public class JTreeTable.TreeTableCellEditor extends DefaultCellEditor
To support editing of the tree column we can not make the tree editable. The reason this doesn't work is that you can not use the same component for editing and renderering. The table may have the need to paint cells, while a cell is being edited. If the same component were used for the rendering and editing the component would be moved around, and the contents would change. When editing, this is undesirable, the contents of the text field must stay the same, including the caret blinking, and selections persisting. For this reason the editing is done via a TableCellEditor.
Another interesting thing to be aware of is how tree positions
its render and editor. The render/editor is responsible for drawing the
icon indicating the type of node (leaf, branch...). The tree is
responsible for drawing any other indicators, perhaps an additional
+/- sign, or lines connecting the various nodes. So, the renderer
is positioned based on depth. On the other hand, table always makes
its editor fill the contents of the cell. To get the allusion
that the table cell editor is part of the tree, we don't want the
table cell editor to fill the cell bounds. We want it to be placed
in the same manner as tree places it editor, and have table message
the tree to paint any decorations the tree wants. Then, we would
only have to worry about the editing part. The approach taken
here is to determine where tree would place the editor, and to override
the reshape method in the JTextField component to
nudge the textfield to the location tree would place it. Since
JTreeTable will paint the tree behind the editor everything should
just work. So, that is what we are doing here. Determining of
the icon position will only work if the TreeCellRenderer is
an instance of DefaultTreeCellRenderer. If you need custom
TreeCellRenderers, that don't descend from DefaultTreeCellRenderer,
and you want to support editing in JTreeTable, you will have
to do something similiar.
DefaultCellEditor.EditorDelegateclickCountToStart, delegate, editorComponentchangeEvent, listenerList| Constructor and Description |
|---|
TreeTableCellEditor() |
| Modifier and Type | Method and Description |
|---|---|
Component |
getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int r,
int c)
Overridden to determine an offset that tree would place the
editor at.
|
boolean |
isCellEditable(EventObject e)
This is overridden to forward the event to the tree.
|
cancelCellEditing, getCellEditorValue, getClickCountToStart, getComponent, getTreeCellEditorComponent, setClickCountToStart, shouldSelectCell, stopCellEditingaddCellEditorListener, fireEditingCanceled, fireEditingStopped, getCellEditorListeners, removeCellEditorListenerclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitaddCellEditorListener, removeCellEditorListenerpublic Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int r, int c)
getRowBounds JTree method, and additionally
from the icon DefaultTreeCellRenderer will use.
The offset is then set on the TreeTableTextField component created in the constructor, and returned.
getTableCellEditorComponent in interface TableCellEditorgetTableCellEditorComponent in class DefaultCellEditorpublic boolean isCellEditable(EventObject e)
isCellEditable in interface CellEditorisCellEditable in class DefaultCellEditorCopyright © 2023. All rights reserved.