public class TreeTableCellEditor extends JXTable.GenericEditor
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 rendering. 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
reshape method in the JTextField component to
nudge the textfield to the location tree would place it. Since
JXTreeTable 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 JXTreeTable, you will have
to do something similar.
|Modifier and Type||Class and Description|
Component used by TreeTableCellEditor.
|Modifier and Type||Field and Description|
clickCountToStart, delegate, editorComponent
|Modifier and Type||Method and Description|
Overriden to determine an offset that tree would place the editor at.
This is overriden to forward the event to the tree.
cancelCellEditing, getClickCountToStart, getComponent, getTreeCellEditorComponent, setClickCountToStart, shouldSelectCell
addCellEditorListener, fireEditingCanceled, fireEditingStopped, getCellEditorListeners, removeCellEditorListener
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
getRowBoundsJTree method, and additionaly from the icon DefaultTreeCellRenderer will use.
The offset is then set on the TreeTableTextField component created in the constructor, and returned.
protected void initEditorOffset(JTable table, int row, int column, boolean isSelected)
public boolean isCellEditable(EventObject e)
WebARTS Library Licensed Under the GNU - General Public License. Other Libraries licensed under their respective Open Source Licenses