| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, 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 The Qt Company Ltd 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 "diagramscene.h" |
| #include "arrow.h" |
| |
| #include <QGraphicsSceneMouseEvent> |
| #include <QTextCursor> |
| |
| //! [0] |
| DiagramScene::DiagramScene(QMenu *itemMenu, QObject *parent) |
| : QGraphicsScene(parent) |
| { |
| myItemMenu = itemMenu; |
| myMode = MoveItem; |
| myItemType = DiagramItem::Step; |
| line = nullptr; |
| textItem = nullptr; |
| 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, &DiagramTextItem::lostFocus, |
| this, &DiagramScene::editorLostFocus); |
| connect(textItem, &DiagramTextItem::selectedChange, |
| this, &DiagramScene::itemSelected); |
| 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 != nullptr) { |
| 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 != nullptr && 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 = nullptr; |
| QGraphicsScene::mouseReleaseEvent(mouseEvent); |
| } |
| //! [13] |
| |
| //! [14] |
| bool DiagramScene::isItemChange(int type) const |
| { |
| const QList<QGraphicsItem *> items = selectedItems(); |
| const auto cb = [type](const QGraphicsItem *item) { return item->type() == type; }; |
| return std::find_if(items.begin(), items.end(), cb) != items.end(); |
| } |
| //! [14] |