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Fix QScroller::scrollTo failing in QGraphicsView with movable item 

When forcing software scrolling through QScroller::scrollTo,
it will start from (0, 0). QGraphicsViewPrivate::canStartScrollingAt
should consider the locationof points, not just the flags of item.

Fixes: QTBUG-70255
Pick-to: 5.15 6.1 6.2
Change-Id: Iebdd5568baa3bdb41c705204dadb2895cfe9c0e2
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
bb10
ChunLin Wang 2021-08-17 20:07:31 +08:00 committed by Tor Arne Vestbø
parent b7150d22c8
commit 9ba4c6beef
2 changed files with 31 additions and 1 deletions
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2
src/widgets/graphicsview/qgraphicsview.cpp
View File

@ -614,7 +614,7 @@ bool QGraphicsViewPrivate::canStartScrollingAt(const QPoint &startPos) const
const QGraphicsItem *childItem = q->itemAt(startPos);
if (childItem && (childItem->flags() & QGraphicsItem::ItemIsMovable))
if (!startPos.isNull() && childItem && (childItem->flags() & QGraphicsItem::ItemIsMovable))
return false;
return QAbstractScrollAreaPrivate::canStartScrollingAt(startPos);

30
tests/auto/widgets/graphicsview/qgraphicsview/tst_qgraphicsview.cpp
View File

@ -50,6 +50,7 @@
#include <QtWidgets/QBoxLayout>
#include <QtWidgets/QStyle>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QScroller>
#if QT_CONFIG(opengl)
#include <QtOpenGLWidgets/QOpenGLWidget>
#endif
@ -266,6 +267,7 @@ private slots:
void QTBUG_5859_exposedRect();
void hoverLeave();
void QTBUG_16063_microFocusRect();
void QTBUG_70255_scrollTo();
#ifndef QT_NO_CURSOR
void QTBUG_7438_cursor();
#endif
@ -5020,5 +5022,33 @@ void tst_QGraphicsView::QTBUG_16063_microFocusRect()
QCOMPARE(mfv, IMItem::mf.translated(-view.mapToScene(view.sceneRect().toRect()).boundingRect().topLeft()));
}
void tst_QGraphicsView::QTBUG_70255_scrollTo()
{
QGraphicsView view;
QGraphicsScene scene;
view.setFixedSize(200, 200);
scene.setSceneRect(0, 0, 1000, 1000);
QGraphicsRectItem item;
item.setRect(-20, -20, 40, 40);
item.setFlag(QGraphicsItem::ItemIsMovable, true);
scene.addItem(&item);
view.setScene(&scene);
view.centerOn(0, 0);
view.show();
QApplication::setActiveWindow(&view);
if (!QTest::qWaitForWindowExposed(&view) || !QTest::qWaitForWindowActive(&view))
QSKIP("Failed to show and activate window");
QPoint point = view.mapFromScene(0, 0);
QCOMPARE(point, QPoint(0, 0));
QScroller::scroller(&view)->scrollTo(QPointF(0, 500), 100);
QTest::qWait(200);
point = view.mapFromScene(0, 0);
QCOMPARE(point, QPoint(0, -500));
}
QTEST_MAIN(tst_QGraphicsView)
#include "tst_qgraphicsview.moc"