Ensure ListView contentHeight is set to a valid size.

If the view height is 0 no items will be created so the contentHeight
can not be estimated.  The currentItem is usually created,
so it is possible to use that to estimate.

Task-number: QTBUG-16037
Reviewed-by: Bea Lam

2 files changed, 57 insertions, 0 deletions

diff --git a/tests/auto/declarative/qdeclarativelistview/data/qtbug16037.qml b/tests/auto/declarative/qdeclarativelistview/data/qtbug16037.qml
new file mode 100644
index 0000000..0756618
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelistview/data/qtbug16037.qml
@@ -0,0 +1,37 @@
+import QtQuick 1.0
+
+Item {
+    width: 640
+    height: 480
+
+    function setModel() {
+        listView.model = listModel1
+    }
+
+    ListModel {
+        id: listModel1
+        ListElement { text: "Apple" }
+        ListElement { text: "Banana" }
+        ListElement { text: "Orange" }
+        ListElement { text: "Coconut" }
+    }
+
+    Rectangle {
+        width: 200
+        height: listView.contentHeight
+        color: "yellow"
+        anchors.centerIn: parent
+
+        ListView {
+            id: listView
+            objectName: "listview"
+            anchors.fill: parent
+
+            delegate: Item {
+                width: 200
+                height: 20
+                Text { text: model.text; anchors.centerIn: parent }
+            }
+        }
+    }
+}
diff --git a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
index ff90d32..b834d46 100644
--- a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
+++ b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
@@ -104,6 +104,7 @@ private slots:
     void sizeLessThan1();
     void QTBUG_14821();
     void resizeDelegate();
+    void QTBUG_16037();
 
 private:
     template <class T> void items();
@@ -1944,6 +1945,25 @@ void tst_QDeclarativeListView::resizeDelegate()
     delete canvas;
 }
 
+void tst_QDeclarativeListView::QTBUG_16037()
+{
+    QDeclarativeView *canvas = createView();
+
+    canvas->setSource(QUrl::fromLocalFile(SRCDIR "/data/qtbug16037.qml"));
+    qApp->processEvents();
+
+    QDeclarativeListView *listview = findItem<QDeclarativeListView>(canvas->rootObject(), "listview");
+    QTRY_VERIFY(listview != 0);
+
+    QVERIFY(listview->contentHeight() <= 0.0);
+
+    QMetaObject::invokeMethod(canvas->rootObject(), "setModel");
+
+    QTRY_COMPARE(listview->contentHeight(), 80.0);
+
+    delete canvas;
+}
+
 void tst_QDeclarativeListView::qListModelInterface_items()
 {
     items<TestModel>();