QGAL: default spacing can be unset using a negative value

After a default spacing is set through QGAL::setSpacing() family
of methods, the user must be able to unset it.

To avoid adding another public method, we enabled this feature
by allowing a negative value to be passed to those methods.

Signed-off-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>
Reviewed-by: Anselmo Lacerda S. de Melo <anselmo.melo@openbossa.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/auto/qgraphicsanchorlayout/tst_qgraphicsanchorlayout.cpp b/tests/auto/qgraphicsanchorlayout/tst_qgraphicsanchorlayout.cpp
index e2f87b8..aa67ac5 100644
--- a/tests/auto/qgraphicsanchorlayout/tst_qgraphicsanchorlayout.cpp
+++ b/tests/auto/qgraphicsanchorlayout/tst_qgraphicsanchorlayout.cpp
@@ -88,6 +88,7 @@ private slots:
     void spacingPersistency();
     void snakeParallelWithLayout();
     void parallelToHalfLayout();
+    void globalSpacing();
 };
 
 class RectWidget : public QGraphicsWidget
@@ -1976,5 +1977,45 @@ void tst_QGraphicsAnchorLayout::parallelToHalfLayout()
     QCOMPARE(maximumSizeHint, QSizeF(400, 100) + overhead);
 }
 
+void tst_QGraphicsAnchorLayout::globalSpacing()
+{
+    QGraphicsWidget *a = createItem();
+    QGraphicsWidget *b = createItem();
+
+    QGraphicsWidget w;
+    QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout(&w);
+
+    l->addCornerAnchors(l, Qt::TopLeftCorner, a, Qt::TopLeftCorner);
+    l->addCornerAnchors(a, Qt::BottomRightCorner, b, Qt::TopLeftCorner);
+    l->addCornerAnchors(b, Qt::BottomRightCorner, l, Qt::BottomRightCorner);
+
+    w.resize(w.effectiveSizeHint(Qt::PreferredSize));
+    qreal vSpacing = b->geometry().top() - a->geometry().bottom();
+    qreal hSpacing = b->geometry().left() - a->geometry().right();
+
+    // Set spacings manually
+    l->setVerticalSpacing(vSpacing + 10);
+    l->setHorizontalSpacing(hSpacing + 5);
+
+    w.resize(w.effectiveSizeHint(Qt::PreferredSize));
+    qreal newVSpacing = b->geometry().top() - a->geometry().bottom();
+    qreal newHSpacing = b->geometry().left() - a->geometry().right();
+
+    QCOMPARE(newVSpacing, vSpacing + 10);
+    QCOMPARE(newHSpacing, hSpacing + 5);
+
+    // Set a negative spacing. This will unset the previous spacing and
+    // bring back the widget-defined spacing.
+    l->setSpacing(-1);
+
+    w.resize(w.effectiveSizeHint(Qt::PreferredSize));
+    newVSpacing = b->geometry().top() - a->geometry().bottom();
+    newHSpacing = b->geometry().left() - a->geometry().right();
+
+    QCOMPARE(newVSpacing, vSpacing);
+    QCOMPARE(newHSpacing, hSpacing);
+}
+
+
 QTEST_MAIN(tst_QGraphicsAnchorLayout)
 #include "tst_qgraphicsanchorlayout.moc"