Package org.eclipse.jface.databinding.viewers

Class ObservableValueEditingSupport<E,M,T>

java.lang.Object

org.eclipse.jface.viewers.EditingSupport

org.eclipse.jface.databinding.viewers.ObservableValueEditingSupport<E,M,T>

Type Parameters:

E - type of the model element with a property that is being edited

M - type of the value in the model that is being edited, the value of the property on the model element

T - type of the target value that actually is being edited by the user

public abstract class ObservableValueEditingSupport<E,M,T>
extends EditingSupport

EditingSupport using the JFace Data Binding concepts to handle the updating of an element from a CellEditor.

If M and T are different then they must be converted to each other.

Since:

1.2

Constructor Summary

Constructors

Constructor	Description
ObservableValueEditingSupport(ColumnViewer viewer, DataBindingContext dataBindingContext)	Constructs a new instance with the provided viewer and dataBindingContext

Method Summary

Modifier and Type	Method	Description
protected boolean	canEdit(Object element)	Default implementation always returns true.
static <E, M, T> EditingSupport	create(ColumnViewer viewer, DataBindingContext dataBindingContext, CellEditor cellEditor, IValueProperty<? super CellEditor,T> cellEditorProperty, IValueProperty<E,M> elementProperty)	Returns an ObservableValueEditingSupport instance which binds the given cell editor property to the given element property.
protected Binding	createBinding(IObservableValue<T> target, IObservableValue<M> model)	Creates a new binding for the provided target and model.
protected abstract IObservableValue<T>	doCreateCellEditorObservable(CellEditor cellEditor)	Creates the observable value for the CellEditor.
protected abstract IObservableValue<M>	doCreateElementObservable(E element, ViewerCell cell)	Creates the observable value for the element.
protected final DataBindingContext	getDataBindingContext()
protected Object	getValue(Object element)	Default implementation always returns null as this will be handled by the Binding.
protected final void	initializeCellEditorValue(CellEditor cellEditor, ViewerCell cell)	Creates a Binding between the editor and the element to be edited.
protected final void	saveCellEditorValue(CellEditor cellEditor, ViewerCell cell)	Updates the model from the target.
protected void	setValue(Object element, Object value)	Default implementation does nothing as this will be handled by the Binding.

Methods inherited from class org.eclipse.jface.viewers.EditingSupport

getCellEditor, getViewer

Methods inherited from class java.lang.Object

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

Constructor Details

ObservableValueEditingSupport

public ObservableValueEditingSupport(ColumnViewer viewer,
 DataBindingContext dataBindingContext)

Constructs a new instance with the provided viewer and dataBindingContext

Parameters:

viewer - viewer to edit

dataBindingContext - used to create Bindings

Method Details

create

public static <E,
M,
T> EditingSupport create(ColumnViewer viewer,
 DataBindingContext dataBindingContext,
 CellEditor cellEditor,
 IValueProperty<? super CellEditor,T> cellEditorProperty,
 IValueProperty<E,M> elementProperty)

Returns an ObservableValueEditingSupport instance which binds the given cell editor property to the given element property.

Parameters:

viewer - the column viewer

dataBindingContext - the DataBindingContext used for binding between the cell editor and the viewer element.

cellEditor - the cell editor

cellEditorProperty - the cell editor property to be bound to the element.

elementProperty - the element property to be bound to the cell editor.

Returns:

an ObservableValueEditingSupport instance using the given arguments.

Since:

1.3

canEdit

protected boolean canEdit(Object element)

Default implementation always returns true.

Specified by:

canEdit in class EditingSupport

Parameters:

element - the model element

Returns:

true if editable

See Also:

• EditingSupport.canEdit(java.lang.Object)

getValue

protected Object getValue(Object element)

Default implementation always returns null as this will be handled by the Binding.

Specified by:

getValue in class EditingSupport

Parameters:

element - the model element

Returns:

the value shown

See Also:

• EditingSupport.getValue(java.lang.Object)

setValue

protected void setValue(Object element,
 Object value)

Default implementation does nothing as this will be handled by the Binding.

Specified by:

setValue in class EditingSupport

Parameters:

element - the model element

value - the new value

See Also:

• EditingSupport.setValue(java.lang.Object, java.lang.Object)

initializeCellEditorValue

protected final void initializeCellEditorValue(CellEditor cellEditor,
 ViewerCell cell)

Creates a Binding between the editor and the element to be edited. Invokes doCreateCellEditorObservable(CellEditor), doCreateElementObservable(Object, ViewerCell), and then createBinding(IObservableValue, IObservableValue).

Overrides:

initializeCellEditorValue in class EditingSupport

Parameters:

cellEditor - the cell editor

cell - the cell the editor is working for

doCreateCellEditorObservable

protected abstract IObservableValue<T> doCreateCellEditorObservable(CellEditor cellEditor)

Creates the observable value for the CellEditor.

Parameters:

cellEditor - editor to create observable for

Returns:

observable value

doCreateElementObservable

protected abstract IObservableValue<M> doCreateElementObservable(E element,
 ViewerCell cell)

Creates the observable value for the element.

Parameters:

element - element to create observable for

cell - elements viewer cell

Returns:

observable value

getDataBindingContext

protected final DataBindingContext getDataBindingContext()

Returns:

the DataBindingContext that was used when creating this object.

Since:

1.11

createBinding

protected Binding createBinding(IObservableValue<T> target,
 IObservableValue<M> model)

Creates a new binding for the provided target and model. Default value update strategies are used with the target to model updating on UpdateValueStrategy.POLICY_CONVERT.

Parameters:

target - the target

model - the model

Returns:

binding created binding

saveCellEditorValue

protected final void saveCellEditorValue(CellEditor cellEditor,
 ViewerCell cell)

Updates the model from the target.

Overrides:

saveCellEditorValue in class EditingSupport

Parameters:

cellEditor - the cell-editor

cell - the cell the editor is working for