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Eclipse Platform
Release 3.5

org.eclipse.jface.viewers
Class CellEditor

java.lang.Object
  extended by 
org.eclipse.jface.viewers.CellEditor
Direct Known Subclasses:
CheckboxCellEditor, ComboBoxCellEditor, ComboBoxViewerCellEditor, DialogCellEditor, TextCellEditor

public abstract class CellEditor
extends Object

Abstract base class for cell editors. Implements property change listener handling, and SWT window management.

Subclasses implement particular kinds of cell editors. This package contains various specialized cell editors:

  • TextCellEditor - for simple text strings
  • ColorCellEditor - for colors
  • ComboBoxCellEditor - value selected from drop-down combo box
  • CheckboxCellEditor - boolean valued checkbox
  • DialogCellEditor - value from arbitrary dialog


Nested Class Summary
static class CellEditor.LayoutData
          Struct-like layout data for cell editors, with reasonable defaults for all fields.
 
Field Summary
static  String COPY
          Property name for the copy action
static  String CUT
          Property name for the cut action
static  String DELETE
          Property name for the delete action
static  String FIND
          Property name for the find action
static  String PASTE
          Property name for the paste action
static  String REDO
          Property name for the redo action
static  String SELECT_ALL
          Property name for the select all action
static  String UNDO
          Property name for the undo action
 
Constructor Summary
protected CellEditor ()
          Creates a new cell editor with no control The cell editor has no cell validator.
protected CellEditor ( Composite parent)
          Creates a new cell editor under the given parent control.
protected CellEditor ( Composite parent, int style)
          Creates a new cell editor under the given parent control.
 
Method Summary
 void activate ()
          Activates this cell editor.
 void activate ( ColumnViewerEditorActivationEvent activationEvent)
          Activate the editor but also inform the editor which event triggered its activation.
 void addListener ( ICellEditorListener listener)
          Adds a listener to this cell editor.
 void addPropertyChangeListener ( IPropertyChangeListener listener)
          Adds a property change listener to this cell editor.
 void create ( Composite parent)
          Creates the control for this cell editor under the given parent control.
protected abstract   Control createControl ( Composite parent)
          Creates the control for this cell editor under the given parent control.
 void deactivate ()
          Hides this cell editor's control.
protected  void deactivate ( ColumnViewerEditorDeactivationEvent event)
           
protected  boolean dependsOnExternalFocusListener ()
          The default implementation of this method returns true.
 void dispose ()
          Disposes of this cell editor and frees any associated SWT resources.
protected abstract   Object doGetValue ()
          Returns this cell editor's value.
protected abstract  void doSetFocus ()
          Sets the focus to the cell editor's control.
protected abstract  void doSetValue ( Object value)
          Sets this cell editor's value.
protected  void fireApplyEditorValue ()
          Notifies all registered cell editor listeners of an apply event.
protected  void fireCancelEditor ()
          Notifies all registered cell editor listeners that editing has been canceled.
protected  void fireEditorValueChanged (boolean oldValidState, boolean newValidState)
          Notifies all registered cell editor listeners of a value change.
protected  void fireEnablementChanged ( String actionId)
          Notifies all registered property listeners of an enablement change.
protected  void focusLost ()
          Processes a focus lost event that occurred in this cell editor.
  Control getControl ()
          Returns the control used to implement this cell editor.
protected  int getDoubleClickTimeout ()
          Returns the duration, in milliseconds, between the mouse button click that activates the cell editor and a subsequent mouse button click that will be considered a double click on the underlying control.
  String getErrorMessage ()
          Returns the current error message for this cell editor.
  CellEditor.LayoutData getLayoutData ()
          Returns a layout data object for this cell editor.
 int getStyle ()
          Returns the style bits for this cell editor.
  ICellEditorValidator getValidator ()
          Returns the input validator for this cell editor.
  Object getValue ()
          Returns this cell editor's value provided that it has a valid one.
 boolean isActivated ()
          Returns whether this cell editor is activated.
 boolean isCopyEnabled ()
          Returns true if this cell editor is able to perform the copy action.
protected  boolean isCorrect ( Object value)
          Returns whether the given value is valid for this cell editor.
 boolean isCutEnabled ()
          Returns true if this cell editor is able to perform the cut action.
 boolean isDeleteEnabled ()
          Returns true if this cell editor is able to perform the delete action.
 boolean isDirty ()
          Returns whether the value of this cell editor has changed since the last call to setValue.
 boolean isFindEnabled ()
          Returns true if this cell editor is able to perform the find action.
 boolean isPasteEnabled ()
          Returns true if this cell editor is able to perform the paste action.
 boolean isRedoEnabled ()
          Returns true if this cell editor is able to perform the redo action.
 boolean isSelectAllEnabled ()
          Returns true if this cell editor is able to perform the select all action.
 boolean isUndoEnabled ()
          Returns true if this cell editor is able to perform the undo action.
 boolean isValueValid ()
          Returns whether this cell editor has a valid value.
protected  void keyReleaseOccured ( KeyEvent keyEvent)
          Processes a key release event that occurred in this cell editor.
protected  void markDirty ()
          Marks this cell editor as dirty.
 void performCopy ()
          Performs the copy action.
 void performCut ()
          Performs the cut action.
 void performDelete ()
          Performs the delete action.
 void performFind ()
          Performs the find action.
 void performPaste ()
          Performs the paste action.
 void performRedo ()
          Performs the redo action.
 void performSelectAll ()
          Performs the select all action.
 void performUndo ()
          Performs the undo action.
 void removeListener ( ICellEditorListener listener)
          Removes the given listener from this cell editor.
 void removePropertyChangeListener ( IPropertyChangeListener listener)
          Removes the given property change listener from this cell editor.
protected  void setErrorMessage ( String message)
          Sets or clears the current error message for this cell editor.
 void setFocus ()
          Sets the focus to the cell editor's control.
 void setStyle (int style)
          Sets the style bits for this cell editor.
 void setValidator ( ICellEditorValidator validator)
          Sets the input validator for this cell editor.
 void setValue ( Object value)
          Sets this cell editor's value.
protected  void setValueValid (boolean valid)
          Sets the valid state of this cell editor.
protected  void valueChanged (boolean oldValidState, boolean newValidState)
          The value has changed.
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

COPY

public static final 
String COPY
Property name for the copy action

See Also:
Constant Field Values

CUT

public static final 
String CUT
Property name for the cut action

See Also:
Constant Field Values

DELETE

public static final 
String DELETE
Property name for the delete action

See Also:
Constant Field Values

FIND

public static final 
String FIND
Property name for the find action

See Also:
Constant Field Values

PASTE

public static final 
String PASTE
Property name for the paste action

See Also:
Constant Field Values

REDO

public static final 
String REDO
Property name for the redo action

See Also:
Constant Field Values

SELECT_ALL

public static final 
String SELECT_ALL
Property name for the select all action

See Also:
Constant Field Values

UNDO

public static final 
String UNDO
Property name for the undo action

See Also:
Constant Field Values
Constructor Detail

CellEditor

protected CellEditor()
Creates a new cell editor with no control The cell editor has no cell validator.

Since:
2.1

CellEditor

protected CellEditor(
Composite parent)
Creates a new cell editor under the given parent control. The cell editor has no cell validator.

Parameters:
parent - the parent control

CellEditor

protected CellEditor(
Composite parent,
                     int style)
Creates a new cell editor under the given parent control. The cell editor has no cell validator.

Parameters:
parent - the parent control
style - the style bits
Since:
2.1
Method Detail

activate

public void activate()
Activates this cell editor.

The default implementation of this framework method does nothing. Subclasses may reimplement.


addListener

public void addListener(
ICellEditorListener listener)
Adds a listener to this cell editor. Has no effect if an identical listener is already registered.

Parameters:
listener - a cell editor listener

addPropertyChangeListener

public void addPropertyChangeListener(
IPropertyChangeListener listener)
Adds a property change listener to this cell editor. Has no effect if an identical property change listener is already registered.

Parameters:
listener - a property change listener

createControl

protected abstract 
Control createControl(
Composite parent)
Creates the control for this cell editor under the given parent control.

This framework method must be implemented by concrete subclasses.

Parameters:
parent - the parent control
Returns:
the new control, or null if this cell editor has no control

create

public void create(
Composite parent)
Creates the control for this cell editor under the given parent control.

Parameters:
parent - the parent control
Since:
2.1

deactivate

public void deactivate()
Hides this cell editor's control. Does nothing if this cell editor is not visible.


dispose

public void dispose()
Disposes of this cell editor and frees any associated SWT resources.


doGetValue

protected abstract 
Object doGetValue()
Returns this cell editor's value.

This framework method must be implemented by concrete subclasses.

Returns:
the value of this cell editor
See Also:
getValue()

doSetFocus

protected abstract void doSetFocus()
Sets the focus to the cell editor's control.

This framework method must be implemented by concrete subclasses.

See Also:
setFocus()

doSetValue

protected abstract void doSetValue(
Object value)
Sets this cell editor's value.

This framework method must be implemented by concrete subclasses.

Parameters:
value - the value of this cell editor
See Also:
setValue(java.lang.Object)

fireApplyEditorValue

protected void fireApplyEditorValue()
Notifies all registered cell editor listeners of an apply event. Only listeners registered at the time this method is called are notified.

See Also:
ICellEditorListener.applyEditorValue()

fireCancelEditor

protected void fireCancelEditor()
Notifies all registered cell editor listeners that editing has been canceled.

See Also:
ICellEditorListener.cancelEditor()

fireEditorValueChanged

protected void fireEditorValueChanged(boolean oldValidState,
                                      boolean newValidState)
Notifies all registered cell editor listeners of a value change.

Parameters:
oldValidState - the valid state before the end user changed the value
newValidState - the current valid state
See Also:
ICellEditorListener.editorValueChanged(boolean, boolean)

fireEnablementChanged

protected void fireEnablementChanged(
String actionId)
Notifies all registered property listeners of an enablement change.

Parameters:
actionId - the id indicating what action's enablement has changed.

setStyle

public void setStyle(int style)
Sets the style bits for this cell editor.

Parameters:
style - the SWT style bits for this cell editor
Since:
2.1

getStyle

public int getStyle()
Returns the style bits for this cell editor.

Returns:
the style for this cell editor
Since:
2.1

getControl

public 
Control getControl()
Returns the control used to implement this cell editor.

Returns:
the control, or null if this cell editor has no control

getErrorMessage

public 
String getErrorMessage()
Returns the current error message for this cell editor.

Returns:
the error message if the cell editor is in an invalid state, and null if the cell editor is valid

getLayoutData

public 
CellEditor.LayoutData getLayoutData()
Returns a layout data object for this cell editor. This is called each time the cell editor is activated and controls the layout of the SWT table editor.

The default implementation of this method sets the minimum width to the control's preferred width. Subclasses may extend or reimplement.

Returns:
the layout data object

getValidator

public 
ICellEditorValidator getValidator()
Returns the input validator for this cell editor.

Returns:
the input validator, or null if none

getValue

public final 
Object getValue()
Returns this cell editor's value provided that it has a valid one.

Returns:
the value of this cell editor, or null if the cell editor does not contain a valid value

isActivated

public boolean isActivated()
Returns whether this cell editor is activated.

Returns:
true if this cell editor's control is currently activated, and false if not activated

isCopyEnabled

public boolean isCopyEnabled()
Returns true if this cell editor is able to perform the copy action.

This default implementation always returns false.

Subclasses may override

Returns:
true if copy is possible, false otherwise

isCorrect

protected boolean isCorrect(
Object value)
Returns whether the given value is valid for this cell editor. This cell editor's validator (if any) makes the actual determination.

Parameters:
value - the value to check for
Returns:
true if the value is valid, and false if invalid

isCutEnabled

public boolean isCutEnabled()
Returns true if this cell editor is able to perform the cut action.

This default implementation always returns false.

Subclasses may override

Returns:
true if cut is possible, false otherwise

isDeleteEnabled

public boolean isDeleteEnabled()
Returns true if this cell editor is able to perform the delete action.

This default implementation always returns false.

Subclasses may override

Returns:
true if delete is possible, false otherwise

isDirty

public boolean isDirty()
Returns whether the value of this cell editor has changed since the last call to setValue.

Returns:
true if the value has changed, and false if unchanged

markDirty

protected void markDirty()
Marks this cell editor as dirty.

Since:
2.1

isFindEnabled

public boolean isFindEnabled()
Returns true if this cell editor is able to perform the find action.

This default implementation always returns false.

Subclasses may override

Returns:
true if find is possible, false otherwise

isPasteEnabled

public boolean isPasteEnabled()
Returns true if this cell editor is able to perform the paste action.

This default implementation always returns false.

Subclasses may override

Returns:
true if paste is possible, false otherwise

isRedoEnabled

public boolean isRedoEnabled()
Returns true if this cell editor is able to perform the redo action.

This default implementation always returns false.

Subclasses may override

Returns:
true if redo is possible, false otherwise

isSelectAllEnabled

public boolean isSelectAllEnabled()
Returns true if this cell editor is able to perform the select all action.

This default implementation always returns false.

Subclasses may override

Returns:
true if select all is possible, false otherwise

isUndoEnabled

public boolean isUndoEnabled()
Returns true if this cell editor is able to perform the undo action.

This default implementation always returns false.

Subclasses may override

Returns:
true if undo is possible, false otherwise

isValueValid

public boolean isValueValid()
Returns whether this cell editor has a valid value. The default value is false.

Returns:
true if the value is valid, and false if invalid
See Also:
setValueValid(boolean)

keyReleaseOccured

protected void keyReleaseOccured(
KeyEvent keyEvent)
Processes a key release event that occurred in this cell editor.

The default implementation of this framework method cancels editing when the ESC key is pressed. When the RETURN key is pressed the current value is applied and the cell editor deactivates. Subclasses should call this method at appropriate times. Subclasses may also extend or reimplement.

Parameters:
keyEvent - the key event

focusLost

protected void focusLost()
Processes a focus lost event that occurred in this cell editor.

The default implementation of this framework method applies the current value and deactivates the cell editor. Subclasses should call this method at appropriate times. Subclasses may also extend or reimplement.


performCopy

public void performCopy()
Performs the copy action. This default implementation does nothing.

Subclasses may override


performCut

public void performCut()
Performs the cut action. This default implementation does nothing.

Subclasses may override


performDelete

public void performDelete()
Performs the delete action. This default implementation does nothing.

Subclasses may override


performFind

public void performFind()
Performs the find action. This default implementation does nothing.

Subclasses may override


performPaste

public void performPaste()
Performs the paste action. This default implementation does nothing.

Subclasses may override


performRedo

public void performRedo()
Performs the redo action. This default implementation does nothing.

Subclasses may override


performSelectAll

public void performSelectAll()
Performs the select all action. This default implementation does nothing.

Subclasses may override


performUndo

public void performUndo()
Performs the undo action. This default implementation does nothing.

Subclasses may override


removeListener

public void removeListener(
ICellEditorListener listener)
Removes the given listener from this cell editor. Has no affect if an identical listener is not registered.

Parameters:
listener - a cell editor listener

removePropertyChangeListener

public void removePropertyChangeListener(
IPropertyChangeListener listener)
Removes the given property change listener from this cell editor. Has no affect if an identical property change listener is not registered.

Parameters:
listener - a property change listener

setErrorMessage

protected void setErrorMessage(
String message)
Sets or clears the current error message for this cell editor.

No formatting is done here, the message to be set is expected to be fully formatted before being passed in.

Parameters:
message - the error message, or null to clear

setFocus

public void setFocus()
Sets the focus to the cell editor's control.


setValidator

public void setValidator(
ICellEditorValidator validator)
Sets the input validator for this cell editor.

Parameters:
validator - the input validator, or null if none

setValue

public final void setValue(
Object value)
Sets this cell editor's value.

Parameters:
value - the value of this cell editor

setValueValid

protected void setValueValid(boolean valid)
Sets the valid state of this cell editor. The default value is false. Subclasses should call this method on construction.

Parameters:
valid - true if the current value is valid, and false if invalid
See Also:
isValueValid()

valueChanged

protected void valueChanged(boolean oldValidState,
                            boolean newValidState)
The value has changed. Updates the valid state flag, marks this cell editor as dirty, and notifies all registered cell editor listeners of a value change.

Parameters:
oldValidState - the valid state before the end user changed the value
newValidState - the current valid state
See Also:
ICellEditorListener.editorValueChanged(boolean, boolean)

activate

public void activate(
ColumnViewerEditorActivationEvent activationEvent)
Activate the editor but also inform the editor which event triggered its activation. The default implementation simply calls activate()

Parameters:
activationEvent - the editor activation event
Since:
3.3

dependsOnExternalFocusListener

protected boolean dependsOnExternalFocusListener()
The default implementation of this method returns true. Subclasses that hook their own focus listener should override this method and return false. See also bug 58777.

Returns:
true to indicate that a focus listener has to be attached
Since:
3.4

deactivate

protected void deactivate(
ColumnViewerEditorDeactivationEvent event)
Parameters:
event - deactivation event
Since:
3.4

getDoubleClickTimeout

protected int getDoubleClickTimeout()
Returns the duration, in milliseconds, between the mouse button click that activates the cell editor and a subsequent mouse button click that will be considered a double click on the underlying control. Clients may override, in particular, clients can return 0 to denote that two subsequent mouse clicks in a cell should not be interpreted as a double click.

Returns:
the timeout or 0
Since:
3.4

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
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