FormLayout (JGoodies Forms 1.8 API)

java.lang.Object
- com.jgoodies.forms.layout.FormLayout

All Implemented Interfaces:

LayoutManager, LayoutManager2, Serializable
```
public final class FormLayout
extends Object
implements LayoutManager2, Serializable
```
FormLayout is a powerful, flexible and precise general purpose layout manager. It aligns components vertically and horizontally in a dynamic rectangular grid of cells, with each component occupying one or more cells. A whitepaper about the FormLayout ships with the product documentation and is available online.
To use FormLayout you first define the grid by specifying the columns and rows. In a second step you add components to the grid. You can specify columns and rows via human-readable String descriptions or via arrays of ColumnSpec and RowSpec instances.
Each component managed by a FormLayout is associated with an instance of CellConstraints. The constraints object specifies where a component should be located on the form's grid and how the component should be positioned. In addition to its constraints object the FormLayout also considers each component's minimum and preferred sizes in order to determine a component's size.
FormLayout has been designed to work with non-visual builders that help you specify the layout and fill the grid. For example, the ButtonBarBuilder assists you in building button bars; it creates a standardized FormLayout and provides a minimal API that specializes in adding buttons and Actions. Other builders can create frequently used panel design, for example a form that consists of rows of label-component pairs.
FormLayout has been prepared to work with different types of sizes as defined by the Size interface.
Example 1 (Plain FormLayout):
The following example creates a panel with 3 data columns and 3 data rows; the columns and rows are specified before components are added to the form.
```
 FormLayout layout = new FormLayout(
      "right:pref, 6dlu, 50dlu, 4dlu, default",  // columns
      "pref, 3dlu, pref, 3dlu, pref");           // rows

 JPanel panel = new JPanel(layout);
 panel.add(new JLabel("Label1"),   CC.xy  (1, 1));
 panel.add(new JTextField(),       CC.xywh(3, 1, 3, 1));
 panel.add(new JLabel("Label2"),   CC.xy  (1, 3));
 panel.add(new JTextField(),       CC.xy  (3, 3));
 panel.add(new JLabel("Label3"),   CC.xy  (1, 5));
 panel.add(new JTextField(),       CC.xy  (3, 5));
 panel.add(new JButton("/u2026"),  CC.xy  (5, 5));
 return panel;
 
```
Example 2 (Using PanelBuilder):
This example creates the same panel as above using the PanelBuilder to add components to the form.
```
 FormLayout layout = new FormLayout(
      "right:pref, 6dlu, 50dlu, 4dlu, default",  // columns
      "pref, 3dlu, pref, 3dlu, pref");           // rows

 PanelBuilder builder = new PanelBuilder(layout);
 builder.addLabel("Label1",         CC.xy  (1, 1));
 builder.add(new JTextField(),      CC.xywh(3, 1, 3, 1));
 builder.addLabel("Label2",         CC.xy  (1, 3));
 builder.add(new JTextField(),      CC.xy  (3, 3));
 builder.addLabel("Label3",         CC.xy  (1, 5));
 builder.add(new JTextField(),      CC.xy  (3, 5));
 builder.add(new JButton("/u2026"), CC.xy  (5, 5));
 return builder.getPanel();
 
```
Example 3 (Using DefaultFormBuilder):
This example utilizes the DefaultFormBuilder that ships with the source distribution.
```
 FormLayout layout = new FormLayout(
      "right:pref, 6dlu, 50dlu, 4dlu, default"); // 5 columns; add rows later

 DefaultFormBuilder builder = new DefaultFormBuilder(layout);
 builder.append("Label1", new JTextField(), 3);
 builder.append("Label2", new JTextField());
 builder.append("Label3", new JTextField());
 builder.append(new JButton("/u2026"));
 return builder.getPanel();
 
```
Version:

$Revision: 1.30 $

Author:

Karsten Lentzsch

See Also:
ColumnSpec, RowSpec, CellConstraints, AbstractFormBuilder, ButtonBarBuilder, DefaultFormBuilder, FormSpecs, Size, Sizes, Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`FormLayout.LayoutInfo` Stores column and row origins.
`static interface`	`FormLayout.Measure` An interface that describes how to measure a `Component`.

Constructor Summary

Constructors
Constructor and Description
`FormLayout()` Constructs an empty FormLayout.
`FormLayout(ColumnSpec[] colSpecs)` Constructs a FormLayout using the given column specifications.
`FormLayout(ColumnSpec[] colSpecs, RowSpec[] rowSpecs)` Constructs a FormLayout using the given column and row specifications.
`FormLayout(String encodedColumnSpecs)` Constructs a FormLayout using the given encoded column specifications.
`FormLayout(String encodedColumnSpecs, LayoutMap layoutMap)` Constructs a FormLayout using the given encoded column specifications and LayoutMap.
`FormLayout(String encodedColumnSpecs, String encodedRowSpecs)` Constructs a FormLayout using the given encoded column and row specifications and the default LayoutMap.
`FormLayout(String encodedColumnSpecs, String encodedRowSpecs, LayoutMap layoutMap)` Constructs a FormLayout using the given encoded column and row specifications and the given LayoutMap.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addGroupedColumn(int columnIndex)` Adds the specified column index to the last column group.
`void`	`addGroupedRow(int rowIndex)` Adds the specified row index to the last row group.
`void`	`addLayoutComponent(Component comp, Object constraints)` Adds the specified component to the layout, using the specified `constraints` object.
`void`	`addLayoutComponent(String name, Component component)` Throws an `UnsupportedOperationException`.
`void`	`appendColumn(ColumnSpec columnSpec)` Appends the given column specification to the right hand side of all columns.
`void`	`appendRow(RowSpec rowSpec)` Appends the given row specification to the bottom of all rows.
`int`	`getColumnCount()` Returns the number of columns in this layout.
`int[][]`	`getColumnGroups()` Returns a deep copy of the column groups.
`ColumnSpec`	`getColumnSpec(int columnIndex)` Returns the `ColumnSpec` at the specified column index.
`CellConstraints`	`getConstraints(Component component)` Looks up and returns the constraints for the specified component.
`boolean`	`getHonorsVisibility()` Returns whether invisible components shall be taken into account by this layout.
`float`	`getLayoutAlignmentX(Container parent)` Returns the alignment along the x axis.
`float`	`getLayoutAlignmentY(Container parent)` Returns the alignment along the y axis.
`FormLayout.LayoutInfo`	`getLayoutInfo(Container parent)` Computes and returns the horizontal and vertical grid origins.
`int`	`getRowCount()` Returns the number of rows in this layout.
`int[][]`	`getRowGroups()` Returns a deep copy of the row groups.
`RowSpec`	`getRowSpec(int rowIndex)` Returns the `RowSpec` at the specified row index.
`void`	`insertColumn(int columnIndex, ColumnSpec columnSpec)` Inserts the specified column at the specified position.
`void`	`insertRow(int rowIndex, RowSpec rowSpec)` Inserts the specified column at the specified position.
`void`	`invalidateLayout(Container target)` Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
`void`	`layoutContainer(Container parent)` Lays out the specified container using this form layout.
`Dimension`	`maximumLayoutSize(Container target)` Returns the maximum dimensions for this layout given the components in the specified target container.
`Dimension`	`minimumLayoutSize(Container parent)` Determines the minimum size of the `parent` container using this form layout.
`Dimension`	`preferredLayoutSize(Container parent)` Determines the preferred size of the `parent` container using this form layout.
`void`	`removeColumn(int columnIndex)` Removes the column with the given column index from the layout.
`void`	`removeLayoutComponent(Component comp)` Removes the specified component from this layout.
`void`	`removeRow(int rowIndex)` Removes the row with the given row index from the layout.
`void`	`setColumnGroup(int... indices)` Sets a single column group, where each column gets the same width.
`void`	`setColumnGroups(int[][] groupOfIndices)` Sets the column groups, where each column in a group gets the same group wide width.
`void`	`setColumnSpec(int columnIndex, ColumnSpec columnSpec)` Sets the ColumnSpec at the specified column index.
`void`	`setConstraints(Component component, CellConstraints constraints)` Sets the constraints for the specified component in this layout.
`void`	`setHonorsVisibility(boolean b)` Specifies whether invisible components shall be taken into account by this layout for computing the layout size and setting component bounds.
`void`	`setHonorsVisibility(Component component, Boolean b)` Specifies whether the given component shall be taken into account for sizing and positioning.
`void`	`setRowGroup(int... indices)` Sets a single row group, where each row gets the same height.
`void`	`setRowGroups(int[][] groupOfIndices)` Sets the row groups, where each row in such a group gets the same group wide height.
`void`	`setRowSpec(int rowIndex, RowSpec rowSpec)` Sets the RowSpec at the specified row index.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FormLayout
```
public FormLayout()
```
    Constructs an empty FormLayout. Columns and rows must be added before components can be added to the layout container.
    This constructor is intended to be used in environments that add columns and rows dynamically.
  - FormLayout
```
public FormLayout(String encodedColumnSpecs)
```
    Constructs a FormLayout using the given encoded column specifications. The constructed layout has no rows; these must be added before components can be added to the layout container. The string decoding uses the default LayoutMap.
    This constructor is intended to be used with builder classes that add rows dynamically, such as the DefaultFormBuilder.
    Examples:
```
 // Label, gap, component
 FormLayout layout = new FormLayout(
      "pref, 4dlu, pref");

 // Right-aligned label, gap, component, gap, component
 FormLayout layout = new FormLayout(
      "right:pref, 4dlu, 50dlu, 4dlu, 50dlu");

 // Left-aligned labels, gap, components, gap, components
 FormLayout layout = new FormLayout(
      "left:pref, 4dlu, pref, 4dlu, pref");
 
```
    See the class comment for more examples.
    Parameters:
    encodedColumnSpecs - comma separated encoded column specifications
    
    Throws:
    
    NullPointerException - if encodedColumnSpecs is null
    See Also:
    LayoutMap.getRoot()
  - FormLayout
```
public FormLayout(String encodedColumnSpecs,
          LayoutMap layoutMap)
```
    Constructs a FormLayout using the given encoded column specifications and LayoutMap. The constructed layout has no rows; these must be added before components can be added to the layout container.
    This constructor is intended to be used with builder classes that add rows dynamically, such as the DefaultFormBuilder.
    Examples:
```
 // Label, gap, component
 FormLayout layout = new FormLayout(
      "pref, 4dlu, pref",
      myLayoutMap);

 // Right-aligned label, gap, component, gap, component
 FormLayout layout = new FormLayout(
      "right:pref, @lcgap, 50dlu, 4dlu, 50dlu",
      myLayoutMap);

 // Left-aligned labels, gap, components, gap, components
 FormLayout layout = new FormLayout(
      "left:pref, @lcgap, pref, @myGap, pref",
      myLayoutMap);
 
```
    See the class comment for more examples.
    Parameters:
    encodedColumnSpecs - comma separated encoded column specifications
    layoutMap - expands layout column and row variables
    
    Throws:
    
    NullPointerException - if encodedColumnSpecs or layoutMap is null
    Since:
    
    1.2
    
    See Also:
    LayoutMap.getRoot()
  - FormLayout
```
public FormLayout(String encodedColumnSpecs,
          String encodedRowSpecs)
```
    Constructs a FormLayout using the given encoded column and row specifications and the default LayoutMap.
    This constructor is recommended for most hand-coded layouts.
    Examples:
```
 FormLayout layout = new FormLayout(
      "pref, 4dlu, pref",               // columns
      "p, 3dlu, p");                    // rows

 FormLayout layout = new FormLayout(
      "right:pref, 4dlu, pref",         // columns
      "p, 3dlu, p, 3dlu, fill:p:grow"); // rows

 FormLayout layout = new FormLayout(
      "left:pref, 4dlu, 50dlu",         // columns
      "p, 2px, p, 3dlu, p, 9dlu, p");   // rows

 FormLayout layout = new FormLayout(
      "max(75dlu;pref), 4dlu, default", // columns
      "p, 3dlu, p, 3dlu, p, 3dlu, p");  // rows
 
```
    See the class comment for more examples.
    Parameters:
    encodedColumnSpecs - comma separated encoded column specifications
    encodedRowSpecs - comma separated encoded row specifications
    
    Throws:
    
    NullPointerException - if encodedColumnSpecs or encodedRowSpecs is null
    See Also:
    LayoutMap.getRoot()
  - FormLayout
```
public FormLayout(String encodedColumnSpecs,
          String encodedRowSpecs,
          LayoutMap layoutMap)
```
    Constructs a FormLayout using the given encoded column and row specifications and the given LayoutMap.
    Examples:
```
 FormLayout layout = new FormLayout(
      "pref, 4dlu, pref",               // columns
      "p, 3dlu, p",                     // rows
      myLayoutMap);                     // custom LayoutMap

 FormLayout layout = new FormLayout(
      "right:pref, 4dlu, pref",         // columns
      "p, @lgap, p, @lgap, fill:p:grow",// rows
      myLayoutMap);                     // custom LayoutMap

 FormLayout layout = new FormLayout(
      "left:pref, 4dlu, 50dlu",         // columns
      "p, 2px, p, 3dlu, p, 9dlu, p",    // rows
      myLayoutMap);                     // custom LayoutMap

 FormLayout layout = new FormLayout(
      "max(75dlu;pref), 4dlu, default", // columns
      "p, 3dlu, p, 3dlu, p, 3dlu, p",   // rows
      myLayoutMap);                     // custom LayoutMap
 
```
    See the class comment for more examples.
    Parameters:
    encodedColumnSpecs - comma separated encoded column specifications
    encodedRowSpecs - comma separated encoded row specifications
    layoutMap - expands layout column and row variables
    
    Throws:
    
    NullPointerException - if encodedColumnSpecs, encodedRowSpecs, or layoutMap is null
    Since:
    
    1.2
  - FormLayout
```
public FormLayout(ColumnSpec[] colSpecs)
```
    Constructs a FormLayout using the given column specifications. The constructed layout has no rows; these must be added before components can be added to the layout container.
    
    Parameters:
    colSpecs - an array of column specifications.
    
    Throws:
    
    NullPointerException - if colSpecs is null
    Since:
    
    1.1
  - FormLayout
```
public FormLayout(ColumnSpec[] colSpecs,
          RowSpec[] rowSpecs)
```
    Constructs a FormLayout using the given column and row specifications.
    
    Parameters:
    colSpecs - an array of column specifications.
    rowSpecs - an array of row specifications.
    
    Throws:
    
    NullPointerException - if colSpecs or rowSpecs is null
- Method Detail
  - getColumnCount
```
public int getColumnCount()
```
    Returns the number of columns in this layout.
    
    Returns:
    the number of columns
  - getColumnSpec
```
public ColumnSpec getColumnSpec(int columnIndex)
```
    Returns the ColumnSpec at the specified column index.
    
    Parameters:
    columnIndex - the column index of the requested ColumnSpec
    
    Returns:
    the ColumnSpec at the specified column
    
    Throws:
    
    IndexOutOfBoundsException - if the column index is out of range
  - setColumnSpec
```
public void setColumnSpec(int columnIndex,
                 ColumnSpec columnSpec)
```
    Sets the ColumnSpec at the specified column index.
    
    Parameters:
    columnIndex - the index of the column to be changed
    columnSpec - the ColumnSpec to be set
    
    Throws:
    
    NullPointerException - if columnSpec is null
    
    IndexOutOfBoundsException - if the column index is out of range
  - appendColumn
```
public void appendColumn(ColumnSpec columnSpec)
```
    Appends the given column specification to the right hand side of all columns.
    
    Parameters:
    columnSpec - the column specification to be added
    
    Throws:
    
    NullPointerException - if columnSpec is null
  - insertColumn
```
public void insertColumn(int columnIndex,
                ColumnSpec columnSpec)
```
    Inserts the specified column at the specified position. Shifts components that intersect the new column to the right hand side and readjusts column groups.
    The component shift works as follows: components that were located on the right hand side of the inserted column are shifted one column to the right; component column span is increased by one if it intersects the new column.
    Column group indices that are greater or equal than the given column index will be increased by one.
    
    Parameters:
    columnIndex - index of the column to be inserted
    columnSpec - specification of the column to be inserted
    
    Throws:
    
    IndexOutOfBoundsException - if the column index is out of range
  - removeColumn
```
public void removeColumn(int columnIndex)
```
    Removes the column with the given column index from the layout. Components will be rearranged and column groups will be readjusted. Therefore, the column must not contain components and must not be part of a column group.
    The component shift works as follows: components that were located on the right hand side of the removed column are moved one column to the left; component column span is decreased by one if it intersects the removed column.
    Column group indices that are greater than the column index will be decreased by one.
    Note: If one of the constraints mentioned above is violated, this layout's state becomes illegal and it is unsafe to work with this layout. A typical layout implementation can ensure that these constraints are not violated. However, in some cases you may need to check these conditions before you invoke this method. The Forms extras contain source code for class FormLayoutUtils that provides the required test methods:
    #columnContainsComponents(Container, int) and
    #isGroupedColumn(FormLayout, int).
    
    Parameters:
    columnIndex - index of the column to remove
    
    Throws:
    
    IndexOutOfBoundsException - if the column index is out of range
    
    IllegalStateException - if the column contains components or if the column is already grouped
    See Also:
    FormLayoutUtils.columnContainsComponent(Container, int), FormLayoutUtils.isGroupedColumn(FormLayout, int)
  - getRowCount
```
public int getRowCount()
```
    Returns the number of rows in this layout.
    
    Returns:
    the number of rows
  - getRowSpec
```
public RowSpec getRowSpec(int rowIndex)
```
    Returns the RowSpec at the specified row index.
    
    Parameters:
    rowIndex - the row index of the requested RowSpec
    
    Returns:
    the RowSpec at the specified row
    
    Throws:
    
    IndexOutOfBoundsException - if the row index is out of range
  - setRowSpec
```
public void setRowSpec(int rowIndex,
              RowSpec rowSpec)
```
    Sets the RowSpec at the specified row index.
    
    Parameters:
    rowIndex - the index of the row to be changed
    rowSpec - the RowSpec to be set
    
    Throws:
    
    NullPointerException - if rowSpec is null
    
    IndexOutOfBoundsException - if the row index is out of range
  - appendRow
```
public void appendRow(RowSpec rowSpec)
```
    Appends the given row specification to the bottom of all rows.
    
    Parameters:
    rowSpec - the row specification to be added to the form layout
    
    Throws:
    
    NullPointerException - if rowSpec is null
  - insertRow
```
public void insertRow(int rowIndex,
             RowSpec rowSpec)
```
    Inserts the specified column at the specified position. Shifts components that intersect the new column to the right and readjusts column groups.
    The component shift works as follows: components that were located on the right hand side of the inserted column are shifted one column to the right; component column span is increased by one if it intersects the new column.
    Column group indices that are greater or equal than the given column index will be increased by one.
    
    Parameters:
    rowIndex - index of the row to be inserted
    rowSpec - specification of the row to be inserted
    
    Throws:
    
    IndexOutOfBoundsException - if the row index is out of range
  - removeRow
```
public void removeRow(int rowIndex)
```
    Removes the row with the given row index from the layout. Components will be rearranged and row groups will be readjusted. Therefore, the row must not contain components and must not be part of a row group.
    The component shift works as follows: components that were located below the removed row are moved up one row; component row span is decreased by one if it intersects the removed row.
    Row group indices that are greater than the row index will be decreased by one.
    Note: If one of the constraints mentioned above is violated, this layout's state becomes illegal and it is unsafe to work with this layout. A typical layout implementation can ensure that these constraints are not violated. However, in some cases you may need to check these conditions before you invoke this method. The Forms extras contain source code for class FormLayoutUtils that provides the required test methods:
    #rowContainsComponents(Container, int) and
    #isGroupedRow(FormLayout, int).
    
    Parameters:
    rowIndex - index of the row to remove
    
    Throws:
    
    IndexOutOfBoundsException - if the row index is out of range
    
    IllegalStateException - if the row contains components or if the row is already grouped
    See Also:
    FormLayoutUtils.rowContainsComponent(Container, int), FormLayoutUtils.isGroupedRow(FormLayout, int)
  - getConstraints
```
public CellConstraints getConstraints(Component component)
```
    Looks up and returns the constraints for the specified component. A copy of the actualCellConstraints object is returned.
    
    Parameters:
    component - the component to be queried
    
    Returns:
    the CellConstraints for the specified component
    
    Throws:
    
    NullPointerException - if component is null
    
    IllegalStateException - if component has not been added to the container
  - setConstraints
```
public void setConstraints(Component component,
                  CellConstraints constraints)
```
    Sets the constraints for the specified component in this layout.
    
    Parameters:
    component - the component to be modified
    constraints - the constraints to be applied
    
    Throws:
    
    NullPointerException - if component or constraints is null
  - getColumnGroups
```
public int[][] getColumnGroups()
```
    Returns a deep copy of the column groups.
    
    Returns:
    the column groups as two-dimensional int array
  - setColumnGroups
```
public void setColumnGroups(int[][] groupOfIndices)
```
    Sets the column groups, where each column in a group gets the same group wide width. Each group is described by an array of integers that are interpreted as column indices. The parameter is an array of such group descriptions.
    Examples:
```
 // Group columns 1, 3 and 4.
 setColumnGroups(new int[][]{ {1, 3, 4}});

 // Group columns 1, 3, 4, and group columns 7 and 9
 setColumnGroups(new int[][]{ {1, 3, 4}, {7, 9}});
 
```
    Parameters:
    groupOfIndices - a two-dimensional array of column groups indices
    
    Throws:
    
    IndexOutOfBoundsException - if an index is outside the grid
    
    IllegalArgumentException - if a column index is used twice, or of a group of indices contains only a single element
  - setColumnGroup
```
public void setColumnGroup(int... indices)
```
    Sets a single column group, where each column gets the same width.
    Example:
```
 // Group columns 1, 3 and 4.
 setColumnGroup(1, 3, 4);
 
```
    Parameters:
    indices - the indices for a single column group
    
    Throws:
    
    IndexOutOfBoundsException - if an index is outside the grid
    
    IllegalArgumentException - if a column index is used twice or if there is only a single index
    
    NullPointerException - if indices is null
    Since:
    
    1.8
    
    See Also:
    setColumnGroups(int[][])
  - addGroupedColumn
```
public void addGroupedColumn(int columnIndex)
```
    Adds the specified column index to the last column group. In case there are no groups, a new group will be created.
    
    Parameters:
    columnIndex - the column index to be set grouped
  - getRowGroups
```
public int[][] getRowGroups()
```
    Returns a deep copy of the row groups.
    
    Returns:
    the row groups as two-dimensional int array
  - setRowGroups
```
public void setRowGroups(int[][] groupOfIndices)
```
    Sets the row groups, where each row in such a group gets the same group wide height. Each group is described by an array of integers that are interpreted as row indices. The parameter is an array of such group descriptions.
    Examples:
```
 // Group rows 1 and 2.
 setRowGroups(new int[][]{ {1, 2}});

 // Group rows 1 and 2, and group rows 5, 7, and 9.
 setRowGroups(new int[][]{ {1, 2}, {5, 7, 9}});
 
```
    Parameters:
    groupOfIndices - a two-dimensional array of row group indices
    
    Throws:
    
    IndexOutOfBoundsException - if an index is outside the grid
    
    IllegalArgumentException - if a column index is used twice, or of a group of indices contains only a single element
  - setRowGroup
```
public void setRowGroup(int... indices)
```
    Sets a single row group, where each row gets the same height.
    Example:
```
 // Group rows 1 and 2.
 setRowGroup(1, 2);
 
```
    Parameters:
    indices - the indices for a single row group
    
    Throws:
    
    IndexOutOfBoundsException - if an index is outside the grid
    
    IllegalArgumentException - if a row index is used twice or if there is only a single index
    
    NullPointerException - if indices is null
    Since:
    
    1.8
    
    See Also:
    setRowGroups(int[][])
  - addGroupedRow
```
public void addGroupedRow(int rowIndex)
```
    Adds the specified row index to the last row group. In case there are no groups, a new group will be created.
    
    Parameters:
    rowIndex - the index of the row that should be grouped
  - getHonorsVisibility
```
public boolean getHonorsVisibility()
```
    Returns whether invisible components shall be taken into account by this layout. This container-wide setting can be overridden per component. See setHonorsVisibility(boolean) for details.
    
    Returns:
    true if the component visibility is honored by this FormLayout, false if it is ignored. This setting can be overridden for individual CellConstraints using setHonorsVisibility(Component, Boolean).
    Since:
    
    1.2
  - setHonorsVisibility
```
public void setHonorsVisibility(boolean b)
```
    Specifies whether invisible components shall be taken into account by this layout for computing the layout size and setting component bounds. If set to true invisible components will be ignored by the layout. If set to false components will be taken into account regardless of their visibility. Visible components are always used for sizing and positioning.
    The default value for this setting is true. It is useful to set the value to false (in other words to ignore the visibility) if you switch the component visibility dynamically and want the container to retain the size and component positions.
    This container-wide default setting can be overridden per component using setHonorsVisibility(Component, Boolean).
    Components are taken into account, if
    1. they are visible, or
    2. they have no individual setting and the container-wide settings ignores the visibility (honorsVisibility set to false), or
    3. the individual component ignores the visibility.
    Parameters:
    b - true to honor the visibility, i.e. to exclude invisible components from the sizing and positioning, false to ignore the visibility, in other words to layout visible and invisible components
    Since:
    
    1.2
  - setHonorsVisibility
```
public void setHonorsVisibility(Component component,
                       Boolean b)
```
    Specifies whether the given component shall be taken into account for sizing and positioning. This setting overrides the container-wide default. See setHonorsVisibility(boolean) for details.
    
    Parameters:
    component - the component that shall get an individual setting
    b - Boolean.TRUE to override the container default and honor the visibility for the given component, Boolean.FALSE to override the container default and ignore the visibility for the given component, null to use the container default value as specified by getHonorsVisibility().
    Since:
    
    1.2
  - addLayoutComponent
```
public void addLayoutComponent(String name,
                      Component component)
```
    Throws an UnsupportedOperationException. Does not add the specified component with the specified name to the layout.
    
    Specified by:
    
    addLayoutComponent in interface LayoutManager
    
    Parameters:
    name - indicates entry's position and anchor
    component - component to add
    
    Throws:
    
    UnsupportedOperationException - always
  - addLayoutComponent
```
public void addLayoutComponent(Component comp,
                      Object constraints)
```
    Adds the specified component to the layout, using the specified constraints object. Note that constraints are mutable and are, therefore, cloned when cached.
    
    Specified by:
    
    addLayoutComponent in interface LayoutManager2
    
    Parameters:
    comp - the component to be added
    constraints - the component's cell constraints
    
    Throws:
    
    NullPointerException - if constraints is null
    
    IllegalArgumentException - if constraints is neither a String, nor a CellConstraints object, or a String that is rejected by the CellConstraints construction
  - removeLayoutComponent
```
public void removeLayoutComponent(Component comp)
```
    Removes the specified component from this layout.
    Most applications do not call this method directly.
    
    Specified by:
    
    removeLayoutComponent in interface LayoutManager
    
    Parameters:
    comp - the component to be removed.
    See Also:
    Container.remove(java.awt.Component), Container.removeAll()
  - minimumLayoutSize
```
public Dimension minimumLayoutSize(Container parent)
```
    Determines the minimum size of the parent container using this form layout.
    Most applications do not call this method directly.
    
    Specified by:
    
    minimumLayoutSize in interface LayoutManager
    
    Parameters:
    parent - the container in which to do the layout
    
    Returns:
    the minimum size of the parent container
    See Also:
    Container.doLayout()
  - preferredLayoutSize
```
public Dimension preferredLayoutSize(Container parent)
```
    Determines the preferred size of the parent container using this form layout.
    Most applications do not call this method directly.
    
    Specified by:
    
    preferredLayoutSize in interface LayoutManager
    
    Parameters:
    parent - the container in which to do the layout
    
    Returns:
    the preferred size of the parent container
    See Also:
    Container.getPreferredSize()
  - maximumLayoutSize
```
public Dimension maximumLayoutSize(Container target)
```
    Returns the maximum dimensions for this layout given the components in the specified target container.
    
    Specified by:
    
    maximumLayoutSize in interface LayoutManager2
    
    Parameters:
    target - the container which needs to be laid out
    
    Returns:
    the maximum dimensions for this layout
    See Also:
    Container, minimumLayoutSize(Container), preferredLayoutSize(Container)
  - getLayoutAlignmentX
```
public float getLayoutAlignmentX(Container parent)
```
    Returns the alignment along the x axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the farthest away from the origin, 0.5 is centered, etc.
    
    Specified by:
    
    getLayoutAlignmentX in interface LayoutManager2
    
    Parameters:
    parent - the parent container
    
    Returns:
    the value 0.5f to indicate center alignment
  - getLayoutAlignmentY
```
public float getLayoutAlignmentY(Container parent)
```
    Returns the alignment along the y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the farthest away from the origin, 0.5 is centered, etc.
    
    Specified by:
    
    getLayoutAlignmentY in interface LayoutManager2
    
    Parameters:
    parent - the parent container
    
    Returns:
    the value 0.5f to indicate center alignment
  - invalidateLayout
```
public void invalidateLayout(Container target)
```
    Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
    
    Specified by:
    
    invalidateLayout in interface LayoutManager2
    
    Parameters:
    target - the container that holds the layout to be invalidated
  - layoutContainer
```
public void layoutContainer(Container parent)
```
    Lays out the specified container using this form layout. This method reshapes components in the specified container in order to satisfy the constraints of this FormLayout object.
    Most applications do not call this method directly.
    The form layout performs the following steps:
    1. find components that occupy exactly one column or row
    2. compute minimum widths and heights
    3. compute preferred widths and heights
    4. give cols and row equal size if they share a group
    5. compress default columns and rows if total is less than pref size
    6. give cols and row equal size if they share a group
    7. distribute free space
    8. set components bounds
    Specified by:
    
    layoutContainer in interface LayoutManager
    
    Parameters:
    parent - the container in which to do the layout
    See Also:
    Container, Container.doLayout()
  - getLayoutInfo
```
public FormLayout.LayoutInfo getLayoutInfo(Container parent)
```
    Computes and returns the horizontal and vertical grid origins. Performs the same layout process as #layoutContainer but does not layout the components.
    This method has been added only to make it easier to debug the form layout. You must not call this method directly; It may be removed in a future release or the visibility may be reduced.
    
    Parameters:
    parent - the Container to inspect
    
    Returns:
    an object that comprises the grid x and y origins

Class FormLayout

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FormLayout

FormLayout

FormLayout

FormLayout

FormLayout

FormLayout

FormLayout

Method Detail

getColumnCount

getColumnSpec

setColumnSpec

appendColumn

insertColumn

removeColumn

getRowCount

getRowSpec

setRowSpec

appendRow

insertRow

removeRow

getConstraints

setConstraints

getColumnGroups

setColumnGroups

setColumnGroup

addGroupedColumn

getRowGroups

setRowGroups

setRowGroup

addGroupedRow

getHonorsVisibility

setHonorsVisibility

setHonorsVisibility

addLayoutComponent

addLayoutComponent

removeLayoutComponent

minimumLayoutSize

preferredLayoutSize

maximumLayoutSize

getLayoutAlignmentX

getLayoutAlignmentY

invalidateLayout

layoutContainer

getLayoutInfo