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- All Known Implementing Classes:
- ActionMapUIResource, BasicBorders.ButtonBorder, BasicBorders.FieldBorder, BasicBorders.MarginBorder, BasicBorders.MenuBarBorder, BasicBorders.RadioButtonBorder, BasicBorders.RolloverButtonBorder, BasicBorders.SplitPaneBorder, BasicBorders.ToggleButtonBorder, 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.Flush3DBorder, MetalBorders.InternalFrameBorder, MetalBorders.MenuBarBorder, MetalBorders.MenuItemBorder, MetalBorders.OptionDialogBorder, MetalBorders.PaletteBorder, MetalBorders.PopupMenuBorder, MetalBorders.RolloverButtonBorder, MetalBorders.ScrollPaneBorder, MetalBorders.TextFieldBorder, MetalBorders.ToggleButtonBorder, MetalBorders.ToolBarBorder, MetalCheckBoxIcon, MetalComboBoxEditor.UIResource, MetalIconFactory.PaletteCloseIcon, ScrollPaneLayout.UIResource
public interface UIResource
This interface is used to mark objects created by ComponentUI delegates. TheComponentUI.installUI()
andComponentUI.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")); }
- See Also:
ComponentUI
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Steph