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.EditorDelegate
clickCountToStart, delegate, editorComponent
changeEvent, listenerList
Constructor and Description |
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JTreeTable.TreeTableCellEditor() |
Modifier and Type | Method and Description |
---|---|
Component |
getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column)
Overridden to determine an offset where the tree would place the
editor.
|
boolean |
isCellEditable(EventObject event)
Overridden to forward the event to the tree.
|
cancelCellEditing, getCellEditorValue, getClickCountToStart, getComponent, getTreeCellEditorComponent, setClickCountToStart, shouldSelectCell, stopCellEditing
addCellEditorListener, fireEditingCanceled, fireEditingStopped, getCellEditorListeners, removeCellEditorListener
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
addCellEditorListener, removeCellEditorListener
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
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 TableCellEditor
getTableCellEditorComponent
in class DefaultCellEditor
public boolean isCellEditable(EventObject event)
isCellEditable
in interface CellEditor
isCellEditable
in class DefaultCellEditor