qabstractslider.cpp

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39 -

40 #include <qapplication.h> -

41 #include "qabstractslider.h" -

42 #include "qevent.h" -

43 #include "qabstractslider_p.h" -

44 #include "qdebug.h" -

45 #ifndef QT_NO_ACCESSIBILITY -

46 #include "qaccessible.h" -

47 #endif -

48 #include <limits.h> -

49 -

50 QT_BEGIN_NAMESPACE -

51 -

52 /*! -

53 \class QAbstractSlider -

54 \brief The QAbstractSlider class provides an integer value within a range. -

55 -

56 \ingroup abstractwidgets -

57 \inmodule QtWidgets -

58 -

59 The class is designed as a common super class for widgets like -

60 QScrollBar, QSlider and QDial. -

61 -

62 Here are the main properties of the class: -

63 -

64 \list 1 -

65 -

66 \li \l value: The bounded integer that QAbstractSlider maintains. -

67 -

68 \li \l minimum: The lowest possible value. -

69 -

70 \li \l maximum: The highest possible value. -

71 -

72 \li \l singleStep: The smaller of two natural steps that an -

73 abstract sliders provides and typically corresponds to the user -

74 pressing an arrow key. -

75 -

76 \li \l pageStep: The larger of two natural steps that an abstract -

77 slider provides and typically corresponds to the user pressing -

78 PageUp or PageDown. -

79 -

80 \li \l tracking: Whether slider tracking is enabled. -

81 -

82 \li \l sliderPosition: The current position of the slider. If \l -

83 tracking is enabled (the default), this is identical to \l value. -

84 -

85 \endlist -

86 -

87 Unity (1) may be viewed as a third step size. setValue() lets you -

88 set the current value to any integer in the allowed range, not -

89 just minimum() + \e n * singleStep() for integer values of \e n. -

90 Some widgets may allow the user to set any value at all; others -

91 may just provide multiples of singleStep() or pageStep(). -

92 -

93 QAbstractSlider emits a comprehensive set of signals: -

94 -

95 \table -

96 \header \li Signal \li Emitted when -

97 \row \li \l valueChanged() -

98 \li the value has changed. The \l tracking -

99 determines whether this signal is emitted during user -

100 interaction. -

101 \row \li \l sliderPressed() -

102 \li the user starts to drag the slider. -

103 \row \li \l sliderMoved() -

104 \li the user drags the slider. -

105 \row \li \l sliderReleased() -

106 \li the user releases the slider. -

107 \row \li \l actionTriggered() -

108 \li a slider action was triggerd. -

109 \row \li \l rangeChanged() -

110 \li a the range has changed. -

111 \endtable -

112 -

113 QAbstractSlider provides a virtual sliderChange() function that is -

114 well suited for updating the on-screen representation of -

115 sliders. By calling triggerAction(), subclasses trigger slider -

116 actions. Two helper functions QStyle::sliderPositionFromValue() and -

117 QStyle::sliderValueFromPosition() help subclasses and styles to map -

118 screen coordinates to logical range values. -

119 -

120 \sa QAbstractSpinBox, QSlider, QDial, QScrollBar, {Sliders Example} -

121 */ -

122 -

123 /*! -

124 \enum QAbstractSlider::SliderAction -

125 -

126 \value SliderNoAction -

127 \value SliderSingleStepAdd -

128 \value SliderSingleStepSub -

129 \value SliderPageStepAdd -

130 \value SliderPageStepSub -

131 \value SliderToMinimum -

132 \value SliderToMaximum -

133 \value SliderMove -

134 -

135 */ -

136 -

137 /*! -

138 \fn void QAbstractSlider::valueChanged(int value) -

139 -

140 This signal is emitted when the slider value has changed, with the -

141 new slider \a value as argument. -

142 */ -

143 -

144 /*! -

145 \fn void QAbstractSlider::sliderPressed() -

146 -

147 This signal is emitted when the user presses the slider with the -

148 mouse, or programmatically when setSliderDown(true) is called. -

149 -

150 \sa sliderReleased(), sliderMoved(), isSliderDown() -

151 */ -

152 -

153 /*! -

154 \fn void QAbstractSlider::sliderMoved(int value) -

155 -

156 This signal is emitted when sliderDown is true and the slider moves. This -

157 usually happens when the user is dragging the slider. The \a value -

158 is the new slider position. -

159 -

160 This signal is emitted even when tracking is turned off. -

161 -

162 \sa setTracking(), valueChanged(), isSliderDown(), -

163 sliderPressed(), sliderReleased() -

164 */ -

165 -

166 /*! -

167 \fn void QAbstractSlider::sliderReleased() -

168 -

169 This signal is emitted when the user releases the slider with the -

170 mouse, or programmatically when setSliderDown(false) is called. -

171 -

172 \sa sliderPressed(), sliderMoved(), sliderDown -

173 */ -

174 -

175 /*! -

176 \fn void QAbstractSlider::rangeChanged(int min, int max) -

177 -

178 This signal is emitted when the slider range has changed, with \a -

179 min being the new minimum, and \a max being the new maximum. -

180 -

181 \sa minimum, maximum -

182 */ -

183 -

184 /*! -

185 \fn void QAbstractSlider::actionTriggered(int action) -

186 -

187 This signal is emitted when the slider action \a action is -

188 triggered. Actions are \l SliderSingleStepAdd, \l -

189 SliderSingleStepSub, \l SliderPageStepAdd, \l SliderPageStepSub, -

190 \l SliderToMinimum, \l SliderToMaximum, and \l SliderMove. -

191 -

192 When the signal is emitted, the \l sliderPosition has been -

193 adjusted according to the action, but the \l value has not yet -

194 been propagated (meaning the valueChanged() signal was not yet -

195 emitted), and the visual display has not been updated. In slots -

196 connected to this signal you can thus safely adjust any action by -

197 calling setSliderPosition() yourself, based on both the action and -

198 the slider's value. -

199 -

200 \sa triggerAction() -

201 */ -

202 -

203 /*! -

204 \enum QAbstractSlider::SliderChange -

205 -

206 \value SliderRangeChange -

207 \value SliderOrientationChange -

208 \value SliderStepsChange -

209 \value SliderValueChange -

210 */ -

211 -

212 QAbstractSliderPrivate::QAbstractSliderPrivate() -

213 : minimum(0), maximum(99), pageStep(10), value(0), position(0), pressValue(-1), -

214 singleStep(1), singleStepFromItemView(-1), viewMayChangeSingleStep(true), offset_accumulated(0), tracking(true), -

215 blocktracking(false), pressed(false), -

216 invertedAppearance(false), invertedControls(false), -

217 orientation(Qt::Horizontal), repeatAction(QAbstractSlider::SliderNoAction) -

218 #ifdef QT_KEYPAD_NAVIGATION -

219 , isAutoRepeating(false) -

220 , repeatMultiplier(1) -

221 { -

222 firstRepeat.invalidate(); -

223 #else -

224 { -

225 #endif -

226 -

227

}

never executed: end of block

228 -

229 QAbstractSliderPrivate::~QAbstractSliderPrivate() -

230 { -

231 } -

232 -

233 /*! -

234 Sets the slider's minimum to \a min and its maximum to \a max. -

235 -

236 If \a max is smaller than \a min, \a min becomes the only legal -

237 value. -

238 -

239 \sa minimum, maximum -

240 */ -

241 void QAbstractSlider::setRange(int min, int max) -

242 { -

243 Q_D(QAbstractSlider); -

244 int oldMin = d->minimum; -

245 int oldMax = d->maximum; -

246 d->minimum = min; -

247 d->maximum = qMax(min, max); -

248 if (oldMin != d->minimum || oldMax != d->maximum) { -

249 sliderChange(SliderRangeChange); -

250 emit rangeChanged(d->minimum, d->maximum); -

251 setValue(d->value); // re-bound -

252 } -

253 } -

254 -

255 -

256 void QAbstractSliderPrivate::setSteps(int single, int page) -

257 { -

258 Q_Q(QAbstractSlider); -

259 singleStep = qAbs(single); -

260 pageStep = qAbs(page); -

261 q->sliderChange(QAbstractSlider::SliderStepsChange); -

262 } -

263 -

264 /*! -

265 Constructs an abstract slider. -

266 -

267 The \a parent argument is sent to the QWidget constructor. -

268 -

269 The \l minimum defaults to 0, the \l maximum to 99, with a \l -

270 singleStep size of 1 and a \l pageStep size of 10, and an initial -

271 \l value of 0. -

272 */ -

273 QAbstractSlider::QAbstractSlider(QWidget *parent) -

274 :QWidget(*new QAbstractSliderPrivate, parent, 0) -

275 { -

276 } -

277 -

278 /*! \internal */ -

279 QAbstractSlider::QAbstractSlider(QAbstractSliderPrivate &dd, QWidget *parent) -

280 :QWidget(dd, parent, 0) -

281 { -

282 } -

283 -

284 /*! -

285 Destroys the slider. -

286 */ -

287 QAbstractSlider::~QAbstractSlider() -

288 { -

289 } -

290 -

291 /*! -

292 \property QAbstractSlider::orientation -

293 \brief the orientation of the slider -

294 -

295 The orientation must be \l Qt::Vertical (the default) or \l -

296 Qt::Horizontal. -

297 */ -

298 void QAbstractSlider::setOrientation(Qt::Orientation orientation) -

299 { -

300 Q_D(QAbstractSlider); -

301 if (d->orientation == orientation) -

302 return; -

303 -

304 d->orientation = orientation; -

305 if (!testAttribute(Qt::WA_WState_OwnSizePolicy)) { -

306 QSizePolicy sp = sizePolicy(); -

307 sp.transpose(); -

308 setSizePolicy(sp); -

309 setAttribute(Qt::WA_WState_OwnSizePolicy, false); -

310 } -

311 update(); -

312 updateGeometry(); -

313 } -

314 -

315 Qt::Orientation QAbstractSlider::orientation() const -

316 { -

317 Q_D(const QAbstractSlider); -

318 return d->orientation; -

319 } -

320 -

321 -

322 /*! -

323 \property QAbstractSlider::minimum -

324 \brief the sliders's minimum value -

325 -

326 When setting this property, the \l maximum is adjusted if -

327 necessary to ensure that the range remains valid. Also the -

328 slider's current value is adjusted to be within the new range. -

329 -

330 */ -

331 -

332 void QAbstractSlider::setMinimum(int min) -

333 { -

334 Q_D(QAbstractSlider); -

335 setRange(min, qMax(d->maximum, min)); -

336 } -

337 -

338 int QAbstractSlider::minimum() const -

339 { -

340 Q_D(const QAbstractSlider); -

341 return d->minimum; -

342 } -

343 -

344 -

345 /*! -

346 \property QAbstractSlider::maximum -

347 \brief the slider's maximum value -

348 -

349 When setting this property, the \l minimum is adjusted if -

350 necessary to ensure that the range remains valid. Also the -

351 slider's current value is adjusted to be within the new range. -

352 -

353 -

354 */ -

355 -

356 void QAbstractSlider::setMaximum(int max) -

357 { -

358 Q_D(QAbstractSlider); -

359 setRange(qMin(d->minimum, max), max); -

360 } -

361 -

362 int QAbstractSlider::maximum() const -

363 { -

364 Q_D(const QAbstractSlider); -

365 return d->maximum; -

366 } -

367 -

368 -

369 -

370 /*! -

371 \property QAbstractSlider::singleStep -

372 \brief the single step. -

373 -

374 The smaller of two natural steps that an -

375 abstract sliders provides and typically corresponds to the user -

376 pressing an arrow key. -

377 -

378 If the property is modified during an auto repeating key event, behavior -

379 is undefined. -

380 -

381 \sa pageStep -

382 */ -

383 -

384 void QAbstractSlider::setSingleStep(int step) -

385 { -

386 Q_D(QAbstractSlider); -

387 -

388 d->viewMayChangeSingleStep = (step < 0); -

389

if (step < 0 && d->singleStepFromItemView > 0)

step < 0	Description
TRUE	never evaluated
FALSE	never evaluated

d->singleStepFromItemView > 0	Description
TRUE	never evaluated
FALSE	never evaluated

390

step = d->singleStepFromItemView;

never executed: step = d->singleStepFromItemView;

391 -

392

if (step != d->singleStep)

step != d->singleStep	Description
TRUE	never evaluated
FALSE	never evaluated

393

d->setSteps(step, d->pageStep);

never executed: d->setSteps(step, d->pageStep);

394

}

never executed: end of block

395 -

396 int QAbstractSlider::singleStep() const -

397 { -

398 Q_D(const QAbstractSlider); -

399 return d->singleStep; -

400 } -

401 -

402 -

403 /*! -

404 \property QAbstractSlider::pageStep -

405 \brief the page step. -

406 -

407 The larger of two natural steps that an abstract slider provides -

408 and typically corresponds to the user pressing PageUp or PageDown. -

409 -

410 \sa singleStep -

411 */ -

412 -

413 void QAbstractSlider::setPageStep(int step) -

414 { -

415 Q_D(QAbstractSlider); -

416 if (step != d->pageStep) -

417 d->setSteps(d->singleStep, step); -

418 } -

419 -

420 int QAbstractSlider::pageStep() const -

421 { -

422 Q_D(const QAbstractSlider); -

423 return d->pageStep; -

424 } -

425 -

426 /*! -

427 \property QAbstractSlider::tracking -

428 \brief whether slider tracking is enabled -

429 -

430 If tracking is enabled (the default), the slider emits the -

431 valueChanged() signal while the slider is being dragged. If -

432 tracking is disabled, the slider emits the valueChanged() signal -

433 only when the user releases the slider. -

434 -

435 \sa sliderDown -

436 */ -

437 void QAbstractSlider::setTracking(bool enable) -

438 { -

439 Q_D(QAbstractSlider); -

440 d->tracking = enable; -

441 } -

442 -

443 bool QAbstractSlider::hasTracking() const -

444 { -

445 Q_D(const QAbstractSlider); -

446 return d->tracking; -

447 } -

448 -

449 -

450 /*! -

451 \property QAbstractSlider::sliderDown -

452 \brief whether the slider is pressed down. -

453 -

454 The property is set by subclasses in order to let the abstract -

455 slider know whether or not \l tracking has any effect. -

456 -

457 Changing the slider down property emits the sliderPressed() and -

458 sliderReleased() signals. -

459 -

460 */ -

461 void QAbstractSlider::setSliderDown(bool down) -

462 { -

463 Q_D(QAbstractSlider); -

464 bool doEmit = d->pressed != down; -

465 -

466 d->pressed = down; -

467 -

468 if (doEmit) { -

469 if (down) -

470 emit sliderPressed(); -

471 else -

472 emit sliderReleased(); -

473 } -

474 -

475 if (!down && d->position != d->value) -

476 triggerAction(SliderMove); -

477 } -

478 -

479 bool QAbstractSlider::isSliderDown() const -

480 { -

481 Q_D(const QAbstractSlider); -

482 return d->pressed; -

483 } -

484 -

485 -

486 /*! -

487 \property QAbstractSlider::sliderPosition -

488 \brief the current slider position -

489 -

490 If \l tracking is enabled (the default), this is identical to \l value. -

491 */ -

492 void QAbstractSlider::setSliderPosition(int position) -

493 { -

494 Q_D(QAbstractSlider); -

495 position = d->bound(position); -

496 if (position == d->position) -

497 return; -

498 d->position = position; -

499 if (!d->tracking) -

500 update(); -

501 if (d->pressed) -

502 emit sliderMoved(position); -

503 if (d->tracking && !d->blocktracking) -

504 triggerAction(SliderMove); -

505 } -

506 -

507 int QAbstractSlider::sliderPosition() const -

508 { -

509 Q_D(const QAbstractSlider); -

510 return d->position; -

511 } -

512 -

513 -

514 /*! -

515 \property QAbstractSlider::value -

516 \brief the slider's current value -

517 -

518 The slider forces the value to be within the legal range: \l -

519 minimum <= \c value <= \l maximum. -

520 -

521 Changing the value also changes the \l sliderPosition. -

522 */ -

523 -

524 -

525 int QAbstractSlider::value() const -

526 { -

527 Q_D(const QAbstractSlider); -

528 return d->value; -

529 } -

530 -

531 void QAbstractSlider::setValue(int value) -

532 { -

533 Q_D(QAbstractSlider); -

534 value = d->bound(value); -

535 if (d->value == value && d->position == value) -

536 return; -

537 d->value = value; -

538 if (d->position != value) { -

539 d->position = value; -

540 if (d->pressed) -

541 emit sliderMoved((d->position = value)); -

542 } -

543 #ifndef QT_NO_ACCESSIBILITY -

544 QAccessibleValueChangeEvent event(this, d->value); -

545 QAccessible::updateAccessibility(&event); -

546 #endif -

547 sliderChange(SliderValueChange); -

548 emit valueChanged(value); -

549 } -

550 -

551 /*! -

552 \property QAbstractSlider::invertedAppearance -

553 \brief whether or not a slider shows its values inverted. -

554 -

555 If this property is \c false (the default), the minimum and maximum will -

556 be shown in its classic position for the inherited widget. If the -

557 value is true, the minimum and maximum appear at their opposite location. -

558 -

559 Note: This property makes most sense for sliders and dials. For -

560 scroll bars, the visual effect of the scroll bar subcontrols depends on -

561 whether or not the styles understand inverted appearance; most styles -

562 ignore this property for scroll bars. -

563 */ -

564 -

565 bool QAbstractSlider::invertedAppearance() const -

566 { -

567 Q_D(const QAbstractSlider); -

568 return d->invertedAppearance; -

569 } -

570 -

571 void QAbstractSlider::setInvertedAppearance(bool invert) -

572 { -

573 Q_D(QAbstractSlider); -

574 d->invertedAppearance = invert; -

575 update(); -

576 } -

577 -

578 -

579 /*! -

580 \property QAbstractSlider::invertedControls -

581 \brief whether or not the slider inverts its wheel and key events. -

582 -

583 If this property is \c false, scrolling the mouse wheel "up" and using keys -

584 like page up will increase the slider's value towards its maximum. Otherwise -

585 pressing page up will move value towards the slider's minimum. -

586 */ -

587 -

588 -

589 bool QAbstractSlider::invertedControls() const -

590 { -

591 Q_D(const QAbstractSlider); -

592 return d->invertedControls; -

593 } -

594 -

595 void QAbstractSlider::setInvertedControls(bool invert) -

596 { -

597 Q_D(QAbstractSlider); -

598 d->invertedControls = invert; -

599 } -

600 -

601 /*! Triggers a slider \a action. Possible actions are \l -

602 SliderSingleStepAdd, \l SliderSingleStepSub, \l SliderPageStepAdd, -

603 \l SliderPageStepSub, \l SliderToMinimum, \l SliderToMaximum, and \l -

604 SliderMove. -

605 -

606 \sa actionTriggered() -

607 */ -

608 void QAbstractSlider::triggerAction(SliderAction action) -

609 { -

610 Q_D(QAbstractSlider); -

611 d->blocktracking = true; -

612 switch (action) { -

613 case SliderSingleStepAdd: -

614 setSliderPosition(d->overflowSafeAdd(d->effectiveSingleStep())); -

615 break; -

616 case SliderSingleStepSub: -

617 setSliderPosition(d->overflowSafeAdd(-d->effectiveSingleStep())); -

618 break; -

619 case SliderPageStepAdd: -

620 setSliderPosition(d->overflowSafeAdd(d->pageStep)); -

621 break; -

622 case SliderPageStepSub: -

623 setSliderPosition(d->overflowSafeAdd(-d->pageStep)); -

624 break; -

625 case SliderToMinimum: -

626 setSliderPosition(d->minimum); -

627 break; -

628 case SliderToMaximum: -

629 setSliderPosition(d->maximum); -

630 break; -

631 case SliderMove: -

632 case SliderNoAction: -

633 break; -

634 }; -

635 emit actionTriggered(action); -

636 d->blocktracking = false; -

637 setValue(d->position); -

638 } -

639 -

640 /*! Sets action \a action to be triggered repetitively in intervals -

641 of \a repeatTime, after an initial delay of \a thresholdTime. -

642 -

643 \sa triggerAction(), repeatAction() -

644 */ -

645 void QAbstractSlider::setRepeatAction(SliderAction action, int thresholdTime, int repeatTime) -

646 { -

647 Q_D(QAbstractSlider); -

648 if ((d->repeatAction = action) == SliderNoAction) { -

649 d->repeatActionTimer.stop(); -

650 } else { -

651 d->repeatActionTime = repeatTime; -

652 d->repeatActionTimer.start(thresholdTime, this); -

653 } -

654 } -

655 -

656 /*! -

657 Returns the current repeat action. -

658 \sa setRepeatAction() -

659 */ -

660 QAbstractSlider::SliderAction QAbstractSlider::repeatAction() const -

661 { -

662 Q_D(const QAbstractSlider); -

663 return d->repeatAction; -

664 } -

665 -

666 /*!\reimp -

667 */ -

668 void QAbstractSlider::timerEvent(QTimerEvent *e) -

669 { -

670 Q_D(QAbstractSlider); -

671 if (e->timerId() == d->repeatActionTimer.timerId()) { -

672 if (d->repeatActionTime) { // was threshold time, use repeat time next time -

673 d->repeatActionTimer.start(d->repeatActionTime, this); -

674 d->repeatActionTime = 0; -

675 } -

676 if (d->repeatAction == SliderPageStepAdd) -

677 d->setAdjustedSliderPosition(d->overflowSafeAdd(d->pageStep)); -

678 else if (d->repeatAction == SliderPageStepSub) -

679 d->setAdjustedSliderPosition(d->overflowSafeAdd(-d->pageStep)); -

680 else -

681 triggerAction(d->repeatAction); -

682 } -

683 } -

684 -

685 /*! -

686 Reimplement this virtual function to track slider changes such as -

687 \l SliderRangeChange, \l SliderOrientationChange, \l -

688 SliderStepsChange, or \l SliderValueChange. The default -

689 implementation only updates the display and ignores the \a change -

690 parameter. -

691 */ -

692 void QAbstractSlider::sliderChange(SliderChange) -

693 { -

694 update(); -

695 } -

696 -

697 bool QAbstractSliderPrivate::scrollByDelta(Qt::Orientation orientation, Qt::KeyboardModifiers modifiers, int delta) -

698 { -

699 Q_Q(QAbstractSlider); -

700 int stepsToScroll = 0; -

701 // in Qt scrolling to the right gives negative values. -

702 if (orientation == Qt::Horizontal) -

703 delta = -delta; -

704 qreal offset = qreal(delta) / 120; -

705 -

706 if ((modifiers & Qt::ControlModifier) || (modifiers & Qt::ShiftModifier)) { -

707 // Scroll one page regardless of delta: -

708 stepsToScroll = qBound(-pageStep, int(offset * pageStep), pageStep); -

709 offset_accumulated = 0; -

710 } else { -

711 // Calculate how many lines to scroll. Depending on what delta is (and -

712 // offset), we might end up with a fraction (e.g. scroll 1.3 lines). We can -

713 // only scroll whole lines, so we keep the reminder until next event. -

714 qreal stepsToScrollF = -

715 #ifndef QT_NO_WHEELEVENT -

716 QApplication::wheelScrollLines() * -

717 #endif -

718 offset * effectiveSingleStep(); -

719 // Check if wheel changed direction since last event: -

720 if (offset_accumulated != 0 && (offset / offset_accumulated) < 0) -

721 offset_accumulated = 0; -

722 -

723 offset_accumulated += stepsToScrollF; -

724 #ifndef Q_DEAD_CODE_FROM_QT4_MAC -

725 // Don't scroll more than one page in any case: -

726 stepsToScroll = qBound(-pageStep, int(offset_accumulated), pageStep); -

727 #else -

728 // Native UI-elements on Mac can scroll hundreds of lines at a time as -

729 // a result of acceleration. So keep the same behaviour in Qt, and -

730 // don't restrict stepsToScroll to certain maximum (pageStep): -

731 stepsToScroll = int(offset_accumulated); -

732 #endif -

733 offset_accumulated -= int(offset_accumulated); -

734 if (stepsToScroll == 0) { -

735 // We moved less than a line, but might still have accumulated partial scroll, -

736 // unless we already are at one of the ends. -

737 const float effective_offset = invertedControls ? -offset_accumulated : offset_accumulated; -

738 if (effective_offset > 0.f && value < maximum) -

739 return true; -

740 if (effective_offset < 0.f && value > minimum) -

741 return true; -

742 offset_accumulated = 0; -

743 return false; -

744 } -

745 } -

746 -

747 if (invertedControls) -

748 stepsToScroll = -stepsToScroll; -

749 -

750 int prevValue = value; -

751 position = bound(overflowSafeAdd(stepsToScroll)); // value will be updated by triggerAction() -

752 q->triggerAction(QAbstractSlider::SliderMove); -

753 -

754 if (prevValue == value) { -

755 offset_accumulated = 0; -

756 return false; -

757 } -

758 return true; -

759 } -

760 -

761 /*! -

762 \reimp -

763 */ -

764 #ifndef QT_NO_WHEELEVENT -

765 void QAbstractSlider::wheelEvent(QWheelEvent * e) -

766 { -

767 Q_D(QAbstractSlider); -

768 e->ignore(); -

769 int delta = e->delta(); -

770

if (e->inverted())

e->inverted()	Description
TRUE	never evaluated
FALSE	never evaluated

771

delta = -delta;

never executed: delta = -delta;

772

if (d->scrollByDelta(e->orientation(), e->modifiers(), delta))

d->scrollByDel...iers(), delta)	Description
TRUE	never evaluated
FALSE	never evaluated

773

e->accept();

never executed: e->accept();

774

}

never executed: end of block

775 -

776 #endif -

777 -

778 /*! -

779 \reimp -

780 */ -

781 void QAbstractSlider::keyPressEvent(QKeyEvent *ev) -

782 { -

783 Q_D(QAbstractSlider); -

784 SliderAction action = SliderNoAction; -

785 #ifdef QT_KEYPAD_NAVIGATION -

786 if (ev->isAutoRepeat()) { -

787 if (!d->firstRepeat.isValid()) -

788 d->firstRepeat.start(); -

789 else if (1 == d->repeatMultiplier) { -

790 // This is the interval in milli seconds which one key repetition -

791 // takes. -

792 const int repeatMSecs = d->firstRepeat.elapsed(); -

793 -

794 /** -

795 * The time it takes to currently navigate the whole slider. -

796 */ -

797 const qreal currentTimeElapse = (qreal(maximum()) / singleStep()) * repeatMSecs; -

798 -

799 /** -

800 * This is an arbitrarily determined constant in msecs that -

801 * specifies how long time it should take to navigate from the -

802 * start to the end(excluding starting key auto repeat). -

803 */ -

804 const int SliderRepeatElapse = 2500; -

805 -

806 d->repeatMultiplier = currentTimeElapse / SliderRepeatElapse; -

807 } -

808 -

809 } -

810 else if (d->firstRepeat.isValid()) { -

811 d->firstRepeat.invalidate(); -

812 d->repeatMultiplier = 1; -

813 } -

814 -

815 #endif -

816 -

817 switch (ev->key()) { -

818 #ifdef QT_KEYPAD_NAVIGATION -

819 case Qt::Key_Select: -

820 if (QApplication::keypadNavigationEnabled()) -

821 setEditFocus(!hasEditFocus()); -

822 else -

823 ev->ignore(); -

824 break; -

825 case Qt::Key_Back: -

826 if (QApplication::keypadNavigationEnabled() && hasEditFocus()) { -

827 setValue(d->origValue); -

828 setEditFocus(false); -

829 } else -

830 ev->ignore(); -

831 break; -

832 #endif -

833 -

834 // It seems we need to use invertedAppearance for Left and right, otherwise, things look weird. -

835 case Qt::Key_Left: -

836 #ifdef QT_KEYPAD_NAVIGATION -

837 // In QApplication::KeypadNavigationDirectional, we want to change the slider -

838 // value if there is no left/right navigation possible and if this slider is not -

839 // inside a tab widget. -

840 if (QApplication::keypadNavigationEnabled() -

841 && (!hasEditFocus() && QApplication::navigationMode() == Qt::NavigationModeKeypadTabOrder -

842 || d->orientation == Qt::Vertical -

843 || !hasEditFocus() -

844 && (QWidgetPrivate::canKeypadNavigate(Qt::Horizontal) || QWidgetPrivate::inTabWidget(this)))) { -

845 ev->ignore(); -

846 return; -

847 } -

848 if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical) -

849 action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd; -

850 else -

851 #endif -

852 if (isRightToLeft()) -

853 action = d->invertedAppearance ? SliderSingleStepSub : SliderSingleStepAdd; -

854 else -

855 action = !d->invertedAppearance ? SliderSingleStepSub : SliderSingleStepAdd; -

856 break; -

857 case Qt::Key_Right: -

858 #ifdef QT_KEYPAD_NAVIGATION -

859 // Same logic as in Qt::Key_Left -

860 if (QApplication::keypadNavigationEnabled() -

861 && (!hasEditFocus() && QApplication::navigationMode() == Qt::NavigationModeKeypadTabOrder -

862 || d->orientation == Qt::Vertical -

863 || !hasEditFocus() -

864 && (QWidgetPrivate::canKeypadNavigate(Qt::Horizontal) || QWidgetPrivate::inTabWidget(this)))) { -

865 ev->ignore(); -

866 return; -

867 } -

868 if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical) -

869 action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub; -

870 else -

871 #endif -

872 if (isRightToLeft()) -

873 action = d->invertedAppearance ? SliderSingleStepAdd : SliderSingleStepSub; -

874 else -

875 action = !d->invertedAppearance ? SliderSingleStepAdd : SliderSingleStepSub; -

876 break; -

877 case Qt::Key_Up: -

878 #ifdef QT_KEYPAD_NAVIGATION -

879 // In QApplication::KeypadNavigationDirectional, we want to change the slider -

880 // value if there is no up/down navigation possible. -

881 if (QApplication::keypadNavigationEnabled() -

882 && (QApplication::navigationMode() == Qt::NavigationModeKeypadTabOrder -

883 || d->orientation == Qt::Horizontal -

884 || !hasEditFocus() && QWidgetPrivate::canKeypadNavigate(Qt::Vertical))) { -

885 ev->ignore(); -

886 break; -

887 } -

888 #endif -

889 action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd; -

890 break; -

891 case Qt::Key_Down: -

892 #ifdef QT_KEYPAD_NAVIGATION -

893 // Same logic as in Qt::Key_Up -

894 if (QApplication::keypadNavigationEnabled() -

895 && (QApplication::navigationMode() == Qt::NavigationModeKeypadTabOrder -

896 || d->orientation == Qt::Horizontal -

897 || !hasEditFocus() && QWidgetPrivate::canKeypadNavigate(Qt::Vertical))) { -

898 ev->ignore(); -

899 break; -

900 } -

901 #endif -

902 action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub; -

903 break; -

904 case Qt::Key_PageUp: -

905 action = d->invertedControls ? SliderPageStepSub : SliderPageStepAdd; -

906 break; -

907 case Qt::Key_PageDown: -

908 action = d->invertedControls ? SliderPageStepAdd : SliderPageStepSub; -

909 break; -

910 case Qt::Key_Home: -

911 action = SliderToMinimum; -

912 break; -

913 case Qt::Key_End: -

914 action = SliderToMaximum; -

915 break; -

916 default: -

917 ev->ignore(); -

918 break; -

919 } -

920 if (action) -

921 triggerAction(action); -

922 } -

923 -

924 /*! -

925 \reimp -

926 */ -

927 void QAbstractSlider::changeEvent(QEvent *ev) -

928 { -

929 Q_D(QAbstractSlider); -

930 switch (ev->type()) { -

931 case QEvent::EnabledChange: -

932 if (!isEnabled()) { -

933 d->repeatActionTimer.stop(); -

934 setSliderDown(false); -

935 } -

936 // fall through... -

937 default: -

938 QWidget::changeEvent(ev); -

939 } -

940 } -

941 -

942 /*! -

943 \reimp -

944 */ -

945 bool QAbstractSlider::event(QEvent *e) -

946 { -

947 #ifdef QT_KEYPAD_NAVIGATION -

948 Q_D(QAbstractSlider); -

949 switch (e->type()) { -

950 case QEvent::FocusIn: -

951 d->origValue = d->value; -

952 break; -

953 default: -

954 break; -

955 } -

956 #endif -

957 -

958 return QWidget::event(e); -

959 } -

960 -

961 // This function is called from itemviews when doing scroll per pixel (on updateGeometries()) -

962 // It will not have any effect if there has been a call to setSingleStep with -

963 // a 'reasonable' value (since viewMayChangeSingleStep will be set to false). -

964 // (If setSingleStep is called with -1 it will however allow the views to change singleStep.) -

965 -

966 void QAbstractSliderPrivate::itemviewChangeSingleStep(int step) -

967 { -

968 singleStepFromItemView = step; -

969

if (viewMayChangeSingleStep && singleStep != step)

viewMayChangeSingleStep	Description
TRUE	never evaluated
FALSE	never evaluated

singleStep != step	Description
TRUE	never evaluated
FALSE	never evaluated

970

setSteps(step, pageStep

never executed: setSteps(step, pageStep);

);

never executed: setSteps(step, pageStep);

971

}

never executed: end of block

972 -

973 QT_END_NAMESPACE -

974 -

975 #include "moc_qabstractslider.cpp" -

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