CL_GUI_ALV_TREE链接单击节点

Question

我想在链接单击节点上捕获事件。 我知道如何设置链接单击列项目，就像：

DATA: ls_layout TYPE lvc_s_layi,
      lt_layout TYPE lvc_t_layi.

ls_layout-fieldname = 'Fieldname from table passing to alv tree'.
ls_layout-class = cl_gui_column_tree=>item_class_link.
APPEND ls_layout to lt_layout.

 o_cl_gui_tree->add_node(
    EXPORTING
      "other parameters...
      it_item_layout       = lt_layout
      "other parameters...
  ).

但是我不知道如何设置链接单击节点。 你可以帮帮我吗？ 谢谢。

Answer 1

我不明白，与所有其他事件处理实践相比，在此事件处理案例中应该有什么困难/不同之处。 但这也许是我自己的错。 因此，让我们一起逐步进行。 观看并学习。 :-)

事件接收器的定义如下所示：

CLASS lcl_tree_event_receiver DEFINITION.
PUBLIC SECTION.
.
.
.
 METHODS handle_link_click
  FOR EVENT link_click OF cl_gui_alv_tree
  IMPORTING node_key
            fieldname.

ENDCLASS.

让我们实现该类。

CLASS lcl_tree_event_receiver IMPLEMENTATION.
.
.
.
 METHOD handle_link_click.
    " Do whatever You want in here. 
ENDMETHOD.                    "handle_link_click
ENDCLASS.

树事件的激活应传递正确的ID

  DATA: lt_events TYPE cntl_simple_events,
  l_event   TYPE cntl_simple_event.
  .
  .
  l_event-eventid = cl_gui_column_tree=>EVENTID_LINK_CLICK.
  " yes, that works, in fact this constant is inside 
  " CL_ITEM_TREE_CONTROL

  APPEND l_event TO lt_events.
   CALL METHOD go_main_tree->set_registered_events
EXPORTING
  events                    = lt_events
EXCEPTIONS
  cntl_error                = 1
  cntl_system_error         = 2
  illegal_event_combination = 3.

最后，我们实例化处理程序类并注册处理程序，如下所示：

  DATA: l_tree_event_receiver TYPE REF TO lcl_tree_event_receiver.
  CREATE OBJECT   l_tree_event_receiver.


   SET HANDLER l_tree_event_receiver->handle_link_click.
   FOR go_main_tree.

如果您想查看哪些方法可以设置事件，请致电

   CALL METHOD go_main_tree->get_registered_events
   IMPORTING
     events = lt_events.