Imagine that the glue spreads out, pushing anything it encounters away. Notice the first and last component to be added here are calls to Box.createVerticalGlue(). In the north east quadrant, two buttons are arranged with a BoxLayout manager. Priority: P4 Status: Closed Resolution: Wont Fix OS: windows2000. An entire layout manager is being used here to constrain the height all of the other regions of this BorderLayout are empty. Component: client-libs Sub-Component: javax.swing Affected Version: 1.4.2,6u14. The NORTH region of BorderLayout respects the preferred height of what it contains. This technique keeps the height of these two controls fixed, so that the text area does not resize vertically. Only the NORTH region of this BorderLayout is utilized. This row is added to a JPanel with a BorderLayout. In the north west quadrant (top left), a label and a text area are placed within a row with a horizontal BoxLayout. In the above example, a number of techniques are demonstrated. Observe how the components move as you resize, then experiment and change the code with alternate layout techniques to get a feel for how they work. Try running the code and resize the frame. Import javax.swing.* public class NestedExample extends JFrame Observe that there are two JPanels used for horizontal placement, and a single main JPanel into which both are placed. ![]() The example below uses nested JPanels to control layout. Organizing your components into logical groups also makes the overall user interface easier to navigate. If two components belong together both logically and physically they should be organized by a layout manager within a JPanel. In the design of your interface you should break down your initial paper sketch of your display into groups of associated components. Instead of looking at the screen as a number of widgets which belong at specific positions, imagine the screen as a number of organized sections, each of which is broken down into further organized sections. The first secret to working with the standard Layout managers is to utilize JPanel. SpringLayout is appropriate for specifying the corner relationships of many components, but the four layout managers above offer enough strength for complex user interfaces. The CardLayout is extremely useful for flipping between visible sets of components, and the GridBagLayout is tailored for components spanning multiple cells of a grid. Unlike the GridLayout, vertically arranged components are not resized horizontally, and vice versa. Any series of components would be well served by utilizing this manager. This is the most commonly used layout manager for straightforward relative positioning of components.īoxLayout A perfect layout manager for organizing elements either vertically or horizontally, as designated by the constructor. You can optionally use any subset of these regions making it a powerful organizer of relative elements. Components can be separated with default spacing as specified in the call to the constructor.īorderLayout This layout has NORTH, SOUTH, EAST, WEST, and CENTER regions. GridLayout will resize everything it can get its hands on to equally sized areas. GridLayout This manager organizes all of its elements in a rectangular grid with equally sized cells. JPanel uses FlowLayout as the default layout manager. This manager is not suitable for anything besides simple dialogs because of the uncertainty of final placement. You can define your own layout managers, and you should do so for large applications demanding a consistent look, but for the purposes of this article we are going to look at utilizing some of the standard layout managers.įlowLayout This manager places items left to right and slides the components to the next line when it runs out of horizontal space. Layout managers allow us to create code which, can easily be upgraded and utilized on different displays. If someone were to change the wording on one of the labels of your interface, the entire look would become disjointed. Different LookAndFeel packages may display components in unusable ways with hard coded size and positions. It is difficult to maintain code and dangerous for long term usability when you utilize components at specific absolute locations. It is because of these vexing matters we turn to layout managers: Everything can go in its proper place once you know where that place is. ![]() On other occasions, you may find yourself adding a lot of widgets to your container only to find them crawling around like rascally kittens during resizing. ![]() MainFrame = JFrame("Kotlin SWING Resize").When you first add a number of components to your Java user interface, you may find yourself asking: Where did some of them go? ![]() Private lateinit var controlPanel: JPanel I think that what you are looking for is (int, int) if you are resizing any component (JPane, JButton, etc), or (int, int) for a JFrame or JWindow.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |