Re: [platform-swt-dev] Problem with Table

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

This bug should already be fixed.  Please
try it in the latest SWT from HEAD.

Neric <neric@xxxxxxxxxxxx>
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx

08/04/2006 12:05 PM

Please respond to
"Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>

To	platform-swt-dev@xxxxxxxxxxx
cc
Subject	[platform-swt-dev] Problem with Table

Hello everybody,

I discovered the Snippet 213, and it resolve my problem : I can layout
the lines of my table what I want!! But, there is a problem when I try
to remove a line, except the last : a nullPointerException exception occured
:(

Here the modified snippet which cause the exception : 

/*******************************************************************************
 * 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;

/* 
 * example snippet: Multiple lines per TableItem
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.2
 */

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;

public class Snippet231 {
    
public static void main(String [] args) {
    Display display = new Display();
    Shell shell = new Shell (display);
    shell.setText("Multiple lines in a TableItem");
    shell.setLayout (new FillLayout());
    final Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION);
    table.setHeaderVisible(true);
    table.setLinesVisible(true);
    int columnCount = 4;
    for (int i=0; i<columnCount; i++) {
        TableColumn column = new TableColumn(table,
SWT.NONE);
        column.setText("Column " + i);  
 
    }
    int itemCount = 8;
    for(int i = 0; i < itemCount; i++) {
        TableItem item = new TableItem(table, SWT.NONE);
        item.setText(new String[] {"item "+i+"
a", "item "+i+" b", "item "+i+"
c", "item "+i+" d"});
    }    
    /*
     * 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:
{
                    TableItem
item = (TableItem)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:
{
                    TableItem
item = (TableItem)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(TableItem item, int column)
{
            String text = item.getText(column);
            if (column != 0) {
                int index = table.indexOf(item);
                if ((index+column)
% 3 == 1){
                    text
+="\nnew line";
                }
                if ((index+column)
% 3 == 2) {
                    text
+="\nnew line\nnew line";
                }
            }
            return text;
        }
    };
    table.addListener(SWT.MeasureItem, paintListener);
    table.addListener(SWT.PaintItem, paintListener);
    table.addListener(SWT.EraseItem, paintListener);
    
    //My modifications
    table.addKeyListener(new KeyAdapter(){
        public void keyPressed(KeyEvent event) {
            if(event.keyCode == SWT.DEL)
                table.remove(table.getSelectionIndices());
        }            
    });
    // End of my modifications
    
    for (int i = 0; i < columnCount; i++) {
        table.getColumn(i).pack();
    }
    shell.pack();
    shell.open();
    while(!shell.isDisposed()) {
        if(!display.readAndDispatch()) display.sleep();
    }
    display.dispose();
}
}


Is it a bug? 
Is there an error in my code?


Thanks for your help,
Christopher_______________________________________________
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