Request: Dropdown example

[Rainer Bernhardt]

Can you maybe create an example how to use dropdown list with databinding.

The problem is, I would like to set the available options via binding, the current option and update the data context when a option was changed.

Thank you

[Christian Oeing]

Hey Rainer! Did you have a look at the EnumEqualityCheck example? It uses a drop down list to choose from the enum values. Maybe that already helps?

[Rainer Bernhardt]

I did, but this is a custom implementation of a dropdown list. So there is no way to bind the normal unity dropdown component?

[Christian Oeing]

Ah, I see. There is no setter for the option data yet, but I started to put together an example for the next release.

In the mean time you can use this setter:

namespace Slash.Unity.DataBind.UI.Unity.Setters
{
    using System.Collections.Generic;

    using Slash.Unity.DataBind.Foundation.Setters;

    using UnityEngine;
    using UnityEngine.UI;

    /// <summary>
    ///   Set the options of a dropdown element to the provided list of option data items.
    /// </summary>
    [AddComponentMenu("Data Bind/UnityUI/Setters/[DB] Dropdown Options Setter (Unity)")]
    public class DropdownOptionsSetter : ComponentSingleSetter<Dropdown, IEnumerable<Dropdown.OptionData>>
    {
        /// <inheritdoc />
        protected override void UpdateTargetValue(Dropdown target, IEnumerable<Dropdown.OptionData> value)
        {
            target.ClearOptions();
            if (value != null)
            {
                target.AddOptions(new List<Dropdown.OptionData>(value));
            }
        }
    }
}

You still need to provide a list or collection of Dropdown.OptionData (see below) in the context, but I will try to provide a data converter for lists in the next release. Hope that helps :)

        private readonly Property<Collection<Dropdown.OptionData>> optionDataListProperty
            =
            new Property<Collection<Dropdown.OptionData>>(
                new Collection<Dropdown.OptionData>());

        public Collection<Dropdown.OptionData> OptionDataList
        {
            get
            {
                return this.optionDataListProperty.Value;
            }
            set
            {
                this.optionDataListProperty.Value = value;
            }
        }

[Christian Oeing]

I added an example to use Data Bind with a Unity UI dropdown. It will be released with the next version (1.0.9)

Furthermore there will be a generic way to convert the items of a collection to a different type (e.g. Dropdown.OptionData), so you are not forced to use Dropdown.OptionData in your data context.

[Rainer Bernhardt]

Thank you very much

[Christian Oeing]

Removing milestone: 1.0.9 (automated comment)