The attached screenshot consists of 2 JPanels. Each has 2 JLists. I want to allow drag and drop only inside one JPanel. For instance drops from TopPanel to ButtomPanel or complete outside to desktop or something else should NOT be allowed. My solution already works panel specific, but drops outside are still possible. How can I deactivate that? Here is the standalone example code:
subject: Restrict drops to JPanel where it's drags are from.