Package org.eclipse.swt.custom
Class TreeEditor
java.lang.Object
org.eclipse.swt.custom.ControlEditor
org.eclipse.swt.custom.TreeEditor
A TreeEditor is a manager for a Control that appears above a cell in a Tree and tracks with the
moving and resizing of that cell. It can be used to display a text widget above a cell
in a Tree so that the user can edit the contents of that cell. It can also be used to display
a button that can launch a dialog for modifying the contents of the associated cell.
Here is an example of using a TreeEditor:
final Tree tree = new Tree(shell, SWT.BORDER);
for (int i = 0; i < 3; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("item " + i);
for (int j = 0; j < 3; j++) {
TreeItem subItem = new TreeItem(item, SWT.NONE);
subItem.setText("item " + i + " " + j);
}
}
final TreeEditor editor = new TreeEditor(tree);
//The editor must have the same size as the cell and must
//not be any smaller than 50 pixels.
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
editor.minimumWidth = 50;
tree.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
// Clean up any previous editor control
Control oldEditor = editor.getEditor();
if (oldEditor != null) oldEditor.dispose();
// Identify the selected row
TreeItem item = (TreeItem)e.item;
if (item == null) return;
// The control that will be the editor must be a child of the Tree
Text newEditor = new Text(tree, SWT.NONE);
newEditor.setText(item.getText());
newEditor.addModifyListener(new ModifyListener() {
public void modifyText(ModifyEvent e) {
Text text = (Text)editor.getEditor();
editor.getItem().setText(text.getText());
}
});
newEditor.selectAll();
newEditor.setFocus();
editor.setEditor(newEditor, item);
}
});
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Field Summary
Fields inherited from class org.eclipse.swt.custom.ControlEditor
grabHorizontal, grabVertical, horizontalAlignment, minimumHeight, minimumWidth, verticalAlignment
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
dispose()
Removes all associations between the TreeEditor and the row in the tree.int
Returns the zero based index of the column of the cell being tracked by this editor.getItem()
Returns the TreeItem for the row of the cell being tracked by this editor.void
layout()
Lays out the control within the underlying composite.void
setColumn
(int column) Sets the zero based index of the column of the cell being tracked by this editor.void
Specify the Control that is to be displayed.void
Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.void
Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.void
Specifies theTreeItem
that is to be edited.Methods inherited from class org.eclipse.swt.custom.ControlEditor
getEditor
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Constructor Details
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TreeEditor
Creates a TreeEditor for the specified Tree.- Parameters:
tree
- the Tree Control above which this editor will be displayed
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Method Details
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dispose
public void dispose()Removes all associations between the TreeEditor and the row in the tree. The tree and the editor Control are not disposed.- Overrides:
dispose
in classControlEditor
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getColumn
public int getColumn()Returns the zero based index of the column of the cell being tracked by this editor.- Returns:
- the zero based index of the column of the cell being tracked by this editor
- Since:
- 3.1
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getItem
Returns the TreeItem for the row of the cell being tracked by this editor.- Returns:
- the TreeItem for the row of the cell being tracked by this editor
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setColumn
public void setColumn(int column) Sets the zero based index of the column of the cell being tracked by this editor.- Parameters:
column
- the zero based index of the column of the cell being tracked by this editor- Since:
- 3.1
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setItem
Specifies theTreeItem
that is to be edited.- Parameters:
item
- the item to be edited
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setEditor
Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.Note: The Control provided as the editor must be created with its parent being the Tree control specified in the TreeEditor constructor.
- Parameters:
editor
- the Control that is displayed above the cell being editeditem
- the TreeItem for the row of the cell being tracked by this editorcolumn
- the zero based index of the column of the cell being tracked by this editor- Since:
- 3.1
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setEditor
Description copied from class:ControlEditor
Specify the Control that is to be displayed.Note: The Control provided as the editor must be created with its parent being the Composite specified in the ControlEditor constructor.
- Overrides:
setEditor
in classControlEditor
- Parameters:
editor
- the Control that is displayed above the composite being edited
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setEditor
Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.Note: The Control provided as the editor must be created with its parent being the Tree control specified in the TreeEditor constructor.
- Parameters:
editor
- the Control that is displayed above the cell being editeditem
- the TreeItem for the row of the cell being tracked by this editor
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layout
public void layout()Description copied from class:ControlEditor
Lays out the control within the underlying composite. This method should be called after changing one or more fields to force the Editor to resize.- Overrides:
layout
in classControlEditor
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