| com.google.gwt.user.client.ui.HasValue<T> |
 Known Indirect Subclasses
CellWidget<C>,
CheckBox,
DateBox,
DatePicker,
DoubleBox,
HasConstrainedValue<T>,
IntegerBox,
LongBox,
PasswordTextBox,
RadioButton,
SuggestBox,
TextArea,
TextBox,
TextBoxBase,
ToggleButton,
ValueBox<T>,
ValueBoxBase<T>,
ValueListBox<T>,
ValuePicker<T>
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Class Overview
Extends TakesValue to allow the value to be pulled back out, and to
throw ValueChangeEvent events.
An object that implements this interface should be a user input widget, where the user and programmer can both set and get the object's value. It is intended to provide a unified interface to widgets with "atomic" values, like Strings and Dates.
Summary
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Gets this object's value.
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Sets this object's value.
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Sets this object's value without firing any events.
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[Expand]
Inherited Methods | |||||||||||
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From interface
com.google.gwt.event.logical.shared.HasValueChangeHandlers
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From interface
com.google.gwt.event.shared.HasHandlers
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From interface
com.google.gwt.user.client.TakesValue
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Public Methods
public abstract T getValue ()
Gets this object's value.
Returns
- the object's value
public abstract void setValue (T value, boolean fireEvents)
Sets this object's value. Fires
ValueChangeEvent when
fireEvents is true and the new value does not equal the existing value.
It is acceptable to fail assertions or throw (documented) unchecked exceptions in response to bad values.
Parameters
| value | the object's new value |
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| fireEvents | fire events if true and value is new |
public abstract void setValue (T value)
Sets this object's value without firing any events. This should be identical to calling setValue(value, false).
It is acceptable to fail assertions or throw (documented) unchecked exceptions in response to bad values.
Widgets must accept null as a valid value. By convention, setting a widget to
null clears value, calling getValue() on a cleared widget returns null. Widgets
that can not be cleared (e.g. CheckBox) must find another valid meaning
for null input.
Parameters
| value | the object's new value |
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