GridBagLayout is one of the most flexible — and complex — layout managers the Java platform provides. A GridBagLayout places components in a grid of rows. Following is the declaration for gLayout class − public class GridBagLayout extends Object implements LayoutManager2, Serializable. Component; import ner; import gConstraints; import gLayout; import ; import JButton.
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It calls getChild to find out what component caused jqva event i. So, gridx corresponds gridbaglayoyt 1,2, If no component managed by the GridBagLayout had weightx set, then when the components’ container was made wider, the components would stay clumped together in the center of the container, like this: Returns the maximum dimensions for this layout given the components in the specified target container.
To do so, set the gridwidth and gridheight variables of the GridBagConstraints. Positions five components within a container, using weights, fill, and relative positioning. GridBagLayout Creates a grid bag layout manager.
Set instance variables in the GridBagConstraints instance Not adding width or height when using a method to add the object, will result in a failure, as the object won’t appear. The default value is 1.
Fill the available space in both directions. A GridBagLayout places components in a grid of rows and columns, allowing specified components to span multiple rows or columns. With Safari, you learn the way you learn best. Now that you know the basics, and have the abstract view needed to design Frames using the GridBagLayout, let’s see how to use it for your layout. You can set the following GridBagConstraints instance variables:. Laying Out Components Within a Container.
This field holds the overrides to the row weights. The greatest individual weight becomes the overall weight of the row or column. Determines the origin of the layout area, in the graphics coordinate space of the target container.
The anchor constraint tells a grid bag layout how to position a component within its cell in the grid.
Horizontal, Left-to-Right Figure 3: Lays out the specified container using this grid bag layout. Values that aren’t the default are marked in boldface.
How to Use GridBagLayout
Rather than specifying the constraints with the add method, our examples used to invoke the setConstraints method on the GridBagLayout object. How to Write a Container Listener. This method is obsolete and supplied for backwards compatability only; new code should call getMinSize instead. GridBagLayout is a very flexible layout manager that allows you to position components relative to one another using constraints.
Dimension preferredLayoutSize Container parent Determines the preferred size of the parent container using this grid bag layout. ContainerEventDemo How to Write a Container Listener Positions five components within a container, using weights, fill, and relative positioning. Use is subject to license terms. However, it makes it easier to see exactly how much space each button occupies. BOTH make the component fill its display area entirely. The actual value of these components’ weightx is unimportant.
The new horizontal space is split evenly among all the columns. Rather than grjdbaglayout the constraints with the add method, our examples invoked the setConstraints method on the GridBagLayout object.
There’s a variety for anchors, here’s all of them: For a full list of the possible values of the anchor constraint, including baseline-relative values,see the API documentation for GridBagConstraints. If rowHeights has more elements than the number of rows, rowa are added to the gridbag to match the number of elements in rowHeights. Adds the specified component to the layout, using the specified constraints object.
The situation is a bit more uava when there are multiple rows or columns and when there is even the possibility of components spanning more than one cell. I prefer not using them.
GridBagLayout (Java Platform SE 7 )
Each Gridbahlayout object maintains a dynamic, rectangular grid of cells, with each component occupying one or more cells, called its display area. GridBagLayout doesn’t allow components to span multiple rows unless the component is in the leftmost column or you’ve specified positive gridx and gridy values for the component.
Calculating the weights of rows and columns.