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11 package org.eclipse.help.ui.internal;
12 import java.util.Enumeration  ;
13 import java.util.Hashtable ;
14
15 import org.eclipse.swt.*;
16 import org.eclipse.swt.events.*;
17 import org.eclipse.swt.graphics.*;
18 import org.eclipse.swt.widgets.*;
19
20 public class HyperlinkHandler
21 implements
22 MouseListener,
23 MouseTrackListener,
24 PaintListener,
25 Listener {
26 public static final int UNDERLINE_NEVER = 1;
27 public static final int UNDERLINE_ROLLOVER = 2;
28 public static final int UNDERLINE_ALWAYS = 3;
29 private Cursor hyperlinkCursor;
30 private Cursor busyCursor;
31 private boolean hyperlinkCursorUsed = true;
32 private int hyperlinkUnderlineMode = UNDERLINE_ALWAYS;
33 private Color background;
34 private Color foreground;
35 private Color activeBackground;
36 private Color activeForeground;
37 private Hashtable hyperlinkListeners;
38 private Control lastLink;
39
42 public HyperlinkHandler() {
43 hyperlinkListeners = new Hashtable ();
44 hyperlinkCursor = new Cursor(Display.getCurrent(), SWT.CURSOR_HAND);
45 busyCursor = new Cursor(Display.getCurrent(), SWT.CURSOR_WAIT);
46 }
47
49 public void dispose() {
50 hyperlinkCursor.dispose();
51 busyCursor.dispose();
52 }
53
56 public Color getActiveBackground() {
57 return activeBackground;
58 }
59
62 public Color getActiveForeground() {
63 return activeForeground;
64 }
65
68 public Color getBackground() {
69 return background;
70 }
71
74 public Cursor getBusyCursor() {
75 return busyCursor;
76 }
77
80 public Color getForeground() {
81 return foreground;
82 }
83
86 public Cursor getHyperlinkCursor() {
87 return hyperlinkCursor;
88 }
89
92 public int getHyperlinkUnderlineMode() {
93 return hyperlinkUnderlineMode;
94 }
95
98 public Control getLastLink() {
99 return lastLink;
100 }
101
104 public boolean isHyperlinkCursorUsed() {
105 return hyperlinkCursorUsed;
106 }
107 public void mouseDoubleClick(MouseEvent e) {
108 }
109 public void mouseDown(MouseEvent e) {
110 if (e.button == 1)
111 return;
112 lastLink = (Control) e.widget;
113 }
114 public void mouseEnter(MouseEvent e) {
115 Control control = (Control) e.widget;
116
117 if (isHyperlinkCursorUsed())
118 control.setCursor(hyperlinkCursor);
119 if (activeBackground != null)
120 control.setBackground(activeBackground);
121 if (activeForeground != null)
122 control.setForeground(activeForeground);
123 if (hyperlinkUnderlineMode == UNDERLINE_ROLLOVER)
124 underline(control, true);
125 IHyperlinkListener action = getLinkListener(control);
126 if (action != null)
127 action.linkEntered(control);
128 }
129 public void mouseExit(MouseEvent e) {
130 Control control = (Control) e.widget;
131
132 if (isHyperlinkCursorUsed())
133 control.setCursor(null);
134 if (hyperlinkUnderlineMode == UNDERLINE_ROLLOVER)
135 underline(control, false);
136 if (background != null)
137 control.setBackground(background);
138 if (foreground != null)
139 control.setForeground(foreground);
140 IHyperlinkListener action = getLinkListener(control);
141 if (action != null)
142 action.linkExited(control);
143 }
144 public void mouseHover(MouseEvent e) {
145 }
146 public void mouseUp(MouseEvent e) {
147 if (e.button != 1)
148 return;
149 IHyperlinkListener action = getLinkListener((Control) e.widget);
150
151 if (action != null) {
152 Control c = (Control) e.widget;
153 c.setCursor(busyCursor);
154 action.linkActivated(c);
155 if (!c.isDisposed())
156 c.setCursor(isHyperlinkCursorUsed() ? hyperlinkCursor : null);
157 }
158 }
159 public void paintControl(PaintEvent e) {
160 Control control = (Control) e.widget;
161 if (hyperlinkUnderlineMode == UNDERLINE_ALWAYS)
162 HyperlinkHandler.underline(control, true);
163 }
164
170 public void registerHyperlink(Control control, IHyperlinkListener listener) {
171 if (background != null)
172 control.setBackground(background);
173 if (foreground != null)
174 control.setForeground(foreground);
175 control.addMouseListener(this);
176 control.addMouseTrackListener(this);
177 control.addListener(SWT.DefaultSelection, this);
178
179 if (hyperlinkUnderlineMode == UNDERLINE_ALWAYS)
180 control.addPaintListener(this);
181 hyperlinkListeners.put(control, listener);
182 removeDisposedLinks();
183 }
184 public IHyperlinkListener getLinkListener(Control c) {
185 if (c instanceof Label)
186 c = c.getParent();
187 return (IHyperlinkListener) hyperlinkListeners.get(c);
188 }
189
190 private void removeDisposedLinks() {
191 for (Enumeration keys = hyperlinkListeners.keys(); keys
192 .hasMoreElements();) {
193 Control control = (Control) keys.nextElement();
194 if (control.isDisposed()) {
195 hyperlinkListeners.remove(control);
196 }
197 }
198 }
199
201 public void reset() {
202 hyperlinkListeners.clear();
203 }
204
208 public void setActiveBackground(Color newActiveBackground) {
209 activeBackground = newActiveBackground;
210 }
211
215 public void setActiveForeground(Color newActiveForeground) {
216 activeForeground = newActiveForeground;
217 }
218
222 public void setBackground(Color newBackground) {
223 background = newBackground;
224 }
225
229 public void setForeground(Color newForeground) {
230 foreground = newForeground;
231 }
232
236 public void setHyperlinkCursorUsed(boolean newHyperlinkCursorUsed) {
237 hyperlinkCursorUsed = newHyperlinkCursorUsed;
238 }
239
243 public void setHyperlinkUnderlineMode(int newHyperlinkUnderlineMode) {
244 hyperlinkUnderlineMode = newHyperlinkUnderlineMode;
245 }
246
252 public static void underline(Control control, boolean inside) {
253
254 if (control instanceof HyperlinkLabel)
255 control = ((HyperlinkLabel) control).getLabel();
256
257 Composite parent = control.getParent();
258 Rectangle bounds = control.getBounds();
259 GC gc = new GC(parent);
260 Color color = inside ? control.getForeground() : control
261 .getBackground();
262 gc.setForeground(color);
263 int y = bounds.y + bounds.height;
264 gc.drawLine(bounds.x, y, bounds.x + bounds.width, y);
265 gc.dispose();
266 }
267
268
274 public void handleEvent(Event event) {
275 IHyperlinkListener listener = getLinkListener((Control) event.widget);
276 listener.linkActivated((Control) event.widget);
277 }
278 }
279 |
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