com.actionbarsherlock.internal.widget

Class PopupWindowCompat

java.lang.Object

android.widget.PopupWindow

com.actionbarsherlock.internal.widget.PopupWindowCompat

public class PopupWindowCompat
extends android.widget.PopupWindow

Works around bugs in the handling of ViewTreeObserver by PopupWindow.

PopupWindow registers an ViewTreeObserver.OnScrollChangedListener with ViewTreeObserver, but does not keep a reference to the observer instance that it has registers on. This is problematic when the anchor view used by PopupWindow to access the observer is detached from the window, as it will revert from the shared ViewTreeObserver owned by the ViewRoot to a floating one, meaning PopupWindow cannot unregister it's listener anymore and has leaked it into the global observer.

This class works around this issue by

• replacing PopupWindow.mOnScrollChangedListener with a no-op listener so that any registration or unregistration performed by PopupWindow itself has no effect and causes no leaks.
• registering the real listener only with the shared ViewTreeObserver and keeping a reference to it to facilitate correct unregistration. The reason for not registering on a floating observer (before a view is attached) is that there is no safe way to get a reference to the shared observer that the floating one will be merged into. This would again cause the listener to leak.

Nested Class Summary

Nested classes/interfaces inherited from class android.widget.PopupWindow

android.widget.PopupWindow.OnDismissListener

Field Summary

Fields inherited from class android.widget.PopupWindow

INPUT_METHOD_FROM_FOCUSABLE, INPUT_METHOD_NEEDED, INPUT_METHOD_NOT_NEEDED

Constructor Summary

Constructors

Constructor and Description
PopupWindowCompat()
PopupWindowCompat(android.content.Context context)
PopupWindowCompat(android.content.Context context, android.util.AttributeSet attrs)
PopupWindowCompat(android.content.Context context, android.util.AttributeSet attrs, int defStyle)
PopupWindowCompat(android.content.Context context, android.util.AttributeSet attrs, int defStyleAttr, int defStyleRes)
PopupWindowCompat(int width, int height)
PopupWindowCompat(android.view.View contentView)
PopupWindowCompat(android.view.View contentView, int width, int height)
PopupWindowCompat(android.view.View contentView, int width, int height, boolean focusable)

Method Summary

Methods

Modifier and Type	Method and Description
void	dismiss()
void	showAsDropDown(android.view.View anchor, int xoff, int yoff)
void	showAtLocation(android.view.View parent, int gravity, int x, int y)
void	update(android.view.View anchor, int width, int height)
void	update(android.view.View anchor, int xoff, int yoff, int width, int height)

Methods inherited from class android.widget.PopupWindow

getAnimationStyle, getBackground, getContentView, getHeight, getInputMethodMode, getMaxAvailableHeight, getMaxAvailableHeight, getSoftInputMode, getWidth, isAboveAnchor, isClippingEnabled, isFocusable, isOutsideTouchable, isShowing, isSplitTouchEnabled, isTouchable, setAnimationStyle, setBackgroundDrawable, setClippingEnabled, setContentView, setFocusable, setHeight, setIgnoreCheekPress, setInputMethodMode, setOnDismissListener, setOutsideTouchable, setSoftInputMode, setSplitTouchEnabled, setTouchable, setTouchInterceptor, setWidth, setWindowLayoutMode, showAsDropDown, update, update, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

PopupWindowCompat

public PopupWindowCompat()

PopupWindowCompat

public PopupWindowCompat(android.content.Context context)

PopupWindowCompat

public PopupWindowCompat(android.content.Context context,
                 android.util.AttributeSet attrs)

PopupWindowCompat

public PopupWindowCompat(android.content.Context context,
                 android.util.AttributeSet attrs,
                 int defStyle)

PopupWindowCompat

public PopupWindowCompat(android.content.Context context,
                 android.util.AttributeSet attrs,
                 int defStyleAttr,
                 int defStyleRes)

PopupWindowCompat

public PopupWindowCompat(int width,
                 int height)

PopupWindowCompat

public PopupWindowCompat(android.view.View contentView)

PopupWindowCompat

public PopupWindowCompat(android.view.View contentView,
                 int width,
                 int height,
                 boolean focusable)

PopupWindowCompat

public PopupWindowCompat(android.view.View contentView,
                 int width,
                 int height)

Method Detail

showAsDropDown

public void showAsDropDown(android.view.View anchor,
                  int xoff,
                  int yoff)

Overrides:

showAsDropDown in class android.widget.PopupWindow

update

public void update(android.view.View anchor,
          int xoff,
          int yoff,
          int width,
          int height)

Overrides:

update in class android.widget.PopupWindow

update

public void update(android.view.View anchor,
          int width,
          int height)

Overrides:

update in class android.widget.PopupWindow

showAtLocation

public void showAtLocation(android.view.View parent,
                  int gravity,
                  int x,
                  int y)

Overrides:

showAtLocation in class android.widget.PopupWindow

dismiss

public void dismiss()

Overrides:

dismiss in class android.widget.PopupWindow