Xojo dictionary3/26/2023 ![]() ![]() Now is time to create a new class that will play the role of the main Dictionary for the app of this Tutorial. Simple, isn’t? Remember that Class Interfaces just deal with Method definitions, and the classes that conform to it will be responsible for implementing the code for the methods. That’s all we need for our Class Interface. This will be the invoked method in order to find and return a word suggested for the received string. ![]() Add a second Method, name it ‘Match’, type ‘Value As String’ in the Parameters field, and ‘String’ for the ‘Return Type’ field.The first of the methods will be in charge of adding a new word to the dictionary, so use ‘AddWordToDictionary’ as the Method Name, and type ‘Value As String’ in the Parameters field.This action will bring us to the Inspector, so we can define the new Method signature. Select the icon for the ‘TextAutocompleteSource’ in the Navigator (the leftmost column in the IDE Window), open the contextual menu and choose the ‘Add to “TextAutocompleteSource” > Method’ option.This one will be the Data Type for the created Class Interface. Write ‘TextAutocompleteSource” in the Name field of the Inspector.Add a new Class Interface to the project selecting Insert > Class Interface.In fact let’s start creating a Class Interface so run the Xojo IDE and create a new Desktop project. Note: The Dictionary referred to here is not the Xojo Dictionary class, but is our collection of suggested words for use by autocomplete. This way, you’ll be able to use any object as the Dictionary source, as long as it conforms to the expected Class Interface. Our Xojo project will use three main items: a subclass from the TextField class, a Class Interface definition, and a Class that will do the job of the Dictionary containing the suggested words for the Autocomplete feature and that will conform to the Class Interface. Let’s see how we can implement it, using language features like Subclassing and Class Interface, among others! Creating the Class Interface Wouldn’t it be nice to have a TextField with Autocomplete for Xojo Apps, like we are used to in the Xojo IDE? You know, you start to type a word and the autocomplete feature suggests a possible matching word and finally you just have to press the ‘Tab’ key in order to complete the writing of the word. ![]()
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