Class LocalDateTimeObservableValue
- All Implemented Interfaces:
IObservable
,IObservableValue<LocalDateTime>
IObservableValue
<LocalDateTime
> which supports
scenarios where the date and time are presented as separate elements in the
user interface. This class combines the year, month, and day portion of the
date observable (an IObservableValue
<LocalDate
>) and
the hour, minute, second, and millisecond portion of the time observable
(also an IObservableValue
<LocalTime
>).
This observable's value will be null whenever the date observable's value is null. Otherwise the value is the combination of the date portion of the date observable and the time portion of the time observable (a time observable value of null is treated the same as 0:00:00.000).
When setting the value of this observable, setting a null value will set null on the date observable, and set a time of 0:00:00.000 on the time observable. When setting non-null values, the non-applicable fields of each observable are left intact. That is, the hour, minute, second and millisecond components of the date observable are preserved, and the year, month and day components of the time observable are preserved.
The observables used for the date and time component may impose their own restrictions with regard to supported values. For example some observables do not allow a null value, because the underlying widget lacks support for a null value (example: DateTime).
One use for this class is binding a date-and-time value to two separate user interface elements, one for editing date and one for editing time:
DataBindingContext bindingContext = new DataBindingContext();
IObservableValue<LocalDateTime> beanValue = BeansObservables.observeValue(...);
IObservableValue<LocalDate> dateObservable = WidgetProperties.localDateSelection().observe(dateWidget);
IObservableValue<LocalTime> timeObservable = WidgetProperties.localTimeSelection().observe(timeWidget);
bindingContext.bindValue(new LocalDateTimeObservableValue(dateObservable, timeObservable), beanValue);
A second use is editing only the date or time value of a date-and-time value.
This can be accomplished by using a widget-specific observable for the
editable value and a WritableValue
as a container for the fixed
value. The example below allows editing the date while preserving the time:
DataBindingContext bindingContext = new DataBindingContext();
IObservableValue<LocalDateTime> beanValue = BeansObservables.observeValue(...);
IObservableValue<LocalDate> dateObservable = WidgetProperties.localDateSelection().observe(dateWidget);
IObservableValue<LocalTime> timeObservable = new WritableValue<>(dateObservable.getRealm(),
beanValue.getValue(), LocalTime.class);
bindingContext.bindValue(new LocalDateTimeObservableValue(dateObservable, timeObservable), beanValue);
- Since:
- 1.10
-
Constructor Summary
ConstructorDescriptionLocalDateTimeObservableValue
(IObservableValue<LocalDate> dateObservable, IObservableValue<LocalTime> timeObservable) Constructs a DateAndTimeObservableValue with the specified constituent observables. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
addListener
(Object listenerType, IObservablesListener listener) protected Object
clone()
void
dispose()
Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.protected LocalDateTime
protected void
doSetValue
(LocalDateTime combined) Template method for setting the value of the observable.protected void
fireEvent
(ObservableEvent event) protected void
getRealm()
The value type of this observable value, ornull
if this observable value is untyped.protected boolean
boolean
isStale()
Returns whether the state of this observable is stale and is expected to change soon.protected void
protected void
removeListener
(Object listenerType, IObservablesListener listener) Methods inherited from class org.eclipse.core.databinding.observable.value.AbstractObservableValue
addValueChangeListener, fireChange, fireValueChange, getValue, removeValueChangeListener, setValue
Methods inherited from class org.eclipse.core.databinding.observable.AbstractObservable
addChangeListener, addDisposeListener, addStaleListener, checkRealm, fireStale, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.eclipse.core.databinding.observable.IObservable
addChangeListener, addDisposeListener, addStaleListener, getRealm, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
-
Constructor Details
-
LocalDateTimeObservableValue
public LocalDateTimeObservableValue(IObservableValue<LocalDate> dateObservable, IObservableValue<LocalTime> timeObservable) Constructs a DateAndTimeObservableValue with the specified constituent observables.- Parameters:
dateObservable
- the observable used for the date component (year, month and day) of the constructed observable.timeObservable
- the observable used for the time component (hour, minute, second and millisecond) of the constructed observable.
-
-
Method Details
-
getValueType
Description copied from interface:IObservableValue
The value type of this observable value, ornull
if this observable value is untyped.- Returns:
- the value type, or
null
-
firstListenerAdded
protected void firstListenerAdded() -
lastListenerRemoved
protected void lastListenerRemoved() -
doGetValue
- Specified by:
doGetValue
in classAbstractObservableValue<LocalDateTime>
-
doSetValue
Description copied from class:AbstractObservableValue
Template method for setting the value of the observable. By default the method throws anUnsupportedOperationException
.- Overrides:
doSetValue
in classAbstractObservableValue<LocalDateTime>
- Parameters:
combined
- the value to set
-
isStale
public boolean isStale()Description copied from interface:IObservable
Returns whether the state of this observable is stale and is expected to change soon. A non-stale observable that becomes stale will notify its stale listeners. A stale object that becomes non-stale does so by changing its state and notifying its change listeners, it does not notify its stale listeners about becoming non-stale. Clients that do not expect asynchronous changes may ignore staleness of observable objects.- Specified by:
isStale
in interfaceIObservable
- Overrides:
isStale
in classAbstractObservableValue<LocalDateTime>
- Returns:
- true if this observable's state is stale and will change soon.
-
dispose
public void dispose()Description copied from interface:IObservable
Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.- Specified by:
dispose
in interfaceIObservable
- Overrides:
dispose
in classAbstractObservable
-
addListener
- Parameters:
listenerType
- arbitrary object to identify a type of the listenerlistener
- the listener to add; notnull
-
removeListener
- Parameters:
listenerType
- arbitrary object to identify a type of the listenerlistener
- the listener to remove; notnull
-
hasListeners
protected boolean hasListeners() -
fireEvent
-
getRealm
- Returns:
- Returns the realm.
-
clone
- Overrides:
clone
in classObject
- Throws:
CloneNotSupportedException
-