public static LayerDisplayItem Create(int layerId, string layerTitle)
{
LayerDisplayItem result = LayerDisplayItem.Empty;
result.LayerId = layerId;
result.LayerTitle = layerTitle;
return(result);
}
/// <override></override>
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if (context != null && context.Instance != null && provider != null)
{
IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
if (edSvc != null && context.Instance is Shape)
{
Shape shape = (Shape)context.Instance;
using (CheckedListBox listBox = new CheckedListBox()) {
bool isHomeLayerProperty = (context.PropertyDescriptor.Name == "HomeLayer");
listBox.BorderStyle = BorderStyle.None;
listBox.IntegralHeight = false;
listBox.CheckOnClick = true;
listBox.SelectionMode = SelectionMode.One;
if (isHomeLayerProperty)
{
listBox.SelectedIndexChanged += (sender, e) => {
int idx = listBox.SelectedIndex;
for (int i = listBox.Items.Count - 1; i >= 0; --i)
{
if (i != idx && listBox.GetItemChecked(i))
{
listBox.SetItemChecked(i, false);
}
}
};
}
// Add existing layers and check shape's layers
listBox.Items.Clear();
foreach (Layer l in shape.Diagram.Layers)
{
int idx = listBox.Items.Count;
// Add layer item
if (Layer.IsCombinable(l.LayerId) || isHomeLayerProperty)
{
listBox.Items.Insert(idx, LayerDisplayItem.Create(l.LayerId, l.Name));
// Set check state
if (isHomeLayerProperty)
{
listBox.SetItemChecked(idx, shape.HomeLayer == l.LayerId);
}
else
{
listBox.SetItemChecked(idx, (shape.SupplementalLayers & Layer.ConvertToLayerIds(l.LayerId)) != 0);
}
}
}
edSvc.DropDownControl(listBox);
// Get selected layer ids
List <int> shapeLayerIds = new List <int>();
foreach (LayerDisplayItem layerItem in listBox.CheckedItems)
{
shapeLayerIds.Add(layerItem.LayerId);
}
// Set property value
if (isHomeLayerProperty)
{
System.Diagnostics.Debug.Assert(shapeLayerIds.Count <= 1);
value = (shapeLayerIds.Count > 0) ? shapeLayerIds[0] : Layer.NoLayerId;
}
else
{
value = Layer.ConvertToLayerIds(shapeLayerIds);
}
}
}
}
return(value);
}
