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/*******************************************************************************
* Copyright (c) 2000, 2006 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;
/*
* Tree example snippet: draw multiple lines in a tree item
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet227 {
public static void main(String [] args) {
Display display = new Display();
Shell shell = new Shell (display);
shell.setText("Multiple lines in a TreeItem");
shell.setLayout (new FillLayout());
final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION);
tree.setHeaderVisible(true);
tree.setLinesVisible(true);
int columnCount = 4;
for (int i=0; i<columnCount; i++) {
TreeColumn column = new TreeColumn(tree, SWT.NONE);
column.setText("Column " + i);
column.setWidth(100);
}
int itemCount = 3;
for (int i=0; i<itemCount; i++) {
TreeItem item1 = new TreeItem(tree, SWT.NONE);
item1.setText("item "+i);
for (int c=1; c < columnCount; c++) {
item1.setText(c, "item ["+i+"-"+c+"]");
}
for (int j=0; j<itemCount; j++) {
TreeItem item2 = new TreeItem(item1, SWT.NONE);
item2.setText("item ["+i+" "+j+"]");
for (int c=1; c<columnCount; c++) {
item2.setText(c, "item ["+i+" "+j+"-"+c+"]");
}
for (int k=0; k<itemCount; k++) {
TreeItem item3 = new TreeItem(item2, SWT.NONE);
item3.setText("item ["+i+" "+j+" "+k+"]");
for (int c=1; c<columnCount; c++) {
item3.setText(c, "item ["+i+" "+j+" "+k+"-"+c+"]");
}
}
}
}
/*
* NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
* Therefore, it is critical for performance that these methods be
* as efficient as possible.
*/
Listener paintListener = new Listener() {
public void handleEvent(Event event) {
switch(event.type) {
case SWT.MeasureItem: {
TreeItem item = (TreeItem)event.item;
String text = getText(item, event.index);
Point size = event.gc.textExtent(text);
event.width = size.x;
event.height = Math.max(event.height, size.y);
break;
}
case SWT.PaintItem: {
TreeItem item = (TreeItem)event.item;
String text = getText(item, event.index);
Point size = event.gc.textExtent(text);
int offset2 = event.index == 0 ? Math.max(0, (event.height - size.y) / 2) : 0;
event.gc.drawText(text, event.x, event.y + offset2, true);
break;
}
case SWT.EraseItem: {
event.detail &= ~SWT.FOREGROUND;
break;
}
}
}
String getText(TreeItem item, int column) {
String text = item.getText(column);
if (column != 0) {
TreeItem parent = item.getParentItem();
int index = parent == null ? tree.indexOf(item) : parent.indexOf(item);
if ((index+column) % 3 == 1){
text +="\nnew line";
}
if ((index+column) % 3 == 2) {
text +="\nnew line\nnew line";
}
}
return text;
}
};
tree.addListener(SWT.MeasureItem, paintListener);
tree.addListener(SWT.PaintItem, paintListener);
tree.addListener(SWT.EraseItem, paintListener);
shell.setSize(600, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
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