swt table对单元格中的文本长度有限制吗？

Question

我使用JFace TableViewer和数据绑定来显示数据库表的数据，有些列有很长的文本，我发现文本被删除。如果我激活与该单元格关联的文本编辑器，则可以看到全文。

swt表对单元格中的文本长度有限制吗？或操作系统有这样的限制？（我使用的Eclipse 3.6和Windows 7 32位）

/******************************************************************************* 
* Copyright (c) 2006 Tom Schindl 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: 
*  Tom Schindl - initial API and implementation 
*******************************************************************************/ 

package org.eclipse.jface.snippets.viewers; 

import org.eclipse.jface.viewers.IStructuredContentProvider; 
import org.eclipse.jface.viewers.LabelProvider; 
import org.eclipse.jface.viewers.TableViewer; 
import org.eclipse.jface.viewers.Viewer; 
import org.eclipse.swt.layout.FillLayout; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 

/** 
* A simple TableViewer to demonstrate usage 
* 
* @author Tom Schindl <tom.schindl@bestsolution.at> 
* 
*/ 
public class Snippet001TableViewer { 
    private class MyContentProvider implements IStructuredContentProvider { 

     /* (non-Javadoc) 
     * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) 
     */ 
     public Object[] getElements(Object inputElement) { 
      return (MyModel[])inputElement; 
     } 

     /* (non-Javadoc) 
     * @see org.eclipse.jface.viewers.IContentProvider#dispose() 
     */ 
     public void dispose() { 

     } 

     /* (non-Javadoc) 
     * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object) 
     */ 
     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { 

     } 

    } 

    public class MyModel { 
     public int counter; 

     public MyModel(int counter) { 
      this.counter = counter; 
     } 

     public String toString() { 
      **return "very loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooog text" + this.counter;** 
     } 
    } 

    public Snippet001TableViewer(Shell shell) { 
     final TableViewer v = new TableViewer(shell); 
     v.setLabelProvider(new LabelProvider()); 
     v.setContentProvider(new MyContentProvider()); 
     MyModel[] model = createModel(); 
     v.setInput(model); 
     v.getTable().setLinesVisible(true); 
    } 

    private MyModel[] createModel() { 
     MyModel[] elements = new MyModel[10]; 

     for(int i = 0; i < 10; i++) { 
      elements[i] = new MyModel(i); 
     } 

     return elements; 
    } 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     Display display = new Display(); 
     Shell shell = new Shell(display); 
     shell.setLayout(new FillLayout()); 
     new Snippet001TableViewer(shell); 
     shell.open(); 

     while (!shell.isDisposed()) { 
      if (!display.readAndDispatch()) display.sleep(); 
     } 

     display.dispose(); 

    } 

} 

Answer 1

它的Windows的bug /功能（see bugzilla for details），这里是你的代码的证明（Linux的屏幕截图）

我可能要解决通过自我细胞呈现这个bug /功能（见Custom Drawing Table and Tree Items教程）。

Answer 2

我找到了一个简单的方法来显示整个文本。 您必须使用StyledCellLabelProvider并覆盖update-method。

这是一个小例子，它显示了StyledCellLabelProvider和ColumnLabelProvider之间的区别。重写ColumnLabelProvider的更新方法是不必要的。我做到了这一点，以表明它取决于班级。

package tabletest; 

import org.eclipse.jface.layout.GridDataFactory; 
import org.eclipse.jface.viewers.ArrayContentProvider; 
import org.eclipse.jface.viewers.ColumnLabelProvider; 
import org.eclipse.jface.viewers.LabelProvider; 
import org.eclipse.jface.viewers.StyledCellLabelProvider; 
import org.eclipse.jface.viewers.TableViewer; 
import org.eclipse.jface.viewers.TableViewerColumn; 
import org.eclipse.jface.viewers.ViewerCell; 
import org.eclipse.swt.SWT; 
import org.eclipse.swt.layout.GridLayout; 
import org.eclipse.swt.widgets.Composite; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 
import org.eclipse.swt.widgets.TableColumn; 

public class MyClass { 

    private static final String LINE = "123456789A123456789B123456789C123456789D123456789E123456789F123456789G123456789H123456789I123456789J"// 100 
      + "123456789K123456789L123456789M123456789N123456789O123456789P123456789Q123456789R123456789S123456789T" // 200 
      + "123456789U123456789V123456789W123456789X123456789Y123456789Z" // 260 
      + " a lot mor text"; 

    public MyClass(Shell shell){ 
     createControl(shell); 
    } 

    private void createControl(Composite parent){ 
     parent.setLayout(new GridLayout(1, true)); 

     TableViewer viewer = new TableViewer(parent, SWT.FULL_SELECTION | SWT.BORDER | SWT.V_SCROLL |SWT.H_SCROLL); 
     viewer.getTable().setHeaderVisible(true); 
     viewer.getTable().setLinesVisible(true); 
     viewer.setContentProvider(ArrayContentProvider.getInstance()); 
     viewer.setLabelProvider(new LabelProvider()); 

     createColumn(viewer); 

     viewer.setInput(new String[] { LINE }); 
     for(TableColumn col : viewer.getTable().getColumns()){ 
      col.pack(); 
     } 

     GridDataFactory.fillDefaults().grab(true, true).applyTo(viewer.getControl()); 
    } 

    private void createColumn(TableViewer viewer) { 
     TableViewerColumn column1 = new TableViewerColumn(viewer, SWT.NONE); 
     column1.getColumn().setText("ColumnLabelProvider"); 
     column1.setLabelProvider(new ColumnLabelProvider(){ 
      @Override 
      public void update(ViewerCell cell) { 
       cell.setText(cell.getElement().toString()); 
       super.update(cell); 
      } 
     }); 
     TableViewerColumn column2 = new TableViewerColumn(viewer, SWT.NONE); 
     column2.getColumn().setText("StyledCellLabelProvider"); 
     column2.setLabelProvider(new StyledCellLabelProvider() { 
      @Override 
      public void update(ViewerCell cell) { 
       cell.setText(cell.getElement().toString()); 
       super.update(cell); 
      } 
     }); 
    } 

    public static void main(String[] args) { 
     Display display = new Display(); 
     Shell shell = new Shell(display); 
     new MyClass(shell); 
     shell.open(); 
     while(!shell.isDisposed()){ 
      if(!display.readAndDispatch()){ 
       display.sleep(); 
      } 
     } 
    } 
} 

当您更改LabelProvider到StyledCellLabelProvider并覆盖更新方法类似于我的例子也工作在Snippet001TableViewer。