Set browser screen resolution

[oleksiivasylenko]

SETUP: windows 10, c#, winforms app. Net 4.7.2

I am trying to set browser screen resolution.
I've tried to change Size property of browser as well as the size of browser(control size).
Tried to set maxWidth of winform and tried to set via cef settings
chromeSettings.CefCommandLineArgs.Add("window-size", "800,600");
or
chromeSettings.CefCommandLineArgs.Add("window-height", "800");
and nothing helped, I always see my resolution which was before settings.
To check resolution I used website.

If somebody knows how to do it, I will be really tanksful!

[amaitland]

Are you trying to emulate a different screen resolution?

You should be able to do that using DevTools

https://chromedevtools.github.io/devtools-protocol/tot/Emulation/#method-setDeviceMetricsOverride

You can directly use DevTools protocol see #3165
http://cefsharp.github.io/api/88.2.x/html/M_CefSharp_DevTools_Emulation_EmulationClient_SetDeviceMetricsOverrideAsync.htm

[amaitland]

Could you please clarify why set resolution, works only when I set mobile to true?

I've never used Emulation.setDeviceMetricsOverride before, the API is generated programatically, I've only used a small portion of it. Looks like the parameters are being passed correctly.

[amaitland]

Does the change require a reload or navigation to take effect?

[oleksiivasylenko]

yes for me to change the resolution I did navigation to "google" and then back, perhaps reloading are also works but I haven't tried it.

[oleksiivasylenko]

Could you please clarify why set resolution, works only when I set mobile to true?

I've never used Emulation.setDeviceMetricsOverride before, the API is generated programatically, I've only used a small portion of it. Looks like the parameters are being passed correctly.

Maybe it's chrome related settings(things), but I think it should set the resolution without affecting isMobile property

[amaitland]

You've only passed in values for the width and height, you haven't specified the screenWidth or screenHeight parameters. Looking at the source and the defaults are different for desktop and mobile.

https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/core/frame/screen_metrics_emulator.cc;l=60;drc=184bf7b03160ebf2217ab4711118d013a750908a