com.google.gwt.user.client.ui
Class AbstractNativeScrollbar

java.lang.Object
  com.google.gwt.user.client.ui.UIObject
      com.google.gwt.user.client.ui.Widget
          com.google.gwt.user.client.ui.AbstractNativeScrollbar

All Implemented Interfaces:

HasScrollHandlers, HasAttachHandlers, HasHandlers, EventListener, HasVisibility, IsWidget

Direct Known Subclasses:

NativeHorizontalScrollbar, NativeVerticalScrollbar

public abstract class AbstractNativeScrollbar
extends Widget
implements HasScrollHandlers

Abstract parent class for scrollbars implemented using the native browser scrollbars.

AbstractNativeScrollbar

public AbstractNativeScrollbar()

getNativeScrollbarHeight

public static int getNativeScrollbarHeight()

Get the height of a native horizontal scrollbar.

This method assumes that all native scrollbars on the page have the same height.

Returns:

the height in pixels

getNativeScrollbarWidth

public static int getNativeScrollbarWidth()

Get the width of a native vertical scrollbar.

This method assumes that all native vertical scrollbars on the page have the same width.

Returns:

the height in pixels

isScrollbarLeftAlignedInRtl

public static boolean isScrollbarLeftAlignedInRtl()

Check whether or not the native vertical scrollbar is aligned on the left side of the scrollable element in RTL mode.

Returns:

true if left aligned, false if not

addScrollHandler

public HandlerRegistration addScrollHandler(ScrollHandler handler)

Description copied from interface: HasScrollHandlers

Adds a ScrollEvent handler.

Specified by:

addScrollHandler in interface HasScrollHandlers

Parameters:

handler - the scroll handler

Returns:

HandlerRegistration used to remove this handler

getScrollableElement

protected abstract Element getScrollableElement()

Get the scrollable element.

Returns:

the scrollable element

onAttach

protected void onAttach()

Description copied from class: Widget

This method is called when a widget is attached to the browser's document. To receive notification after a Widget has been added to the document, override the Widget.onLoad() method or use Widget.addAttachHandler(com.google.gwt.event.logical.shared.AttachEvent.Handler).

It is strongly recommended that you override Widget.onLoad() or Widget.doAttachChildren() instead of this method to avoid inconsistencies between logical and physical attachment states.

Subclasses that override this method must call super.onAttach() to ensure that the Widget has been attached to its underlying Element.

Overrides:

onAttach in class Widget

See Also:

Widget.onLoad(), Widget.doAttachChildren()

onDetach

protected void onDetach()

Description copied from class: Widget

This method is called when a widget is detached from the browser's document. To receive notification before a Widget is removed from the document, override the Widget.onUnload() method or use Widget.addAttachHandler(com.google.gwt.event.logical.shared.AttachEvent.Handler).

It is strongly recommended that you override Widget.onUnload() or Widget.doDetachChildren() instead of this method to avoid inconsistencies between logical and physical attachment states.

Subclasses that override this method must call super.onDetach() to ensure that the Widget has been detached from the underlying Element. Failure to do so will result in application memory leaks due to circular references between DOM Elements and JavaScript objects.

Overrides:

onDetach in class Widget

See Also:

Widget.onUnload(), Widget.doDetachChildren()