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/*******************************************************************************
* Copyright (c) 2011, 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* TreeCursor example snippet: navigate a Tree's cells with the arrow keys.
* Edit when user hits Return key. Exit edit mode by hitting Escape (cancels edit)
* or Return (applies edit to tree). Expand/Collapse with MOD1+Arrow keys.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.8
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet360 {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
// create a a tree with 3 columns and fill with data
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION);
tree.setLayoutData(new GridData(GridData.FILL_BOTH));
tree.setHeaderVisible(true);
TreeColumn column1 = new TreeColumn(tree, SWT.NONE);
TreeColumn column2 = new TreeColumn(tree, SWT.NONE);
TreeColumn column3 = new TreeColumn(tree, SWT.NONE);
for (int i = 0; i < 9; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText(new String[] { "root " + i + " 0", "root " + i + " 1", "root " + i + " 2" });
for (int j = 0; j < 9; j++) {
TreeItem item2 = new TreeItem(item, SWT.NONE);
item2.setText(new String[] { "child " + j + " 0", "child " + j + " 1", "child " + j + " 2" });
TreeItem current = item2;
for (int k = 0; k < 5; k++) {
TreeItem item3 = new TreeItem(current, SWT.NONE);
item3.setText(new String[] { "descendent " + k + " 0", "descendent " + k + " 1", "descendent " + k + " 2" });
current = item3;
}
}
}
column1.setWidth(200);
column2.setWidth(100);
column3.setWidth(100);
// create a TreeCursor to navigate around the tree
final TreeCursor cursor = new TreeCursor(tree, SWT.NONE);
// create an editor to edit the cell when the user hits "ENTER"
// while over a cell in the tree
final ControlEditor editor = new ControlEditor(cursor);
editor.grabHorizontal = true;
editor.grabVertical = true;
cursor.addSelectionListener(new SelectionAdapter() {
// when the TreeEditor is over a cell, select the corresponding row
// in the tree
@Override
public void widgetSelected(SelectionEvent e) {
tree.setSelection(new TreeItem[] { cursor.getRow() });
}
// when the user hits "ENTER" in the TreeCursor, pop up a text
// editor so that they can change the text of the cell
@Override
public void widgetDefaultSelected(SelectionEvent e) {
final Text text = new Text(cursor, SWT.NONE);
TreeItem row = cursor.getRow();
int column = cursor.getColumn();
text.setText(row.getText(column));
text.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
// close the text editor and copy the data over
// when the user hits "ENTER"
if (e.character == SWT.CR) {
TreeItem row = cursor.getRow();
int column = cursor.getColumn();
row.setText(column, text.getText());
text.dispose();
}
// close the text editor when the user hits "ESC"
if (e.character == SWT.ESC) {
text.dispose();
}
}
});
editor.setEditor(text);
text.setFocus();
}
});
// Hide the TreeCursor when the user hits the "MOD1" or "MOD2" key.
// This allows the user to select multiple items in the tree.
cursor.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.keyCode == SWT.MOD1 || e.keyCode == SWT.MOD2
|| (e.stateMask & SWT.MOD1) != 0
|| (e.stateMask & SWT.MOD2) != 0) {
cursor.setVisible(false);
}
}
});
// Show the TreeCursor when the user releases the "MOD2" or "MOD1" key.
// This signals the end of the multiple selection task.
tree.addKeyListener(new KeyListener() {
@Override
public void keyReleased(KeyEvent e) {
if (e.keyCode == SWT.MOD1 && (e.stateMask & SWT.MOD2) != 0) return;
if (e.keyCode == SWT.MOD2 && (e.stateMask & SWT.MOD1) != 0) return;
if (e.keyCode != SWT.MOD1 && (e.stateMask & SWT.MOD1) != 0) return;
if (e.keyCode != SWT.MOD2 && (e.stateMask & SWT.MOD2) != 0) return;
TreeItem[] selection = tree.getSelection();
TreeItem row = (selection.length == 0) ? tree.getItem(tree.indexOf(tree.getTopItem())) : selection[0];
tree.showItem(row);
cursor.setSelection(row, cursor.getColumn());
cursor.setVisible(true);
cursor.setFocus();
}
@Override
public void keyPressed(KeyEvent e) {
switch (e.keyCode) {
case SWT.ARROW_LEFT:
case SWT.ARROW_RIGHT: {
if ((e.stateMask & SWT.MOD1) != 0) {
TreeItem[] selection = tree.getSelection();
if (selection.length > 0) {
selection[0].setExpanded(e.keyCode == SWT.ARROW_RIGHT);
}
break;
}
}
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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