30 31 import javax.swing.*; 32 import javax.swing.plaf.*; 33 import javax.swing.plaf.basic.*; 34 35 36 import java.awt.*; 37 38 39 /** 40 * A Windows L&F implementation of LabelUI. This implementation 41 * is completely static, i.e. there's only one UIView implementation 42 * that's shared by all JLabel objects. 43 * 44 * @author Hans Muller 45 */ 46 47 public class MetalLabelUI extends BasicLabelUI 48 { 49 /** 50 * The default <code>MetalLabelUI</code> instance. This field might 51 * not be used. To change the default instance use a subclass which 52 * overrides the <code>createUI</code> method, and place that class 53 * name in defaults table under the key "LabelUI". 54 */ 55 protected static MetalLabelUI metalLabelUI = new MetalLabelUI(); 56 57 private static final Object METAL_LABEL_UI_KEY = new Object(); 58 59 /** 60 * Returns an instance of {@code MetalLabelUI}. 61 * 62 * @param c a component 63 * @return an instance of {@code MetalLabelUI} 64 */ 65 public static ComponentUI createUI(JComponent c) { 66 if (System.getSecurityManager() != null) { 67 AppContext appContext = AppContext.getAppContext(); 68 MetalLabelUI safeMetalLabelUI = 69 (MetalLabelUI) appContext.get(METAL_LABEL_UI_KEY); 70 if (safeMetalLabelUI == null) { 71 safeMetalLabelUI = new MetalLabelUI(); 72 appContext.put(METAL_LABEL_UI_KEY, safeMetalLabelUI); | 30 31 import javax.swing.*; 32 import javax.swing.plaf.*; 33 import javax.swing.plaf.basic.*; 34 35 36 import java.awt.*; 37 38 39 /** 40 * A Windows L&F implementation of LabelUI. This implementation 41 * is completely static, i.e. there's only one UIView implementation 42 * that's shared by all JLabel objects. 43 * 44 * @author Hans Muller 45 */ 46 47 public class MetalLabelUI extends BasicLabelUI 48 { 49 /** 50 * The default {@code MetalLabelUI} instance. This field might 51 * not be used. To change the default instance use a subclass which 52 * overrides the {@code createUI} method, and place that class 53 * name in defaults table under the key "LabelUI". 54 */ 55 protected static MetalLabelUI metalLabelUI = new MetalLabelUI(); 56 57 private static final Object METAL_LABEL_UI_KEY = new Object(); 58 59 /** 60 * Returns an instance of {@code MetalLabelUI}. 61 * 62 * @param c a component 63 * @return an instance of {@code MetalLabelUI} 64 */ 65 public static ComponentUI createUI(JComponent c) { 66 if (System.getSecurityManager() != null) { 67 AppContext appContext = AppContext.getAppContext(); 68 MetalLabelUI safeMetalLabelUI = 69 (MetalLabelUI) appContext.get(METAL_LABEL_UI_KEY); 70 if (safeMetalLabelUI == null) { 71 safeMetalLabelUI = new MetalLabelUI(); 72 appContext.put(METAL_LABEL_UI_KEY, safeMetalLabelUI); |