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  public class ColorList extends Canvas {
  Vector colors = new Vector();  // 用于保存我們顏色控件中的顏色值
  Vector colorNames = new Vector(); // 用于保存顏色控件中的顏色名字
 
  int rowSel = -1; // 用于保存當(dāng)前選中的行號(hào)
  int oldRowSel = -1; // 用于保存上一次選中的行號(hào)
 
  int maxX, maxY;  // 用于保存列表的寬度和高度
  int lineHeight; // 用于設(shè)置行高
 
  int cx = 0;  // 滾動(dòng)條滾動(dòng)后，控件的圖形相對(duì)于控件可見區(qū)域左上角的x坐標(biāo)
  int cy = 0;  // 滾動(dòng)條滾動(dòng)后，控件的圖形相對(duì)于控件可見區(qū)域左上角的y坐標(biāo)
 }

  addPaintListener(new PaintListener() {
   public void paintControl(PaintEvent e) {
    GC gc = e.gc;
    Point size = getSize();
    int beginx = e.x;
    int beginy = (e.y / lineHeight) * lineHeight;
    int beginLine = (e.y - cy) / lineHeight;
    int endLine = beginLine + e.height / lineHeight + 1;
    if (endLine > getItemCount())
     endLine = getItemCount();
    for (int i = beginLine; i < endLine; i++) {
     boolean selected = false;
     if (i == rowSel)
      selected = true;
     onPaint(gc, i, cx, beginy + (i - beginLine) * lineHeight,
       selected);
    }
   }
  }); 

  addListener(SWT.KeyDown, new Listener() {
   public void handleEvent(Event event) {
    switch (event.keyCode) {
    case SWT.ARROW_UP: // 處理向上鍵
     if (rowSel != 0) {
      oldRowSel = rowSel;
      rowSel--;
      if (oldRowSel != rowSel) { //發(fā)送消息讓控件重繪
       ((Canvas) event.widget).redraw(cx, (rowSel + cy
         / lineHeight)
         * lineHeight, maxX, lineHeight*2, false);
      }
      if (rowSel < -cy / lineHeight) { //如果需要，滾動(dòng)滾動(dòng)條
       ScrollBar bar = ((Canvas) event.widget)
         .getVerticalBar();
       bar.setSelection(bar.getSelection() - lineHeight);
       scrollVertical(bar);
      }
      selectionChanged(); // 發(fā)送selectionChanged事件
     }
     break;
    case SWT.ARROW_DOWN: // down arror key
     …
     break;
    }
   }
  });

 addMouseListener(new MouseListener() {
   public void mouseDoubleClick(MouseEvent e) {
   }
   public void mouseDown(MouseEvent e) {
    int row = (e.y - cy) / lineHeight; //計(jì)算選中的行
    if (row >= 0) {
     oldRowSel = rowSel;
     rowSel = row;
    }
    if (oldRowSel != rowSel) { // 重畫舊的和新的選擇項(xiàng)
     ((Canvas) e.getSource()).redraw(cx, (e.y / lineHeight)
       * lineHeight, maxX, lineHeight, false);
     ((Canvas) e.getSource()).redraw(cx, (oldRowSel + cy
       / lineHeight)
       * lineHeight, maxX, lineHeight, false);
    }
    selectionChanged();
   }
   public void mouseUp(MouseEvent e) {
   }
  });

addFocusListener(new FocusListener() {
   public void focusGained(FocusEvent e) {
    ((Canvas) e.getSource()).redraw(cx, rowSel * lineHeight, maxX,
      lineHeight, true);
   }
   public void focusLost(FocusEvent e) {
    ((Canvas) e.getSource()).redraw(cx, rowSel * lineHeight, maxX,
      lineHeight, true);
   }
  });

 void onPaint(GC gc, int row, int beginx, int beginy, boolean isSelected) {
  Color initColor = gc.getBackground();
  Color initForeColor = gc.getForeground();
  if (isSelected) {
   gc.setBackground(Display.getCurrent().getSystemColor(
     SWT.COLOR_LIST_SELECTION));
   gc.fillRectangle(beginx, beginy, maxX, lineHeight);
   gc.setForeground(Display.getCurrent().getSystemColor(
     SWT.COLOR_LIST_SELECTION_TEXT));
  } else {
   gc.setBackground(initColor);
  }
  gc.drawString((String) colorNames.get(row), beginx + 24, beginy);
  Color color = Display.getCurrent().getSystemColor(
    ((Integer) colors.get(row)).intValue());
  gc.setBackground(color);
  gc.fillRectangle(beginx + 2, beginy + 2, 20, lineHeight - 4);
  gc.setBackground(initColor);
  gc.setForeground(initForeColor);
  if (isFocusControl() && isSelected)
   gc.drawFocus(cx, beginy, maxX, lineHeight);
 }
 

addTraverseListener(new TraverseListener() {
   public void keyTraversed(TraverseEvent e) {
    if (e.detail == SWT.TRAVERSE_TAB_NEXT
      || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) {
     e.doit = true;
    }
   };
  });

bar = getVerticalBar();
  if (bar != null) {
   bar.addSelectionListener(new SelectionAdapter() {
    public void widgetSelected(SelectionEvent event) {
     scrollVertical((ScrollBar) event.widget);
    }
   });
  }

Vector selectionListeners = new Vector();

Accessible accessible = getAccessible();
     accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
         public void getRole(AccessibleControlEvent e) {
          int role = 0;
             int childID = e.childID;
             if (childID == ACC.CHILDID_SELF) {
                 role = ACC.ROLE_LIST;
             } else if (childID >= 0 && childID < colors.size()) {
                 role = ACC.ROLE_LISTITEM;
             }
             e.detail = role;
         }
         
         public void getValue(AccessibleControlEvent e){
          int childID = e.childID;
             if (childID == ACC.CHILDID_SELF) {
                 e.result = getText();
             } else if (childID >= 0 && childID < colors.size()) {
                 e.result = (String)colorNames.get(childID);
             }
         }
         
         public void getChildAtPoint(AccessibleControlEvent e) {
          Point testPoint = toControl(new Point(e.x, e.y));
             int childID = ACC.CHILDID_NONE;
             childID = (testPoint.y - cy)/lineHeight; 
             if (childID == ACC.CHILDID_NONE) {
                 Rectangle location = getBounds();
                 location.height = location.height - getClientArea().height;
                 if (location.contains(testPoint)) {
                     childID = ACC.CHILDID_SELF;
                 }
             }
             e.childID = childID;
         }
         
         public void getLocation(AccessibleControlEvent e) {
          Rectangle location = null;
             int childID = e.childID;
             if (childID == ACC.CHILDID_SELF) {
                 location = getBounds();
             }
             if (childID >= 0 && childID < colors.size()) {
                 location = new Rectangle(cx,childID*lineHeight+cy,maxX,lineHeight);
             }
             if (location != null) {
                 Point pt = toDisplay(new Point(location.x, location.y));
                 e.x = pt.x;
                 e.y = pt.y;
                 e.width = location.width;
                 e.height = location.height;
             }
         }
         
         public void getChildCount(AccessibleControlEvent e) {
             e.detail = colors.size();
         }
         
         public void getState(AccessibleControlEvent e) {
          int state = 0;
             int childID = e.childID;
             if (childID == ACC.CHILDID_SELF) {
                 state = ACC.STATE_NORMAL;
             } else if (childID >= 0 && childID < colors.size()) {
                 state = ACC.STATE_SELECTABLE;
                 if (isFocusControl()) {
                     state |= ACC.STATE_FOCUSABLE;
                 }
                 if (rowSel == childID) {
                     state |= ACC.STATE_SELECTED;
                     if (isFocusControl()) {
                         state |= ACC.STATE_FOCUSED;
                     }
                 }
             }
             e.detail = state;
         }
     });