Add displayMarginBeginning/End to ListView and GridView.

This allows displaying content outside the visible area of
the view.

[ChangeLog][QtQuick] Add displayMarginBeginning/End to
ListView and GridView.

Change-Id: Idf9b5a0cd34a781c9603a9ad98ea189754972ba1
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/auto/quick/qquicklistview/tst_qquicklistview.cpp b/tests/auto/quick/qquicklistview/tst_qquicklistview.cpp
index fb0b1c95ca..c3a5c64ba1 100644
--- a/tests/auto/quick/qquicklistview/tst_qquicklistview.cpp
+++ b/tests/auto/quick/qquicklistview/tst_qquicklistview.cpp
@@ -215,6 +215,7 @@ private slots:
     void testProxyModelChangedAfterMove();
 
     void typedModel();
+    void displayMargin();
 
 private:
     template <class T> void items(const QUrl &source);
@@ -7010,6 +7011,43 @@ void tst_QQuickListView::typedModel()
     QCOMPARE(listview->count(), 0);
 }
 
+void tst_QQuickListView::displayMargin()
+{
+    QQuickView *window = createView();
+    window->setSource(testFileUrl("displayMargin.qml"));
+    window->show();
+    QVERIFY(QTest::qWaitForWindowExposed(window));
+
+    QQuickListView *listview = window->rootObject()->findChild<QQuickListView*>();
+    QVERIFY(listview != 0);
+
+    QQuickItem *content = listview->contentItem();
+    QVERIFY(content != 0);
+
+    QQuickItem *item0;
+    QQuickItem *item14;
+
+    QVERIFY(item0 = findItem<QQuickItem>(content, "delegate", 0));
+    QCOMPARE(delegateVisible(item0), true);
+
+    // the 14th item should be within the end margin
+    QVERIFY(item14 = findItem<QQuickItem>(content, "delegate", 13));
+    QCOMPARE(delegateVisible(item14), true);
+
+    // the 15th item should be outside the end margin
+    QVERIFY(findItem<QQuickItem>(content, "delegate", 14) == 0);
+
+    // the first delegate should still be within the begin margin
+    listview->positionViewAtIndex(3, QQuickListView::Beginning);
+    QCOMPARE(delegateVisible(item0), true);
+
+    // the first delegate should now be outside the begin margin
+    listview->positionViewAtIndex(4, QQuickListView::Beginning);
+    QCOMPARE(delegateVisible(item0), false);
+
+    delete window;
+}
+
 QTEST_MAIN(tst_QQuickListView)
 
 #include "tst_qquicklistview.moc"