Single Qt Application With multiple windows/Widgets on two screens machine.

IamSumit2

Hi,
I am creating an application which shows two widgets. I want to show one screen on my first screen and another on second screen.I want to manage my widgets on both screens.

Thanks.

wrosecrans

Cool. Are you having some trouble with it that you'd like help with, or just kind of making an announcement?

Taz742

@IamSumit2 said in Single Qt Application With multiple windows/Widgets on two screens machine.:

I want to show one screen on my first screen

Sorry, screen is a monitor? You have two monitor and you want to show first widget in the first monitor and second widget to the second monitor?

Taz742

@IamSumit2
If your question is clear for me:

QDesktopWidget* m = QApplication::desktop();	
ScndMonitor *scndmon = new ScndMonitor(this); //Your widget, which you want to show second monitor.
connect(m, &QDesktopWidget::screenCountChanged, this, [=](int count) {
    if (count <= 1) {
        scndmon->deleteLater();
    }
}); //If second monitor shut downed delete this.

QRect desk_rect = m->screenGeometry(1); // it is a second monitor
int desk_x = desk_rect.width();
int desk_y = desk_rect.height();
int x = scndmon->width();
int y = scndmon->height();
scndmon->move(desk_x / 2 - x / 2 + desk_rect.left(), desk_y / 2 - y / 2 + desk_rect.top());
scndmon->showFullScreen();

http://doc.qt.io/archives/qt-4.8/qdesktopwidget.html

IamSumit2

@Taz742 said in Single Qt Application With multiple windows/Widgets on two screens machine.:

@IamSumit2 said in Single Qt Application With multiple windows/Widgets on two screens machine.:

I want to show one screen on my first screen

Sorry, screen is a monitor? You have two monitor and you want to show first widget in the first monitor and second widget to the second monitor?

Yes this was my Question.

Taz742

@IamSumit2
My answer was a very bad explanation.
Okay, start again.

We have 2 monitor, consider the case when an additional (second) monitor is on the right of the main monitor.

For example:

First monitor:

width: 1920
height: 1080

Second monitor:

width: 800
height: 600

The sum of both screens width is the sum 1920 + 800, i.e = 2720.

QRect desk_rect = m->screenGeometry(1); // it is a second monitor
int desk_x = desk_rect.width(); // i.e desk_x = 800
int desk_y = desk_rect.height(); // i.e desk_y = 600

We want to move our second widget to second monitor.

What does this code mean?

scndmon->move(desk_x / 2 - x / 2 + desk_rect.left(), desk_y / 2 - y / 2 + desk_rect.top());

scndmon is a widget which we want to show second monitor.
Just call scndmon->move(); And calculate coordinates.

desk_x / 2 = 800 / 2 = 400;
x is a our widget width. Let's assume that its width and height are 400x200. i.e x = 400 / 2 = 200.
desk_rect.left() is a first monitor width. i.e desk_rect_left() = 1920;

Now we only have a 'x' coordinate. Wich is 400 + 200 + 1920 = 2520; i.e x = 2520;

Now calculate 'y' coordinate.
desk_y / 2 = 600 / 2 = 300;
y is a our widget height. Wich height is 200. i.e y = 200 / 2 = 100.
desk_rect.top() = 0;
y = 300 + 100 = 400;

It turns out that our coordinates is 2520x400.
Our form will move(2520, 400), this is the coordinate in the center of the second monitor.
just call scndmon->showFullScreen();

Sorry for my bad english! :)

IamSumit2

It didn't work.It is displaying both widgets on same screen. I am getting screen count 2.

kshegunov

Get the screens from QGuiApplication and query their (available) geometry with QScreen::geometry.