在其他组件之间的Java Swing中插入组件的最快方法是什么？

Question

I'm making a kind of editor which have a blocks (JPanel's) instead of words (with text-like flow and cursor - blinking JPanel).

I need a fast way to add a Swing component (new block) between existing components in situations like:

• mouse click between JPanels to place cursor there
• add new block element between existing elements.

The problem is, that rebuilding document (.removeAll() and .add() all blocks) take 3-4 seconds with document containing 300-400 blocks.

I can easily speed up cursor positioning, by inserting empty blocks between each block and place cursor there, but what if I need a new clean block between existing blocks ?

I know that some way is to create my own "rendering engine" but can I achieve this a lot easier with swing components ?

Answer 1

I would say you should add just one block with proper constraint. Then it's task of LayoutManager to place the block correctly between another and layout all the children components.

Answer 2

您需要编写自己的LayoutManager。