Fix consistency of setting currentIndex in ListView and GridView.

The behaviour of setting the currentIndex out of bounds, was different
depending upon whether it was set -ve, beyond the end, or before
component completed.  The behaviour is now consistent - setting the
currentIndex out of bounds is allowed and will cause the currentItem
and highlightItem to become null.

Task-number: QTBUG-12571
Reviewed-by: Michael Brasser

2 files changed, 94 insertions, 0 deletions

diff --git a/tests/auto/declarative/qdeclarativelistview/data/listview-noCurrent.qml b/tests/auto/declarative/qdeclarativelistview/data/listview-noCurrent.qml
new file mode 100644
index 0000000..1997010
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelistview/data/listview-noCurrent.qml
@@ -0,0 +1,50 @@
+import QtQuick 1.0
+
+Rectangle {
+    property int current: list.currentIndex
+    width: 240
+    height: 320
+    color: "#ffffff"
+    resources: [
+        Component {
+            id: myDelegate
+            Rectangle {
+                id: wrapper
+                objectName: "wrapper"
+                height: 20
+                width: 240
+                Text {
+                    text: index
+                }
+                Text {
+                    x: 30
+                    id: textName
+                    objectName: "textName"
+                    text: name
+                }
+                Text {
+                    x: 120
+                    id: textNumber
+                    objectName: "textNumber"
+                    text: number
+                }
+                Text {
+                    x: 200
+                    text: wrapper.y
+                }
+                color: ListView.isCurrentItem ? "lightsteelblue" : "white"
+            }
+        }
+    ]
+    ListView {
+        id: list
+        objectName: "list"
+        focus: true
+        currentIndex: -1
+        width: 240
+        height: 320
+        delegate: myDelegate
+        highlightMoveSpeed: 1000
+        model: testModel
+    }
+}
diff --git a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
index 2649c0d..080631c 100644
--- a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
+++ b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
@@ -85,6 +85,7 @@ private slots:
 
     void itemList();
     void currentIndex();
+    void noCurrentIndex();
     void enforceRange();
     void spacing();
     void sections();
@@ -1087,9 +1088,52 @@ void tst_QDeclarativeListView::currentIndex()
     model.insertItem(0, "Foo", "1111");
     QTRY_COMPARE(canvas->rootObject()->property("current").toInt(), 29);
 
+    // check removing highlight by setting currentIndex to -1;
+    listview->setCurrentIndex(-1);
+
+    QCOMPARE(listview->currentIndex(), -1);
+    QVERIFY(!listview->highlightItem());
+    QVERIFY(!listview->currentItem());
+
     delete canvas;
 }
 
+void tst_QDeclarativeListView::noCurrentIndex()
+{
+    TestModel model;
+    for (int i = 0; i < 30; i++)
+        model.addItem("Item" + QString::number(i), QString::number(i));
+
+    QDeclarativeView *canvas = new QDeclarativeView(0);
+    canvas->setFixedSize(240,320);
+
+    QDeclarativeContext *ctxt = canvas->rootContext();
+    ctxt->setContextProperty("testModel", &model);
+
+    QString filename(SRCDIR "/data/listview-noCurrent.qml");
+    canvas->setSource(QUrl::fromLocalFile(filename));
+
+    qApp->processEvents();
+
+    QDeclarativeListView *listview = findItem<QDeclarativeListView>(canvas->rootObject(), "list");
+    QTRY_VERIFY(listview != 0);
+
+    QDeclarativeItem *contentItem = listview->contentItem();
+    QTRY_VERIFY(contentItem != 0);
+
+    // current index should be -1 at startup
+    // and we should not have a currentItem or highlightItem
+    QCOMPARE(listview->currentIndex(), -1);
+    QCOMPARE(listview->contentY(), 0.0);
+    QVERIFY(!listview->highlightItem());
+    QVERIFY(!listview->currentItem());
+
+    listview->setCurrentIndex(2);
+    QCOMPARE(listview->currentIndex(), 2);
+    QVERIFY(listview->highlightItem());
+    QVERIFY(listview->currentItem());
+}
+
 void tst_QDeclarativeListView::itemList()
 {
     QDeclarativeView *canvas = createView();