Models which load incrementally via fetchMore() don't work.

Call canFetchMore()/fetchMore() on setModel(), setRootIndex() and when
the last item is created.

Task-number: QTBUG-16039
Reviewed-by: Bea Lam

4 files changed, 187 insertions, 1 deletions

diff --git a/tests/auto/declarative/qdeclarativelistview/incrementalmodel.cpp b/tests/auto/declarative/qdeclarativelistview/incrementalmodel.cpp
new file mode 100644
index 0000000..b2c9df5
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelistview/incrementalmodel.cpp
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "incrementalmodel.h"
+#include <QApplication>
+#include <QDebug>
+
+IncrementalModel::IncrementalModel(QObject *parent)
+    : QAbstractListModel(parent), count(0)
+{
+    for (int i = 0; i < 100; ++i)
+        list.append("Item " + QString::number(i));
+}
+
+int IncrementalModel::rowCount(const QModelIndex & /* parent */) const
+{
+    return count;
+}
+
+QVariant IncrementalModel::data(const QModelIndex &index, int role) const
+{
+    if (!index.isValid())
+        return QVariant();
+    
+    if (index.row() >= list.size() || index.row() < 0)
+        return QVariant();
+    
+    if (role == Qt::DisplayRole)
+        return list.at(index.row());
+    return QVariant();
+}
+
+bool IncrementalModel::canFetchMore(const QModelIndex & /* index */) const
+{
+    if (count < list.size())
+        return true;
+    else
+        return false;
+}
+
+void IncrementalModel::fetchMore(const QModelIndex & /* index */)
+{
+    int remainder = list.size() - count;
+    int itemsToFetch = qMin(5, remainder);
+
+    beginInsertRows(QModelIndex(), count, count+itemsToFetch-1);
+    
+    count += itemsToFetch;
+
+    endInsertRows();
+}
diff --git a/tests/auto/declarative/qdeclarativelistview/incrementalmodel.h b/tests/auto/declarative/qdeclarativelistview/incrementalmodel.h
new file mode 100644
index 0000000..b1f7407
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelistview/incrementalmodel.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef IncrementalModel_H
+#define IncrementalModel_H
+
+#include <QAbstractListModel>
+#include <QList>
+#include <QStringList>
+
+class IncrementalModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    IncrementalModel(QObject *parent = 0);
+
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+
+protected:
+    bool canFetchMore(const QModelIndex &parent) const;
+    void fetchMore(const QModelIndex &parent);
+
+private:
+    QStringList list;
+    int count;
+};
+
+#endif
diff --git a/tests/auto/declarative/qdeclarativelistview/qdeclarativelistview.pro b/tests/auto/declarative/qdeclarativelistview/qdeclarativelistview.pro
index 2c5a859..8c99f08 100644
--- a/tests/auto/declarative/qdeclarativelistview/qdeclarativelistview.pro
+++ b/tests/auto/declarative/qdeclarativelistview/qdeclarativelistview.pro
@@ -2,7 +2,8 @@ load(qttest_p4)
 contains(QT_CONFIG,declarative): QT += declarative
 macx:CONFIG -= app_bundle
 
-SOURCES += tst_qdeclarativelistview.cpp
+HEADERS += incrementalmodel.h
+SOURCES += tst_qdeclarativelistview.cpp incrementalmodel.cpp
 
 symbian: {
     importFiles.sources = data
diff --git a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
index dba0cc4..e76cb15 100644
--- a/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
+++ b/tests/auto/declarative/qdeclarativelistview/tst_qdeclarativelistview.cpp
@@ -51,6 +51,7 @@
 #include <QtDeclarative/private/qdeclarativelistmodel_p.h>
 #include <QtDeclarative/private/qlistmodelinterface_p.h>
 #include "../../../shared/util.h"
+#include "incrementalmodel.h"
 
 #ifdef Q_OS_SYMBIAN
 // In Symbian OS test data is located in applications private dir
@@ -106,6 +107,7 @@ private slots:
     void resizeDelegate();
     void QTBUG_16037();
     void indexAt();
+    void incrementalModel();
 
 private:
     template <class T> void items();
@@ -1998,6 +2000,32 @@ void tst_QDeclarativeListView::indexAt()
     delete canvas;
 }
 
+void tst_QDeclarativeListView::incrementalModel()
+{
+    QDeclarativeView *canvas = createView();
+
+    IncrementalModel model;
+    QDeclarativeContext *ctxt = canvas->rootContext();
+    ctxt->setContextProperty("testModel", &model);
+
+    canvas->setSource(QUrl::fromLocalFile(SRCDIR "/data/displaylist.qml"));
+    qApp->processEvents();
+
+    QDeclarativeListView *listview = findItem<QDeclarativeListView>(canvas->rootObject(), "list");
+    QTRY_VERIFY(listview != 0);
+
+    QDeclarativeItem *contentItem = listview->contentItem();
+    QTRY_VERIFY(contentItem != 0);
+
+    QTRY_COMPARE(listview->count(), 20);
+
+    listview->positionViewAtIndex(10, QDeclarativeListView::Beginning);
+
+    QTRY_COMPARE(listview->count(), 25);
+
+    delete canvas;
+}
+
 void tst_QDeclarativeListView::qListModelInterface_items()
 {
     items<TestModel>();