QAbstractItemView: add iconSizeChanged signal.

This is useful when writing a generic preview-icon-generator which
should work with different type of views, itemviews and QML views.
A way to be notified of a change of icon size was missing on the itemview side.

[ChangeLog][QtWidgets][QAbstractItemView] Added iconSizeChanged signal.

Change-Id: I19b3049961002ca27d71aefbb6980d1e6f225c79
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/auto/widgets/itemviews/qabstractitemview/tst_qabstractitemview.cpp b/tests/auto/widgets/itemviews/qabstractitemview/tst_qabstractitemview.cpp
index 237d4f8a29..1be597cb7c 100644
--- a/tests/auto/widgets/itemviews/qabstractitemview/tst_qabstractitemview.cpp
+++ b/tests/auto/widgets/itemviews/qabstractitemview/tst_qabstractitemview.cpp
@@ -526,11 +526,16 @@ void tst_QAbstractItemView::basic_tests(TestView *view)
     // setIconSize
     view->setIconSize(QSize(16, 16));
     QCOMPARE(view->iconSize(), QSize(16, 16));
+    QSignalSpy spy(view, &QAbstractItemView::iconSizeChanged);
+    QVERIFY(spy.isValid());
     view->setIconSize(QSize(32, 32));
     QCOMPARE(view->iconSize(), QSize(32, 32));
+    QCOMPARE(spy.count(), 1);
+    QCOMPARE(spy.at(0).at(0).value<QSize>(), QSize(32, 32));
     // Should this happen?
     view->setIconSize(QSize(-1, -1));
     QCOMPARE(view->iconSize(), QSize(-1, -1));
+    QCOMPARE(spy.count(), 2);
 
     QCOMPARE(view->currentIndex(), QModelIndex());
     QCOMPARE(view->rootIndex(), QModelIndex());