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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@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]