dynamically loaded components cannot reference types

[doulos]

Resolving paths relative to the calling document prevents these problems.

well, I still am not convinced. In my non-plugin scenario, I had the components in a subdirectory. If I directly referenced the root component via directory import, it was found and all nested types as well. If I load the root component through a Loader, suddenly nested components are NOT found. Again:

main.qml
navigation
   Reusable.qml <-- uses Nested
   Nested.qml

main.qml
navigation
   Reusable.qml <-- uses Nested
   Nested.qml

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now, if in main.qml I simply do a directory import and use the Reusable type, everything works well:

import "navigation"
Rectangle {
   Reusable {
   }
}

import "navigation"
Rectangle {
   Reusable {
   }
}

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However, if I load Reusable dynamically

Rectanngle {
  Loader {
    source: "navigation/Reusable.qml"
  }
}

Rectanngle {
  Loader {
    source: "navigation/Reusable.qml"
  }
}

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I see an error message that file "navigation/Nested.qml" was not found. In a plugin scenario, the message simply says "Nested is not a type". If this makes sense somehow, it is still almost impossible IMO to find a smooth path from that message to a solution, which may mean that the concepts are not that clear and plausible, or at least not well explained. As I said, it took a day of desperate poking for me.

[wysota]

With the first approach you are effectively importing all types defined in "navigation" into the scope of the current document (in other words "navigation" becomes a sort of plugin that contains documents present in that directory). In the second approach you get regular path resolution. Whether this works or not, depends on the scope of the containing document (i.e. the location of the file containing the last snippet).

If you want to load "Reusable" from within main.qml, you will refer to "navigation/Reusable.qml" or "Reusable.qml" having imported "navigation" module. If you want to load "Reusable" from Nested.qml, you will have to refer to Reusable.qml directly.