| java.lang.Object
 java.awt.GridLayout
| GridLayout | | public class GridLayout implements LayoutManager,java.io.Serializable(Code) | | The GridLayout class is a layout manager that
lays out a container's components in a rectangular grid.
The container is divided into equal-sized rectangles,
and one component is placed in each rectangle.
For example, the following is an applet that lays out six buttons
into three rows and two columns:
import java.awt.*;
import java.applet.Applet;
public class ButtonGrid extends Applet {
public void init() {
setLayout(new GridLayout(3,2));
add(new Button("1"));
add(new Button("2"));
add(new Button("3"));
add(new Button("4"));
add(new Button("5"));
add(new Button("6"));
}
}
It produces the following output:
When both the number of rows and the number of columns have
been set to non-zero values, either by a constructor or
by the setRows and setColumns methods, the number of
columns specified is ignored. Instead, the number of
columns is determined from the specified number or rows
and the total number of components in the layout. So, for
example, if three rows and two columns have been specified
and nine components are added to the layout, then they will
be displayed as three rows of three columns. Specifying
the number of columns affects the layout only when the
number of rows is set to zero.
version:
1.21, 03/01/01
since:
JDK1.0 |
| Constructor Summary | |
| public | GridLayout()
Creates a grid layout with a default of one column per component,
in a single row. | | public | GridLayout(int rows, int cols)
Creates a grid layout with the specified number of rows and
columns. | | public | GridLayout(int rows, int cols, int hgap, int vgap)
Creates a grid layout with the specified number of rows and
columns. |
| Method Summary | |
| public void | addLayoutComponent(String name, Component comp)
Adds the specified component with the specified name to the layout. | | public int | getColumns()
Gets the number of columns in this layout. | | public int | getHgap()
Gets the horizontal gap between components. | | public int | getRows()
Gets the number of rows in this layout. | | public int | getVgap()
Gets the vertical gap between components. | | public void | layoutContainer(Container parent)
Lays out the specified container using this layout. | | public Dimension | minimumLayoutSize(Container parent)
Determines the minimum size of the container argument using this
grid layout. | | public Dimension | preferredLayoutSize(Container parent)
Determines the preferred size of the container argument using
this grid layout. | | public void | removeLayoutComponent(Component comp)
Removes the specified component from the layout. | | public void | setColumns(int cols)
Sets the number of columns in this layout to the specified value. | | public void | setHgap(int hgap)
Sets the horizontal gap between components to the specified value. | | public void | setRows(int rows)
Sets the number of rows in this layout to the specified value. | | public void | setVgap(int vgap)
Sets the vertical gap between components to the specified value. | | public String | toString()
Returns the string representation of this grid layout's values. |
| GridLayout | | public GridLayout()(Code) | | Creates a grid layout with a default of one column per component,
in a single row.
since:
JDK1.1 |
| GridLayout | | public GridLayout(int rows, int cols)(Code) | | Creates a grid layout with the specified number of rows and
columns. All components in the layout are given equal size.
One, but not both, of rows and cols can
be zero, which means that any number of objects can be placed in a
row or in a column.
Parameters:
rows - the rows, with the value zero meaning any number of rows.
Parameters:
cols - the columns, with the value zero meaning any number of columns.
since:
JDK1.0 |
| GridLayout | | public GridLayout(int rows, int cols, int hgap, int vgap)(Code) | | Creates a grid layout with the specified number of rows and
columns. All components in the layout are given equal size.
In addition, the horizontal and vertical gaps are set to the
specified values. Horizontal gaps are placed at the left and
right edges, and between each of the columns. Vertical gaps are
placed at the top and bottom edges, and between each of the rows.
One, but not both, of rows and cols can
be zero, which means that any number of objects can be placed in a
row or in a column.
Parameters:
rows - the rows, with the value zero meaning any number of rows.
Parameters:
cols - the columns, with the value zero meaning any number of columns.
Parameters:
hgap - the horizontal gap.
Parameters:
vgap - the vertical gap.
exception:
IllegalArgumentException - if the of rows or cols is invalid.
since:
JDK1.0 |
| addLayoutComponent | | public void addLayoutComponent(String name, Component comp)(Code) | | Adds the specified component with the specified name to the layout.
Parameters:
name - the name of the component.
Parameters:
comp - the component to be added.
since:
JDK1.0 |
| getColumns | | public int getColumns()(Code) | | Gets the number of columns in this layout.
the number of columns in this layout.
since:
JDK1.1 |
| getHgap | | public int getHgap()(Code) | | Gets the horizontal gap between components.
the horizontal gap between components.
since:
JDK1.1 |
| getRows | | public int getRows()(Code) | | Gets the number of rows in this layout.
the number of rows in this layout.
since:
JDK1.1 |
| getVgap | | public int getVgap()(Code) | | Gets the vertical gap between components.
the vertical gap between components.
since:
JDK1.1 |
| layoutContainer | | public void layoutContainer(Container parent)(Code) | | Lays out the specified container using this layout.
This method reshapes the components in the specified target
container in order to satisfy the constraints of the
GridLayout object.
The grid layout manager determines the size of individual
components by dividing the free space in the container into
equal-sized portions according to the number of rows and columns
in the layout. The container's free space equals the container's
size minus any insets and any specified horizontal or vertical
gap. All components in a grid layout are given the same size.
Parameters:
target - the container in which to do the layout.
See Also: java.awt.Container
See Also: java.awt.Container.doLayout
since:
JDK1.0 |
| minimumLayoutSize | | public Dimension minimumLayoutSize(Container parent)(Code) | | Determines the minimum size of the container argument using this
grid layout.
The minimum width of a grid layout is the largest minimum width
of any of the widths in the container times the number of columns,
plus the horizontal padding times the number of columns plus one,
plus the left and right insets of the target container.
The minimum height of a grid layout is the largest minimum height
of any of the widths in the container times the number of rows,
plus the vertical padding times the number of rows plus one, plus
the top and left insets of the target container.
Parameters:
target - the container in which to do the layout. the minimum dimensions needed to lay out the subcomponents of the specified container.
See Also: java.awt.GridLayout.preferredLayoutSize
See Also: java.awt.Container.doLayout
since:
JDK1.0 |
| preferredLayoutSize | | public Dimension preferredLayoutSize(Container parent)(Code) | | Determines the preferred size of the container argument using
this grid layout.
The preferred width of a grid layout is the largest preferred
width of any of the widths in the container times the number of
columns, plus the horizontal padding times the number of columns
plus one, plus the left and right insets of the target container.
The preferred height of a grid layout is the largest preferred
height of any of the widths in the container times the number of
rows, plus the vertical padding times the number of rows plus one,
plus the top and left insets of the target container.
Parameters:
target - the container in which to do the layout. the preferred dimensions to lay out the subcomponents of the specified container.
See Also: java.awt.GridLayout.minimumLayoutSize
See Also:
See Also: java.awt.Container.getPreferredSize
since:
JDK1.0 |
| removeLayoutComponent | | public void removeLayoutComponent(Component comp)(Code) | | Removes the specified component from the layout.
Parameters:
comp - the component to be removed.
since:
JDK1.0 |
| setColumns | | public void setColumns(int cols)(Code) | | Sets the number of columns in this layout to the specified value.
Setting the number of columns has no affect on the layout
if the number of rows specified by a constructor or by
the setRows method is non-zero. In that case, the number
of columns displayed in the layout is determined by the total
number of components and the number of rows specified.
Parameters:
cols - the number of columns in this layout.
exception:
IllegalArgumentException - if the value of both rows and cols is set to zero.
since:
JDK1.1 |
| setHgap | | public void setHgap(int hgap)(Code) | | Sets the horizontal gap between components to the specified value.
Parameters:
hgap - the horizontal gap between components.
since:
JDK1.1 |
| setRows | | public void setRows(int rows)(Code) | | Sets the number of rows in this layout to the specified value.
Parameters:
rows - the number of rows in this layout.
exception:
IllegalArgumentException - if the value of both rows and cols is set to zero.
since:
JDK1.1 |
| setVgap | | public void setVgap(int vgap)(Code) | | Sets the vertical gap between components to the specified value.
Parameters:
vgap - the vertical gap between components.
since:
JDK1.1 |
| toString | | public String toString()(Code) | | Returns the string representation of this grid layout's values.
a string representation of this grid layout.
since:
JDK1.0 |
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