在另一个 TForm 中嵌入 TForm 时如何避免问题?

问题描述

我经常像这样将一个 TForm 后代嵌入到另一个 TForm 后代中:

I often embed a TForm descendant into another TForm descendant like this:

var
  Form1: TForm1;
  Form2: TForm2;
begin
  Form2.Parent      := Form1;
  Form2.BorderStyle := bsNone;
  Form2.Align       := alClient;
  Form2.Show;
end;

通常这可以正常工作，但有时 Form2 中的控件未正确对齐.此类问题有通用的解决方法吗?

Usually this works just fine, but sometimes the controls in Form2 are not aligned properly. Is there a general workaround for this sort of problem?

有人知道是什么导致了这种错位"?

Does anybody know what is causing this "misalignment"?

我知道我可以使用 TFrame 来完成这种工作，但是我有很多必须重写的库代码，而且我看不出为什么使用 TFormTForm 方法中的 应该不起作用吗?

I know that I could use TFrame for this kind of job, but I have a lot of library code that I would have to rewrite and I do not see any reason why the TForm in TForm approach should not work?

我已经确定组件 TcxListView 是这里的罪魁祸首，我已向组件供应商 (DevExpress) 提交了错误报告:

I have identified the component TcxListView as the culprit here, I have submitted a bug report to the component vendor (DevExpress):

http://www.devexpress.com/issue=B194161

Edit 2: DevExpress 的开发人员分析了这个问题，并说它实际上是 Embarcadero 的 TGridPanel 组件中的一个缺陷:

Edit 2: The developers at DevExpress have analyzed the problem and said that it is actually a defect in the TGridPanel component by Embarcadero:

http://qc.embarcadero.com/wc/qcmain.aspx?d=90324

推荐答案

我也这样做，我使用以下例程来实现它:

I do this as well and I use the following routine to make it happen:

procedure TMyForm.PlaceInsideContainer(Container: TWinControl);
begin
  Parent := Container;
  Align := alClient;
  BorderIcons := [];
  BorderStyle := bsNone;
  ParentBackground := True;
  Show;
end;

我对此没有任何问题.我可以想象的唯一可能相关的区别是 BorderIcons 的分配，但我怀疑这会导致问题.

I have no problems with this. The only difference that I could possibly imagine could be relevant is the assignment of BorderIcons, but I would doubt that causes a problem.

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