Centre the form when maximised

[premroxx]

Hi,
I have a form that is roughly half the width of the screen. By default, When the exe screen is maximised the form gets aligned to the left side of the screen. What i want to do is to make it appear in the centre Untitled.jpg How can i do that? Thanks

[ChrisW67]

Use a layout, because at the moment it doesn't look like your main window has a layout applied.

[premroxx]

What you see is just a begin screen. I have lots of labels, texboxes & comboxes etc in the form. To add a layout at this point might a bit tedious. Is there anyway i can change it through coding.

[ChrisW67]

Sure, you can capture the QWidget::resizeEvent() of the main window, manually recalculate the size and location of each widget, and manually set their geometry. This is generally considered tedious, which is why layout engines exist.

How have you built the form? Designer or in code?

[premroxx]

I have built the form using designer. I have a series of labels & textboxes & images on top of each other. I display them based on conditions. Because the images and the widgets are on top of each other its kinda difficult to use layout as it might mess up the whole thing or is there an better/correct way of using layout?

[ChrisW67]

You should look at QStackedWidget as a way to handle several layers of widgets that you can switch between.

[wysota]

Have a look at this article: [wiki]The Panel Stack Pattern[/wiki]

[kalgorithmist]

This may look crazy, but it works. Consider this code in the constructor of the form:

int newX = QApplication::desktop ()->width () / 2;
 
newX -= this->width () / 2;
 
this->setGeometry (newX, 0, this->width (), this->height ());

int newX = QApplication::desktop ()->width () / 2;

newX -= this->width () / 2;

this->setGeometry (newX, 0, this->width (), this->height ());

To copy to clipboard, switch view to plain text mode 

In Line 1: QApplication::desktop ()->width () gets the maximum width of the current monitor where the app is

Do not forget to #include <QDesktopWidget> and #include <QApplication> .

[ChrisW67]

Sure, this will place "this" in the middle of the desktop.

That, however, is not what I understand premroxx was asking for. Premroxx has maximised "this" and the numerous, absolutely placed contents of "this" are not being placed as expected. The problem would also manifest if premroxx resized the window without maximising it. Premroxx has also tried to mimic a variable interface by overlaying widgets and manually controlling their individual visibility; a very VB6 way of going about the whole exercise.

[kalgorithmist]

Silly me . In this case, I think he wants what a QGridLayout does.

[premroxx]

I tried the form layout. In the 'Object inspector' i right click the 'MainWindow' then layout->layout in a form layout. I dragged the red margin, so that it covers the form. Then in the layoutformalignment i changed to alignHcentre,AlignVcentre. Still it seems to aligned towards left side. What am i doing wrong here?

[ChrisW67]

QFormLayout is designed to arrange labels and associated data entry widgets in two columns with convenience features related to setting widget buddies. You probably have you content widget in the left column. I would suggest that you look at a QHBoxLayout with the various alignment values.