Using a custom app in a choose dialog

On this page we show how to use the Flickr browser app within a component template to add a Flickr image to a page.

The content focuses on the flickr-image-simple component and assumes that you already know how to create templates.

The component dialog uses a Link field which opens a choose dialog. The choose dialog exposes the Flickr browser in which you can select the image.

The flickr-templates module provides a page template named flickr-example-page, which contains an area that makes the flickr-image-simple component available.

flickr-image-simple component template

Template definition

A template definition gives the component a name and makes it available to the system.

Component template definition:

flickr-templates/templates/components/flickr-image-simple.yaml

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Node name	Value
templates
components
flickr-image-simple
dialog	flickr-templates:components/flickr-image-simple
modelClass	info.magnolia.flickr.templates.templates.components.FlickrImageSimpleModel
renderType	freemarker
templateScript	/flickr-templates/templates/components/flickr-image-simple.ftl
title	Flickr simple image
visible	true

Dialog definition

A Dialog definition defines the edible content properties of a template.

All we want to store is a reference to Flickr picture. We use one Link field which allows you to choose the picture from the Flickr browser content app.

Component dialog definition:

flickr-templates/dialogs/components/flickr-image-simple.yaml

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Node name	Value
dialogs
components
flickr-image-simple
actions
extends	/flickr-templates/dialogs/common/common-actions
form
tabs
tabMain
fields
flickrPictureId
contentPreviewDefinition
contentPreviewClass	info.magnolia.flickr.browser.app.field.FlickrItemPreviewComponent
appName	flickr-browser
class	info.magnolia.ui.form.field.definition.LinkFieldDefinition
label	Flickr pic

Note:

Line 7: The field uses the LinkFieldDefinition for the class.
Line 9: It references flickr-browser in the appName.
Line 10, 11: It uses a custom contentPreviewDefinition. We will have a look at the contentPreviewClass
$webResourceManager.requireResource("info.magnolia.sys.confluence.artifact-info-plugin:javadoc-resource-macro-resources") FlickrItemPreviewComponent
later.

The dialog will store the the Flickr picture id in the JCR property flickrPictureId. Once you have created a page and added a flickr-image-simple component, use the JCR Browser app to see the saved value.

Template script

Here is the relevant freemarker script which renders the image.

flickr-templates/templates/components/flickr-image-simple.ftl

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Note: The template uses a Model class.

Model class

A Model class is a JavaBean to add business logic or to to retrieve data from any source.

We use the model to load another Java bean which represents the Flickr picture. The model exposes this "photo bean" as a bean property.Note:

The type of the bean property photo is com.flickr4java.flickr.photos.Photo (which is provided by the 3rd party library Flickr4java).
Line 56: The model injects FlickrService.
Line 61: Photo can be retrieved with FlickrService and the flickrPictureId which is stored on the content of the component.

Custom content preview component

A content preview component renders a preview of the selected photo in the choose dialog.

The preview component typically displays an image thumbnail and some metadata.

Here we create a FlickrItemPreviewComponent which displays a thumbnail and photo title.To build the custom preview component extend AbstractContentPreviewComponent:

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