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Java GridBagLayout

The Java GridBagLayout class is used to align components vertically, horizontally or along their baseline.

The components may not be of the same size. Each GridBagLayout object maintains a dynamic, rectangular grid of cells. Each component occupies one or more cells known as its display area. Each component associates an instance of GridBagConstraints. With the help of the constraints object, we arrange the component’s display area on the grid. The GridBagLayout manages each component’s minimum and preferred sizes in order to determine the component’s size. GridBagLayout components are also arranged in the rectangular grid but can have many different sizes and can occupy multiple rows or columns.

Constructor

GridBagLayout(): The parameterless constructor is used to create a grid bag layout manager.

GridBagLayout Fields

Modifier and Type
Field
Description

double[]
columnWeights
It is used to hold the overrides to the column weights.

int[]
columnWidths
It is used to hold the overrides to the column minimum width.

protected Hashtable<Component,GridBagConstraints>
comptable
It is used to maintains the association between a component and its gridbag constraints.

protected GridBagConstraints
defaultConstraints
It is used to hold a gridbag constraints instance containing the default values.

protected GridBagLayoutInfo
layoutInfo
It is used to hold the layout information for the gridbag.

protected static int
MAXGRIDSIZE
No longer in use just for backward compatibility

protected static int
MINSIZE
It is smallest grid that can be laid out by the grid bag layout.

protected static int
PREFERREDSIZE
It is preferred grid size that can be laid out by the grid bag layout.

int[]
rowHeights
It is used to hold the overrides to the row minimum heights.

double[]
rowWeights
It is used to hold the overrides to the row weights.

GridBagLayout Methods

Modifier and Type
Method
Description

void
addLayoutComponent(Component comp, Object constraints)
It adds specified component to the layout, using the specified constraints object.

void
addLayoutComponent(String name, Component comp)
It has no effect, since this layout manager does not use a per-component string.

protected void
adjustForGravity(GridBagConstraints constraints, Rectangle r)
It adjusts the x, y, width, and height fields to the correct values depending on the constraint geometry and pads.

protected void
AdjustForGravity(GridBagConstraints constraints, Rectangle r)
This method is for backwards compatibility only

protected void
arrangeGrid(Container parent)
Lays out the grid.

protected void
ArrangeGrid(Container parent)
This method is obsolete and supplied for backwards compatibility

GridBagConstraints
getConstraints(Component comp)
It is for getting the constraints for the specified component.

float
getLayoutAlignmentX(Container parent)
It returns the alignment along the x axis.

float
getLayoutAlignmentY(Container parent)
It returns the alignment along the y axis.

int[][]
getLayoutDimensions()
It determines column widths and row heights for the layout grid.

protected GridBagLayoutInfo
getLayoutInfo(Container parent, int sizeflag)
This method is obsolete and supplied for backwards compatibility.

protected GridBagLayoutInfo
GetLayoutInfo(Container parent, int sizeflag)
This method is obsolete and supplied for backwards compatibility.

Point
getLayoutOrigin()
It determines the origin of the layout area, in the graphics coordinate space of the target container.

double[][]
getLayoutWeights()
It determines the weights of the layout grid’s columns and rows.

protected Dimension
getMinSize(Container parent, GridBagLayoutInfo info)
It figures out the minimum size of the master based on the information from getLayoutInfo.

protected Dimension
GetMinSize(Container parent, GridBagLayoutInfo info)
This method is obsolete and supplied for backwards compatibility only

Example 1

FileName: GridBagLayoutExample.java

Output:

Example 2

FileName: GridBagLayoutDemo.java

Output:

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Java GroupLayout

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