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1
11 package org.eclipse.jdt.internal.ui.viewsupport;
12
13 import java.util.Iterator  ;
14
15 import org.eclipse.swt.SWT;
16 import org.eclipse.swt.graphics.Color;
17 import org.eclipse.swt.graphics.Font;
18 import org.eclipse.swt.graphics.GC;
19 import org.eclipse.swt.graphics.Image;
20 import org.eclipse.swt.graphics.Rectangle;
21 import org.eclipse.swt.graphics.TextLayout;
22 import org.eclipse.swt.graphics.TextStyle;
23 import org.eclipse.swt.widgets.Control;
24 import org.eclipse.swt.widgets.Display;
25 import org.eclipse.swt.widgets.Event;
26 import org.eclipse.swt.widgets.Item;
27 import org.eclipse.swt.widgets.Listener;
28 import org.eclipse.swt.widgets.TableItem;
29 import org.eclipse.swt.widgets.TreeItem;
30
31
34 public abstract class OwnerDrawSupport implements Listener {
35
36 private TextLayout fTextLayout;
37 private final Control fControl;
38
39 public OwnerDrawSupport(Control control) {
40 fControl= control;
41 fTextLayout= new TextLayout(control.getDisplay());
42
43 control.addListener(SWT.PaintItem, this);
44 control.addListener(SWT.EraseItem, this);
45 control.addListener(SWT.Dispose, this);
46 }
47
48
53 public abstract ColoredString getColoredLabel(Item item);
54
55
61 public abstract Color getColor(String foregroundColorName, Display display);
62
63
66 public void handleEvent(Event event) {
67 if (event.type == SWT.PaintItem) {
68 performPaint(event);
69 } else if (event.type == SWT.EraseItem) {
70 performErase(event);
71 } else if (event.type == SWT.Dispose) {
72 dispose();
73 }
74 }
75
76 private void performErase(Event event) {
77 event.detail &= ~SWT.FOREGROUND;
78 }
79
80 private void performPaint(Event event) {
81 Item item= (Item) event.item;
82 GC gc= event.gc;
83
84 ColoredString coloredLabel= getColoredLabel(item);
85 boolean isSelected= (event.detail & SWT.SELECTED) != 0 && fControl.isFocusControl();
86 if (item instanceof TreeItem) {
87 TreeItem treeItem= (TreeItem) item;
88 Image image = treeItem.getImage(event.index);
89 if (image != null) {
90 processImage(image, gc, treeItem.getImageBounds(event.index));
91 }
92 Rectangle textBounds= treeItem.getTextBounds(event.index);
93 Font font= treeItem.getFont(event.index);
94 processColoredLabel(coloredLabel, gc, textBounds, isSelected, font);
95
96 Rectangle bounds= treeItem.getBounds();
97 if ((event.detail & SWT.FOCUSED) != 0) {
98 gc.drawFocus(bounds.x, bounds.y, bounds.width, bounds.height);
99 }
100 } else if (item instanceof TableItem) {
101 TableItem tableItem= (TableItem) item;
102 Image image = tableItem.getImage(event.index);
103 if (image != null) {
104 processImage(image, gc, tableItem.getImageBounds(event.index));
105 }
106 Rectangle textBounds= tableItem.getTextBounds(event.index);
107 Font font= tableItem.getFont(event.index);
108 processColoredLabel(coloredLabel, gc, textBounds, isSelected, font);
109
110 Rectangle bounds= tableItem.getBounds();
111 if ((event.detail & SWT.FOCUSED) != 0) {
112 gc.drawFocus(bounds.x, bounds.y, bounds.width, bounds.height);
113 }
114 }
115 }
116
117 private void processImage(Image image, GC gc, Rectangle imageBounds) {
118 Rectangle bounds= image.getBounds();
119 int x= imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2);
120 int y= imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2);
121 gc.drawImage(image, x, y);
122 }
123
124 private void processColoredLabel(ColoredString richLabel, GC gc, Rectangle textBounds, boolean isSelected, Font font) {
125 String text= richLabel.getString();
126 fTextLayout.setText(text);
127 fTextLayout.setFont(font);
128
129 if (!isSelected) {
130 Display display= (Display) gc.getDevice();
132 Iterator ranges= richLabel.getRanges();
133 while (ranges.hasNext()) {
134 ColoredString.StyleRange curr= (ColoredString.StyleRange) ranges.next();
135 ColoredString.Style style= curr.style;
136 if (style != null) {
137 Color foreground= getColor(style.getForegroundColorName(), display);
138 TextStyle textStyle= new TextStyle(null, foreground, null);
139 fTextLayout.setStyle(textStyle, curr.offset, curr.offset + curr.length - 1);
140 }
141 }
142 }
143
144 Rectangle bounds= fTextLayout.getBounds();
145 int x= textBounds.x;
146 int y = textBounds.y + Math.max(0, (textBounds.height - bounds.height) / 2);
147
148 fTextLayout.draw(gc, x, y);
149 fTextLayout.setText(""); }
151
152 public void dispose() {
153 if (fTextLayout != null) {
154 fTextLayout.dispose();
155 fTextLayout= null;
156 }
157 if (!fControl.isDisposed()) {
158 fControl.removeListener(SWT.PaintItem, this);
159 fControl.removeListener(SWT.EraseItem, this);
160 fControl.removeListener(SWT.Dispose, this);
161 }
162 }
163 }
164 |
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