How to take window from QWorkspace?

Hi,

I try to take window from QWorkspace. But it doesn't work:

Code:

---

m_tablePanel = (TabelPanel *)(workspace->windowList()).at(0);

---

Thank you!

Please define what you mean by "it doesn't work".

I cannot update my Plot.

Attachment 9452

I'm a little ashamed for my code. But this is my first MDI program.

There is a little code:

Code:

---

m_tablePanel = (TabelPanel *)(workspace->windowList()).at(0);
    m_plotPanel = (PlotPanel *)(workspace->windowList()).at(1);
 
    connect(m_tablePanel, SIGNAL(itemChanged(QStandardItem *)), this, SLOT(updatePanel(QStandardItem*)));

---

Code:

---

void MainWindow::updatePanel(QStandardItem *item)
{
    m_plotPanel->updatePanel(model);
}

---

Maybe you can't update your plot but it doesn't mean the method doesn't work. Especially that you have an ugly C cast instead of qobject_cast or something similar. How do you know that the first item in the list is an instance of TablePanel and the second one is an instance of PlotPanel?

I want to take instance of TablePanel and PlotPanel from workspace. I don't know how to do it.

It's doesn't work:

Code:

---

m_tablePanel = qobject_cast<TabelPanel *>((workspace->windowList()).at(0));
m_plotPanel = qobject_cast<PlotPanel *>((workspace->windowList()).at(1));

---

Quote:

---

Originally Posted by wysota

How do you know that the first item in the list is an instance of TablePanel and the second one is an instance of PlotPanel?

---

I added the Table then the Plot.

Code:

---

workspace->addWindow(tablePanel);
workspace->addWindow(plotPanel);

---

Slot of MainWindow updatePanel() doesn't work.

Code:

---

connect(m_tablePanel, SIGNAL(itemChanged(QStandardItem *)), this, SLOT(updatePanel(QStandardItem*)));

---

Quote:

---

Originally Posted by 8Observer8

I want to take instance of TablePanel and PlotPanel from workspace. I don't know how to do it.

It's doesn't work:

Code:

---

m_tablePanel = qobject_cast<TabelPanel *>((workspace->windowList()).at(0));
m_plotPanel = qobject_cast<PlotPanel *>((workspace->windowList()).at(1));

---

---

Define "doesn't work". Does the program crash or do you get a result different than what you expected to get?

Quote:

---

Slot of MainWindow updatePanel() doesn't work.

---

The slot doesn't get called or it behaves differently to what you expected?

I set a breakpoint in updatePanel() SLOT

Code:

---

void MainWindow::updatePanel(QStandardItem *item)
{
    m_plotPanel->updatePanel(model);
}

---

You set a breakpoint and?

Quote:

---

Originally Posted by wysota

You set a breakpoint and?

---

Then I change value in the table. But nothing happens.

Apparently your signal-slot connection is invalid.

TablePanel class is unlikely to have a signal itemChanged() carrying a QStandardItem pointer unless you added such signal to the class yourself.

Thanks! Now the breakpoint works.

Code:

---

connect(model, SIGNAL(itemChanged(QStandardItem *)), this, SLOT(updatePanel(QStandardItem*)));

---

But the Plot is not redrawn.

plotpanel.cpp

Code:

---

#include "plotpanel.h"
#include <QHBoxLayout>
#include <QDebug>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
 
PlotPanel::PlotPanel(QWidget *parent) :
    QDialog(parent)
{
    plot = new QwtPlot;
 
    QHBoxLayout *mainLayout = new QHBoxLayout;
 
    mainLayout->addWidget(plot);
 
    this->setLayout(mainLayout);
}
 
void PlotPanel::updatePanel(QStandardItemModel *model)
{
    plot->setAxisScale(QwtPlot::yLeft, 0.0, 10);
    plot->setAxisScale(QwtPlot::xBottom, 0.0, 10);
 
    QwtPlotCurve *curve = new QwtPlotCurve;
    curve->setTitle(tr("Points"));
    curve->setPen(QPen(Qt::blue, 4));
    curve->setRenderHint(QwtPlotItem::RenderAntialiased, true);
 
    QwtSymbol *symbol = new QwtSymbol(QwtSymbol::Ellipse, QBrush(Qt::yellow),
                                      QPen(Qt::red, 2), QSize(8, 8));
    curve->setSymbol(symbol);
 
    QPolygonF points;
 
    double x, y;
    for (int row = 0; row < model->rowCount(); row++) {
        QModelIndex index = model->index(row, 0);
        x = model->data(index).toDouble();
 
        index = model->index(row, 1);
        y = model->data(index).toDouble();
 
        points << QPointF(x, y);
    }
 
    curve->setSamples(points);
    curve->attach(plot);
 
//    this->update();
}

---

I don't see you calling replot() on the plot anywhere.

Thanks! Thanks! Thanks! :)

There is an another problem. I wanna see the new plot. How to delete the old plot?

Attachment 9458

Why not reuse the old curve instead?

Maybe I must delete the old curve? How to do it? I don't understand...

If you want to remove the old curve then detach it from the plot and delete it.

How to get the old curve?

You can store it in some member variable and then retrieve it later when you need it.

Nice! It works! Thank you much :)

Attachment 9459

This program is still left unfinished. But it may be useful for someone.

I made a loading (saving) table from (to) a xml-file:

Table.xml

Quote:

---

<Table nrows="5" ncols="2">
<point x="0.02" y="0.33"/>
<point x="0.56" y="1.12"/>
<point x="2.22" y="2.33"/>
<point x="6.23" y="4.87"/>
<point x="9.55" y="8.23"/>
</Table>

---

Attachment 9461

I replace QWorkspace -> QMdiArea

Code:

---

//workspace = new QWorkspace;
    mdiArea = new QMdiArea;
    //setCentralWidget( workspace );
    setCentralWidget( mdiArea );
 
    createActions();
    createMenus();
    createToolbars();
 
    showScenePanel();
    showControlPanel();
 
    scenePanel = new ScenePanel;
    //scenePanel = qobject_cast<ScenePanel *>((workspace->windowList()).at(0));
    scenePanel = qobject_cast<ScenePanel *>((mdiArea->subWindowList()).at(0));
    controlPanel = new ControlPanel;
    //controlPanel = qobject_cast<ControlPanel *>((workspace->windowList()).at(1));
    controlPanel = qobject_cast<ControlPanel *>((mdiArea->subWindowList()).at(1));
 
   scenePanel->setWindowIcon(QIcon(":/Icons/Scene.png")); // <---- RED LINE
    controlPanel->setWindowIcon(QIcon(":/Icons/Control.png"));

---

But the program crashes at run time (on the red line)

Comment lines #15 and #18 in the above code

I did it. The program isn't crushed.

But I see:

Attachment 9467

My Project:

Here is corrected code...

Code:

---

QList<QMdiSubWindow*> windows = mdi->subWindowList();
windows.at(0)->setWindowIcon(QIcon(":/Icons/Scene.png"));
windows.at(1)->setWindowIcon(QIcon(":/Icons/Control.png"));

---

I have ran it with "QWorkspase". It worked normally.

Quote:

---

Originally Posted by wysota

Code:

---

QList<QMdiSubWindow*> windows = mdi->subWindowList();
windows.at(0)->setWindowIcon(QIcon(":/Icons/Scene.png"));
windows.at(1)->setWindowIcon(QIcon(":/Icons/Control.png"));

---

---

Thanks! It works.

But program works illegal.

---

Added after 5 minutes:

How to do that:

Code:

---

scenePanel = qobject_cast<ScenePanel *>(windows.at(0));
controlPanel = qobject_cast<ControlPanel *>(windows.at(1));

---

Quote:

---

Originally Posted by Santosh Reddy

Here is corrected code...

---

Thank you very much :)

---

Added after 40 minutes:

In addition, instead:

Code:

---

scenePanel->resize(500, 500);

---

I wrote

Code:

---

sceneWindow->resize(500, 500);

---

Guys, thanks for help! I am happy :D

Quote:

---

Originally Posted by 8Observer8

How to do that:

Code:

---

scenePanel = qobject_cast<ScenePanel *>(windows.at(0));
controlPanel = qobject_cast<ControlPanel *>(windows.at(1));

---

---

This won't work because the returned widget is an instance of QMdiSubWindow and not your widget.

Santosh Reddy have corrected:

mainwindow.h

Code:

---

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "controlpanel.h"
#include "scenepanel.h"
 
class QAction;
class QMdiSubWindow;
class QMdiArea;
class QMenu;
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
 
signals:
 
public slots:
 
private:
    void createActions();
    void createMenus();
    void createToolbars();
 
    QMdiArea *mdiArea;
 
    QAction *sceneAction;
    QAction *controlAction;
 
    ScenePanel *scenePanel;
    ControlPanel *controlPanel;
 
    QMdiSubWindow * sceneWindow;
    QMdiSubWindow * controlWindow;
 
private slots:
    void showScenePanel();
    void showControlPanel();
};
 
#endif // MAINWINDOW_H

---

mainwindow.cpp

Code:

---

#include "mainwindow.h"
#include <QtGui>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    this->setWindowTitle(tr("mdiLine"));
    mdiArea = new QMdiArea;
    setCentralWidget( mdiArea );
 
    createActions();
    createMenus();
    createToolbars();
 
    scenePanel = new ScenePanel;
    scenePanel->setWindowIcon(QIcon(":/Icons/Scene.png"));
    sceneWindow = mdiArea->addSubWindow(scenePanel);
    sceneWindow->resize(500, 500);
 
    controlPanel = new ControlPanel;
    controlPanel->setWindowIcon(QIcon(":/Icons/Control.png"));
    controlWindow = mdiArea->addSubWindow(controlPanel);
 
    connect(controlPanel, SIGNAL(drawLine(QVector3D,QVector3D)), scenePanel, SLOT(drawLine(QVector3D,QVector3D)));
 
    showScenePanel();
    showControlPanel();
}
 
void MainWindow::createActions() {
    sceneAction = new QAction( QIcon(":/Icons/Scene.png"), tr("&Scene"), this );
    sceneAction->setStatusTip( tr("Scene Panel") );
    connect( sceneAction, SIGNAL(triggered()), this, SLOT(showScenePanel()) );
 
    controlAction = new QAction( QIcon(":/Icons/Control.png"), tr("&Control"), this );
    controlAction->setStatusTip( tr("Control Panel") );
    connect( controlAction, SIGNAL(triggered()), this, SLOT(showControlPanel()) );
}
 
void MainWindow::createMenus() {
    QMenu *menu;
    menu = menuBar()->addMenu( tr("&Panels") );
    menu->addAction( sceneAction );
    menu->addAction( controlAction );
}
 
void MainWindow::createToolbars() {
    QToolBar *toolbar;
 
    toolbar = addToolBar( tr("Panels") );
    toolbar->addAction( sceneAction );
    toolbar->addAction( controlAction );
}
 
void MainWindow::showScenePanel()
{
    sceneWindow->show();
}
 
void MainWindow::showControlPanel()
{
    controlWindow->show();
}

---