TImageList.ShareImages-如何准确使用而不必复制内容？ [英] TImageList.ShareImages - How to use exactly to not have to copy the content?

问题描述

我使用C ++ Builder，但是这个问题与我相信的Delphi同样重要。

I use C++ Builder, but the question is just as relevant for Delphi I believe.

当我有两个 TImageList 对象，有时我想在两个图像列表中使用相同的图标，我可以复制内容： ImageList2.Assign（ImageList1）;

When I have two TImageList objects and at some point I want to use the same icons in both image lists, I can copy the content: ImageList2.Assign(ImageList1) ;

但是，我在帮助中注意到 TImageList.ShareImages 提示我可以使用相同的内部列表，并节省复制资源！但是记录不佳，因为我不确定如何才能做到这一点？
如何使 ImageList2 使用与 ImageList1 相同的内部列表？ （然后，我会设置 ImageList2.ShareImages = true 。

However, I noticed TImageList.ShareImages in Help suggesting I can use the same internal list, and save resources copying !? Poorly documented however because I'm not sure how I can achieve this exactly ? What do I do to make ImageList2 use the same internal list as ImageList1 ? (I would set ImageList2.ShareImages = true then.

推荐答案

As我阅读了源代码，您是这样做的：

As I read the source code, you do it like this:

ImageList2->Handle = ImageList1->Handle;
ImageList2->ShareImages = true;

所有 ShareImages 控件是图像列表句柄是否为列表所有者，在这种情况下，它由 ImageList1 拥有，而不是 ImageList2 。

All that ShareImages controls is whether or not the image list handle is owner by the list. In this case it is owned by ImageList1 and not by ImageList2.

其结果是， ImageList1 必须退出 ImageList2 ；否则，如果首先销毁 ImageList1 ，则将保留 ImageList2 放在已损坏的图像列表的句柄上。

A consequence of this is that ImageList1 must out live ImageList2. Otherwise if ImageList1 is destroyed first, then ImageList2 is left holding on to a handle of an image list that has been destroyed.

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