--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/graphicsview/diagramscene/diagramscene.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,241 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples 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 <QtGui>
+
+#include "diagramscene.h"
+#include "arrow.h"
+
+//! [0]
+DiagramScene::DiagramScene(QMenu *itemMenu, QObject *parent)
+    : QGraphicsScene(parent)
+{
+    myItemMenu = itemMenu;
+    myMode = MoveItem;
+    myItemType = DiagramItem::Step;
+    line = 0;
+    textItem = 0;
+    myItemColor = Qt::white;
+    myTextColor = Qt::black;
+    myLineColor = Qt::black;
+}
+//! [0]
+
+//! [1]
+void DiagramScene::setLineColor(const QColor &color)
+{
+    myLineColor = color;
+    if (isItemChange(Arrow::Type)) {
+        Arrow *item =
+            qgraphicsitem_cast<Arrow *>(selectedItems().first());
+        item->setColor(myLineColor);
+        update();
+    }
+}
+//! [1]
+
+//! [2]
+void DiagramScene::setTextColor(const QColor &color)
+{
+    myTextColor = color;
+    if (isItemChange(DiagramTextItem::Type)) {
+        DiagramTextItem *item =
+            qgraphicsitem_cast<DiagramTextItem *>(selectedItems().first());
+        item->setDefaultTextColor(myTextColor);
+    }
+}
+//! [2]
+
+//! [3]
+void DiagramScene::setItemColor(const QColor &color)
+{
+    myItemColor = color;
+    if (isItemChange(DiagramItem::Type)) {
+        DiagramItem *item =
+            qgraphicsitem_cast<DiagramItem *>(selectedItems().first());
+        item->setBrush(myItemColor);
+    }
+}
+//! [3]
+
+//! [4]
+void DiagramScene::setFont(const QFont &font)
+{
+    myFont = font;
+
+    if (isItemChange(DiagramTextItem::Type)) {
+        QGraphicsTextItem *item =
+            qgraphicsitem_cast<DiagramTextItem *>(selectedItems().first());
+        //At this point the selection can change so the first selected item might not be a DiagramTextItem
+        if (item)
+            item->setFont(myFont);
+    }
+}
+//! [4]
+
+void DiagramScene::setMode(Mode mode)
+{
+    myMode = mode;
+}
+
+void DiagramScene::setItemType(DiagramItem::DiagramType type)
+{
+    myItemType = type;
+}
+
+//! [5]
+void DiagramScene::editorLostFocus(DiagramTextItem *item)
+{
+    QTextCursor cursor = item->textCursor();
+    cursor.clearSelection();
+    item->setTextCursor(cursor);
+
+    if (item->toPlainText().isEmpty()) {
+        removeItem(item);
+        item->deleteLater();
+    }
+}
+//! [5]
+
+//! [6]
+void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    if (mouseEvent->button() != Qt::LeftButton)
+        return;
+
+    DiagramItem *item;
+    switch (myMode) {
+        case InsertItem:
+            item = new DiagramItem(myItemType, myItemMenu);
+            item->setBrush(myItemColor);
+            addItem(item);
+            item->setPos(mouseEvent->scenePos());
+            emit itemInserted(item);
+            break;
+//! [6] //! [7]
+        case InsertLine:
+            line = new QGraphicsLineItem(QLineF(mouseEvent->scenePos(),
+                                        mouseEvent->scenePos()));
+            line->setPen(QPen(myLineColor, 2));
+            addItem(line);
+            break;
+//! [7] //! [8]
+        case InsertText:
+            textItem = new DiagramTextItem();
+            textItem->setFont(myFont);
+            textItem->setTextInteractionFlags(Qt::TextEditorInteraction);
+            textItem->setZValue(1000.0);
+            connect(textItem, SIGNAL(lostFocus(DiagramTextItem *)),
+                    this, SLOT(editorLostFocus(DiagramTextItem *)));
+            connect(textItem, SIGNAL(selectedChange(QGraphicsItem *)),
+                    this, SIGNAL(itemSelected(QGraphicsItem *)));
+            addItem(textItem);
+            textItem->setDefaultTextColor(myTextColor);
+            textItem->setPos(mouseEvent->scenePos());
+            emit textInserted(textItem);
+//! [8] //! [9]
+    default:
+        ;
+    }
+    QGraphicsScene::mousePressEvent(mouseEvent);
+}
+//! [9]
+
+//! [10]
+void DiagramScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    if (myMode == InsertLine && line != 0) {
+        QLineF newLine(line->line().p1(), mouseEvent->scenePos());
+        line->setLine(newLine);
+    } else if (myMode == MoveItem) {
+        QGraphicsScene::mouseMoveEvent(mouseEvent);
+    }
+}
+//! [10]
+
+//! [11]
+void DiagramScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    if (line != 0 && myMode == InsertLine) {
+        QList<QGraphicsItem *> startItems = items(line->line().p1());
+        if (startItems.count() && startItems.first() == line)
+            startItems.removeFirst();
+        QList<QGraphicsItem *> endItems = items(line->line().p2());
+        if (endItems.count() && endItems.first() == line)
+            endItems.removeFirst();
+
+        removeItem(line);
+        delete line;
+//! [11] //! [12]
+
+        if (startItems.count() > 0 && endItems.count() > 0 &&
+            startItems.first()->type() == DiagramItem::Type &&
+            endItems.first()->type() == DiagramItem::Type &&
+            startItems.first() != endItems.first()) {
+            DiagramItem *startItem =
+                qgraphicsitem_cast<DiagramItem *>(startItems.first());
+            DiagramItem *endItem =
+                qgraphicsitem_cast<DiagramItem *>(endItems.first());
+            Arrow *arrow = new Arrow(startItem, endItem);
+            arrow->setColor(myLineColor);
+            startItem->addArrow(arrow);
+            endItem->addArrow(arrow);
+            arrow->setZValue(-1000.0);
+            addItem(arrow);
+            arrow->updatePosition();
+        }
+    }
+//! [12] //! [13]
+    line = 0;
+    QGraphicsScene::mouseReleaseEvent(mouseEvent);
+}
+//! [13]
+
+//! [14]
+bool DiagramScene::isItemChange(int type)
+{
+    foreach (QGraphicsItem *item, selectedItems()) {
+        if (item->type() == type)
+            return true;
+    }
+    return false;
+}
+//! [14]