Example usage for com.google.gwt.event.logical.shared ValueChangeEvent shouldFire

Introduction

In this page you can find the example usage for com.google.gwt.event.logical.shared ValueChangeEvent shouldFire.

Prototype

protected static <T> boolean shouldFire(HasValueChangeHandlers<T> source, T oldValue, T newValue) 

Source Link

Document

Convenience method to allow subtypes to know when they should fire a value change event in a null-safe manner.

Usage

From source file:net.cbtltd.client.field.datepicker.DateChangeEvent.java

License:Apache License

/**
 * Fires value change event if the old value is not equal to the new value.
 * Use this call rather than making the decision to short circuit yourself for
 * safe handling of null.// w w w . j a  va  2 s .com
 * 
 * @param <I> the old value type
 * @param <S> The event source
 * @param source the source of the handlers
 * @param oldValue the oldValue, may be null
 * @param newValue the newValue, may be null
 */
public static <S extends HasValueChangeHandlers<Date> & HasHandlers> void fireIfNotEqualDates(S source,
        Date oldValue, Date newValue) {
    if (ValueChangeEvent.shouldFire(source, oldValue, newValue)) {
        source.fireEvent(new DateChangeEvent(newValue));
    }
}

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From source file:org.cruxframework.crux.widgets.client.datepicker.GWTOverriddenDateChangeEvent.java

License:Apache License

/**
 * Fires value change event if the old value is not equal to the new value.
 * Use this call rather than making the decision to short circuit yourself for
 * safe handling of null.//from   w  w w.ja  v  a  2  s. com
 * 
 * @param <S> The event source
 * @param source the source of the handlers
 * @param oldValue the oldValue, may be null
 * @param newValue the newValue, may be null
 */
public static <S extends HasValueChangeHandlers<Date> & HasHandlers> void fireIfNotEqualDates(S source,
        Date oldValue, Date newValue) {
    if (ValueChangeEvent.shouldFire(source, oldValue, newValue)) {
        source.fireEvent(new GWTOverriddenDateChangeEvent(newValue));
    }
}

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