DefaultTreeCellEditor (Java Platform SE 8 )
Keywords: javax.swing.tree.DefaultTreeCellEditor class
Date: 2015-11-19

javax.swing.tree

## 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 layed 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:
    `JTree`

- - ### Nested Class Summary

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

  - ### Field Summary

    Fields
    Modifier and Type | Field and 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

    Constructors
    Constructor and 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

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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)`
    `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 inherited from class java.lang.Object

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

- - ### Field Detail

    - #### 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 Detail

    - #### 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 Detail

    - #### 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()`

    - #### getFont

          public Font getFont()

      Gets the font used for editing.
      Returns:
        the editing `Font`
      See Also:
        `setFont(java.awt.Font)`

    - #### 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:
        `CellEditor.shouldSelectCell(java.util.EventObject)`

    - #### 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:
        `CellEditor.isCellEditable(java.util.EventObject)`

    - #### 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 `CellEditorListener`s added to this DefaultTreeCellEditor with addCellEditorListener().
      Returns:
        all of the `CellEditorListener`s 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`

    - #### 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

    - #### 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

    - #### 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)

    - #### 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`.

    - #### 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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