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")); } }
If the container's ComponentOrientation property is horizontal and left-to-right, the above example produces the output shown in Figure 1. If the container's ComponentOrientation property is horizontal and right-to-left, the example produces the output shown in Figure 2.
Figure 1: Horizontal, Left-to-Right
Figure 2: Horizontal, Right-to-Left
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 of 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, 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.
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")); } } If the container's ComponentOrientation property is horizontal and left-to-right, the above example produces the output shown in Figure 1. If the container's ComponentOrientation property is horizontal and right-to-left, the example produces the output shown in Figure 2. Figure 1: Horizontal, Left-to-Right Figure 2: Horizontal, Right-to-Left 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 of 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, 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.
(->grid-layout)
(->grid-layout rows cols)
(->grid-layout rows cols hgap vgap)
Constructor.
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 between each of the columns. Vertical gaps are placed 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.
All GridLayout constructors defer to this one.
rows - the rows, with the value zero meaning any number of rows - int
cols - the columns, with the value zero meaning any number of columns - int
hgap - the horizontal gap - int
vgap - the vertical gap - int
throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
Constructor. 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 between each of the columns. Vertical gaps are placed 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. All GridLayout constructors defer to this one. rows - the rows, with the value zero meaning any number of rows - `int` cols - the columns, with the value zero meaning any number of columns - `int` hgap - the horizontal gap - `int` vgap - the vertical gap - `int` throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
(add-layout-component this name comp)
Adds the specified component with the specified name to the layout.
name - the name of the component - java.lang.String
comp - the component to be added - java.awt.Component
Adds the specified component with the specified name to the layout. name - the name of the component - `java.lang.String` comp - the component to be added - `java.awt.Component`
(get-columns this)
Gets the number of columns in this layout.
returns: the number of columns in this layout - int
Gets the number of columns in this layout. returns: the number of columns in this layout - `int`
(get-hgap this)
Gets the horizontal gap between components.
returns: the horizontal gap between components - int
Gets the horizontal gap between components. returns: the horizontal gap between components - `int`
(get-rows this)
Gets the number of rows in this layout.
returns: the number of rows in this layout - int
Gets the number of rows in this layout. returns: the number of rows in this layout - `int`
(get-vgap this)
Gets the vertical gap between components.
returns: the vertical gap between components - int
Gets the vertical gap between components. returns: the vertical gap between components - `int`
(layout-container this parent)
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.
parent - the container in which to do the layout - java.awt.Container
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. parent - the container in which to do the layout - `java.awt.Container`
(minimum-layout-size this parent)
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 all of the components in the container times the number of columns, plus the horizontal padding times the number of columns minus one, plus the left and right insets of the target container.
The minimum height of a grid layout is the largest minimum height of all of the components in the container times the number of rows, plus the vertical padding times the number of rows minus one, plus the top and bottom insets of the target container.
parent - the container in which to do the layout - java.awt.Container
returns: the minimum dimensions needed to lay out the
subcomponents of the specified container - java.awt.Dimension
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 all of the components in the container times the number of columns, plus the horizontal padding times the number of columns minus one, plus the left and right insets of the target container. The minimum height of a grid layout is the largest minimum height of all of the components in the container times the number of rows, plus the vertical padding times the number of rows minus one, plus the top and bottom insets of the target container. parent - the container in which to do the layout - `java.awt.Container` returns: the minimum dimensions needed to lay out the subcomponents of the specified container - `java.awt.Dimension`
(preferred-layout-size this parent)
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 all of the components in the container times the number of columns, plus the horizontal padding times the number of columns minus one, plus the left and right insets of the target container.
The preferred height of a grid layout is the largest preferred height of all of the components in the container times the number of rows, plus the vertical padding times the number of rows minus one, plus the top and bottom insets of the target container.
parent - the container in which to do the layout - java.awt.Container
returns: the preferred dimensions to lay out the
subcomponents of the specified container - java.awt.Dimension
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 all of the components in the container times the number of columns, plus the horizontal padding times the number of columns minus one, plus the left and right insets of the target container. The preferred height of a grid layout is the largest preferred height of all of the components in the container times the number of rows, plus the vertical padding times the number of rows minus one, plus the top and bottom insets of the target container. parent - the container in which to do the layout - `java.awt.Container` returns: the preferred dimensions to lay out the subcomponents of the specified container - `java.awt.Dimension`
(remove-layout-component this comp)
Removes the specified component from the layout.
comp - the component to be removed - java.awt.Component
Removes the specified component from the layout. comp - the component to be removed - `java.awt.Component`
(set-columns this cols)
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.
cols - the number of columns in this layout - int
throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
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. cols - the number of columns in this layout - `int` throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
(set-hgap this hgap)
Sets the horizontal gap between components to the specified value.
hgap - the horizontal gap between components - int
Sets the horizontal gap between components to the specified value. hgap - the horizontal gap between components - `int`
(set-rows this rows)
Sets the number of rows in this layout to the specified value.
rows - the number of rows in this layout - int
throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
Sets the number of rows in this layout to the specified value. rows - the number of rows in this layout - `int` throws: java.lang.IllegalArgumentException - if the value of both rows and cols is set to zero
(set-vgap this vgap)
Sets the vertical gap between components to the specified value.
vgap - the vertical gap between components - int
Sets the vertical gap between components to the specified value. vgap - the vertical gap between components - `int`
(to-string this)
Returns the string representation of this grid layout's values.
returns: a string representation of this grid layout - java.lang.String
Returns the string representation of this grid layout's values. returns: a string representation of this grid layout - `java.lang.String`
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