Customize Attachment Preview URL #1210
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Related to [basecamp#1154][] First, document the existing Attachment previewing process, including _which_ content types are supported out of the box. Next, resolve some `ManagedAttachment` to `Attachment` proxying issues. The `ManagedAttachment` class is what gets dispatched as part of `trix-attachment-add` events. It does not inherit from `Attachment`, but instead proxies method calls and property access. Prior to this commit, there were some proxy definition gaps. For example, the `ManagedAttachment` [declares a proxy for the `setAttribute` method][setAttribute]. Unfortunately, an `Attachment.setAttribute` method did not exist prior to these changes. This commit remedies that. Next, this commit adds proxy definitions for `Attachment.setPreviewURL` and `Attachment.getPreviewURL` so that event handlers can customize the value from the event-level `ManagedAttachment` instance, without deeply reaching into the `Attachment` instance (via `event.attachment.attachment`). [basecamp#1154]: basecamp#1154 [setAttribute]: https://github.com/basecamp/trix/blob/5db0ea49180de97f27b0becf47440690a1eaa39c/src/trix/models/managed_attachment.js#L22
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Related to #1154
First, document the existing Attachment previewing process, including which content types are supported out of the box.
Next, resolve some
ManagedAttachmenttoAttachmentproxying issues. TheManagedAttachmentclass is what gets dispatched as part oftrix-attachment-addevents. It does not inherit fromAttachment, but instead proxies method calls and property access. Prior to this commit, there were some proxy definition gaps.For example, the
ManagedAttachmentdeclares a proxy for thesetAttributemethod. Unfortunately, anAttachment.setAttributemethod did not exist prior to these changes. This commit remedies that.Next, this commit adds proxy definitions for
Attachment.setPreviewURLandAttachment.getPreviewURLso that event handlers can customize the value from the event-levelManagedAttachmentinstance, without deeply reaching into theAttachmentinstance (viaevent.attachment.attachment).