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qscrollarea.cpp

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38****************************************************************************/-
39-
40#include "qscrollarea.h"-
41#include "private/qscrollarea_p.h"-
42-
43#ifndef QT_NO_SCROLLAREA-
44-
45#include "qscrollbar.h"-
46#include "qlayout.h"-
47#include "qstyle.h"-
48#include "qapplication.h"-
49#include "qvariant.h"-
50#include "qdebug.h"-
51#include "private/qlayoutengine_p.h"-
52-
53QT_BEGIN_NAMESPACE-
54-
55/*!-
56 \class QScrollArea-
57-
58 \brief The QScrollArea class provides a scrolling view onto-
59 another widget.-
60-
61 \ingroup basicwidgets-
62 \inmodule QtWidgets-
63-
64 A scroll area is used to display the contents of a child widget-
65 within a frame. If the widget exceeds the size of the frame, the-
66 view can provide scroll bars so that the entire area of the child-
67 widget can be viewed. The child widget must be specified with-
68 setWidget(). For example:-
69-
70 \snippet code/src_gui_widgets_qscrollarea.cpp 0-
71-
72 The code above creates a scroll area (shown in the images below)-
73 containing an image label. When scaling the image, the scroll area-
74 can provide the necessary scroll bars:-
75-
76 \table-
77 \row-
78 \li \inlineimage qscrollarea-noscrollbars.png-
79 \li \inlineimage qscrollarea-onescrollbar.png-
80 \li \inlineimage qscrollarea-twoscrollbars.png-
81 \endtable-
82-
83 The scroll bars appearance depends on the currently set \l-
84 {Qt::ScrollBarPolicy}{scroll bar policies}. You can control the-
85 appearance of the scroll bars using the inherited functionality-
86 from QAbstractScrollArea.-
87-
88 For example, you can set the-
89 QAbstractScrollArea::horizontalScrollBarPolicy and-
90 QAbstractScrollArea::verticalScrollBarPolicy properties. Or if you-
91 want the scroll bars to adjust dynamically when the contents of-
92 the scroll area changes, you can use the \l-
93 {QAbstractScrollArea::horizontalScrollBar()}{horizontalScrollBar()}-
94 and \l-
95 {QAbstractScrollArea::verticalScrollBar()}{verticalScrollBar()}-
96 functions (which enable you to access the scroll bars) and set the-
97 scroll bars' values whenever the scroll area's contents change,-
98 using the QScrollBar::setValue() function.-
99-
100 You can retrieve the child widget using the widget() function. The-
101 view can be made to be resizable with the setWidgetResizable()-
102 function. The alignment of the widget can be specified with-
103 setAlignment().-
104-
105 Two convenience functions ensureVisible() and-
106 ensureWidgetVisible() ensure a certain region of the contents is-
107 visible inside the viewport, by scrolling the contents if-
108 necessary.-
109-
110 \section1 Size Hints and Layouts-
111-
112 When using a scroll area to display the contents of a custom-
113 widget, it is important to ensure that the-
114 \l{QWidget::sizeHint}{size hint} of the child widget is set to a-
115 suitable value. If a standard QWidget is used for the child-
116 widget, it may be necessary to call QWidget::setMinimumSize() to-
117 ensure that the contents of the widget are shown correctly within-
118 the scroll area.-
119-
120 If a scroll area is used to display the contents of a widget that-
121 contains child widgets arranged in a layout, it is important to-
122 realize that the size policy of the layout will also determine the-
123 size of the widget. This is especially useful to know if you intend-
124 to dynamically change the contents of the layout. In such cases,-
125 setting the layout's \l{QLayout::sizeConstraint}{size constraint}-
126 property to one which provides constraints on the minimum and/or-
127 maximum size of the layout (e.g., QLayout::SetMinAndMaxSize) will-
128 cause the size of the scroll area to be updated whenever the-
129 contents of the layout changes.-
130-
131 For a complete example using the QScrollArea class, see the \l-
132 {widgets/imageviewer}{Image Viewer} example. The example shows how-
133 to combine QLabel and QScrollArea to display an image.-
134-
135 \sa QAbstractScrollArea, QScrollBar, {Image Viewer Example}-
136*/-
137-
138-
139/*!-
140 Constructs an empty scroll area with the given \a parent.-
141-
142 \sa setWidget()-
143*/-
144QScrollArea::QScrollArea(QWidget *parent)-
145 : QAbstractScrollArea(*new QScrollAreaPrivate,parent)-
146{-
147 Q_D(QScrollArea);-
148 d->viewport->setBackgroundRole(QPalette::NoRole);-
149 d->vbar->setSingleStep(20);-
150 d->hbar->setSingleStep(20);-
151 d->layoutChildren();-
152}
never executed: end of block
0
153-
154/*!-
155 \internal-
156*/-
157QScrollArea::QScrollArea(QScrollAreaPrivate &dd, QWidget *parent)-
158 : QAbstractScrollArea(dd, parent)-
159{-
160 Q_D(QScrollArea);-
161 d->viewport->setBackgroundRole(QPalette::NoRole);-
162 d->vbar->setSingleStep(20);-
163 d->hbar->setSingleStep(20);-
164 d->layoutChildren();-
165}
never executed: end of block
0
166-
167/*!-
168 Destroys the scroll area and its child widget.-
169-
170 \sa setWidget()-
171*/-
172QScrollArea::~QScrollArea()-
173{-
174}-
175-
176void QScrollAreaPrivate::updateWidgetPosition()-
177{-
178 Q_Q(QScrollArea);-
179 Qt::LayoutDirection dir = q->layoutDirection();-
180 QRect scrolled = QStyle::visualRect(dir, viewport->rect(), QRect(QPoint(-hbar->value(), -vbar->value()), widget->size()));-
181 QRect aligned = QStyle::alignedRect(dir, alignment, widget->size(), viewport->rect());-
182 widget->move(widget->width() < viewport->width() ? aligned.x() : scrolled.x(),-
183 widget->height() < viewport->height() ? aligned.y() : scrolled.y());-
184}
never executed: end of block
0
185-
186void QScrollAreaPrivate::updateScrollBars()-
187{-
188 Q_Q(QScrollArea);-
189 if (!widget)
!widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
190 return;
never executed: return;
0
191 QSize p = viewport->size();-
192 QSize m = q->maximumViewportSize();-
193-
194 QSize min = qSmartMinSize(widget);-
195 QSize max = qSmartMaxSize(widget);-
196-
197 if (resizable) {
resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
198 if ((widget->layout() ? widget->layout()->hasHeightForWidth() : widget->sizePolicy().hasHeightForWidth())) {
(widget->layou...ghtForWidth())Description
TRUEnever evaluated
FALSEnever evaluated
widget->layout()Description
TRUEnever evaluated
FALSEnever evaluated
0
199 QSize p_hfw = p.expandedTo(min).boundedTo(max);-
200 int h = widget->heightForWidth( p_hfw.width() );-
201 min = QSize(p_hfw.width(), qMax(p_hfw.height(), h));-
202 }
never executed: end of block
0
203 }
never executed: end of block
0
204-
205 if ((resizable && m.expandedTo(min) == m && m.boundedTo(max) == m)
resizableDescription
TRUEnever evaluated
FALSEnever evaluated
m.expandedTo(min) == mDescription
TRUEnever evaluated
FALSEnever evaluated
m.boundedTo(max) == mDescription
TRUEnever evaluated
FALSEnever evaluated
0
206 || (!resizable && m.expandedTo(widget->size()) == m))
!resizableDescription
TRUEnever evaluated
FALSEnever evaluated
m.expandedTo(w...->size()) == mDescription
TRUEnever evaluated
FALSEnever evaluated
0
207 p = m; // no scroll bars needed
never executed: p = m;
0
208-
209 if (resizable)
resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
210 widget->resize(p.expandedTo(min).boundedTo(max));
never executed: widget->resize(p.expandedTo(min).boundedTo(max));
0
211 QSize v = widget->size();-
212-
213 hbar->setRange(0, v.width() - p.width());-
214 hbar->setPageStep(p.width());-
215 vbar->setRange(0, v.height() - p.height());-
216 vbar->setPageStep(p.height());-
217 updateWidgetPosition();-
218-
219}
never executed: end of block
0
220-
221/*!-
222 Returns the scroll area's widget, or 0 if there is none.-
223-
224 \sa setWidget()-
225*/-
226-
227QWidget *QScrollArea::widget() const-
228{-
229 Q_D(const QScrollArea);-
230 return d->widget;
never executed: return d->widget;
0
231}-
232-
233/*!-
234 \fn void QScrollArea::setWidget(QWidget *widget)-
235-
236 Sets the scroll area's \a widget.-
237-
238 The \a widget becomes a child of the scroll area, and will be-
239 destroyed when the scroll area is deleted or when a new widget is-
240 set.-
241-
242 The widget's \l{QWidget::setAutoFillBackground()}{autoFillBackground}-
243 property will be set to \c{true}.-
244-
245 If the scroll area is visible when the \a widget is-
246 added, you must \l{QWidget::}{show()} it explicitly.-
247-
248 Note that You must add the layout of \a widget before you call-
249 this function; if you add it later, the \a widget will not be-
250 visible - regardless of when you \l{QWidget::}{show()} the scroll-
251 area. In this case, you can also not \l{QWidget::}{show()} the \a-
252 widget later.-
253-
254 \sa widget()-
255*/-
256void QScrollArea::setWidget(QWidget *widget)-
257{-
258 Q_D(QScrollArea);-
259 if (widget == d->widget || !widget)
widget == d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
!widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
260 return;
never executed: return;
0
261-
262 delete d->widget;-
263 d->widget = 0;-
264 d->hbar->setValue(0);-
265 d->vbar->setValue(0);-
266 if (widget->parentWidget() != d->viewport)
widget->parent...!= d->viewportDescription
TRUEnever evaluated
FALSEnever evaluated
0
267 widget->setParent(d->viewport);
never executed: widget->setParent(d->viewport);
0
268 if (!widget->testAttribute(Qt::WA_Resized))
!widget->testA...t::WA_Resized)Description
TRUEnever evaluated
FALSEnever evaluated
0
269 widget->resize(widget->sizeHint());
never executed: widget->resize(widget->sizeHint());
0
270 d->widget = widget;-
271 d->widget->setAutoFillBackground(true);-
272 widget->installEventFilter(this);-
273 d->widgetSize = QSize();-
274 d->updateScrollBars();-
275 d->widget->show();-
276-
277}
never executed: end of block
0
278-
279/*!-
280 Removes the scroll area's widget, and passes ownership of the-
281 widget to the caller.-
282-
283 \sa widget()-
284 */-
285QWidget *QScrollArea::takeWidget()-
286{-
287 Q_D(QScrollArea);-
288 QWidget *w = d->widget;-
289 d->widget = 0;-
290 if (w)
wDescription
TRUEnever evaluated
FALSEnever evaluated
0
291 w->setParent(0);
never executed: w->setParent(0);
0
292 return w;
never executed: return w;
0
293}-
294-
295/*!-
296 \reimp-
297 */-
298bool QScrollArea::event(QEvent *e)-
299{-
300 Q_D(QScrollArea);-
301 if (e->type() == QEvent::StyleChange || e->type() == QEvent::LayoutRequest) {
e->type() == Q...t::StyleChangeDescription
TRUEnever evaluated
FALSEnever evaluated
e->type() == Q...:LayoutRequestDescription
TRUEnever evaluated
FALSEnever evaluated
0
302 d->updateScrollBars();-
303 }
never executed: end of block
0
304#ifdef QT_KEYPAD_NAVIGATION-
305 else if (QApplication::keypadNavigationEnabled()) {-
306 if (e->type() == QEvent::Show)-
307 QApplication::instance()->installEventFilter(this);-
308 else if (e->type() == QEvent::Hide)-
309 QApplication::instance()->removeEventFilter(this);-
310 }-
311#endif-
312 return QAbstractScrollArea::event(e);
never executed: return QAbstractScrollArea::event(e);
0
313}-
314-
315-
316/*!-
317 \reimp-
318 */-
319bool QScrollArea::eventFilter(QObject *o, QEvent *e)-
320{-
321 Q_D(QScrollArea);-
322#ifdef QT_KEYPAD_NAVIGATION-
323 if (d->widget && o != d->widget && e->type() == QEvent::FocusIn-
324 && QApplication::keypadNavigationEnabled()) {-
325 if (o->isWidgetType())-
326 ensureWidgetVisible(static_cast<QWidget *>(o));-
327 }-
328#endif-
329 if (o == d->widget && e->type() == QEvent::Resize)
o == d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
e->type() == QEvent::ResizeDescription
TRUEnever evaluated
FALSEnever evaluated
0
330 d->updateScrollBars();
never executed: d->updateScrollBars();
0
331-
332 return QAbstractScrollArea::eventFilter(o, e);
never executed: return QAbstractScrollArea::eventFilter(o, e);
0
333}-
334-
335/*!-
336 \reimp-
337 */-
338void QScrollArea::resizeEvent(QResizeEvent *)-
339{-
340 Q_D(QScrollArea);-
341 d->updateScrollBars();-
342-
343}
never executed: end of block
0
344-
345-
346/*!\reimp-
347 */-
348void QScrollArea::scrollContentsBy(int, int)-
349{-
350 Q_D(QScrollArea);-
351 if (!d->widget)
!d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
352 return;
never executed: return;
0
353 d->updateWidgetPosition();-
354}
never executed: end of block
0
355-
356-
357/*!-
358 \property QScrollArea::widgetResizable-
359 \brief whether the scroll area should resize the view widget-
360-
361 If this property is set to false (the default), the scroll area-
362 honors the size of its widget. Regardless of this property, you-
363 can programmatically resize the widget using widget()->resize(),-
364 and the scroll area will automatically adjust itself to the new-
365 size.-
366-
367 If this property is set to true, the scroll area will-
368 automatically resize the widget in order to avoid scroll bars-
369 where they can be avoided, or to take advantage of extra space.-
370*/-
371bool QScrollArea::widgetResizable() const-
372{-
373 Q_D(const QScrollArea);-
374 return d->resizable;
never executed: return d->resizable;
0
375}-
376-
377void QScrollArea::setWidgetResizable(bool resizable)-
378{-
379 Q_D(QScrollArea);-
380 d->resizable = resizable;-
381 updateGeometry();-
382 d->updateScrollBars();-
383}
never executed: end of block
0
384-
385/*!-
386 \reimp-
387 */-
388QSize QScrollArea::sizeHint() const-
389{-
390 Q_D(const QScrollArea);-
391 int f = 2 * d->frameWidth;-
392 QSize sz(f, f);-
393 int h = fontMetrics().height();-
394 if (d->widget) {
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
395 if (!d->widgetSize.isValid())
!d->widgetSize.isValid()Description
TRUEnever evaluated
FALSEnever evaluated
0
396 d->widgetSize = d->resizable ? d->widget->sizeHint() : d->widget->size();
never executed: d->widgetSize = d->resizable ? d->widget->sizeHint() : d->widget->size();
d->resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
397 sz += d->widgetSize;-
398 } else {
never executed: end of block
0
399 sz += QSize(12 * h, 8 * h);-
400 }
never executed: end of block
0
401 if (d->vbarpolicy == Qt::ScrollBarAlwaysOn)
d->vbarpolicy ...ollBarAlwaysOnDescription
TRUEnever evaluated
FALSEnever evaluated
0
402 sz.setWidth(sz.width() + d->vbar->sizeHint().width());
never executed: sz.setWidth(sz.width() + d->vbar->sizeHint().width());
0
403 if (d->hbarpolicy == Qt::ScrollBarAlwaysOn)
d->hbarpolicy ...ollBarAlwaysOnDescription
TRUEnever evaluated
FALSEnever evaluated
0
404 sz.setHeight(sz.height() + d->hbar->sizeHint().height());
never executed: sz.setHeight(sz.height() + d->hbar->sizeHint().height());
0
405 return sz.boundedTo(QSize(36 * h, 24 * h));
never executed: return sz.boundedTo(QSize(36 * h, 24 * h));
0
406}-
407-
408/*!-
409 \reimp-
410 */-
411QSize QScrollArea::viewportSizeHint() const-
412{-
413 Q_D(const QScrollArea);-
414 if (d->widget) {
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
415 return d->resizable ? d->widget->sizeHint() : d->widget->size();
never executed: return d->resizable ? d->widget->sizeHint() : d->widget->size();
0
416 }-
417 const int h = fontMetrics().height();-
418 return QSize(6 * h, 4 * h);
never executed: return QSize(6 * h, 4 * h);
0
419}-
420-
421-
422/*!-
423 \reimp-
424 */-
425bool QScrollArea::focusNextPrevChild(bool next)-
426{-
427 if (QWidget::focusNextPrevChild(next)) {
QWidget::focus...revChild(next)Description
TRUEnever evaluated
FALSEnever evaluated
0
428 if (QWidget *fw = focusWidget())
QWidget *fw = focusWidget()Description
TRUEnever evaluated
FALSEnever evaluated
0
429 ensureWidgetVisible(fw);
never executed: ensureWidgetVisible(fw);
0
430 return true;
never executed: return true;
0
431 }-
432 return false;
never executed: return false;
0
433}-
434-
435/*!-
436 Scrolls the contents of the scroll area so that the point (\a x, \a y) is visible-
437 inside the region of the viewport with margins specified in pixels by \a xmargin and-
438 \a ymargin. If the specified point cannot be reached, the contents are scrolled to-
439 the nearest valid position. The default value for both margins is 50 pixels.-
440*/-
441void QScrollArea::ensureVisible(int x, int y, int xmargin, int ymargin)-
442{-
443 Q_D(QScrollArea);-
444-
445 int logicalX = QStyle::visualPos(layoutDirection(), d->viewport->rect(), QPoint(x, y)).x();-
446-
447 if (logicalX - xmargin < d->hbar->value()) {
logicalX - xma...>hbar->value()Description
TRUEnever evaluated
FALSEnever evaluated
0
448 d->hbar->setValue(qMax(0, logicalX - xmargin));-
449 } else if (logicalX > d->hbar->value() + d->viewport->width() - xmargin) {
never executed: end of block
logicalX > d->...th() - xmarginDescription
TRUEnever evaluated
FALSEnever evaluated
0
450 d->hbar->setValue(qMin(logicalX - d->viewport->width() + xmargin, d->hbar->maximum()));-
451 }
never executed: end of block
0
452-
453 if (y - ymargin < d->vbar->value()) {
y - ymargin < d->vbar->value()Description
TRUEnever evaluated
FALSEnever evaluated
0
454 d->vbar->setValue(qMax(0, y - ymargin));-
455 } else if (y > d->vbar->value() + d->viewport->height() - ymargin) {
never executed: end of block
y > d->vbar->v...ht() - ymarginDescription
TRUEnever evaluated
FALSEnever evaluated
0
456 d->vbar->setValue(qMin(y - d->viewport->height() + ymargin, d->vbar->maximum()));-
457 }
never executed: end of block
0
458}
never executed: end of block
0
459-
460/*!-
461 \since 4.2-
462-
463 Scrolls the contents of the scroll area so that the \a childWidget-
464 of QScrollArea::widget() is visible inside the viewport with-
465 margins specified in pixels by \a xmargin and \a ymargin. If the-
466 specified point cannot be reached, the contents are scrolled to-
467 the nearest valid position. The default value for both margins is-
468 50 pixels.-
469-
470*/-
471void QScrollArea::ensureWidgetVisible(QWidget *childWidget, int xmargin, int ymargin)-
472{-
473 Q_D(QScrollArea);-
474-
475 if (!d->widget->isAncestorOf(childWidget))
!d->widget->is...f(childWidget)Description
TRUEnever evaluated
FALSEnever evaluated
0
476 return;
never executed: return;
0
477-
478 const QRect microFocus = childWidget->inputMethodQuery(Qt::ImCursorRectangle).toRect();-
479 const QRect defaultMicroFocus =-
480 childWidget->QWidget::inputMethodQuery(Qt::ImCursorRectangle).toRect();-
481 QRect focusRect = (microFocus != defaultMicroFocus)
(microFocus !=...ultMicroFocus)Description
TRUEnever evaluated
FALSEnever evaluated
0
482 ? QRect(childWidget->mapTo(d->widget, microFocus.topLeft()), microFocus.size())-
483 : QRect(childWidget->mapTo(d->widget, QPoint(0,0)), childWidget->size());-
484 const QRect visibleRect(-d->widget->pos(), d->viewport->size());-
485-
486 if (visibleRect.contains(focusRect))
visibleRect.co...ins(focusRect)Description
TRUEnever evaluated
FALSEnever evaluated
0
487 return;
never executed: return;
0
488-
489 focusRect.adjust(-xmargin, -ymargin, xmargin, ymargin);-
490-
491 if (focusRect.width() > visibleRect.width())
focusRect.widt...leRect.width()Description
TRUEnever evaluated
FALSEnever evaluated
0
492 d->hbar->setValue(focusRect.center().x() - d->viewport->width() / 2);
never executed: d->hbar->setValue(focusRect.center().x() - d->viewport->width() / 2);
0
493 else if (focusRect.right() > visibleRect.right())
focusRect.righ...leRect.right()Description
TRUEnever evaluated
FALSEnever evaluated
0
494 d->hbar->setValue(focusRect.right() - d->viewport->width());
never executed: d->hbar->setValue(focusRect.right() - d->viewport->width());
0
495 else if (focusRect.left() < visibleRect.left())
focusRect.left...bleRect.left()Description
TRUEnever evaluated
FALSEnever evaluated
0
496 d->hbar->setValue(focusRect.left());
never executed: d->hbar->setValue(focusRect.left());
0
497-
498 if (focusRect.height() > visibleRect.height())
focusRect.heig...eRect.height()Description
TRUEnever evaluated
FALSEnever evaluated
0
499 d->vbar->setValue(focusRect.center().y() - d->viewport->height() / 2);
never executed: d->vbar->setValue(focusRect.center().y() - d->viewport->height() / 2);
0
500 else if (focusRect.bottom() > visibleRect.bottom())
focusRect.bott...eRect.bottom()Description
TRUEnever evaluated
FALSEnever evaluated
0
501 d->vbar->setValue(focusRect.bottom() - d->viewport->height());
never executed: d->vbar->setValue(focusRect.bottom() - d->viewport->height());
0
502 else if (focusRect.top() < visibleRect.top())
focusRect.top(...ibleRect.top()Description
TRUEnever evaluated
FALSEnever evaluated
0
503 d->vbar->setValue(focusRect.top());
never executed: d->vbar->setValue(focusRect.top());
0
504}
never executed: end of block
0
505-
506-
507/*!-
508 \property QScrollArea::alignment-
509 \brief the alignment of the scroll area's widget-
510 \since 4.2-
511-
512 A valid alignment is a combination of the following flags:-
513 \list-
514 \li \c Qt::AlignLeft-
515 \li \c Qt::AlignHCenter-
516 \li \c Qt::AlignRight-
517 \li \c Qt::AlignTop-
518 \li \c Qt::AlignVCenter-
519 \li \c Qt::AlignBottom-
520 \endlist-
521 By default, the widget stays rooted to the top-left corner of the-
522 scroll area.-
523*/-
524-
525void QScrollArea::setAlignment(Qt::Alignment alignment)-
526{-
527 Q_D(QScrollArea);-
528 d->alignment = alignment;-
529 if (d->widget)
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
530 d->updateWidgetPosition();
never executed: d->updateWidgetPosition();
0
531}
never executed: end of block
0
532-
533Qt::Alignment QScrollArea::alignment() const-
534{-
535 Q_D(const QScrollArea);-
536 return d->alignment;
never executed: return d->alignment;
0
537}-
538-
539QT_END_NAMESPACE-
540-
541#include "moc_qscrollarea.cpp"-
542-
543#endif // QT_NO_SCROLLAREA-
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