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java.lang.Objectyu.ac.bg.etf.javaqx.qswing.layouts.formlayout.FormLayout
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
yu.ac.bg.etf.javaqx.qswing.layouts.formlayout.ButtonBarBuilder
assists you in building button bars; it creates a standardized FormLayout and
provides a minimal API that specializes in adding buttons. 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 CellConstraints cc = new CellConstraints(); 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
yu.ac.bg.etf.javaqx.qswing.layouts.formlayout.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); CellConstraints cc = new CellConstraints(); 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
yu.ac.bg.etf.javaqx.qswing.layouts.formlayout.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();
Nested Class Summary | |
static class |
FormLayout.LayoutInfo
Stores column and row origins. |
static interface |
FormLayout.Measure
An interface that describes how to measure a Component . |
Constructor Summary | |
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(java.lang.String encodedColumnSpecs)
Constructs a FormLayout using the given encoded column specifications. |
|
FormLayout(java.lang.String encodedColumnSpecs,
java.lang.String encodedRowSpecs)
Constructs a FormLayout using the given encoded column and row specifications. |
Method Summary | |
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(JQComponent comp,
java.lang.Object constraints)
Adds the specified component to the layout, using the specified constraints object. |
void |
addLayoutComponent(java.lang.String name,
JQComponent 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(JQComponent component)
Looks up and returns the constraints for the specified component. |
float |
getLayoutAlignmentX(JQContainer parent)
Returns the alignment along the x axis. |
float |
getLayoutAlignmentY(JQContainer parent)
Returns the alignment along the y axis. |
FormLayout.LayoutInfo |
getLayoutInfo(JQContainer 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(JQContainer target)
Invalidates the layout, indicating that if the layout manager has cached information it should be discarded. |
void |
layoutContainer(JQContainer parent)
Lays out the specified container using this form layout. |
Dimension |
maximumLayoutSize(JQContainer target)
Returns the maximum dimensions for this layout given the components in the specified target container. |
Dimension |
minimumLayoutSize(JQContainer parent)
Determines the minimum size of the parent container using this
form layout. |
Dimension |
preferredLayoutSize(JQContainer 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(JQComponent comp)
Removes the specified component from this layout. |
void |
removeRow(int rowIndex)
Removes the row with the given row index from the layout. |
void |
setColumnGroups(int[][] colGroupIndices)
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(JQComponent component,
CellConstraints constraints)
Sets the constraints for the specified component in this layout. |
void |
setRowGroups(int[][] rowGroupIndices)
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 |
public FormLayout()
This constructor is intended to be used in environments that add columns and rows dynamically.
public FormLayout(java.lang.String encodedColumnSpecs)
This constructor is primarily 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.
encodedColumnSpecs
- comma separated encoded column specifications
java.lang.NullPointerException
- if encodedColumnSpecs is null
public FormLayout(java.lang.String encodedColumnSpecs, java.lang.String encodedRowSpecs)
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"); // rowsSee the class comment for more examples.
encodedColumnSpecs
- comma separated encoded column specificationsencodedRowSpecs
- comma separated encoded row specifications
java.lang.NullPointerException
- if encodedColumnSpecs or encodedRowSpecs
is null
public FormLayout(ColumnSpec[] colSpecs)
colSpecs
- an array of column specifications.
java.lang.NullPointerException
- if colSpecs is nullpublic FormLayout(ColumnSpec[] colSpecs, RowSpec[] rowSpecs)
colSpecs
- an array of column specifications.rowSpecs
- an array of row specifications.
java.lang.IllegalArgumentException
- if colSpecs or rowSpecs is nullMethod Detail |
public int getColumnCount()
public int getRowCount()
public ColumnSpec getColumnSpec(int columnIndex)
ColumnSpec
at the specified column index.
columnIndex
- the column index of the requested ColumnSpec
java.lang.IndexOutOfBoundsException
- if the column index is out of rangepublic void setColumnSpec(int columnIndex, ColumnSpec columnSpec)
ColumnSpec
at the specified column index.
columnIndex
- the index of the column to be changedcolumnSpec
- the ColumnSpec
to be set
java.lang.IllegalArgumentException
- if the column specification is
null
java.lang.IndexOutOfBoundsException
- if the column index is out of rangepublic RowSpec getRowSpec(int rowIndex)
RowSpec
at the specified row index.
rowIndex
- the row index of the requested RowSpec
RowSpec
at the specified row
java.lang.IndexOutOfBoundsException
- if the row index is out of rangepublic void setRowSpec(int rowIndex, RowSpec rowSpec)
RowSpec
at the specified row index.
rowIndex
- the index of the row to be changedrowSpec
- the RowSpec
to be set
java.lang.IllegalArgumentException
- if the row specification is null
java.lang.IndexOutOfBoundsException
- if the row index is out of rangepublic void appendColumn(ColumnSpec columnSpec)
columnSpec
- the column specification to be added
java.lang.IllegalArgumentException
- if the column specification is
nullpublic void insertColumn(int columnIndex, ColumnSpec columnSpec)
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.
columnIndex
- index of the column to be insertedcolumnSpec
- specification of the column to be inserted
java.lang.IndexOutOfBoundsException
- if the column index is out of rangepublic void removeColumn(int columnIndex)
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)
.
columnIndex
- index of the column to remove
java.lang.IndexOutOfBoundsException
- if the column index is out of range
java.lang.IllegalStateException
- if the column contains components
or if the column is already groupedpublic void appendRow(RowSpec rowSpec)
rowSpec
- the row specification to be added to the form layout
java.lang.IllegalArgumentException
- if the rowSpec is nullpublic void insertRow(int rowIndex, RowSpec rowSpec)
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.
rowIndex
- index of the row to be insertedrowSpec
- specification of the row to be inserted
java.lang.IndexOutOfBoundsException
- if the row index is out of rangepublic void removeRow(int rowIndex)
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)
.
rowIndex
- index of the row to remove
java.lang.IndexOutOfBoundsException
- if the row index is out of range
java.lang.IllegalStateException
- if the row contains components or if the row
is already groupedpublic CellConstraints getConstraints(JQComponent component)
CellConstraints
object is returned.
component
- the component to be queried
CellConstraints
for the specified component
java.lang.IllegalArgumentException
- if component is null or
has not been added to the containerpublic void setConstraints(JQComponent component, CellConstraints constraints)
component
- the component to be modifiedconstraints
- the constraints to be applied
java.lang.IllegalArgumentException
- if the component or constraints object is
nullpublic int[][] getColumnGroups()
public void setColumnGroups(int[][] colGroupIndices)
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}});
colGroupIndices
- a two-dimensional array of column groups indices
java.lang.IndexOutOfBoundsException
- if an index is outside the grid
java.lang.IllegalArgumentException
- if a column index is used twicepublic void addGroupedColumn(int columnIndex)
columnIndex
- the column index to be set groupedpublic int[][] getRowGroups()
public void setRowGroups(int[][] rowGroupIndices)
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}});
rowGroupIndices
- a two-dimensional array of row group indices.
java.lang.IndexOutOfBoundsException
- if an index is outside the gridpublic void addGroupedRow(int rowIndex)
rowIndex
- the index of the row that should be groupedpublic void addLayoutComponent(java.lang.String name, JQComponent component)
UnsupportedOperationException
. Does not add the
specified component with the specified name to the layout.
name
- indicates entry's position and anchorcomponent
- component to add
java.lang.UnsupportedOperationException
- alwayspublic void addLayoutComponent(JQComponent comp, java.lang.Object constraints)
constraints
object. Note that constraints are mutable and
are, therefore, cloned when cached.
addLayoutComponent
in interface LayoutManager
comp
- the component to be addedconstraints
- the component's cell constraints
java.lang.IllegalArgumentException
- if constraints is null
java.lang.IllegalArgumentException
- if constraints is null
and if constraints is not a
CellConstraints or a String that
cannot be used to construct a
CellConstraintspublic float getLayoutAlignmentX(JQContainer parent)
parent
- the parent container
public float getLayoutAlignmentY(JQContainer parent)
parent
- the parent container
public void invalidateLayout(JQContainer target)
invalidateLayout
in interface LayoutManager
target
- the container that holds the layout to be invalidatedpublic FormLayout.LayoutInfo getLayoutInfo(JQContainer parent)
#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.
parent
- the Container
to inspect
public void removeLayoutComponent(JQComponent comp)
Most applications do not call this method directly.
removeLayoutComponent
in interface LayoutManager
comp
- the component to be removed.public Dimension minimumLayoutSize(JQContainer parent)
parent
container using this
form layout.Most applications do not call this method directly.
minimumLayoutSize
in interface LayoutManager
parent
- the container in which to do the layout
parent
containerpublic Dimension preferredLayoutSize(JQContainer parent)
Most applications do not call this method directly.
preferredLayoutSize
in interface LayoutManager
parent
- the container in which to do the layout
public Dimension maximumLayoutSize(JQContainer target)
maximumLayoutSize
in interface LayoutManager
target
- the container which needs to be laid out
public void layoutContainer(JQContainer parent)
FormLayout
object.Most applications do not call this method directly.
The form layout performs the following steps:
layoutContainer
in interface LayoutManager
parent
- the container in which to do the layout
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