QQuickItemView: Take sticky header/footer into account for positionViewAtIndex().

When using an overlaid header or footer, we must adjust the position we come up
with by the appropriate size in order to end up at the correct place.

Change-Id: I218b9aef7fdf37f56ffb63dc395f97045b55a186
Task-number: QTBUG-50097
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/auto/quick/qquicklistview/data/qtbug50097.qml b/tests/auto/quick/qquicklistview/data/qtbug50097.qml
new file mode 100644
index 0000000000..24d506b804
--- /dev/null
+++ b/tests/auto/quick/qquicklistview/data/qtbug50097.qml
@@ -0,0 +1,47 @@
+import QtQuick 2.6
+
+ListView {
+    id: lv
+
+    // How many rows per page
+    property int pageSize: 5
+
+    // The current page number
+    property int currentPage: 1
+
+    // How large a single item is
+    property int itemSize: 100
+
+    // Arbitrary
+    property int totalPages: 5
+
+    height: itemSize * pageSize // display one full page at a time
+    width: 500 // arbitrary.
+    model: pageSize * totalPages
+    delegate: Text {
+        height: itemSize
+        text: "Item " + (index + 1) + " of " + lv.count
+    }
+
+    // contentY should be < 0 to account for header visibility
+    onContentYChanged: console.log(contentY)
+
+    headerPositioning: ListView.OverlayHeader
+    header: Rectangle {
+        height: itemSize
+        width: 500
+        z: 1000
+        visible: false
+        color: "black"
+
+        Text {
+            anchors.centerIn: parent
+            color: "red"
+            text: "List header"
+        }
+    }
+
+    onCurrentPageChanged: {
+        lv.positionViewAtIndex((currentPage - 1) * pageSize, ListView.Beginning);
+    }
+}