1704883 - In native context menus, report the mouse button which was used to click the menu item, to support a WebExtension API

Status: RESOLVED FIXED

(Core :: Widget: Cocoa, defect)

Description

[Markus Stange [:mstange]]

Our WebExtension menu items have the ability to detect the mouse button that a context menu item was clicked with: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus/OnClickData

This was added in bug 1469148 and is only supported in Firefox.

Do we want to support this capability on macOS with native menus? On macOS, having a menu item behave differently depending on what mouse button it was clicked with is very unexpected... but not impossible.

So I think we have two choices here:

• Choose not to support it (always report button 0) and disable the test browser_ext_menus_capture_secondary_click.js if native menus are used.
• Or implement support for it.

Thoughts?

Comment 1

[Rob Wu [:robwu]]

It should ideally be supported, for API consistency across platforms.

Do you have any idea about what it entails to support this functionality?

Test is being disabled (well, changed to fake events that does not match reality) for now in https://phabricator.services.mozilla.com/D111901

Comment 2

[Harry Twyford]

This is also used in the search context menu item, shown when in-content text is selected. A middle click does the search in a background tab. This is causing browser/components/search/test/browser/browser_contextmenu_whereToOpenLink.js to fail.

Comment 3

[Markus Stange [:mstange]]

(In reply to Rob Wu [:robwu] from comment #1)

It should ideally be supported, for API consistency across platforms.

Given that it is indeed possible, I can't really argue with that. It's just a bit weird / doesn't conform to macOS platform expectations. But I suppose the "safe" thing to do here is to keep existing functionality working and then have this discussion at some other point in the future.

Do you have any idea about what it entails to support this functionality?

It's not hard, the information is in NSApp.currentEvent.buttonNumber and we just need to forward it to the right place.

Comment 4

[Markus Stange [:mstange]]

Attachment: Bug 1704883 - Report which mouse button was used to click items in native menus. r=harry

Depends on D111980

Comment 5

[Markus Stange [:mstange]]

(In reply to Markus Stange [:mstange] from comment #3)

It's not hard, the information is in NSApp.currentEvent.buttonNumber and we just need to forward it to the right place.

It turns out there was a bit of a challenge here, because the current implementation in ext-menus.js gets the button from the click event, and we don't have a click event in native menus. I filed bug 1704948 to find a solution for this.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/4a2c06c74c5d
Report which mouse button was used to click items in native menus. r=harry

Comment 7

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/4a2c06c74c5d

Comment 8

[Pascal Chevrel:pascalc]

https://hg.mozilla.org/releases/mozilla-beta/rev/69294bd7afa7