Add support for filtering VisualDataModels.

Add a VisualDataGroup element which items within a VisualDataModel
can be assigned to. Setting the group property of a VisualDataModel
or one of its parts models will filter the items visible within a
view to just items belonging to that group.  By default all items
belong to an 'items' group.

The VisualDataModel attached object includes properties indicating
whether a item is a member of a group and its index in the group.

Task-number: QTBUG-21513 QTBUG-21515
Change-Id: If3df6a359a888a6f79923775d2f78076d5e7d2cf
Reviewed-on: http://codereview.qt-project.org/4115
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Martin Jones <martin.jones@nokia.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/doc/src/snippets/declarative/visualdatagroup.qml b/doc/src/snippets/declarative/visualdatagroup.qml
new file mode 100644
index 0000000000..feb41e27cb
--- /dev/null
+++ b/doc/src/snippets/declarative/visualdatagroup.qml
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+//![0]
+import QtQuick 2.0
+
+Rectangle {
+    width: 200; height: 100
+
+    VisualDataModel {
+        id: visualModel
+        model: ListModel {
+            ListElement { name: "Apple" }
+            ListElement { name: "Orange" }
+        }
+
+        groups: [
+            VisualDataGroup { name: "selected" }
+        ]
+
+        delegate: Rectangle {
+            id: item
+            height: 25
+            width: 200
+            Text {
+                text: {
+                    var text = "Name: " + name
+                    if (item.VisualDataModel.inSelected)
+                        text += " (" + item.VisualDataModel.selectedIndex + ")"
+                    return text;
+                }
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: item.VisualDataModel.inSelected = !item.VisualDataModel.inSelected
+            }
+        }
+    }
+
+    ListView {
+        anchors.fill: parent
+        model: visualModel
+    }
+}
+//![0]