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error nodesEditor' was not declared in this scope?



  • i defined a class name nodesEditor,i added heaer file qnodeseditor.h to mainwindow:(the header file and source.cpp in /path source)
    this my main windows source:

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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    **
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    **   * Redistributions of source code must retain the above copyright
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    **     of its contributors may be used to endorse or promote products derived
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    #include "arrow.h"
    #include "diagramitem.h"
    #include "diagramscene.h"
    #include "diagramtextitem.h"
    #include "mainwindow.h"
    
    #include <QtWidgets>
    ///////////////
    #include <qmessagebox.h>
    #include <QInputDialog>
    
    ////////////////////////
    #include "qnemainwindow.h"
    #include "ui_qnemainwindow.h"
    
    #include "qneblock.h"
    #include "qnodeseditor.h"
    
    #include <QGraphicsScene>
    #include <QFileDialog>
    
    #include "qneport.h"
    
    
    /////////////////////
    
    const int InsertTextButton = 10;
    
    //! [0]
    MainWindow::MainWindow()
    {/*QMessageBox msgBox;
        msgBox.setText("The document has been modified.");
        msgBox.exec();*/
    
        /////////////////////////////////////
      nodesEditor= new QNodesEditor(this);
    
        QAction *quitAct = new QAction(tr("&Quit"), this);
        quitAct->setShortcuts(QKeySequence::Quit);
        quitAct->setStatusTip(tr("Quit the application"));
        connect(quitAct, SIGNAL(triggered()), qApp, SLOT(quit()));
    
        QAction *loadAct = new QAction(tr("&Load"), this);
        loadAct->setShortcuts(QKeySequence::Open);
        loadAct->setStatusTip(tr("Open a file"));
        connect(loadAct, SIGNAL(triggered()), this, SLOT(loadFile()));
    
        QAction *saveAct = new QAction(tr("&Save"), this);
        saveAct->setShortcuts(QKeySequence::Save);
        saveAct->setStatusTip(tr("Save a file"));
        connect(saveAct, SIGNAL(triggered()), this, SLOT(saveFile()));
    
        QAction *addAct = new QAction(tr("&Add"), this);
        addAct->setStatusTip(tr("Add a block"));
        connect(addAct, SIGNAL(triggered()), this, SLOT(addBlock()));
    
        fileMenu = menuBar()->addMenu(tr("&File"));
        fileMenu->addAction(addAct);
        fileMenu->addAction(loadAct);
        fileMenu->addAction(saveAct);
        fileMenu->addSeparator();
        fileMenu->addAction(quitAct);
    
        setWindowTitle(tr("Node Editor"));
    
    
        /// ////////////////////////////////////////////////
    
    
       createActions();
       createToolBox();
       createMenus();
    
        scene = new DiagramScene(itemMenu, this);
        scene->setSceneRect(QRectF(0, 0, 5000, 5000));
        connect(scene, SIGNAL(itemInserted(DiagramItem*)),
                this, SLOT(itemInserted(DiagramItem*)));
        connect(scene, SIGNAL(textInserted(QGraphicsTextItem*)),
                this, SLOT(textInserted(QGraphicsTextItem*)));
        connect(scene, SIGNAL(itemSelected(QGraphicsItem*)),
                this, SLOT(itemSelected(QGraphicsItem*)));
        createToolbars();
    
        QHBoxLayout *layout = new QHBoxLayout;
        layout->addWidget(toolBox);
        view = new QGraphicsView(scene);
        layout->addWidget(view);
    
        QWidget *widget = new QWidget;
        widget->setLayout(layout);
    
    
        setCentralWidget(widget);
        setWindowTitle(tr("DataFlow"));
        setUnifiedTitleAndToolBarOnMac(true);
    }
    //! [0]
    
    //! [1]
    void MainWindow::backgroundButtonGroupClicked(QAbstractButton *button)
    {
        QList<QAbstractButton *> buttons = backgroundButtonGroup->buttons();
        foreach (QAbstractButton *myButton, buttons) {
            if (myButton != button)
                button->setChecked(false);
        }
        QString text = button->text();
        if (text == tr("Blue Grid"))
            scene->setBackgroundBrush(QPixmap(":/images/background1.png"));
        else if (text == tr("White Grid"))
            scene->setBackgroundBrush(QPixmap(":/images/background2.png"));
        else if (text == tr("Gray Grid"))
            scene->setBackgroundBrush(QPixmap(":/images/background3.png"));
        else
            scene->setBackgroundBrush(QPixmap(":/images/background4.png"));
    
        scene->update();
        view->update();
    }
    //! [1]
    
    //! [2]
    void MainWindow::buttonGroupClicked(int id)
    {
        QList<QAbstractButton *> buttons = buttonGroup->buttons();
        foreach (QAbstractButton *button, buttons) {
            if (buttonGroup->button(id) != button)
                button->setChecked(false);
        }
        if (id == InsertTextButton) {
            scene->setMode(DiagramScene::InsertText);
        } else {
            scene->setItemType(DiagramItem::DiagramType(id));
            scene->setMode(DiagramScene::InsertItem);
        }
    }
    //! [2]
    
    //! [3]
    void MainWindow::deleteItem()
    {
        foreach (QGraphicsItem *item, scene->selectedItems()) {
            if (item->type() == Arrow::Type) {
                scene->removeItem(item);
                Arrow *arrow = qgraphicsitem_cast<Arrow *>(item);
                arrow->startItem()->removeArrow(arrow);
                arrow->endItem()->removeArrow(arrow);
                delete item;
            }
        }
    
        foreach (QGraphicsItem *item, scene->selectedItems()) {
             if (item->type() == DiagramItem::Type)
                 qgraphicsitem_cast<DiagramItem *>(item)->removeArrows();
             scene->removeItem(item);
             delete item;
         }
    }
    //! [3]
    
    //! [4]
    void MainWindow::pointerGroupClicked(int)
    {
        scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
    }
    //! [4]
    
    //! [5]
    void MainWindow::bringToFront()
    {
        if (scene->selectedItems().isEmpty())
            return;
    
        QGraphicsItem *selectedItem = scene->selectedItems().first();
        QList<QGraphicsItem *> overlapItems = selectedItem->collidingItems();
    
        qreal zValue = 0;
        foreach (QGraphicsItem *item, overlapItems) {
            if (item->zValue() >= zValue && item->type() == DiagramItem::Type)
                zValue = item->zValue() + 0.1;
        }
        selectedItem->setZValue(zValue);
    }
    
    //! [5]
    //! //////////////
    void MainWindow::propertySet(){
        if (scene->selectedItems().isEmpty())
            return;
            QMessageBox msgBox;
            msgBox.setText("please enter your property");
            msgBox.exec();
                bool ok;
               QString text = QInputDialog::getText(this, tr("Properties Window"),
                                                    tr("User name:"),QLineEdit::Normal,
                                                    QDir::home().dirName(), &ok);
                  QString text2 = QInputDialog::getMultiLineText(this, tr("QInputDialog::getMultiLineText()"),
                                                                tr("Address:"), "John Doe\nFreedom Street", &ok);
                  QStringList items;
                     items << tr("Spring") << tr("Summer") << tr("Fall") << tr("Winter");
    
    
                     QString item = QInputDialog::getItem(this, tr("QInputDialog::getItem()"),
                                                          tr("Season:"), items, 0, false, &ok);
    
    }
    //! ////////////
    
    //! [6]
    void MainWindow::sendToBack()
    {
        if (scene->selectedItems().isEmpty())
            return;
    
        QGraphicsItem *selectedItem = scene->selectedItems().first();
        QList<QGraphicsItem *> overlapItems = selectedItem->collidingItems();
    
        qreal zValue = 0;
        foreach (QGraphicsItem *item, overlapItems) {
            if (item->zValue() <= zValue && item->type() == DiagramItem::Type)
                zValue = item->zValue() - 0.1;
        }
        selectedItem->setZValue(zValue);
    }
    //! [6]
    
    //! [7]
    void MainWindow::itemInserted(DiagramItem *item)
    {
        pointerTypeGroup->button(int(DiagramScene::MoveItem))->setChecked(true);
        scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
        buttonGroup->button(int(item->diagramType()))->setChecked(false);
    }
    //! [7]
    
    //! [8]
    void MainWindow::textInserted(QGraphicsTextItem *)
    {
        buttonGroup->button(InsertTextButton)->setChecked(false);
        scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
    }
    //! [8]
    
    //! [9]
    void MainWindow::currentFontChanged(const QFont &)
    {
        handleFontChange();
    }
    //! [9]
    
    //! [10]
    void MainWindow::fontSizeChanged(const QString &)
    {
        handleFontChange();
    }
    //! [10]
    
    //! [11]
    void MainWindow::sceneScaleChanged(const QString &scale)
    {
        double newScale = scale.left(scale.indexOf(tr("%"))).toDouble() / 100.0;
        QMatrix oldMatrix = view->matrix();
        view->resetMatrix();
        view->translate(oldMatrix.dx(), oldMatrix.dy());
        view->scale(newScale, newScale);
    }
    //! [11]
    
    //! [12]
    void MainWindow::textColorChanged()
    {
        textAction = qobject_cast<QAction *>(sender());
        fontColorToolButton->setIcon(createColorToolButtonIcon(
                                         ":/images/textpointer.png",
                                         qvariant_cast<QColor>(textAction->data())));
        textButtonTriggered();
    }
    //! [12]
    
    //! [13]
    void MainWindow::itemColorChanged()
    {
        fillAction = qobject_cast<QAction *>(sender());
        fillColorToolButton->setIcon(createColorToolButtonIcon(
                                         ":/images/floodfill.png",
                                         qvariant_cast<QColor>(fillAction->data())));
        fillButtonTriggered();
    }
    //! [13]
    
    //! [14]
    void MainWindow::lineColorChanged()
    {
        lineAction = qobject_cast<QAction *>(sender());
        lineColorToolButton->setIcon(createColorToolButtonIcon(
                                         ":/images/linecolor.png",
                                         qvariant_cast<QColor>(lineAction->data())));
        lineButtonTriggered();
    }
    //! [14]
    
    //! [15]
    void MainWindow::textButtonTriggered()
    {
        scene->setTextColor(qvariant_cast<QColor>(textAction->data()));
    }
    //! [15]
    
    //! [16]
    void MainWindow::fillButtonTriggered()
    {
        scene->setItemColor(qvariant_cast<QColor>(fillAction->data()));
    }
    //! [16]
    
    //! [17]
    void MainWindow::lineButtonTriggered()
    {
        scene->setLineColor(qvariant_cast<QColor>(lineAction->data()));
    }
    //! [17]
    
    //! [18]
    void MainWindow::handleFontChange()
    {
        QFont font = fontCombo->currentFont();
        font.setPointSize(fontSizeCombo->currentText().toInt());
        font.setWeight(boldAction->isChecked() ? QFont::Bold : QFont::Normal);
        font.setItalic(italicAction->isChecked());
        font.setUnderline(underlineAction->isChecked());
    
        scene->setFont(font);
    }
    //! [18]
    
    //! [19]
    void MainWindow::itemSelected(QGraphicsItem *item)
    {
        DiagramTextItem *textItem =
        qgraphicsitem_cast<DiagramTextItem *>(item);
    
        QFont font = textItem->font();
        fontCombo->setCurrentFont(font);
        fontSizeCombo->setEditText(QString().setNum(font.pointSize()));
        boldAction->setChecked(font.weight() == QFont::Bold);
        italicAction->setChecked(font.italic());
        underlineAction->setChecked(font.underline());
    }
    //! [19]
    
    //! [20]
    void MainWindow::about()
    {
        QMessageBox::about(this, tr("About Diagram Scene"),
                           tr("The <b>Diagram Scene</b> example shows "
                              "use of the graphics framework."));
    }
    //! [20]
    
    //! [21]
    void MainWindow::createToolBox()
    {
        buttonGroup = new QButtonGroup(this);
        buttonGroup->setExclusive(false);
        connect(buttonGroup, SIGNAL(buttonClicked(int)),
                this, SLOT(buttonGroupClicked(int)));
        QGridLayout *layout = new QGridLayout;
        layout->addWidget(createCellWidget(tr("Conditional"), DiagramItem::Conditional), 0, 0);
        layout->addWidget(createCellWidget(tr("Process"), DiagramItem::Step),0, 1);
        layout->addWidget(createCellWidget(tr("Input/Output"), DiagramItem::Io), 1, 0);
        layout->addWidget(createCellWidget(tr("myobject "), DiagramItem::Conditional),2, 1);
        layout->addWidget(createCellWidget(tr("myobject "), DiagramItem::Conditional),3, 0);
    
    
    //! [21]
    
        QToolButton *textButton = new QToolButton;
        textButton->setCheckable(true);
        buttonGroup->addButton(textButton, InsertTextButton);
        textButton->setIcon(QIcon(QPixmap(":/images/textpointer.png")));
        textButton->setIconSize(QSize(50, 50));
        QGridLayout *textLayout = new QGridLayout;
        textLayout->addWidget(textButton, 0, 0, Qt::AlignHCenter);
        textLayout->addWidget(new QLabel(tr("Text")), 1, 0, Qt::AlignCenter);
        QWidget *textWidget = new QWidget;
        textWidget->setLayout(textLayout);
        layout->addWidget(textWidget, 1, 1);
    
        layout->setRowStretch(3, 10);
        layout->setColumnStretch(2, 10);
    
        QWidget *itemWidget = new QWidget;
        itemWidget->setLayout(layout);
    
        backgroundButtonGroup = new QButtonGroup(this);
        connect(backgroundButtonGroup, SIGNAL(buttonClicked(QAbstractButton*)),
                this, SLOT(backgroundButtonGroupClicked(QAbstractButton*)));
    
        QGridLayout *backgroundLayout = new QGridLayout;
        backgroundLayout->addWidget(createBackgroundCellWidget(tr("Blue Grid"),
                                                               ":/images/background1.png"), 0, 0);
        backgroundLayout->addWidget(createBackgroundCellWidget(tr("White Grid"),
                                                               ":/images/background2.png"), 0, 1);
        backgroundLayout->addWidget(createBackgroundCellWidget(tr("Gray Grid"),
                                                               ":/images/background3.png"), 1, 0);
        backgroundLayout->addWidget(createBackgroundCellWidget(tr("No Grid"),
                                                               ":/images/background4.png"), 1, 1);
    
        backgroundLayout->setRowStretch(2, 10);
        backgroundLayout->setColumnStretch(2, 10);
    
        QWidget *backgroundWidget = new QWidget;
        backgroundWidget->setLayout(backgroundLayout);
    
    
    //! [22]
        toolBox = new QToolBox;
        toolBox->setSizePolicy(QSizePolicy(QSizePolicy::Maximum, QSizePolicy::Ignored));
        toolBox->setMinimumWidth(itemWidget->sizeHint().width());
        toolBox->addItem(itemWidget, tr("Basic Flowchart Shapes"));
        toolBox->addItem(backgroundWidget, tr("Backgrounds"));
    }
    //! [22]
    
    //! [23]
    void MainWindow::createActions()
    {
        toFrontAction = new QAction(QIcon(":/images/bringtofront.png"),
                                    tr("Bring to &Front"), this);
        toFrontAction->setShortcut(tr("Ctrl+F"));
        toFrontAction->setStatusTip(tr("Bring item to front"));
        connect(toFrontAction, SIGNAL(triggered()), this, SLOT(bringToFront()));
    //! [23]
    //! /////////////////
        propertiesAction= new QAction(QIcon(":/images/bringtofront.png"), tr("Properties"), this);
        propertiesAction->setShortcut(tr("Ctrl+P"));
          propertiesAction->setStatusTip(tr("Properties"));
        connect( propertiesAction, SIGNAL(triggered()), this, SLOT(propertySet()));
    //! [23]
    //!
    //! //////////////////
    
        sendBackAction = new QAction(QIcon(":/images/sendtoback.png"), tr("Send to &Back"), this);
        sendBackAction->setShortcut(tr("Ctrl+B"));
        sendBackAction->setStatusTip(tr("Send item to back"));
        connect(sendBackAction, SIGNAL(triggered()), this, SLOT(sendToBack()));
    
        deleteAction = new QAction(QIcon(":/images/delete.png"), tr("&Delete"), this);
        deleteAction->setShortcut(tr("Delete"));
        deleteAction->setStatusTip(tr("Delete item from diagram"));
        connect(deleteAction, SIGNAL(triggered()), this, SLOT(deleteItem()));
    
        exitAction = new QAction(tr("E&xit"), this);
        exitAction->setShortcuts(QKeySequence::Quit);
        exitAction->setStatusTip(tr("Quit Scenediagram example"));
        connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));
    
        boldAction = new QAction(tr("Bold"), this);
        boldAction->setCheckable(true);
        QPixmap pixmap(":/images/bold.png");
        boldAction->setIcon(QIcon(pixmap));
        boldAction->setShortcut(tr("Ctrl+B"));
        connect(boldAction, SIGNAL(triggered()), this, SLOT(handleFontChange()));
    
        italicAction = new QAction(QIcon(":/images/italic.png"), tr("Italic"), this);
        italicAction->setCheckable(true);
        italicAction->setShortcut(tr("Ctrl+I"));
        connect(italicAction, SIGNAL(triggered()), this, SLOT(handleFontChange()));
    
        underlineAction = new QAction(QIcon(":/images/underline.png"), tr("Underline"), this);
        underlineAction->setCheckable(true);
        underlineAction->setShortcut(tr("Ctrl+U"));
        connect(underlineAction, SIGNAL(triggered()), this, SLOT(handleFontChange()));
    
        aboutAction = new QAction(tr("A&bout"), this);
        aboutAction->setShortcut(tr("Ctrl+B"));
        connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));
    }
    
    //! [24]
    void MainWindow::createMenus()
    {
        fileMenu = menuBar()->addMenu(tr("&File"));
        fileMenu->addAction(exitAction);
    
        itemMenu = menuBar()->addMenu(tr("&Item"));
        itemMenu->addAction(deleteAction);
        itemMenu->addSeparator();
        itemMenu->addAction(toFrontAction);
        itemMenu->addAction(sendBackAction);
        itemMenu->addAction(propertiesAction);
    
    
        aboutMenu = menuBar()->addMenu(tr("&Help"));
        aboutMenu->addAction(aboutAction);
    }
    //! [24]
    
    //! [25]
    void MainWindow::createToolbars()
    {
    //! [25]
        editToolBar = addToolBar(tr("Edit"));
        editToolBar->addAction(deleteAction);
        editToolBar->addAction(toFrontAction);
        editToolBar->addAction(sendBackAction);
        editToolBar->addAction( propertiesAction);
    
    
        fontCombo = new QFontComboBox();
        connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
                this, SLOT(currentFontChanged(QFont)));
    
        fontSizeCombo = new QComboBox;
        fontSizeCombo->setEditable(true);
        for (int i = 8; i < 30; i = i + 2)
            fontSizeCombo->addItem(QString().setNum(i));
        QIntValidator *validator = new QIntValidator(2, 64, this);
        fontSizeCombo->setValidator(validator);
        connect(fontSizeCombo, SIGNAL(currentIndexChanged(QString)),
                this, SLOT(fontSizeChanged(QString)));
    
        fontColorToolButton = new QToolButton;
        fontColorToolButton->setPopupMode(QToolButton::MenuButtonPopup);
        fontColorToolButton->setMenu(createColorMenu(SLOT(textColorChanged()), Qt::black));
        textAction = fontColorToolButton->menu()->defaultAction();
        fontColorToolButton->setIcon(createColorToolButtonIcon(":/images/textpointer.png", Qt::black));
        fontColorToolButton->setAutoFillBackground(true);
        connect(fontColorToolButton, SIGNAL(clicked()),
                this, SLOT(textButtonTriggered()));
    
    //! [26]
        fillColorToolButton = new QToolButton;
        fillColorToolButton->setPopupMode(QToolButton::MenuButtonPopup);
        fillColorToolButton->setMenu(createColorMenu(SLOT(itemColorChanged()), Qt::white));
        fillAction = fillColorToolButton->menu()->defaultAction();
        fillColorToolButton->setIcon(createColorToolButtonIcon(
                                         ":/images/floodfill.png", Qt::white));
        connect(fillColorToolButton, SIGNAL(clicked()),
                this, SLOT(fillButtonTriggered()));
    //! [26]
    
        lineColorToolButton = new QToolButton;
        lineColorToolButton->setPopupMode(QToolButton::MenuButtonPopup);
        lineColorToolButton->setMenu(createColorMenu(SLOT(lineColorChanged()), Qt::black));
        lineAction = lineColorToolButton->menu()->defaultAction();
        lineColorToolButton->setIcon(createColorToolButtonIcon(
                                         ":/images/linecolor.png", Qt::black));
        connect(lineColorToolButton, SIGNAL(clicked()),
                this, SLOT(lineButtonTriggered()));
    
        textToolBar = addToolBar(tr("Font"));
        textToolBar->addWidget(fontCombo);
        textToolBar->addWidget(fontSizeCombo);
        textToolBar->addAction(boldAction);
        textToolBar->addAction(italicAction);
        textToolBar->addAction(underlineAction);
    
        colorToolBar = addToolBar(tr("Color"));
        colorToolBar->addWidget(fontColorToolButton);
        colorToolBar->addWidget(fillColorToolButton);
        colorToolBar->addWidget(lineColorToolButton);
    
        QToolButton *pointerButton = new QToolButton;
        pointerButton->setCheckable(true);
        pointerButton->setChecked(true);
        pointerButton->setIcon(QIcon(":/images/pointer.png"));
        QToolButton *linePointerButton = new QToolButton;
        linePointerButton->setCheckable(true);
        linePointerButton->setIcon(QIcon(":/images/linepointer.png"));
    
        pointerTypeGroup = new QButtonGroup(this);
        pointerTypeGroup->addButton(pointerButton, int(DiagramScene::MoveItem));
        pointerTypeGroup->addButton(linePointerButton, int(DiagramScene::InsertLine));
        connect(pointerTypeGroup, SIGNAL(buttonClicked(int)),
                this, SLOT(pointerGroupClicked(int)));
    
        sceneScaleCombo = new QComboBox;
        QStringList scales;
        scales << tr("50%") << tr("75%") << tr("100%") << tr("125%") << tr("150%");
        sceneScaleCombo->addItems(scales);
        sceneScaleCombo->setCurrentIndex(2);
        connect(sceneScaleCombo, SIGNAL(currentIndexChanged(QString)),
                this, SLOT(sceneScaleChanged(QString)));
    
        pointerToolbar = addToolBar(tr("Pointer type"));
        pointerToolbar->addWidget(pointerButton);
        pointerToolbar->addWidget(linePointerButton);
        pointerToolbar->addWidget(sceneScaleCombo);
    //! [27]
    }
    //! [27]
    
    //! [28]
    QWidget *MainWindow::createBackgroundCellWidget(const QString &text, const QString &image)
    {
        QMessageBox msgBox;
            msgBox.setText("createBackgroundCellWidget");
            msgBox.exec();
    
    
        QToolButton *button = new QToolButton;
        button->setText(text);
        button->setIcon(QIcon(image));
        button->setIconSize(QSize(50, 50));
        button->setCheckable(true);
        backgroundButtonGroup->addButton(button);
    
        QGridLayout *layout = new QGridLayout;
        layout->addWidget(button, 0, 0, Qt::AlignHCenter);
        layout->addWidget(new QLabel(text), 1, 0, Qt::AlignCenter);
    
        QWidget *widget = new QWidget;
        widget->setLayout(layout);
    
        return widget;
    }
    //! [28]
    
    //! [29]
    QWidget *MainWindow::createCellWidget(const QString &text, DiagramItem::DiagramType type)
    {    QMessageBox msgBox;
         msgBox.setText("createCellWidget");
         msgBox.exec();
    
    
        DiagramItem item(type, itemMenu);
        QIcon icon(item.image());
    
        QToolButton *button = new QToolButton;
        button->setIcon(icon);
        button->setIconSize(QSize(50, 50));
        button->setCheckable(true);
        buttonGroup->addButton(button, int(type));
    
        QGridLayout *layout = new QGridLayout;
        layout->addWidget(button, 0, 0, Qt::AlignHCenter);
        layout->addWidget(new QLabel(text), 1, 0, Qt::AlignCenter);
    
        QWidget *widget = new QWidget;
        widget->setLayout(layout);
    
        return widget;
    }
    //! [29]
    
    //! [30]
    QMenu *MainWindow::createColorMenu(const char *slot, QColor defaultColor)
    {
        QList<QColor> colors;
        colors << Qt::black << Qt::white << Qt::red << Qt::blue << Qt::yellow;
        QStringList names;
        names << tr("black") << tr("white") << tr("red") << tr("blue")
              << tr("yellow");
    
        QMenu *colorMenu = new QMenu(this);
        for (int i = 0; i < colors.count(); ++i) {
            QAction *action = new QAction(names.at(i), this);
            action->setData(colors.at(i));
            action->setIcon(createColorIcon(colors.at(i)));
            connect(action, SIGNAL(triggered()), this, slot);
            colorMenu->addAction(action);
            if (colors.at(i) == defaultColor)
                colorMenu->setDefaultAction(action);
        }
        return colorMenu;
    }
    //! [30]
    
    //! [31]
    QIcon MainWindow::createColorToolButtonIcon(const QString &imageFile, QColor color)
    {
    
    
        QPixmap pixmap(50, 80);
        pixmap.fill(Qt::transparent);
        QPainter painter(&pixmap);
        QPixmap image(imageFile);
        // Draw icon centred horizontally on button.
        QRect target(4, 0, 42, 43);
        QRect source(0, 0, 42, 43);
        painter.fillRect(QRect(0, 60, 50, 80), color);
        painter.drawPixmap(target, image, source);
    
        return QIcon(pixmap);
    }
    //! [31]
    
    //! [32]
    QIcon MainWindow::createColorIcon(QColor color)
    {
        QPixmap pixmap(20, 20);
        QPainter painter(&pixmap);
        painter.setPen(Qt::NoPen);
        painter.fillRect(QRect(0, 0, 20, 20), color);
    
        return QIcon(pixmap);
    }
    //! [32]
    

    this has errors:please help me
    F:\Users\ROOT\Desktop\newpro\newpro\mainwindow.cpp:76: error: 'nodesEditor' was not declared in this scope
    nodesEditor = new QNodesEditor();

    thanks for reply



  • @stackprogramer said:

    nodesEditor= new QNodesEditor(this);

    From the snippet you gave us we have to assume that nodeEditor is a member of MainWindow. How did you declare it?



  • @JohanSolo i have a question,if this class it not member mainwindow,
    it should not work?why?
    i define class in header file qnodeseditor.
    why for some class that is defined in Qt,it not necessary is defined a member class mainwindow.

    thanks for reply



  • @stackprogramer said:

    @JohanSolo i have a question,if this class it not member mainwindow,
    it should not work?why?
    i define class in header file qnodeseditor.

    I understood you have a header defining the class QNodesEditor, but where is the instance nodesEditor defined?



  • @JohanSolo
    i now defined instance it .its works now thanks for reply.



  • @stackprogramer said:

    @JohanSolo
    i now defined its works now thanks for reply.

    I'm glad I could help, Please don't forget to mark the question as solved.


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