程序包 ohos.agp.components

类 ComponentTreeObserver

java.lang.Object

ohos.agp.components.ComponentTreeObserver

public final class ComponentTreeObserver
extends Object

Defines listeners for the component hierarchy.

You can register listeners to monitor global changes in the component hierarchy.

从以下版本开始:

3

嵌套类概要

嵌套类

限定符和类型	类	说明
static interface	ComponentTreeObserver.GlobalFocusUpdatedListener	Callback to be invoked when the focus state within the component tree changes.
static interface	ComponentTreeObserver.GlobalLayoutListener	已过时。 This change is effective since API version 6. Replaced by Component.LayoutRefreshedListener
static interface	ComponentTreeObserver.ScrollChangedListener	Callback to be invoked when any element in the component hierarchy has been scrolled.
static interface	ComponentTreeObserver.WindowBoundListener	Callback to be invoked when the component hierarchy is bound to or unbound from its window.
static interface	ComponentTreeObserver.WindowFocusUpdatedListener	Callback to be invoked when the window focus state changes in the component hierarchy.

方法概要

限定符和类型	方法	说明
void	addGlobalFocusUpdatedListener(ComponentTreeObserver.GlobalFocusUpdatedListener listener)	Registers a listener for globalFocusChanged().
void	addScrolledListener(ComponentTreeObserver.ScrollChangedListener listener)	Registers a listener for scrollChanged().
void	addTreeLayoutChangedListener(ComponentTreeObserver.GlobalLayoutListener listener)	已过时。 This change is effective since API version 6. Replaced by setLayoutRefreshedListener(Component.LayoutRefreshedListener)
void	addWindowBoundListener(ComponentTreeObserver.WindowBoundListener listener)	Registers a listener for windowBound().
void	addWindowFocusUpdatedListener(ComponentTreeObserver.WindowFocusUpdatedListener listener)	Registers a listener for windowFocusUpdated().
void	removeGlobalFocusUpdatedListener(ComponentTreeObserver.GlobalFocusUpdatedListener listener)	Removes a listener registered for globalFocusChanged().
void	removeScrolledListener(ComponentTreeObserver.ScrollChangedListener listener)	Removes a listener registered for scrollChanged().
void	removeTreeLayoutChangedListener(ComponentTreeObserver.GlobalLayoutListener listener)	已过时。 This change is effective since API version 6. Replaced by setLayoutRefreshedListener(Component.LayoutRefreshedListener) with the null listener value.
void	removeWindowBoundListener(ComponentTreeObserver.WindowBoundListener listener)	Removes a listener registered for windowAttached().
void	removeWindowFocusUpdatedListener(ComponentTreeObserver.WindowFocusUpdatedListener listener)	Removes a listener registered for windowFocusUpdated().

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

addWindowFocusUpdatedListener

public void addWindowFocusUpdatedListener(ComponentTreeObserver.WindowFocusUpdatedListener listener)

Registers a listener for windowFocusUpdated().

参数:

listener - Indicates the listener to register.

从以下版本开始:

4

removeWindowFocusUpdatedListener

public void removeWindowFocusUpdatedListener(ComponentTreeObserver.WindowFocusUpdatedListener listener)

Removes a listener registered for windowFocusUpdated().

参数:

listener - Indicates the listener to remove.

从以下版本开始:

4

addWindowBoundListener

public void addWindowBoundListener(ComponentTreeObserver.WindowBoundListener listener)

Registers a listener for windowBound().

参数:

listener - Indicates the listener to register.

从以下版本开始:

4

removeWindowBoundListener

public void removeWindowBoundListener(ComponentTreeObserver.WindowBoundListener listener)

Removes a listener registered for windowAttached().

参数:

listener - Indicates the listener to remove.

从以下版本开始:

4

addScrolledListener

public void addScrolledListener(ComponentTreeObserver.ScrollChangedListener listener)

Registers a listener for scrollChanged().

参数:

listener - Indicates the listener to register.

从以下版本开始:

4

removeScrolledListener

public void removeScrolledListener(ComponentTreeObserver.ScrollChangedListener listener)

Removes a listener registered for scrollChanged().

参数:

listener - Indicates the listener to remove.

从以下版本开始:

4

addGlobalFocusUpdatedListener

public void addGlobalFocusUpdatedListener(ComponentTreeObserver.GlobalFocusUpdatedListener listener)

Registers a listener for globalFocusChanged().

参数:

listener - Indicates the listener to register.

从以下版本开始:

4

removeGlobalFocusUpdatedListener

public void removeGlobalFocusUpdatedListener(ComponentTreeObserver.GlobalFocusUpdatedListener listener)

Removes a listener registered for globalFocusChanged().

参数:

listener - Indicates the listener to remove.

从以下版本开始:

4

addTreeLayoutChangedListener

@Deprecated
public void addTreeLayoutChangedListener(ComponentTreeObserver.GlobalLayoutListener listener)

已过时。 This change is effective since API version 6. Replaced by setLayoutRefreshedListener(Component.LayoutRefreshedListener)

Registers a listener for globalLayoutChanged().

参数:

listener - Indicates the listener to register.

从以下版本开始:

5

removeTreeLayoutChangedListener

@Deprecated
public void removeTreeLayoutChangedListener(ComponentTreeObserver.GlobalLayoutListener listener)

已过时。 This change is effective since API version 6. Replaced by setLayoutRefreshedListener(Component.LayoutRefreshedListener) with the null listener value.

Removes a listener registered for globalLayoutChanged().

参数:

listener - Indicates the listener to remove.

从以下版本开始:

5