Java User Code: Rendering a JTable Header

User Code: Rendering a JTable Header

The following is a renderer for JTable headers that supports tooltips
and icons.

/**
* To support column header icons and tool tips. :-)
* Usage:
* >P<
* >PRE<
* MyHeaderRenderer mhr = new MyHeaderRenderer();
* mhr.setToolTip(toolTipText);
* mhr.setIcon(icon);
* TableColumn col = getColumnModel().getColumn(columnIndex);
* col.setHeaderRenderer(mhr);
* >/PRE<
* This means that you need a new MyHeaderRenderer for each column. The alternative
* would have been to use only one global renderer and do all the column (index)
* mappings within this class which would save memory but would be slower. ;-)
*/
class MyHeaderRenderer extends DefaultTableCellRenderer {

/** label to display also an icon */
JLabel label = null;

/**
*/
public MyHeaderRenderer() {
super();
label = new JLabel();
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setOpaque(true);
}//constructor

/**
* Overwrites DefaultTableCellRenderer.
*/
public Component getTableCellRendererComponent(JTable table, Object
value, boolean isSelected,
boolean hasFocus, int row,
int column) {

if (value != null) {
label.setText("" + value);
} else {
label.setText("");
}

return label;
}//getTableCellRendererComponent()

/**
* Overwrires DefaultTableCellRenderer.
*/
protected void setValue(Object value) {
if (value != null) {
label.setText("" + value);
} else {
label.setText("");
}
}//setValue()

/**
* @param toolTip text to use for label's tool tip
*/
public void setToolTip(String toolTip) {
if (toolTip != null) {
label.setToolTipText(toolTip);
}
}//setToolTip()

/**
* @param icon icon to set for the label
*/
public void setIcon(Icon icon) {
if (label != null) {
label.setIcon(icon);
}
}//setIcon()

}//MyHeaderRenderer

The following is a renderer for JTable headers that supports tooltips
and icons.

/**
* To support column header icons and tool tips. :-)
* Usage:
* <P>
* <PRE>
* MyHeaderRenderer mhr = new MyHeaderRenderer();
* mhr.setToolTip(toolTipText);
* mhr.setIcon(icon);
* TableColumn col = getColumnModel().getColumn(columnIndex);
* col.setHeaderRenderer(mhr);
* </PRE>
* This means that you need a new MyHeaderRenderer for each column. The alternative
* would have been to use only one global renderer and do all the column (index)
* mappings within this class which would save memory but would be slower. ;-)
*/
class MyHeaderRenderer extends DefaultTableCellRenderer {

/** label to display also an icon */
JLabel label = null;

/**
*/
public MyHeaderRenderer() {
super();
label = new JLabel();
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setOpaque(true);
}//constructor

/**
* Overwrites DefaultTableCellRenderer.
*/
public Component getTableCellRendererComponent(JTable table, Object
value, boolean isSelected,
boolean hasFocus, int row,
int column) {

if (value != null) {
label.setText("" + value);
} else {
label.setText("");
}

return label;
}//getTableCellRendererComponent()

/**
* Overwrires DefaultTableCellRenderer.
*/
protected void setValue(Object value) {
if (value != null) {
label.setText("" + value);
} else {
label.setText("");
}
}//setValue()

/**
* @param toolTip text to use for label's tool tip
*/
public void setToolTip(String toolTip) {
if (toolTip != null) {
label.setToolTipText(toolTip);
}
}//setToolTip()

/**
* @param icon icon to set for the label
*/
public void setIcon(Icon icon) {
if (label != null) {
label.setIcon(icon);
}
}//setIcon()

}//MyHeaderRenderer

Latest Posts

Related Stories