SmartGwt中ListGrid的扩展

SmartGwt中ListGrid可以通过扩展各种方法来扩展ListGrid表格的特性，通过扩展creatRecordComponents()方法可以在某个单元格上扩展为ImgButton或者Img等，通过扩展为Label可以实现SmartGwt中的提示Hint的效果（SmartGwt默认单元格上是无法使用hint信息的，虽然有setPromt("")方法，但是不起作用。）如下代码所示，就是在单元格上放了ImgButton

 

  public void onModuleLoad() {

        final ListGrid countryGrid = new ListGrid() {
            @Override
            protected Canvas createRecordComponent(final ListGridRecord record, Integer colNum) {

                String fieldName = this.getFieldName(colNum);

                if (fieldName.equals("iconField")) {
                    HLayout recordCanvas = new HLayout(3);
                    recordCanvas.setHeight(22);
                    recordCanvas.setAlign(Alignment.CENTER);
                    ImgButton editImg = new ImgButton();
                    editImg.setShowDown(false);
                    editImg.setShowRollOver(false);
                    editImg.setLayoutAlign(Alignment.CENTER);
                    editImg.setSrc("silk/comment_edit.png");
                    editImg.setPrompt("Edit Comments");
                    editImg.setHeight(16);
                    editImg.setWidth(16);
                    editImg.addClickHandler(new ClickHandler() {
                        public void onClick(ClickEvent event) {
                            SC.say("Edit Comment Icon Clicked for country : " + record.getAttribute("countryName"));
                        }
                    });

                    ImgButton chartImg = new ImgButton();
                    chartImg.setShowDown(false);
                    chartImg.setShowRollOver(false);
                    chartImg.setAlign(Alignment.CENTER);
                    chartImg.setSrc("silk/chart_bar.png");
                    chartImg.setPrompt("View Chart");
                    chartImg.setHeight(16);
                    chartImg.setWidth(16);
                    chartImg.addClickHandler(new ClickHandler() {
                        public void onClick(ClickEvent event) {
                            SC.say("Chart Icon Clicked for country : " + record.getAttribute("countryName"));
                        }
                    });

                    recordCanvas.addMember(editImg);
                    recordCanvas.addMember(chartImg);
                    return recordCanvas;
                } else if (fieldName.equals("buttonField")) {
                    IButton button = new IButton();
                    button.setHeight(18);
                    button.setWidth(65);
                    button.setIcon("flags/16/" + record.getAttribute("countryCode") + ".png");
                    button.setTitle("Info");
                    button.addClickHandler(new ClickHandler() {
                        public void onClick(ClickEvent event) {
                            SC.say(record.getAttribute("countryName") + " info button clicked.");
                        }
                    });
                    return button;
                } else {
                    return null;
                }

            }
        };