java - GWT CellList 渲染完成处理程序？

Question

我使用 GWT CellList 小部件来呈现 Cell 元素。

有没有办法注册渲染完成或渲染完成事件以在渲染完成后执行内容？

Answer 1

我有同样的问题，并查看了代码，我找到了可能的解决方案。

在HasDataPresenter中，有将单元格渲染到 View 中的代码(方法resolvePendingState(JsArrayInteger moddedRows):

if (redrawRequired) {
        // Redraw the entire content.
        SafeHtmlBuilder sb = new SafeHtmlBuilder();
        view.replaceAllChildren(newState.rowData, selectionModel, newState.keyboardStealFocus);
        view.resetFocus();
      } else if (range0 != null) {
        // Surgically replace specific rows.

        // Replace range0.
        {
          int absStart = range0.getStart();
          int relStart = absStart - pageStart;
          SafeHtmlBuilder sb = new SafeHtmlBuilder();
          List<T> replaceValues = newState.rowData.subList(relStart, relStart + range0.getLength());
          view.replaceChildren(replaceValues, relStart, selectionModel, newState.keyboardStealFocus);
        }

        // Replace range1 if it exists.
        if (range1 != null) {
          int absStart = range1.getStart();
          int relStart = absStart - pageStart;
          SafeHtmlBuilder sb = new SafeHtmlBuilder();
          List<T> replaceValues = newState.rowData.subList(relStart, relStart + range1.getLength());
          view.replaceChildren(replaceValues, relStart, selectionModel, newState.keyboardStealFocus);
        }

        view.resetFocus();

view.replaceAllChildren(....) 方法调用渲染单元格的 render 方法，完成后会触发 ValueChangeEvent()。

@Override
public void replaceAllChildren(....) {
  SafeHtml html = renderRowValues(...);

  ....

  fireValueChangeEvent();
}

因此，在您的 cellList 中，您应该执行以下操作:

   cellList.addHandler(new ValueChangeHandler<List<IPost>>() {

        @Override
        public void onValueChange(ValueChangeEvent<List<IPost>> event) {
          //Do something
          //Be careful because this handler could be called from other methods

        }
      }, ValueChangeEvent.getType());