For anyone looking into implementing this, this would probably be an abstraction over the trigger mechanism for bringing up a stationary menu, i.e. a menu created at some other element (represented by response):

Lines 284 to 308 in 2d2022f

    
           if (response.clicked() && root.is_menu_open(id)) || input.key_pressed(Key::Escape) { 
        
               // menu open and button clicked or esc pressed 
        
               return MenuResponse::Close; 
        
           } else if (response.clicked() && !root.is_menu_open(id)) 
        
               || (response.hovered() && root.is_some()) 
        
           { 
        
               // menu not open and button clicked 
        
               // or button hovered while other menu is open 
        
               let pos = response.rect.left_bottom(); 
        
               return MenuResponse::Create(pos, id); 
        
           } else if input.pointer.any_pressed() && input.pointer.primary_down() { 
        
               if let Some(pos) = input.pointer.interact_pos() { 
        
                   if let Some(root) = root.inner.as_mut() { 
        
                       if root.id == id { 
        
                           // pressed somewhere while this menu is open 
        
                           let menu_state = root.menu_state.read(); 
        
                           let in_menu = menu_state.area_contains(pos); 
        
                           if !in_menu { 
        
                               return MenuResponse::Close; 
        
                           } 
        
                       } 
        
                   } 
        
               } 
        
           } 
        
           MenuResponse::Stay

you can see that a menu is already opened by hovering if another menu is open already (L288).

the menu doesn't really have a mechanism for configuring it yet, but I suppose this could be easily added with some enums and a MenuConfig struct or something like that. Would be great if all these behaviours could be configured.

	if (response.clicked() && root.is_menu_open(id)) \|\| input.key_pressed(Key::Escape) {
	// menu open and button clicked or esc pressed
	return MenuResponse::Close;
	} else if (response.clicked() && !root.is_menu_open(id))
	\|\| (response.hovered() && root.is_some())
	{
	// menu not open and button clicked
	// or button hovered while other menu is open
	let pos = response.rect.left_bottom();
	return MenuResponse::Create(pos, id);
	} else if input.pointer.any_pressed() && input.pointer.primary_down() {
	if let Some(pos) = input.pointer.interact_pos() {
	if let Some(root) = root.inner.as_mut() {
	if root.id == id {
	// pressed somewhere while this menu is open
	let menu_state = root.menu_state.read();
	let in_menu = menu_state.area_contains(pos);
	if !in_menu {
	return MenuResponse::Close;
	}
	}
	}
	}
	}
	MenuResponse::Stay

Context menu on hover / clickable tooltips #1010

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