試圖創建基本的JFace應用程序，不知道什麼問題

Question

我試圖在shell元素下添加一個複合元素，現在沒有顯示按鈕小部件。我錯過了什麼嗎？

import org.eclipse.swt.SWT; 
import org.eclipse.swt.graphics.Point; 
import org.eclipse.swt.layout.FillLayout; 
import org.eclipse.swt.widgets.Button; 
import org.eclipse.swt.widgets.Composite; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 

public class RadioButtonDemo { 

    /** 
    * Create radio buttons 
    * 
    * @param parent 
    *   Parent widget 
    * @param labels 
    *   Array of labels for the radio buttons 
    * @param defaultSelection 
    *   The default button to select 
    * @return The newly created buttons complete with labels 
    */ 
    public final Button[] getRadioButtons(final Composite parent, 
      final String[] labels, int defaultSelection) { 
     // some sanity stuff 
     assert (defaultSelection < labels.length); 
     assert (!parent.equals(null)); 

     final Button[] buttons = new Button[labels.length]; 
     for (int i = 0; i < buttons.length; i++) { 
      buttons[i] = new Button(parent, SWT.RADIO); 
      buttons[i].setText(labels[i]); 
      buttons[i].setSelection(defaultSelection == i); 
     } 

     return buttons; 
    } 

    public void showDemo() { 
     // some setup 
     final Display display = new Display(); 

     Shell shell = new Shell(display, SWT.DIALOG_TRIM); 
     // shell.setLayout(new RowLayout()); 
     shell.setSize(new Point(200, 200)); // make it small for the demo 
     shell.setText("Radio button demo"); 
     shell.setLayout(new FillLayout()); 

     Composite c = new Composite(shell, SWT.NONE); 

     final String[] labels = new String[] { 
       "Never delete code coverage launches from history", 
       "Delete oldest code coverage launches from history" }; 
     final Button[] radioButtons = this.getRadioButtons(c, labels, 0); 

     shell.pack(); // min-size... 
     shell.open(); // open shell 

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

     display.dispose(); // cleanup 
    } 

    public static void main(String[] args) { 
     // new instance 
     RadioButtonDemo instance = new RadioButtonDemo(); 
     instance.showDemo(); 

    } 
} 

Answer 1

您需要在c上設置layout，例如，

Composite c = new Composite(shell, SWT.NONE); 
c.setLayout(new FillLayout());