Resize MDI subwindows

[8Observer8]

Hi,

I want to resize subwindows of simple MDI application:


#include "MainWindow.h"
#include "ui_MainWindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

m_firstWindow = new FirstWindow;
m_secondWindow = new SecondWindow;
m_thirdWindow = new ThirdWindow;

m_firstWindow->resize( 500, 500 );

ui->mdiArea->addSubWindow( m_firstWindow );
ui->mdiArea->addSubWindow( m_secondWindow );
ui->mdiArea->addSubWindow( m_thirdWindow );
}

MainWindow::~MainWindow()
{
delete ui;
}


But it doesn't work:
10559

It is the project: https://github.com/8Observer8/SimpleMDIApplication

Thank you!

[ChrisW67]

If you want to resize the MdiSubWindow then you should call resize() on that object, not the widget it contains:


#include "MainWindow.h"
#include "ui_MainWindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

m_firstWindow = new FirstWindow;
m_secondWindow = new SecondWindow;
m_thirdWindow = new ThirdWindow;

QMdiSubWindow *w1 = ui->mdiArea->addSubWindow( m_firstWindow );
ui->mdiArea->addSubWindow( m_secondWindow );
ui->mdiArea->addSubWindow( m_thirdWindow );

w1->resize( 500, 500 );
}


If your widgets actually contained anything then the containing QMdiSubWindow would get a preferred size from the layout and you probably would not need to resize at all.

[8Observer8]

Thank you very much :)

[8Observer8]

I've created my first useful MDI application :D

Matrix Operations

10563

Source code: https://github.com/8Observer8/MatrixOperations

[8Observer8]

When I run my MDI application I see:
10564

But I want to see:
10565

Source code: https://github.com/8Observer8/SingleTriangleEditor

How will I be able to do it? Where can I read about layout the MdiSubWindows on the mdiArea?

Thank you!

[anda_skoa]

MDI sub windows are basically like windows, they are not layouted among themselved other than the simple things that QMdiArea::WindowOrder does.

Which is one of the reasons why this sort of MDI applications is not used very often anymore.

Cheers,
_

[ChrisW67]

There are also tileSubwindows() and cascadeSubWindows() slots to arrange the windows. If you want a layout that is generally fixed then you are better off doing that yourself with a layout inside a widget rather than with QMdiArea.

[anda_skoa]

Agreed.
The screenshot does not look like multiple documents at all, more like a single document and editing tool.

Which would more likely be served better by using QDockWidget

Cheers,
_