uTools-Manuals/docs/java/javax/swing/plaf/UIResource.html

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     javax.swing.plaf 
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<h2 class="title" title="Interface UIResource">Interface UIResource</h2>
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        所有已知实现类：
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<span><a href="../../../javax/swing/plaf/ActionMapUIResource.html" title="javax.swing.plaf中的类">ActionMapUIResource</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.ButtonBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.ButtonBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.FieldBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.FieldBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.MarginBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.MarginBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.MenuBarBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.MenuBarBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.RadioButtonBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.RadioButtonBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.RolloverButtonBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.RolloverButtonBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.SplitPaneBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.SplitPaneBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicBorders.ToggleButtonBorder.html" title="javax.swing.plaf.basic中的类">BasicBorders.ToggleButtonBorder</a> ， <a href="../../../javax/swing/plaf/basic/BasicComboBoxEditor.UIResource.html" title="javax.swing.plaf.basic中的类">BasicComboBoxEditor.UIResource</a> ， <a href="../../../javax/swing/plaf/basic/BasicComboBoxRenderer.UIResource.html" title="javax.swing.plaf.basic中的类">BasicComboBoxRenderer.UIResource</a> ， <a href="../../../javax/swing/plaf/basic/BasicTextUI.BasicCaret.html" title="javax.swing.plaf.basic中的类">BasicTextUI.BasicCaret</a> ， <a href="../../../javax/swing/plaf/basic/BasicTextUI.BasicHighlighter.html" title="javax.swing.plaf.basic中的类">BasicTextUI.BasicHighlighter</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.BevelBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.BevelBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.CompoundBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.CompoundBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.EmptyBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.EmptyBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.EtchedBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.EtchedBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.LineBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.LineBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.MatteBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.MatteBorderUIResource</a> ， <a href="../../../javax/swing/plaf/BorderUIResource.TitledBorderUIResource.html" title="javax.swing.plaf中的类">BorderUIResource.TitledBorderUIResource</a> ， <a href="../../../javax/swing/plaf/ColorUIResource.html" title="javax.swing.plaf中的类">ColorUIResource</a> ， <a href="../../../javax/swing/plaf/ComponentInputMapUIResource.html" title="javax.swing.plaf中的类">ComponentInputMapUIResource</a> ， <a href="../../../javax/swing/DefaultListCellRenderer.UIResource.html" title="javax.swing中的类">DefaultListCellRenderer.UIResource</a> ， <a href="../../../javax/swing/plaf/basic/DefaultMenuLayout.html" title="javax.swing.plaf.basic中的类">DefaultMenuLayout</a> ， <a href="../../../javax/swing/table/DefaultTableCellRenderer.UIResource.html" title="javax.swing.table中的类">DefaultTableCellRenderer.UIResource</a> ， <a href="../../../javax/swing/plaf/DimensionUIResource.html" title="javax.swing.plaf中的类">DimensionUIResource</a> ， <a href="../../../javax/swing/plaf/FontUIResource.html" title="javax.swing.plaf中的类">FontUIResource</a> ， <a href="../../../javax/swing/plaf/IconUIResource.html" title="javax.swing.plaf中的类">IconUIResource</a> ， <a href="../../../javax/swing/plaf/InputMapUIResource.html" title="javax.swing.plaf中的类">InputMapUIResource</a> ， <a href="../../../javax/swing/plaf/InsetsUIResource.html" title="javax.swing.plaf中的类">InsetsUIResource</a> ， <a href="../../../javax/swing/JScrollPane.ScrollBar.html" title="javax.swing中的类">JScrollPane.ScrollBar</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.ButtonBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.ButtonBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.Flush3DBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.Flush3DBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.InternalFrameBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.InternalFrameBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.MenuBarBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.MenuBarBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.MenuItemBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.MenuItemBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.OptionDialogBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.OptionDialogBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.PaletteBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.PaletteBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.PopupMenuBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.PopupMenuBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.RolloverButtonBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.RolloverButtonBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.ScrollPaneBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.ScrollPaneBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.TextFieldBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.TextFieldBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.ToggleButtonBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.ToggleButtonBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalBorders.ToolBarBorder.html" title="javax.swing.plaf.metal中的类">MetalBorders.ToolBarBorder</a> ， <a href="../../../javax/swing/plaf/metal/MetalCheckBoxIcon.html" title="javax.swing.plaf.metal中的类">MetalCheckBoxIcon</a> ， <a href="../../../javax/swing/plaf/metal/MetalComboBoxEditor.UIResource.html" title="javax.swing.plaf.metal中的类">MetalComboBoxEditor.UIResource</a> ， <a href="../../../javax/swing/plaf/metal/MetalIconFactory.PaletteCloseIcon.html" title="javax.swing.plaf.metal中的类">MetalIconFactory.PaletteCloseIcon</a> ， <a href="../../../javax/swing/ScrollPaneLayout.UIResource.html" title="javax.swing中的类">ScrollPaneLayout.UIResource</a></span>
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<hr/> <br/> <pre>public interface <span class="typeNameLabel">UIResource</span></pre>
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<span>此接口用于标记由ComponentUI委托创建的对象。</span>
<span><code>ComponentUI.installUI()</code>和<code>ComponentUI.uninstallUI()</code>方法可以使用此接口来决定属性值是否已被覆盖。</span>
<span>例如，JList cellRenderer属性由BasicListUI.installUI（）初始化，只有当它的初始值为null时：</span>
<pre>  <span>if (list.getCellRenderer() == null) {
     list.setCellRenderer((ListCellRenderer)(UIManager.get("List.cellRenderer")));
 }</span> </pre>
<span>在uninstallUI（）时间，如果该值为UIResource的实例，则将该属性重置为null</span>
<pre>  <span>if (list.getCellRenderer() instanceof UIResource) {
     list.setCellRenderer(null);
 }</span> </pre>
<span>此模式适用于除java.awt.Component属性字体，前景和背景之外的所有属性。</span>
<span>如果这些属性之一未初始化，或者显式设置为null，则其容器将提供该值。</span>
<span>因此， <code>"== null"</code> installUI（）来动态更改组件外观时，"== null"是不可靠的。</span>
<span>所以在installUI（）时候，我们检查当前值是否是UIResource：</span>
<pre>  <span>if (!(list.getFont() instanceof UIResource)) {
     list.setFont(UIManager.getFont("List.font"));
 }</span> </pre>
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<span class="seeLabel">另请参见：</span>
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<span><a href="../../../javax/swing/plaf/ComponentUI.html" title="javax.swing.plaf中的类"><code>ComponentUI</code></a></span>
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