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.