mirror of https://github.com/dahall/Vanara.git
135 lines
3.9 KiB
C#
135 lines
3.9 KiB
C#
using System;
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using System.ComponentModel;
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using System.Windows.Forms;
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using System.Drawing.Design;
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using System.Globalization;
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using System.Windows.Forms.Design;
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using Vanara.Extensions;
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namespace Vanara.Windows.Forms.Design
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{
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/// <summary>A <see cref="UITypeEditor"/> for editing flag enums.</summary>
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/// <typeparam name="TE">The type of the enum.</typeparam>
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/// <seealso cref="System.Drawing.Design.UITypeEditor"/>
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public class FlagEnumUIEditor<TE> : UITypeEditor where TE : struct, System.Enum
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{
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private readonly FlagCheckedListBox listBox;
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public FlagEnumUIEditor() { listBox = new FlagCheckedListBox {BorderStyle = BorderStyle.None}; }
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public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
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{
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if (context?.Instance != null && provider != null)
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{
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var edSvc = provider.GetService<IWindowsFormsEditorService>();
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if (edSvc == null) return null;
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var e = (TE)Convert.ChangeType(value, context.PropertyDescriptor.PropertyType);
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listBox.Value = e;
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edSvc.DropDownControl(listBox);
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return listBox.Value;
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}
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return null;
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}
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public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) => UITypeEditorEditStyle.DropDown;
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public class FlagCheckedListBox : CheckedListBox
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{
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private readonly Container components = null;
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private TE enumValue;
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private bool isUpdatingCheckStates;
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public FlagCheckedListBox() { CheckOnClick = true; }
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[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)]
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public TE Value
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{
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get
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{
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long sum = 0;
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for (var i = 0; i < Items.Count; i++)
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{
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var item = Items[i] as FlagCheckedListBoxItem;
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if (item != null && GetItemChecked(i))
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sum |= item.LongVal;
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}
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return FromLong(sum);
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}
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set
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{
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Items.Clear();
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enumValue = value;
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foreach (TE val in Enum.GetValues(typeof(TE)))
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Add(val);
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UpdateCheckedItems(enumValue);
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}
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}
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public void Add(TE v) => Items.Add(new FlagCheckedListBoxItem(v));
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private static TE FromLong(long val) => (TE)Enum.ToObject(typeof(TE), val);
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protected override void Dispose(bool disposing)
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{
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if (disposing)
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components?.Dispose();
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base.Dispose(disposing);
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}
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protected override void OnItemCheck(ItemCheckEventArgs e)
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{
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base.OnItemCheck(e);
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if (isUpdatingCheckStates) return;
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var item = Items[e.Index] as FlagCheckedListBoxItem;
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if (item != null) UpdateCheckedItems(item, e.NewValue);
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}
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protected void UpdateCheckedItems(TE value)
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{
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isUpdatingCheckStates = true;
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var lval = Convert.ToInt64(value);
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// Iterate over all items
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for (var i = 0; i < Items.Count; i++)
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{
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var item = Items[i] as FlagCheckedListBoxItem;
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if (item == null) continue;
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SetItemChecked(i, (item.LongVal == 0 && lval == 0) || value.IsFlagSet(item.Value));
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//SetItemChecked(i, item.Value == 0 ? value == 0 : (item.value & value) == item.value && item.value != 0);
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}
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isUpdatingCheckStates = false;
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}
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// Updates items in the CheckListBox
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// composite = The item that was checked/unchecked
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// cs = The check state of that item
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protected void UpdateCheckedItems(FlagCheckedListBoxItem composite, CheckState cs)
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{
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long sum = 0;
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if (composite.LongVal != 0)
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{
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sum = Convert.ToInt64(Value);
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// If the item has been unchecked, remove its bits from the sum
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if (cs == CheckState.Unchecked)
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sum = sum & ~composite.LongVal;
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// If the item has been checked, combine its bits with the sum
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else
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sum |= composite.LongVal;
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}
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UpdateCheckedItems(FromLong(sum));
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}
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// Represents an item in the CheckListBox
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public class FlagCheckedListBoxItem
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{
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public FlagCheckedListBoxItem(TE value) { Value = value; }
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public TE Value { get; }
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public long LongVal => Convert.ToInt64(Value);
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public override string ToString() => Value.ToString();
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}
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}
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}
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} |