/// <inheritdoc />
/// <returns>A comma-separated list of recognized syntax filter IDs</returns>
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
if (value is string)
{
string filterIds = value.ToString();
var allFilters = BuildComponentManager.SyntaxFiltersFrom("All");
var definedFilters = BuildComponentManager.SyntaxFiltersFrom(filterIds);
// Convert to None, All, AllButUsage, or Standard? If not,
// then convert to the list of defined filters that we know
// about.
if (definedFilters.Count == 0)
{
filterIds = "None";
}
else
if (definedFilters.Count == allFilters.Count)
{
filterIds = "All";
}
else
if (definedFilters.Count == allFilters.Count(
af => af.Id.IndexOf("usage", StringComparison.OrdinalIgnoreCase) == -1))
{
filterIds = "AllButUsage";
}
else
if (definedFilters.Count == 3 && (definedFilters.All(df => df.Id == "CSharp" ||
df.Id == "VisualBasic" || df.Id == "CPlusPlus")))
{
filterIds = "Standard";
}
else
{
filterIds = String.Join(", ", definedFilters.Select(f => f.Id).ToArray());
}
return(filterIds);
}
return(base.ConvertFrom(context, culture, value));
}
public override object EditValue(System.ComponentModel.ITypeDescriptorContext context,
IServiceProvider provider, object value)
{
Collection <SyntaxFilterInfo> allFilters, definedFilters;
IWindowsFormsEditorService editorService;
CheckedListBox ckbListBox;
string filterIds;
// Only use the editor if we have a valid context
if (context == null || provider == null || context.Instance == null ||
value == null)
{
return(base.EditValue(context, provider, value));
}
editorService = (IWindowsFormsEditorService)provider.GetService(
typeof(IWindowsFormsEditorService));
if (editorService == null)
{
return(base.EditValue(context, provider, value));
}
allFilters = BuildComponentManager.SyntaxFiltersFrom("All");
definedFilters = BuildComponentManager.SyntaxFiltersFrom(value.ToString());
using (ckbListBox = new CheckedListBox())
{
ckbListBox.BorderStyle = BorderStyle.None;
ckbListBox.CheckOnClick = true;
// Tahoma 8pt prevents it from clipping the bottom of each item
ckbListBox.Font = new Font("Tahoma", 8.0f);
// Load the values into the checked list box
foreach (SyntaxFilterInfo info in allFilters)
{
ckbListBox.Items.Add(info.Id, definedFilters.Contains(info));
}
// Adjust the height of the list box to show all items or
// at most twelve of them.
if (ckbListBox.Items.Count < 12)
{
ckbListBox.Height = ckbListBox.Items.Count *
ckbListBox.ItemHeight;
}
else
{
ckbListBox.Height = ckbListBox.Items.Count * 12;
}
// Display it and let the user edit the value
editorService.DropDownControl(ckbListBox);
// Get the selected syntax filter ID values and return them
// as a comma-separated string. This also checks for common
// short-hand values and uses them if appropriate.
if (ckbListBox.CheckedItems.Count == 0)
{
value = "None";
}
else
{
filterIds = String.Join(", ", ckbListBox.CheckedItems.Cast <string>().ToArray());
definedFilters = BuildComponentManager.SyntaxFiltersFrom(filterIds);
// Convert to All, AllButUsage, or Standard?
if (definedFilters.Count == allFilters.Count)
{
filterIds = "All";
}
else
if (definedFilters.Count == allFilters.Count(
af => af.Id.IndexOf("usage", StringComparison.OrdinalIgnoreCase) == -1))
{
filterIds = "AllButUsage";
}
else
if (definedFilters.Count == 3 && (definedFilters.All(f => f.Id == "CSharp" ||
f.Id == "VisualBasic" || f.Id == "CPlusPlus")))
{
filterIds = "Standard";
}
value = filterIds;
}
}
return(value);
}