qgraphicslinearlayout.cpp

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38 ****************************************************************************/ -

39 -

40 /*! -

41 \class QGraphicsLinearLayout -

42 \brief The QGraphicsLinearLayout class provides a horizontal or vertical -

43 layout for managing widgets in Graphics View. -

44 \since 4.4 -

45 \ingroup graphicsview-api -

46 \inmodule QtWidgets -

47 -

48 The default orientation for a linear layout is Qt::Horizontal. You can -

49 choose a vertical orientation either by calling setOrientation(), or by -

50 passing Qt::Vertical to QGraphicsLinearLayout's constructor. -

51 -

52 The most common way to use QGraphicsLinearLayout is to construct an object -

53 on the heap with no parent, add widgets and layouts by calling addItem(), -

54 and finally assign the layout to a widget by calling -

55 QGraphicsWidget::setLayout(). -

56 -

57 \snippet code/src_gui_graphicsview_qgraphicslinearlayout.cpp 0 -

58 -

59 You can add widgets, layouts, stretches (addStretch(), insertStretch() or -

60 setStretchFactor()), and spacings (setItemSpacing()) to a linear -

61 layout. The layout takes ownership of the items. In some cases when the layout -

62 item also inherits from QGraphicsItem (such as QGraphicsWidget) there will be a -

63 ambiguity in ownership because the layout item belongs to two ownership hierarchies. -

64 See the documentation of QGraphicsLayoutItem::setOwnedByLayout() how to handle -

65 this. -

66 You can access each item in the layout by calling count() and itemAt(). Calling -

67 removeAt() or removeItem() will remove an item from the layout, without -

68 destroying it. -

69 -

70 \section1 Size Hints and Size Policies in QGraphicsLinearLayout -

71 -

72 QGraphicsLinearLayout respects each item's size hints and size policies, -

73 and when the layout contains more space than the items can fill, each item -

74 is arranged according to the layout's alignment for that item. You can set -

75 an alignment for each item by calling setAlignment(), and check the -

76 alignment for any item by calling alignment(). By default, items are -

77 aligned to the top left. -

78 -

79 \section1 Spacing within QGraphicsLinearLayout -

80 -

81 Between the items, the layout distributes some space. The actual amount of -

82 space depends on the managed widget's current style, but the common -

83 spacing is 4. You can also set your own spacing by calling setSpacing(), -

84 and get the current spacing value by calling spacing(). If you want to -

85 configure individual spacing for your items, you can call setItemSpacing(). -

86 -

87 \section1 Stretch Factor in QGraphicsLinearLayout -

88 -

89 You can assign a stretch factor to each item to control how much space it -

90 will get compared to the other items. By default, two identical widgets -

91 arranged in a linear layout will have the same size, but if the first -

92 widget has a stretch factor of 1 and the second widget has a stretch -

93 factor of 2, the first widget will get 1/3 of the available space, and the -

94 second will get 2/3. -

95 -

96 QGraphicsLinearLayout calculates the distribution of sizes by adding up -

97 the stretch factors of all items, and then dividing the available space -

98 accordingly. The default stretch factor is 0 for all items; a factor of 0 -

99 means the item does not have any defined stretch factor; effectively this -

100 is the same as setting the stretch factor to 1. The stretch factor only -

101 applies to the available space in the lengthwise direction of the layout -

102 (following its orientation). If you want to control both the item's -

103 horizontal and vertical stretch, you can use QGraphicsGridLayout instead. -

104 -

105 \section1 QGraphicsLinearLayout Compared to Other Layouts -

106 -

107 QGraphicsLinearLayout is very similar to QVBoxLayout and QHBoxLayout, but -

108 in contrast to these classes, it is used to manage QGraphicsWidget and -

109 QGraphicsLayout instead of QWidget and QLayout. -

110 -

111 \sa QGraphicsGridLayout, QGraphicsWidget -

112 */ -

113 -

114 #include "qapplication.h" -

115 -

116 #ifndef QT_NO_GRAPHICSVIEW -

117 -

118 #include "qwidget.h" -

119 #include "qgraphicslayout_p.h" -

120 #include "qgraphicslayoutitem.h" -

121 #include "qgraphicslinearlayout.h" -

122 #include "qgraphicswidget.h" -

123 #include "qgraphicsgridlayoutengine_p.h" -

124 #include "qgraphicslayoutstyleinfo_p.h" -

125 #include "qscopedpointer.h" -

126 #ifdef QT_DEBUG -

127 #include <QtCore/qdebug.h> -

128 #endif -

129 -

130 QT_BEGIN_NAMESPACE -

131 -

132 class QGraphicsLinearLayoutPrivate : public QGraphicsLayoutPrivate -

133 { -

134 public: -

135 QGraphicsLinearLayoutPrivate(Qt::Orientation orientation) -

136 : orientation(orientation) -

137

{ }

never executed: end of block

138 -

139 void removeGridItem(QGridLayoutItem *gridItem); -

140 QGraphicsLayoutStyleInfo *styleInfo() const; -

141 void fixIndex(int *index) const; -

142 int gridRow(int index) const; -

143 int gridColumn(int index) const; -

144 -

145 Qt::Orientation orientation; -

146 mutable QScopedPointer<QGraphicsLayoutStyleInfo> m_styleInfo; -

147 QGraphicsGridLayoutEngine engine; -

148 }; -

149 -

150 void QGraphicsLinearLayoutPrivate::removeGridItem(QGridLayoutItem *gridItem) -

151 { -

152 int index = gridItem->firstRow(orientation); -

153 engine.removeItem(gridItem); -

154 engine.removeRows(index, 1, orientation); -

155

}

never executed: end of block

156 -

157 void QGraphicsLinearLayoutPrivate::fixIndex(int *index) const -

158 { -

159 int count = engine.rowCount(orientation); -

160

if (uint(*index) > uint(count))

uint(*index) > uint(count)	Description
TRUE	never evaluated
FALSE	never evaluated

161

*index = count;

never executed: *index = count;

162

}

never executed: end of block

163 -

164 int QGraphicsLinearLayoutPrivate::gridRow(int index) const -

165 { -

166

if (orientation == Qt::Horizontal)

orientation == Qt::Horizontal	Description
TRUE	never evaluated
FALSE	never evaluated

167

return 0;

never executed: return 0;

168

return int(qMin(uint(index), uint(engine.rowCount())));

never executed: return int(qMin(uint(index), uint(engine.rowCount())));

169 } -

170 -

171 int QGraphicsLinearLayoutPrivate::gridColumn(int index) const -

172 { -

173

if (orientation == Qt::Vertical)

orientation == Qt::Vertical	Description
TRUE	never evaluated
FALSE	never evaluated

174

return 0;

never executed: return 0;

175

return int(qMin(uint(index), uint(engine.columnCount())));

never executed: return int(qMin(uint(index), uint(engine.columnCount())));

176 } -

177 -

178 QGraphicsLayoutStyleInfo *QGraphicsLinearLayoutPrivate::styleInfo() const -

179 { -

180

if (!m_styleInfo)

!m_styleInfo	Description
TRUE	never evaluated
FALSE	never evaluated

181

m_styleInfo.reset(new QGraphicsLayoutStyleInfo(this));

never executed: m_styleInfo.reset(new QGraphicsLayoutStyleInfo(this));

182

return m_styleInfo.data();

never executed: return m_styleInfo.data();

183 } -

184 -

185 /*! -

186 Constructs a QGraphicsLinearLayout instance. You can pass the -

187 \a orientation for the layout, either horizontal or vertical, and -

188 \a parent is passed to QGraphicsLayout's constructor. -

189 */ -

190 QGraphicsLinearLayout::QGraphicsLinearLayout(Qt::Orientation orientation, QGraphicsLayoutItem *parent) -

191 : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(orientation), parent) -

192 { -

193

}

never executed: end of block

194 -

195 /*! -

196 Constructs a QGraphicsLinearLayout instance using Qt::Horizontal -

197 orientation. \a parent is passed to QGraphicsLayout's constructor. -

198 */ -

199 QGraphicsLinearLayout::QGraphicsLinearLayout(QGraphicsLayoutItem *parent) -

200 : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(Qt::Horizontal), parent) -

201 { -

202

}

never executed: end of block

203 -

204 /*! -

205 Destroys the QGraphicsLinearLayout object. -

206 */ -

207 QGraphicsLinearLayout::~QGraphicsLinearLayout() -

208 { -

209

for (int i = count() - 1; i >= 0; --i) {

i >= 0	Description
TRUE	never evaluated
FALSE	never evaluated

210 QGraphicsLayoutItem *item = itemAt(i); -

211 // The following lines can be removed, but this removes the item -

212 // from the layout more efficiently than the implementation of -

213 // ~QGraphicsLayoutItem. -

214 removeAt(i); -

215

if (item) {

item	Description
TRUE	never evaluated
FALSE	never evaluated

216 item->setParentLayoutItem(0); -

217

if (item->ownedByLayout())

item->ownedByLayout()	Description
TRUE	never evaluated
FALSE	never evaluated

218

delete item;

never executed: delete item;

219

}

never executed: end of block

220

}

never executed: end of block

221

}

never executed: end of block

222 -

223 /*! -

224 Change the layout orientation to \a orientation. Changing the layout -

225 orientation will automatically invalidate the layout. -

226 -

227 \sa orientation() -

228 */ -

229 void QGraphicsLinearLayout::setOrientation(Qt::Orientation orientation) -

230 { -

231 Q_D(QGraphicsLinearLayout); -

232

if (orientation != d->orientation) {

orientation != d->orientation	Description
TRUE	never evaluated
FALSE	never evaluated

233 d->engine.transpose(); -

234 d->orientation = orientation; -

235 invalidate(); -

236

}

never executed: end of block

237

}

never executed: end of block

238 -

239 /*! -

240 Returns the layout orientation. -

241 \sa setOrientation() -

242 */ -

243 Qt::Orientation QGraphicsLinearLayout::orientation() const -

244 { -

245 Q_D(const QGraphicsLinearLayout); -

246

return d->orientation;

never executed: return d->orientation;

247 } -

248 -

249 /*! -

250 \fn void QGraphicsLinearLayout::addItem(QGraphicsLayoutItem *item) -

251 -

252 This convenience function is equivalent to calling -

253 insertItem(-1, \a item). -

254 */ -

255 -

256 /*! -

257 \fn void QGraphicsLinearLayout::addStretch(int stretch) -

258 -

259 This convenience function is equivalent to calling -

260 insertStretch(-1, \a stretch). -

261 */ -

262 -

263 /*! -

264 Inserts \a item into the layout at \a index, or before any item that is -

265 currently at \a index. -

266 -

267 \sa addItem(), itemAt(), insertStretch(), setItemSpacing() -

268 */ -

269 void QGraphicsLinearLayout::insertItem(int index, QGraphicsLayoutItem *item) -

270 { -

271 Q_D(QGraphicsLinearLayout); -

272

if (!item) {

!item	Description
TRUE	never evaluated
FALSE	never evaluated

273 qWarning("QGraphicsLinearLayout::insertItem: cannot insert null item"); -

274

return;

never executed: return;

275 } -

276

if (item == this) {

item == this	Description
TRUE	never evaluated
FALSE	never evaluated

277 qWarning("QGraphicsLinearLayout::insertItem: cannot insert itself"); -

278

return;

never executed: return;

279 } -

280 d->addChildLayoutItem(item); -

281 -

282 Q_ASSERT(item); -

283 d->fixIndex(&index); -

284 d->engine.insertRow(index, d->orientation); -

285 QGraphicsGridLayoutEngineItem *gridEngineItem = new QGraphicsGridLayoutEngineItem(item, d->gridRow(index), d->gridColumn(index), 1, 1, 0); -

286 d->engine.insertItem(gridEngineItem, index); -

287 invalidate(); -

288

}

never executed: end of block

289 -

290 /*! -

291 Inserts a stretch of \a stretch at \a index, or before any item that is -

292 currently at \a index. -

293 -

294 \sa addStretch(), setStretchFactor(), setItemSpacing(), insertItem() -

295 */ -

296 void QGraphicsLinearLayout::insertStretch(int index, int stretch) -

297 { -

298 Q_D(QGraphicsLinearLayout); -

299 d->fixIndex(&index); -

300 d->engine.insertRow(index, d->orientation); -

301 d->engine.setRowStretchFactor(index, stretch, d->orientation); -

302 invalidate(); -

303

}

never executed: end of block

304 -

305 /*! -

306 Removes \a item from the layout without destroying it. Ownership of -

307 \a item is transferred to the caller. -

308 -

309 \sa removeAt(), insertItem() -

310 */ -

311 void QGraphicsLinearLayout::removeItem(QGraphicsLayoutItem *item) -

312 { -

313 Q_D(QGraphicsLinearLayout); -

314

if (QGraphicsGridLayoutEngineItem *gridItem = d->engine.findLayoutItem(item)) {

QGraphicsGridL...youtItem(item)	Description
TRUE	never evaluated
FALSE	never evaluated

315 item->setParentLayoutItem(0); -

316 d->removeGridItem(gridItem); -

317 delete gridItem; -

318 invalidate(); -

319

}

never executed: end of block

320

}

never executed: end of block

321 -

322 /*! -

323 Removes the item at \a index without destroying it. Ownership of the item -

324 is transferred to the caller. -

325 -

326 \sa removeItem(), insertItem() -

327 */ -

328 void QGraphicsLinearLayout::removeAt(int index) -

329 { -

330 Q_D(QGraphicsLinearLayout); -

331

if (index < 0 || index >= d->engine.itemCount()) {

index < 0	Description
TRUE	never evaluated
FALSE	never evaluated

index >= d->engine.itemCount()	Description
TRUE	never evaluated
FALSE	never evaluated

332 qWarning("QGraphicsLinearLayout::removeAt: invalid index %d", index); -

333

return;

never executed: return;

334 } -

335 -

336

if (QGraphicsGridLayoutEngineItem *gridItem = static_cast<QGraphicsGridLayoutEngineItem*>(d->engine.itemAt(index))) {

QGraphicsGridL...itemAt(index))	Description
TRUE	never evaluated
FALSE	never evaluated

337

if (QGraphicsLayoutItem *layoutItem = gridItem->layoutItem())

QGraphicsLayou...->layoutItem()	Description
TRUE	never evaluated
FALSE	never evaluated

338

layoutItem->setParentLayoutItem(0);

never executed: layoutItem->setParentLayoutItem(0);

339 d->removeGridItem(gridItem); -

340 delete gridItem; -

341 invalidate(); -

342

}

never executed: end of block

343

}

never executed: end of block

344 -

345 /*! -

346 Sets the layout's spacing to \a spacing. Spacing refers to the -

347 vertical and horizontal distances between items. -

348 -

349 \sa setItemSpacing(), setStretchFactor(), QGraphicsGridLayout::setSpacing() -

350 */ -

351 void QGraphicsLinearLayout::setSpacing(qreal spacing) -

352 { -

353 Q_D(QGraphicsLinearLayout); -

354

if (spacing < 0) {

spacing < 0	Description
TRUE	never evaluated
FALSE	never evaluated

355 qWarning("QGraphicsLinearLayout::setSpacing: invalid spacing %g", spacing); -

356

return;

never executed: return;

357 } -

358 d->engine.setSpacing(spacing, Qt::Horizontal | Qt::Vertical); -

359 invalidate(); -

360

}

never executed: end of block

361 -

362 /*! -

363 Returns the layout's spacing. Spacing refers to the -

364 vertical and horizontal distances between items. -

365 -

366 \sa setSpacing() -

367 */ -

368 qreal QGraphicsLinearLayout::spacing() const -

369 { -

370 Q_D(const QGraphicsLinearLayout); -

371

return d->engine.spacing(d->orientation, d->styleInfo());

never executed: return d->engine.spacing(d->orientation, d->styleInfo());

372 } -

373 -

374 /*! -

375 Sets the spacing after item at \a index to \a spacing. -

376 */ -

377 void QGraphicsLinearLayout::setItemSpacing(int index, qreal spacing) -

378 { -

379 Q_D(QGraphicsLinearLayout); -

380 d->engine.setRowSpacing(index, spacing, d->orientation); -

381 invalidate(); -

382

}

never executed: end of block

383 /*! -

384 Returns the spacing after item at \a index. -

385 */ -

386 qreal QGraphicsLinearLayout::itemSpacing(int index) const -

387 { -

388 Q_D(const QGraphicsLinearLayout); -

389

return d->engine.rowSpacing(index, d->orientation);

never executed: return d->engine.rowSpacing(index, d->orientation);

390 } -

391 -

392 /*! -

393 Sets the stretch factor for \a item to \a stretch. If an item's stretch -

394 factor changes, this function will invalidate the layout. -

395 -

396 Setting \a stretch to 0 removes the stretch factor from the item, and is -

397 effectively equivalent to setting \a stretch to 1. -

398 -

399 \sa stretchFactor() -

400 */ -

401 void QGraphicsLinearLayout::setStretchFactor(QGraphicsLayoutItem *item, int stretch) -

402 { -

403 Q_D(QGraphicsLinearLayout); -

404

if (!item) {

!item	Description
TRUE	never evaluated
FALSE	never evaluated

405 qWarning("QGraphicsLinearLayout::setStretchFactor: cannot assign" -

406 " a stretch factor to a null item"); -

407

return;

never executed: return;

408 } -

409

if (stretchFactor(item) == stretch)

stretchFactor(item) == stretch	Description
TRUE	never evaluated
FALSE	never evaluated

410

return;

never executed: return;

411 d->engine.setStretchFactor(item, stretch, d->orientation); -

412 invalidate(); -

413

}

never executed: end of block

414 -

415 /*! -

416 Returns the stretch factor for \a item. The default stretch factor is 0, -

417 meaning that the item has no assigned stretch factor. -

418 -

419 \sa setStretchFactor() -

420 */ -

421 int QGraphicsLinearLayout::stretchFactor(QGraphicsLayoutItem *item) const -

422 { -

423 Q_D(const QGraphicsLinearLayout); -

424

if (!item) {

!item	Description
TRUE	never evaluated
FALSE	never evaluated

425 qWarning("QGraphicsLinearLayout::setStretchFactor: cannot return" -

426 " a stretch factor for a null item"); -

427

return 0;

never executed: return 0;

428 } -

429

return d->engine.stretchFactor(item, d->orientation);

never executed: return d->engine.stretchFactor(item, d->orientation);

430 } -

431 -

432 /*! -

433 Sets the alignment of \a item to \a alignment. If \a item's alignment -

434 changes, the layout is automatically invalidated. -

435 -

436 \sa alignment(), invalidate() -

437 */ -

438 void QGraphicsLinearLayout::setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment) -

439 { -

440 Q_D(QGraphicsLinearLayout); -

441

if (this->alignment(item) == alignment)

this->alignmen...) == alignment	Description
TRUE	never evaluated
FALSE	never evaluated

442

return;

never executed: return;

443 d->engine.setAlignment(item, alignment); -

444 invalidate(); -

445

}

never executed: end of block

446 -

447 /*! -

448 Returns the alignment for \a item. The default alignment is -

449 Qt::AlignTop | Qt::AlignLeft. -

450 -

451 The alignment decides how the item is positioned within its assigned space -

452 in the case where there's more space available in the layout than the -

453 widgets can occupy. -

454 -

455 \sa setAlignment() -

456 */ -

457 Qt::Alignment QGraphicsLinearLayout::alignment(QGraphicsLayoutItem *item) const -

458 { -

459 Q_D(const QGraphicsLinearLayout); -

460

return d->engine.alignment(item);

never executed: return d->engine.alignment(item);

461 } -

462 -

463 #if 0 // ### -

464 QSizePolicy::ControlTypes QGraphicsLinearLayout::controlTypes(LayoutSide side) const -

465 { -

466 return d->engine.controlTypes(side); -

467 } -

468 #endif -

469 -

470 /*! -

471 \reimp -

472 */ -

473 int QGraphicsLinearLayout::count() const -

474 { -

475 Q_D(const QGraphicsLinearLayout); -

476

return d->engine.itemCount();

never executed: return d->engine.itemCount();

477 } -

478 -

479 /*! -

480 \reimp -

481 When iterating from 0 and up, it will return the items in the visual arranged order. -

482 */ -

483 QGraphicsLayoutItem *QGraphicsLinearLayout::itemAt(int index) const -

484 { -

485 Q_D(const QGraphicsLinearLayout); -

486

if (index < 0 || index >= d->engine.itemCount()) {

index < 0	Description
TRUE	never evaluated
FALSE	never evaluated

index >= d->engine.itemCount()	Description
TRUE	never evaluated
FALSE	never evaluated

487 qWarning("QGraphicsLinearLayout::itemAt: invalid index %d", index); -

488

return 0;

never executed: return 0;

489 } -

490 QGraphicsLayoutItem *item = 0; -

491

if (QGraphicsGridLayoutEngineItem *gridItem = static_cast<QGraphicsGridLayoutEngineItem *>(d->engine.itemAt(index)))

QGraphicsGridL...itemAt(index))	Description
TRUE	never evaluated
FALSE	never evaluated

492

item = gridItem->layoutItem();

never executed: item = gridItem->layoutItem();

493

return item;

never executed: return item;

494 } -

495 -

496 /*! -

497 \reimp -

498 */ -

499 void QGraphicsLinearLayout::setGeometry(const QRectF &rect) -

500 { -

501 Q_D(QGraphicsLinearLayout); -

502 QGraphicsLayout::setGeometry(rect); -

503 QRectF effectiveRect = geometry(); -

504 qreal left, top, right, bottom; -

505 getContentsMargins(&left, &top, &right, &bottom); -

506 Qt::LayoutDirection visualDir = d->visualDirection(); -

507 d->engine.setVisualDirection(visualDir); -

508

if (visualDir == Qt::RightToLeft)

visualDir == Qt::RightToLeft	Description
TRUE	never evaluated
FALSE	never evaluated

509

qSwap(left, right);

never executed: qSwap(left, right);

510 effectiveRect.adjust(+left, +top, -right, -bottom); -

511 #ifdef QGRIDLAYOUTENGINE_DEBUG -

512 if (qt_graphicsLayoutDebug()) { -

513 static int counter = 0; -

514 qDebug() << counter++ << "QGraphicsLinearLayout::setGeometry - " << rect; -

515 dump(1); -

516 } -

517 #endif -

518 d->engine.setGeometries(effectiveRect, d->styleInfo()); -

519 #ifdef QGRIDLAYOUTENGINE_DEBUG -

520 if (qt_graphicsLayoutDebug()) { -

521 qDebug("post dump"); -

522 dump(1); -

523 } -

524 #endif -

525

}

never executed: end of block

526 -

527 /*! -

528 \reimp -

529 */ -

530 QSizeF QGraphicsLinearLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const -

531 { -

532 Q_D(const QGraphicsLinearLayout); -

533 qreal left, top, right, bottom; -

534 getContentsMargins(&left, &top, &right, &bottom); -

535 const QSizeF extraMargins(left + right, top + bottom); -

536

return d->engine.sizeHint(which , constraint - extraMargins, d->styleInfo()) + extraMargins;

never executed: return d->engine.sizeHint(which , constraint - extraMargins, d->styleInfo()) + extraMargins;

537 } -

538 -

539 /*! -

540 \reimp -

541 */ -

542 void QGraphicsLinearLayout::invalidate() -

543 { -

544 Q_D(QGraphicsLinearLayout); -

545 d->engine.invalidate(); -

546

if (d->m_styleInfo)

d->m_styleInfo	Description
TRUE	never evaluated
FALSE	never evaluated

547

d->m_styleInfo->invalidate();

never executed: d->m_styleInfo->invalidate();

548 QGraphicsLayout::invalidate(); -

549

}

never executed: end of block

550 -

551 /*! -

552 \internal -

553 */ -

554 void QGraphicsLinearLayout::dump(int indent) const -

555 { -

556 #ifdef QGRIDLAYOUTENGINE_DEBUG -

557 if (qt_graphicsLayoutDebug()) { -

558 Q_D(const QGraphicsLinearLayout); -

559 qDebug("%*s%s layout", indent, "", -

560 d->orientation == Qt::Horizontal ? "Horizontal" : "Vertical"); -

561 d->engine.dump(indent + 1); -

562 } -

563 #else -

564 Q_UNUSED(indent); -

565 #endif -

566

}

never executed: end of block

567 -

568 QT_END_NAMESPACE -

569 -

570 #endif //QT_NO_GRAPHICSVIEW -

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