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Added Context::is_context_menu_open() (#3267)

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I encountered a case where I needed to know if an egui context menu was
open, even if the mouse cursor was not in an egui area (full details in
discord).  I found that every resource I needed to detect that the menu
was open was either private, or pub(crate).  While it is possible to
wrap the `Response::context_menu()` in code to do state-tracking, it
becomes necessary to duplicate that code in every place you use a
context menu.

In this commit, I add `Context::is_context_menu_open()`.  Named similarly
to `Context::is_pointer_over_area()`, this method will return true if
any context menu is open.  This is possible because the context menu
uses a temp var with a fixed Id to store its state.  This method just
fetches the state, and interrogates it to see if there is a menu
present.

One helper method, `BarState::has_root()`, was added as all the fields
needed to perform the check were private to the `menu` module.

I've also updated the Context Menu demo to show the result of
`is_context_menu_open()` to verify the code functions as expected.
This commit is contained in:
David M. Lary
2023-08-22 08:35:15 -05:00
committed by GitHub
parent 461328f54d
commit 32a63da580
3 changed files with 20 additions and 1 deletions
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5
crates/egui_demo_lib/src/demo/context_menu.rs
View File

@@ -66,6 +66,11 @@ impl super::View for ContextMenus {
ui.menu_button("Click for menu", Self::nested_menus);
ui.button("Right-click for menu")
.context_menu(Self::nested_menus);
if ui.ctx().is_context_menu_open() {
ui.label("Context menu is open");
} else {
ui.label("Context menu is closed");
}
});
ui.separator();