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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To do so, we must take two steps: And before setting the constraints of the next component, the code resets the value of ipady to the default:.
So, gridx corresponds to 1,2, What matters is that all the components, and consequently, all the columns, have an equal weight that is greater than 0. For button one, we set gridheight to 2 ; therefore, it is two cells high. The post will be divided in 3 sections; Basics, Recommendations and Frequent Errors. However, it makes it easier to see exactly how much space each button occupies.
Using GridBagConstraints : GridBagConstraints « Swing « Java Tutorial
GridBagLayout is a Layout Managerand one of the most complex managers. The Tutorial’s examples used to specify the constraints object a different way, which you might see in other programs as well. Unless you specify at least one nonzero value for weightx or weightyall the components clump together in the center of their container.
This method is the same as getMinSize ; refer to getMinSize for details on parameters and return value. All of this referring to Excel of course. If this field is non- null the values are applied to the gridbag after all of the minimum columns widths have been calculated. To build the buttons for the digits 1—9, we use a doubly nested loop. This resizing behavior is based on weights the program assigns to individual components in the GridBagLayout.
Determines the minimum size of the parent container using this grid bag layout. GridBagLayout for using the Layout import java. Determines column widths and row heights for the layout grid.
The new horizontal space is split evenly among all the columns. Therefore, topRow has its own layout manager, with three horizontal cells, allowing each button in the row to have a grid width of 1. The next section discusses constraints in depth, in the context of explaining how the example program works.
Instead, describe the problem and what has hridbaglayout done so far to solve it. This function is used for extending the object to the gridsize, and it is very useful when your Windows is resizable. You customize a GridBagConstraints object by setting one or more of its instance variables: Positions five components within a container, using weights, fill, and relative positioning.
This gridbaglayotu is gridbaglayyout same as arrangeGrid ; refer to arrangeGrid for details on the parameter.
GridBagLayout – Learning Java, 4th Edition [Book]
Controls the number of rows or columns the component spans. Previous releases require values named after points of the compass. The overall orientation of the grid depends on the container’s ComponentOrientation property.
You can find examples of using GridBagLayout throughout this tutorial. The actual value of these components’ weightx is unimportant. The return value is not a copy, but is the actual GridBagConstraints object used by the layout mechanism.
If you enlarge the window as shown in the following gridbaglayiut, you’ll notice that the bottom row, which contains Button 5, gets all the new vertical space. This is because when the weight is 0. For example, an anchor of GridBagConstraints. A comp value of null is invalid and returns null. It implements only the user interface i.
Horizontal, Left-to-Right Figure 3: Each GridBagLayout object maintains a dynamic, rectangular grid of cells, with each component occupying one or more cells, called its display area.
If a component’s display area is larger than the component itself, then you can specify whereabouts in the display area the component will be displayed by using the GridBagConstraints. This method reshapes components in the specified container gridbaglayour order to satisfy the contraints of this GridBagLayout object.
If no error occurs, it means the compilation is successful. Resizable components positioned on the baseline with a baseline-resize behavior of OTHER are only resized if the baseline at the resized size fits within the display area. This puts the component in the container and griidbaglayout the GridBagConstraints object with it:. This is the default. You’ll see a more detailed example in the next section. The way the program specifies the size and position characteristics of its components is by specifying constraints for each component.
The users who voted to close gave this specific reason: Retrieves the hava for the specified component. This also caches the minsizes for all the children when they are first encountered so subsequent loops don’t need to ask again. All the components in the pane container are as wide as possible, given the cells that they occupy.
Just before each component is added to the container, the code sets or resets to default values the appropriate instance variables in the GridBagConstraints object.
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: The following code creates the GridBagLayout and the components it manages. The situation is a bit more complicated when there are multiple rows or columns and when there is even the possibility of components spanning more than one cell.