Java Reference
In-Depth Information
Figure 9-23. Replacing all panels with the new SystemColor chooser panel
The first method to define is public String getDisplayName() . This method returns a text
label to display on the tab when multiple chooser panels are available. If there's only one chooser
panel, this name isn't shown.
public String getDisplayName() {
return "SystemColor";
}
The return values for the two Icon methods do nothing with the system look and feel types.
You can return null from them or return an Icon to check that nothing has been done with
them. A custom ColorChooserUI could use the two Icon methods somewhere, possibly for the
icon on a chooser panel tab.
public Icon getSmallDisplayIcon() {
return new DiamondIcon(Color.BLUE);
}
public Icon getLargeDisplayIcon() {
return new DiamondIcon(Color.GREEN);
}
The protected void buildChooser() method is called by the installChooserPanel() method
of AbstractColorChooserPanel when the panel is added to the chooser. You use this method to
add the necessary components to the container. In the sample SystemColorChooserPanel
chooser, this involves creating the JComboBox and adding it to the panel. Because
AbstractColorChooserPanel is a JPanel subclass, you can just add() the combo box. The combo
box must be filled with options and an event handler installed for when the user selects the
component. The specifics of the event handling are described after the following block of
source code.
protected void buildChooser() {
comboBox = new JComboBox(labels);
comboBox.addItemListener(this);
add(comboBox);
}
 
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