在ECLIPSE中開(kāi)發(fā)JAVA程序,當(dāng)我們打開(kāi)一個(gè)JAVA類時(shí),ECLIPSE會(huì)打開(kāi)一個(gè)JDT的JAVA EDITOR來(lái)顯示這個(gè)類.當(dāng)把鼠標(biāo)移到某一個(gè)JAVA類型時(shí),會(huì)出現(xiàn)一個(gè)tooltip的提示信息.這時(shí)我們可以按F2來(lái)把焦點(diǎn)設(shè)定在這個(gè)提示信息窗口上,這樣就不會(huì)因?yàn)橐灰苿?dòng)鼠標(biāo)這個(gè)提示窗口就消失了.        
         tooltip大家都會(huì)加,但怎么把F2這個(gè)功能也加上去呢?
         其實(shí)很容易,下面我用簡(jiǎn)單的代碼介紹一下:
         比如說(shuō)我們要在Table上加上tooltip,當(dāng)鼠標(biāo)移到某一行時(shí),顯示該行的提示信息.
         我們可以這么做:
         TableViewer viewer
         Table table = viewer.getTable();
         TooltipListener tooltipListener = new TooltipListener(viewer);
         table.addListener(SWT.KeyDown,tooltipListener);
         table.addListener(SWT.MouseHover,tooltipListener);
         這里的TooltipListener類就是一個(gè)監(jiān)聽(tīng)器,來(lái)監(jiān)聽(tīng)系統(tǒng)的兩個(gè)事件:一個(gè)是鍵盤(pán)敲下,一個(gè)是鼠標(biāo)停留.
            private class TooltipListener implements Listener {
                   private Shell tipshell;
                   private Text msg;
                   private TableViewer viewer;
                   private Shell shell;
                   private Display display;

                   public TooltipListener(TableViewer viewer) {
                         this.viewer = viewer;
                         shell = this.viewer .getControl().getShell();
                         display = shell.getDisplay();
                    }

                    public void handleEvent(Event event) {
                          if(event.type == SWT.KeyDown){
                               if(event.keyCode == SWT.F2){
                                    tipshell.forceFocus();
                                    tooltiptext.setFacus();
                               }
                          }else if(event.type == SWT.MouseHover){
                               TableItem item = viewer.getTable().getItem(new Point(event.x, event.y));
                               tipShell = new Shell(shell, SWT.ON_TOP | SWT.TOOL);
                               tipShell.setLayout(new FillLayout());
                               msg = new Text(tipShell, SWT.WRAP);
                               msg.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
                               msg.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
                               msg.setText("hello!nihao");
                               tipShell.setVisible(true);
                          }
                }
                break;
            }
       }
       當(dāng)鼠標(biāo)停留,這個(gè)監(jiān)聽(tīng)器監(jiān)聽(tīng)到了停留事件就打開(kāi)一個(gè)tooltip:hello!nihao 這時(shí)如果按下F2,這個(gè)監(jiān)聽(tīng)器就監(jiān)聽(tīng)到,馬上把鼠標(biāo)焦點(diǎn)定位到tooltip上.
       ^_^,就這么簡(jiǎn)單!其實(shí)就是兩個(gè)語(yǔ)句:tipshell.forceFocus();tooltiptext.setFacus();
       希望對(duì)大家有幫助.
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