ITYPE_STATUS_BAR,
ITYPE_NAVIGATION_BAR,
ITYPE_CAPTION_BAR,
ITYPE_TOP_GESTURES,
ITYPE_BOTTOM_GESTURES,
ITYPE_LEFT_GESTURES,
ITYPE_RIGHT_GESTURES,
ITYPE_TOP_TAPPABLE_ELEMENT,
ITYPE_BOTTOM_TAPPABLE_ELEMENT,
ITYPE_LEFT_DISPLAY_CUTOUT,
ITYPE_TOP_DISPLAY_CUTOUT,
ITYPE_RIGHT_DISPLAY_CUTOUT,
ITYPE_BOTTOM_DISPLAY_CUTOUT,
ITYPE_IME,
ITYPE_CLIMATE_BAR,
ITYPE_EXTRA_NAVIGATION_BAR

public boolean onStateChanged(InsetsState state) {
  boolean stateChanged = !mState.equals(state, true /* excludingCaptionInsets */,false /* excludeInvisibleIme */) || !captionInsetsUnchanged();
  if (!stateChanged && mLastDispatchedState.equals(state)) {
    return false;
  }
  updateState(state);

  boolean localStateChanged = !mState.equals(mLastDispatchedState,
      true /* excludingCaptionInsets */, true /* excludeInvisibleIme */);
  mLastDispatchedState.set(state, true /* copySources */);

  applyLocalVisibilityOverride();
  if (localStateChanged) {
    if (DEBUG) Log.d(TAG, "onStateChanged, notifyInsetsChanged, send state to WM: " + mState);
    mHost.notifyInsetsChanged();
    updateRequestedState();
  }
  return true;
}

WindowInsets calculateInsets（...）：基于當(dāng)前source設(shè)置計(jì)算新的windowInsets
void processSource（InsetsSource source，...）: 根據(jù)計(jì)算值更新source值

private final InsetsState mLastState = new InsetsState(); //舊的InsetsState
private final InsetsState mState = new InsetsState(); //新的InsetsState

private boolean isAboveIme(WindowContainer target）// 判斷當(dāng)前窗口是否處在輸入法窗口層級(jí)上
void onImeControlTargetChanged(@Nullable InsetsControlTarget imeTarget) //當(dāng)輸入法target 窗口發(fā)生變化觸發(fā)
InsetsState getInsetsForDispatch(@NonNull WindowState target) //分發(fā)Insets 對(duì)Insets進(jìn)一步更新（更新frame 或者visible）

private final @InternalInsetsType int mType;  //Insets類型 nav或者status或者...
private final Rect mFrame;  //代表Insets區(qū)域
private boolean mVisible;   //Insets可見性

public void setFrame(Rect frame)  //設(shè)置Insets大小
public void setVisible(boolean visible) //設(shè)置Insets可見性
private Insets calculateInsets(Rect relativeFrame, Rect frame, boolean ignoreVisibility)  //根據(jù)frame以及ignoreVisibility 計(jì)算Insets

protected boolean mRequestedVisible;  //單一Insets的可見性
private @Nullable InsetsSourceControl mSourceControl; // 持有InsetsSourceControl變量可以實(shí)現(xiàn)對(duì)單一InsetsSource的控制
protected final InsetsController mController; //所屬的InsetController
protected final InsetsState mState;  //本地state

public void updateSource(InsetsSource newSource, @AnimationType int animationType)  //更新mstate中的source 主要更新frame
public void show(boolean fromIme) //顯示Insets
protected void setRequestedVisible(boolean requestedVisible) //設(shè)置Insets的可見性
public void setControl(@Nullable InsetsSourceControl control,
    @InsetsType int[] showTypes, @InsetsType int[] hideTypes) //后面講
public void hide() //隱藏Insets
boolean applyLocalVisibilityOverride() //主要更新state可見性
protected boolean isRequestedVisibleAwaitingControl() //判斷當(dāng)前Insets是否會(huì)在獲得control時(shí)更新可見性，即判斷是否存在pending show（如果是bars 該方法等同于isRequestedVisible）

private boolean mIsRequestedVisibleAwaitingControl;  //判斷是否存在一個(gè)請(qǐng)求要讓輸入法顯示出來（但是由于當(dāng)前尚未獲得control因此暫時(shí)無法實(shí)現(xiàn)這個(gè)操作）
void notifyHidden()  //控制IMM隱藏輸入法
public @ShowResult int requestShow(boolean fromIme) //控制IMM顯示輸入法
public void removeSurface() //移除輸入法的surface
- InsetsSourceControl
對(duì)InsetsSource的控制者，用來控制Insets的產(chǎn)生者，內(nèi)部持有控制輸入法動(dòng)畫的Leash
private final @InternalInsetsType int mType;  //InsetsSource類型
private final @Nullable SurfaceControl mLeash;  //播放動(dòng)畫需要的Leash ，app可以控制對(duì)其設(shè)置position實(shí)現(xiàn)位移動(dòng)畫
private final Point mSurfacePosition;  //當(dāng)前l(fā)eash(Surface)在屏幕中的position
- InsetsSourceProvider
他是特定InsetsSource在server端的控制者，他被稱作provider是因?yàn)樗峁㊣nsetsSource給客戶端（客戶端通過InsetsSourceConsumer使用InsetsSource）

private InsetsControlTarget mImeTargetFromIme;  //輸入法Insets的control（Insets需要有一個(gè)control，否則他就會(huì)失控 不可控制）
private Runnable mShowImeRunner;  //顯示輸入法線程
private boolean mIsImeLayoutDrawn; //輸入法是否已經(jīng)繪制完成

/*關(guān)鍵成員變量*/
InsetsState mState = new InsetsState();  //記錄本地State （Client端的Insetsstate）
InsetsState mLastDispatchedState = new InsetsState(); //從system端傳來的InsetsState
InsetsState mRequestedState = new InsetsState(); //發(fā)送給系統(tǒng)端的InsetsState
SparseArray<InsetsSourceConsumer> mSourceConsumers = new SparseArray<>(); //持有sourceConsumers

/*關(guān)鍵方法*/
public void applyImeVisibility(boolean setVisible) //更新輸入法可見性
public void notifyFinished(InsetsAnimationControlRunner runner, boolean shown) //動(dòng)畫結(jié)束時(shí)回調(diào)方法
public void onControlsChanged(InsetsSourceControl[] activeControls) //當(dāng)系統(tǒng)端分發(fā)新的Insets Controls時(shí)被調(diào)用
public boolean onStateChanged(InsetsState state) //Insets或者InsetsControl發(fā)生改變會(huì)調(diào)用
public void setSystemBarsBehavior(@Behavior int behavior)
public void setSystemBarsAppearance(@Appearance int appearance, @Appearance int mask)  //更改Systembar的表現(xiàn)行為
public void show(@InsetsType int types, boolean fromIme) //顯示Insets
void hide(@InsetsType int types, boolean fromIme)  //隱藏Insets
private void updateState(InsetsState newState) //更新state
private void updateRequestedState() //如果Insets在client端發(fā)生改變?cè)僦匦掳l(fā)送到server端
public void applyAnimation(@InsetsType final int types, boolean show, boolean fromIme)  //更新Insets動(dòng)畫

WindowState.java //屬于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;  //首先都會(huì)調(diào)用InsetsController的onStateChanged方法
}

public boolean onStateChanged(InsetsState state) {
  boolean stateChanged = !mState.equals(state, true /* excludingCaptionInsets */,false /* excludeInvisibleIme */) //判斷client端state和傳來的state是否一致
      || !captionInsetsUnchanged();
  //同時(shí)判斷上次server端傳來的state是否同當(dāng)前傳傳來的state一致
  if (!stateChanged && mLastDispatchedState.equals(state)) {
    return false;
  }
  if (DEBUG) Log.d(TAG, "onStateChanged: " + state);
  updateState(state); 
  //判斷client端本地state是否已經(jīng)發(fā)生改變
  boolean localStateChanged = !mState.equals(mLastDispatchedState,
      true /* excludingCaptionInsets */, true /* excludeInvisibleIme */);
  //更新mLastDispatchedState 即更新server端傳來的state
  mLastDispatchedState.set(state, true /* copySources */);
  //將更新apply到本地
  applyLocalVisibilityOverride();
  if (localStateChanged) {
    if (DEBUG) Log.d(TAG, "onStateChanged, notifyInsetsChanged, send state to WM: " + mState);
    //如果本地Insets發(fā)生改變了，通知server端Insets更改了
    mHost.notifyInsetsChanged();
    //更新傳遞給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]; //系統(tǒng)Insets會(huì)根據(jù)showTypes數(shù)組內(nèi)的值去更新可見性
  final int[] hideTypes = new int[1];

  //遍歷所有的SourceConsumer 更新system_server傳來的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傳遞來的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不存在會(huì)創(chuàng)建
    consumer.setControl(control, showTypes, hideTypes); //可以看到如果存在対贏得consumer 會(huì)調(diào)用setControl方法兩次

   ...

  }
  mTmpControlArray.clear();
  
  //showTypes、hideTypes值會(huì)在setControl方法內(nèi)進(jìn)行修改
  int animatingTypes = invokeControllableInsetsChangedListeners();
  showTypes[0] &= ~animatingTypes;
  hideTypes[0] &= ~animatingTypes;

  //假設(shè)showTypes[0]=8 代表要顯示輸入法
  if (showTypes[0] != 0) {
    applyAnimation(showTypes[0], true /* show */, false /* fromIme */);
  }
  //假設(shè)hideTypes[0]=8 代表要隱藏輸入法
  if (hideTypes[0] != 0) {
    applyAnimation(hideTypes[0], false /* show */, false /* fromIme */);
  }
  if (requestedStateStale) {
    updateRequestedState();
  }
}