Fix GridView to repaint when geometry changes

Task-number: QTBUG-22078
Change-Id: Ic0ad67832dad9a7b3a7e5501893befe2d30b6c94
Reviewed-by: Bea Lam <bea.lam@nokia.com>

2 files changed, 56 insertions, 0 deletions

diff --git a/tests/auto/declarative/qsglistview/data/resizeview.qml b/tests/auto/declarative/qsglistview/data/resizeview.qml
new file mode 100644
index 0000000000..071cdedf2e
--- /dev/null
+++ b/tests/auto/declarative/qsglistview/data/resizeview.qml
@@ -0,0 +1,22 @@
+import QtQuick 2.0
+
+Rectangle {
+    id: root
+
+    property real initialHeight
+
+    ListView {
+        id: list
+        objectName: "list"
+        width: 240
+        height: initialHeight
+        model: testModel
+        delegate: Rectangle {
+            objectName: "wrapper"
+            width: 240
+            height: 20
+            border.width: 1
+        }
+    }
+}
+
diff --git a/tests/auto/declarative/qsglistview/tst_qsglistview.cpp b/tests/auto/declarative/qsglistview/tst_qsglistview.cpp
index 1b5a8b2a4c..fc1b7551ed 100644
--- a/tests/auto/declarative/qsglistview/tst_qsglistview.cpp
+++ b/tests/auto/declarative/qsglistview/tst_qsglistview.cpp
@@ -125,6 +125,7 @@ private slots:
     void footer_data();
     void headerFooter();
     void resizeView();
+    void resizeViewAndRepaint();
     void sizeLessThan1();
     void QTBUG_14821();
     void resizeDelegate();
@@ -3257,6 +3258,39 @@ void tst_QSGListView::resizeView()
     delete testObject;
 }
 
+void tst_QSGListView::resizeViewAndRepaint()
+{
+    QSGView *canvas = createView();
+    canvas->show();
+
+    TestModel model;
+    for (int i = 0; i < 40; i++)
+        model.addItem("Item" + QString::number(i), "");
+
+    QDeclarativeContext *ctxt = canvas->rootContext();
+    ctxt->setContextProperty("testModel", &model);
+    ctxt->setContextProperty("initialHeight", 100);
+
+    canvas->setSource(QUrl::fromLocalFile(TESTDATA("resizeview.qml")));
+    qApp->processEvents();
+
+    QSGListView *listview = findItem<QSGListView>(canvas->rootObject(), "list");
+    QTRY_VERIFY(listview != 0);
+    QSGItem *contentItem = listview->contentItem();
+    QTRY_VERIFY(contentItem != 0);
+
+    // item at index 10 should not be currently visible
+    QVERIFY(!findItem<QSGItem>(contentItem, "wrapper", 10));
+
+    listview->setHeight(320);
+    QTRY_VERIFY(findItem<QSGItem>(contentItem, "wrapper", 10));
+
+    listview->setHeight(100);
+    QTRY_VERIFY(!findItem<QSGItem>(contentItem, "wrapper", 10));
+
+    delete canvas;
+}
+
 void tst_QSGListView::sizeLessThan1()
 {
     QSGView *canvas = createView();