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javax.swing.plaf
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Java 2 Platform SE v1.3.1: Interface UIResource - JDK 5 Documentation v1.3.1, Java 2 SDK 英文文档
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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javax.swing.plaf
Interface UIResource
- All Known Implementing Classes:
- ActionMapUIResource, BorderUIResource, BorderUIResource.BevelBorderUIResource, BorderUIResource.CompoundBorderUIResource, BorderUIResource.EmptyBorderUIResource, BorderUIResource.EtchedBorderUIResource, BorderUIResource.LineBorderUIResource, BorderUIResource.MatteBorderUIResource, BorderUIResource.TitledBorderUIResource, ColorUIResource, ComponentInputMapUIResource, DefaultListCellRenderer.UIResource, DefaultTableCellRenderer.UIResource, DimensionUIResource, FontUIResource, InputMapUIResource, InsetsUIResource, JScrollPane.ScrollBar, ScrollPaneLayout.UIResource, IconUIResource, DefaultMenuLayout, BasicTextUI.BasicCaret, BasicTextUI.BasicHighlighter, BasicBorders.ButtonBorder, BasicBorders.MenuBarBorder, BasicBorders.MarginBorder, BasicBorders.FieldBorder, BasicBorders.SplitPaneBorder, BasicComboBoxRenderer.UIResource, BasicComboBoxEditor.UIResource, MetalComboBoxEditor.UIResource, MetalCheckBoxIcon, MetalBorders.Flush3DBorder, MetalBorders.ButtonBorder, MetalBorders.InternalFrameBorder, MetalBorders.PaletteBorder, MetalBorders.OptionDialogBorder, MetalBorders.MenuBarBorder, MetalBorders.MenuItemBorder, MetalBorders.PopupMenuBorder, MetalBorders.ToolBarBorder, MetalBorders.ScrollPaneBorder, MetalIconFactory.PaletteCloseIcon
- 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"));
}
- See Also:
ComponentUI
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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