Multiple Media Picker not available as macro parameter

[Tobelemo]

The Partial View Macro File snippet "Gallery" recommends the use of the property editor "Multiple Media Picker".
This property editor is not available as an option in the "Editor" dropdownlist when adding parameters to a macro.

[kjac]

... disregard my last comment 😊

[nul800sebastiaan]

Yeah, that seems like an oversight! The media picker can be configured as a multiple media picker as well, but I'm not sure how we'd do that for a macro parameter editor. 🤔

[kjac]

I had a stab at it really quick the other day but since the multinode treepicker doubles as multiple content picker for macros, there is no easy fix for this. The required fix sadly involves a new dedicated value converter for a new macro parameter property type.

[AlphaDelta]

I've had success with the following:

Result:

I am however unaware of the full implications of extending MediaPickerConfigurationEditor and overriding DefaultConfigurationObject, negative or otherwise.

It appeared fairly safe to me by the fact that it's simply DefaultConfigurationObject => new T(); if it wasn't overridden; https://github.com/umbraco/Umbraco-CMS/blob/v8/dev/src/Umbraco.Core/PropertyEditors/ConfigurationEditorOfTConfiguration.cs#L100

Edit: "Umbraco.MultipleMediaPicker" should be used for the alias of the property editor as that's what it was in v7 (ref), my mistake.

[nul800sebastiaan]

PR to fix this: #6149