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Let’s say you have a JPanel size 200 x 200, with a custom combo-box-type component whose dropdown list should be able to extend outside of the 200 x 200 JPanel.
The problem I’m facing is that the dropdown either doesn’t ‘paint’ outside the bounds of the container, or the container is sized according to the dropdown.
How can I add a component to a container which allows that component to extends beyond the bounds of the container? How does the Java JComboBox do that internally?
Simply use a JPopupMenu for the dropdown. JPopupMenu internally will handle painting at and beyond the edges.