283 */
284 private static native void initIDs();
285
286 static {
287 /* ensure that the necessary native libraries are loaded */
288 Toolkit.loadLibraries();
289 if (!GraphicsEnvironment.isHeadless()) {
290 initIDs();
291 }
292 }
293
294 /**
295 * Constructs a new vertical scroll bar.
296 * The default properties of the scroll bar are listed in
297 * the following table:
298 *
299 * <table class="striped">
300 * <caption>Scrollbar default properties</caption>
301 * <thead>
302 * <tr>
303 * <th>Property</th>
304 * <th>Description</th>
305 * <th>Default Value</th>
306 * </tr>
307 * </thead>
308 * <tbody>
309 * <tr>
310 * <td>orientation</td>
311 * <td>indicates whether the scroll bar is vertical
312 * <br>or horizontal</td>
313 * <td>{@code Scrollbar.VERTICAL}</td>
314 * </tr>
315 * <tr>
316 * <td>value</td>
317 * <td>value which controls the location
318 * <br>of the scroll bar's bubble</td>
319 * <td>0</td>
320 * </tr>
321 * <tr>
322 * <td>visible amount</td>
323 * <td>visible amount of the scroll bar's range,
324 * <br>typically represented by the size of the
325 * <br>scroll bar's bubble</td>
326 * <td>10</td>
327 * </tr>
328 * <tr>
329 * <td>minimum</td>
330 * <td>minimum value of the scroll bar</td>
331 * <td>0</td>
332 * </tr>
333 * <tr>
334 * <td>maximum</td>
335 * <td>maximum value of the scroll bar</td>
336 * <td>100</td>
337 * </tr>
338 * <tr>
339 * <td>unit increment</td>
340 * <td>amount the value changes when the
341 * <br>Line Up or Line Down key is pressed,
342 * <br>or when the end arrows of the scrollbar
343 * <br>are clicked </td>
344 * <td>1</td>
345 * </tr>
346 * <tr>
347 * <td>block increment</td>
348 * <td>amount the value changes when the
349 * <br>Page Up or Page Down key is pressed,
350 * <br>or when the scrollbar track is clicked
351 * <br>on either side of the bubble </td>
352 * <td>10</td>
353 * </tr>
354 * </tbody>
355 * </table>
356 *
357 * @exception HeadlessException if GraphicsEnvironment.isHeadless()
358 * returns true.
359 * @see java.awt.GraphicsEnvironment#isHeadless
360 */
361 public Scrollbar() throws HeadlessException {
362 this(VERTICAL, 0, 10, 0, 100);
363 }
364
365 /**
366 * Constructs a new scroll bar with the specified orientation.
367 * <p>
368 * The {@code orientation} argument must take one of the two
369 * values {@code Scrollbar.HORIZONTAL},
370 * or {@code Scrollbar.VERTICAL},
371 * indicating a horizontal or vertical scroll bar, respectively.
372 *
373 * @param orientation indicates the orientation of the scroll bar
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283 */
284 private static native void initIDs();
285
286 static {
287 /* ensure that the necessary native libraries are loaded */
288 Toolkit.loadLibraries();
289 if (!GraphicsEnvironment.isHeadless()) {
290 initIDs();
291 }
292 }
293
294 /**
295 * Constructs a new vertical scroll bar.
296 * The default properties of the scroll bar are listed in
297 * the following table:
298 *
299 * <table class="striped">
300 * <caption>Scrollbar default properties</caption>
301 * <thead>
302 * <tr>
303 * <th scope="col">Property
304 * <th scope="col">Description
305 * <th scope="col">Default Value
306 * </thead>
307 * <tbody>
308 * <tr>
309 * <th scope="row">orientation
310 * <td>indicates whether the scroll bar is vertical or horizontal
311 * <td>{@code Scrollbar.VERTICAL}
312 * <tr>
313 * <th scope="row">value
314 * <td>value which controls the location of the scroll bar's bubble
315 * <td>0
316 * <tr>
317 * <th scope="row">visible amount
318 * <td>visible amount of the scroll bar's range, typically represented
319 * by the size of the scroll bar's bubble
320 * <td>10
321 * <tr>
322 * <th scope="row">minimum
323 * <td>minimum value of the scroll bar
324 * <td>0
325 * <tr>
326 * <th scope="row">maximum
327 * <td>maximum value of the scroll bar
328 * <td>100
329 * <tr>
330 * <th scope="row">unit increment
331 * <td>amount the value changes when the Line Up or Line Down key is
332 * pressed, or when the end arrows of the scrollbar are clicked
333 * <td>1
334 * <tr>
335 * <th scope="row">block increment
336 * <td>amount the value changes when the Page Up or Page Down key is
337 * pressed, or when the scrollbar track is clicked<br>on either side of
338 * the bubble
339 * <td>10
340 * </tbody>
341 * </table>
342 *
343 * @exception HeadlessException if GraphicsEnvironment.isHeadless()
344 * returns true.
345 * @see java.awt.GraphicsEnvironment#isHeadless
346 */
347 public Scrollbar() throws HeadlessException {
348 this(VERTICAL, 0, 10, 0, 100);
349 }
350
351 /**
352 * Constructs a new scroll bar with the specified orientation.
353 * <p>
354 * The {@code orientation} argument must take one of the two
355 * values {@code Scrollbar.HORIZONTAL},
356 * or {@code Scrollbar.VERTICAL},
357 * indicating a horizontal or vertical scroll bar, respectively.
358 *
359 * @param orientation indicates the orientation of the scroll bar
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