org.gwt.advanced.client.ui.widget

Class ComboBox.ComboBoxKeyboardManager

java.lang.Object

org.gwt.advanced.client.ui.widget.ComboBox.ComboBoxKeyboardManager

All Implemented Interfaces:

com.google.gwt.event.shared.EventHandler, com.google.gwt.user.client.Event.NativePreviewHandler

Enclosing class:

ComboBox<T extends ListDataModel>

protected class ComboBox.ComboBoxKeyboardManager
extends Object
implements com.google.gwt.user.client.Event.NativePreviewHandler

This is a keyboard manager implementation developed for the widget.

It prevents default browser event handling for system keys like arrow up / down, escape, enter and tab. This manager is activated on widget focus and is used for opening / closing the drop down list and switching a cursor position in the list.

It also supports Shift+Tab combination but skips other modifiers.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ComboBox.ComboBoxKeyboardManager()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	cancelAndPrevent(com.google.gwt.user.client.Event.NativePreviewEvent event) This method cancels and prevents default actions of the specified event.
void	onPreviewNativeEvent(com.google.gwt.user.client.Event.NativePreviewEvent event) See class docs

Methods inherited from class java.lang.Object

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

Constructor Detail

ComboBox.ComboBoxKeyboardManager

protected ComboBox.ComboBoxKeyboardManager()

Method Detail

onPreviewNativeEvent

public void onPreviewNativeEvent(com.google.gwt.user.client.Event.NativePreviewEvent event)

See class docs

Specified by:

onPreviewNativeEvent in interface com.google.gwt.user.client.Event.NativePreviewHandler

cancelAndPrevent

protected void cancelAndPrevent(com.google.gwt.user.client.Event.NativePreviewEvent event)

This method cancels and prevents default actions of the specified event.

It's useful for stupid browsers like Opera.

Parameters:

event - is an event to cancel and prevent.