com.jidesoft.swing

Class NavigationComponentHelper

java.lang.Object

com.jidesoft.swing.NavigationComponentHelper

public abstract class NavigationComponentHelper
extends Object

NavigationComponentHelper is a helper class to implement on JTree, JList and JTable (or JIDE table subclasses) so they can be used for the navigation purpose. In order to make the component suitable for the navigation, we want the selection effect to be easily noticeable and covers the row (instead of just one cell or one node in the case of JTable and JTree respectively). We also want to have rollover effect the mouse is over a row. Further more, the selection should have different color when the component is focused so that when multiple navigation components are used, we can tell which one is active. Some L&Fs already do it by default but the most L&Fs don't do it. This class provides some common code to make the implementation easy.

Constructor Summary

Constructors

Constructor and Description
NavigationComponentHelper()

Method Summary

Methods

Modifier and Type	Method and Description
void	focusGained(FocusEvent e)
void	focusLost(FocusEvent e)
Point	getMousePosition()
int	getRolloverRow() Gets the rollover row that currently has rollover effect.
protected abstract Rectangle	getRowBounds(int row) Gets the bounds of the row.
protected abstract int[]	getSelectedRows()
protected Color	getSelectionColor(JComponent c) Gets the color to paint the selected rows.
void	mouseClicked(MouseEvent e)
void	mouseEntered(MouseEvent e)
void	mouseExited(MouseEvent e)
void	mouseMoved(MouseEvent e)
void	mousePressed(MouseEvent e)
void	mouseReleased(MouseEvent e)
void	paint(Graphics g, JComponent c) Paints the rollover row and selection rows.
protected void	paintRolloverRow(Graphics g, JComponent c, int row) Paints the rollover row.
protected void	paintSelectedRow(Graphics g, JComponent c, int row) Paints the selected row.
void	repaintSelections(JComponent c)
protected abstract int	rowAtPoint(Point p)
void	setRolloverRow(int rolloverRow) Sets the rollover row.
void	setup(JComponent c)

Methods inherited from class java.lang.Object

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

Constructor Detail

NavigationComponentHelper

public NavigationComponentHelper()

Method Detail

getRowBounds

protected abstract Rectangle getRowBounds(int row)

Gets the bounds of the row.

Parameters:

row - the bounds of the specific row.

Returns:

the bounds of the row. Or null if there is no row at all or the specified row doesn't exist.

rowAtPoint

protected abstract int rowAtPoint(Point p)

getSelectedRows

protected abstract int[] getSelectedRows()

mouseMoved

public void mouseMoved(MouseEvent e)

mouseExited

public void mouseExited(MouseEvent e)

mousePressed

public void mousePressed(MouseEvent e)

mouseReleased

public void mouseReleased(MouseEvent e)

mouseClicked

public void mouseClicked(MouseEvent e)

mouseEntered

public void mouseEntered(MouseEvent e)

focusGained

public void focusGained(FocusEvent e)

focusLost

public void focusLost(FocusEvent e)

paint

public void paint(Graphics g,
         JComponent c)

Paints the rollover row and selection rows.

Parameters:

g - the Graphics

c - the component

paintSelectedRow

protected void paintSelectedRow(Graphics g,
                    JComponent c,
                    int row)

Paints the selected row. This method is called after the tree is painted. It will paint over the content of the tree. In order to not cover the content, the painting code must be semi-transparent. By default, we paint it using the selection color which can be retrieved from UIDefault "Tree.selectionBackground" but with an alpha between 70 to 100 to create a gradient effect.

Parameters:

g - the Graphics

c - the component

row - the row index

getSelectionColor

protected Color getSelectionColor(JComponent c)

Gets the color to paint the selected rows.

Parameters:

c - the component

Returns:

the selection color.

Since:

3.4.6

paintRolloverRow

protected void paintRolloverRow(Graphics g,
                    JComponent c,
                    int row)

Paints the rollover row. This method is called after the tree is painted. It will paint over the content of the tree. In order to not cover the content, the painting code must be semi-transparent. By default, we paint it using the selection color which can be retrieved from UIDefault "Tree.selectionBackground" but with an alpha between 10 to 40 to create a gradient effect.

Parameters:

g - the Graphics

c - the component

row - the row index

setup

public void setup(JComponent c)

repaintSelections

public void repaintSelections(JComponent c)

getRolloverRow

public int getRolloverRow()

Gets the rollover row that currently has rollover effect.

Returns:

the row that has the rollover effect.

setRolloverRow

public void setRolloverRow(int rolloverRow)

Sets the rollover row.

Parameters:

rolloverRow - the row to show the rollover effect.

getMousePosition

public Point getMousePosition()