![]() The resulting A should then have the fixed width and A.height + B.height as the height – at least that is what I want. C should have the same fixed width as B but otherwise be of a variable height, depending on how many components are added in the flow. B is highly customized and has a fixed size set via setPreferredSize. I have the following situation: In a panel A are two other panels B with an absolute layout and C with a FlowLayout. It can be hand coded but that wasn’t really what it was designed for.I have an annoying problem with Java’s layout managers. Note that GroupLayout is really designed to be used by GUI builders. It should be noted that the maximum preferred height and width DO NOT have to come from the same component. It searches for the component with the largest preferred width and the component with the largest preferred height and sets all components to that preferred width and height. CENTER component – gets whatever space is left over, if anyīoth CardLayout and GridLayout sizes all of the components in a container it is controlling to be the same size.EAST and WEST components – respects component’s preferred width if possible, height is set to full available height of the container.NORTH and SOUTH components – respects component’s preferred height if possible, width is set to full available width of the container.I recommend not using the hints at first, then if needed make some fine-adjustments with the hints. In practice, if you understand how the layout managers work, you will rarely need to use these. It should be noted that if you find yourself using these properties a lot you are doing something wrong. Sequential Groups–Yes, Parallel Groups–No ![]() Sequential Groups–Yes, Parallel Groups–Sort of (see GroupLayout extra notes) X_AXIS–honors preferred width, Y_AXIS–honors preferred height Sort of (see Card and GridLayout extra notes) Here are the hints that each layout manager supports: Layout Manager GroupLayout – added in Java 1.6, primarily intended to be used by GUI builders.GridLayout – Use when you want things in a grid with the exact same height and width, I have never used one, its use case is so limited I find it to be worthless.I have never found swapping out panels too terrbily difficult so have never used it CardLayout – Many people recommend using this one when you need to swap out one panel for another at runtime when the need arises.Do yourself a favor and immediately change your panel to use BoxLayout instead! I find it unfortunate this is the default layout for JPanels as it is nearly worthless except for quick mockups. FlowLayout – The default layout manager of JPanels.GridBagLayout – avoid like the plague, if you don’t take my advice and try to make a go of it you will find this humorous:. ![]() ![]()
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