Qt custom slot does not work

[GG2013]

Put the graph widget and table widget into a QStackedWidget, which is the central widget of the QMainWindow, and have your menu actions switch between the two pages in the stack.

Thank you for your reply. Do you mind giving me at bit more details (I am really new to Qt/Qwt/NightCharts). If you look at my code earlier I have used plotData() (a data plot with Qwt) and paint() (a pie chart with NightCharts) as two slots which are to be activated with two different menu-clicks.
Thank you for your time.

[GG2013]

Hallo All,
I still could not figure out the above. In brief, I have 2 menu actions, for ex. Total Traffic & Network Layer- please see attached figure. The first one will trigger plotData() that draws a plot (Bandwidth Graph), and the second one will trigger a pie chart. The problem is that the pie chart is always shown behind the plot.

As suggested by @ChrisW67 I tried to implement but still no luck.

screen.jpg

[wysota]

You are painting on the wrong widget.

[GG2013]

You are painting on the wrong widget.

Thank you for your reply. Could you please write me a bit details...I don't get it.

[wysota]

Your screenshot looks like you have a widget in your main window which is some kind of chart and at the same time you are trying to paint another chart directly in the main window widget itself. Since the first chart is a child widget of the main window, its contents will always be above the contents of the main window. Note that I'm basing my thoughts only on the screenshot as you didn't share any meaningful code with us.

[GG2013]

Your screenshot looks like you have a widget in your main window which is some kind of chart and at the same time you are trying to paint another chart directly in the main window widget itself. Since the first chart is a child widget of the main window, its contents will always be above the contents of the main window. Note that I'm basing my thoughts only on the screenshot as you didn't share any meaningful code with us.

Thank you for your reply. You are right- both are basically drawn on main window. But I still can't figure out how to access the widget for NightCharts (it's a class) (please see the code below) so that it can be added in QStackedWidget.


In mainwindow.cpp:
[code]
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
........
stackedWidget = new QStackedWidget;
stackedWidget->addWidget(widget1);//here goes Qwt plot widget
stackedWidget->addWidget(widget2); //here goes pie chart widget
......
}

void MainWindow::paintEvent(QPaintEvent *e)
{
QWidget::paintEvent(e);
QPainter painter;
QFont font;
painter.begin(this);
Nightcharts PieChart;
PieChart.setType(Nightcharts::Dpie);//{Histogramm,Pie,DPie};
PieChart.setLegendType(Nightcharts::Vertical);//{Round,Vertical}
PieChart.setCords(100,100,this->width()/1.5,this->height()/1.5);
PieChart.addPiece("Item1",QColor(200,10,50),34);
PieChart.addPiece("Item2",Qt::green,27);
PieChart.addPiece("Item3",Qt::cyan,14);
PieChart.addPiece("Item4",Qt::yellow,7);
PieChart.addPiece("Item5",Qt::blue,4);
PieChart.draw(&painter);
PieChart.drawLegend(&painter);
}

void MainWindow::paintEvent(QPaintEvent *e)
{
QWidget::paintEvent(e);
QPainter painter;
QFont font;
painter.begin(this);
Nightcharts PieChart;
PieChart.setType(Nightcharts::Dpie);//{Histogramm,Pie,DPie};
PieChart.setLegendType(Nightcharts::Vertical);//{Round,Vertical}
PieChart.setCords(100,100,this->width()/1.5,this->height()/1.5);
PieChart.addPiece("Item1",QColor(200,10,50),34);
PieChart.addPiece("Item2",Qt::green,27);
PieChart.addPiece("Item3",Qt::cyan,14);
PieChart.addPiece("Item4",Qt::yellow,7);
PieChart.addPiece("Item5",Qt::blue,4);
PieChart.draw(&painter);
PieChart.drawLegend(&painter);
}

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[anda_skoa]

Why on earth are you overriding MainWindow:aintEvent()?

Cheers,
_

[GG2013]

Finally I got it right...Thank you everybody who helped me to resolve this.