qscrollarea.cpp

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33-
34#include "qscrollarea.h"-
35#include "private/qscrollarea_p.h"-
36-
37#ifndef QT_NO_SCROLLAREA-
38-
39#include "qscrollbar.h"-
40#include "qlayout.h"-
41#include "qstyle.h"-
42#include "qapplication.h"-
43#include "qvariant.h"-
44#include "qdebug.h"-
45#include "private/qlayoutengine_p.h"-
46-
47QT_BEGIN_NAMESPACE-
48-
49/*!-
50 \class QScrollArea-
51-
52 \brief The QScrollArea class provides a scrolling view onto-
53 another widget.-
54-
55 \ingroup basicwidgets-
56 \inmodule QtWidgets-
57-
58 A scroll area is used to display the contents of a child widget-
59 within a frame. If the widget exceeds the size of the frame, the-
60 view can provide scroll bars so that the entire area of the child-
61 widget can be viewed. The child widget must be specified with-
62 setWidget(). For example:-
63-
64 \snippet code/src_gui_widgets_qscrollarea.cpp 0-
65-
66 The code above creates a scroll area (shown in the images below)-
67 containing an image label. When scaling the image, the scroll area-
68 can provide the necessary scroll bars:-
69-
70 \table-
71 \row-
72 \li \inlineimage qscrollarea-noscrollbars.png-
73 \li \inlineimage qscrollarea-onescrollbar.png-
74 \li \inlineimage qscrollarea-twoscrollbars.png-
75 \endtable-
76-
77 The scroll bars appearance depends on the currently set \l-
78 {Qt::ScrollBarPolicy}{scroll bar policies}. You can control the-
79 appearance of the scroll bars using the inherited functionality-
80 from QAbstractScrollArea.-
81-
82 For example, you can set the-
83 QAbstractScrollArea::horizontalScrollBarPolicy and-
84 QAbstractScrollArea::verticalScrollBarPolicy properties. Or if you-
85 want the scroll bars to adjust dynamically when the contents of-
86 the scroll area changes, you can use the \l-
87 {QAbstractScrollArea::horizontalScrollBar()}{horizontalScrollBar()}-
88 and \l-
89 {QAbstractScrollArea::verticalScrollBar()}{verticalScrollBar()}-
90 functions (which enable you to access the scroll bars) and set the-
91 scroll bars' values whenever the scroll area's contents change,-
92 using the QScrollBar::setValue() function.-
93-
94 You can retrieve the child widget using the widget() function. The-
95 view can be made to be resizable with the setWidgetResizable()-
96 function. The alignment of the widget can be specified with-
97 setAlignment().-
98-
99 Two convenience functions ensureVisible() and-
100 ensureWidgetVisible() ensure a certain region of the contents is-
101 visible inside the viewport, by scrolling the contents if-
102 necessary.-
103-
104 \section1 Size Hints and Layouts-
105-
106 When using a scroll area to display the contents of a custom-
107 widget, it is important to ensure that the-
108 \l{QWidget::sizeHint}{size hint} of the child widget is set to a-
109 suitable value. If a standard QWidget is used for the child-
110 widget, it may be necessary to call QWidget::setMinimumSize() to-
111 ensure that the contents of the widget are shown correctly within-
112 the scroll area.-
113-
114 If a scroll area is used to display the contents of a widget that-
115 contains child widgets arranged in a layout, it is important to-
116 realize that the size policy of the layout will also determine the-
117 size of the widget. This is especially useful to know if you intend-
118 to dynamically change the contents of the layout. In such cases,-
119 setting the layout's \l{QLayout::sizeConstraint}{size constraint}-
120 property to one which provides constraints on the minimum and/or-
121 maximum size of the layout (e.g., QLayout::SetMinAndMaxSize) will-
122 cause the size of the scroll area to be updated whenever the-
123 contents of the layout changes.-
124-
125 For a complete example using the QScrollArea class, see the \l-
126 {widgets/imageviewer}{Image Viewer} example. The example shows how-
127 to combine QLabel and QScrollArea to display an image.-
128-
129 \sa QAbstractScrollArea, QScrollBar, {Image Viewer Example}-
130*/-
131-
132-
133/*!-
134 Constructs an empty scroll area with the given \a parent.-
135-
136 \sa setWidget()-
137*/-
138QScrollArea::QScrollArea(QWidget *parent)-
139 : QAbstractScrollArea(*new QScrollAreaPrivate,parent)-
140{-
141 Q_D(QScrollArea);-
142 d->viewport->setBackgroundRole(QPalette::NoRole);-
143 d->vbar->setSingleStep(20);-
144 d->hbar->setSingleStep(20);-
145 d->layoutChildren();-
146}
never executed: end of block
0
147-
148/*!-
149 \internal-
150*/-
151QScrollArea::QScrollArea(QScrollAreaPrivate &dd, QWidget *parent)-
152 : QAbstractScrollArea(dd, parent)-
153{-
154 Q_D(QScrollArea);-
155 d->viewport->setBackgroundRole(QPalette::NoRole);-
156 d->vbar->setSingleStep(20);-
157 d->hbar->setSingleStep(20);-
158 d->layoutChildren();-
159}
never executed: end of block
0
160-
161/*!-
162 Destroys the scroll area and its child widget.-
163-
164 \sa setWidget()-
165*/-
166QScrollArea::~QScrollArea()-
167{-
168}-
169-
170void QScrollAreaPrivate::updateWidgetPosition()-
171{-
172 Q_Q(QScrollArea);-
173 Qt::LayoutDirection dir = q->layoutDirection();-
174 QRect scrolled = QStyle::visualRect(dir, viewport->rect(), QRect(QPoint(-hbar->value(), -vbar->value()), widget->size()));-
175 QRect aligned = QStyle::alignedRect(dir, alignment, widget->size(), viewport->rect());-
176 widget->move(widget->width() < viewport->width() ? aligned.x() : scrolled.x(),-
177 widget->height() < viewport->height() ? aligned.y() : scrolled.y());-
178}
never executed: end of block
0
179-
180void QScrollAreaPrivate::updateScrollBars()-
181{-
182 Q_Q(QScrollArea);-
183 if (!widget)
!widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
184 return;
never executed: return;
0
185 QSize p = viewport->size();-
186 QSize m = q->maximumViewportSize();-
187-
188 QSize min = qSmartMinSize(widget);-
189 QSize max = qSmartMaxSize(widget);-
190-
191 if (resizable) {
resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
192 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
193 QSize p_hfw = p.expandedTo(min).boundedTo(max);-
194 int h = widget->heightForWidth( p_hfw.width() );-
195 min = QSize(p_hfw.width(), qMax(p_hfw.height(), h));-
196 }
never executed: end of block
0
197 }
never executed: end of block
0
198-
199 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
200 || (!resizable && m.expandedTo(widget->size()) == m))
!resizableDescription
TRUEnever evaluated
FALSEnever evaluated
m.expandedTo(w...->size()) == mDescription
TRUEnever evaluated
FALSEnever evaluated
0
201 p = m; // no scroll bars needed
never executed: p = m;
0
202-
203 if (resizable)
resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
204 widget->resize(p.expandedTo(min).boundedTo(max));
never executed: widget->resize(p.expandedTo(min).boundedTo(max));
0
205 QSize v = widget->size();-
206-
207 hbar->setRange(0, v.width() - p.width());-
208 hbar->setPageStep(p.width());-
209 vbar->setRange(0, v.height() - p.height());-
210 vbar->setPageStep(p.height());-
211 updateWidgetPosition();-
212-
213}
never executed: end of block
0
214-
215/*!-
216 Returns the scroll area's widget, or 0 if there is none.-
217-
218 \sa setWidget()-
219*/-
220-
221QWidget *QScrollArea::widget() const-
222{-
223 Q_D(const QScrollArea);-
224 return d->widget;
never executed: return d->widget;
0
225}-
226-
227/*!-
228 \fn void QScrollArea::setWidget(QWidget *widget)-
229-
230 Sets the scroll area's \a widget.-
231-
232 The \a widget becomes a child of the scroll area, and will be-
233 destroyed when the scroll area is deleted or when a new widget is-
234 set.-
235-
236 The widget's \l{QWidget::setAutoFillBackground()}{autoFillBackground}-
237 property will be set to \c{true}.-
238-
239 If the scroll area is visible when the \a widget is-
240 added, you must \l{QWidget::}{show()} it explicitly.-
241-
242 Note that You must add the layout of \a widget before you call-
243 this function; if you add it later, the \a widget will not be-
244 visible - regardless of when you \l{QWidget::}{show()} the scroll-
245 area. In this case, you can also not \l{QWidget::}{show()} the \a-
246 widget later.-
247-
248 \sa widget()-
249*/-
250void QScrollArea::setWidget(QWidget *widget)-
251{-
252 Q_D(QScrollArea);-
253 if (widget == d->widget || !widget)
widget == d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
!widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
254 return;
never executed: return;
0
255-
256 delete d->widget;-
257 d->widget = 0;-
258 d->hbar->setValue(0);-
259 d->vbar->setValue(0);-
260 if (widget->parentWidget() != d->viewport)
widget->parent...!= d->viewportDescription
TRUEnever evaluated
FALSEnever evaluated
0
261 widget->setParent(d->viewport);
never executed: widget->setParent(d->viewport);
0
262 if (!widget->testAttribute(Qt::WA_Resized))
!widget->testA...t::WA_Resized)Description
TRUEnever evaluated
FALSEnever evaluated
0
263 widget->resize(widget->sizeHint());
never executed: widget->resize(widget->sizeHint());
0
264 d->widget = widget;-
265 d->widget->setAutoFillBackground(true);-
266 widget->installEventFilter(this);-
267 d->widgetSize = QSize();-
268 d->updateScrollBars();-
269 d->widget->show();-
270-
271}
never executed: end of block
0
272-
273/*!-
274 Removes the scroll area's widget, and passes ownership of the-
275 widget to the caller.-
276-
277 \sa widget()-
278 */-
279QWidget *QScrollArea::takeWidget()-
280{-
281 Q_D(QScrollArea);-
282 QWidget *w = d->widget;-
283 d->widget = 0;-
284 if (w)
wDescription
TRUEnever evaluated
FALSEnever evaluated
0
285 w->setParent(0);
never executed: w->setParent(0);
0
286 return w;
never executed: return w;
0
287}-
288-
289/*!-
290 \reimp-
291 */-
292bool QScrollArea::event(QEvent *e)-
293{-
294 Q_D(QScrollArea);-
295 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
296 d->updateScrollBars();-
297 }
never executed: end of block
0
298#ifdef QT_KEYPAD_NAVIGATION-
299 else if (QApplication::keypadNavigationEnabled()) {-
300 if (e->type() == QEvent::Show)-
301 QApplication::instance()->installEventFilter(this);-
302 else if (e->type() == QEvent::Hide)-
303 QApplication::instance()->removeEventFilter(this);-
304 }-
305#endif-
306 return QAbstractScrollArea::event(e);
never executed: return QAbstractScrollArea::event(e);
0
307}-
308-
309-
310/*!-
311 \reimp-
312 */-
313bool QScrollArea::eventFilter(QObject *o, QEvent *e)-
314{-
315 Q_D(QScrollArea);-
316#ifdef QT_KEYPAD_NAVIGATION-
317 if (d->widget && o != d->widget && e->type() == QEvent::FocusIn-
318 && QApplication::keypadNavigationEnabled()) {-
319 if (o->isWidgetType())-
320 ensureWidgetVisible(static_cast<QWidget *>(o));-
321 }-
322#endif-
323 if (o == d->widget && e->type() == QEvent::Resize)
o == d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
e->type() == QEvent::ResizeDescription
TRUEnever evaluated
FALSEnever evaluated
0
324 d->updateScrollBars();
never executed: d->updateScrollBars();
0
325-
326 return QAbstractScrollArea::eventFilter(o, e);
never executed: return QAbstractScrollArea::eventFilter(o, e);
0
327}-
328-
329/*!-
330 \reimp-
331 */-
332void QScrollArea::resizeEvent(QResizeEvent *)-
333{-
334 Q_D(QScrollArea);-
335 d->updateScrollBars();-
336-
337}
never executed: end of block
0
338-
339-
340/*!\reimp-
341 */-
342void QScrollArea::scrollContentsBy(int, int)-
343{-
344 Q_D(QScrollArea);-
345 if (!d->widget)
!d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
346 return;
never executed: return;
0
347 d->updateWidgetPosition();-
348}
never executed: end of block
0
349-
350-
351/*!-
352 \property QScrollArea::widgetResizable-
353 \brief whether the scroll area should resize the view widget-
354-
355 If this property is set to false (the default), the scroll area-
356 honors the size of its widget. Regardless of this property, you-
357 can programmatically resize the widget using widget()->resize(),-
358 and the scroll area will automatically adjust itself to the new-
359 size.-
360-
361 If this property is set to true, the scroll area will-
362 automatically resize the widget in order to avoid scroll bars-
363 where they can be avoided, or to take advantage of extra space.-
364*/-
365bool QScrollArea::widgetResizable() const-
366{-
367 Q_D(const QScrollArea);-
368 return d->resizable;
never executed: return d->resizable;
0
369}-
370-
371void QScrollArea::setWidgetResizable(bool resizable)-
372{-
373 Q_D(QScrollArea);-
374 d->resizable = resizable;-
375 updateGeometry();-
376 d->updateScrollBars();-
377}
never executed: end of block
0
378-
379/*!-
380 \reimp-
381 */-
382QSize QScrollArea::sizeHint() const-
383{-
384 Q_D(const QScrollArea);-
385 int f = 2 * d->frameWidth;-
386 QSize sz(f, f);-
387 int h = fontMetrics().height();-
388 if (d->widget) {
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
389 if (!d->widgetSize.isValid())
!d->widgetSize.isValid()Description
TRUEnever evaluated
FALSEnever evaluated
0
390 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
391 sz += d->widgetSize;-
392 } else {
never executed: end of block
0
393 sz += QSize(12 * h, 8 * h);-
394 }
never executed: end of block
0
395 if (d->vbarpolicy == Qt::ScrollBarAlwaysOn)
d->vbarpolicy ...ollBarAlwaysOnDescription
TRUEnever evaluated
FALSEnever evaluated
0
396 sz.setWidth(sz.width() + d->vbar->sizeHint().width());
never executed: sz.setWidth(sz.width() + d->vbar->sizeHint().width());
0
397 if (d->hbarpolicy == Qt::ScrollBarAlwaysOn)
d->hbarpolicy ...ollBarAlwaysOnDescription
TRUEnever evaluated
FALSEnever evaluated
0
398 sz.setHeight(sz.height() + d->hbar->sizeHint().height());
never executed: sz.setHeight(sz.height() + d->hbar->sizeHint().height());
0
399 return sz.boundedTo(QSize(36 * h, 24 * h));
never executed: return sz.boundedTo(QSize(36 * h, 24 * h));
0
400}-
401-
402/*!-
403 \reimp-
404 */-
405QSize QScrollArea::viewportSizeHint() const-
406{-
407 Q_D(const QScrollArea);-
408 if (d->widget) {
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
409 return d->resizable ? d->widget->sizeHint() : d->widget->size();
never executed: return d->resizable ? d->widget->sizeHint() : d->widget->size();
d->resizableDescription
TRUEnever evaluated
FALSEnever evaluated
0
410 }-
411 const int h = fontMetrics().height();-
412 return QSize(6 * h, 4 * h);
never executed: return QSize(6 * h, 4 * h);
0
413}-
414-
415-
416/*!-
417 \reimp-
418 */-
419bool QScrollArea::focusNextPrevChild(bool next)-
420{-
421 if (QWidget::focusNextPrevChild(next)) {
QWidget::focus...revChild(next)Description
TRUEnever evaluated
FALSEnever evaluated
0
422 if (QWidget *fw = focusWidget())
QWidget *fw = focusWidget()Description
TRUEnever evaluated
FALSEnever evaluated
0
423 ensureWidgetVisible(fw);
never executed: ensureWidgetVisible(fw);
0
424 return true;
never executed: return true;
0
425 }-
426 return false;
never executed: return false;
0
427}-
428-
429/*!-
430 Scrolls the contents of the scroll area so that the point (\a x, \a y) is visible-
431 inside the region of the viewport with margins specified in pixels by \a xmargin and-
432 \a ymargin. If the specified point cannot be reached, the contents are scrolled to-
433 the nearest valid position. The default value for both margins is 50 pixels.-
434*/-
435void QScrollArea::ensureVisible(int x, int y, int xmargin, int ymargin)-
436{-
437 Q_D(QScrollArea);-
438-
439 int logicalX = QStyle::visualPos(layoutDirection(), d->viewport->rect(), QPoint(x, y)).x();-
440-
441 if (logicalX - xmargin < d->hbar->value()) {
logicalX - xma...>hbar->value()Description
TRUEnever evaluated
FALSEnever evaluated
0
442 d->hbar->setValue(qMax(0, logicalX - xmargin));-
443 } else if (logicalX > d->hbar->value() + d->viewport->width() - xmargin) {
never executed: end of block
logicalX > d->...th() - xmarginDescription
TRUEnever evaluated
FALSEnever evaluated
0
444 d->hbar->setValue(qMin(logicalX - d->viewport->width() + xmargin, d->hbar->maximum()));-
445 }
never executed: end of block
0
446-
447 if (y - ymargin < d->vbar->value()) {
y - ymargin < d->vbar->value()Description
TRUEnever evaluated
FALSEnever evaluated
0
448 d->vbar->setValue(qMax(0, y - ymargin));-
449 } 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
450 d->vbar->setValue(qMin(y - d->viewport->height() + ymargin, d->vbar->maximum()));-
451 }
never executed: end of block
0
452}
never executed: end of block
0
453-
454/*!-
455 \since 4.2-
456-
457 Scrolls the contents of the scroll area so that the \a childWidget-
458 of QScrollArea::widget() is visible inside the viewport with-
459 margins specified in pixels by \a xmargin and \a ymargin. If the-
460 specified point cannot be reached, the contents are scrolled to-
461 the nearest valid position. The default value for both margins is-
462 50 pixels.-
463-
464*/-
465void QScrollArea::ensureWidgetVisible(QWidget *childWidget, int xmargin, int ymargin)-
466{-
467 Q_D(QScrollArea);-
468-
469 if (!d->widget->isAncestorOf(childWidget))
!d->widget->is...f(childWidget)Description
TRUEnever evaluated
FALSEnever evaluated
0
470 return;
never executed: return;
0
471-
472 const QRect microFocus = childWidget->inputMethodQuery(Qt::ImCursorRectangle).toRect();-
473 const QRect defaultMicroFocus =-
474 childWidget->QWidget::inputMethodQuery(Qt::ImCursorRectangle).toRect();-
475 QRect focusRect = (microFocus != defaultMicroFocus)
(microFocus !=...ultMicroFocus)Description
TRUEnever evaluated
FALSEnever evaluated
0
476 ? QRect(childWidget->mapTo(d->widget, microFocus.topLeft()), microFocus.size())-
477 : QRect(childWidget->mapTo(d->widget, QPoint(0,0)), childWidget->size());-
478 const QRect visibleRect(-d->widget->pos(), d->viewport->size());-
479-
480 if (visibleRect.contains(focusRect))
visibleRect.co...ins(focusRect)Description
TRUEnever evaluated
FALSEnever evaluated
0
481 return;
never executed: return;
0
482-
483 focusRect.adjust(-xmargin, -ymargin, xmargin, ymargin);-
484-
485 if (focusRect.width() > visibleRect.width())
focusRect.widt...leRect.width()Description
TRUEnever evaluated
FALSEnever evaluated
0
486 d->hbar->setValue(focusRect.center().x() - d->viewport->width() / 2);
never executed: d->hbar->setValue(focusRect.center().x() - d->viewport->width() / 2);
0
487 else if (focusRect.right() > visibleRect.right())
focusRect.righ...leRect.right()Description
TRUEnever evaluated
FALSEnever evaluated
0
488 d->hbar->setValue(focusRect.right() - d->viewport->width());
never executed: d->hbar->setValue(focusRect.right() - d->viewport->width());
0
489 else if (focusRect.left() < visibleRect.left())
focusRect.left...bleRect.left()Description
TRUEnever evaluated
FALSEnever evaluated
0
490 d->hbar->setValue(focusRect.left());
never executed: d->hbar->setValue(focusRect.left());
0
491-
492 if (focusRect.height() > visibleRect.height())
focusRect.heig...eRect.height()Description
TRUEnever evaluated
FALSEnever evaluated
0
493 d->vbar->setValue(focusRect.center().y() - d->viewport->height() / 2);
never executed: d->vbar->setValue(focusRect.center().y() - d->viewport->height() / 2);
0
494 else if (focusRect.bottom() > visibleRect.bottom())
focusRect.bott...eRect.bottom()Description
TRUEnever evaluated
FALSEnever evaluated
0
495 d->vbar->setValue(focusRect.bottom() - d->viewport->height());
never executed: d->vbar->setValue(focusRect.bottom() - d->viewport->height());
0
496 else if (focusRect.top() < visibleRect.top())
focusRect.top(...ibleRect.top()Description
TRUEnever evaluated
FALSEnever evaluated
0
497 d->vbar->setValue(focusRect.top());
never executed: d->vbar->setValue(focusRect.top());
0
498}
never executed: end of block
0
499-
500-
501/*!-
502 \property QScrollArea::alignment-
503 \brief the alignment of the scroll area's widget-
504 \since 4.2-
505-
506 A valid alignment is a combination of the following flags:-
507 \list-
508 \li \c Qt::AlignLeft-
509 \li \c Qt::AlignHCenter-
510 \li \c Qt::AlignRight-
511 \li \c Qt::AlignTop-
512 \li \c Qt::AlignVCenter-
513 \li \c Qt::AlignBottom-
514 \endlist-
515 By default, the widget stays rooted to the top-left corner of the-
516 scroll area.-
517*/-
518-
519void QScrollArea::setAlignment(Qt::Alignment alignment)-
520{-
521 Q_D(QScrollArea);-
522 d->alignment = alignment;-
523 if (d->widget)
d->widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
524 d->updateWidgetPosition();
never executed: d->updateWidgetPosition();
0
525}
never executed: end of block
0
526-
527Qt::Alignment QScrollArea::alignment() const-
528{-
529 Q_D(const QScrollArea);-
530 return d->alignment;
never executed: return d->alignment;
0
531}-
532-
533QT_END_NAMESPACE-
534-
535#include "moc_qscrollarea.cpp"-
536-
537#endif // QT_NO_SCROLLAREA-
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