideTypes[0] != 0) {
    applyAnimation(hideTypes[0], false , false );
  }
  if (requestedStateStale) {
    updateRequestedState();
  }
}