ProGuide Combo boxes - Esri/arcgis-pro-sdk GitHub Wiki

internal class LabelClassExpressionComboBox : ArcGIS.Desktop.Framework.Contracts.ComboBox
{
   public LabelClassExpressionComboBox ()
   {
      // TODO : add code here to dynamically populate the combobox
   }
}

internal class MyComboBox : ArcGIS.Desktop.Framework.Contracts.ComboBox
{
   public MyComboBox()
   {
      this.Add(new ComboBoxItem("Item1"));
      this.Add(new ComboBoxItem("Item2"));
      this.Add(new ComboBoxItem("Item3"));
      this.Add(new ComboBoxItem("Item4"));
      this.Add(new ComboBoxItem("Item5"));
   }
}

internal class MyComboBox : ArcGIS.Desktop.Framework.Contracts.ComboBox
{
   public MyComboBox()
   {
      this.Add(new ComboBoxItem("Item1"));
      this.Add(new ComboBoxItem("Item2"));
      this.Add(new ComboBoxItem("Item3"));
      this.Add(new ComboBoxItem("Item4"));
      this.Add(new ComboBoxItem("Item5"));
   }

   protected override void OnSelectionChange(ComboBoxItem item)
   {
      // TODO - add specific custom code here
   }
}

//custom color item shown in the combo
internal class ColorItem {
    private Color _color = System.Windows.Media.Colors.Black;
    private SolidColorBrush _brush = null;
    private string _name = "";

    public ColorItem(Color color) {
      Initialize(color);
    }

    private void Initialize(Color color) {
      _color = color;
      _name = NameFromColor(_color);
      _brush = new SolidColorBrush(_color);
    }

    #region Properties

    public string Name => _name;

    public SolidColorBrush Brush => _brush;

    public Color Color => _color;

    #endregion

    internal string NameFromColor(Color col) {
      PropertyInfo colorProperty = typeof(System.Windows.Media.Colors).GetProperties()
        .FirstOrDefault(p => Color.AreClose((Color)p.GetValue(null), col));
      return colorProperty != null ? colorProperty.Name : "";
    }
  }

//initialize the list of available colors for the picker (in the module in this case)...
internal class Module1 : Module {
  private List<ColorItem> _colorList = new List<ColorItem>();
  private ColorItem _colorItem = null;
  ...

  protected override bool Initialize() {
	_colorList = new List<ColorItem>();
	_colorList.Add(new ColorItem(Colors.Red));
	_colorList.Add(new ColorItem(Colors.Green));
	_colorList.Add(new ColorItem(Colors.Blue));
	_colorList.Add(new ColorItem(Colors.Orange));
	_colorList.Add(new ColorItem(Colors.Yellow));
	_colorList.Add(new ColorItem(Colors.Purple));
	return true;
  }

  public List<ColorItem> ColorList => _colorList;

  public ColorItem SelectedColorItem {
   get {
     return _colorItem;
   }
   set {
     _colorItem = value;
   }
 }
 ...

//populate the combo box with the custom color items
//and handle the combo box item selection
internal class PickAColorCombo : ComboBox {
  private bool _isInitialized;

  public PickAColorCombo() {
    UpdateCombo();
  }

  private void UpdateCombo() {
    //populate the combobox with your desired items  
    if (_isInitialized)
      SelectedItem = ItemCollection.FirstOrDefault();

    if (!_isInitialized) {
      Clear();

     //Add the custom color items to the combobox
     foreach(var colorItem in Module1.Current.ColorList) {
       Add(colorItem);
     }
     _isInitialized = true;
    }

    Enabled = true; //enables the ComboBox
    SelectedItem = ItemCollection.FirstOrDefault();
  }

  protected override void OnSelectionChange(object item) {
    if (item == null) return;

    //handle the color item selection
    Module1.Current.SelectedColorItem = (ColorItem)item;
  }
}