wx_ref 和自定义 wx_object
我正在 wxErlang 的帮助下开发 MDI 应用程序。我有一个父框架，实现为 wx_object：
-module(main_frame).
-export([new/0, init/1, handle_call/3, handle_event/2, terminate/2]).
-behaviour(wx_object).
....
我有一个子框架，也实现为 wx_object：
module(child_frame).
-export([new/2, init/1, handle_call/3, handle_event/2, terminate/2]).
-export([save/1]).
-behaviour(wx_object).
% some public API method
save(Frame) ->
wx_object:call(Frame, save).
....
我想从父框架调用 save/1 来获取活动子框架。这是我的代码：
ActiveChild = wxMDIParentFrame:getActiveChild(Frame),
case wx:is_null(ActiveChild) of
false ->
child_frame:save(ActiveChild);
_ ->
ignore
end
此代码失败，因为 ActiveChild 是 #wx_ref{} 且 state=[]，但 wx_object:call/2 需要 #wx_ref{}，其中 state 设置为我们调用的进程的 pid。执行此操作的正确方法是什么？我只想在父框架中存储所有创建的子框架及其 pid 的列表，并在此列表中搜索 pid，但这很丑陋。
I am developing MDI application with help of wxErlang. I have a parent frame, implemented as wx_object:
-module(main_frame).
-export([new/0, init/1, handle_call/3, handle_event/2, terminate/2]).
-behaviour(wx_object).
....
And I have a child frame, implemented as wx_object too:
module(child_frame).
-export([new/2, init/1, handle_call/3, handle_event/2, terminate/2]).
-export([save/1]).
-behaviour(wx_object).
% some public API method
save(Frame) ->
wx_object:call(Frame, save).
....
I want to call save/1 for an active child frame from the parent frame. There is my code:
ActiveChild = wxMDIParentFrame:getActiveChild(Frame),
case wx:is_null(ActiveChild) of
false ->
child_frame:save(ActiveChild);
_ ->
ignore
end
This code fails because ActiveChild is #wx_ref{} with state=[], but wx_object:call/2 needs #wx_ref{} where state is set to the pid of the process which we call. What is the right method to do this? I thought only to store a list of all created child frames with its pids in the parent frame and search the pid in this list, but this is ugly.
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评论（1）
您（当前）无法从
获取 erlang 对象/进程
wxMDIParentFrame:getActiveChild(Frame)，您必须将 erlang Child 对象保留在您的状态和活动子对象中，
也可能会随时更新事件。
这里还有改进的空间
You can not (currently) get the erlang object/process from
wxMDIParentFrame:getActiveChild(Frame),You will have to keep the erlang Child objects in your state and the active child,
as well probably keep it updated with events.
There is room for improvment here