net.sourceforge.networktools.proportionlayout
Class ProportionLayout

java.lang.Object
  net.sourceforge.networktools.proportionlayout.ProportionLayout

All Implemented Interfaces:

java.awt.LayoutManager, java.awt.LayoutManager2, java.io.Serializable

public class ProportionLayout
extends java.lang.Object
implements java.awt.LayoutManager2, java.io.Serializable

The ProportionLayout class is a flexible layout manager that aligns components vertically and horizontally, without requiring that the components be of the same size.

The ProportionLayout class defines a grid wherein components can be laid out. Each component managed by a ProportionLayout is associated with an instance of ProportionConstraints. The ProportionConstraints object specifies where a component's display area should be located on the grid and how the component should be positioned within its display area. In addition to its constraints object, the ProportionLayout also considers each component's minimum and preferred sizes in order to determine a component's size.

The following figures show six components (all buttons) managed by a proportion layout. Figure 1 shows the layout for the components with their preferred size and Figure 2 shows the layout for the same components resized to a larger size.

Figure 1: the example with its preferred size

Figure 2: the example resized to a larger size

In this example there are 3 columns and 3 rows. The proportion of column 1 is set to NO_PROPORTION and the proportion of columns 2 and 3 are set to 1.0 The proportion of row 1 and 3 are set to NO_PROPORTION and the proportion of row 2 is set to 1.0 The rows and columns with proportion set to NO_PROPORTION means that they have a fixed size that will always stay the same, even after resizing. Those with proportion set to 1.0 get all the extra size to divide among them when the layout is resized to a larger size.

Here is the code that implements the example shown above:

 import java.awt.*;
 import javax.swing.*;
 

 import net.sourceforge.networktools.proportionlayout.*;
 

 public class LayoutTester extends JFrame {
 

   public static void main(String[] args) {
      LayoutTester currentFrame = new LayoutTester();
      currentFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      currentFrame.pack();
      currentFrame.show();
   }
 

   public LayoutTester() {
      super("LayoutTester");
      Container contentPanel = getContentPane();
      ProportionLayout layout = new ProportionLayout();
 

      // First add all the columns to the ProportionLayout
      layout.appendColumn(10);                                // column 0
      // Column 0 will be an empty space of width 10
      layout.appendColumn(0, ProportionLayout.NO_PROPORTION); // column 1
      // Column 1 will always be the greatest preferred width of all it's components
      // Column 1 will never get any of the additional width
      layout.appendColumn(10);                                // column 2
      // Column 2 will be an empty space of width 10
      layout.appendColumn(0, 1.0);                            // column 3
      // Column 3 will always be the same width as column 5
      // Column 3 and 5 will devide any of the additional width between them
      layout.appendColumn(10);                                // column 4
      // Column 4 will be an empty space of width 10
      layout.appendColumn(0, 1.0);                            // column 5
      // Column 5 will always be the same width as column 3
      // Column 3 and 5 will devide any of the additional width between them
      layout.appendColumn(10);                                // column 6
      // Column 6 will be an empty space of width 10
 

      // Then add all the rows to the ProportionLayout
      layout.appendRow(10);                                // row 0
      // Row 0 will be an empty space of width 10
      layout.appendRow(0, ProportionLayout.NO_PROPORTION); // row 1
      // Row 1 will always be the greatest preferred height of all it's components
      // Row 1 will never get any of the additional height
      layout.appendRow(10);                                // row 2
      // Row 2 will be an empty space of width 10
      layout.appendRow(0, ProportionLayout.NO_PROPORTION); // row 3
      // Row 3 will always be the greatest preferred height of all it's components
      // Row 3 will never get any of the additional height
      layout.appendRow(10);                                // row 4
      // Row 4 will be an empty space of width 10
      layout.appendRow(0, 1.0);                            // row 5
      // Row 5 will get all of the additional height
      layout.appendRow(10);                                // row 6
      // Row 6 will be an empty space of width 10
 

      contentPanel.setLayout(layout);
      contentPanel.add(new JButton("B1"),
                       new ProportionConstraints(1, 1) );
                       // column 1, row 1
      contentPanel.add(new JButton("Button 2 takes up a lot of space"),
                       new ProportionConstraints(3, 1) );
                       // column 3, row 1
      contentPanel.add(new JButton("Button 3"),
                       new ProportionConstraints(5, 1) );
                       // column 5, row 1
      contentPanel.add(new JButton("B4"),
                       new ProportionConstraints(1, 3, 3, 1) );
                       // column 1, row 3 with width 3, height 1
      contentPanel.add(new JButton("Button 5"),
                       new ProportionConstraints(1, 5) );
                       // column 1, row 5
      contentPanel.add(new JButton("B6"),
                       new ProportionConstraints(5, 3, 1, 3) );
                       // column 5, row 3 with width 1, height 3
 

      // ProportionConstaints has additional constructors with more parameters
      // that allow a more flexible control of how the component will behave
      // inside it's own cell.
   }
 

 }
 

Author:

Geoffrey and Jeroen

See Also:

Serialized Form

Field Summary

protected java.util.TreeSet	columnLineParts Contains all the columnLineParts
protected java.util.ArrayList	columnLines Contains all the columnLines for this ProportionLayout.
protected double	columnProportionTotal Contains the total amount of columnLines for this ProportionLayout.
protected java.util.HashMap	linePartCouples Contains which rowLine and columnLine belong together.
static double	NO_PROPORTION Make the column or row have it's preferred width or height, without stretching.
protected java.util.TreeSet	rowLineParts Contains all the rowLineParts
protected java.util.ArrayList	rowLines Contains all the rowLines for this ProportionLayout.
protected double	rowProportionTotal Contains the total amount of rowLines for this ProportionLayout.

Constructor Summary

ProportionLayout()
Creates a new instance of ProportionLayout

Method Summary

void	addLayoutComponent(java.awt.Component component, java.lang.Object object) Adds a component to the layout, using the specified ProportionConstraints of that object.
void	addLayoutComponent(java.lang.String name, java.awt.Component component) This method isn't supported.
int	appendColumn() Creates a new column at the end of the grid for this ProportionLayout.
int	appendColumn(int minimumWidth) Creates a new column at the end of the grid for this ProportionLayout.
int	appendColumn(int minimumWidth, double lineProportion) Creates a new column at the end of the grid for this ProportionLayout.
int	appendRow() Creates a new row at the end of the grid for this ProportionLayout.
int	appendRow(int minimumHeight) Creates a new row at the end of the grid for this ProportionLayout.
int	appendRow(int minimumHeight, double lineProportion) Creates a new row at the end of the grid for this ProportionLayout.
protected java.awt.Dimension	arrangeGrid(java.awt.Container parent, int sizeType) Arranges the grid for the given container of components and specifies the sizeType of it.
float	getLayoutAlignmentX(java.awt.Container parent) Returns the alignment along the x axis.
float	getLayoutAlignmentY(java.awt.Container parent) Returns the alignment along the y axis.
void	invalidateLayout(java.awt.Container parent) Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
void	layoutContainer(java.awt.Container parent) Lays out the specified container using this proportion layout.
java.awt.Dimension	maximumLayoutSize(java.awt.Container parent) Returns the maximum dimensions for this layout given the components in the specified target container.
java.awt.Dimension	minimumLayoutSize(java.awt.Container parent) Determines the minimum size of the target container using this proportion layout.
java.awt.Dimension	preferredLayoutSize(java.awt.Container parent) Determines the preferred size of the target container using this proportion layout.
void	removeLayoutComponent(java.awt.Component component) Removes a component from the ProportionLayout.
java.lang.String	toString() Returns a string representation of this proportion layout's values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

NO_PROPORTION

public static final double NO_PROPORTION

Make the column or row have it's preferred width or height, without stretching.

See Also:

Constant Field Values

columnLines

protected java.util.ArrayList columnLines

Contains all the columnLines for this ProportionLayout.

rowLines

protected java.util.ArrayList rowLines

Contains all the rowLines for this ProportionLayout.

columnProportionTotal

protected double columnProportionTotal

Contains the total amount of columnLines for this ProportionLayout.

rowProportionTotal

protected double rowProportionTotal

Contains the total amount of rowLines for this ProportionLayout.

linePartCouples

protected java.util.HashMap linePartCouples

Contains which rowLine and columnLine belong together.

columnLineParts

protected java.util.TreeSet columnLineParts

Contains all the columnLineParts

rowLineParts

protected java.util.TreeSet rowLineParts

Contains all the rowLineParts

Constructor Detail

ProportionLayout

public ProportionLayout()

Creates a new instance of ProportionLayout

Method Detail

appendColumn

public int appendColumn()
                 throws java.lang.IllegalArgumentException

Creates a new column at the end of the grid for this ProportionLayout. The minimunWidth is 0 and the lineProportion is NO_PROPORTION.

Returns:

the gridX value for the new column.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

appendColumn

public int appendColumn(int minimumWidth)
                 throws java.lang.IllegalArgumentException

Creates a new column at the end of the grid for this ProportionLayout. The lineProportion is NO_PROPORTION.

Parameters:

minimumWidth - Spicifies the minimum width for this column.

Returns:

the gridX value for the new column.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

appendColumn

public int appendColumn(int minimumWidth,
                        double lineProportion)
                 throws java.lang.IllegalArgumentException

Creates a new column at the end of the grid for this ProportionLayout.

Parameters:

minimumWidth - specifies the minimum width for this column.

lineProportion - specifies the proportion for this column.

Returns:

the gridX value for the new column.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

appendRow

public int appendRow()
              throws java.lang.IllegalArgumentException

Creates a new row at the end of the grid for this ProportionLayout. The minimunHeight is 0 and the lineProportion is NO_PROPORTION.

Returns:

the gridY value for the new row.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

appendRow

public int appendRow(int minimumHeight)
              throws java.lang.IllegalArgumentException

Creates a new row at the end of the grid for this ProportionLayout. The lineProportion is NO_PROPORTION.

Parameters:

minimumHeight - specifies the minimum height for this row.

Returns:

the gridY value for the new row.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

appendRow

public int appendRow(int minimumHeight,
                     double lineProportion)
              throws java.lang.IllegalArgumentException

Creates a new row at the end of the grid for this ProportionLayout.

Parameters:

minimumHeight - specifies the minimum height for this row.

lineProportion - specifies the proportion for this row.

Returns:

the gridY value for the new row.

Throws:

java.lang.IllegalArgumentException - if one of the arguments is an illegal argument.

arrangeGrid

protected java.awt.Dimension arrangeGrid(java.awt.Container parent,
                                         int sizeType)

Arranges the grid for the given container of components and specifies the sizeType of it.

Parameters:

parent - specified the container to be laid out.

sizeType - specifies the sizeType for this container.

Returns:

the arranged grid for this specific container of components.

addLayoutComponent

public void addLayoutComponent(java.awt.Component component,
                               java.lang.Object object)
                        throws java.lang.IllegalArgumentException,
                               java.lang.IndexOutOfBoundsException

Adds a component to the layout, using the specified ProportionConstraints of that object.

Specified by:

addLayoutComponent in interface java.awt.LayoutManager2

Parameters:

component - specifies the component to lay out.

object - specifies the cell in which the component is to be laid out.

Throws:

java.lang.IllegalArgumentException - if the object used as parameter is not of the ProportionConstraints type.

java.lang.IndexOutOfBoundsException - if the index of the object in which you are putting the component doesn't exist.

addLayoutComponent

public void addLayoutComponent(java.lang.String name,
                               java.awt.Component component)

This method isn't supported.

Specified by:

addLayoutComponent in interface java.awt.LayoutManager

Parameters:

name - the name of the component.

component - the component to be added.

removeLayoutComponent

public void removeLayoutComponent(java.awt.Component component)

Removes a component from the ProportionLayout.

Specified by:

removeLayoutComponent in interface java.awt.LayoutManager

Parameters:

component - specifies which component has to be removed.

minimumLayoutSize

public java.awt.Dimension minimumLayoutSize(java.awt.Container parent)

Determines the minimum size of the target container using this proportion layout.

Specified by:

minimumLayoutSize in interface java.awt.LayoutManager

Parameters:

parent - the component to be laid out

Returns:

the laid out component.

preferredLayoutSize

public java.awt.Dimension preferredLayoutSize(java.awt.Container parent)

Determines the preferred size of the target container using this proportion layout.

Specified by:

preferredLayoutSize in interface java.awt.LayoutManager

Parameters:

parent - the container to be laid out.

Returns:

the laid out container

maximumLayoutSize

public java.awt.Dimension maximumLayoutSize(java.awt.Container parent)

Returns the maximum dimensions for this layout given the components in the specified target container.

Specified by:

maximumLayoutSize in interface java.awt.LayoutManager2

Parameters:

parent - the component which needs to be laid out.

Returns:

the laid out component.

getLayoutAlignmentX

public float getLayoutAlignmentX(java.awt.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 furthest away from the origin, 0.5 is centered, etc.

Specified by:

getLayoutAlignmentX in interface java.awt.LayoutManager2

Parameters:

parent - the component/container which needs to be aligned along the x axis.

Returns:

the component/container aligned along the x axis.

getLayoutAlignmentY

public float getLayoutAlignmentY(java.awt.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 furthest away from the origin, 0.5 is centered, etc.

Specified by:

getLayoutAlignmentY in interface java.awt.LayoutManager2

Parameters:

parent - the component/container which needs to be aligned along the y axis.

Returns:

the component/container aligned along the y axis.

invalidateLayout

public void invalidateLayout(java.awt.Container parent)

Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.

Specified by:

invalidateLayout in interface java.awt.LayoutManager2

Parameters:

parent - the container that needs to be invalidated.

layoutContainer

public void layoutContainer(java.awt.Container parent)

Lays out the specified container using this proportion layout. This method reshapes components in the specified container in order to satisfy the constraints of this ProportionLayout object.

Specified by:

layoutContainer in interface java.awt.LayoutManager

Parameters:

parent - the container in which to do the layout.

toString

public java.lang.String toString()

Returns a string representation of this proportion layout's values.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this proportion layout.