How to take window from QWorkspace?

Hi,

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

Code:

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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:

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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:

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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?

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I added the Table then the Plot.

Code:

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

---

Slot of MainWindow updatePanel() doesn't work.

Code:

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

---

Quote:

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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:

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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:

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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:

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

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But the Plot is not redrawn.

plotpanel.cpp

Code:

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#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();
}

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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>

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Attachment 9461