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How to hide some enum value on some conditions?

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PropertyGrid
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Steve
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Steve asked on 05 Feb 2020, 01:13 PM

I have a class like,

        enum ConstraintType
            {
            Horizental,
            Vertial,
            Slope,
            Offset
            }

       class Constraint

{

ConstraintType First {get;set;}

ConstraintType Second {get;set;}

}

I know the enum will be dropdownlist on the propertygrid.

I hope the candidate enum values of Second is Slope and Offset when the First equals Vertical. 

I want to know how to display limited enum value in dropdownlist according to some other property.

Thanks.

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 07 Feb 2020, 12:56 PM
Hello, Steve,   

In order to control what items to the displayed in the drop down editor, it is necessary to handle the RadPropertyGrid.EditorInitialized event and hide the items considering the value of another field.

Please refer to the sample code snippet which result is illustrated in the attached gif file.
        public RadForm1()
        {
            InitializeComponent();

            Constraint c = new Constraint();
            c.First = ConstraintType.Vertial;
            c.Second = ConstraintType.Offset;
            this.radPropertyGrid1.SelectedObject = c;

            this.radPropertyGrid1.EditorInitialized += radPropertyGrid1_EditorInitialized;
        }

        private void radPropertyGrid1_EditorInitialized(object sender, PropertyGridItemEditorInitializedEventArgs e)
        {
            visible = ElementVisibility.Visible;
            isVisible = true;
            height = 20;
            PropertyGridDropDownListEditor editor = e.Editor as PropertyGridDropDownListEditor;
            if (editor != null)
            {
                BaseDropDownListEditorElement el = editor.EditorElement as BaseDropDownListEditorElement;
                el.SelectNextOnDoubleClick = false;
                el.DropDownSizingMode = SizingMode.RightBottom;
                Constraint c = this.radPropertyGrid1.SelectedObject as Constraint;
                el.VisualItemFormatting -= el_VisualItemFormatting;
                el.VisualItemFormatting += el_VisualItemFormatting;
                if (e.Item.Label == "Second")
                {
                    if (c.First == ConstraintType.Vertial)
                    {
                        visible = ElementVisibility.Collapsed;
                        isVisible = false;
                        height = 0;
                    }
                    el.SelectedIndex = GetIndexByValue(((PropertyGridItem)e.Item).Value, el.DataSource);
                }
            }
        }

        private int GetIndexByValue(object value, object dataSource)
        {
            List<string> items = dataSource as List<string>;
            for (int i = 0; i < items.Count; i++)
            {
                if (items[i].Equals(value.ToString()))
                {
                    return i;
                }
            }
            return -1;
        }

        public ElementVisibility visible;
        public bool isVisible;
        public int height;

        private void el_VisualItemFormatting(object sender, VisualItemFormattingEventArgs args)
        {
            if (!args.VisualItem.Text.Equals(ConstraintType.Slope.ToString()) &&
                !args.VisualItem.Text.Equals(ConstraintType.Offset.ToString()))
            {
                args.VisualItem.Visibility = visible;
                args.VisualItem.Enabled = isVisible;
                args.VisualItem.Data.Height = height;
            }
            else
            {
                args.VisualItem.Visibility = ElementVisibility.Visible;
                args.VisualItem.Enabled = true;
                args.VisualItem.Data.Height = 20;
            }
        }

        enum ConstraintType
        {
            Horizental,
            Vertial,
            Slope,
            Offset
        }

        class Constraint
        {
            public ConstraintType First { get; set; }

            public ConstraintType Second { get; set; }
        }
I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

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Dess | Tech Support Engineer, Principal
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