Test FullScreen on a different monitor

[Petricevic]

I have to develop a desktop program on Debian GNU / Linux bookworm / sid was a Debian 11 but I couldn't install xorg-dev for the library versions.
It has to be all in FullScreen. The user must never access anything except
the 6-key keypad, and see what the machine does.
The computer where I will install will have an 800x480 monitor
I am developing with a 1920x1080 laptop which will also be used for assistance.
How can I simulate this without having the monitor?
At the moment from the examples I have put together this working but very very dirty test.

package main
import (
	"time"
	"fmt"
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/driver/desktop"
	"fyne.io/fyne/v2/widget"
)

func updateTime(clock *widget.Label) {
	formatted := time.Now().Format("Time: 03:04:05")
	clock.SetText(formatted)
}

func main() {
	a := app.New()
	drv := fyne.CurrentApp().Driver()

    //Dirty, without a goes wrong but I don't use a
	fmt.Println("received", drv)
	fmt.Println("received", a)

	if drv, ok := drv.(desktop.Driver); ok {
		w := drv.CreateSplashWindow()
        // dirty, it does not appear, and it worries me a lot
		w.SetContent(widget.NewLabelWithStyle("Hello World!\n\nMake a splash!",
		fyne.TextAlignCenter, fyne.TextStyle{Bold: true}))

		clock := widget.NewLabel("")
		updateTime(clock)

		w.SetContent(clock)
		w.Resize(fyne.NewSize(800, 480))

		go func() {
			for range time.Tick(time.Second) {
				updateTime(clock)
			}
		}()
		w.ShowAndRun()
	}
}

Thanks in advance for any solution.

[jinzhongjia]

why don't use the function fullscreen?
and the 6-key keypad, means that there are only six keys on the keyboard or only six keys can be used?

[Petricevic]

I don't use w.SetFullScreen(true) because I can't understand how it will look on a smaller monitor. Will the user be able to read the instructions? Are the icons big enough?
The keyboard has only 6 keys.

[jinzhongjia]

Fyne's components are all vector scaling, so your concerns about different renderings should not arise

[jinzhongjia]

But I suggest you get it on an actual device and test it

[Jacalz]

The numerical entry tutorial might be interesting for the keypad: https://developer.fyne.io/extend/numerical-entry

[Jacalz]

Also, FYI, you can change the driver code above to this instead:

a := app.New()
drv := a.Driver()

[Petricevic]

Thank you! Works.

[Jacalz]

To simulate the screen size, you can set the window size w.Resize() to the same ratio as the other screen (not necessarily same size as the size isn't pixels). The scaling of Fyne should make it look basically the same.

If you want a better simulation, your best bet might be to force the screen resolution in the OS settings, if possible, to the same values.

[andydotxyz]

Resizing the window doesn't seem like a dirty test.
The alternative is to reconfigure your monitor to display the desired resolution for your app ok fullscreen.