Add ability to intercept / veto window close

[seanpringle]

Is there a way to turn off the "Quit" option added to the gl driver's first main-menu menu?

fyne/internal/driver/gl/menu.go

Line 33 in 0f43af5

if menu.Items[len(menu.Items)-1].Label != "Quit" { // make sure the first menu always has a quit option

Alternatively, a way to:

• change the label to allow for language localisation
• specify a custom action function (confirmation, unsaved work dialog, etc)

[andydotxyz]

This is a slightly complicated area because macOS, other desktop and mobile devices all handle it differently.

Yes we should support localisation, that needs to be done correctly for the whole framework, however.

There is currently an OnClosed handler on Window that may help - but it seems like what you want is something to fire before closing that determines whether or not it should be allowed? (Is they correct?)

I suspect that configuring the quit menu is not the right approach because the window could be manually closed as well and that should probably trigger the same event..?

[seanpringle]

There is currently an OnClosed handler on Window that may help - but it seems like what you want is something to fire before closing that determines whether or not it should be allowed? (Is they correct?)

Correct.

I suspect that configuring the quit menu is not the right approach because the window could be manually closed as well and that should probably trigger the same event..?

That sounds logical. Maybe even a general purpose interface for hooking onto window management events?

[andydotxyz]

I don’t know if we can really extend it that far as the events vary significantly across platforms. We can certainly add an abstraction where such support makes sense. Starting with WillClose to complement OnClose perhaps? (Unless anyone suggests a better name)

[seanpringle]

WillClose sounds great.

[andydotxyz]

This was completed a while back :)