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Document Preview

Overview​

The LMChatMessageDocumentPreview is a custom view class designed to display a preview of document attachments. It provides a visual representation of various document types, including file name, size, number of pages, and file type.

File Location:
LMChatMessageDocumentPreview.swift

Functionality​

Protocols​

LMChatMessageDocumentPreviewDelegate​

  • `onClickAttachment(_ url: String): triggered when the document is tapped on.

UI Components​

  • outerStackView: A vertical LMStackView that contains all other UI elements.
  • previewImage: An LMImageView for displaying a preview image of the document (currently unused).
  • containerView: An LMView that holds the document icon and details.
  • innerStackView: A vertical LMStackView for organizing document details.
  • sampleImage: An LMImageView displaying the document type icon.
  • titleLabel: An LMLabel showing the document's file name.
  • subtitleLabel: An LMLabel displaying additional document details (pages, size, type).

Properties​

  • delegate: A weak reference to an object conforming to LMChatMessageDocumentPreviewDelegate.
  • viewData: Stores the ContentModel data used to populate the view.

Methods​

  • setupViews(): Configures the initial view hierarchy and appearance.
  • setupLayouts(): Sets up auto layout constraints for the UI components.
  • setData(_:): Populates the view with data from a ContentModel.
  • onAttachmentClicked(_:): Handles tap gestures on the document preview.

Customization​

CustomDocumentPreview.swift
class CustomDocumentPreview: LMChatMessageDocumentPreview {
    override func setupViews() {
        super.setupViews()
        // Add custom views or modify existing ones
    }

    override func setData(_ data: ContentModel) {
        super.setData(data)
        // Customize how data is displayed
    }

    override func onAttachmentClicked(_ gesture: UITapGestureRecognizer) {
        super.onAttachmentClicked(gesture)
        // Add custom behavior when the attachment is clicked
    }
}
AppDelegate.swift
func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
    LMUIComponents.shared.messageDocumentPreview = CustomDocumentPreview.self
    // ...
    return true
}