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javax.swing.plaf
interface UIResource
- All Known Implementing Classes:
- ActionMapUIResource, BasicBorders.ButtonBorder, BasicBorders.RadioButtonBorder, BasicBorders.RolloverButtonBorder, BasicBorders.ToggleButtonBorder, BasicBorders.FieldBorder, BasicBorders.MarginBorder, BasicBorders.MenuBarBorder, BasicBorders.SplitPaneBorder, BasicComboBoxEditor.UIResource, BasicComboBoxRenderer.UIResource, BasicTextUI.BasicCaret, BasicTextUI.BasicHighlighter, BorderUIResource, BorderUIResource.BevelBorderUIResource, BorderUIResource.CompoundBorderUIResource, BorderUIResource.EmptyBorderUIResource, BorderUIResource.EtchedBorderUIResource, BorderUIResource.LineBorderUIResource, BorderUIResource.MatteBorderUIResource, BorderUIResource.TitledBorderUIResource, ColorUIResource, ComponentInputMapUIResource, DefaultListCellRenderer.UIResource, DefaultMenuLayout, DefaultTableCellRenderer.UIResource, DimensionUIResource, FontUIResource, IconUIResource, InputMapUIResource, InsetsUIResource, JScrollPane.ScrollBar, MetalBorders.ButtonBorder, MetalBorders.RolloverButtonBorder, MetalBorders.ToggleButtonBorder, MetalBorders.Flush3DBorder, MetalBorders.TextFieldBorder, MetalBorders.InternalFrameBorder, MetalBorders.MenuBarBorder, MetalBorders.MenuItemBorder, MetalBorders.OptionDialogBorder, MetalBorders.PaletteBorder, MetalBorders.PopupMenuBorder, MetalBorders.ScrollPaneBorder, MetalBorders.ToolBarBorder, MetalCheckBoxIcon, MetalComboBoxEditor.UIResource, MetalIconFactory.PaletteCloseIcon, ScrollPaneLayout.UIResource
public interface UIResource
This interface is used to mark objects created by ComponentUI delegates.
The ComponentUI.installUI()
and
ComponentUI.uninstallUI()
methods can use this interface
to decide if a properties value has been overridden. For example, the
JList cellRenderer property is initialized by BasicListUI.installUI(),
only if it's initial value is null:
if (list.getCellRenderer() == null) {
list.setCellRenderer((ListCellRenderer)(UIManager.get("List.cellRenderer")));
}
At uninstallUI() time we reset the property to null if its value
is an instance of UIResource:
if (list.getCellRenderer() instanceof UIResource) {
list.setCellRenderer(null);
}
This pattern applies to all properties except the java.awt.Component
properties font, foreground, and background. If one of these
properties isn't initialized, or is explicitly set to null,
its container provides the value. For this reason the
"== null"
is unreliable when installUI() is called
to dynamically change a components look and feel. So at installUI()
time we check to see if the current value is a UIResource:
if (!(list.getFont() instanceof UIResource)) {
list.setFont(UIManager.getFont("List.font"));
}
This documentation differs from the official API.
Jadeite adds
extra features to the API including:
variable font sizes,
constructions examples,
placeholders for classes and methods, and auto-generated “See Also” links.
Additionally it
is missing some items found in standard Javadoc documentation, including:
generics type information,
“Deprecated” tags and comments,
“See Also” links,
along with other minor differences.
Please send any questions or feedback to
bam@cs.cmu.edu.
This page displays the
Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
The official Sun™ documentation can be found here at
http://java.sun.com/javase/6/docs/api/.