Setting range on auto generated Int32Editor

Grids for WPF Forum

Posted 4 months ago by John Dunn
Version: 19.1.0687
Avatar

I have a data model that has a couple of ints, each of which have their own range. I'm setting DataObject to the model and have a custom TypeDescriptorFactory to generate the IPropertyModels. What would be the best way to set the range on the generated Int32Picker? I know I can validate the input after it's been entered but I think a better experience would be to limit the control range from the start.

Comments (3)

Answer - Posted 4 months ago by Actipro Software Support - Cleveland, OH, USA
Avatar

Hi John,

Int32PropertyEditor has Minimum and Maximum properties you can use that get applied to the edit box.  If you have fixed min/max values for a certain property, you can create an Int32PropertyEditor and add it to the PropertyGrid.PropertyEditors collection, using various type and name combinations to target it, like:

<gridseditors:Int32PropertyEditor PropertyName="Percentage" Minimum="0" Maximum="100" />

This topic describes the property editor matching procedure.

If instead the min/max can dynamically change, you'd have to make a custom property editor and use an Int32EditBox in its DataTemplate.  Then bind the Int32EditBox.Minimum and Maximum to appropriate values accessible via the IPropertyModel data context.


Actipro Software Support

Posted 4 months ago by John Dunn
Avatar

Thank you - that worked. It also looks likes it works adding PropertyEditors in C#. I tried an experiment and modified the range of the Int32PropertyEditor dynamically directly from code and it seemed to work to dynamically change the range without creating custom editor. Is this a bad idea?

Here's my test code

using ActiproSoftware.Windows;
using ActiproSoftware.Windows.Controls.Editors.Interop.Grids.PropertyEditors;
using ActiproSoftware.Windows.Controls.Grids.PropertyData;
using System.ComponentModel;
using System.Windows;

namespace WpfApp3
{
  /// <summary>
  /// Interaction logic for MainWindow.xaml
  /// </summary>
  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();

      var pe = new Int32PropertyEditor() { PropertyName = "Value", Minimum = 100, Maximum = 255 };
      theGrid.PropertyEditors.Add(pe);

      DataContext = new Data()
      {
        Test = pe,
        Name = "this is a name",
        Value = 234,
        Option = Options.No
      };
    }
  }

  public enum Options { Yes, No, Maybe };

  public class Data : ObservableObjectBase, IPropertyOwner
  {
    public Int32PropertyEditor Test { get; set; }

    [Category("General")]
    [DisplayName("A Name")]
    public  string Name { get; set; }
    [Category("General")]
    [DisplayName("Some Value")]
    public int Value { get; set; }


    Options option;
    [Category("General")]
    [DisplayName("Some Options")]
    public Options Option
    {
      get => option;
      set
      {
        if(option != value)
        {
          option = value;
          if (option == Options.Maybe) Test.Minimum = 0;
          else Test.Minimum = 50;
        }
      }
    }

    bool showIt;
    public bool ShowIt
    {
      get => showIt;
      set
      {
        if( showIt != value)
        {
          showIt = value;
          NotifyPropertyChanged("ShowIt");
          NotifyPropertyChanged("It");
        }
      }
    }

    int it;
    public int It
    {
      get => it;
      set
      {
        if( it != value)
        {
          it = value;
          this.NotifyPropertyChanged("It");
        }
      }
    }

    public bool GetPropertyVisibility(string name)
    {
      if (name == "It") return ShowIt;
      return true;
    }
  }

  interface IPropertyOwner
  {
    bool GetPropertyVisibility(string name);
  }

  public class CustomPropertyModel : PropertyDescriptorPropertyModel
  {
    public CustomPropertyModel(object target, PropertyDescriptor propertyDescriptor) : base(target, propertyDescriptor) { }
    public bool IsVisible
    {
      get
      {
        if (this.Target is IPropertyOwner owner) return owner.GetPropertyVisibility(this.Name);
        return true;
      }
    }
    bool updating = false;
    protected override void OnPropertyChanged(PropertyChangedEventArgs e)
    {
      // Call the base method
      base.OnPropertyChanged(e);
      if (!updating)
      {
        updating = true;
        this.NotifyPropertyChanged("IsVisible");
        updating = false;
      }
    }
  }

  public class CustomDataFactory : TypeDescriptorFactory
  {
    protected override IPropertyModel CreatePropertyModel(object target, PropertyDescriptor propertyDescriptor, IDataFactoryRequest request)
    {
      var prop =  new CustomPropertyModel(target, propertyDescriptor);
      return prop;
    }
  }
}
Posted 4 months ago by Actipro Software Support - Cleveland, OH, USA
Avatar

Hi John,

It should work programmatically as long as the property editor min/max values are set prior to the PropertyGrid data being loaded (i.e. via your DataContext).


Actipro Software Support

The latest build of this product (v21.1.3) was released 9 days ago, which was after the last post in this thread.

Add Comment

Please log in to a validated account to post comments.