Re: What is the correct way to response to the wxEVT_DPI_CHANGED event?

Hi,

Using 0 as the window parameter will indeed cause it to use the DPI of 
the main display.
I think I couldn't reproduce because I moved FromDIP(wxSize(250,50)); 
(without the 0) to a separate line so I could debug the return values.

You are allowed to call FromDIP/ToDIP with a nullptr window, wxWidgets 
internally does it too.
So I'm not sure if something like wxLogDebug("Determining DPI without a 
valid wxWindow"); can be added.

Maarten

On 1 Apr 2023 15:52, AsmWarrior wrote:
> Hi, Vadim Zeitlin and Maarten Bent. I think I found a mistake.
>
> In my test code, it has such line:
>
> sizer->Add(new wxButton(page, wxID_ANY, _T("Hello World"), 
> wxDefaultPosition, wxWindow::FromDIP(wxSize(250,50), 0)));
>
> Which is totally wrong here, because I have used the wrong argument 
> for the FromDIP( wxSize(250,50), 0 ), the second argument 0 is totally 
> wrong.
>
> Now, I have removed the second argument, and the result is: when I 
> click the ResetMode button, I don't have the reduced button size. 
> (Which shows in the third screen shot of the forum post here:
> How does the FromDIP function work under different DPI scaling? - 
> wxWidgets Discussion Forum — 
> https://forums.wxwidgets.org/viewtopic.php?f=1&t=50267)
>
> I'm sorry about that, I think it was a copy and paste error. Also, 
> when we pass the second 0 argument, can the function report something, 
> because it will call a function below:
>
> static wxSize wxWindow::FromDIP ( const wxSize & sz,
> const wxWindow * w
> )
> Where the w pointer is 0.
> Asmwarrior
>
>
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