<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.3: diagramscene.cpp Example File (graphicsview/diagramscene/diagramscene.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">diagramscene.cpp Example File<br /><sup><sup>graphicsview/diagramscene/diagramscene.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.1, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If ** you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech, as the sole ** copyright holder for Qt Designer, grants users of the Qt/Eclipse ** Integration plug-in the right for the Qt/Eclipse Integration to ** link to functionality provided by Qt Designer and its related ** libraries. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly ** granted herein. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/</span> #include <QtGui> #include "diagramscene.h" #include "arrow.h" 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; } void DiagramScene::setLineColor(const QColor &color) { myLineColor = color; if (isItemChange(Arrow::Type)) { Arrow *item = qgraphicsitem_cast<Arrow *>(selectedItems().first()); item->setColor(myLineColor); update(); } } void DiagramScene::setTextColor(const QColor &color) { myTextColor = color; if (isItemChange(DiagramTextItem::Type)) { DiagramTextItem *item = qgraphicsitem_cast<DiagramTextItem *>(selectedItems().first()); item->setDefaultTextColor(myTextColor); } } void DiagramScene::setItemColor(const QColor &color) { myItemColor = color; if (isItemChange(DiagramItem::Type)) { DiagramItem *item = qgraphicsitem_cast<DiagramItem *>(selectedItems().first()); item->setBrush(myItemColor); } } void DiagramScene::setFont(const QFont &font) { myFont = font; if (isItemChange(DiagramTextItem::Type)) { QGraphicsTextItem *item = qgraphicsitem_cast<DiagramTextItem *>(selectedItems().first()); item->setFont(myFont); } } void DiagramScene::setMode(Mode mode) { myMode = mode; } void DiagramScene::setItemType(DiagramItem::DiagramType type) { myItemType = type; } void DiagramScene::editorLostFocus(DiagramTextItem *item) { QTextCursor cursor = item->textCursor(); cursor.clearSelection(); item->setTextCursor(cursor); if (item->toPlainText().isEmpty()) { removeItem(item); item->deleteLater(); } } 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; case InsertLine: line = new QGraphicsLineItem(QLineF(mouseEvent->scenePos(), mouseEvent->scenePos())); line->setPen(QPen(myLineColor, 2)); addItem(line); break; 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); default: ; } QGraphicsScene::mousePressEvent(mouseEvent); } 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); } } 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; 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(); } } line = 0; QGraphicsScene::mouseReleaseEvent(mouseEvent); } bool DiagramScene::isItemChange(int type) { foreach (QGraphicsItem *item, selectedItems()) { if (item->type() == type) return true; } return false; }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2008 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.3.4</div></td> </tr></table></div></address></body> </html>