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Class DefaultTreeCellEditor

java.lang.Object

javax.swing.tree.DefaultTreeCellEditor

All Implemented Interfaces:: ActionListener, EventListener, CellEditor, TreeSelectionListener, TreeCellEditor

public class DefaultTreeCellEditor extends Object implements ActionListener, TreeCellEditor, TreeSelectionListener

A TreeCellEditor. You need to supply an instance of DefaultTreeCellRenderer so that the icons can be obtained. You can optionally supply a TreeCellEditor that will be laid out according to the icon in the DefaultTreeCellRenderer. If you do not supply a TreeCellEditor, a TextField will be used. Editing is started on a triple mouse click, or after a click, pause, click and a delay of 1200 milliseconds.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

Nested Class Summary

Modifier and Type	Class	Description
`class`	`DefaultTreeCellEditor.DefaultTextField`	`TextField` used when no editor is supplied.
`class`	`DefaultTreeCellEditor.EditorContainer`	Container responsible for placing the `editingComponent`.

Field Summary

Modifier and Type	Field	Description
`protected Color`	`borderSelectionColor`	True if the border selection color should be drawn.
`protected boolean`	`canEdit`	As of Java 2 platform v1.4 this field should no longer be used.
`protected Component`	`editingComponent`	Component used in editing, obtained from the `editingContainer`.
`protected Container`	`editingContainer`	Editing container, will contain the `editorComponent`.
`protected Icon`	`editingIcon`	Icon to use when editing.
`protected Font`	`font`	Font to paint with, `null` indicates font of renderer is to be used.
`protected TreePath`	`lastPath`	Last path that was selected.
`protected int`	`lastRow`	Row that was last passed into `getTreeCellEditorComponent`.
`protected int`	`offset`	Used in editing.
`protected TreeCellEditor`	`realEditor`	Editor handling the editing.
`protected DefaultTreeCellRenderer`	`renderer`	Renderer, used to get border and offsets from.
`protected Timer`	`timer`	Used before starting the editing session.
`protected JTree`	`tree`	`JTree` instance listening too.

Constructor Summary

Constructor	Description
`DefaultTreeCellEditor(JTree tree, DefaultTreeCellRenderer renderer)`	Constructs a `DefaultTreeCellEditor` object for a JTree using the specified renderer and a default editor.
`DefaultTreeCellEditor(JTree tree, DefaultTreeCellRenderer renderer, TreeCellEditor editor)`	Constructs a `DefaultTreeCellEditor` object for a `JTree` using the specified renderer and the specified editor.

Method Summary

Modifier and Type	Method	Description
`void`	`actionPerformed(ActionEvent e)`	Messaged when the timer fires, this will start the editing session.
`void`	`addCellEditorListener(CellEditorListener l)`	Adds the `CellEditorListener`.
`void`	`cancelCellEditing()`	Messages `cancelCellEditing` to the `realEditor` and removes it from this instance.
`protected boolean`	`canEditImmediately(EventObject event)`	Returns true if `event` is `null`, or it is a `MouseEvent` with a click count > 2 and `inHitRegion` returns true.
`protected Container`	`createContainer()`	Creates the container to manage placement of `editingComponent`.
`protected TreeCellEditor`	`createTreeCellEditor()`	This is invoked if a `TreeCellEditor` is not supplied in the constructor.
`protected void`	`determineOffset(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row)`	Determine the offset.
`Color`	`getBorderSelectionColor()`	Returns the color the border is drawn.
`CellEditorListener[]`	`getCellEditorListeners()`	Returns an array of all the `CellEditorListener`s added to this DefaultTreeCellEditor with addCellEditorListener().
`Object`	`getCellEditorValue()`	Returns the value currently being edited.
`Font`	`getFont()`	Gets the font used for editing.
`Component`	`getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row)`	Configures the editor.
`protected boolean`	`inHitRegion(int x, int y)`	Returns true if the passed in location is a valid mouse location to start editing from.
`boolean`	`isCellEditable(EventObject event)`	If the `realEditor` returns true to this message, `prepareForEditing` is messaged and true is returned.
`protected void`	`prepareForEditing()`	Invoked just before editing is to start.
`void`	`removeCellEditorListener(CellEditorListener l)`	Removes the previously added `CellEditorListener`.
`void`	`setBorderSelectionColor(Color newColor)`	Sets the color to use for the border.
`void`	`setFont(Font font)`	Sets the font to edit with.
`protected void`	`setTree(JTree newTree)`	Sets the tree currently editing for.
`boolean`	`shouldSelectCell(EventObject event)`	Messages the `realEditor` for the return value.
`protected boolean`	`shouldStartEditingTimer(EventObject event)`	Returns true if `event` is a `MouseEvent` and the click count is 1.
`protected void`	`startEditingTimer()`	Starts the editing timer.
`boolean`	`stopCellEditing()`	If the `realEditor` will allow editing to stop, the `realEditor` is removed and true is returned, otherwise false is returned.
`void`	`valueChanged(TreeSelectionEvent e)`	Resets `lastPath`.

Methods declared in class java.lang.Object

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

Field Details

realEditor

protected TreeCellEditor realEditor

Editor handling the editing.

renderer

protected DefaultTreeCellRenderer renderer

Renderer, used to get border and offsets from.

editingContainer

protected Container editingContainer

Editing container, will contain the editorComponent.

editingComponent

protected transient Component editingComponent

Component used in editing, obtained from the editingContainer.

canEdit

protected boolean canEdit

As of Java 2 platform v1.4 this field should no longer be used. If you wish to provide similar behavior you should directly override isCellEditable.

offset

protected transient int offset

Used in editing. Indicates x position to place editingComponent.

tree

protected transient JTree tree

JTree instance listening too.

lastPath

protected transient TreePath lastPath

Last path that was selected.

timer

protected transient Timer timer

Used before starting the editing session.

lastRow

protected transient int lastRow

Row that was last passed into getTreeCellEditorComponent.

borderSelectionColor

protected Color borderSelectionColor

True if the border selection color should be drawn.

editingIcon

protected transient Icon editingIcon

Icon to use when editing.

font

protected Font font

Font to paint with, null indicates font of renderer is to be used.

Constructor Details

DefaultTreeCellEditor

public DefaultTreeCellEditor(JTree tree, DefaultTreeCellRenderer renderer)

Constructs a DefaultTreeCellEditor object for a JTree using the specified renderer and a default editor. (Use this constructor for normal editing.)

Parameters:: tree - a JTree object; renderer - a DefaultTreeCellRenderer object

DefaultTreeCellEditor

public DefaultTreeCellEditor(JTree tree, DefaultTreeCellRenderer renderer, TreeCellEditor editor)

Constructs a DefaultTreeCellEditor object for a JTree using the specified renderer and the specified editor. (Use this constructor for specialized editing.)

Parameters:: tree - a JTree object; renderer - a DefaultTreeCellRenderer object; editor - a TreeCellEditor object

Method Details

setBorderSelectionColor

public void setBorderSelectionColor(Color newColor)

Sets the color to use for the border.

Parameters:: newColor - the new border color

getBorderSelectionColor

public Color getBorderSelectionColor()

Returns the color the border is drawn.

Returns:: the border selection color

setFont

public void setFont(Font font)

Sets the font to edit with. null indicates the renderers font should be used. This will NOT override any font you have set in the editor the receiver was instantiated with. If null for an editor was passed in a default editor will be created that will pick up this font.

Parameters:

font - the editing Font

See Also:

getFont

public Font getFont()

Gets the font used for editing.

Returns:

the editing Font

See Also:

getTreeCellEditorComponent

public Component getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row)

Configures the editor. Passed onto the realEditor.

Specified by:: getTreeCellEditorComponent in interface TreeCellEditor
Parameters:: tree - the JTree that is asking the editor to edit; this parameter can be null; value - the value of the cell to be edited; isSelected - true if the cell is to be rendered with selection highlighting; expanded - true if the node is expanded; leaf - true if the node is a leaf node; row - the row index of the node being edited
Returns:: the component for editing

getCellEditorValue

public Object getCellEditorValue()

Returns the value currently being edited.

Specified by:: getCellEditorValue in interface CellEditor
Returns:: the value currently being edited

isCellEditable

public boolean isCellEditable(EventObject event)

If the realEditor returns true to this message, prepareForEditing is messaged and true is returned.

Specified by:

isCellEditable in interface CellEditor

Parameters:

event - the event the editor should use to consider whether to begin editing or not

Returns:

true if editing can be started

See Also:

shouldSelectCell

public boolean shouldSelectCell(EventObject event)

Messages the realEditor for the return value.

Specified by:

shouldSelectCell in interface CellEditor

Parameters:

event - the event the editor should use to start editing

Returns:

true if the editor would like the editing cell to be selected; otherwise returns false

See Also:

stopCellEditing

public boolean stopCellEditing()

If the realEditor will allow editing to stop, the realEditor is removed and true is returned, otherwise false is returned.

Specified by:: stopCellEditing in interface CellEditor
Returns:: true if editing was stopped; false otherwise

cancelCellEditing

public void cancelCellEditing()

Messages cancelCellEditing to the realEditor and removes it from this instance.

Specified by:: cancelCellEditing in interface CellEditor

addCellEditorListener

public void addCellEditorListener(CellEditorListener l)

Adds the CellEditorListener.

Specified by:: addCellEditorListener in interface CellEditor
Parameters:: l - the listener to be added

removeCellEditorListener

public void removeCellEditorListener(CellEditorListener l)

Removes the previously added CellEditorListener.

Specified by:: removeCellEditorListener in interface CellEditor
Parameters:: l - the listener to be removed

getCellEditorListeners

public CellEditorListener[] getCellEditorListeners()

Returns an array of all the CellEditorListeners added to this DefaultTreeCellEditor with addCellEditorListener().

Returns:: all of the CellEditorListeners added or an empty array if no listeners have been added
Since:: 1.4

valueChanged

public void valueChanged(TreeSelectionEvent e)

Resets lastPath.

Specified by:: valueChanged in interface TreeSelectionListener
Parameters:: e - the event that characterizes the change.

actionPerformed

public void actionPerformed(ActionEvent e)

Messaged when the timer fires, this will start the editing session.

Specified by:: actionPerformed in interface ActionListener
Parameters:: e - the event to be processed

setTree

protected void setTree(JTree newTree)

Sets the tree currently editing for. This is needed to add a selection listener.

Parameters:: newTree - the new tree to be edited

shouldStartEditingTimer

protected boolean shouldStartEditingTimer(EventObject event)

Returns true if event is a MouseEvent and the click count is 1.

Parameters:: event - the event being studied
Returns:: whether event should starts the editing timer

startEditingTimer

protected void startEditingTimer()

Starts the editing timer.

canEditImmediately

protected boolean canEditImmediately(EventObject event)

Returns true if event is null, or it is a MouseEvent with a click count > 2 and inHitRegion returns true.

Parameters:: event - the event being studied
Returns:: whether editing can be started for the given event

inHitRegion

protected boolean inHitRegion(int x, int y)

Returns true if the passed in location is a valid mouse location to start editing from. This is implemented to return false if x is <= the width of the icon and icon gap displayed by the renderer. In other words this returns true if the user clicks over the text part displayed by the renderer, and false otherwise.

Parameters:: x - the x-coordinate of the point; y - the y-coordinate of the point
Returns:: true if the passed in location is a valid mouse location

determineOffset

protected void determineOffset(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row)

Determine the offset.

Parameters:: tree - a JTree object; value - a value; isSelected - selection status; expanded - expansion status; leaf - leaf status; row - current row

prepareForEditing

protected void prepareForEditing()

Invoked just before editing is to start. Will add the editingComponent to the editingContainer.

createContainer

protected Container createContainer()

Creates the container to manage placement of editingComponent.

Returns:: new Container object

createTreeCellEditor

protected TreeCellEditor createTreeCellEditor()

This is invoked if a TreeCellEditor is not supplied in the constructor. It returns a TextField editor.

Returns:: a new TextField editor

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/tree/DefaultTreeCellEditor.html