Spec-Zone .ru
спецификации, руководства, описания, API
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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java.lang.Object | +--java.awt.GridLayout
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.
Constructor Summary | |
GridLayout()
Creates a grid layout with a default of one column per component, in a single row. |
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GridLayout(int rows,
int cols)
Creates a grid layout with the specified number of rows and columns. |
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GridLayout(int rows,
int cols,
int hgap,
int vgap)
Creates a grid layout with the specified number of rows and columns. |
Method Summary | |
void |
addLayoutComponent(String name,
Component comp)
Adds the specified component with the specified name to the layout. |
int |
getColumns()
Gets the number of columns in this layout. |
int |
getHgap()
Gets the horizontal gap between components. |
int |
getRows()
Gets the number of rows in this layout. |
int |
getVgap()
Gets the vertical gap between components. |
void |
layoutContainer(Container parent)
Lays out the specified container using this layout. |
Dimension |
minimumLayoutSize(Container parent)
Determines the minimum size of the container argument using this grid layout. |
Dimension |
preferredLayoutSize(Container parent)
Determines the preferred size of the container argument using this grid layout. |
void |
removeLayoutComponent(Component comp)
Removes the specified component from the layout. |
void |
setColumns(int cols)
Sets the number of columns in this layout to the specified value. |
void |
setHgap(int hgap)
Sets the horizontal gap between components to the specified value. |
void |
setRows(int rows)
Sets the number of rows in this layout to the specified value. |
void |
setVgap(int vgap)
Sets the vertical gap between components to the specified value. |
String |
toString()
Returns the string representation of this grid layout's values. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public GridLayout()
public GridLayout(int rows, int cols)
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.
rows
- the rows, with the value zero meaning
any number of rows.cols
- the columns, with the value zero meaning
any number of columns.public GridLayout(int rows, int cols, int hgap, int vgap)
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.
rows
- the rows, with the value zero meaning
any number of rows.cols
- the columns, with the value zero meaning
any number of columns.hgap
- the horizontal gap.vgap
- the vertical gap.IllegalArgumentException
- if the of rows
or cols
is invalid.Method Detail |
public int getRows()
public void setRows(int rows)
rows
- the number of rows in this layout.IllegalArgumentException
- if the value of both
rows
and cols
is set to zero.public int getColumns()
public void setColumns(int cols)
cols
- the number of columns in this layout.IllegalArgumentException
- if the value of both
rows
and cols
is set to zero.public int getHgap()
public void setHgap(int hgap)
hgap
- the horizontal gap between components.public int getVgap()
public void setVgap(int vgap)
vgap
- the vertical gap between components.public void addLayoutComponent(String name, Component comp)
addLayoutComponent
in interface LayoutManager
name
- the name of the component.comp
- the component to be added.public void removeLayoutComponent(Component comp)
removeLayoutComponent
in interface LayoutManager
comp
- the component to be removed.public Dimension preferredLayoutSize(Container parent)
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 heights in the container times the number of rows, plus the vertical padding times the number of rows plus one, plus the top and bottom insets of the target container.
preferredLayoutSize
in interface LayoutManager
target
- the container in which to do the layout.minimumLayoutSize(java.awt.Container)
,
Container.getPreferredSize()
public Dimension minimumLayoutSize(Container parent)
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 heights in the container times the number of rows, plus the vertical padding times the number of rows plus one, plus the top and bottom insets of the target container.
minimumLayoutSize
in interface LayoutManager
target
- the container in which to do the layout.preferredLayoutSize(java.awt.Container)
,
Container.doLayout()
public void layoutContainer(Container parent)
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.
layoutContainer
in interface LayoutManager
target
- the container in which to do the layout.Container
,
Container.doLayout()
public String toString()
toString
in class Object
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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