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1
12 package org.eclipse.ui.forms.widgets;
13
14 import org.eclipse.swt.SWT;
15 import org.eclipse.swt.graphics.*;
16 import org.eclipse.swt.widgets.Composite;
17 import org.eclipse.swt.widgets.Event;
18
19
34 public class ImageHyperlink extends Hyperlink {
35
38 public int textSpacing = 5;
39
40 private Image image;
41
42 private Image hoverImage;
43
44 private Image activeImage;
45
46 private int state;
47
48 private static final int HOVER = 1 << 1;
49
50 private static final int ACTIVE = 1 << 2;
51
52 private int verticalAlignment = SWT.CENTER;
53
54 private int horizontalAlignment = SWT.LEFT;
55
56
64 public ImageHyperlink(Composite parent, int style) {
65 super(parent, removeAlignment(style));
66 extractAlignment(style);
67 }
68
69
74 protected void paintHyperlink(GC gc) {
75 paintHyperlink(gc, getClientArea());
76 }
77
78 protected void paintHyperlink(GC gc, Rectangle bounds) {
79 Image image = null;
80 if ((state & ACTIVE) != 0)
81 image = activeImage;
82 else if ((state & HOVER) != 0)
83 image = hoverImage;
84 if (image == null)
85 image = this.image;
86 Rectangle ibounds = image != null ? image.getBounds() : new Rectangle(0, 0, 0, 0);
87 Point maxsize = computeMaxImageSize();
88 int spacing = image!=null?textSpacing:0;
89 int textWidth = bounds.width - maxsize.x - spacing
90 - marginWidth - marginWidth;
91 int y = bounds.y+marginHeight + maxsize.y / 2 - ibounds.height / 2;
92
93 if (horizontalAlignment == SWT.LEFT) {
94 int x = bounds.x+marginWidth + maxsize.x / 2 - ibounds.width / 2;
95 int textX = bounds.x + marginWidth + maxsize.x + spacing;
96 if (image != null)
97 gc.drawImage(image, x, y);
98 if (getText() != null)
99 drawText(gc, bounds, textX, textWidth);
100 } else if (horizontalAlignment == SWT.RIGHT) {
101 int x = bounds.x+marginWidth;
102 if (getText() != null) {
103 x += drawText(gc, bounds, x, textWidth);
104 }
105 x += maxsize.x / 2 - ibounds.width / 2 + spacing;
106 if (image != null)
107 gc.drawImage(image, x, y);
108 }
109 }
110
111 private int drawText(GC gc, Rectangle clientArea, int textX, int textWidth) {
112 Point textSize = computeTextSize(textWidth, SWT.DEFAULT);
113 int slotHeight = clientArea.height - marginHeight - marginHeight;
114 int textY;
115 textWidth = textSize.x;
116 int textHeight = textSize.y;
117 if (verticalAlignment == SWT.BOTTOM) {
118 textY = marginHeight + slotHeight - textHeight;
119 } else if (verticalAlignment == SWT.CENTER) {
120 textY = marginHeight + slotHeight / 2 - textHeight / 2;
121 } else {
122 textY = marginHeight;
123 }
124 paintText(gc, new Rectangle(textX, textY, textWidth, textHeight));
125 return textWidth;
126 }
127
128
140 public Point computeSize(int wHint, int hHint, boolean changed) {
141 checkWidget();
142 Point isize = computeMaxImageSize();
143 int spacing = isize.x>0?textSpacing:0;
144 Point textSize = null;
145 if (getText() != null) {
146 int innerWHint = wHint;
147 if (wHint != SWT.DEFAULT) {
148 innerWHint = wHint - 2 * marginWidth - isize.x - spacing;
149 }
150 textSize = super.computeSize(innerWHint, hHint, changed);
151 }
152 int width = isize.x;
153 int height = isize.y;
154 if (textSize != null) {
155 width += spacing;
156 width += textSize.x;
157 height = Math.max(height, textSize.y);
158 }
159 width += 2 * marginWidth;
160 height += 2 * marginHeight;
161 return new Point(width, height);
162 }
163
164 protected void handleEnter(Event e) {
165 state = HOVER;
166 super.handleEnter(e);
167 }
168
169 protected void handleExit(Event e) {
170 state = 0;
171 super.handleExit(e);
172 }
173
174 protected void handleActivate(Event e) {
175 state &= ACTIVE;
176 redraw();
177 super.handleActivate(e);
178 state &= ~ACTIVE;
179 if (!isDisposed())
180 redraw();
181 }
182
183
188 public Image getActiveImage() {
189 return activeImage;
190 }
191
192
198 public void setActiveImage(Image activeImage) {
199 this.activeImage = activeImage;
200 }
201
202
207 public Image getHoverImage() {
208 return hoverImage;
209 }
210
211
216 public void setHoverImage(Image hoverImage) {
217 this.hoverImage = hoverImage;
218 }
219
220
225 public Image getImage() {
226 return image;
227 }
228
229
234 public void setImage(Image image) {
235 this.image = image;
236 }
237
238 private Point computeMaxImageSize() {
239 int x = 0;
240 int y = 0;
241 if (image != null) {
242 x = Math.max(image.getBounds().width, x);
243 y = Math.max(image.getBounds().height, y);
244 }
245 if (hoverImage != null) {
246 x = Math.max(hoverImage.getBounds().width, x);
247 y = Math.max(hoverImage.getBounds().height, y);
248 }
249 if (activeImage != null) {
250 x = Math.max(activeImage.getBounds().width, x);
251 y = Math.max(activeImage.getBounds().height, y);
252 }
253 return new Point(x, y);
254 }
255
256 private static int removeAlignment(int style) {
257 int resultStyle = style;
258 if ((style & SWT.CENTER) != 0) {
259 resultStyle &= (~SWT.CENTER);
260 }
261 if ((style & SWT.TOP) != 0) {
262 resultStyle &= (~SWT.TOP);
263 }
264 if ((style & SWT.BOTTOM) != 0) {
265 resultStyle &= (~SWT.BOTTOM);
266 }
267 if ((style & SWT.LEFT) != 0) {
268 resultStyle &= (~SWT.LEFT);
269 }
270 if ((style & SWT.RIGHT) != 0) {
271 resultStyle &= (~SWT.RIGHT);
272 }
273 return resultStyle;
274 }
275
276 private void extractAlignment(int style) {
277 if ((style & SWT.CENTER) != 0) {
278 verticalAlignment = SWT.CENTER;
279 } else if ((style & SWT.TOP) != 0) {
280 verticalAlignment = SWT.TOP;
281 } else if ((style & SWT.BOTTOM) != 0) {
282 verticalAlignment = SWT.BOTTOM;
283 }
284 if ((style & SWT.LEFT) != 0) {
285 horizontalAlignment = SWT.LEFT;
286 } else if ((style & SWT.RIGHT) != 0) {
287 horizontalAlignment = SWT.RIGHT;
288 }
289 }
290 }
291 |
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