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Java > Open Source Codes > org > eclipse > jdt > internal > ui > typehierarchy > HierarchyLabelProvider


1 /*******************************************************************************
2  * Copyright (c) 2000, 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/

11 package org.eclipse.jdt.internal.ui.typehierarchy;
12
13 import org.eclipse.swt.SWT;
14 import org.eclipse.swt.graphics.Color;
15 import org.eclipse.swt.graphics.Image;
16 import org.eclipse.swt.graphics.ImageData;
17 import org.eclipse.swt.graphics.Point;
18 import org.eclipse.swt.widgets.Display;
19
20 import org.eclipse.jface.resource.CompositeImageDescriptor;
21 import org.eclipse.jface.resource.ImageDescriptor;
22 import org.eclipse.jface.resource.JFaceResources;
23 import org.eclipse.jface.viewers.ViewerFilter;
24
25 import org.eclipse.jdt.core.Flags;
26 import org.eclipse.jdt.core.IJavaElement;
27 import org.eclipse.jdt.core.IMethod;
28 import org.eclipse.jdt.core.IType;
29 import org.eclipse.jdt.core.ITypeHierarchy;
30
31 import org.eclipse.jdt.ui.JavaElementImageDescriptor;
32 import org.eclipse.jdt.ui.JavaElementLabels;
33
34 import org.eclipse.jdt.internal.ui.JavaPlugin;
35 import org.eclipse.jdt.internal.ui.JavaPluginImages;
36 import org.eclipse.jdt.internal.ui.viewsupport.AppearanceAwareLabelProvider;
37 import org.eclipse.jdt.internal.ui.viewsupport.ColoredViewersManager;
38 import org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider;
39
40 /**
41  * Label provider for the hierarchy viewers. Types in the hierarchy that are not belonging to the
42  * input scope are rendered differently.
43   */

44 public class HierarchyLabelProvider extends AppearanceAwareLabelProvider {
45
46     private static class FocusDescriptor extends CompositeImageDescriptor {
47         private ImageDescriptor fBase;
48         public FocusDescriptor(ImageDescriptor base) {
49             fBase= base;
50         }
51         protected void drawCompositeImage(int width, int height) {
52             drawImage(getImageData(fBase), 0, 0);
53             drawImage(getImageData(JavaPluginImages.DESC_OVR_FOCUS), 0, 0);
54         }
55         
56         private ImageData getImageData(ImageDescriptor descriptor) {
57             ImageData data= descriptor.getImageData(); // see bug 51965: getImageData can return null
58
if (data == null) {
59                 data= DEFAULT_IMAGE_DATA;
60                 JavaPlugin.logErrorMessage("Image data not available: " + descriptor.toString()); //$NON-NLS-1$
61
}
62             return data;
63         }
64         
65         protected Point getSize() {
66             return JavaElementImageProvider.BIG_SIZE;
67         }
68         public int hashCode() {
69             return fBase.hashCode();
70         }
71         public boolean equals(Object JavaDoc object) {
72             return object != null && FocusDescriptor.class.equals(object.getClass()) && ((FocusDescriptor)object).fBase.equals(fBase);
73         }
74     }
75
76     private Color fSpecialColor;
77
78     private ViewerFilter fFilter;
79     
80     private TypeHierarchyLifeCycle fHierarchy;
81     
82     public HierarchyLabelProvider(TypeHierarchyLifeCycle lifeCycle) {
83         super(DEFAULT_TEXTFLAGS | JavaElementLabels.USE_RESOLVED, DEFAULT_IMAGEFLAGS);
84         
85         fHierarchy= lifeCycle;
86         fFilter= null;
87     }
88
89     /**
90      * @return Returns the filter.
91      */

92     public ViewerFilter getFilter() {
93         return fFilter;
94     }
95
96     /**
97      * @param filter The filter to set.
98      */

99     public void setFilter(ViewerFilter filter) {
100         fFilter= filter;
101     }
102
103     protected boolean isDifferentScope(IType type) {
104         if (fFilter != null && !fFilter.select(null, null, type)) {
105             return true;
106         }
107         
108         IJavaElement input= fHierarchy.getInputElement();
109         if (input == null || input.getElementType() == IJavaElement.TYPE) {
110             return false;
111         }
112             
113         IJavaElement parent= type.getAncestor(input.getElementType());
114         if (input.getElementType() == IJavaElement.PACKAGE_FRAGMENT) {
115             if (parent == null || parent.getElementName().equals(input.getElementName())) {
116                 return false;
117             }
118         } else if (input.equals(parent)) {
119             return false;
120         }
121         return true;
122     }
123         
124     /* (non-Javadoc)
125      * @see ILabelProvider#getImage
126      */

127     public Image getImage(Object JavaDoc element) {
128         Image result= null;
129         if (element instanceof IType) {
130             ImageDescriptor desc= getTypeImageDescriptor((IType) element);
131             if (desc != null) {
132                 if (element.equals(fHierarchy.getInputElement())) {
133                     desc= new FocusDescriptor(desc);
134                 }
135                 result= JavaPlugin.getImageDescriptorRegistry().get(desc);
136             }
137         } else {
138             result= fImageLabelProvider.getImageLabel(element, evaluateImageFlags(element));
139         }
140         return decorateImage(result, element);
141     }
142
143     private ImageDescriptor getTypeImageDescriptor(IType type) {
144         ITypeHierarchy hierarchy= fHierarchy.getHierarchy();
145         if (hierarchy == null) {
146             return new JavaElementImageDescriptor(JavaPluginImages.DESC_OBJS_CLASS, 0, JavaElementImageProvider.BIG_SIZE);
147         }
148         
149         int flags= hierarchy.getCachedFlags(type);
150         if (flags == -1) {
151             return new JavaElementImageDescriptor(JavaPluginImages.DESC_OBJS_CLASS, 0, JavaElementImageProvider.BIG_SIZE);
152         }
153         
154         boolean isInterface= Flags.isInterface(flags);
155         boolean isInner= (type.getDeclaringType() != null);
156         
157         ImageDescriptor desc= JavaElementImageProvider.getTypeImageDescriptor(isInner, false, flags, isDifferentScope(type));
158
159         int adornmentFlags= 0;
160         if (Flags.isFinal(flags)) {
161             adornmentFlags |= JavaElementImageDescriptor.FINAL;
162         }
163         if (Flags.isAbstract(flags) && !isInterface) {
164             adornmentFlags |= JavaElementImageDescriptor.ABSTRACT;
165         }
166         if (Flags.isStatic(flags)) {
167             adornmentFlags |= JavaElementImageDescriptor.STATIC;
168         }
169         
170         return new JavaElementImageDescriptor(desc, adornmentFlags, JavaElementImageProvider.BIG_SIZE);
171     }
172         
173     /* (non-Javadoc)
174      * @see org.eclipse.jface.viewers.IColorProvider#getForeground(java.lang.Object)
175      */

176     public Color getForeground(Object JavaDoc element) {
177         if (element instanceof IMethod) {
178             if (fSpecialColor == null) {
179                 fSpecialColor= Display.getCurrent().getSystemColor(SWT.COLOR_DARK_BLUE);
180             }
181             return fSpecialColor;
182         } else if (element instanceof IType && isDifferentScope((IType) element)) {
183             return JFaceResources.getColorRegistry().get(ColoredViewersManager.QUALIFIER_COLOR_NAME);
184         }
185         return null;
186     }
187     
188     
189
190 }
191
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