QTfrontend/drawmapwidget.h
author koda
Sun, 19 Jun 2011 12:34:54 +0200
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passing by reference... my darkest enemy actual reason below: In your case (without reference) the compiler generates a temporary object (int) for the first argument of your MyApplication constructor. You pass this temporary int to QApplication’s constructor (with int reference), which saves the address of this reference. Once your MyApplication constructor is done the temporary int is destroyed but QApplication still has its address.
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2011 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#ifndef DRAWMAPWIDGET_H
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#define DRAWMAPWIDGET_H
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#include <QWidget>
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#include <QHBoxLayout>
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#include <QPushButton>
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#include <QGraphicsView>
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#include "qaspectratiolayout.h"
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#include "drawmapscene.h"
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namespace Ui {
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    class Ui_DrawMapWidget
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    {
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    public:
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        QGraphicsView *graphicsView;
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        void setupUi(QWidget *drawMapWidget)
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        {
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            QAspectRatioLayout * arLayout = new QAspectRatioLayout(drawMapWidget);
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            arLayout->setMargin(0);
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            graphicsView = new QGraphicsView(drawMapWidget);
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            arLayout->addWidget(graphicsView);
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            retranslateUi(drawMapWidget);
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            QMetaObject::connectSlotsByName(drawMapWidget);
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        } // setupUi
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        void retranslateUi(QWidget *drawMapWidget)
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        {
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            Q_UNUSED(drawMapWidget);
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        } // retranslateUi
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    };
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    class DrawMapWidget: public Ui_DrawMapWidget {};
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}
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class DrawMapWidget : public QWidget
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{
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    Q_OBJECT
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public:
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    explicit DrawMapWidget(QWidget *parent = 0);
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    ~DrawMapWidget();
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    void setScene(DrawMapScene * scene);
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public slots:
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    void undo();
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    void clear();
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    void save(const QString & fileName);
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    void load(const QString & fileName);
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protected:
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    void changeEvent(QEvent *e);
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    virtual void resizeEvent(QResizeEvent * event);
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    virtual void showEvent(QShowEvent * event);
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private:
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    Ui::DrawMapWidget *ui;
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    DrawMapScene * m_scene;
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};
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#endif // DRAWMAPWIDGET_H