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Diffstat (limited to 'examples/graphicsview/diagramscene/diagramscene.cpp')
| -rw-r--r-- | examples/graphicsview/diagramscene/diagramscene.cpp | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/examples/graphicsview/diagramscene/diagramscene.cpp b/examples/graphicsview/diagramscene/diagramscene.cpp new file mode 100644 index 0000000000..7592224db7 --- /dev/null +++ b/examples/graphicsview/diagramscene/diagramscene.cpp @@ -0,0 +1,240 @@ +/**************************************************************************** +** +** 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 examples 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." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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] |